WO2011159877A2 - Bi-specific antibodies against tim-3 and pd-1 for immunotherapy in chronic immune conditions - Google Patents

Bi-specific antibodies against tim-3 and pd-1 for immunotherapy in chronic immune conditions Download PDF

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WO2011159877A2
WO2011159877A2 PCT/US2011/040665 US2011040665W WO2011159877A2 WO 2011159877 A2 WO2011159877 A2 WO 2011159877A2 US 2011040665 W US2011040665 W US 2011040665W WO 2011159877 A2 WO2011159877 A2 WO 2011159877A2
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tim
cells
antibody
bispecific
polypeptide agent
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WO2011159877A3 (en
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Vijay K. Kuchroo
Ana C. Anderson
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Brigham and Womens Hospital Inc
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Brigham and Womens Hospital Inc
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Priority to US13/805,030 priority Critical patent/US9163087B2/en
Priority to CA2802344A priority patent/CA2802344C/en
Priority to JP2013515507A priority patent/JP2013532153A/ja
Publication of WO2011159877A2 publication Critical patent/WO2011159877A2/en
Publication of WO2011159877A3 publication Critical patent/WO2011159877A3/en
Anticipated expiration legal-status Critical
Priority to US14/857,402 priority patent/US9834607B2/en
Priority to US15/803,079 priority patent/US10934352B2/en
Priority to US17/165,120 priority patent/US20210332130A1/en
Priority to US19/063,451 priority patent/US20250223357A1/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2803—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/04—Antibacterial agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/10—Antimycotics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P33/00—Antiparasitic agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • A61P35/02—Antineoplastic agents specific for leukemia
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • A61P37/02—Immunomodulators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2803—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily
    • C07K16/2818—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily against CD28 or CD152
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2896—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against molecules with a "CD"-designation, not provided for elsewhere
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
    • A61K2039/507—Comprising a combination of two or more separate antibodies
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
    • C07K2317/31—Immunoglobulins specific features characterized by aspects of specificity or valency multispecific
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
    • C07K2317/73—Inducing cell death, e.g. apoptosis, necrosis or inhibition of cell proliferation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
    • C07K2317/76—Antagonist effect on antigen, e.g. neutralization or inhibition of binding

Definitions

  • the invention relates to compositions and methods for targeting PD-1 and Tim-3 in the treatment of chronic immune conditions.
  • Tim-3+ TILs tumor-infiltrating lymphocytes
  • PD-1 another inhibitory receptor
  • the inventors have found that these Tim- 3+PD-1+ TILs represent the predominant fraction of CD8+ T cells infiltrating tumors.
  • these Tim-3+PD-l+ TILs show the greatest functional exhaustion, as measured by a failure to proliferate, and produce the cytokines IL-2, TNFa and IFNy.
  • compositions comprising bispecific and multispecific polypeptide agents, and methods using these agents for targeting cells, such as functionally exhausted or unresponsive immune cells, that co-express the inhibitory receptors PD-1 and TIM-3.
  • These compositions and methods are useful for the treatment of chronic immune conditions, such as persistent infections or cancer, where an immune response, such as an antigen- specific cytotoxic CD8 cell response, is inhibited or reduced due to the combined expression and activity of the PD-1 and TIM-3 inhibitory receptors.
  • compositions and methods By blocking or inhibiting the interaction of these inhibitory receptors with their ligand, for example, by binding specifically to one or more ligand interaction sites, these compositions and methods prevent and/or inhibit PD-1 and TIM-3 inhibitory signals, and thus permit the restoration of or increase in the immune response.
  • multispecific polypeptide agents comprising at least one binding site that specifically binds to a PD-1 molecule, and at least one binding site that specifically binds to a TIM-3 molecule.
  • the multispecific polypeptide agent is a multispecific antibody or a multispecific antibody fragment thereof.
  • bispecific polypeptide agents comprising a binding site that specifically binds to a PD-1 molecule, and a binding site that specifically binds to a TIM-3 molecule.
  • the bispecific polypeptide agent is a bispecific antibody or a bispecific antibody fragment thereof.
  • 1 molecule comprises the sequence set forth in SEQ ID NO: l, or is an allelic or splice variant of SEQ ID NO: l.
  • TIM-3 molecule comprises the sequence set forth in SEQ ID NO:2, or is an allelic or splice variant of SEQ ID NO:2.
  • the binding site that specifically binds to the PD-1 molecule is directed against a PD-1 ligand interaction site.
  • specific binding to the PD-1 ligand interaction site modulates interaction of PD-1 with PD-L1.
  • specific binding to the PD-1 ligand interaction site modulates interaction of PD-1 with PD-L2.
  • specific binding to the PD-1 ligand interaction site modulates interaction of PD-1 with PD-L1 and PD-L2.
  • the ligand interaction site of PD-1 comprises amino acid residues 41-136 of SEQ ID NO: l. In some embodiments, the ligand interaction site of PD-1 consists essentially of amino acid residues 41-136 of SEQ ID NO: l. In some embodiments, the ligand interaction site on PD-1 comprises any of the amino acid residues selected from the group consisting of amino acids 64, 66, 68, 73, 74, 75, 76, 78, 90, 122, 124, 126, 128, 130, 131, 132, 134, and 136 of SEQ ID NO: l. In some embodiments, the ligand interaction site on PD-1 comprises any of the amino acid residues selected from the group consisting of amino acids 78, 126, and 136 of SEQ ID NO: l.
  • the binding site that specifically binds to the TIM-3 molecule is directed against a TIM-3 ligand interaction site.
  • binding to the TIM-3 ligand interaction site modulates interaction of TIM-3 with galectin-9.
  • specific binding to the TIM-3 ligand interaction site modulates interaction of TIM-3 with phosphatidylserine.
  • specific binding to the TIM-3 ligand interaction site modulates interaction of TIM-3 with galectin-9 and phosphatidylserine.
  • compositions comprising the multispecific or bispecific polypeptide agents comprising at least one binding site that specifically binds to a PD-1 molecule, and at least one binding site that specifically binds to a TIM-3 molecule as described herein, and a pharmaceutically acceptable carrier.
  • methods of treating subjects having chronic immune conditions comprise administering to a subject having a chronic immune condition an effective amount of a multispecific polypeptide agent comprising at least one binding site that specifically binds to a PD-1 molecule, and at least one binding site that specifically binds to a TIM-3 molecule.
  • the multispecific polypeptide agent is a multispecific antibody or a multispecific antibody fragment thereof.
  • Such methods can also comprise administering to a subject having a chronic immune condition an effective amount of a bispecific polypeptide agent comprising at least one binding site that specifically binds to a PD-1 molecule, and at least one binding site that specifically binds to a TIM-3 molecule.
  • the bispecific polypeptide agent is a bispecific antibody or a bispecific antibody fragment thereof.
  • the methods comprise activating an immune response in a subject having a chronic immune condition, by administering the multispecific and bispecific polypeptide agents described herein.
  • the methods further comprise the step of identifying or selecting a subject having a chronic immune condition, or a subject in need of an activated immune response.
  • the PD-1 molecule comprises the sequence set forth in SEQ ID NO:l, or is an allelic or splice variant of SEQ ID NO: l.
  • the TIM-3 molecule comprises the sequence set forth in SEQ ID NO:2, or is an allelic or splice variant of SEQ ID NO:2.
  • PD-1 ligand interaction site In some embodiments, specific binding to the PD-1 ligand interaction site modulates interaction of PD-1 with PD-L1. In some embodiments, specific binding to the PD-1 ligand interaction site modulates interaction of PD-1 with PD-L2. In some embodiments, specific binding to the PD-1 ligand interaction site modulates interaction of PD-1 with PD-L1 and PD-L2.
  • the ligand interaction site of PD-1 comprises amino acid residues 41-136 of SEQ ID NO: l. In some embodiments, the ligand interaction site of PD-1 consists essentially of amino acid residues 41-136 of SEQ ID NO: l. In some embodiments, the ligand interaction site on PD-1 comprises any of the amino acid residues selected from the group consisting of amino acids 64, 66, 68, 73, 74, 75, 76, 78, 90, 122, 124, 126, 128, 130, 131, 132, 134, and 136 of SEQ ID NO: l. In some embodiments, the ligand interaction site on PD-1 comprises any of the amino acid residues selected from the group consisting of amino acids 78, 126, and 136 of SEQ ID NO: l.
  • TIM-3 molecule is directed against a TIM-3 ligand interaction site.
  • binding to the TIM-3 ligand interaction site modulates interaction of TIM-3 with galectin-9.
  • specific binding to the TIM-3 ligand interaction site modulates interaction of TIM-3 with phosphatidylserine.
  • specific binding to the TIM-3 ligand interaction site modulates interaction of TIM-3 with galectin-9 and phosphatidylserine.
  • the TIM-3 ligand interaction site comprises amino acid residues 24-131 of SEQ ID NO:2. In some embodiments, the TIM-3 ligand interaction site consists essentially of amino acid residues 24-131 of SEQ ID NO:2. In some embodiments, the TIM-3 ligand interaction site comprises any of the amino acid residues selected from the group consisting of amino acids 50, 62, 69, 112, and 121 of SEQ ID NO:2. In some embodiments, the TIM-3 ligand interaction site comprises any of the amino acid residues selected from the group consisting of amino acids 44, 74, and 100 of SEQ ID NO:2.
  • the chronic immune condition is a persistent infection. In some embodiments of these methods, the chronic immune condition is a cancer or a tumor. In some embodiments of these methods, the chronic immune condition comprises a population of functionally exhausted T cells. In some embodiments, the population of functionally exhausted T cells comprises a CD8+ T cell population. In some embodiments, the population of functionally exhausted T cells comprises a CD4+ T cell population. In some embodiments, the methods further comprise selecting a subject having a population of functionally exhausted T cells, such as a population of functionally exhausted CD8+ T cells, a population of functionally exhausted CD4+ T cells, or a combination thereof.
  • a bispecific polypeptide agent described herein binds a cell that expresses both the first cell surface target and the second cell surface target more strongly ⁇ e.g., with greater avidity) than a cell that expresses only one target. Accordingly, a bispecific polypeptide agent as described herein can selectively and specifically bind to a cell that expresses the first target and the second target.
  • a non-limiting example of a bispecific polypeptide agent is a bispecific antibody or antigen-binding fragment thereof.
  • multispecific polypeptide agent refers to a polypeptide that comprises at least a first polypeptide domain having a binding site that has binding specificity for a first target, and a second polypeptide domain having a binding site that has binding specificity for a second target.
  • the first target and the second target are not the same (i.e., ate different targets (e.g. , proteins)), but are both present (e.g. , co-expressed) on a cell, such as on a cytotoxic T cell as described herein.
  • a multispecific polypeptide agent as described herein can in addition bind one or more additional targets, i.e., a multispecific polypeptide can bind at least two, at least three, at least four, at least five, at least six, or more targets, wherein the multispecific polypeptide agent has at least two, at least, at least three, at least four, at least five, at least six, or more target binding sites respectively.
  • a multispecific polypeptide agent binds a cell that expresses all the targets the agent is specific more strongly (e.g. , with greater avidity) than a cell that expresses only one target, or less targets than the agent is specific for.
  • a non-limiting example of a multispecific polypeptide agent is a multispecific antibody or antigen-binding fragment thereof.
  • a bispecific polypeptide agent is a type of multispecific polypeptide agent.
  • the term "target” refers to a biological molecule (e.g. , peptide, polypeptide, protein, lipid, carbohydrate) to which a polypeptide domain which has a binding site can selectively bind.
  • the target can be, for example, an intracellular target (e.g. , an intracellular protein target) or a cell surface target (e.g. , a membrane protein, a receptor protein).
  • a target is a cell surface target, such as a cell surface protein.
  • the first cell surface target and second cell surface target are both present on a cell (e.g. , a T cell).
  • the term "specificity" refers to the number of different types of antigens or antigenic determinants to which a particular antibody or antigen-binding fragment thereof can bind.
  • the specificity of an antibody or antigen-binding fragment or portion thereof, alone or in the context of a bispecific or multispecific polypeptide agent, can be determined based on affinity and/or avidity.
  • the affinity represented by the equilibrium constant for the dissociation (K D ) of an antigen with an antigen-binding protein (such as a bispecific or multispecific polypeptide agent), is a measure for the binding strength between an antigenic determinant and an antigen-binding site on the antigen-binding protein: the lesser the value of the K D , the stronger the binding strength between an antigenic determinant and the antigen-binding molecule.
  • the affinity can also be expressed as the affinity constant (K A ), which is 1/ K D ).
  • affinity can be determined in a manner known per se, depending on the specific antigen of interest.
  • a bispecific or multispecific polypeptide agent as defined herein is said to be "specific for" a first target or antigen compared to a second target or antigen when it binds to the first antigen with an affinity (as described above, and suitably expressed, for example as a K D value) that is at least 10 times, such as at least 100 times, and preferably at least 1000 times, and up to 10.000 times or more better than the affinity with which said amino acid sequence or polypeptide binds to another target or polypeptide.
  • an affinity as described above, and suitably expressed, for example as a K D value
  • a bispecific or multispecific polypeptide agent is "specific for" a target or antigen compared to another target or antigen, it is directed against said target or antigen, but not directed against such other target or antigen.
  • Avidity is the measure of the strength of binding between an antigen-binding molecule (such as a bispecific polypeptide agent described herein) and the pertinent antigen. Avidity is related to both the affinity between an antigenic determinant and its antigen binding site on the antigen-binding molecule, and the number of pertinent binding sites present on the antigen-binding molecule.
  • antigen-binding proteins such as a bispecific polypeptide agent described herein
  • K D dissociation constant
  • K A association constant
  • Any K D value greater than 10 " 4 mol/liter (or any K A value lower than 10 4 M "1 ) is generally considered to indicate non-specific binding.
  • the K D for biological interactions which are considered meaningful are typically in the range of 10 "10 M (0.1 nM) to 10 "5 M (10000 nM). The stronger an interaction is, the lower is its K D .
  • a binding site on a bispecific or multispecific polypeptide agent described herein will bind to the desired antigen with an affinity less than 500 nM, preferably less than 200 nM, more preferably less than 10 nM, such as less than 500 pM.
  • Specific binding of an antigen-binding protein to an antigen or antigenic determinant can be determined in any suitable manner known per se, including, for example, Scatchard analysis and/or competitive binding assays, such as
  • RIA radioimmunoassays
  • EIA enzyme immunoassays
  • sandwich competition assays sandwich competition assays
  • selectively binds or “specifically binds” refers to the ability of a polypeptide domain described herein to bind to a target, such as a molecule present on the cell-surface, with a K D 10 "5 M (10000 nM) or less, e.g., 10 "6 M or less, 10 "7 M or less, 10 “8 M or less, 10 "9 M or less, 10 "10 M or less, 10 "11 M or less, or 10 "12 M or less.
  • a polypeptide agent described herein binds to TIM-3 with a K D of 10 "5 M or lower, but not to TIM-1 or TIM-4, or a related homologue, then the agent is said to specifically bind TIM-3.
  • Specific binding can be influenced by, for example, the affinity and avidity of the polypeptide agent and the concentration of polypeptide agent.
  • the person of ordinary skill in the art can determine appropriate conditions under which the polypeptide agents described herein selectively bind the targets using any suitable methods, such as titration of a polypeptide agent in a suitable cell binding assay.
  • double positive refers to a cell that contains two different cell surface targets (different target species) that are bound by a polypeptide agent described herein.
  • the polypeptide agents described herein bind double positive cells with high avidity.
  • single positive refers to a cell that contains only one cell surface target that is bound by a polypeptide agent, as described herein.
  • immunoglobulin refers to a family of polypeptides which retain the immunoglobulin fold characteristic of antibody molecules, which comprise two ⁇ sheets and, usually, a conserved disulphide bond.
  • Members of the immunoglobulin superfamily are involved in many aspects of cellular and non-cellular interactions in vivo, including widespread roles in the immune system (for example, antibodies, T-cell receptor molecules and the like), involvement in cell adhesion (for example the ICAM molecules) and intracellular signaling (for example, receptor molecules, such as the PDGF receptor).
  • an "antibody” refers to IgG, IgM, IgA, IgD or IgE molecules or antigen-specific antibody fragments thereof (including, but not limited to, a Fab, F(ab') 2 , Fv, disulphide linked Fv, scFv, single domain antibody, closed conformation multispecific antibody, disulphide-linked scfv, diabody), whether derived from any species that naturally produces an antibody, or created by recombinant DNA technology; whether isolated from serum, B -cells, hybridomas, transfectomas, yeast or bacteria.
  • an "antigen" is a molecule that is bound by a binding site on a polypeptide agent.
  • antigens are bound by antibody ligands and are capable of raising an antibody response in vivo.
  • An antigen can be a polypeptide, protein, nucleic acid or other molecule.
  • the bispecific or multispecific polypeptide agents described herein are selected for target specificity against two particular antigens ⁇ i.e. , PD-1 and TIM-3).
  • the antibody binding site as defined by the variable loops (LI, L2, L3 and HI, H2, H3) is capable of binding to the antigen.
  • antigenic determinant refers to an epitope on the antigen recognized by an antigen-binding molecule (such as bispecific polypeptide agent described herein), and more particularly, by the antigen-binding site of said molecule.
  • an "epitope" can be formed both from contiguous amino acids, or noncontiguous amino acids juxtaposed by tertiary folding of a protein. Epitopes formed from contiguous amino acids are typically retained on exposure to denaturing solvents, whereas epitopes formed by tertiary folding are typically lost on treatment with denaturing solvents.
  • An epitope typically includes at least 3, and more usually, at least 5, about 9, or about 8-10 amino acids in a unique spatial conformation.
  • An "epitope” includes the unit of structure conventionally bound by an immunoglobulin V H /V L pair. Epitopes define the minimum binding site for an antibody, and thus represent the target of specificity of an antibody.
  • an epitope represents the unit of structure bound by a variable domain in isolation.
  • the terms "antigenic determinant” and “epitope” can also be used interchangeably herein.
  • An amino acid sequence (such as an antibody, a bispecific or multispecific polypeptide agent as described herein, or generally an antigen binding protein or polypeptide or a fragment thereof) that can specifically bind to, that has affinity for and/or that has specificity for a specific antigenic determinant, epitope, antigen or protein (or for at least one part, fragment or epitope thereof) is said to be "against” or “directed against” said antigenic determinant, epitope, antigen or protein.
  • the term "ligand interaction site" on the target or antigen means a site, epitope, antigenic determinant, part, domain or stretch of amino acid residues on the target or antigen that is a site for binding to a ligand, receptor or other binding partner, a catalytic site, a cleavage site, a site for allosteric interaction, a site involved in multimerisation (such as homomerization or heterodimerization) of the target or antigen; or any other site, epitope, antigenic determinant, part, domain or stretch of amino acid residues on the target or antigen that is involved in a biological action or mechanism of the target or antigen, e.g.
  • a "ligand interaction site” can be any site, epitope, antigenic determinant, part, domain or stretch of amino acid residues on a target or antigen to which a binding site of a bispecific or multispecific polypeptide agent described herein can bind such that the target or antigen (and/or any pathway, interaction, signalling, biological mechanism or biological effect in which the target or antigen is involved) is modulated.
  • a “blocking” antibody or an antibody “antagonist” is one which inhibits or reduces biological activity of the antigen(s) it binds.
  • a PD-1 and TIM-3 bispecific antagonist antibody binds PD-1 and TIM-3 and inhibits the ability of PD-1 to, for example, bind PD-L1, and the inhibits the ability of TIM-3 to, for example, bind galectin-9,.
  • the blocking antibodies or antagonist antibodies or fragments thereof described herein completely inhibit the biological activity of the antigen(s).
  • Universal framework refers to a single antibody framework sequence
  • the universal framework can be a V L framework (V 3 ⁇ 4 or V K ), such as a framework that comprises the framework amino acid sequences encoded by the human germline DPK1, DPK2, DPK3, DPK4, DPK5, DPK6, DPK7, DPK8, DPK9, DPK10, DPK12, DPK13, DPK15, DPK16, DPK18, DPK19, DPK20, DPK21, DPK22, DPK23, DPK24, DPK25, DPK26 or DPK 28 immunoglobulin gene segment.
  • the V L framework can further comprise the framework amino acid sequence encoded by the human germline J K 1, J K 2, J K 3, J K 4, or J K 5 immunoglobulin gene segments.
  • the universal framework can be a V H framework, such as a framework that comprises the framework amino acid sequences encoded by the human germline DP4, DP7, DP8, DP9, DP10, DP31, DP33, DP38, DP45, DP46, DP47, DP49, DP50, DP51, DP53, DP54, DP65, DP66, DP67, DP68 or DP69 immunoglobulin gene segments.
  • the V H framework can further comprise the framework amino acid sequence encoded by the human germline J H 1, JH2, JH3, JH4, Jij4b, J H 5 and J H 6 immunoglobulin gene segments.
  • domain refers to a folded protein structure which retains its tertiary structure independently of the rest of the protein. Generally, domains are responsible for discrete functional properties of proteins, and in many cases can be added, removed or transferred to other proteins without loss of function or properties of the remainder of the protein to which it is added or transferred and/or of the domain itself.
  • binding domain refers to such a domain that is directed against an antigenic determinant
  • single antibody variable domain is meant a folded polypeptide domain comprising sequences characteristic of antibody variable domains.
  • each polypeptide agent can comprise at least two different domains.
  • An "Fv" fragment is an antibody fragment which contains a complete antigen recognition and binding site. This region consists of a dimer of one heavy and one light chain variable domain in tight association, which can be covalent in nature, for example in scFv. It is in this configuration that the three CDRs of each variable domain interact to define an antigen binding site on the surface of the V H -V L dimer. Collectively, the six CDRs or a subset thereof confer antigen binding specificity to the antibody. However, even a single variable domain (or half of an Fv comprising only three CDRs specific for an antigen) has the ability to recognize and bind antigen, although usually at a lower affinity than the entire binding site.
  • antibody variable domain refers to the portions of the light and heavy chains of antibody molecules that include amino acid sequences of Complementarity
  • CDRs Determining Regions
  • FRs Framework Regions
  • V H refers to the variable domain of the heavy chain.
  • V L refers to the variable domain of the light chain.
  • amino acid positions assigned to CDRs and FRs may be defined according to Kabat (Sequences of Proteins of Immunological Interest (National Institutes of Health, Bethesda, Md., 1987 and 1991)). Amino acid numbering of antibodies or antigen binding fragments is also according to that of Kabat. [0039] As used herein, the term "Complementarity Determining Regions" (CDRs; i.e. , CDR1,
  • CDR2, and CDR3 refers to the amino acid residues of an antibody variable domain the presence of which are necessary for antigen binding.
  • Each variable domain typically has three CDR regions identified as CDR1, CDR2 and CDR3.
  • Each complementarity determining region may comprise amino acid residues from a "complementarity determining region" as defined by Kabat (i.e. about residues 24-34 (LI), 50-56 (L2) and 89-97 (L3) in the light chain variable domain and 31-35 (HI), 50- 65 (H2) and 95-102 (H3) in the heavy chain variable domain; Kabat et al. , Sequences of Proteins of Immunological Interest, 5th Ed. Public Health Service, National Institutes of Health, Bethesda, Md.
  • a complementarity determining region can include amino acids from both a CDR region defined according to Kabat and a hypervariable loop.
  • the CDRH1 of the human heavy chain of antibody 4D5 includes amino acids 26 to 35.
  • FR Framework regions
  • Each variable domain typically has four FRs identified as FR1, FR2, FR3 and FR4.
  • the CDRs are defined according to Kabat, the light chain FR residues are positioned at about residues 1-23 (LCFRl), 35-49 (LCFR2), 57-88 (LCFR3), and 98-107 (LCFR4) and the heavy chain FR residues are positioned about at residues 1-30 (HCFR1), 36-49 (HCFR2), 66-94 (HCFR3), and 103-113 (HCFR4) in the heavy chain residues.
  • the light chain FR residues are positioned about at residues 1-25 (LCFRl), 33-49 (LCFR2), 53-90 (LCFR3), and 97-107 (LCFR4) in the light chain and the heavy chain FR residues are positioned about at residues 1-25 (HCFR1), 33-52 (HCFR2), 56-95 (HCFR3), and 102-113 (HCFR4) in the heavy chain residues.
  • the FR residues will be adjusted accordingly.
  • CDRH1 includes amino acids H26-H35
  • the heavy chain FR1 residues are at positions 1-25 and the FR2 residues are at positions 36-49.
  • the "Fab” fragment contains a variable and constant domain of the light chain and a variable domain and the first constant domain (C H 1) of the heavy chain.
  • F(ab') 2 antibody fragments comprise a pair of Fab fragments which are generally covalently linked near their carboxy termini by hinge cysteines between them. Other chemical couplings of antibody fragments are also known in the art.
  • Single -chain Fv or “scFv” antibody fragments comprise the V H and V L domains of antibody, wherein these domains are present in a single polypeptide chain.
  • the Fv polypeptide further comprises a polypeptide linker between the V H and V L domains, which enables the scFv to form the desired structure for antigen binding.
  • diabodies refers to small antibody fragments with two antigen-binding sites, which fragments comprise a heavy chain variable domain (V H ) connected to a light chain variable domain (V L ) in the same polypeptide chain (V H and V L ).
  • V H heavy chain variable domain
  • V L light chain variable domain
  • linear antibodies refers to the antibodies described in Zapata et al.
  • these antibodies comprise a pair of tandem Fd segments (V H -C H 1-V H -C H 1) which, together with complementary light chain polypeptides, form a pair of antigen binding regions.
  • Linear antibodies can be bispecific or monospecific.
  • An "affinity matured" antibody is one with one or more alterations in one or more
  • affinity matured antibodies will have nanomolar or even picomolar affinities for the target antigen.
  • Affinity matured antibodies are produced by procedures known in the art. Marks et al. Bio/Technology 10:779-783 (1992) describes affinity maturation by V H and V L domain shuffling. Random mutagenesis of CDR and/or framework residues is described by: Barbas et al. Proc Nat. Acad. Sci, USA 91 :3809-3813 (1994); Schier et al. Gene 169: 147-155 (1995); Yelton et al. J. Immunol. 155: 1994-2004 (1995); Jackson et al, J.
  • V H domains are not complementary
  • V L domains are not complementary
  • Complementary domains can be found in other members of the immunoglobulin superfamily, such as the V a and Vp (or ⁇ and ⁇ ) domains of the T-cell receptor. Domains which are artificial, such as domains based on protein scaffolds which do not bind epitopes unless engineered to do so, are non- complementary. Likewise, two domains based on, for example, an immunoglobulin domain and a fibronectin domain are not complementary.
  • library refers to a mixture of heterogeneous polypeptides or nucleic acids.
  • the library is composed of members, each of which have a single polypeptide or nucleic acid sequence.
  • library is synonymous with repertoire. Sequence differences between library members are responsible for the diversity present in the library.
  • the library can take the form of a simple mixture of polypeptides or nucleic acids, or can be in the form of organisms or cells, for example bacteria, viruses, animal or plant cells and the like, transformed with a library of nucleic acids.
  • each individual organism or cell contains only one or a limited number of library members.
  • the nucleic acids are incorporated into expression vectors, in order to allow expression of the polypeptides encoded by the nucleic acids.
  • a library can take the form of a population of host organisms, each organism containing one or more copies of an expression vector containing a single member of the library in nucleic acid form which can be expressed to produce its corresponding polypeptide member.
  • the population of host organisms has the potential to encode a large repertoire of genetically diverse polypeptide variants.
  • modulating or “to modulate” generally means either reducing or inhibiting the activity of, or alternatively increasing the activity of, a target or antigen, as measured using a suitable in vitro, cellular or in vivo assay.
  • modulating or “to modulate” can mean either reducing or inhibiting the activity of, or alternatively increasing a (relevant or intended) biological activity of, a target or antigen, as measured using a suitable in vitro, cellular or in vivo assay (which will usually depend on the target or antigen involved), by at least 5%, at least 10%, at least 25%, at least 50%, at least 60%, at least 70%, at least 80%, or 90% or more, compared to activity of the target or antigen in the same assay under the same conditions but without the presence of a bispecific or multispecific polypeptide agent described herein.
  • modulating can also involve effecting a change (which can either be an increase or a decrease) in affinity, avidity, specificity and/or selectivity of a target or antigen for one or more of its ligands, binding partners, partners for association into a homomultimeric or heteromultimeric form, or substrates; and/or effecting a change (which can either be an increase or a decrease) in the sensitivity of the target or antigen for one or more conditions in the medium or surroundings in which the target or antigen is present (such as pH, ion strength, the presence of co-factors, etc.), compared to the same conditions but without the presence of a bispecific or multispecific polypeptide agent.
  • Modulating can also mean effecting a change (i.e. an activity as an agonist, as an antagonist or as a reverse agonist, respectively, depending on the target or antigen and the desired biological or physiological effect) with respect to one or more biological or physiological mechanisms, effects, responses, functions, pathways or activities in which the target or antigen (or in which its substrate(s), ligand(s) or pathway(s) are involved, such as its signaling pathway or metabolic pathway and their associated biological or physiological effects) is involved.
  • a change i.e. an activity as an agonist, as an antagonist or as a reverse agonist, respectively, depending on the target or antigen and the desired biological or physiological effect
  • an action as an agonist or an antagonist can be determined in any suitable manner and/or using any suitable (in vitro and usually cellular or in assay) assay known per se, depending on the target or antigen involved.
  • an action as an agonist or antagonist can be such that an intended biological or physiological activity is increased or decreased, respectively, by at least 5%, at least 10%, at least 25%, at least 50%, at least 60%, at least 70%, at least 80%, or 90% or more, compared to the biological or physiological activity in the same assay under the same conditions but without the presence of the construct of a bispecific or multispecific polypeptide agent.
  • reduce or inhibit is meant the ability to cause an overall decrease preferably of 20% or greater, 30% or greater, 40% or greater, 45% or greater, more preferably of 50% or greater, of 55% or greater, of 60 % or greater, of 65% or greater, of 70% or greater, and most preferably of 75%, 80%, 85%, 90%, 95%, or up to and including 100%.
  • Modulating can for example also involve allosteric modulation of the target or antigen; and/or reducing or inhibiting the binding of the target or antigen to one of its substrates or ligands and/or competing with a natural ligand, substrate for binding to the target or antigen.
  • Modulating can also involve activating the target or antigen or the mechanism or pathway in which it is involved. Modulating can for example also involve effecting a change in respect of the folding or confirmation of the target or antigen, or in respect of the ability of the target or antigen to fold, to change its confirmation (for example, upon binding of a ligand), to associate with other (sub)units, or to disassociate. Modulating can for example also involve effecting a change in the ability of the target or antigen to transport other compounds or to serve as a channel for other compounds (such as ions).
  • anti-cancer therapy refers to a therapy useful in treating cancer.
  • anti-cancer therapeutic agents include, but are not limited to, e.g. , surgery, chemotherapeutic agents, growth inhibitory agents, cytotoxic agents, agents used in radiation therapy, anti-angiogenesis agents, apoptotic agents, anti-tubulin agents, and other agents to treat cancer, such as anti-HER-2 antibodies (e.g. , Herceptin®), anti-CD20 antibodies, an epidermal growth factor receptor (EGFR) antagonist (e.g. , a tyrosine kinase inhibitor), HER1/EGFR inhibitor (e.g.
  • erlotinib Tarceva®
  • platelet derived growth factor inhibitors e.g. , GleevecTM (Imatinib Mesylate)
  • a COX -2 inhibitor e.g. , celecoxib
  • interferons cytokines
  • antagonists e.g. , neutralizing antibodies
  • cytotoxic agent refers to a substance that inhibits or prevents the function of cells and/or causes destruction of cells.
  • the term is intended to include radioactive isotopes (e.g. At 211 , 1 131 , 1 125 , Y 90 , Re 186 , Re 188 , Sm 153 , Bi 212 , P 32 and radioactive isotopes of Lu), chemotherapeutic agents, and toxins such as small molecule toxins or enzymatically active toxins of bacterial, fungal, plant or animal origin, including fragments and/or variants thereof.
  • radioactive isotopes e.g. At 211 , 1 131 , 1 125 , Y 90 , Re 186 , Re 188 , Sm 153 , Bi 212 , P 32 and radioactive isotopes of Lu
  • chemotherapeutic agents e.g. At 211 , 1 131 , 1 125 , Y 90 , Re 186
  • chemotherapy refers to any chemical agent with therapeutic usefulness in the treatment of diseases characterized by abnormal cell growth. Such diseases include tumors, neoplasms and cancer as well as diseases characterized by hyperplastic growth.
  • Chemotherapeutic agents as used herein encompass both chemical and biological agents. These agents function to inhibit a cellular activity upon which the cancer cell depends for continued survival. Categories of chemotherapeutic agents include alkylating/alkaloid agents, antimetabolites, hormones or hormone analogs, and miscellaneous antineoplastic drugs. Most if not all of these agents are directly toxic to cancer cells and do not require immune stimulation.
  • a chemotherapeutic agent is an agent of use in treating neoplasms such as solid tumors.
  • a chemotherapeutic agent is a radioactive molecule.
  • a chemotherapeutic agent of use e.g. see Slapak and Kufe, Principles of Cancer Therapy, Chapter 86 in Harrison's Principles of Internal Medicine, 14th edition; Perry et al ,
  • radiation therapy is meant the use of directed gamma rays or beta rays to induce sufficient damage to a cell so as to limit its ability to function normally or to destroy the cell altogether. It will be appreciated that there will be many ways known in the art to determine the dosage and duration of treatment. Typical treatments are given as a one time administration and typical dosages range from 10 to 200 units (Grays) per day.
  • reduce or inhibit is meant the ability to cause an overall decrease preferably of
  • Reduce or inhibit can refer to, for example, the symptoms of the disorder being treated, the presence or size of metastases or micrometastases, the size of the primary tumor, the presence or the size of the dormant tumor, or the load of infectious agent.
  • the terms “functional exhaustion” or “unresponsiveness” refers to a state of a cell where the cell does not perform its usual function or activity in response to normal input signals. Such a function or activity includes, but is not limited to, proliferation or cell division, entrance into the cell cycle, cytokine production, cytotoxicity, or any combination thereof.
  • Normal input signals can include, but are not limited to, stimulation via a receptor (e.g. , T cell receptor, B cell receptor, co-stimulatory receptor).
  • a cell that is functionally exhausted is a cytotoxic T lymphocyte (CTL) that expresses the CD8 cell surface marker.
  • CTL cytotoxic T lymphocyte
  • Such CTLs normally proliferate, lyse target cells (cytotoxicity), and/or produce cytokines such as IL-2, TNFoc, IFNy, or a combination therein in response to T cell receptor and/or co- stimulatory receptor stimulation.
  • a functionally exhausted or unresponsive CTL or CD8+ T cell is one which does not proliferate, lyse target cells (cytotoxicity), and/or produce cytokines, such as IL-2, TNFoc, IFNy, in response to normal input signals.
  • a cell that is functionally exhausted is a helper T lymphocyte (T H cell) that expresses the CD4 cell surface marker.
  • T H cell helper T lymphocyte
  • T H cells normally proliferate and/or produce cytokines such as IL-2, IFNy, TNFoc, IL-4, IL-5, IL-17, IL-10, or a combination thereof, in response to T cell receptor and/or co- stimulatory receptor stimulation.
  • the cytokines produced by T H cells act, in part, to activate and/or otherwise modulate, i.e. , "provide help," to other immune cells such as B cells and CD8+ cells.
  • a functionally exhausted or unresponsive T H cell or CD4+ T cell is one which does not proliferate and/or produce cytokines, such as IL-2, IFNy, TNFoc, IL-4, IL-5, IL-17, IL-10 in response to normal input signals.
  • FIGURES 1A-1C show PD-1 and Tim-3 expression in tumor -infiltrating lymphocytes.
  • Balb/c mice were implanted with CT26 colon adenocarcinoma or 4T1 mammary adenocarcinoma.
  • C57BL/6 mice were implanted with B16F10 melanoma.
  • TILs were harvested and stained with 7AAD, to exclude dead cells, and antibodies against CD8, CD4, Tim-3 and PD-1.
  • FIGURE 1A shows expression of Tim-3 and PD-1 on gated CD4 + and CD8 + TILs from a Balb/c mouse bearing CT26 tumor. FMO, fluorescence minus one controls for Tim-3 and PD-1 staining are shown. Data shown are representative of more than five independent analyses.
  • FIGURES 2A and 2B demonstrate CD44 and CD62L expression in Tim-3 and PD-1 expressing TILs.
  • TILs were harvested from CT26 tumor-bearing mice and stained with 7AAD, to exclude dead cells, and antibodies against CD8, CD44, CD62L, Tim -3, and PD-1.
  • FIGURE 2A shows representative staining on CD8+ Tim-3-PD-l-, Tim-3-PD-l+ and Tim-3+PD-l+ TILs. FMO, fluorescence minus one controls for CD44 and CD62L staining are shown.Data are representative of 3 independent analyses.
  • FIGURE 2B depicts summary data showing the frequency of naive
  • CD44 low CD62L hi Effector (CD44 low CD62L low ), Effector Memory (CD44 hi CD62L low ) and Central Memory (CD44 hi CD62L hi ) with the CD8 + Tim-3 " PD-1 " , Tim-3 " PD-1 + , and Tim-3 + PD-l + TILs.
  • FIGURES 3A-3B demonstrate cytokine production in TILs from CT26 tumor- bearing mice.
  • TILs were harvested from CT26 tumor-bearing mice and stimulated with PMA and Ionomycin prior to intracytoplasmic cytokine staining.
  • FIGURE 3A shows expression of cytokine in Tim-3-PD-l+ and Tim-3+PD-l+ CD8 + TILs. Data shown are representative of five independent analyses. FMO, fluorescence minus one (anti-cytokine antibody).
  • FIGURES 4A-4B demonstrate proliferation and cell cycle entry in TILs from CT26 tumor-bearing mice.
  • TIL s were harvested from CT 26 tumor-bearing mice and stimulated with anti- CD3 (1 g/ml) prior to staining with antibodies against CD8, Tim-3, PD-1 and Ki-67 and TO-PRO-3 - iodide.
  • FIGURE 4A shows expression of Ki-67 and TO-PRO-3 staining in CD8+ TILs showing the different phases of the cell cycle: GO, Gl, and S->M. Data shown are representative of six independent analyses.
  • FIGURES 5A-5B demonstrate the effect of co-targeting the Tim-3 and PD- 1 signaling pathways on tumor growth.
  • FIGURE 5B depicts the pooled data from the experiments shown in Figure 5A. Left panel,*p ⁇ 0.01 compared to control or Anti-Tim-3 group. Right panel, *p ⁇ 0.01 compared to control group and p ⁇ 0.05 compared to Anti-Tim-3 group. One-way ANOVA, Tukey' s multiple comparison test.
  • FIGURE 6 demonstrates Tim-3 and PD-1 expression in spleen of tumor-bearing mice.
  • Balb/c mice were implanted with CT26 colon adenocarcinoma.
  • Spleen cells were harvested and stained with 7AAD to exclude dead cells and antibodies against CD8, CD4, Tim-3 and PD-1.
  • Tim-3 and PD-1 on gated CD4+ and CD8+ cells is shown. Data shown are
  • FIGURE 7 demonstrates expression of PD-L1, Tim-3 and Galectin-9 on CT26 tumor cells.
  • CT26 tumor cells were stained with antibodies against PD-L1, galectin-9 or Tim-3 (open histogram). Fluorescence minus one (FMO) staining (shaded histogram). Data are representative of two independent experiments.
  • FIGURE 8 demonstrates effects of antibodies on tumor growth in vitro.
  • CT26 tumor cells (1x106) were cultured in vitro for 48 hrs in the presence of 10 g/ml anti-PD-Ll antibody or isotype control. Viable cells were quantified by trypan blue exclusion at the end of the culture period. Each point represents an independent culture well. Data are representative of two independent experiments.
  • FIGURE 9 demonstrates that combined blockade of the Tim-3 and PD-1 signaling pathways restores IFNy production.
  • TILs were harvested from CT26 tumor-bearing mice and cultured in vitro in the presence of soluble anti-CD3 and either anti-Tim-3, anti-PD-Ll, anti-Tim-3 plus anti- PD-Ll or control immunoglobulins. After 96 hours, culture supernatant was collected and IFNy measured by cytometric bead array (CBA). Data are expressed as the difference in cytokine production over that observed in cultures with control immunoglobulins. Data shown are from three independent TILs samples from two independent experiments.
  • FIGURE 10 shows the effect of co-targeting both the Tim-3 and PD-1 signaling pathways on peripheral T cell responses.
  • Splenocytes from CT26 tumor-bearing mice were cultured (3xl0 5 /well) in the presence of anti-CD3 (5 ⁇ g/ml) and 10 ⁇ g/ml of either anti-Tim-3, anti-PD-Ll, anti-Tim-3 plus anti-PD-Ll , or control immunoglobulins. After 96 hours, culture supernatant was collected and IFNy measured by cytometric bead array (CBA) (BD Biosciences). Data are expressed as the difference in cytokine production over that observed in cultures with control immunoglobulins. Data shown are from two independent experiments.
  • CBA cytometric bead array
  • FIGURE 11 demonstrates that combined targeting of Tim-3 and PD-1 pathways increases survival in a B 16 melanoma model.
  • FIGURE 12 demonstrates restoration of tumor specific T cell response in mice treated with anti-Tim-3 and anti-PD-Ll.
  • Cells from the draining lymph node of Balb/c mice implanted with CT-26 colon carcinoma were treated with either control immunoglobulin, anti-Tim-3 antibody (clone 2C12), anti-PD-Ll antibody (clone 10F.9G2), or both antibodies.
  • Cells from the tumor draining lymph node of treated mice were cultured with the tumor antigen AH1 (30 ⁇ g/ml). Production of IFN- ⁇ ⁇ supernatant collected at 48 hrs is shown. *p>0.01, **p>0.05, One-way ANOVA, Tukey's multiple comparison test. Data shown are the mean of two independent samples. Similar results were obtained in two additional independent experiments.
  • FIGURE 13 demonstrates effects of targeting the Tim-3 and PD-1 pathways on established tumors.
  • compositions and methods for targeting cells co-expressing both the PD-1 and Tim-3 inhibitory receptors are based, in part, on the novel discovery that combined inhibition of the Tim-3 and PD-1 pathways restores immunological activities and functions of exhausted or unresponsive immune cells, such as T cells, and that such combined inhibition of these two pathways is more effective at controlling and treating chronic immune conditions characterized by a lack of or inhibition of a specific immune response, such as cancer or a persistent infection, than targeting either pathway alone.
  • compositions comprising bispecific and multispecific polypeptide agents that specifically bind to PD-1 and TIM-3 when these molecules are co-expressed on the surface of a cell, and methods for targeting cells, such as functionally exhausted or unresponsive immune cells, that co-express these inhibitory receptors, during chronic immune conditions.
  • these bispecific and multispecific polypeptide agents prevent and/or inhibit PD-1 and TIM-3 inhibitory signals, and thus permit the restoration of or increase the immune response of a cell expressing these receptors.
  • bispecific and multispecific polypeptide agents selectively bind cells that co-express PD-1 and TIM-3, undesirable effects that can result from delivering a therapeutic agent to a single positive cell can be avoided using the polypeptide agents described herein.
  • use of the bispecific and multipsecific polypeptides in the compositions and methods described herein can prevent activation of non-exhausted or pathogenic, e.g., self-specific, T cells that express only Tim-3 or only PD-1, and prevent the unwanted targeting of effector cells expressing only Tim-3 or only PD- 1 that are mounting a productive immune response.
  • PD-1 (or CD279) is a 288 amino acid type I transmembrane protein composed of one immunoglobulin (Ig) superfamily domain, a 20 amino acid stalk, a transmembrane domain, and an intracellular domain of approximately 95 residues containing an immunoreceptor tyrosine-based inhibitory motif (ITIM), as well as an immunoreceptor tyrosine-based switch motif (ITSM).
  • ITIM immunoglobulin
  • ITMS immunoreceptor tyrosine-based switch motif
  • PD-1 is encoded by the Pdcdl and PDCD1 genes on chromosome 1 in mice and chromosome 2 in humans respectively. In both species, Pdcdl consists of 5 exons. Exon 1 encodes a short signal sequence, whereas exon 2 encodes an Ig domain.
  • exon 3 The stalk and transmembrane domains make up exon 3, and exon 4 codes for a short 12 amino acid sequence that marks the beginning of the cytoplasmic domain.
  • Exon 5 contains the C-terminal intracellular residues and a long 3' UTR (Keir ME et al. , 2008. Annu Rev Immunol. 26:677-704).
  • PD-1 is a member of the B7 family of receptors.
  • Splice variants of PD-1 have been cloned from activated human T cells. These transcripts lack exon 2, exon 3, exons 2 and 3, or exons 2 through 4. All these variants, except for the splice variant lacking exon 3 only (PD-lAex3), are expressed at similar levels as full-length PD-1 in resting peripheral blood mononuclear cells (PBMCs). All variants are significantly induced upon activation of human T cells with anti-CD3 and anti-CD28 (Keir ME et al., 2008. Annu Rev Immunol. 26:677-704).
  • PD-1 refers to the 288 amino acid polypeptide having the amino acid sequence of:
  • PD-1 refers to human PD-1.
  • the term "PD-1 " is also used to refer to truncated forms or fragments of the PD-1 polypeptide. Reference to any such forms of PD-1 can be identified in the application, e.g., by "PD-1 (42-136).”
  • the mature PD-1 peptide is referred to herein as PD-l(21-288), and PD-1 IgV domain as PD-1(42-136).
  • Specific residues of PD-1 can be referred to as, for example, "PD-1(68).”
  • PD-1 has been shown to be expressed on T cells, B cells, natural killer T cells, activated monocytes, and dendritic cells (DCs). PD-1 is not expressed on resting T cells but is inducibly expressed after activation. Ligation of the T cell receptor or B cell receptor can upregulate PD-1 on T and B lymphocytes. In normal human reactive lymphoid tissue, PD-1 is expressed on germinal center-associated T cells. PD-1 compartmentalization in intracellular stores has been described in a regulatory T cell population. PD-1 is inducibly expressed on APCs on myeloid CDl lc+ DCs and monocytes in humans (Keir ME et al. , 2008. Annu Rev Immunol. 26:677-704).
  • PD-1 has two known ligands, PD-Ll and PD-L2, which are also members of the B7 family.
  • the binding interface of PD-1 to PD-Ll is via its IgV-like domain ⁇ i.e. , PD-1 (42- 136)).
  • Residues important for binding of PD-1 to its ligands include residues 64, 66, 68, 73, 74, 75, 76, 78, 90, 122, 124, 126, 128, 130, 131, 132, 134, and 136.
  • PD-L1/CD274 has been shown to be
  • CD274/PD-L1 expression is also found on a wide range of nonhematopoietic cells and is upregulated on a number of cell types after activation.
  • PD-Ll is expressed on almost all murine tumor cell lines, including PA1 myeloma, P815 mastocytoma, and B 16 melanoma upon treatment with IFN- ⁇ .
  • phosphatase and tensin homolog a cellular phosphatase that modifies phosphatidylinositol 3-kinase (PI3K) and Akt signaling
  • PTEN phosphatase and tensin homolog
  • PI3K phosphatidylinositol 3-kinase
  • Akt phosphatidylinositol 3-kinase
  • Residues of PD-Ll important for binding to PD-1 include PD-L1(67), PD-L1(121), PD- Ll(122), PD-L1(123), PD-L1(123), PD-L1(124), and PD-L1(126).
  • PD-L2 expression is more restricted than PD-Ll expression.
  • PD-L2 is inducibly expressed on DCs, macrophages, and bone marrow-derived mast cells.
  • PD-L2 is also expressed on 50% to 70% of resting peritoneal B l cells, but not on conventional B2 B cells.
  • PD-L2 can also be induced on monocytes and macrophages by GM-CSF, IL-4, and IFN- ⁇ .
  • PD-L2 expression has also been observed on tumor lines.
  • PD-1 and its ligands have been shown to have important roles in regulating immune defenses against microbes that cause acute and chronic infections.
  • the PD-LPD-L pathways appear to play important roles in the outcome of infection, and the regulation of the delicate balance between effective antimicrobial immune defenses and immune-mediated tissue damage.
  • a bispecific or multispecific polypeptide agent inhibits or blocks binding of PD-1 to its ligands.
  • LCMV lymphocytic choriomeningitis virus
  • CD8 T cells Functional dysregulation, also termed herein as "exhaustion,” of CD8 T cells is an important reason for ineffective viral control during chronic infections and is characteristic of chronic LCMV infection in mice, as well as of HIV, HBV, HCV, and HTLV infection in humans and SIV infection in primates.
  • PD-1 expression is high on HIV-specific (Petrovas C et al. 2006. J. Exp. Med. 203:2281-92; Day CL et al. 2006. Nature 443:350-54; Trautmann L et al. 2006. Nat. Med. 12: 1198-202), HBV-specific (Boettler T et al. 2006. J. Virol.
  • the PD-1 :PD-L pathway also can play a key role in the chronicity of bacterial infections.
  • Helicobacter pylori causes chronic gastritis and gastroduodenal ulcers and is a risk factor for development of gastric cancer.
  • T cell responses are insufficient to clear infection, leading to persistent infection.
  • Gastric epithelial cells express MHC class II molecules and are thought to have important APC (antigen-presenting cell) function during H. pylori infection.
  • Anti- PD-L1 blocking antibodies enhance T cell proliferation and IL-2 production in cultures of gastric epithelial cells exposed to H.
  • Parasitic worms also have exploited the PD-1 :PD-L pathways to induce macrophages with strong suppressive function.
  • PD-1 :PD-L pathways to induce macrophages with strong suppressive function.
  • PD-L1 and PD-L2 are upregulated on activated macrophages.
  • the PD-1 :PD-L pathways have also been shown to have distinct roles in the immune response to the protozoan parasite Leishmania mexicana (Keir ME et al. , 2008. Annu Rev Immunol. 26:677-704).
  • Tumors express antigens that can be recognized by host T cells, but immunologic clearance of tumors is rare. Part of this failure is due to immune suppression by the tumor microenvironment.
  • PD-1 PD-L pathways are involved in suppression of anti-cancer/tumor immune responses.
  • PD-1 expression is upregulated on tumor infiltrating lymphocytes, and this can contribute to tumor immunosuppression.
  • PD-Ll expression has been shown in situ on a wide variety of solid tumors, including breast, lung, colon, ovarian, melanoma, bladder, liver, salivary, stomach, gliomas, thyroid, thymic epithelial, head, and neck.
  • PD-Ll expression is inversely correlated with intraepithelial, but not stromal, infiltrating CD8 T cells, suggesting that PD-Ll inhibits the intratumor migration of CD8 T cells.
  • studies relating PD-Ll expression on tumors to disease outcome show that PD-Ll expression strongly correlates with unfavorable prognosis in kidney, ovarian, bladder, breast, gastric, and pancreatic cancer but not small cell lung cancer (Keir ME et al., 2008. Annu Rev Immunol. 26:677-704).
  • the PD-1 pathway can also play a role in hematologic malignancies.
  • PD-1 is highly expressed on the T cells of angioimmunoblastic lymphomas, and PD-Ll is expressed on the associated follicular dendritic cell network.
  • nodular lymphocyte -predominant Hodgkin lymphoma the T cells associated with lymphocytic and/or histiocytic (L&H) cells express PD-1.
  • PD-1 and PD-Ll are expressed on CD4 T cells in HTLV-1 -mediated adult T cell leukemia and lymphoma.
  • PD-L2 has been identified as being highly expressed in mantle cell lymphomas.
  • PD-Ll is expressed on multiple myeloma cells but not on normal plasma cells, and T cell expansion in response to myeloma cells is enhanced in vitro by PD-Ll blockade.
  • PD-Ll is expressed on some primary T cell lymphomas, particularly anaplastic large cell T lymphomas (Keir ME et al., 2008. Annu Rev Immunol. 26:677- 704).
  • a bispecific or multispecific polypeptide agent inhibits or blocks binding of PD-1 to one or more of its ligands.
  • TIM-3 is a Type I cell-surface glycoprotein that comprises an N-terminal
  • TIM-3 is a member of the T cell/transmembrane, immunoglobulin, and mucin (TIM) gene family.
  • TIM-3 refers to the 301 amino acid polypeptide having the amino acid sequence of:
  • TIM-3 refers to human TIM-3.
  • TIM-3 is also used to refer to truncated forms or fragments of the TIM-3 polypeptide. Reference to any such forms or fragments of TIM-3 can be identified in the application, e.g., by "TIM-3 (24-131).” Specific residues of TIM-3 can be referred to as, for example, "TIM-3(62).”
  • TIM-3 was originally identified as a mouse Thl -specific cell surface protein that was expressed after several rounds of in vitro Thl differentiation, and was later shown to also be expressed on Thl7 cells. In humans, TIM-3 is expressed on a subset of activated CD4+ T cells, on differentiated Thl cells, on some CD8+ T cells, and at lower levels on Thl7 cells (Hastings WD, et al. 2009, Eur J Immunol. 39:2492-2501). TIM-3 is also expressed on cells of the innate immune system including mouse mast cells, subpopulations of macrophages and dendritic cells (DCs), NK and NKT cells, and human monocytes, and on murine primary bronchial epithelial cell lines.
  • DCs subpopulations of macrophages and dendritic cells
  • NK and NKT cells NK and NKT cells
  • human monocytes and on murine primary bronchial epithelial cell lines.
  • TIM-3 expression is regulated by the transcription factor T-bet.
  • TIM-3 can generate an inhibitory signal resulting in apoptosis of Thl and Tel cells, and can mediate phagocytosis of apoptotic cells and cross- presentation of antigen.
  • Polymorphisms in TIM-1 and TIM-3 can reciprocally regulate the direction of T-cell responses (Freeman GJ et al., Immunol Rev. 2010 Can;235(l): 172-89).
  • TIM-3 has two known ligands, galectin-9 and phosphatidylserine.
  • Galectin-9 is an S- type lectin with two distinct carbohydrate recognition domains joined by a long flexible linker, and has an enhanced affinity for larger poly-N-acetyllactosamine-containing structures.
  • Galectin-9 does not have a signal sequence and is localized in the cytoplasm. However, it can be secreted and exerts its function by binding to glycoproteins on the target cell surface via their carbohydrate chains (Freeman GJ et al , Immunol Rev. 2010 Can;235(l): 172-89).
  • Galectin-9 is expressed broadly including in immune cells and the epithelium of the gastrointestinal tract. Galectin-9 expression is particularly high in mast cells and also found in T cells, B cells, macrophages, endothelial cells, and fibroblasts. Galectin-9 production can be upregulated by IFN- ⁇ . Galectin-9 has also been reported to exert various biologic functions via interaction with CD44 and IgE. Engagement of TIM-3 by galectin-9 leads to Thl cell death and a consequent decline in IFN- ⁇ production.
  • galectin-9 When given in vivo, galectin-9 had beneficial effects in several murine disease models, including an EAE model, a mouse model of arthritis, in cardiac and skin allograft transplant models, and contact hypersensitivity and psoriatic models (Freeman GJ et al., Immunol Rev. 2010
  • Residues important for TIM-3 binding to galectin-9 include TIM-3(44), TIM- 3(74), and TIM-3(100), which undergo N- and/or O-glycosylation.
  • phosphatidylserine PtdSer
  • PtdSer phosphatidylserine
  • TIM-3-expressing cells bound and/or engulfed apoptotic cells expressing PtdSer Interaction of TIM-3 with PtdSer does not exclude an interaction with galectin-9 as the binding sites have been found to be on opposite sides of the IgV domain.
  • Residues important for TIM-3 binding to PtdSer include TIM-3(50), TIM-3(62), TIM-3(69), TIM-3(112), and TIM-3(121).
  • TIM-3 in mediating T-cell dysfunction associated with chronic viral infections (Golden-Mason L, et al., 2009 J Virol;83:9122-9130; Jones RB, et al., 2008 J Exp Med. 205:2763-2779).
  • TIM-3 was expressed on about 50% of CD8+ T cells, and was expressed on virus-specific CD8+ T cells. It was found that blocking of the TIM-3 pathway ex vivo increased HIV- 1 -specific T cell responses.
  • the TIM-3+ T cell subset was primarily distinct from the PD-1+ T cell subset (Golden-Mason L, et al, 2009 J Virol;83:9122-9130).
  • TIM-3 expression was increased on CD4+ and CD8+ T cells, specifically HCV-specific CD8+ cytotoxic T cells (CTLs). It was found that a majority of virus- specific CTLs expressed PD-1, either alone, or co-expressed with Tim-3. Treatment with a blocking monoclonal antibody to TIM-3 reversed HCV-specific T cell exhaustion (Jones RB, et al. , 2008 J Exp Med. 205:2763-2779).
  • a bispecific or multispecific polypeptide agent inhibits or blocks binding of TIM-3 to one or more of its ligands.
  • polypeptide agents that specifically bind to PD-1 and TIM-3 when these molecules are co-expressed on the surface of a cell, such as a functionally exhausted immune cell.
  • the polypeptide agents can comprise at least one polypeptide domain having a binding site with binding specificity for a PD-1 target, and at least one polypeptide domain having a binding site with binding specificity for a TIM-3 target. As described herein, such polypeptide agents can selectively bind to double positive cells that co-express both PD-1 and TIM-3.
  • polypeptides that specifically bind cell-surface antigens can be formatted into polypeptide agents as described herein to provide agents that can selectively bind to cells that co-express PD-1 and TIM-3. Because these bispecific and multispecific polypeptide agents selectively bind cells that co-express PD-1 and TIM-3, undesirable effects that can result from delivering a therapeutic agent to a single positive cell ⁇ e.g. , activation of non-exhausted or pathogenic ⁇ e.g. , self-specific) T cells) can be avoided using the polypeptide agents described herein.
  • a polypeptide agent can be formatted as a bispecific polypeptide agent as described herein, and in US 2010/0081796 and US 2010/0021473, the contents of which are herein incorporated in their entireties by reference.
  • a polypeptide agent can be formatted as a multispecific polypeptide agent, for example as described in WO 03/002609, the entire teachings of which are incorporated herein by reference.
  • Bispecific and multispeciiic polypeptide agents can comprise immunoglobulin variable domains that have different binding specificities. Such bispecific and multispeciiic polypeptide agents can comprise combinations of heavy and light chain domains.
  • a bispecific polypeptide agent can comprise a V H domain and a V L domain, which can be linked together in the form of an scFv (e.g., using a suitable linker such as Gly 4 Ser) that binds one target, i.e., either PD-1 or Tim-3.
  • a construct that includes, e.g., an scFv that binds TIM-3 and an scFv that binds PD-1 is said to be bispecific for PD-1 and TIM-3. Similar arrangements can be applied in the context of, e.g., a bispecific F(ab') 2 construct.
  • the bispecific and multispeciiic polypeptide agents may not comprise complementary V H /V L pairs which form an antigen-binding site that binds to a single antigen or epitope co-operatively as found in conventional two chain antibodies. Instead, in some embodiments, the bispecific and multispeciiic polypeptide agents can comprise a V H /V L complementary pair, wherein the V domains each have different binding specificities, such that two different epitopes or antigens are specifically bound.
  • the bispecific and multispeciiic polypeptide agents comprise one or more C H or C L domains.
  • a hinge region domain can also be included in some embodiments.
  • Such combinations oi domains can, for example, mimic natural antibodies, such as IgG or IgM, or fragments thereof, such as Fv, scFv, Fab or F(ab') 2 molecules.
  • Other structures, such as a single arm of an IgG molecule comprising V H , V L , C H 1 and C L domains, are also encompassed within the embodiments described herein.
  • a plurality of bispecific polypeptide agents are combined to form a multimer.
  • bispecific polypeptide agents can be combined to create a tetra-specific molecule.
  • the light and heavy variable regions of a bispecific or multispeciiic polypeptide agent produced according to the methods described herein can be on the same polypeptide chain, or alternatively, on different polypeptide chains.
  • the variable regions are on different polypeptide chains, then they can be linked via a linker, generally a flexible linker (such as a polypeptide chain), a chemical linking group, or any other method known in the art.
  • the bispecific and multispeciiic polypeptide agents can be formatted as bi- or multispeciiic antibodies or antigen-binding fragments thereoi, or into bi- or multispeciiic non-antibody structures.
  • Suitable formats include, for example, any suitable polypeptide structure in which an antibody variable domain, or one or more oi the CDRs thereoi, can be incorporated so as to conier binding specificity for antigen on the structure.
  • bispecific IgG-like formats e.g., chimeric antibodies, humanized antibodies, human antibodies, single chain antibodies, heterodimers of antibody heavy chains and/or light chains, antigen-binding fragments of any of the foregoing (e.g. , a Fv fragment (e.g. , single chain Fv (scFv), a disulfide bonded Fv), a Fab fragment, a Fab' fragment, a F(ab') 2 fragment), a single variable domain (e.g., V H , V L , V HH X a dAb, and modified versions of any of the foregoing (e.g. , modified by the covalent attachment of polyalkylene glycol (e.g., polyethylene glycol, polypropylene glycol, polybutylene glycol) or other suitable polymer).
  • polyalkylene glycol e.g., polyethylene glycol, polypropylene glycol, polybutylene glycol
  • suitable polymer e.g
  • bispecific or multispecific polypeptide agents can be linked to an antibody Fc region, comprising one or both of C H 2 and C H 3 domains, and optionally a hinge region.
  • vectors encoding bispecific or multispecific polypeptide agents linked as a single nucleotide sequence to an Fc region can be used to prepare such polypeptides.
  • antigen-binding fragments of antibodies can be combined and/or formatted into non-antibody multispecific polypeptide structures to form multivalent complexes, which bind target molecules having the same epitope, thereby providing superior avidity.
  • natural bacterial receptors such as SpA can been used as scaffolds for the grafting of CDRs to generate ligands which bind specifically to one or more epitopes. Details of this procedure are described in U.S. Pat. No. 5,831,012, herein incorporated by reference in its entirety.
  • Other suitable scaffolds include those based on fibronectin and affibodies. Details of suitable procedures are described in WO 98/58965, herein incorporated by reference in its entirety.
  • Suitable scaffolds include lipocallin and CTLA4, as described in van den Beuken et al, J. Mol. Biol. 310:591-601 (2001), and scaffolds such as those described in WO 00/69907 (Medical Research Council), herein incorporated by reference in their entireties, which are based for example on the ring structure of bacterial GroEL or other chaperone polypeptides.
  • protein scaffolds can be combined.
  • CDRs specific for PD-1 and TIM-3 can be grafted onto a CTLA4 scaffold and used together with immunoglobulin V H or V L domains to form a bispecific or multispecific polypeptide agent.
  • fibronectin, lipocallin and other scaffolds can be combined in other embodiments.
  • the bispecific or multispecific polypeptide agents can be formatted as fusion proteins that contain a first antigen-binding domain that is fused directly to a second antigen-binding domain. If desired, in some embodiments, such a format can further comprise a half -life extending moiety.
  • the bispecific or multispecific polypeptide agent can comprise a first antigen-binding domain specific for PD-1, that is fused directly to a second antigen-binding domain specific for TIM-3, that is fused directly to an antigen-binding domain that binds serum albumin.
  • orientation of the polypeptide domains that have a binding site with binding specificity for a target, and whether a bispecific or multispecific polypeptide agent comprises a linker are a matter of design choice. However, some orientations, with or without linkers, can provide better binding characteristics than other orientations. All orientations are encompassed by the aspects and embodiments described herein, and bispecific or multispecific polypeptide agents that contain an orientation that provides desired binding characteristics can be easily identified by screening.
  • multispecific agents comprising at least one binding site that specifically binds to a PD-1 molecule, and at least one binding site that specifically binds to a TIM-3 molecule.
  • the PD-1 molecule bound by the multispecific agent has the sequence set forth in SEQ ID NO: l, or is an allelic or splice variant of SEQ ID NO: l.
  • the TIM-3 molecule bound by the multispecific agent has the sequence set forth in SEQ ID NO:2, or is an allelic or splice variant of SEQ ID NO:2.
  • bispecific agents having a first binding site that specifically binds to a PD-1 molecule, and a second binding site that specifically binds to a TIM-3 molecule.
  • the PD-1 molecule bound by the bispecific agent has the sequence set forth in SEQ ID NO: l, or is an allelic or splice variant of SEQ ID NO: l.
  • the TIM-3 molecule bound by the bispecific agent has the sequence set forth in SEQ ID NO:2, or is an allelic or splice variant of SEQ ID NO:2.
  • the bispecific or multispecific polypeptide agents described herein will generally bind to naturally occurring or synthetic analogs, variants, mutants, alleles, parts and fragments of a PD-1 and/or TIM-3 target; or at least to those analogs, variants, mutants, alleles, parts and fragments of a PD-1 and/or TIM-3 target, that contain one or more antigenic determinants or epitopes that are essentially the same as the antigenic determinant(s) or epitope(s) to which the bispecific or multispecific polypeptide agents described herein bind on the PD-1 and TIM-3 target.
  • the amino acid sequences and polypeptides described herein bind to some analogs, variants, mutants, alleles, parts and fragments of a PD-1 and/or TIM-3 target, but not to others.
  • the binding sites of the bispecific polypeptide agents are directed against a target's ligand interaction site.
  • the binding sites of the bispecific polypeptide agents are directed against a site on a target in the proximity of the ligand interaction site, in order to provide steric hindrance for the interaction of the target with its receptor or ligand.
  • the site against which the bispecific polypeptide agents described herein are directed is such that binding of the target to its receptor or ligand is modulated, and in particular, inhibited or prevented.
  • a bispecific polypeptide agent or multispecific polypeptide agent described herein can reduce or inhibit the activity or expression of PD-1.
  • a bispecific polypeptide agent or multispecific polypeptide agent that specifically binds to PD-1 has the ability to reduce the activity or expression of PD-1 in a cell (e.g. , T cells such as CD8+ T cells) by at least 5%, at least 10%, at least 20%, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, at least 95 % or up to and including 100% relative to untreated control levels.
  • a bispecific polypeptide agent or multispecific polypeptide agent can reduce or inhibit the activity or expression of TIM-3.
  • a bispecific polypeptide agent or multispecific polypeptide agent that specifically binds to TIM-3 has the ability to reduce the activity or expression of TIM-3 in a cell (e.g. , T cells such as CD8+ T cells) by at least 5%, at least 10%, at least 20%, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, at least 95 %, or up to and including 100% relative to untreated control levels.
  • a binding site of a bispecific or multispecific polypeptide agent is directed against a ligand interaction site on PD-1 such that the interaction of PD-1 with PD-L1 is modulated, and in particular inhibited or prevented.
  • a binding site of a bispecific or multispecific polypeptide agent is directed against a ligand interaction site on PD-1 such that the interaction of PD-1 with PD-L2 is modulated, and in particular inhibited or prevented.
  • a binding site of a bispecific or multispecific polypeptide agent is directed against a ligand interaction site on PD-1 , such that the interaction of PD- 1 with PD-L1 is modulated, and in particular inhibited or prevented, and a ligand interaction site such that the interaction of PD-1 with PD-L2 is modulated, and in particular inhibited or prevented.
  • a bispecific or multispecific polypeptide agent as described herein is directed against a ligand interaction site on PD-1 such that the interaction of PD-1 with PD-L1 is modulated, and in particular inhibited or prevented, while the interaction of PD-1 with PD-L2 is not modulated, inhibited, or prevented.
  • a bispecific or multispecific polypeptide agent as described herein is directed against a ligand interaction site on PD-1 such that the interaction of PD-1 with PD-L2 is modulated, and in particular inhibited or prevented while the interaction of PD-1 with PD-L1 is not modulated, inhibited or prevented.
  • a ligand interaction site of PD-1 comprises amino acid residues 41-136 of SEQ ID NO: l .
  • a ligand interaction site on PD-1 comprises any of the amino acid residues selected from the group consisting of amino acids 64, 66, 68, 73, 74, 75, 76, 78, 90, 122, 124, 126, 128, 130, 131 , 132, 134, and 136 of SEQ ID NO: l .
  • a ligand interaction site on PD-1 comprises any of the amino acid residues selected from the group consisting of amino acids 78, 126, and 136 of SEQ ID NO: l.
  • a binding site of a bispecific or multispecific polypeptide agent is directed against a ligand interaction site on TIM-3 such that the interaction of TIM-3 with galectin-9 is modulated, and in particular inhibited or prevented.
  • a binding site of a bispecific or multispecific polypeptide agent is directed against a ligand interaction site on TIM-3 such that the interaction of TIM-3 with phosphatidylserine is modulated, and in particular inhibited or prevented.
  • a binding site of a bispecific or multispecific polypeptide agent is directed against a ligand interaction site on TIM-3, such that the interaction of TIM-3 with galectin-9 is modulated, and in particular inhibited or prevented, and a ligand interaction site such that the interaction of TIM-3 with phosphatidylserine is modulated, and in particular inhibited or prevented.
  • a bispecific or multispecific polypeptide agent is directed against a ligand interaction site on TIM-3, such that the interaction of TIM-3 with galectin-9 is modulated, and in particular inhibited or prevented, and a ligand interaction site such that the interaction of TIM-3 with phosphatidylserine is modulated, and in particular inhibited or prevented.
  • multispecific polypeptide agent as described herein is directed against a ligand interaction site on TIM-3 such that the interaction of TIM-3 with galectin-9 is modulated, and in particular inhibited or prevented, while the interaction of TIM-3 with phosphatidylserine is not modulated, inhibited, or prevented.
  • a bispecific or multispecific polypeptide agent as described herein is directed against a ligand interaction site on TIM-3 such that the interaction of TIM-3 with phosphatidylserine is modulated, and in particular inhibited or prevented while the interaction of TIM-3 with galectin-9 is not modulated, inhibited or prevented.
  • a ligand interaction site of TIM-3 comprises amino acid residues 24-131 of SEQ ID NO:2.
  • a ligand interaction site on TIM-3 comprises any of the amino acid residues selected from the group consisting of amino acids 50, 62, 69, 112, and 121 of SEQ ID NO:2.
  • a ligand interaction site on PD-1 comprises any of the amino acid residues selected from the group consisting of amino acids 44, 74, and 100 of SEQ ID NO:2.
  • Antibodies suitable for practicing the methods described herein are preferably monoclonal and multispecific, and can include, but are not limited to, human, humanized or chimeric antibodies, comprising single chain antibodies, Fab fragments, F(ab') fragments, fragments produced by a Fab expression library, and/or binding fragments of any of the above.
  • Antibodies also refer to immunoglobulin molecules and immunologically active portions of immunoglobulin molecules, i.e., molecules that contain at least two antigen or target binding sites that specifically bind PD-1 and TIM-3.
  • immunoglobulin molecules described herein can be of any type (e.g., IgG, IgE, IgM, IgD, IgA and IgY), class (e.g., IgGl, IgG2, IgG3, IgG4, IgAl and IgA2) or subclass of immunoglobulin molecule, as is understood by one of skill in the art.
  • the term "monoclonal antibody” as used herein refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e. , the individual antibodies comprising the population are identical except for possible naturally occurring mutations that may be present in minor amounts. Monoclonal antibodies are highly specific, being directed against a single antigen. Furthermore, in contrast to polyclonal antibody preparations that typically include different antibodies directed against different determinants (epitopes), each monoclonal antibody is directed against a single determinant on the antigen.
  • the modifier "monoclonal” is not to be construed as requiring production of the antibody by any particular method.
  • the monoclonal antibodies to be used in accordance with the invention may be made by the hybridoma method first described by Kohler et al , Nature 256:495 (1975), or may be made by recombinant DNA methods (see, e.g. , U.S. Pat. No. 4,816,567).
  • the "monoclonal antibodies” may also be isolated from phage antibody libraries using the techniques described in Clackson et al. , Nature 352:624-628 (1991) or Marks et al , J. Mol. Biol. 222:581-597 (1991), for example.
  • antibody fragment refers to a protein fragment that comprises only a portion of an intact antibody, generally including an antigen binding site of the intact antibody and thus retaining the ability to bind antigen.
  • antibody fragments encompassed by the present definition include: (i) the Fab fragment, having V L , C L , V H and C H 1 domains; (ii) the Fab' fragment, which is a Fab fragment having one or more cysteine residues at the C-terminus of the C H 1 domain; (iii) the Fd fragment having V H and C H 1 domains; (iv) the Fd' fragment having V H and C H 1 domains and one or more cysteine residues at the C-terminus of the CHI domain; (v) the Fv fragment having the V L and V H domains of a single arm of an antibody; (vi) the dAb fragment (Ward et al.
  • bispecific antibodies having an IgG-like format have the conventional four chain structure of an IgG molecule (2 heavy chains and two light chains), in which one antigen-binding region (comprised of a V H and a V L domain) specifically binds PD-1 and the other antigen-binding region (also comprised of a V H and a V L domain) specifically binds TIM-3.
  • each of the variable regions (2 V H regions and 2 V L regions) is replaced with a dAb or single variable domain.
  • the dAb(s) or single variable domain(s) that are included in an IgG-like format can have the same specificity or different specificities.
  • the IgG-like format is tetravalent and can have two, three or four specificities.
  • the IgG-like format can be bispecific and comprise 3 dAbs that have the same specificity and another dAb that has a different specificity; bispecific and comprise two dAbs that have the same specificity and two dAbs that have a common but different specificity; trispecific and comprise first and second dAbs that have the same specificity, a third dAb with a different specificity and a fourth dAb with a different specificity from the first, second and third dAbs; or tetraspecific and comprise four dAbs that each have a different specificity.
  • Antigen-binding fragments of IgG-like formats e.g. , Fab, F(ab') 2 , Fab', Fv, scFv
  • IgG-like formats e.g. , Fab, F(ab') 2 , Fab', Fv, scFv
  • the interface between a pair of antibody molecules can be engineered to maximize the percentage of heterodimers which are recovered from recombinant cell culture.
  • Such interfaces can comprise at least a part of the CH 3 domain of an antibody constant domain.
  • one or more small amino acid side chains from the interface of the first antibody molecule are replaced with larger side chains (e.g. , tyrosine or tryptophan).
  • Compensatory "cavities" of identical or similar size to the large side chain(s) are created on the interface of the second antibody molecule by replacing large amino acid side chains with smaller ones (e.g. , alanine or threonine). This provides a mechanism for increasing the yield of the heterodimer over other unwanted end-products such as homodimers.
  • the bispecific antibodies described herein include cross-linked or
  • heteroconjugate antibodies For example, one of the antibodies in the heteroconjugate can be coupled to avidin, the other to biotin. Such antibodies have, for example, been proposed to target immune system cells to unwanted cells (U.S. Pat. No. 4,676,980), and for treatment of HIV infection (WO 91/00360, WO 92/200373, and EP 03089). Heteroconjugate antibodies can be made using any convenient cross-linking methods. Suitable cross-linking agents are well known in the art, and are disclosed in U.S. Pat. No. 4,676,980, along with a number of cross-linking techniques. In one embodiment, the bispecific antibodies do not comprise a heteroconjugate.
  • bispecific antibodies can be prepared using chemical linkage.
  • Brennan et al., Science, 229: 81 (1985) describe a procedure wherein intact antibodies are proteolytically cleaved to generate F(ab') 2 fragments. These fragments are reduced in the presence of the dithiol complexing agent sodium arsenite to stabilize vicinal dithiols and prevent intermolecular disulfide formation.
  • the Fab' fragments generated are then converted to
  • thionitrobenzoate (TNB) derivatives One of the Fab'-TNB derivatives is then reconverted to the Fab'- thiol by reduction with mercaptoet-hylamine and is mixed with an equimolar amount of the other Fab'-TNB derivative to form the bispecific antibody.
  • a bispecific antibody specific for PD-1 and TIM-3 produced using this method can be used in any of the compositions and methods described herein.
  • a bispecific antibody specific for PD-1 and TIM-3 can be produced using any of the methods described in U.S. Patent Application No.: 20100233173; U.S. Patent Application No.: 20100105873; U.S. Patent Application No.: 20090155275; U.S. Patent Application No.: 20080071063; and U.S. Patent Application No.: 20060121042, the contents of each of which are herein incoporated in their entireties by reference.
  • a bispecific antibody specific for PD-1 and TIM-3 can be produced using any of the methods described in U.S. Patent Application No.: 20090175867 and U.S. Patent Application No.: 20110033483the contents of which are herein incoporated in their entireties by reference.
  • the bispecific antibodies can be made by the direct recovery of
  • Fab'-SH fragments recombinantly expressed, e.g. , in E. coli, and can be chemically coupled to form bispecific antibodies.
  • Shalaby et al. J Exp. Med, 175: 217-225 (1992) describe the production of a fully humanized bispecific antibody F(ab') 2 molecule.
  • Each Fab' fragment was separately secreted from E. coli and subjected to directed chemical coupling in vitro to form the bispecific antibody.
  • the bispecific antibody thus formed was able to bind to cells overexpressing the ErbB2 receptor and normal human T cells, as well as trigger the lytic activity of human cytotoxic lymphocytes against human breast tumor targets. Accordingly, this method can be used to generate a bispecific antibody to PD-1 and TIM-3 to restore responsiveness in immune cells, such as cytotoxic T cells.
  • bispecific antibodies have been produced using leucine zippers (Kostelny et al., J. Immunol, 148(5): 1547-1553 (1992)).
  • the leucine zipper peptides from the Fos and Jun proteins were linked to the Fab' portions of two different antibodies by gene fusion.
  • the antibody homodimers were reduced at the hinge region to form monomers and then re -oxidized to form the antibody heterodimers. This method can also be utilized for the production of antibody homodimers.
  • the "diabody” technology described by Hollinger et al. , Proc. Natl. Acad. Sci. USA, 90:6444-6448 (1993) has provided an alternative mechanism for making bispecific antibody fragments.
  • the fragments comprise a heavy-chain variable domain (V H ) connected to a light-chain variable domain (V L ) by a linker which is too short to allow pairing between the two domains on the same chain. Accordingly, the V H and V L domains of one fragment are forced to pair with the complementary V H and V L domains of another fragment, thereby forming two antigen-binding sites.
  • Another strategy for making bispecific antibody fragments by the use of single-chain Fv (sFv) dimers has also been reported. See Gruber et al., J. Immunol., 152:5368 (1994).
  • the antibodies can be "linear antibodies" as described in Zapata et al. Protein Eng.
  • these antibodies comprise a pair of tandem Fd segments (V H -C H 1- V H -C H l) which form a pair of antigen binding regions.
  • Linear antibodies can be bispecific or multispecific.
  • compositions and methods described herein encompass the use of an antibody or derivative thereof comprising a heavy or light chain variable domain, where the variable domain comprises (a) a set of three CDRs, and (b) a set of four framework regions, and in which the antibody or antibody derivative thereof specifically binds PD-1 and TIM-3.
  • chimeric antibody derivatives of the bispecific and mutispecific polypeptide agents i.e., antibody molecules in which a portion of the heavy and/or light chain is identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chain(s) is identical with or homologous to corresponding sequences in antibodies derived from another species or belonging to another antibody class or subclass, as well as fragments of such antibodies, so long as they exhibit the desired biological activity (U.S. Pat. No. 4,816,567; and Morrison et al , Proc. Natl. Acad. Sci. USA 81 :6851-6855 (1984)).
  • Chimeric antibody molecules can include, for example, one or more antigen binding domains from an antibody of a mouse, rat, or other species, with human constant regions.
  • a variety of approaches for making chimeric antibodies have been described and can be used to make chimeric antibodies containing the immunoglobulin variable region which recognizes the selected antigens, i.e. , PD-1 and TIM-3, on the surface of differentiated cells or tumor-specific cells. See, for example, Takeda et al., 1985, Nature 314:452; Cabilly et al. , U.S. Pat. No. 4,816,567; Boss et al.,; Tanaguchi et al., European Patent Publication EP171496; European Patent Publication 0173494, United Kingdom patent GB 2177096B).
  • the bispecific and mutispecific polypeptide agents described herein can also be a humanized antibody derivative.
  • Humanized forms of non-human ⁇ e.g. , murine) antibodies are chimeric antibodies which contain minimal sequence derived from non-human immunoglobulin.
  • humanized antibodies are human immunoglobulins (recipient antibody) in which residues from a hypervariable region of the recipient are replaced by residues from a hypervariable region of a non-human species (donor antibody) such as mouse, rat, rabbit or nonhuman primate having the desired specificity, affinity, and capacity.
  • donor antibody such as mouse, rat, rabbit or nonhuman primate having the desired specificity, affinity, and capacity.
  • Fv framework region (FR) residues of the human immunoglobulin are replaced by corresponding non-human residues.
  • humanized antibodies may comprise residues which are not found in the recipient antibody or in the donor antibody. These modifications are made to further refine antibody
  • the humanized antibody will comprise substantially all of at least one, and typically two, variable domains, in which all or substantially all of the hypervariable loops correspond to those of a non-human immunoglobulin and all or substantially all of the FR regions are those of a human immunoglobulin sequence.
  • the humanized antibody optionally also will comprise at least a portion of an immunoglobulin constant region (Fc), typically that of a human immunoglobulin.
  • Fc immunoglobulin constant region
  • Chemical conjugation can also be used to generate the bispecific or multispecific antibodies described herein, and is based on the use of homo- and heterobifunctional reagents with E- amino groups or hinge region thiol groups.
  • Homobifunctional reagents such as 5,5'-Dithiobis(2- nitrobenzoic acid) (DNTB) generate disulfide bonds between the two Fabs, and 0- phenylenedimaleimide (O-PDM) generate thioether bonds between the two Fabs (Brenner et al., 1985, Glennie et al., 1987).
  • Heterobifunctional reagents such as N-succinimidyl-3-(2-pyridylditio) propionate (SPDP) combine exposed amino groups of antibodies and Fab fragments, regardless of class or isotype (Van Dijk et al., 1989).
  • SPDP N-succinimidyl-3-(2-pyridylditio) propionate
  • the antibodies described herein i.e. , antibodies that are useful for treating chronic immune conditions and are specific for PD-1 and TIM-3, include derivatives that are modified, i.e., by the covalent attachment of any type of molecule to the antibody such that covalent attachment does not prevent the antibody from binding to PD-1 or TIM-3.
  • the antibody derivatives include antibodies that have been modified, e.g., by glycosylation, acetylation, pegylation, phosphorylation, amidation, derivatization by known protecting/blocking groups, proteolytic cleavage, linkage to a cellular ligand or other protein, etc. Any of numerous chemical modifications can be carried out by known techniques, including, but not limited to specific chemical cleavage, acetylation, formylation, metabolic synthesis of turicamycin, etc. Additionally, the derivative can contain one or more non-classical amino acids.
  • the bispecific or multispecific antibodies described herein for use in the treatment of chronic immune conditions can be generated by any suitable method known in the art.
  • Monoclonal and polyclonal antibodies against both PD-1 and TIM-3 are known in the art.
  • the skilled artisan can generate new monoclonal or polyclonal anti-PD-1 and anti-TIM-3 antibodies as discussed below or as known in the art.
  • the bispecific and multispecific antibodies and antigen-binding fragments thereof described herein can utilize PD-1 binding site sequences from monoclonal antibodies against human PD-1, such as, MDX-1106 (ONO-4538), a fully human IgG4 anti-PD-1 blocking antibody (Journal of Clinical Oncology, 2008 Vol 26, No 15S); CT-011 (CureTech, LTD, previously CT-AcTibody or BAT), a humanized monoclonal IgGl antibody (Benson DM et al , Blood.
  • PD-1 binding site sequences from monoclonal antibodies against human PD-1 such as, MDX-1106 (ONO-4538), a fully human IgG4 anti-PD-1 blocking antibody (Journal of Clinical Oncology, 2008 Vol 26, No 15S); CT-011 (CureTech, LTD, previously CT-AcTibody or BAT), a humanized monoclonal IgGl antibody (Benson DM et al , Blood.
  • bispecific and multispecific antibodies and antigen-binding fragments thereof described herein can utilize TIM-3 binding site sequences from monoclonal antibodies against human TIM-3, such as those obtained from, clone F38-2E2
  • an antigen binding site against PD-1 having the amino acid sequences of the CDR regions of MDX-1106, and an antigen binding site against TIM-3 having the amino acid sequences of the CDR regions of the antibody produced by clone 344823 can be grafted onto an appropriate framework, such as a human IgGl backbone, to generate a bispecific antibody construct as described herein.
  • Polyclonal antibodies specific for PD-1 or TIM-3 can be produced by various procedures well known in the art.
  • PD-1 or TIM-3 polypeptides or fragments thereof such as a fragment comprising amino acid residues 42-136 of SEQ ID NO: l, or a fragment comprising amino acid residues 24-131 of SEQ ID NO:2, can be administered to various host animals including, but not limited to, rabbits, mice, rats, etc. to induce the production of sera containing polyclonal antibodies specific for the protein.
  • Polyclonal antibodies are preferably raised in animals by multiple subcutaneous (sc) or intraperitoneal (ip) injections of the relevant antigen, e.g., a PD-1 fragment and an adjuvant.
  • a protein that is immunogenic in the species to be immunized e.g., keyhole limpet hemocyanin, serum albumin, bovine thyroglobulin, or soy-bean trypsin inhibitor using a bifunctional or derivatizing agent, for example,
  • Animals can be immunized against the antigen, immunogenic conjugates, or derivatives by combining, e.g., 100 ⁇ g or 5 ⁇ g of the protein or conjugate (for rabbits or mice, respectively) with 3 volumes of Freund's complete adjuvant and injecting the solution intradermally at multiple sites.
  • the animals are boosted with 1/5 to 1/10 the original amount of peptide or conjugate in Freund's complete adjuvant by subcutaneous injection at multiple sites.
  • Seven to 14 days later the animals are bled and the serum is assayed for antibody titer. Animals are boosted until the titer plateaus.
  • the animal is boosted with the conjugate of the same antigen, but conjugated to a different protein and/or through a different cross-linking reagent.
  • Conjugates also can be made in recombinant cell culture as protein fusions.
  • aggregating agents such as alum are suitably used to enhance the immune response.
  • adjuvants can be used to increase the immunological response, depending on the host species, and include but are not limited to, Freund's (complete and incomplete), mineral gels such as aluminum hydroxide, surface active substances such as lysolecithin, pluronic polyols, polyanions, peptides, oil emulsions, keyhole limpet hemocyanins, dinitrophenol, and potentially useful human adjuvants such as BCG (bacille Calmette-Guerin) and corynebacterium parvum. Suitable adjuvants are also well known to one of skill in the art.
  • Monoclonal antibodies can be prepared using a wide variety of techniques known in the art including the use of hybridoma, recombinant, and phage display technologies, or a combination thereof.
  • Various methods for making monoclonal antibodies described herein are available in the art.
  • the monoclonal antibodies can be made using the hybridoma method first described by Kohler et al. , Nature, 256:495 (1975), or by recombinant DNA methods (U.S. Pat. No. 4,816,567).
  • monoclonal antibodies can be produced using hybridoma techniques including those known in the art and taught, for example, in Harlow et al., Antibodies: A Laboratory Manual, (Cold Spring Harbor Laboratory Press, 2nd ed., 1988); Hammer-ling, et al. , in: Monoclonal Antibodies and T-Cell Hybrido-mas 563-681 (Elsevier, N.Y., 1981) (said references incorporated by reference in their entireties).
  • the term "monoclonal antibody” as used herein is not limited to antibodies produced through hybridoma technology.
  • monoclonal antibody refers to an antibody that is derived from a single clone, including any eukaryotic, prokaryotic, or phage clone, and not the method by which it is produced.
  • mice can be immunized with PD-1, TIM-3, or a fragment or derivative thereof, such as a fragment comprising amino acid residues 42-136 of SEQ ID NO: l, or a fragment comprising amino acid residues 24-131 of SEQ ID NO:2, or a cell expressing PD-1 or TIM-3, or a fragment thereof.
  • an immune response e.g., antibodies specific for PD-1 or TIM-3 are detected in the mouse serum, the mouse spleen is harvested and splenocytes isolated.
  • the splenocytes are then fused by well known techniques to any suitable myeloma cells, for example cells from cell line SP20 available from the ATCC.
  • Hybridomas are selected and cloned by limited dilution.
  • the hybridoma clones are then assayed by methods known in the art for cells that secrete antibodies capable of binding PD-1 and TIM-3 and exerting a cytotoxic or cytostatic effect on activated lymphocytes.
  • Ascites fluid which generally contains high levels of antibodies, can be generated by injecting mice with positive hybridoma clones.
  • a mouse or other appropriate host animal such as a hamster or macaque monkey
  • lymphocytes that produce or are capable of producing antibodies that will specifically bind to the protein used for immunization.
  • lymphocytes can be immunized in vitro. Lymphocytes then are fused with myeloma cells using a suitable fusing agent, such as polyethylene glycol, to form a hybridoma cell (Coding, Monoclonal Antibodies: Principles and Practice, pp. 59-103 (Academic Press, 1986)).
  • the hybridoma cells thus prepared are seeded and grown in a suitable culture medium that preferably contains one or more substances that inhibit the growth or survival of the unfused, parental myeloma cells.
  • a suitable culture medium that preferably contains one or more substances that inhibit the growth or survival of the unfused, parental myeloma cells.
  • the culture medium for the hybridomas typically will include hypoxanthine, aminopterin, and thymidine (HAT medium), which substances prevent the growth of HGPRT-deficient cells.
  • Preferred myeloma cells are those that fuse efficiently, support stable high-level production of antibody by the selected antibody-producing cells, and are sensitive to a medium such as HAT medium.
  • preferred myeloma cell lines are murine myeloma lines, such as those derived from MOPC-21 and MPC-11 mouse tumors available from the Salk Institute Cell Distribution Center, San Diego, Calif. USA, and SP-2 or X63-Ag8-653 cells available from the American Type Culture Collection, Rockville, Md. USA.
  • Human myeloma and mouse-human heteromyeloma cell lines also have been described for the production of human monoclonal antibodies (Kozbor, J.
  • Culture medium in which hybridoma cells are growing is assayed for production of monoclonal antibodies directed against the antigen.
  • the binding specificity of monoclonal antibodies produced by hybridoma cells is determined by immunoprecipitation or by an in vitro binding assay, such as radioimmunoassay (RIA) or enzyme -linked immunoabsorbent assay (ELISA).
  • RIA radioimmunoassay
  • ELISA enzyme -linked immunoabsorbent assay
  • the clones can be subcloned by limiting dilution procedures and grown by standard methods (Coding, Monoclonal Antibodies: Principles and Practice, pp. 59-103 (Academic Press, 1986)). Suitable culture media for this purpose include, for example, D-MEM or RPMI-1640 medium.
  • the hybridoma cells can be grown in vivo as ascites tumors in an animal.
  • the monoclonal antibodies secreted by the subclones are suitably separated from the culture medium, ascites fluid, or serum by conventional immunoglobulin purification procedures such as, for example, protein A-Sepharose, hydroxylapatite chromatography, gel electrophoresis, dialysis, or affinity chromatography.
  • DNA encoding the monoclonal antibodies can be readily isolated and sequenced using conventional procedures (e.g., by using oligonucleotide probes that are capable of binding specifically to genes encoding the heavy and light chains of the monoclonal antibodies).
  • the hybridoma cells serve as a preferred source of such DNA.
  • the DNA can be placed into expression vectors, which are then transfected into host cells such as E. coli cells, simian COS cells, Chinese hamster ovary (CHO) cells, or myeloma cells that do not otherwise produce immunoglobulin protein, to obtain the synthesis of monoclonal antibodies in the recombinant host cells. Recombinant production of antibodies is described in more detail below.
  • antibodies useful in the methods and compositions described herein can also be generated using various phage display methods known in the art, such as isolation from antibody phage libraries generated using the techniques described in McCafferty et al. , Nature, 348:552-554 (1990). Clackson et al, Nature, 352:624-628 (1991) and Marks et al, J. Mol. Biol., 222:581-597 (1991) describe the isolation of murine and human antibodies, respectively, using phage libraries.
  • phage display methods functional antibody domains are displayed on the surface of phage particles which carry the nucleic acid sequences encoding them.
  • phage can be utilized to display antigen binding domains expressed from a repertoire or combinatorial antibody library (e.g. human or murine).
  • phage display methods functional antibody domains are displayed on the surface of phage particles which carry the nucleic acid sequences encoding them.
  • DNA sequences encoding V H and V L domains are amplified from animal cDNA libraries (e.g., human or murine cDNA libraries of lymphoid tissues).
  • the DNA encoding the V H and V L domains are recombined together with an scFv linker by PCR and cloned into a phagemid vector (e.g. , p CANTAB 6 or pComb 3 HSS).
  • the vector is electroporated into E. coli and the E. coli is infected with helper phage.
  • Phage used in these methods are typically filamentous phage including fd and Ml 3 binding domains expressed from phage with Fab, Fv or disulfide stabilized Fv antibody domains recombinantly fused to either the phage gene III or gene VIII protein.
  • Phage expressing an antigen binding domain that binds to PD-1 or TIM-3 or portions thereof can be selected or identified with antigen e.g. , using labeled antigen or antigen bound or captured to a solid surface or bead.
  • phage display methods that can be used to make the antibodies described herein include those disclosed in Brinkman et al, 1995, J. Immunol. Methods 182:41-50; Ames et al , 1995, J.
  • the antibody coding regions from the phage can be isolated and used to generate whole antibodies, including human antibodies, or any other desired antigen binding fragment, and expressed in any desired host, including mammalian cells, insect cells, plant cells, yeast, and bacteria, e.g., as described in detail below.
  • Fab, Fab' and F(ab') 2 fragments can also be employed using methods known in the art such as those disclosed in PCT publication WO 92/22324; Mullinax et al, BioTechniques 1992, 12(6):864-869; and Sawai et al, 1995, AJRI 34:26-34; and Better et al, 1988, Science 240: 1041-1043, the contents of which are herein incorporated by reference in their entireties.
  • a "chimeric antibody” refers to a molecule in which different portions of the antibody are derived from different animal species, such as antibodies having a variable region derived from a murine monoclonal antibody and a human immunoglobulin constant region.
  • Methods for producing chimeric antibodies are known in the art. See e.g., Morrison, Science, 1985, 229: 1202; Oi et al, 1986, Bio-Techniques 4:214; Gillies et al , 1989, J. Immunol. Methods 125: 191-202; U.S. Pat. Nos. 5,807,715; 4,816,567; and 4,816,397, the contents of which are herein incorporated by reference in their entireties.
  • Humanized antibodies refer to antibody molecules from a non-human species, where the antibodies that bind the desired antigen, i.e. , PD-1 or TIM-3, have one or more CDRs from the non-human species, and framework and constant regions from a human immunoglobulin molecule. Often, framework residues in the human framework regions will be substituted with the corresponding residue from the CDR donor antibody to alter, preferably improve, antigen binding. These framework substitutions are identified by methods well known in the art, e.g., by modeling of the interactions of the CDR and framework residues to identify framework residues important for antigen binding and sequence comparison to identify unusual framework residues at particular positions. (See, e.g.
  • Antibodies can be humanized using a variety of techniques known in the art including, for example, CDR-grafting (EP 239,400; PCT publication WO 91/09967; U.S. Pat. Nos. 5,225,539; 5,530,101; and 5,585,089), veneering or resurfacing (EP 592,106; EP 519,596; Padlan, Molecular Immunology, 1991, 28(4/5):489-498; Studnicka et al , 1994, Protein Engineering 7(6):805-814; Roguska.
  • a humanized antibody has one or more amino acid residues introduced into it from a source which is non-human. These non- human amino acid residues are often referred to as "import" residues, which are typically taken from an "import" variable domain.
  • Humanization can be essentially performed following the method of Winter and co-workers (Jones et at , Nature, 321 :522-525 (1986); Riechmann et al , Nature, 332:323- 327 (1988); Verhoeyen et al, Science, 239: 1534-1536 (1988)), , the contents of which are herein incorporated by reference in their entireties, by substituting rodent CDRs or CDR sequences for the corresponding sequences of a human antibody. Accordingly, such "humanized" antibodies are chimeric antibodies (U.S. Pat. No.
  • humanized antibodies are typically human antibodies in which some CDR residues and possibly some FR residues are substituted by residues from analogous sites in rodent antibodies.
  • variable domains both light and heavy
  • sequence of the variable domain of a rodent antibody is screened against the entire library of known human variable -domain sequences.
  • the human sequence which is closest to that of the rodent is then accepted as the human framework (FR) for the humanized antibody (Sims et al., J. Immunol., 151 :2296 (1993); Chothia et ⁇ . , ⁇ . Mol. Biol., 196:901 (1987)).
  • Another method uses a particular framework derived from the consensus sequence of all human antibodies of a particular subgroup of light or heavy chains.
  • antibodies be humanized with retention of high affinity for the antigen, i.e., PD-1 and TIM-3, and other favorable biological properties.
  • humanized antibodies are prepared by a process of analysis of the parental sequences and various conceptual humanized products using three-dimensional models of the parental and humanized sequences. Three-dimensional immunoglobulin models are commonly available and are familiar to those skilled in the art. Computer programs are available which illustrate and display probable three-dimensional conformational structures of selected candidate
  • Human antibodies are particularly desirable for the therapeutic treatment of human patients.
  • Human antibodies can be made by a variety of methods known in the art including phage display methods described above using antibody libraries derived from human immunoglobulin sequences. See also, U.S. Pat. Nos. 4,444,887 and 4,716,111 ; and PCT publications WO 98/46645, WO 98/50433, WO 98/24893, WO 98/16654, WO 96/34096, WO 96/33735, and WO 91/10741, the contents of which are herein incorporated by reference in their entireties.
  • Human antibodies can also be produced using transgenic mice which express human immunoglobulin genes, and upon immunization are capable of producing a full repertoire of human antibodies in the absence of endogenous immunoglobulin production.
  • transgenic mice which express human immunoglobulin genes, and upon immunization are capable of producing a full repertoire of human antibodies in the absence of endogenous immunoglobulin production.
  • J H antibody heavy-chain joining region
  • the transgenic mice are immunized in the normal fashion with a selected antigen, e.g. , all or a portion of PD-1 and TIM-3.
  • Monoclonal antibodies directed against the antigen can be obtained from the immunized, transgenic mice using conventional hybridoma technology.
  • the human immunoglobulin transgenes harbored by the transgenic mice rearrange during B cell differentiation, and subsequently undergo class switching and somatic mutation.
  • this technology for producing human antibodies see, Lonberg and Huszar, 1995, Int. Rev. Immunol. 13:65-93.
  • this technology for producing human antibodies and human monoclonal antibodies and protocols for producing such antibodies see, e.g.
  • V domain gene repertoires from unimmunized donors.
  • antibody V domain genes are cloned in-frame into either a major or minor coat protein gene of a filamentous bacteriophage, such as Ml 3 or fd, and displayed as functional antibody fragments on the surface of the phage particle. Because the filamentous particle contains a single - stranded DNA copy of the phage genome, selections based on the functional properties of the antibody also result in selection of the gene encoding the antibody exhibiting those properties. Thus, the phage mimics some of the properties of the B-cell.
  • Phage display can be performed in a variety of formats; for their review see, e.g., Johnson, Kevin S, and Chiswell, David J., Current Opinion in Structural Biology 3:564-571 (1993).
  • V-gene segments can be used for phage display.
  • Clackson et al Nature, 352:624-628 (1991) isolated a diverse array of anti-oxazolone antibodies from a small random combinatorial library of V genes derived from the spleens of immunized mice.
  • a repertoire of V genes from unimmunized human donors can be constructed and antibodies to a diverse array of antigens (including self-antigens) can be isolated essentially following the techniques described by Marks et al, J. Mol. Biol. 222:581-597 (1991), or Griffith et al, EMBO J. 12:725-734 (1993). See, also, U.S. Pat. Nos. 5,565,332 and 5,573,905.
  • Human antibodies can also be generated by in vitro activated B cells (see U.S. Pat.
  • Completely human antibodies which recognize a selected epitope can be generated using a technique referred to as "guided selection.”
  • a selected non-human monoclonal antibody e.g., a. mouse antibody
  • a completely human antibody recognizing the same epitope Jespers et al , 1994, Bio/technology 12:899-903.
  • the bispecific and multispecific antibodies to PD-1 or TIM-3 described herein can, in turn, be utilized to generate anti-idiotype antibodies that "mimic" proteins described herein using techniques well known to those skilled in the art. (See, e.g. Greenspan & Bona, 1989, FASEB J. 7(5):437-444; and Nissinoff. 1991, J. Immunol. 147(8):2429-243S).
  • Fab fragments of such anti-idiotypes can be used in therapeutic regimens to elicit an individual's own immune response against PD-1 or TIM-3 present on activated lymphocytes.
  • the antibodies described herein can be fragmented using conventional techniques and the fragments screened for utility in the same manner as described above for the whole antibodies. Traditionally, these fragments were derived via proteolytic digestion of intact antibodies (see, e.g., Morimoto et al , Journal of Biochemical and Biophysical Methods 24: 107-117 (1992) and Brennan et al. , Science, 229:81 (1985)).
  • Fab and F(ab') 2 fragments of the bispecific and multispecific antibodies described herein can be produced by proteolytic cleavage of immunoglobulin molecules, using enzymes such as papain (to produce Fab fragments) or pepsin (to produce F(ab') 2 fragments).
  • F(ab') 2 fragments contain the variable region, the light chain constant region and the C H 1 domain of the heavy chain. However, these fragments can now be produced directly by recombinant host cells.
  • the antibody fragments can be isolated from the antibody phage libraries discussed above.
  • Fab'-SH fragments can be directly recovered from E. coli and chemically coupled to form F(ab') 2 fragments (Carter et al , Bio/Technology 10: 163-167 (1992)).
  • F(ab') 2 fragments can be isolated directly from recombinant host cell culture. Other techniques for the production of antibody fragments will be apparent to the skilled practitioner.
  • the antibody of choice is a single chain Fv fragment (scFv). See WO 93/16185.
  • amino acid sequence modification(s) of the antibodies or antibody fragments described herein are contemplated.
  • Amino acid sequence variants of the antibody are prepared by introducing appropriate nucleotide changes into the antibody nucleic acid, or by peptide synthesis.
  • Such modifications include, for example, deletions from, and/or insertions into and/or substitutions of, residues within the amino acid sequences of the antibody. Any combination of deletion, insertion, and substitution is made to arrive at the final construct, provided that the final construct possesses the desired characteristics, e.g., specifically binds to PD-1 and TIM-3.
  • the amino acid changes also can alter post-translational processes of the antibody, such as changing the number or position of glycosylation sites.
  • a useful method for identification of certain residues or regions of the antibody that are preferred locations for mutagenesis is called "alanine scanning mutagenesis" as described by Cunningham and Wells Science, 244: 1081-1085 (1989).
  • a residue or group of target residues are identified ⁇ e.g., charged residues such as arg, asp, his, lys, and glu) and replaced by a neutral or negatively charged amino acid (most preferably alanine or polyalanine) to affect the interaction of the amino acids with antigen.
  • Those amino acid locations demonstrating functional sensitivity to the substitutions then are refined by introducing further or other variants at, or for, the sites of substitution.
  • the site for introducing an amino acid sequence variation is predetermined, the nature of the mutation per se need not be predetermined. For example, to analyze the performance of a mutation at a given site, ala scanning or random mutagenesis is conducted at the target codon or region and the expressed antibody variants are screened for the desired activity.
  • Amino acid sequence insertions include amino- and/or carboxyl-terminal fusions ranging in length from one residue to polypeptides containing a hundred or more residues, as well as intrasequence insertions of single or multiple amino acid residues.
  • terminal insertions include antibodies with an N-terminal methionyl residue, or the antibody fused to a cytotoxic polypeptide.
  • Other insertional variants of the antibody molecule include the fusion to the N- or C- terminus of the antibody to an enzyme (e.g. for ADEPT) or a polypeptide which increases the serum half-life of the antibody.
  • variants are an amino acid substitution variant. These variants have at least one amino acid residue in the antibody molecule replaced by a different residue.
  • the sites of greatest interest for substitutional mutagenesis include the hypervariable regions, but FR alterations are also contemplated.
  • Substantial modifications in the biological properties of the antibodies or antibody fragments thereof described herein are accomplished by selecting substitutions that differ significantly in their effect on maintaining (a) the structure of the polypeptide backbone in the area of the substitution, for example, as a sheet or helical conformation, (b) the charge or hydrophobicity of the molecule at the target site, or (c) the bulk of the side chain.
  • Amino acids can be grouped according to similarities in the properties of their side chains (in A. L. Lehninger, in Biochemistry, second ed., pp.
  • Naturally occurring residues can be divided into groups based on common side-chain properties: (1) hydrophobic: Norleucine, Met, Ala, Val, Leu, He; (2) neutral hydrophilic: Cys, Ser, Thr, Asn, Gin; (3) acidic: Asp, Glu; (4) basic: His, Lys, Arg; (5) residues that influence chain orientation: Gly, Pro; (6) aromatic: Trp, Tyr, Phe.
  • Non-conservative substitutions will entail exchanging a member of one of these classes for another class.
  • cysteine residue not involved in maintaining the proper conformation of the antibody also can be substituted, generally with serine, to improve the oxidative stability of the molecule and prevent aberrant crosslinking.
  • cysteine bond(s) can be added to the antibody to improve its stability (particularly where the antibody is an antibody fragment such as an Fv fragment).
  • a particularly preferred type of substitutional variant involves substituting one or more hypervariable region residues of the parent antibody or antibody fragment thereof described herein (e.g. a humanized or human antibody).
  • the resulting variant(s) selected for further development will have improved biological properties relative to the parent antibody from which they are generated.
  • a convenient way for generating such substitutional variants involves affinity maturation using phage display. Briefly, several hypervariable region sites (e.g. 6-7 sites) are mutated to generate all possible amino substitutions at each site.
  • the antibody variants thus generated are displayed in a monovalent fashion from filamentous phage particles as fusions to the gene III product of Ml 3 packaged within each particle.
  • the phage-displayed variants are then screened for their biological activity (e.g. binding affinity) as herein disclosed.
  • biological activity e.g. binding affinity
  • alanine scanning mutagenesis can be performed to identify hypervariable region residues contributing significantly to antigen binding.
  • Another type of amino acid variant of the antibodies or antibody fragments thereof described herein alters the original glycosylation pattern of the antibody. By altering is meant deleting one or more carbohydrate moieties found in the antibody, and/or adding one or more glycosylation sites that are not present in the antibody.
  • N-linked refers to the attachment of the carbohydrate moiety to the side chain of an asparagine residue.
  • the tripeptide sequences asparagine -X-serine and asparagine -X-threonine, where X is any amino acid except proline, are the recognition sequences for enzymatic attachment of the carbohydrate moiety to the asparagine side chain.
  • X is any amino acid except proline
  • O-linked glycosylation refers to the attachment of one of the sugars N- aceylgalactosamine, galactose, or xylose to a hydroxyamino acid, most commonly serine or threonine, although 5-hydroxyproline or 5-hydroxylysine can also be used.
  • glycosylation sites to the antibodies or antibody fragments thereof described herein is conveniently accomplished by altering the amino acid sequence such that it contains one or more of the above-described tripeptide sequences (for N-linked glycosylation sites).
  • the alteration can also be made by the addition of, or substitution by, one or more serine or threonine residues to the sequence of the original antibody (for O-linked glycosylation sites).
  • the carbohydrate attached thereto can be altered.
  • antibodies with a mature carbohydrate structure that lacks fucose attached to an Fc region of the antibody are described in US Pat Appl No US 2003/0157108 Al, Presta, L. See also US 2004/0093621 Al (Kyowa Hakko Kogyo Co., Ltd).
  • Antibodies with a bisecting N-acetylglucosamine (GlcNAc) in the carbohydrate attached to an Fc region of the antibody are referenced in WO03/011878, Jean-Mairet et al. and U.S. Pat. No. 6,602,684, Umana et al.
  • Antibodies with at least one galactose residue in the oligosaccharide attached to an Fc region of the antibody are reported in WO97/30087, Patel et al. See, also, W098/58964 (Raju, S.) and W099/22764 (Raju, S.) concerning antibodies with altered carbohydrate attached to the Fc region thereof.
  • ADCC antigen-dependent cell-mediated cyotoxicity
  • CDC complement dependent cytotoxicity
  • Homodimeric antibodies with enhanced anti-tumor activity can also be prepared using heterobifunctional cross- linkers as described in Wolff et al. Cancer Research 53:2560-2565 (1993).
  • an antibody can be engineered which has dual Fc regions and can thereby have enhanced complement lysis and ADCC capabilities. See Stevenson et al. Anti-Cancer Drug Design 3:219-230 (1989).
  • WO00/42072 (Presta, L.) describes antibodies with improved ADCC function in the presence of human effector cells, where the antibodies comprise amino acid substitutions in the Fc region thereof.
  • the antibody with improved ADCC comprises substitutions at positions 298, 333, and/or 334 of the Fc region (Eu numbering of residues).
  • the altered Fc region is a human IgGl Fc region comprising or consisting of substitutions at one, two or three of these positions. Such substitutions are optionally combined with substitution(s) which increase Clq binding and/or CDC.
  • the antibodies comprise an amino acid substitution at one or more of amino acid positions 270, 322, 326, 327, 329, 313, 333 and/or 334 of the Fc region thereof (Eu numbering of residues).
  • a salvage receptor binding epitope refers to an epitope of the Fc region of an IgG molecule ⁇ e.g. , IgGi, IgG 2 , IgG 3 , or IgG 4 ) that is responsible for increasing the in vivo serum half-life of the IgG molecule.
  • Antibodies with improved binding to the neonatal Fc receptor (FcRn), and increased half-lives are described in WO00/42072 (Presta, L.) and US2005/0014934A1 (Hinton et al). These antibodies comprise an Fc region with one or more substitutions therein which improve binding of the Fc region to FcRn.
  • the Fc region can have substitutions at one or more of positions 238, 250, 256, 265, 272, 286, 303, 305, 307, 311, 312, 314, 317, 340, 356, 360, 362, 376, 378, 380, 382, 413, 424, 428 or 434 (Eu numbering of residues).
  • the preferred Fc region-comprising antibody variant with improved FcRn binding comprises amino acid substitutions at one, two or three of positions 307, 380 and 434 of the Fc region thereof (Eu numbering of residues).
  • the antibody has 307/434 mutations.
  • Nucleic acid molecules encoding amino acid sequence variants of the antibody or antibody fragment thereof described herein are prepared by a variety of methods known in the art. These methods include, but are not limited to, isolation from a natural source (in the case of naturally occurring amino acid sequence variants) or preparation by oligonucleotide-mediated (or site-directed) mutagenesis, PCR mutagenesis, and cassette mutagenesis of an earlier prepared variant or a non- variant version of the antibody.
  • Certain aspects described herein are based, in part, on the discovery by the inventors that CD8+ T cells in a state of functional exhaustion, such as those found infiltrating a tumor site, co- express the inhibitory receptors PD-1 and TIM-3.
  • the inventors found that TIM-3 expressing immune cells can further be sub-divided into TIM-3 10 and TIM-3 hi expressing cells.
  • the inventors also found that the co-expression of PD-1 and TIM-3 on immune cells, such as CD8 T cells, can be restricted to or increased in a specific microenvironment, such as a tumor microenvironment, relative to other lymphoid tissue compartments.
  • the data described herein demonstrate that PD-1 alone is an imperfect marker of immune cell functional exhaustion, as it was found that PD-1 single positive ⁇ i.e. , PD-l + TIM-3 " ) CD8 cells infiltrating a tumor site included bonafide effector T cells that produced IFNy, and were not functionally exhausted, and contained the highest frequency of IFNy producing cells, even higher than the PD -l im-3 " TILs.
  • bispecific and multispecific polypeptide agents described herein such as bispecific and multispecific antibodies and antibody fragments thereof, that can be used for co-targeting cells expressing both PD-1 and TIM-3, and methods using these agents, provide a novel means by which immune responses can be restored and/or initiated during chronic immune conditions characterized by functionally exhausted cells.
  • kits for the treatment of chronic immune conditions such as cancer and persistent infections, in a subject in need thereof.
  • Some of these methods involve administering to a subject a therapeutically effective amount of one of the bispecific or multispecific polypeptide agents described herein.
  • These methods are particularly aimed at therapeutic treatments of human subjects having a condition in which one or more immune cell populations, such as a CD8+ T cell population or a CD4+ T cell population, are functionally exhausted.
  • a method for the treatment of a chronic immune condition in a subject in need thereof comprising administering to a subject an effective amount of a multispecific polypeptide agent, wherein the multispecific polypeptide agent comprises at least one polypeptide domain that comprises a binding site that specifically binds to a PD-1 molecule, and at least one polypeptide domain that comprises a binding site that specifically binds to a TIM-3 molecule.
  • the multispecific polypeptide agent is a multispecific antibody or multispecific antibody-fragment thereof.
  • a method for the treatment of a chronic immune condition in a subject in need thereof comprising administering to a subject an effective amount of a bispecific polypeptide agent, wherein the bispecific polypeptide agent comprises one polypeptide domain that comprises a binding site that specifically binds to a PD-1 molecule, and one polypeptide domain that comprises a binding site that specifically binds to a TIM-3 molecule.
  • the bispecific polypeptide agent is a bispecific antibody or bispecific antibody-fragment thereof.
  • the PD-1 molecule has the sequence set forth in SEQ ID NO: l, or is an allelic or splice variant of SEQ ID NO: l.
  • the TIM-3 molecule has the sequence set forth in SEQ ID NO:2, or is an allelic or splice variant of SEQ ID NO:2.
  • the binding sites of the multispecific and bispecific polypeptide agents are directed against a ligand interaction site. In other embodiments of the aspects described herein, the binding sites of the multispecific and bispecific polypeptide agents are directed against a site in the proximity of a ligand interaction site, such that the agent sterically hinders the interaction of the PD-1 or TIM-3 target with a ligand.
  • the binding site of the bispecific or multispecific polypeptide agent being administered to the subject as described herein is directed against the ligand interaction site on PD-1, such that the interaction of PD-1 with PD-L1 is modulated, and in particular inhibited or prevented.
  • the binding site of the bispecific or multispecific polypeptide agent is directed against the ligand interaction site on PD-1 such that the interaction of PD-1 with PD-L2 is modulated, and in particular inhibited or prevented.
  • the binding site of the bispecific or multispecific polypeptide agent is directed against both the ligand interaction site on PD-1, such that the interaction of PD-1 with PD-L1 is modulated, and in particular inhibited or prevented, and the ligand interaction site on PD-1 such that the interaction of PD-1 with PD-L2 is modulated, and in particular inhibited or prevented.
  • the bispecific or multispecific polypeptide agent being administered to the subject is directed against the ligand interaction site on PD-1 such that the interaction of PD-1 with PD-L1 is modulated, and in particular inhibited or prevented, while the interaction of PD-1 with PD-L2 is not modulated, inhibited, or prevented.
  • the bispecific or multispecific polypeptide agent is directed against the ligand interaction site on PD-1 such that the interaction of PD-1 with PD- L2 is modulated, and in particular inhibited or prevented, while the interaction of PD-1 with PD-L1 is not modulated, inhibited or prevented.
  • the ligand interaction site of PD-1 comprises amino acid residues 41-136 of SEQ ID NO: l.
  • the ligand interaction site on PD-1 comprises any of the amino acid residues selected from the group consisting of amino acids 64, 66, 68, 73, 74, 75, 76, 78, 90, 122, 124, 126, 128, 130, 131, 132, 134, and 136 of SEQ ID NO: l.
  • the ligand interaction site on PD-1 comprises any of the amino acid residues selected from the group consisting of amino acids 78, 126, and 136 of SEQ ID NO: l.
  • the ligand interaction site on PD-1 comprises the group consisting of amino acids 78, 126, and 136 of SEQ ID NO: l.
  • the binding site of the bispecific or multispecific polypeptide agent being administered to the subject as described herein is directed against the ligand interaction site on TIM-3 such that the interaction of TIM-3 with galectin-9 is modulated, and in particular inhibited or prevented.
  • the binding site of the bispecific and multispecific polypeptide agent is directed against the ligand interaction site on TIM-3 such that the interaction of TIM-3 with phosphatidylserine is modulated, and in particular inhibited or prevented.
  • the binding site of the bispecific and multispecific polypeptide agent is directed against both the ligand interaction sites on TIM-3, such that the interaction of TIM-3 with galectin-9 is modulated, and in particular inhibited or prevented, and the interaction of TIM-3 with phosphatidylserine is modulated, and in particular inhibited or prevented.
  • the binding site of the bispecific and multispecific polypeptide agent as described herein is directed against the ligand interaction site on TIM-3 such that the interaction of TIM-3 with galectin-9 is modulated, and in particular inhibited or prevented, while the interaction of TIM-3 with
  • the binding site of the bispecific and multispecific polypeptide agent is directed against the ligand interaction site on TIM-3 such that the interaction of TIM-3 with phosphatidylserine is modulated, and in particular inhibited or prevented, while the interaction of TIM-3 with galectin-9 is not modulated, inhibited or prevented.
  • the ligand interaction site of TIM-3 comprises amino acid residues 24-131 of SEQ ID NO:2.
  • the ligand interaction site on TIM-3 comprises any of the amino acid residues selected from the group consisting of amino acids 50, 62, 69, 112, and 121 of SEQ ID NO:2.
  • a ligand interaction site on PD-1 comprises any of the amino acid residues selected from the group consisting of amino acids 44, 74, and 100 of SEQ ID NO:2.
  • subject and “individual” are used interchangeably herein, and refer to an animal, for example a human, recipient of the bispecific or multispecific polypeptide agents described herein.
  • subject refers to that specific animal.
  • non-human animals and “non-human mammals” are used interchangeably herein, and include mammals such as rats, mice, rabbits, sheep, cats, dogs, cows, pigs, and non-human primates.
  • subject also encompasses any vertebrate including but not limited to mammals, reptiles, amphibians and fish.
  • the subject is a mammal such as a human, or other mammals such as a domesticated mammal, e.g. dog, cat, horse, and the like, or production mammal, e.g. cow, sheep, pig, and the like are also known.
  • a mammal such as a human
  • other mammals such as a domesticated mammal, e.g. dog, cat, horse, and the like, or production mammal, e.g. cow, sheep, pig, and the like are also.
  • bispecific or multispecific polypeptide agents described herein can be any bispecific or multispecific polypeptide agents described herein.
  • administering and “introducing” are used interchangeably and refer to the placement of a bispecific or multispecific polypeptide agent into a subject by a method or route which results in at least partial localization of such agents at a desired site, such as a site of inflammation, such that a desired effect(s) is produced.
  • any mode of administration that delivers the agent systemically or to a desired surface or target can include, but is not limited to, injection, infusion, instillation, and inhalation administration.
  • any mode of administration that delivers the agent systemically or to a desired surface or target, and can include, but is not limited to, injection, infusion, instillation, and inhalation administration.
  • oral administration forms are also contemplated.
  • injection includes, without limitation, intravenous, intramuscular, intraarterial, intrathecal, intraventricular, intracapsular, intraorbital, intracardiac, intradermal, intraperitoneal, transtracheal, subcutaneous, subcuticular, intraarticular, sub capsular, subarachnoid, intraspinal, intracerebro spinal, and intrasternal injection and infusion.
  • the bispecific or multispecific polypeptide agents for use in the methods described herein are administered by intravenous infusion or injection.
  • parenteral administration and “administered parenterally” as used herein, refer to modes of administration other than enteral and topical administration, usually by injection.
  • systemic administration refers to the administration of the bispecific or multispecific polypeptide agent other than directly into a target site, tissue, or organ, such as a tumor site, such that it enters the subject's circulatory system and, thus, is subject to metabolism and other like processes.
  • administration of the bispecific or multispecific polypeptide agents can include formulation into pharmaceutical compositions or pharmaceutical formulations for parenteral administration, e.g., intravenous; mucosal, e.g. , intranasal; ocular, or other mode of administration.
  • the bispecific or multispecific polypeptide agents described herein can be administered along with any pharmaceutically acceptable carrier compound, material, or composition which results in an effective treatment in the subject.
  • a pharmaceutical formulation for use in the methods described herein can contain a bispecific or multispecific polypeptide agent as described herein in combination with one or more
  • phrases "pharmaceutically acceptable” refers to those compounds, materials, compositions, and/or dosage forms which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of human beings and animals without excessive toxicity, irritation, allergic response, or other problem or complication, commensurate with a reasonable benefit/risk ratio.
  • pharmaceutically acceptable carrier means a pharmaceutically acceptable material, composition or vehicle, such as a liquid or solid filler, diluent, excipient, solvent, media, encapsulating material, manufacturing aid (e.g., lubricant, talc magnesium, calcium or zinc stearate, or steric acid), or solvent encapsulating material, involved in maintaining the stability, solubility, or activity of , a bispecific or multispecific polypeptide agent.
  • manufacturing aid e.g., lubricant, talc magnesium, calcium or zinc stearate, or steric acid
  • solvent encapsulating material involved in maintaining the stability, solubility, or activity of , a bispecific or multispecific polypeptide agent.
  • Each carrier must be “acceptable” in the sense of being compatible with the other ingredients of the formulation and not injurious to the patient.
  • materials which can serve as pharmaceutically-acceptable carriers include: (1) sugars, such as lactose, glucose and sucrose; (2) starches, such as corn starch and potato starch; (3) cellulose, and its derivatives, such as sodium carboxymethyl cellulose, methylcellulose, ethyl cellulose, microcrystalline cellulose and cellulose acetate; (4) powdered tragacanth; (5) malt; (6) gelatin; (7) excipients, such as cocoa butter and suppository waxes; (8) oils, such as peanut oil, cottonseed oil, safflower oil, sesame oil, olive oil, corn oil and soybean oil; (9) glycols, such as propylene glycol; (10) polyols, such as glycerin, sorbitol, mannitol and polyethylene glycol (PEG); (11) esters, such as ethyl oleate and ethyl laurate; (12) agar; (13) buffering agents, such as magnesium hydro
  • poly anhydrides (21) bulking agents, such as polypeptides and amino acids (22) serum components, such as serum albumin, HDL and LDL; (23) C2-C12 alchols, such as ethanol; and (24) other nontoxic compatible substances employed in pharmaceutical formulations. Release agents, coating agents, preservatives, and antioxidants can also be present in the formulation.
  • the terms such as “excipient”, “carrier”, “pharmaceutically acceptable carrier” or the like are used interchangeably herein.
  • the bispecific or multispecific polypeptide agents described herein can be specially formulated for administration of the compound to a subject in solid, liquid or gel form, including those adapted for the following: (1) parenteral administration, for example, by subcutaneous, intramuscular, intravenous or epidural injection as, for example, a sterile solution or suspension, or sustained-release formulation; (2) topical application, for example, as a cream, ointment, or a controlled-release patch or spray applied to the skin; (3) intravaginally or intrarectally, for example, as a pessary, cream or foam; (4) ocularly; (5) transdermally; (6) transmucosally; or (79) nasally.
  • parenteral administration for example, by subcutaneous, intramuscular, intravenous or epidural injection as, for example, a sterile solution or suspension, or sustained-release formulation
  • topical application for example, as a cream, ointment, or a controlled-release patch or spray applied to the skin
  • a bispecific or multispecific polypeptide agent can be implanted into a patient or injected using a drug delivery system. See, for example, Urquhart, et al , Ann. Rev. Pharmacol. Toxicol. 24: 199-236 (1984); Lewis, ed. "Controlled Release of Pesticides and Pharmaceuticals” (Plenum Press, New York, 1981); U.S. Pat. No. 3,773,919; and U.S. Pat. No. 35 3,270,960.
  • Parenteral dosage forms of the bispecific or multispecific polypeptide agents can also be administered to a subject with a chronic immune condition by various routes, including, but not limited to, subcutaneous, intravenous (including bolus injection), intramuscular, and intraarterial. Since administration of parenteral dosage forms typically bypasses the patient's natural defenses against contaminants, parenteral dosage forms are preferably sterile or capable of being sterilized prior to administration to a patient. Examples of parenteral dosage forms include, but are not limited to, solutions ready for injection, dry products ready to be dissolved or suspended in a pharmaceutically acceptable vehicle for injection, suspensions ready for injection, controlled-release parenteral dosage forms, and emulsions.
  • Suitable vehicles that can be used to provide parenteral dosage forms of the disclosure are well known to those skilled in the art. Examples include, without limitation: sterile water; water for injection USP; saline solution; glucose solution; aqueous vehicles such as but not limited to, sodium chloride injection, Ringer's injection, dextrose Injection, dextrose and sodium chloride injection, and lactated Ringer's injection; water-miscible vehicles such as, but not limited to, ethyl alcohol, polyethylene glycol, and propylene glycol; and non-aqueous vehicles such as, but not limited to, corn oil, cottonseed oil, peanut oil, sesame oil, ethyl oleate, isopropyl myristate, and benzyl benzoate.
  • a bispecific or multispecific polypeptide agent can be packaged in a pressurized aerosol container together with suitable propellants, for example, hydrocarbon propellants like propane, butane, or isobutane with conventional adjuvants.
  • suitable propellants for example, hydrocarbon propellants like propane, butane, or isobutane with conventional adjuvants.
  • a bispecific or multispecific polypeptide agent can also be administered in a non-pressurized form such as in a nebulizer or atomizer.
  • a bispecific or multispecific polypeptide agent can also be administered directly to the airways in the form of a dry powder, for example, by use of an inhaler.
  • Suitable powder compositions include, by way of illustration, powdered preparations of a bispecific or multispecific polypeptide agent thoroughly intermixed with lactose, or other inert powders acceptable for intrabronchial administration.
  • the powder compositions can be administered via an aerosol dispenser or encased in a breakable capsule which can be inserted by the subject into a device that punctures the capsule and blows the powder out in a steady stream suitable for inhalation.
  • the compositions can include propellants, surfactants, and co-solvents and can be filled into conventional aerosol containers that are closed by a suitable metering valve.
  • Aerosols for the delivery to the respiratory tract are known in the art. See for example, Adjei, A. and Garren, J. Pharm. Res., 1 : 565-569 (1990); Zanen, P. and Lamm, J.-W. J. Int. J. Pharm., 114: 111-115 (1995); Gonda, I. "Aerosols for delivery of therapeutic an diagnostic agents to the respiratory tract," in Critical Reviews in Therapeutic Drug Carrier Systems, 6:273-313 (1990); Anderson et al., Am. Rev. Respir.
  • the formulations of the bispecific or multispecific polypeptide agents described herein further encompass anhydrous pharmaceutical compositions and dosage forms comprising the disclosed compounds as active ingredients, since water can facilitate the degradation of some compounds.
  • water can facilitate the degradation of some compounds.
  • the addition of water ⁇ e.g. , 5% is widely accepted in the pharmaceutical arts as a means of simulating long-term storage in order to determine characteristics such as shelf life or the stability of formulations over time. See, e.g. , Jens T. Carstensen, Drug Stability: Principles & Practice, 379-80 (2nd ed., Marcel Dekker, NY, N.Y.: 1995).
  • Anhydrous pharmaceutical compositions and dosage forms of the disclosure can be prepared using anhydrous or low moisture containing ingredients and low moisture or low humidity conditions.
  • compositions and dosage forms that comprise lactose and at least one active ingredient that comprises a primary or secondary amine are preferably anhydrous if substantial contact with moisture and/or humidity during manufacturing, packaging, and/or storage is expected.
  • Anhydrous compositions are preferably packaged using materials known to prevent exposure to water such that they can be included in suitable formulary kits. Examples of suitable packaging include, but are not limited to, hermetically sealed foils, plastics, unit dose containers (e.g. , vials) with or without desiccants, blister packs, and strip packs.
  • a bispecific or multispecific polypeptide agent can be administered to a subject by controlled- or delayed-release means.
  • the use of an optimally designed controlled-release preparation in medical treatment is characterized by a minimum of drug substance being employed to cure or control the condition in a minimum amount of time.
  • Controlled-release formulations include: 1) extended activity of the drug; 2) reduced dosage frequency; 3) increased patient compliance; 4) usage of less total drug; 5) reduction in local or systemic side effects; 6) minimization of drug accumulation; 7) reduction in blood level fluctuations; 8) improvement in efficacy of treatment; 9) reduction of potentiation or loss of drug activity; and 10) improvement in speed of control of diseases or conditions.
  • Controlled-release formulations can be used to control a compound of formula (I)'s onset of action, duration of action, plasma levels within the therapeutic window, and peak blood levels.
  • controlled- or extended-release dosage forms or formulations can be used to ensure that the maximum effectiveness of a compound of formula (I) is achieved while minimizing potential adverse effects and safety concerns, which can occur both from under-dosing a drug (i.e., going below the minimum therapeutic levels) as well as exceeding the toxicity level for the drug.
  • a variety of known controlled- or extended-release dosage forms, formulations, and devices can be adapted for use with the bispecific or multispecific polypeptide agents described herein. Examples include, but are not limited to, those described in U.S. Pat. Nos.: 3,845,770; 3,916,899; 3,536,809; 3,598,123; 4,008,719; 5674,533; 5,059,595; 5,591 ,767; 5,120,548; 5,073,543; 5,639,476; 5,354,556; 5,733,566; and 6,365,185 Bl, each of which is incorporated herein by reference in their entireties.
  • dosage forms can be used to provide slow or controlled-release of one or more active ingredients using, for example, hydroxypropylmethyl cellulose, other polymer matrices, gels, permeable membranes, osmotic systems (such as OROS® (Alza Corporation, Mountain View, Calif. USA)), multilayer coatings, microparticles, liposomes, or microspheres or a combination thereof to provide the desired release profile in varying proportions.
  • ion exchange materials can be used to prepare immobilized, adsorbed salt forms of the disclosed compounds and thus effect controlled delivery of the drug. Examples of specific anion exchangers include, but are not limited to, Duolite® A568 and Duolite® AP143 (Rohm&Haas, Spring House, Pa. USA).
  • a bispecific or multispecific polypeptide agent for use in the methods described herein is administered to a subject by sustained release or in pulses.
  • Pulse therapy is not a form of discontinuous administration of the same amount of a composition over time, but comprises administration of the same dose of the composition at a reduced frequency or
  • Sustained release or pulse administrations are particularly preferred when the disorder occurs continuously in the subject, for example where the subject has continuous or chronic symptoms of a viral infection.
  • Each pulse dose can be reduced and the total amount of a bispecific or multispecific polypeptide agent administered over the course of treatment to the patient is minimized.
  • the interval between pulses when necessary, can be determined by one of ordinary skill in the art. Often, the interval between pulses can be calculated by administering another dose of the composition when the composition or the active component of the composition is no longer detectable in the subject prior to delivery of the next pulse. Intervals can also be calculated from the in vivo half -life of the composition. Intervals can be calculated as greater than the in vivo half -life, or 2, 3, 4, 5 and even 10 times greater the composition half-life.
  • Various methods and apparatus for pulsing compositions by infusion or other forms of delivery to the patient are disclosed in U.S. Pat. Nos. 4,747,825; 4,723,958; 4,948,592; 4,965,251 and 5,403,590.
  • Certain aspects of the methods described herein are based, in part, on the discovery by the inventors that co-targeting of the inhibitory receptors PD-1 and TIM-3 that are co-expressed by CD8+ T cells in a state of functional exhaustion, such as those found infiltrating a tumor site, can reverse the state of functional exhaustion and result in an effective immune response. Accordingly, the methods using the bispecific and multispecific polypeptide agents described herein are useful in the treatment of subjects having a chronic immune condition, such as a persistent infection or cancer, where an immune response is suppressed, insufficient, inhibited, or abrogated, due to functional exhaustion of a population of immune cells, such as CD8+ T cells.
  • a chronic immune condition such as a persistent infection or cancer
  • These methods provide specific targeting of cells to be activated, i.e, only those cells co-expressing both TIM-3 and PD-1, and prevent the unwanted or undesired activation of single -positive cells, cells that are not functionally exhausted, and cells that are pathogenic upon activation, e.g., self-reactive cells.
  • Immunosuppression of a host immune response plays a role in a variety of chronic immune conditions, such as in persistent infection and tumor immunosuppression. Recent evidence indicates that this immunosuppression can be mediated by immune inhibitory receptors expressed on the surface of an immune cell, and their interactions with their ligands. For example, cytotoxic CD8 T cells can enter a state of "functional exhaustion,” or “unresponsiveness” whereby they express inhibitory receptors that prevent antigen-specific responses, such as proliferation and cytokine production. Accordingly, by inhibiting the activity and/or expression of such inhibitory receptors, an immune response to a persistent infection or to a cancer or tumor that is suppressed, inhibited, or unresponsive, can be enhanced or uninhibited.
  • an "immune response” refers to a response by a cell of the immune system, such as a B cell, T cell (CD4 or CD8), regulatory T cell, antigen-presenting cell, dendritic cell, monocyte, macrophage, NKT cell, NK cell, basophil, eosinophil, or neutrophil, to a stimulus.
  • the response is specific for a particular antigen (an "antigen-specific response”), and refers to a response by a CD4 T cell, CD8 T cell, or B cell via their antigen-specific receptor.
  • an immune response is a T cell response, such as a CD4+ response or a CD8+ response.
  • Such responses by these cells can include, for example, cytotoxicity, proliferation, cytokine or chemokine production, trafficking, or phagocytosis, and can be dependent on the nature of the immune cell undergoing the response.
  • unresponsiveness or “functional exhaustion” with regard to immune cells includes refractivity of immune cells to stimulation, such as stimulation via an activating receptor or a cytokine. Unresponsiveness can occur, for example, because of exposure to immunosuppressants, exposure to high or constant doses of antigen, or through the activity of inhibitor receptors, such as PD-1 or TIM-3. As used herein, the term “unresponsiveness” includes refractivity to activating receptor-mediated stimulation. Such refractivity is generally antigen-specific and persists after exposure to the antigen has ceased.
  • Unresponsive immune cells can have a reduction of at least 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, or even 100% in cytotoxic activity, cytokine production, proliferation, trafficking, phagocytotic activity, or any combination thereof, relative to a corresponding control immune cell of the same type.
  • Persistent infections refer to those infections that, in contrast to acute infections, are not effectively cleared by the induction of a host immune response. During such persistent infections, the infectious agent and the immune response reach equilibrium such that the infected subject remains infectious over a long period of time without necessarily expressing symptoms. Persistent infections often involve stages of both silent and productive infection without rapidly killing or even producing excessive damage of the host cells. Persistent infections include for example, latent, chronic and slow infections.
  • Persistent infection occurs with viruses including, but not limited to, human T-Cell leukemia viruses, Epstein-Barr virus, cytomegalovirus, herpesviruses, varicella-zoster virus, measles, papovaviruses, prions, hepatitis viruses, adenoviruses, parvoviruses and papillomaviruses.
  • viruses including, but not limited to, human T-Cell leukemia viruses, Epstein-Barr virus, cytomegalovirus, herpesviruses, varicella-zoster virus, measles, papovaviruses, prions, hepatitis viruses, adenoviruses, parvoviruses and papillomaviruses.
  • the infectious agent in a "chronic infection,” the infectious agent can be detected in the subject at all times.
  • Non-limiting examples of chronic infection include hepatitis B (caused by heptatitis B virus (HBV)) and hepatitis C (caused by hepatitis C virus (HCV)) adenovirus, cytomegalovirus, Epstein- Barr virus, herpes simplex virus 1, herpes simplex virus 2, human herpesvirus 6, varicella-zoster virus, hepatitis B virus, hepatitis D virus, papilloma virus, parvovirus B19, polyoma virus BK, polyoma virus JC, measles virus, rubella virus, human immunodeficiency virus (HIV), human T cell leukemia virus I, and human T cell leukemia virus II.
  • Parasitic persistent infections can arise as a result of infection by, for example, Leishmania, Toxoplasma, Trypanosoma, Plasmodium, Schistosoma,
  • latent infection the infectious agent (such as a virus) is seemingly inactive and dormant such that the subject does not always exhibit signs or symptoms.
  • a latent viral infection the virus remains in equilibrium with the host for long periods of time before symptoms again appear; however, the actual viruses cannot typically be detected until reactivation of the disease occurs.
  • latent infections include infections caused by herpes simplex virus (HSV)-l (fever blisters), HSV-2 (genital herpes), and varicella zoster virus VZV (chickenpox-shingles).
  • slow infection the infectious agents gradually increase in number over a very long period of time during which no significant signs or symptoms are observed.
  • Non-limiting examples of slow infections include AIDS (caused by HIV-1 and HIV -2), lenti viruses that cause tumors in animals, and prions.
  • persistent infections that can be treated using the methods described herein include those infections that often arise as late complications of acute infections.
  • SSPE subacute sclerosing panencephalitis
  • regressive encephalitis can occur as a result of a rubella infection.
  • the mechanisms by which persistent infections are maintained can involve modulation of virus and cellular gene expression and modification of the host immune response.
  • Reactivation of a latent infection can be triggered by various stimuli, including changes in cell physiology, superinfection by another virus, and physical stress or trauma. Host immunosuppression is often associated with reactivation of a number of persistent virus infections.
  • Retroviridae for example, polio viruses, hepatitis A virus; enteroviruses, human coxsackie viruses, rhinoviruses, echo viruses); Calciviridae (such as strains that cause gastroenteritis); Togaviridae (for example, equine encephalitis viruses, rubella viruses); Flaviridae (for example, dengue viruses, encephalitis viruses, yellow fever viruses); Coronaviridae (for example, coronaviruses); Rhabdoviridae (for example, vesicular stomatitis viruses, rabies viruses); Filoviridae (for example, ebola viruses);
  • Paramyxoviridae for example, parainfluenza viruses, mumps virus, measles virus, respiratory syncytial virus
  • Orthomyxoviridae for example, influenza viruses
  • Bungaviridae for example, Hantaan viruses, bunga viruses, phleboviruses and Nairo viruses
  • Arena viridae hemorrhagic fever viruses
  • Reoviridae ⁇ e.g., reoviruses, orbiviurses and rotaviruses
  • Birnaviridae Hepadnaviridae (Hepatitis B virus); Parvoviridae (parvoviruses); Papovaviridae (papilloma viruses, polyoma viruses); Adenoviridae (most adenoviruses); Herpesviridae (herpes simplex virus (HSV) 1 and HSV-2, varicella zoster virus, cytomegalovirus (CMV), herpes viruses);
  • fungal infections include but are not limited to: aspergillosis; thrush
  • infectious fungi include, but are not limited to, Cryptococcus neoformans, Histoplasma capsulatum, Coccidioides immitis, Blastomyces dermatitidis, Chlamydia trachomatis, Candida albicans.
  • the compositions and methods described herein are contemplated for use in treating infections with these fungal agents.
  • infectious bacteria examples include: Helicobacterpyloris, Borelia burgdorferi,
  • Legionella pneumophilia Mycobacteria sps (such as M. tuberculosis, M. avium, M. intracellulare, M. kansaii, M. gordonae), Staphylococcus aureus, Neisseria gonorrhoeae, Neisseria meningitidis, Listeria monocytogenes, Streptococcus pyogenes (Group A Streptococcus), Streptococcus agalactiae (Group B Streptococcus), Streptococcus (viridans group), Streptococcus faecalis, Streptococcus bovis, Streptococcus (anaerobic sps.), Streptococcus pneumoniae, pathogenic Campylobacter sp.,
  • Mycobacteria sps such as M. tuberculosis, M. avium, M. intracellulare, M
  • Enterococcus sp. Haemophilus influenzae, Bacillus anthracis, corynebacterium diphtheriae, corynebacterium sp., Erysipelothrix rhusiopathiae, Clostridium perfringens, Clostridium tetani, Enterobacter aerogenes, Klebsiella pneumoniae, Pasturella multocida, Bacteroides sp.,
  • compositions and methods described herein are contemplated for use in treating infections with these agents.
  • the methods further comprise administering an effective amount of a viral, bacterial, fungal, or parasitic antigen in conjunction with the bispecific or multispecific polypeptide agent that specifically binds PD-1 and TIM-3.
  • Non-limiting examples of suitable viral antigens include: influenza HA, NA, M, NP and NS antigens; HIV p24, pol, gp41 and gpl20; Metapneumo virus (hMNV) F and G proteins; Hepatitis C virus (HCV) El, E2 and core proteins; Dengue virus (DEN 1-4) El, E2 and core proteins; Human Papilloma Virus LI protein; Epstein Barr Virus gp220/350 and EBNA-3A peptide; Cytomegalovirus (CMV) gB glycoprotein, gH glycoprotein, pp65, IE1 (exon 4) and pp 150; Varicella Zoster virus (VZV) IE62 peptide and glycoprotein E epitopes; Herpes Simplex Virus Glycoprotein D epitopes, among many others.
  • the antigenic polypeptides can correspond to polypeptides of naturally occurring animal or human viral isolates, or can be engineered to incorporate one or more
  • the subject having a chronic immune condition being administered the bispecific or multispecific polypeptide agent that specifically binds PD-1 and TIM-3 has a cancer or tumor.
  • tumor cells can co-express the ligands for the inhibitory ligands PD-1 and TIM-3, such that tumor infiltrating T cells expressing PD-1 and TIM-3 are in a state of functional exhaustion or unresponsiveness due to the inhibitory signals mediated by these receptors.
  • a method to treat a subject having a cancer or tumor comprising administering an effective amount of a bispecific or multispecific polypeptide agent that is specific for PD-1 and TIM-3.
  • a "cancer” or “tumor” as used herein refers to an uncontrolled growth of cells which interferes with the normal functioning of the bodily organs and systems.
  • a subject that has a cancer or a tumor is a subject having objectively measurable cancer cells present in the subject's body. Included in this definition are benign and malignant cancers, as well as dormant tumors or micrometastatses. Cancers which migrate from their original location and seed vital organs can eventually lead to the death of the subject through the functional deterioration of the affected organs.
  • Hemopoietic cancers such as leukemia, are able to out-compete the normal hemopoietic compartments in a subject, thereby leading to hemopoietic failure (in the form of anemia, thrombocytopenia and neutropenia) ultimately causing death.
  • Metastasis is meant the spread of cancer from its primary site to other places in the body. Cancer cells can break away from a primary tumor, penetrate into lymphatic and blood vessels, circulate through the bloodstream, and grow in a distant focus (metastasize) in normal tissues elsewhere in the body. Metastasis can be local or distant. Metastasis is a sequential process, contingent on tumor cells breaking off from the primary tumor, traveling through the bloodstream, and stopping at a distant site. At the new site, the cells establish a blood supply and can grow to form a life -threatening mass. Both stimulatory and inhibitory molecular pathways within the tumor cell regulate this behavior, and interactions between the tumor cell and host cells in the distant site are also significant.
  • Metastases are most often detected through the sole or combined use of magnetic resonance imaging (MRI) scans, computed tomography (CT) scans, blood and platelet counts, liver function studies, chest X-rays and bone scans in addition to the monitoring of specific symptoms.
  • MRI magnetic resonance imaging
  • CT computed tomography
  • liver function studies liver function studies
  • chest X-rays and bone scans in addition to the monitoring of specific symptoms.
  • cancers include but are not limited to, carcinoma, lymphoma, blastoma, sarcoma, and leukemia. More particular examples of such cancers include, but are not limited to, basal cell carcinoma, biliary tract cancer; bladder cancer; bone cancer; brain and CNS cancer; breast cancer; cancer of the peritoneum; cervical cancer; choriocarcinoma; colon and rectum cancer; connective tissue cancer; cancer of the digestive system; endometrial cancer; esophageal cancer; eye cancer; cancer of the head and neck; gastric cancer (including gastrointestinal cancer); glioblastoma; hepatic carcinoma; hepatoma; intra-epithelial neoplasm; kidney or renal cancer; larynx cancer; leukemia; liver cancer; lung cancer (e.g.
  • lymphoma including Hodgkin's and non-Hodgkin's lymphoma; melanoma; myeloma; neuroblastoma; oral cavity cancer (e.g. , lip, tongue, mouth, and pharynx); ovarian cancer; pancreatic cancer; prostate cancer; retinoblastoma; rhabdomyosarcoma; rectal cancer; cancer of the respiratory system; salivary gland carcinoma; sarcoma; skin cancer;
  • B-cell lymphoma including low grade/follicular non-Hodgkin's lymphoma (NHL); small lymphocytic (SL) NHL; intermediate grade/follicular NHL; intermediate grade diffuse NHL; high grade immunoblastic NHL; high grade lymphoblastic NHL; high grade small non-cleaved cell NHL; bulky disease NHL; mantle cell lymphoma; AIDS-related lymphoma; and Waldenstrom's
  • Macroglobulinemia may be used to determine whether abnormal vascular proliferation associated with phakomatoses, edema (such as that associated with brain tumors), and Meigs' syndrome.
  • CLL chronic lymphocytic leukemia
  • ALL acute lymphoblastic leukemia
  • PTLD post-transplant lymphoproliferative disorder
  • the methods further comprise admininstering a tumor or cancer antigen to a subject being administered the bispecific or multispecific polypeptide agent that is specific for PD-1 and TIM-3 decribed herein.
  • tumor antigens A number of tumor antigens have been identified that are associated with specific cancers.
  • cancer antigens are antigens which can potentially stimulate apparently tumor-specific immune responses. Some of these antigens are encoded, although not necessarily expressed, by normal cells. These antigens can be characterized as those which are normally silent (i.e. , not expressed) in normal cells, those that are expressed only at certain stages of differentiation and those that are temporally expressed such as embryonic and fetal antigens.
  • cancer antigens are encoded by mutant cellular genes, such as oncogenes (e.g. , activated ras oncogene), suppressor genes (e.g. , mutant p53), fusion proteins resulting from internal deletions or chromosomal translocations. Still other cancer antigens can be encoded by viral genes such as those carried on RNA and DNA tumor viruses. Many tumor antigens have been defined in terms of multiple solid tumors: MAGE 1 , 2, & 3, defined by immunity; MART-l/Melan-A, gplOO, carcinoembryonic antigen (CEA), HER-2, mucins (i.e.
  • MUC-1 prostate-specific antigen
  • PAP prostatic acid phosphatase
  • viral proteins such as hepatitis B (HBV), Epstein-Barr (EBV), and human papilloma (HPV) have been shown to be important in the development of hepatocellular carcinoma, lymphoma, and cervical cancer, respectively.
  • HBV hepatitis B
  • EBV Epstein-Barr
  • HPV human papilloma
  • the methods further comprise admininstering a chemotherapeutic agent to the subject being administered the bispecific or multispecific polypeptide agent that is specific for PD-1 and TIM-3.
  • chemotherapeutic agents can include alkylating agents such as thiotepa and CYTOXAN® cyclosphosphamide; alkyl sulfonates such as busulfan, improsulfan and piposulfan; aziridines such as benzodopa, carboquone, meturedopa, and uredopa; ethylenimines and methylamelamines including altretamine, triethylenemelamine, trietylenephosphoramide, triethiylenethiophosphoramide and trimethylolomelamine; acetogenins (especially bullatacin and bullatacinone); a camptothecin
  • calicheamicin especially calicheamicin gammall and calicheamicin omegall (see, e.g. , Agnew, Chem. Intl. Ed. Engl., 33: 183-186 (1994)); dynemicin, including dynemicin A; bisphosphonates, such as clodronate; an esperamicin; as well as neocarzinostatin chromophore and related chromoprotein enediyne antiobiotic chromophores), aclacinomysins, actinomycin, authramycin, azaserine, bleomycins, cactinomycin, carabicin, caminomycin, carzinophilin, chromomycinis, dactinomycin, daunorubicin, detorubicin, 6-diazo-5-oxo-L-norleucine, ADRIAMYCIN® doxorubicin (including morpholin
  • aminoglutethimide aminoglutethimide, mitotane, trilostane
  • folic acid replenisher such as frolinic acid
  • aceglatone aminoglutethimide, mitotane, trilostane
  • folic acid replenisher such as frolinic acid
  • aceglatone aminoglutethimide, mitotane, trilostane
  • folic acid replenisher such as frolinic acid
  • aceglatone aminoglutethimide, mitotane, trilostane
  • folic acid replenisher such as frolinic acid
  • aceglatone aminoglutethimide, mitotane, trilostane
  • folic acid replenisher such as frolinic acid
  • aceglatone aminoglutethimide, mitotane, trilostane
  • folic acid replenisher such as frolinic acid
  • aceglatone aminoglutethimide, mitotane, trilostane
  • aldophosphamide glycoside aminolevulinic acid
  • eniluracil amsacrine
  • bestrabucil bisantrene
  • edatraxate def of amine; demecolcine; diaziquone; elformithine; elliptinium acetate; an epothilone; etoglucid; gallium nitrate; hydroxyurea; lentinan; lonidainine; maytansinoids such as maytansine and ansamitocins; mitoguazone; mitoxantrone; mopidanmol; nitraerine; pentostatin; phenamet;
  • pirarubicin pirarubicin; losoxantrone; podophyllinic acid; 2-ethylhydrazide; procarbazine; PSK® polysaccharide complex (JHS Natural Products, Eugene, Oreg.); razoxane; rhizoxin; sizofuran; spirogermanium; tenuazonic acid; triaziquone; 2,2',2"-trichlorotriethylamine; trichothecenes (especially T-2 toxin, verracurin A, roridin A and anguidine); urethan; vindesine; dacarbazine; mannomustine; mitobronitol; mitolactol; pipobroman; gacytosine; arabinoside ("Ara-C"); cyclophosphamide; thiotepa; taxoids, e.g.
  • TAXOL® paclitaxel (Bristol-Myers Squibb Oncology, Princeton, N.J.), ABRAXANE® Cremophor- free, albumin-engineered nanoparticle formulation of paclitaxel (American Pharmaceutical Partners, Schaumberg, 111.), and TAXOTERE® doxetaxel (Rhone-Poulenc Rorer, Antony, France);
  • chloranbucil GEMZAR® gemcitabine
  • 6-thioguanine 6-thioguanine
  • mercaptopurine methotrexate
  • platinum analogs such as cisplatin, oxaliplatin and carboplatin
  • vinblastine platinum
  • platinum etoposide (VP-16);
  • ifosfamide mitoxantrone; vincristine; NAVELBINE.RTM. vinorelbine; novantrone; teniposide; edatrexate; daunomycin; aminopterin; xeloda; ibandronate; irinotecan (Camptosar, CPT-11)
  • irinotecan including the treatment regimen of irinotecan with 5-FU and leucovorin); topoisomerase inhibitor RFS 2000; difluoromethylornithine (DMFO); retinoids such as retinoic acid; capecitabine;
  • combretastatin combretastatin
  • leucovorin LV
  • oxaliplatin including the oxaliplatin treatment regimen (FOLFOX); lapatinib (Tykerb.RTM.); inhibitors of PKC-alpha, Raf, H-Ras, EGFR (e.g. , erlotinib (Tarceva®)) and VEGF-A that reduce cell proliferation and pharmaceutically acceptable salts, acids or derivatives of any of the above.
  • the methods of treatment can further include the use of radiation.
  • the terms “treat,” “treatment,” “treating,” or “amelioration” refer to therapeutic treatments, wherein the object is to reverse, alleviate, ameliorate, inhibit, slow down or stop the progression or severity of a condition associated with, a disease or disorder.
  • the term “treating” includes reducing or alleviating at least one adverse effect or symptom of a condition, disease or disorder associated with a chronic immune condition, such as, but not limited to, a chronic infection or a cancer.
  • Treatment is generally “effective” if one or more symptoms or clinical markers are reduced. Alternatively, treatment is “effective” if the progression of a disease is reduced or halted.
  • treatment includes not just the improvement of symptoms or markers, but also a cessation of at least slowing of progress or worsening of symptoms that would be expected in absence of treatment.
  • Beneficial or desired clinical results include, but are not limited to, alleviation of one or more symptom(s), diminishment of extent of disease, stabilized (i.e., not worsening) state of disease, delay or slowing of disease progression, amelioration or palliation of the disease state, and remission (whether partial or total), whether detectable or undetectable.
  • treatment also includes providing relief from the symptoms or side-effects of the disease (including palliative treatment).
  • the methods described herein comprise administering an effective amount of the bispecific or multispecific polypeptide agents described herein to a subject in order to alleviate a symptom of persistent infection.
  • "alleviating a symptom of a persistent infection” is ameliorating any condition or symptom associated with the persistent infection.
  • alleviating a symptom of a persistent infection can involve reducing the infectious microbial (such as viral, bacterial, fungal or parasitic) load in the subject relative to such load in an untreated control. As compared with an equivalent untreated control, such reduction or degree of prevention is at least 5%, 10%, 20%, 40%, 50%, 60%, 80%, 90%, 95%, or 100% as measured by any standard technique.
  • the persistent infection is completely cleared as detected by any standard method known in the art, in which case the persistent infection is considered to have been treated.
  • a patient who is being treated for a persistent infection is one who a medical practitioner has diagnosed as having such a condition.
  • Diagnosis can be by any suitable means. Diagnosis and monitoring can involve, for example, detecting the level of microbial load in a biological sample (for example, a tissue biopsy, blood test, or urine test), detecting the level of a surrogate marker of the microbial infection in a biological sample, detecting symptoms associated with persistent infections, or detecting immune cells involved in the immune response typical of persistent infections (for example, detection of antigen specific T cells that are anergic and/or functionally impaired).
  • the term "effective amount” as used herein refers to the amount of a bispecific or multispecific polypeptide agent having specificity for PD-1 and TIM-3, needed to alleviate at least one or more symptom of the disease or disorder, and relates to a sufficient amount of pharmacological composition to provide the desired effect, i.e. , reverse the functional exhaustion of antigen-specific T cells in a subject having a chronic immune condition, such as cancer or hepatitis C.
  • a chronic immune condition such as cancer or hepatitis C.
  • therapeutically effective amount therefore refers to an amount of a a bispecific or multispecific polypeptide agent using the methods as disclosed herein, that is sufficient to effect a particular effect when administered to a typical subject.
  • An effective amount as used herein would also include an amount sufficient to delay the development of a symptom of the disease, alter the course of a symptom disease (for example but not limited to, slow the progression of a symptom of the disease), or reverse a symptom of the disease. Thus, it is not possible to specify the exact “effective amount”. However, for any given case, an appropriate "effective amount” can be determined by one of ordinary skill in the art using only routine experimentation.
  • Effective amounts, toxicity, and therapeutic efficacy can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., for determining the LD50 (the dose lethal to 50% of the population) and the ED50 (the dose therapeutically effective in 50% of the population).
  • the dosage can vary depending upon the dosage form employed and the route of administration utilized.
  • the dose ratio between toxic and therapeutic effects is the therapeutic index and can be expressed as the ratio LD50/ED50.
  • Compositions and methods that exhibit large therapeutic indices are preferred.
  • a therapeutically effective dose can be estimated initially from cell culture assays.
  • a dose can be formulated in animal models to achieve a circulating plasma concentration range that includes the IC50 (i.e., the concentration of the bispecific or multispecific polypeptide agent ), which achieves a half-maximal inhibition of symptoms) as determined in cell culture, or in an appropriate animal model.
  • IC50 i.e., the concentration of the bispecific or multispecific polypeptide agent
  • Levels in plasma can be measured, for example, by high performance liquid chromatography.
  • the effects of any particular dosage can be monitored by a suitable bioassay. The dosage can be determined by a physician and adjusted, as necessary, to suit observed effects of the treatment.
  • the term “consisting essentially of” refers to those elements required for a given embodiment. The term permits the presence of additional elements that do not materially affect the basic and novel or functional characteristic(s) of that embodiment of the invention.
  • T cell dysfunction or exhaustion in tumor bearing hosts is one such mechanism.
  • PD-1 has been identified as a marker of exhausted T cells in chronic disease states and blockade of PD- 1/PD-lL interactions has been shown to partially restore T cell function.
  • Tim-3 is expressed on CD8+ tumor-infiltrating lymphocytes (TILs) in mice bearing solid tumors. All Tim-3+ TILs co-express PD- 1 and Tim-3+PD-l+ TILs represent the predominant fraction of T cells infiltrating tumors.
  • Tim- 3+PD-1+ TILs exhibit the most severe exhausted phenotype as defined by failure to proliferate, or by failure to produce IL-2, TNFa and IFNy.
  • the inventors further find that combined targeting of the Tim-3 and PD-1 pathways is more effective in controlling tumor growth than targeting either pathway alone.
  • T cell exhaustion describes a state of T cell dysfunction that was initially observed during chronic lymphocytic choriomeningitis virus (LCMV) infection in mice (Zajac et al. 1998). Exhausted T cells fail to proliferate and exert effector functions such as cytotoxicity and cytokine secretion in response to antigen stimulation. Further studies identified that exhausted T cells are characterized by sustained expression of the inhibitory molecule programmed cell death 1 (PD-1) and that blockade of PD-1 and PD-1 ligand (PD-L1) interactions can reverse T cell exhaustion and restore antigen specific T cell responses in LCMV infected mice (Barber et al. 2006).
  • PD-1 programmed cell death 1
  • PD-L1 blockade of PD-1 and PD-1 ligand
  • T cell exhaustion also occurs during chronic infections in humans (reviewed (Klenerman and Hill 2005)) and CD8+T cells in humans chronically infected with HIV (Day et al. 2006; Petrovas et al. 2006) (Trautmann et al. 2006), hepatitis B virus (HBV) (Boettler et al. 2006) and hepatitis C virus (HCV) (Urbani et al. 2006) express high levels of PD-1. Blocking of PD-l/PD-L interactions in these cells can restore T cell function in vitro.
  • PD-1 expression is found on tumor infiltrating CD8+ T cells in multiple solid tumors (Blank et al. 2006; Ahmadzadeh et al. 2009; Gehring et al. 2009) and on antigen specific CD8+ T cells in hosts with non-solid tumors (Yamamoto et al. 2008; Mumprecht et al. 2009).
  • these PD-1+ T cells are dysfunctional.
  • PD-L1 is expressed at high levels in several different cancers (Latchman et al. 2001; Dong et al. 2002; Brown et al.
  • Tim-3 is a molecule originally identified as being selectively expressed on IFN- ⁇ secreting Thl and Tel cells (Monney et al. 2002). Interaction of Tim-3 with its ligand, galectin-9, triggers cell death in Tim-3+ T cells. Thus, both Tim-3 and PD-1 can function as negative regulators of T cell responses. In HIV patients, TIM-3 and PD-1 mark distinct populations of exhausted cells with cells positive for both PD- 1 and TIM-3 comprising the smallest fraction (Jones et al. 2008) of CD8+ T cells.
  • TIM-3 is upregulated on exhausted T cells in patients with HCV (Golden- Mason et al. 2009).
  • cells that co-express TIM-3 and PD-1 are the most abundant fraction among HCV-specific CD8+ T cells.
  • blocking TIM-3 restored T cell proliferation and enhanced cytokine production.
  • Tim-3 and PD-1 are co-expression of Tim-3 and PD-1 on a large fraction of tumor infiltrating lymphocytes (TILs) in mice bearing solid tumors.
  • TILs tumor infiltrating lymphocytes
  • the inventors further show that combined targeting of the Tim-3 and PD-1 pathways is highly effective in controlling tumor growth.
  • Tim-3 As well as PD-1 in T cells from mice bearing the solid tumor CT26 colon was first examined.
  • TILs CD8 + carcinoma tumor infiltrating lymphocytes
  • FIG. 1A and IB the CD8 + TILs in mice bearing other solid tumors were examined: 4T1 mammary adenocarcinoma and B16F10 melanoma.
  • mice that co-express Tim-3 and PD-1 also comprise -50% of the CD8 TILs in mice bearing 4T1 tumor with cells expressing PD-1 alone or neither Tim-3 or PD-1 also comprising smaller populations (-25% and -15%, respectively) (FIGURE IB).
  • mice bearing B 16F10 melanoma all three populations of CD8 + TILs (Tim-3 " PD-r, Tim-3 + PD-l + and Tim-3 + PD-l + ) are roughly present at equal frequency.
  • any Tim-3 + PD-l " TILs were not observed (FIGURE 1A).
  • CD4 + TILs were also examined; however, these are less abundant and among these it was found that the majority were Tim- 3TD-1 " with the Tim3+PD-1 + and Tim-3 " PD-1 + populations being roughly equivalent (FIGURE 1A).
  • Tim-3 and PD-1 co-expressing CD8 + TILs comprise a major population of T cell present in TILs infiltrating different solid tumors.
  • Tim-3 and PD-1 expression was also examined in the spleens of tumor-bearing mice.
  • a trend towards increased frequency of CD8 + Tim-3 + cells compared to naive mice was observed; however, the extent of this increase was variable among mice bearing different solid tumors (FIGURE 1C).
  • the CD8+ TILs little, if any, evidence was found for co- expression of PD-1 with Tim-3 among splenic CD8T cells in tumor-bearing mice (FIGURE 6), suggesting that upregulation of PD-1 on CD8 Tim-3 + cells can happen specifically in the tumor environment in response to environmental cues.
  • two distinct populations of Tim-3 + cells, Tim-3 hlgh and Tim-3 low in the peripheral lymphoid tissue of tumor bearing mice were
  • Tim -3 low population was characterized by co- expression of PD-1 , suggesting that these cells could be the precursors of Tim-3 + PD-l + TILs and that they could represent T cells that are in a different functional state from Tim-3 hlgh cells (FIGURE 6).
  • Tim-3-PD-l-, Tim-3-PD-l+ and Tim-3+PD-l+ TILs All three populations of TILs expressed high levels of CD44 (FIGURES 2 A and 2B).
  • Tim-3 -PD-1- and Tim-3-PD-l+ TILs contained naive (CD44 low CD62L hi ) T cells, with the Tim-3 " PD-1 " TILs containing the highest proportion of naive T cells (-35%).
  • Tim-3 + PD-l + TILs the majority were CD62L low and the fraction of central memory (CD44 hi CD62L hi ) cells was lowest in this population.
  • PD-1 has been identified as a marker of dysfunctional or exhausted CD8 + T cells (Barber et al. 2006). Furthermore, it has been observed that there is a hierarchy of T cell exhaustion with CTL function and production of IL-2 being compromised first, followed by loss of TNFand then IFN(Wherry et al. 2003). Therefore, to determine whether any of the Tim-3 and PD-1 expressing TILs exhibited exhausted phenotype, CD8+ TILs were isolated and their production of IL -2, TNFa, and IFNy was examined directly ex vivo.
  • Tim-3+PD- 1+ TILs exhibited the most profound impairment in production of IL-2, TNFa, and IFNy when compared to Tim-3-PD-l+ TILs and Tim -3 -PD-1- TILs (FIGURE 3A).
  • the Tim-3-PD- 1+ TILs produced the most IFNy among the three populations of TILs and showed significantly less impairment in the production of IL-2 and TNFa than the Tim-3+PD-l+ TILs.
  • Tim-3 +PD-T + cells and Tim-3-PD-l+ cells were determined within the cytokine producing and non -producing TILs (FIGURE 3B). It was found that Tim-3+PD-l+ cells are the most abundant (55-60%) population among cytokine non-producing TILs, outnumbering Tim-3-PD-l+ cells by 3-4 fold. Examination of cytokine-producing TILs revealed that Tim-3+PD-l+ cells are less abundant than Tim-3-PD-l+ among IL-2 -producing TILs. A similar trend was observed with TNFa, although this did not reach statistical significance. Both populations were equally represented among IFNy producing TILs.
  • Tim-3+PD-l+ cells are the most abundant population that is stuck in GO, outnumbering Tim-3-PD-l+ cells by 5 to 1 (FIGURE 4B).
  • Tim- 3+PD-1+ cells steadily decrease in number while Tim-3-PD-l+ cells steadily increase with progression through cell cycle.
  • PD-1 or Tim-3 (Jones et al. 2008; Golden-Mason et al. 2009) signaling pathways can improve T cell function in the context of chronic infections raised the possibility that combined targeting of these two pathways can prove to be the most efficacious means to restore anti-tumor immunity in vivo.
  • the expression of the PD-1 and Tim-3 ligands (PD-L1 and galectin-9, respectively) on CT26 tumor (FIGURE 7) was first confirmed.
  • CT26 tumor-bearing mice were then treated with an anti-Tim-3 antibody that was previously described to have blocking function in vivo (Monney et al.
  • anti-PD-Ll antibody anti-Tim-3 plus anti-PD-Ll antibodies, or control immunoglobulins. It was found that treatment with anti-Tim-3 alone had little or no effect and treatment with anti-PD-Ll alone showed a trend towards delayed tumor growth; however, this varied between experiments and did not reach statistical significance (FIGURE 5). However, combined treatment with anti -Tim-3 and anti-PD-Ll resulted in a dramatic reduction in tumor growth with 50% of the mice exhibiting complete tumor regression. Since CT26 tumor expresses PD-L1 but not Tim-3 (FIGURE 7), the possibility that anti-PD-Ll antibody could have direct inhibitory effects on tumor growth was controlled for.
  • CT26 tumor was cultured in the presence of anti-PD-Ll or control immunoglobulin and it was found that tumor proliferation was not affected (FIGURE 8).
  • the effect of anti-Tim-3 plus anti-PD-Ll treatment in mice bearing B 16 melanoma was also tested, and it was found that mice receiving the combined treatment exhibit enhanced survival relative to control immunoglobulin, anti-Tim-3, or anti-PD-Ll -treated mice.
  • TILs from mice bearing CT26 tumor were isolated and cultured in the presence of anti-Tim-3, anti-PD-Ll, anti-Tim-3 plus anti-PD-Ll antibodies, or control
  • FIGURE 11 demonstrates that combined targeting of Tim-3 and PD-1 pathways dramatically increases survival in a B 16 melanoma model.
  • FIGURE 12 demonstrates restoration of tumor specific T cell response in mice treated with anti-Tim-3 and anti-PD-Ll.
  • Cells from the draining lymph node of Balb/c mice implanted with CT-26 colon carcinoma were treated with either control immunoglobulin, anti-Tim-3 antibody (clone 2C12), anti-PD-Ll antibody (clone 10F.9G2), or both antibodies.
  • Cells from the tumor draining lymph node of treated mice were cultured with the tumor antigen AH1 (30 ⁇ g/ml). Production of IFN- ⁇ ⁇ supernatant collected at 48 hrs is shown. *p>0.01, **p>0.05, One-way ANOVA, Tukey's multiple comparison test. Data shown are the mean of two independent samples. Similar results were obtained in two additional independent experiments. Again, combined treatment dramatically increases the IFN- ⁇ I secretion relative to secretion with either agent alone.
  • FIGURE 13 demonstrates effects of targeting the Tim-3 and PD-1 pathways on established tumors.
  • Tim-3 and PD-1 signaling pathways is highly effective in restoring anti-tumor immunity.
  • PD-1 has been the primary marker for exhausted T cells.
  • the data described herein show that PD-1 single positive TILs likely include bonafide effector T cells that produce IFNy, as this population contains the highest frequency of IFNy producing cells, even higher than the PD -l im-3 " TILs (FIGURE 3A).
  • Tim- 3 can transmit a death signal into T cells. How then do Tim-3+PD-l+ exhausted T cells persist in chronic conditions? Without wishing to be bound or limited by a theory, one possibility is that differential levels of Tim-3 expression drive different functional outcomes, i.e. , high levels of Tim-3 promote T cell death whereas low levels of Tim-3 transmit an inhibitory signal that allows for cells to escape death and persist in a dysfunctional state. In this regard, the presence of Tim -3 low cells in both the CD4 and CD8 compartments in the periphery of tumor-bearing mice was observed (FIGURE 6). It will be interesting to determine if these T cells are in a different state of effector function compared to ⁇ -3 ⁇ 1 cells.
  • a second, non-mutually exclusive possibility is that co expression of PD-1 and/or other inhibitory molecules, such as LAG-3, is responsible or preserving cells with exhausted phenotype.
  • a third non-mutually exclusive possibility is that the decision between exhaustion and death could be regulated at the level of availability of Tim-3 ligand, galectin-9. In this regard, it still remains to be demonstrated whether development of exhaustion in TILs is dependent on galectin-9 expression on the tumor itself or whether it starts in the periphery and the exhausted phenotype is further amplified by an interaction of Tim-3 :Galectin-9 in the tumor.
  • Tim-3+PD-l+ cells were identified as the truly exhausted T cells in chronic conditions facilitates the examination of the gene programs that drive/maintain exhausted phenotype, and provides therapeutic approchaes for stimulating immune activity in chronic immune conditions, such as cancer and infectious diseases.
  • Tumor infiltrating Lymphocytes were isolated by dissociating tumor tissue in the presence of collagenase D (25 mg/ml) for 20 min prior to centrifugation on a discontinuous Percoll gradient (GE Healthcare). Isolated cells were then used in various assays of T cell function.
  • Ki67 and TO-PR 0-3 staining were harvested and cultured in vitro in the presence of anti-CD3 ( ⁇ g/ml) for 48 hrs. Cells were then stained with antibodies against CD8, PD-1, Tim-3 (8B.2C12) prior to permeabilization and staining with antibody against Ki-67 (Biolegend) and with TO-PRO-3 iodide (Invitrogen). All data were collected on a BD LsrII (BD Biosciences) and analyzed with FlowJo software (Tree Star).
  • mice were treated with either 100 ⁇ g of anti -Tim-3 (clone 8B.2C12) ip on days 0, 2 and 4 or 200 ⁇ g of anti-PD-Ll (clone 10F.9G2) on days 0, 3, 6, 9 and 12, or isotype control
  • Tumor surface was measured in two dimensions using a caliper.
  • Tumor infiltrating lymphocytes were harvested as described and cultured (l-3xl0 5 /well) in the presence of soluble anti-CD3 (5 ⁇ g/ml) and 10 ⁇ g/ml of either anti- Tim-3 (clone 8B.2C12), anti-PD-Ll (clone 10F.9G2), both anti-Tim-3 plus anti-PD-Ll or control immunoglobulins (Rat IgGl and RatIgG2b). After 96 hours, culture supernatant was collected and IFNy measured by cytometric bead array (CBA) (BD Biosciences).
  • CBA cytometric bead array
  • Blockade of PD-L1 augments human tumor-specific T cell responses in vitro. Int. J. Cancer. 119: 317-27. Boettler, T., E. Panther, B. Bengsch, N. Nazarova, H. C. Spangenberg, H. E. Blum and R. Thimme. 2006.
  • interleukin -7 receptor alpha chain (CD 127) on virus-specific CD8+ T cells identifies functionally and phenotypically defined memory T cells during acute resolving hepatitis B virus infection. J. Virol. 80: 3532-40.
  • CD4+Ki67+ lymphocytes in HIV-infected patients are effector T cells accumulated in the G 1 phase of the cell cycle.EurJImmunol. 30: 3598-603.
  • Tumor-associated B7-H1 promotes T-cell apoptosis: a potential mechanism of immune evasion. Nat Med. 8: 793-800.
  • PD-1 is a regulator of NY -ESO-1- specific CD8+ T cell expansion in melanoma patients. J Immunol. 182: 5240-9.
  • Tim- 3 expression defines a novel population of dysfunctional T cells with highly elevated frequencies in progressive HIV -1 infection. J. Exp. Med. 205: 2763-79. Klenerman, P. and A. Hill. 2005. T cells and viral persistence: lessons from diverse infections. Nat Immunol. 6: 873-9.
  • PD-L2 is a second ligand for PD-1 and inhibits T cell activation. Nat Immunol. 2: 261-8.
  • PD-1 is a regulator of virus-specific CD8+ T cell survival in HIV infection. J. Exp. Med. 203: 2281-92.
  • Tumor B7-H1 is associated with poor prognosis in renal cell carcinoma patients with long-term follow-up. Cancer Res. 66: 3381- 5.
  • HCV acute hepatitis C virus

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US20160002334A1 (en) 2016-01-07
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US20250223357A1 (en) 2025-07-10
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CA2802344C (en) 2023-06-13

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