US20060194290A1 - Polypeptide variants with altered effector function - Google Patents

Polypeptide variants with altered effector function Download PDF

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US20060194290A1
US20060194290A1 US11/429,792 US42979206A US2006194290A1 US 20060194290 A1 US20060194290 A1 US 20060194290A1 US 42979206 A US42979206 A US 42979206A US 2006194290 A1 US2006194290 A1 US 2006194290A1
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region
binding
polypeptide
amino acid
antibody
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Leonard Presta
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Genentech Inc
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2896—Immunoglobulins [IGs], 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
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P11/00—Drugs for disorders of the respiratory system
    • A61P11/06—Antiasthmatics
    • 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
    • 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
    • A61P37/00—Drugs for immunological or allergic disorders
    • A61P37/08—Antiallergic agents
    • 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 [IGs], e.g. monoclonal or polyclonal antibodies
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/22—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against growth factors ; against growth regulators
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/42—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against immunoglobulins
    • C07K16/4283—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against immunoglobulins against an allotypic or isotypic determinant on Ig
    • C07K16/4291—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against immunoglobulins against an allotypic or isotypic determinant on Ig against IgE
    • 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
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
    • C07K2317/24—Immunoglobulins specific features characterized by taxonomic origin containing regions, domains or residues from different species, e.g. chimeric, humanized or veneered
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
    • C07K2317/565—Complementarity determining region [CDR]
    • 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
    • C07K2317/732—Antibody-dependent cellular cytotoxicity [ADCC]
    • 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
    • C07K2317/734—Complement-dependent cytotoxicity [CDC]
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2319/00—Fusion polypeptide
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2319/00—Fusion polypeptide
    • C07K2319/30—Non-immunoglobulin-derived peptide or protein having an immunoglobulin constant or Fc region, or a fragment thereof, attached thereto
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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    • C12N2799/00—Uses of viruses
    • C12N2799/02—Uses of viruses as vector
    • C12N2799/021—Uses of viruses as vector for the expression of a heterologous nucleic acid
    • C12N2799/022—Uses of viruses as vector for the expression of a heterologous nucleic acid where the vector is derived from an adenovirus

Definitions

  • Antibodies are proteins which exhibit binding specificity to a specific antigen.
  • Native antibodies are usually heterotetrameric glycoproteins of about 150,000 daltons, composed of two identical light (L) chains and two identical heavy (H) chains. Each light chain is linked to a heavy chain by one covalent disulfide bond, while the number of disulfide linkages varies between the heavy chains of different immunoglobulin isotypes. Each heavy and light chain also has regularly spaced intrachain disulfide bridges. Each heavy chain has at one end a variable domain (V H ) followed by a number of constant domains.
  • V H variable domain
  • the constant domains are not involved directly in binding an antibody to an antigen, but exhibit various effector functions.
  • antibodies or immunoglobulins can be assigned to different classes.
  • the heavy chain constant regions that correspond to the different classes of immunoglobulins are called ⁇ , ⁇ , ⁇ , ⁇ , and ⁇ , respectively.
  • human immunoglobulin classes only human IgG1, IgG2, IgG3 and IgM are known to activate complement; and human IgG1 and IgG3 mediate ADCC more effectively than IgG2 and IgG4.
  • an antibody While binding of an antibody to the requisite antigen has a neutralizing effect that might prevent the binding of a foreign antigen to its endogenous target (e.g. receptor or ligand), binding alone may not remove the foreign antigen.
  • an antibody To be efficient in removing and/or destructing foreign antigens, an antibody should be endowed with both high affinity binding to its antigen, and efficient effector functions.
  • ADCC antibody-dependent cell-mediated cytotoxicity
  • CDC complement dependent cytotoxicity
  • Fc ⁇ RIIIB is found only on neutrophils
  • Fc ⁇ RIIIA is found on macrophages, monocytes, natural killer (NK) cells, and a subpopulation of T-cells.
  • Fc ⁇ RIIIA is the only FcR present on NK cells, one of the cell types implicated in ADCC.
  • Fc ⁇ RI, Fc ⁇ RII and Fc ⁇ RIII are immunoglobulin superfamily (IgSF) receptors; Fc ⁇ RI has three IgSF domains in its extracellular domain, while Fc ⁇ RII and Fc ⁇ RIII have only two IgSF domains in their extracellular domains.
  • IgSF immunoglobulin superfamily
  • FcRn neonatal Fc receptor
  • MHC major histocompatibility complex
  • G316-K338 human IgG for human Fc ⁇ RI (by sequence comparison only; no substitution mutants were evaluated) (Woof et al. Molec. Immunol. 23:319-330 (1986)); K274-R301 (human IgG1) for human Fc ⁇ RIII (based on peptides) (Sarmay et al. Molec. Immunol. 21:43-51 (1984)); Y407-R416 (human IgG) for human Fc ⁇ RIII (based on peptides) (Gergely et al. Biochem. Soc. Trans.
  • Pro331 in IgG3 was changed to Ser, and the affinity of this variant to target cells analyzed.
  • the affinity was found to be six-fold lower than that of unmutated IgG3, indicating the involvement of Pro331 in Fc ⁇ RI binding.
  • the residue Pro331 has been implicated in C1q binding by analysis of the ability of human IgG subclasses to carry out complement mediated cell lysis. Mutation of Ser331 to Pro331 in IgG4 conferred the ability to activate complement. (Tao et al., J. Exp. Med., 178:661-667 (1993); Brekke et al., Eur. J. Immunol., 24:2542-47 (1994)).
  • the polypeptide variant may display reduced binding to an Fc ⁇ RI and comprise an amino acid modification at any one or more of amino acid positions 238, 265, 269, 270, 327 or 329 of the Fc region, wherein the numbering of the residues in the Fc region is that of the EU index as in Kabat.
  • the polypeptide variant may display reduced binding to an Fc ⁇ RII and comprise an amino acid modification at any one or more of amino acid positions 238, 265, 269, 270, 292, 294, 295, 298, 303, 324, 327, 329, 333, 335, 338, 373, 376, 414, 416, 419, 435, 438 or 439 of the Fc region, wherein the numbering of the residues in the Fc region is that of the EU index as in Kabat.
  • the polypeptide variant of interest may display reduced binding to an Fc ⁇ RIII and comprise an amino acid modification at one or more of amino acid positions 238, 239, 248, 249, 252, 254, 265, 268, 269, 270, 272, 278, 289, 293, 294, 295, 296, 301, 303, 322, 327, 329, 338, 340, 373, 376, 382, 388, 389, 416, 434, 435 or 437 of the Fc region, wherein the numbering of the residues in the Fc region is that of the EU index as in Kabat.
  • the invention further provides a polypeptide comprising a variant Fc region with altered neonatal Fc receptor (FcRn) binding affinity, which polypeptide comprises an amino acid modification at any one or more of amino acid positions 238, 252, 253, 254, 255, 256, 265, 272, 286, 288, 303, 305, 307, 309, 311, 312, 317, 340, 356, 360, 362, 376, 378, 380, 382, 386, 388, 400, 413, 415, 424, 433, 434, 435, 436, 439 or 447 of the Fc region, wherein the numbering of the residues in the Fc region is that of the EU index as in Kabat.
  • FcRn neonatal Fc receptor
  • polypeptide variants may, alternatively, display increased binding to FcRn and comprise an amino acid modification at any one or more of amino acid positions 238, 256, 265, 272, 286, 303, 305, 307, 311, 312, 317, 340, 356, 360, 362, 376, 378, 380, 382, 413, 424 or 434 of the Fc region, wherein the numbering of the residues in the Fc region is that of the EU index as in Kabat.
  • the invention also provides a composition comprising the polypeptide variant and a physiologically or pharmaceutically acceptable carrier or diluent.
  • This composition for potential therapeutic use is sterile and may be lyophilized.
  • the invention provides a method for determining the presence of an antigen of interest comprising exposing a sample suspected of containing the antigen to the polypeptide variant and determining binding of the polypeptide variant to the sample.
  • the invention provides a method of treating a mammal suffering from or predisposed to a disease or disorder, comprising administering to the mammal a therapeutically effective amount of a polypeptide variant as disclosed herein, or of a composition comprising the polypeptide variant and a pharmaceutically acceptable carrier.
  • Step (b) of the method may comprise determining binding of the variant Fc region to one or more FcRs in vitro. Moreover, the method may result in the identification of a variant Fc region with improved FcR binding affinity, or with improved ADCC activity, in step (b) thereof.
  • the FcR may, for example, be human Fc gamma receptor III (Fc ⁇ RIII).
  • step (b) comprises determining binding of the variant Fc region to at least two different FcRs
  • the FcRs tested preferably include human Fc gamma receptor II (Fc ⁇ RII) and human Fc gamma receptor III (Fc ⁇ RIII).
  • FIG. 2 shows C1q binding of wild type (wt) C2B8 antibody; C2B8 antibody with a human IgG2 constant region (IgG2); and variants K322A, K320A and E318A.
  • FIG. 5 is a schematic diagram of the “immune complex” prepared for use in the FcR assay described in Example 1.
  • the hexamer comprising three anti-IgE antibody molecules (the “Fc region-containing polypeptide”) and three IgE molecules (the “first target molecule”) is shown.
  • IgE has two “binding sites” for the anti-IgE antibody (E27) in the Fc region thereof.
  • Each IgE molecule in the complex is further able to bind two VEGF molecules (“the second target polypeptide”).
  • VEGF has two “binding sites” for IgE.
  • FIG. 7 depicts complement dependent cytotoxicity (CDC) of variants D270K and D270V, compared to wild type C2B8.
  • FIG. 10 depicts the three-dimensional structure of a human lgG Fc region, highlighting residues: Asp270, Lys326, Pro329, Pro331, Lys322 and Glu333.
  • FIGS. 15A and 15B show binding patterns for parent antibody (E27) to Fc ⁇ RIIB and Fc ⁇ RIIIA.
  • FIG. 15A shows the binding pattern for the humanized anti-IgE E27 IgG1 as a monomer (open circles), hexamer (closed squares), and immune complex consisting of multiple hexamers (closed triangles) to a recombinant GST fusion protein of the human Fc ⁇ RIIB (CD32) receptor a subunit.
  • the hexameric complex (closed squares) was formed by the mixture of equal molar concentrations of E27 (which binds to the Fc region of human IgE) and a human myeloma IgE.
  • the hexamer is a stable 1.1 kD complex consisting of 3 IgG molecules (150 kD each) and 3 IgE molecules (200 kD each).
  • the immune complex (closed triangles) was formed sequentially by first mixing equal molar concentrations of E27 and recombinant anti-VEGF IgE (human IgE with Fab variable domains that bind human VEGF) to form the hexamer. Hexamers were then linked to form an immune complex by the addition of 2 ⁇ molar concentration of human VEGF, a 44 kD homodimer which has two binding sites for the anti-VEGF IgE per mole of VEGF.
  • FIG. 15B shows the binding pattern to a recombinant GST fusion protein of the human Fc ⁇ RIIIA (CD16) receptor a subunit.
  • FIG. 16A shows the binding of immune complexes using different antigen-antibody pairs to recombinant GST fusion protein of the Fc ⁇ RIIA receptor a subunit.
  • FIG. 16B shows the binding of the same antigen-antibody pairs to the GST fusion protein of the Fc ⁇ RIIIA receptor a subunit. Closed circles represent binding of human IgE:anti-IgE E27 IgG1; open circles represent binding of human VEGF:humanized anti-VEGF IgG1.
  • FIG. 17 summarizes differences in binding selectivity of some alanine variants between the different Fc ⁇ Rs. Binding of alanine variants at residues in the CH2 domain of anti-IgE E27 IgG1 are shown to Fc ⁇ RIIA, Fc ⁇ RIIB, and Fc ⁇ RIIIA. Type 1 abrogates binding to all three receptors: D278A (265 in EU numbering). Type 2 improves binding to Fc ⁇ RIIA and Fc ⁇ RIIB, while binding to Fc ⁇ RIIIA is unaffected: S280A (267 in EU numbering). Type 3 improves binding to Fc ⁇ RIIA and Fc ⁇ RIIB, but reduces binding to Fc ⁇ RIIIA: H281A (268 in EU numbering).
  • Type 4 reduces binding to Fc ⁇ RIIA and Fc ⁇ RIIB, while improving binding to Fc ⁇ RIIIA: S317A (298 in EU numbering).
  • Type 5 improves binding to Fc ⁇ RIIIA, but does not affect binding to Fc ⁇ RIIA and Fc ⁇ RIIB: E352A, K353A (333 and 334 in EU numbering).
  • FIGS. 18A and 18B compare the Fc ⁇ RIIIA protein/protein assay and CHO GPI-Fc ⁇ RIIIA cell based assay, respectively.
  • FIG. 18A illustrates binding of selected alanine variants to Fc ⁇ RIIIA-GST fusion protein. S317A (298 in EU numbering) and S317A/K353A (298 and 334 in EU numbering) bind better than E27 wildtype, while D278A (265 in EU numbering) almost completely abrogates binding.
  • FIG. 18B illustrates that a similar pattern of binding is found on CHO cells expressing a recombinant GPI-linked form of Fc ⁇ RIIIA.
  • FIGS. 19A and 19B compare the Fc ⁇ RIIB protein/protein assay and CHO GPI-Fc ⁇ RIIB cell based assay, respectively.
  • FIG. 19A illustrates binding of selected alanine variants to Fc ⁇ RIIB-GST fusion protein. H281A (268 in EU numbering) binds better than E27 wildtype while S317A (298 in EU numbering) shows reduced binding.
  • FIG. 19B illustrates that a similar pattern of binding is found on CHO cells expressing a recombinant membrane bound form of Fc ⁇ RIIB.
  • FIG. 20 shows single alanine substitutions in the CH2 domain of anti-HER2 IgG1 (HERCEPTIN®) that influence Fc ⁇ RIIIA binding in both the protein-protein and cell-based assays alter the ability to bind to Fc ⁇ RIIIA on peripheral blood mononuclear cell (PBMC) effector cells.
  • PBMC peripheral blood mononuclear cell
  • a single alanine mutation that only slightly increased binding to Fc ⁇ RIIIA, variant G30 K307A (290 in EU numbering), also showed slightly improved ADCC (i.e., a 1.1 fold improvement in ADCC activity, calculated as area under the curve) at 1.25 ng/ml at all E:T ratios (filled diamonds) compared to wildtype antibody at 1.25 ng/ml (filled square).
  • a single alanine mutation that decreased binding to Fc ⁇ RIIIA, variant G34 Q312A (295 in EU numbering), also showed decreased ADCC activity (filled inverted triangles).
  • G36 displayed a 1.7 fold improvement in ADCC activity, calculated as area under the curve.
  • the effector cells were PBMCs.
  • FIG. 22A depicts alignments of native sequence IgG Fc regions.
  • Native sequence human IgG Fc region sequences humIgG1 (non-A and A allotypes) (SEQ ID NOs: 3 and 4, respectively), humIgG2 (SEQ ID NO:5), humIgG3 (SEQ ID NO:6) and humIgG4 (SEQ ID NO:7), are shown.
  • the human IgG1 sequence is the non-A allotype, and differences between this sequence and the A allotype (at positions 356 and 358; EU numbering system) are shown below the human IgG1 sequence.
  • FIG. 22B shows percent identity among the Fc region sequences of FIG. 22A .
  • FIG. 23 depicts alignments of native sequence human IgG Fc region sequences, humIgG1 (non-A and A allotypes; SEQ ID NOs:3 and 4, respectively), humIgG2 (SEQ ID NO:5), humIgG3 (SEQ ID NO:6) and humIgG4 (SEQ ID NO:7) with differences between the sequences marked with asterisks.
  • FIG. 24 shows area under curve (AUC) for selected variants compared to anti-HER2 IgG1 (HERCEPTIN®) in a 4 hour ADCC assay.
  • Variant G36 (S317A; 298 in Eu numbering) with improved binding to Fc ⁇ RIIIA showed improved ADCC activity; variant G31 (R309A; 292 in Eu numbering) which did not display altered Fc ⁇ RIIIA binding, also had unaltered ADCC activity; and G14 (D265A; 278 in Eu numbering) which had reduced Fc ⁇ RIIIA binding, also had reduced ADCC activity.
  • the numbering of the residues in an immunoglobulin heavy chain is that of the EU index as in Kabat et al., Sequences of Proteins of Immunological Interest, 5th Ed. Public Health Service, National Institutes of Health, Bethesda, Md. (1991), expressly incorporated herein by reference.
  • the “EU index as in Kabar” refers to the residue numbering of the human IgG1 EU antibody.
  • a “parent polypeptide” is a polypeptide comprising an amino acid sequence which lacks one or more of the Fc region modifications disclosed herein and which differs in effector function compared to a polypeptide variant as herein disclosed.
  • the parent polypeptide may comprise a native sequence Fc region or an Fc region with pre-existing amino acid sequence modifications (such as additions, deletions and/or substitutions).
  • the term “Fc region” is used to define a C-terminal region of an immunoglobulin heavy chain, e.g., as shown in FIG. 1 .
  • the “Fc region” may be a native sequence Fc region or a variant Fc region.
  • the human IgG heavy chain Fc region is usually defined to stretch from an amino acid residue at position Cys226, or from Pro230, to the carboxyl-terminus thereof.
  • the Fc region of an immunoglobulin generally comprises two constant domains, CH2 and CH3, as shown, for example, in FIG. 1 .
  • the “CH2 domain” of a human IgG Fc region usually extends from about amino acid 231 to about amino acid 340.
  • the CH2 domain is unique in that it is not closely paired with another domain. Rather, two N-linked branched carbohydrate chains are interposed between the two CH2 domains of an intact native IgG molecule. It has been speculated that the carbohydrate may provide a substitute for the domain-domain pairing and help stabilize the CH2 domain.
  • the “CH3 domain” comprises the stretch of residues C-terminal to a CH2 domain in an Fc region (i.e. from about amino acid residue 341 to about amino acid residue 447 of an IgG)
  • a “functional Fc region” possesses an “effector function” of a native sequence Fc region.
  • exemplary “effector functions” include C1q binding; complement dependent cytotoxicity; Fc receptor binding; antibody-dependent cell-mediated cytotoxicity (ADCC); phagocytosis; down regulation of cell surface receptors (e.g. B cell receptor; BCR), etc.
  • Such effector functions generally require the Fc region to be combined with a binding domain (e.g. an antibody variable domain) and can be assessed using various assays as herein disclosed, for example.
  • a “native sequence Fc region” comprises an amino acid sequence identical to the amino acid sequence of an Fc region found in nature.
  • Native sequence human Fc regions are shown in FIG. 23 and include a native sequence human IgG1 Fc region (non-A and A allotypes); native sequence human IgG2 Fc region; native sequence human IgG3 Fc region; and native sequence human IgG4 Fc region as well as naturally occurring variants thereof.
  • Native sequence murine Fc regions are shown in FIG. 22A .
  • a “variant Fc region” comprises an amino acid sequence which differs from that of a native sequence Fc region by virtue of at least one “amino acid modification” as herein defined.
  • the variant Fc region has at least one amino acid substitution compared to a native sequence Fc region or to the Fc region of a parent polypeptide, e.g. from about one to about ten amino acid substitutions, and preferably from about one to about five amino acid substitutions in a native sequence Fc region or in the Fc region of the parent polypeptide.
  • the variant Fc region herein will preferably possess at least about 80% homology with a native sequence Fc region and/or with an Fc region of a parent polypeptide, and most preferably at least about 90% homology therewith, more preferably at least about 95% homology therewith.
  • “Homology” is defined as the percentage of residues in the amino acid sequence variant that are identical after aligning the sequences and introducing gaps, if necessary, to achieve the maximum percent homology. Methods and computer programs for the alignment are well known in the art. One such computer program is “Align 2”, authored by Genentech, Inc., which was filed with user documentation in the United States Copyright Office, Washington, D.C. 20559, on Dec. 10, 1991.
  • Fc region-containing polypeptide refers to a polypeptide, such as an antibody or immunoadhesin (see definitions below), which comprises an Fc region.
  • Fc receptor or “FcR” are used to describe a receptor that binds to the Fc region of an antibody.
  • the preferred FcR is a native sequence human FcR.
  • a preferred FcR is one which binds an IgG antibody (a gamma receptor) and includes receptors of the Fc ⁇ RI, Fc ⁇ RII, and Fc ⁇ RIII subclasses, including allelic variants and alternatively spliced forms of these receptors.
  • Fc ⁇ RII receptors include Fc ⁇ RIIA (an “activating receptor”) and Fc ⁇ RIIB (an “inhibiting receptor”), which have similar amino acid sequences that differ primarily in the cytoplasmic domains thereof.
  • Activating receptor Fc ⁇ RIIA contains an immunoreceptor tyrosine-based activation motif (ITAM) in its cytoplasmic domain.
  • Inhibiting receptor Fc ⁇ RIIB contains an immunoreceptor tyrosine-based inhibition motif (ITIM) in its cytoplasmic domain.
  • ITAM immunoreceptor tyrosine-based activation motif
  • ITIM immunoreceptor tyrosine-based inhibition motif
  • FcR FcR
  • FcRn neonatal receptor
  • Antibody-dependent cell-mediated cytotoxicity and “ADCC” refer to a cell-mediated reaction in which nonspecific cytotoxic cells that express FcRs (e.g. Natural Killer (NK) cells, neutrophils, and macrophages) recognize bound antibody on a target cell and subsequently cause lysis of the target cell.
  • FcRs e.g. Natural Killer (NK) cells, neutrophils, and macrophages
  • the primary cells for mediating ADCC NK cells, express Fc ⁇ RIII only, whereas monocytes express Fc ⁇ RI, Fc ⁇ RII and Fc ⁇ RIII.
  • FcR expression on hematopoietic cells is summarized in Table 3 on page 464 of Ravetch and Kinet, Annu. Rev. Immunol 9:457-92 (1991).
  • Human effector cells are leukocytes which express one or more FcRs and perform effector functions. Preferably, the cells express at least Fc ⁇ RIII and perform ADCC effector function. Examples of human leukocytes which mediate ADCC include peripheral blood mononuclear cells (PBMC), natural killer (NK) cells, monocytes, cytotoxic T cells and neutrophils; with PBMCs and NK cells being preferred.
  • PBMC peripheral blood mononuclear cells
  • NK natural killer cells
  • monocytes cytotoxic T cells and neutrophils
  • the effector cells may be isolated from a native source thereof, e.g. from blood or PBMCs as described herein.
  • a polypeptide variant with “altered” FcR binding affinity or ADCC activity is one which has either enhanced or diminished FcR binding activity and/or ADCC activity compared to a parent polypeptide or to a polypeptide comprising a native sequence Fc region.
  • the polypeptide variant which “displays increased binding” to an FcR binds at least one FcR with better affinity than the parent polypeptide.
  • the polypeptide variant which “displays decreased binding” to an FcR binds at least one FcR with worse affinity than a parent polypeptide.
  • Such variants which display decreased binding to an FcR may possess little or no appreciable binding to an FcR, e.g., 0-20% binding to the FcR compared to a native sequence IgG Fc region, e.g. as determined in the Examples herein.
  • the polypeptide variant which binds an FcR with “better affinity” than a parent polypeptide is one which binds any one or more of the above identified FcRs with substantially better binding affinity than the parent antibody, when the amounts of polypeptide variant and parent polypeptide in the binding assay are essentially the same.
  • the polypeptide variant with improved FcR binding affinity may display from about 1.15 fold to about 100 fold, e.g. from about 1.2 fold to about 50 fold improvement in FcR binding affinity compared to the parent polypeptide, where FcR binding affinity is determined, for example, as disclosed in the Examples herein.
  • the polypeptide variant which “mediates antibody-dependent cell-mediated cytotoxicity (ADCC) in the presence of human effector cells more effectively” than a parent antibody is one which in vitro or in vivo is substantially more effective at mediating ADCC, when the amounts of polypeptide variant and parent antibody used in the assay are essentially the same.
  • ADCC antibody-dependent cell-mediated cytotoxicity
  • Such variants will be identified using the in vitro ADCC assay as herein disclosed, but other assays or methods for determining ADCC activity, e.g. in an animal model etc, are contemplated.
  • the preferred variant is from about 1.5 fold to about 100 fold, e.g. from about two fold to about fifty fold, more effective at mediating ADCC than the parent, e.g. in the in vitro assay disclosed herein.
  • amino acid modification refers to a change in the amino acid sequence of a predetermined amino acid sequence.
  • exemplary modifications include an amino acid substitution, insertion and/or deletion.
  • the preferred amino acid modification herein is a substitution.
  • amino acid modification at a specified position, e.g. of the Fc region, refers to the substitution or deletion of the specified residue, or the insertion of at least one amino acid residue adjacent the specified residue.
  • insertion “adjacent” a specified residue is meant insertion within one to two residues thereof. The insertion may be N-terminal or C-terminal to the specified residue.
  • amino acid substitution refers to the replacement of at least one existing amino acid residue in a predetermined amino acid sequence with another different “replacement” amino acid residue.
  • the replacement residue or residues may be “naturally occurring amino acid residues” (i.e. encoded by the genetic code) and selected from the group consisting of: alanine (Ala); arginine (Arg); asparagine (Asn); aspartic acid (Asp); cysteine (Cys); glutamine (Gln); glutamic acid (Glu); glycine (Gly); histidine (His); isoleucine (lie): leucine (Leu); lysine (Lys); methionine (Met); phenylalanine (Phe); proline (Pro); serine (Ser); threonine (Thr); tryptophan (Trp); tyrosine (Tyr); and valine (Val).
  • the replacement residue is not cysteine.
  • substitution with one or more non-naturally occurring amino acid residues is also encompassed by the definition of an amino acid substitution herein.
  • a “non-naturally occurring amino acid residue” refers to a residue, other than those naturally occurring amino acid residues listed above, which is able to covalently bind adjacent amino acid residues(s) in a polypeptide chain. Examples of non-naturally occurring amino acid residues include norleucine, ornithine, norvaline, homoserine and other amino acid residue analogues such as those described in Ellman et al. Meth. Enzym. 202:301-336 (1991). To generate such non-naturally occurring amino acid residues, the procedures of Noren et al.
  • amino acid insertion refers to the incorporation of at least one amino acid into a predetermined amino acid sequence. While the insertion will usually consist of the insertion of one or two amino acid residues, the present application contemplates larger “peptide insertions”, e.g. insertion of about three to about five or even up to about ten amino acid residues.
  • the inserted residue(s) may be naturally occurring or non-naturally occurring as disclosed above.
  • amino acid deletion refers to the removal of at least one amino acid residue from a predetermined amino acid sequence.
  • Hinge region is generally defined as stretching from Glu216 to Pro230 of human IgG1 (Burton, Molec. Immunol. 22:161-206 (1985)). Hinge regions of other IgG isotypes may be aligned with the IgG1 sequence by placing the first and last cysteine residues forming inter-heavy chain S—S bonds in the same positions.
  • the “lower hinge region” of an Fc region is normally defined as the stretch of residues immediately C-terminal to the hinge region, i.e. residues 233 to 239 of the Fc region. Prior to the present invention, Fc ⁇ R binding was generally attributed to amino acid residues in the lower hinge region of an IgG Fc region.
  • C1q is a polypeptide that includes a binding site for the Fc region of an immunoglobulin. C1q together with two serine proteases, C1r and C1s, forms the complex C1, the first component of the complement dependent cytotoxicity (CDC) pathway. Human C1q can be purchased commercially from, e.g. Quidel, San Diego, Calif.
  • binding domain refers to the region of a polypeptide that binds to another molecule.
  • the binding domain can comprise a portion of a polypeptide chain thereof (e.g. the a chain thereof) which is responsible for binding an Fc region.
  • One useful binding domain is the extracellular domain of an FcR a chain.
  • antibody is used in the broadest sense and specifically covers monoclonal antibodies (including full length monoclonal antibodies), polyclonal antibodies, multispecific antibodies (e.g., bispecific antibodies), and antibody fragments so long as they exhibit the desired biological activity.
  • Antibody fragments comprise a portion of an intact antibody, generally including the antigen binding or variable region of the intact antibody or the Fc region of an antibody which retains FcR binding capability.
  • antibody fragments include linear antibodies; single-chain antibody molecules; and multispecific antibodies formed from antibody fragments.
  • the antibody fragments preferably retain at least part of the hinge and optionally the CH1 region of an IgG heavy chain. More preferably, the antibody fragments retain the entire constant region of an IgG heavy chain, and include an IgG light chain.
  • 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 antigenic site. Furthermore, in contrast to conventional (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” indicates the character of the antibody as being obtained from a substantially homogeneous population of antibodies, and 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 present 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) and Marks et al., J. Mol. Biol. 222:581-597 (1991), for example.
  • the monoclonal antibodies herein specifically include “chimeric” antibodies (immunoglobulins) 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 antibodies immunoglobulins 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
  • “Humanized” forms of non-human (e.g., murine) antibodies are chimeric antibodies that 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 that are not found in the recipient antibody or in the donor antibody. These modifications are made to further refine antibody performance.
  • 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
  • hypervariable region when used herein refers to the amino acid residues of an antibody which are responsible for antigen-binding.
  • the hypervariable region comprises amino acid residues from a “complementarity determining region” or “CDR” (i.e. residues 24-34 (L1), 50-56 (L2) and 89-97 (L3) in the light chain variable domain and 31-35 (H1), 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. (1991)) and/or those residues from a “hypervariable loop” (i.e.
  • “Framework” or “FR” residues are those variable domain residues other than the hypervariable region residues as herein defined.
  • immunoadhesin designates antibody-like molecules which combine the “binding domain” of a heterologous “adhesin” protein (e.g. a receptor, ligand or enzyme) with an immunoglobulin constant domain.
  • adhesin protein e.g. a receptor, ligand or enzyme
  • the immunoadhesins comprise a fusion of the adhesin amino acid sequence with the desired binding specificity which is other than the antigen recognition and binding site (antigen combining site) of an antibody (i.e. is “heterologous”) and an immunoglobulin constant domain sequence.
  • ligand binding domain refers to any native cell-surface receptor or any region or derivative thereof retaining at least a qualitative ligand binding ability of a corresponding native receptor.
  • the receptor is from a cell-surface polypeptide having an extracellular domain that is homologous to a member of the immunoglobulin supergenefamily.
  • Other receptors which are not members of the immunoglobulin supergenefamily but are nonetheless specifically covered by this definition, are receptors for cytokines, and in particular receptors with tyrosine kinase activity (receptor tyrosine kinases), members of the hematopoietin and nerve growth factor receptor superfamilies, and cell adhesion molecules, e.g. (E-, L- and P-) selectins.
  • receptor binding domain is used to designate any native ligand for a receptor, including cell adhesion molecules, or any region or derivative of such native ligand retaining at least a qualitative receptor binding ability of a corresponding native ligand. This definition, among others, specifically includes binding sequences from ligands for the above-mentioned receptors.
  • an “antibody-immunoadhesin chimera” comprises a molecule that combines at least one binding domain of an antibody (as herein defined) with at least one immunoadhesin (as defined in this application).
  • Exemplary antibody-immunoadhesin chimeras are the bispecific CD4-lgG chimeras described in Berg et al., PNAS ( USA ) 88:4723-4727 (1991) and Chamow et al., J. Immunol. 153:4268 (1994).
  • an “isolated” polypeptide is one that has been identified and separated and/or recovered from a component of its natural environment. Contaminant components of its natural environment are materials that would interfere with diagnostic or therapeutic uses for the polypeptide, and may include enzymes, hormones, and other proteinaceous or nonproteinaceous solutes.
  • the polypeptide will be purified (1) to greater than 95% by weight of polypeptide as determined by the Lowry method, and most preferably more than 99% by weight, (2) to a degree sufficient to obtain at least 15 residues of N-terminal or internal amino acid sequence by use of a spinning cup sequenator, or (3) to homogeneity by SDS-PAGE under reducing or nonreducing conditions using Coomassie blue or, preferably, silver stain.
  • Isolated polypeptide includes the polypeptide in situ within recombinant cells since at least one component of the polypeptide's natural environment will not be present. Ordinarily, however, isolated polypeptide will be prepared by at least one purification step.
  • Treatment refers to both therapeutic treatment and prophylactic or preventative measures. Those in need of treatment include those already with the disorder as well as those in which the disorder is to be prevented.
  • a “disorder” is any condition that would benefit from treatment with the polypeptide variant. This includes chronic and acute disorders or diseases including those pathological conditions which predispose the mammal to the disorder in question.
  • the disorder is cancer.
  • cancer and “cancerous” refer to or describe the physiological condition in mammals that is typically characterized by unregulated cell growth.
  • Examples of cancer include but are not limited to, carcinoma, lymphoma, blastoma, sarcoma, and leukemia.
  • cancers include squamous cell cancer, small-cell lung cancer, non-small cell lung cancer, adenocarcinoma of the lung, squamous carcinoma of the lung, cancer of the peritoneum, hepatocellular cancer, gastrointestinal cancer, pancreatic cancer, glioblastoma, cervical cancer, ovarian cancer, liver cancer, bladder cancer, hepatoma, breast cancer, colon cancer, colorectal cancer, endometrial or uterine carcinoma, salivary gland carcinoma, kidney cancer, liver cancer, prostate cancer, vulval cancer, thyroid cancer, hepatic carcinoma and various types of head and neck cancer.
  • a “HER2-expressing cancer” is one comprising cells which have HER2 receptor protein (Semba et al., PNAS ( USA ) 82:6497-6501 (1985) and Yamamoto et al. Nature 319:230-234 (1986) (Genebank accession number X03363)) present at their cell surface, such that an anti-HER2 antibody is able to bind to the cancer.
  • label when used herein refers to a detectable compound or composition which is conjugated directly or indirectly to the polypeptide.
  • the label may be itself be detectable (e.g., radioisotope labels or fluorescent labels) or, in the case of an enzymatic label, may catalyze chemical alteration of a substrate compound or composition which is detectable.
  • an “isolated” nucleic acid molecule is a nucleic acid molecule that is identified and separated from at least one contaminant nucleic acid molecule with which it is ordinarily associated in the natural source of the polypeptide nucleic acid.
  • An isolated nucleic acid molecule is other than in the form or setting in which it is found in nature. Isolated nucleic acid molecules therefore are distinguished from the nucleic acid molecule as it exists in natural cells.
  • an isolated nucleic acid molecule includes a nucleic acid molecule contained in cells that ordinarily express the polypeptide where, for example, the nucleic acid molecule is in a chromosomal location different from that of natural cells.
  • control sequences refers to DNA sequences necessary for the expression of an operably linked coding sequence in a particular host organism.
  • the control sequences that are suitable for prokaryotes include a promoter, optionally an operator sequence, and a ribosome binding site.
  • Eukaryotic cells are known to utilize promoters, polyadenylation signals, and enhancers.
  • Nucleic acid is “operably linked” when it is placed into a functional relationship with another nucleic acid sequence.
  • DNA for a presequence or secretory leader is operably linked to DNA for a polypeptide if it is expressed as a preprotein that participates in the secretion of the polypeptide;
  • a promoter or enhancer is operably linked to a coding sequence if it affects the transcription of the sequence; or
  • a ribosome binding site is operably linked to a coding sequence if it is positioned so as to facilitate translation.
  • “operably linked” means that the DNA sequences being linked are contiguous, and, in the case of a secretory leader, contiguous and in reading phase. However, enhancers do not have to be contiguous. Linking is accomplished by ligation at convenient restriction sites. If such sites do not exist, the synthetic oligonucleotide adaptors or linkers are used in accordance with conventional practice.
  • the expressions “cell,” “cell line,” and “cell culture” are used interchangeably and all such designations include progeny.
  • the words “transformants” and “transformed cells” include.the primary subject cell and cultures derived therefrom without regard for the number of transfers. It is also understood that all progeny may not be precisely identical in DNA content, due to deliberate or inadvertent mutations. Mutant progeny that have the same function or biological activity as screened for in the originally transformed cell are included. Where distinct designations are intended, it will be clear from the context.
  • molecular complex when used herein refers to the relatively stable structure which forms when two or more heterologous molecules (e.g. polypeptides) bind (preferably noncovalently) to one another.
  • heterologous molecules e.g. polypeptides
  • the preferred molecular complex herein is an immune complex.
  • Immuno complex refers to the relatively stable structure which forms when at least one target molecule and at least one heterologous Fc region-containing polypeptide bind to one another forming a larger molecular weight complex.
  • immune complexes are antigen-antibody aggregates and target molecule-immunoadhesin aggregates.
  • target molecule refers to a molecule, usually a polypeptide, which is capable of being bound by a heterologous molecule and has one or more binding sites for the heterologous molecule.
  • binding site refers to a region of a molecule to which another molecule can bind.
  • the “first target molecule” herein comprises at least two distinct binding sites (for example, two to five separate binding sites) for an analyte (e.g. an Fc region-containing polypeptide) such that at least two analyte molecules can bind to the first target molecule.
  • the two or more binding sites are identical (e.g. having the same amino acid sequence, where the target molecule is a polypeptide).
  • the first target molecule was IgE and had two separate binding sites in the Fc region thereof to which the Fc region-containing polypeptide (an anti-IgE antibody, E27) could bind.
  • Other first target molecules include dimers of substantially identical monomors (e.g. neurotrophins, IL8 and VEGF) or are polypeptides comprising two or more substantially identical polypeptide chains (e.g. antibodies or immunoadhesins).
  • the “second target molecule” comprises at least two distinct binding sites (for example, two to five separate binding sites) for the first target molecule such that at least two first target molecules can bind to the second target molecule.
  • the two or more binding sites are identical (e.g.
  • the second target molecule was VEGF, which has a pair of distinct binding sites to which the variable domain of the IgE antibody could bind.
  • Other second target molecules are contemplated, e.g. other dimers of substantially identical monomers (e.g. neurotrophins or IL8) or poiypeptides comprising two or more substantially identical domains (e.g. antibodies or immunoadhesins).
  • an “analyte” is a substance that is to be analyzed.
  • the preferred analyte is an Fc region-containing polypeptide that is to be analyzed for its ability to bind to an Fc receptor.
  • a “receptor” is a polypeptide capable of binding at least one ligand.
  • the preferred receptor is a cell-surface receptor having an extracellular ligand-binding domain and, optionally, other domains (e.g. transmembrane domain, intracellular domain and/or membrane anchor).
  • the receptor to be evaluated in the assay described herein may be an intact receptor or a fragment or derivative thereof (e.g. a fusion protein comprising the binding domain of the receptor fused to one or more heterologous polypeptides).
  • the receptor to be evaluated for its binding properties may be present in a cell or isolated and optionally coated on an assay plate or some other solid phase.
  • low affinity receptor denotes a receptor that has a weak binding affinity for a ligand of interest, e.g. having a binding constant of about 50 nM or worse affinity.
  • exemplary low affinity receptors include Fc ⁇ RII and Fc ⁇ RIII.
  • the invention herein relates to a method for making a polypeptide variant.
  • the “parent”, “starting” or “nonvariant” polypeptide is prepared using techniques available in the art for generating polypeptides comprising an Fc region.
  • the parent polypeptide is an antibody and exemplary methods for generating antibodies are described in more detail in the following sections.
  • the parent polypeptide may, however, be any other polypeptide comprising an Fc region, e.g. an immunoadhesin. Methods for making immunoadhesins are elaborated in more detail hereinbelow.
  • a variant Fc region may be generated according to the methods herein disclosed and this “variant Fc region” can be fused to a heterologous polypeptide of choice, such as an antibody variable domain or binding domain of a receptor or ligand.
  • the parent polypeptide comprises an Fc region.
  • the Fc region of the parent polypeptide will comprise a native sequence Fc region, and preferably a human native sequence Fc region.
  • the Fc region of the parent polypeptide may have one or more pre-existing amino acid sequence alterations or modifications from a native sequence Fc region.
  • the C1q binding activity of the Fc region may have been previously altered (other types of Fc region modifications are described in more detail below).
  • the parent polypeptide Fc region is “conceptual” and, while it does not physically exist, the antibody engineer may decide upon a desired variant Fc region amino acid sequence and generate a polypeptide comprising that sequence or a DNA encoding the desired variant Fc region amino acid sequence.
  • nucleic acid encoding an Fc region of a parent polypeptide is available and this nucleic acid sequence is altered to generate a variant nucleic acid sequence encoding the Fc region variant.
  • DNA encoding an amino acid sequence variant of the starting polypeptide is prepared by a variety of methods known in the art. These methods include, but are not limited to, preparation by site-directed (or oligonucleotide-mediated) mutagenesis, PCR mutagenesis, and cassette mutagenesis of an earlier prepared DNA encoding the polypeptide
  • Site-directed mutagenesis is a preferred method for preparing substitution variants. This technique is well known in the art (see, e.g., Carter et al. Nucleic Acids Res. 13:4431-4443 (1985) and Kunkel et al., Proc. Natl. Acad.Sci. USA 82:488 (1985)). Briefly, in carrying out site-directed mutagenesis of DNA, the starting DNA is altered by first hybridizing an oligonucleotide encoding the desired mutation to a single strand of such starting DNA.
  • a DNA polymerase is used to synthesize an entire second strand, using the hybridized oligonucleotide as a primer, and using the single strand of the starting DNA as a template.
  • the oligonucleotide encoding the desired mutation is incorporated in the resulting double-stranded DNA.
  • PCR mutagenesis is also suitable for making amino acid sequence variants of the starting polypeptide. See Higuchi, in PCR Protocols, pp.177-183 (Academic Press, 1990); and Vallette et al., Nuc. Acids Res. 17:723-733 (1989). Briefly, when small amounts of template DNA are used as starting material in a PCR, primers that differ slightly in sequence from the corresponding region in a template DNA can be used to generate relatively large quantities of a specific DNA fragment that differs from the template sequence only at the positions where the primers differ from the template.
  • the starting material is the plasmid (or other vector) comprising the starting polypeptide DNA to be mutated.
  • the codon(s) in the starting DNA to be mutated are identified. There must be a unique restriction endonuclease site on each side of the identified mutation site(s). If no such restriction sites exist, they may be generated using the above-described oligonucleotide-mediated mutagenesis method to introduce them at appropriate locations in the starting polypeptide DNA.
  • the plasmid DNA is cut at these sites to linearize it.
  • a double-stranded oligonucleotide encoding the sequence of the DNA between the restriction sites but containing the desired mutation(s) is synthesized using standard procedures, wherein the two strands of the oligonucleotide are synthesized separately and then hybridized together using standard techniques.
  • This double-stranded oligonucleotide is referred to as the cassette.
  • This cassette is designed to have 5′ and 3′ ends that are compatible with the ends of the linearized plasmid, such that it can be directly ligated to the plasmid.
  • This plasmid now contains the mutated DNA sequence.
  • the desired amino acid sequence encoding a polypeptide variant can be determined, and a nucleic acid sequence encoding such amino acid sequence variant can be generated synthetically.
  • the amino acid sequence of the parent polypeptide is modified in order to generate a variant Fc region with altered Fc receptor binding affinity or activity in vitro and/or in vivo and/or altered antibody-dependent cell-mediated cytotoxicity (ADCC) activity in vitro and/or in vivo.
  • ADCC antibody-dependent cell-mediated cytotoxicity
  • the modification entails one or more amino acid substitutions.
  • the replacement residue does not correspond to a residue present in the same position in any of the native sequence Fc regions in FIG. 22A .
  • Pro331 of a human IgG3 or IgG1 Fc region is replaced with a residue other than Ser (the corresponding aligned residue found in native sequence human IgG4).
  • the residue in the parent polypeptide which is substituted with a replacement residue is not an alanine and/or is not residue Ala339 of an Fc region.
  • an amino acid substitution preferably the residue in the parent polypeptide is replaced with an alanine residue.
  • the present invention contemplates replacement of the residue of the parent polypeptide with any other amino acid residue.
  • the substitution may, for example, be a “conservative substitution”. Such conservative substitutions are shown in Table 1 under the heading of “preferred substitution”. More substantial changes may be achieved by making one or more “exemplary substitutions” which are not the preferred substitution in Table 1.
  • Substantial modifications in the biological properties of the Fc region may be 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.
  • Naturally occurring residues are divided into groups based on common side-chain properties:
  • hydrophobic norleucine, met, ala, val, leu, ile
  • Non-conservative substitutions will entail exchanging a member of one of these classes for a member of another class.
  • Conservative and non-conservative amino acid substitutions are exemplified in Table 8 hereinbelow.
  • Example 4 one can engineer an Fc region variant with altered binding affinity for one or more FcRs.
  • different classes of Fc region variants can be made e.g,. as summarized in the following table. Where the variant Fc region has more than one amino acid substitution, generally, but not necessarily, amino acid substitutions in the same class are combined to achieve the desired result.
  • the present invention contemplates other modifications of the parent Fc region amino acid sequence in order to generate an Fc region variant with altered effector function.
  • one will delete one or more of the Fc region residues identified herein as effecting FcR binding (see Example 4 below) in order to generate such an Fc region variant.
  • no more than one to about ten Fc region residues will be deleted according to this embodiment of the invention.
  • the Fc region herein comprising one or more amino acid deletions will preferably retain at least about 80%, and preferably at least about 90%, and most preferably at least about 95%, of the parent Fc region or of a native sequence human Fc region.
  • variant Fc region which (a) mediates antibody-dependent cell-mediated cytotoxicity (ADCC) in the presence of human effector cells more effectively and/or (b) binds an Fc gamma receptor (Fc ⁇ R) with better affinity than the parent polypeptide.
  • ADCC antibody-dependent cell-mediated cytotoxicity
  • Fc ⁇ R Fc gamma receptor
  • Such Fc region variants will generally comprise at least one amino acid modification in the Fc region. Combining amino acid modifications is thought to be particularly desirable.
  • the variant Fc region may include two, three, four, five, etc substitutions therein, e.g. of the specific Fc region positions identified herein.
  • the parent polypeptide Fc region is a human Fc region, e.g. a native sequence human Fc region human IgG1 (A and non-A allotypes), IgG2, IgG3 or IgG4 Fc region. Such sequences are shown in FIG. 23 .
  • the parent polypeptide preferably has pre-existing ADCC activity, e.g., it comprises a human IgG1 or human IgG3 Fc region.
  • the variant with improved ADCC mediates ADCC substantially more effectively than an antibody with a native sequence IgG1 or IgG3 Fc region and the antigen-binding region of the variant.
  • the variant comprises, or consists essentially of, substitutions of two or three of the residues at positions 298, 333 and 334 of the Fc region. Most preferably, residues at positions 298, 333 and 334 are substituted, (e.g. with alanine residues).
  • an Fc region variant with improved binding affinity for Fc ⁇ RIII which is thought to be an important FcR for mediating ADCC.
  • Fc ⁇ RIII an amino acid modification (e.g. a substitution) into the parent Fc region at any one or more of amino acid positions 256, 290, 298, 312, 326, 330, 333, 334, 360, 378 or 430 to generate such a variant.
  • the variant with improved binding affinity for Fc ⁇ RIII may further have reduced binding affinity for Fc ⁇ RII, especially reduced affinity for the inhibiting Fc ⁇ RIIB receptor.
  • the amino acid modification(s) are preferably introduced into the CH2 domain of a Fc region, since the experiments herein indicate that the CH2 domain is important for FcR binding activity. Moreover, unlike the teachings of the above-cited art, the instant application contemplates the introduction of a modification into a part of the Fc region other than in the lower hinge region thereof.
  • Useful amino acid positions for modification in order to generate a variant IgG Fc region with altered Fc gamma receptor (Fc ⁇ R) binding affinity or activity include any one or more of amino acid positions 238, 239, 248, 249, 252, 254, 255, 256, 258, 265, 267, 268, 269, 270, 272, 276, 278, 280, 283, 285, 286, 289, 290, 292, 293, 294, 295, 296, 298, 301, 303, 305, 307, 309, 312, 315, 320, 322, 324, 326, 327, 329, 330, 331, 333, 334, 335, 337, 338, 340, 360, 373, 376, 378, 382, 388, 389, 398, 414, 416, 419, 430, 434, 435, 437, 438 or 439 of the Fc region.
  • Fc ⁇ R Fc gamma receptor
  • the parent Fc region used as the-template to generate such variants comprises a human IgG Fc region.
  • the parent Fc region is preferably not human native sequence IgG3, or the variant Fc region comprising a substitution at position 331 preferably displays increased FcR binding, e.g. to Fc ⁇ RII.
  • Variants which display reduced binding to Fc ⁇ RI include those comprising an Fc region amino acid modification at any one or more of amino acid positions 238, 265, 269, 270, 327 or 329.
  • Variants which display reduced binding to Fc ⁇ RII include those comprising an Fc region amino acid modification at any one or more of amino acid positions 238, 265, 269, 270, 292, 294, 295, 298, 303, 324, 327, 329, 333, 335, 338, 373, 376, 414, 416, 419, 435, 438 or 439.
  • Fc region variants which display reduced binding to Fc ⁇ RIII include those comprising an Fc region amino acid modification at any one or more of amino acid positions 238, 239, 248, 249, 252, 254, 265, 268, 269, 270, 272, 278, 289, 293, 294, 295, 296, 301, 303, 322, 327, 329, 338, 340, 373, 376, 382, 388, 389, 416, 434, 435 or 437.
  • Fc region variants may comprise an amino acid modification at any one or more of amino acid positions 255, 256, 258, 267, 268, 272, 276, 280, 283, 285, 286, 290, 298, 301, 305, 307, 309, 312, 315, 320, 322, 326, 330, 331, 333, 334, 337, 340, 360, 378, 398 or 430 of the Fc region.
  • the variant with improved Fc ⁇ R binding activity may display increased binding to Fc ⁇ RIII, and optionally may further display decreased binding to Fc ⁇ RII; e.g. the variant may comprise an amino acid modification at position 298 and/or 333 of an Fc region.
  • Variants with increased binding to Fc ⁇ RII include those comprising an amino acid modification at any one or more of amino acid positions 255, 256, 258, 267, 268, 272, 276, 280, 283, 285, 286, 290, 301, 305, 307, 309, 312, 315, 320, 322, 326, 330, 331, 337, 340, 378, 398 or 430 of an Fc region.
  • Such variants may further display decreased binding to Fc ⁇ RIII.
  • they may include an Fc region amino acid modification at any one or more of amino acid positions 268, 272, 298, 301, 322 or 340.
  • Fc region variants with altered binding affinity for the neonatal receptor are also contemplated herein.
  • Fc region variants with improved affinity for FcRn are anticipated to have longer serum half-lives, and such molecules will have useful applications in methods of treating mammals where long half-life of the administered polypeptide is desired, e.g., to treat a chronic disease or disorder.
  • Fc region variants with decreased FcRn binding affinity are expected to have shorter half-lives, and such molecules may, for example, be administered to a mammal where a shortened circulation time may be advantageous, e.g.
  • Fc region variants with decreased FcRn binding affinity are anticipated to be less likely to cross the placenta, and thus may be utilized in the treatment of diseases or disorders in pregnant women.
  • Fc region variants with altered binding affinity for FcRn include those comprising an Fc region amino acid modification at any one or more of amino acid positions 238, 252, 253, 254, 255, 256, 265, 272, 286, 288, 303, 305, 307, 309, 311, 312, 317, 340, 356, 360, 362, 376, 378, 380, 382, 386, 388, 400, 413, 415, 424, 433, 434, 435, 436, 439 or 447.
  • Those which display reduced binding to FcRn will generally comprise an Fc region amino acid modification at any one or more of amino acid positions 252, 253, 254, 255, 288, 309, 386, 388, 400, 415, 433, 435, 436, 439 or 447; and those with increased binding to FcRn will usually comprise an Fc region amino acid modification at any one or more of amino acid positions 238, 256, 265, 272, 286, 303, 305, 307, 311, 312, 317, 340, 356, 360, 362, 376, 378, 380, 382, 413, 424 or 434.
  • polypeptide variant(s) prepared as described above may be subjected to further modifications, oftentimes depending on the intended use of the polypeptide. Such modifications may involve further alteration of the amino acid sequence (substitution, insertion and/or deletion of amino acid residues), fusion to heterologous polypeptide(s) and/or covalent modifications. Such “further modifications” may be made prior to, simultaneously with, or following, the amino acid modification(s) disclosed above which result in an alteration of Fc receptor binding and/or ADCC activity. In one embodiment, one may combine the Fc region modification herein with Fc region substitutions disclosed in the references cited in the “Related Art” section of this application.
  • the starting polypeptide of particular interest herein is usually one that binds to C1q and displays complement dependent cytotoxicity (CDC).
  • CDC complement dependent cytotoxicity
  • the further amino acid substitutions described herein will generally serve to alter the ability of the starting polypeptide to bind to C1q and/or modify its complement dependent cytotoxicity function, e.g. to reduce and preferably abolish these effector functions.
  • polypeptides comprising substitutions at one or more of the described positions with improved C1q binding and/or complement dependent cytotoxicity (CDC) function are contemplated herein.
  • the starting polypeptide may be unable to bind C1q and/or mediate CDC and may be modified according to the teachings herein such that it acquires these further effector functions.
  • polypeptides with pre-existing C1q binding activity, optionally further having the ability to mediate CDC may be modified such that one or both of these activities are enhanced.
  • the amino acid positions to be modified are generally selected from heavy chain positions 270, 322, 326, 327, 329, 331, 333, and 334, where the numbering of the residues in an IgG heavy chain is that of the EU index as in Kabat et al., Sequences of Proteins of Immunological Interest, 5th Ed. Public Health Service, National Institutes of Health, Bethesda, Md. (1991). In one embodiment, only one of the eight above-identified positions is altered in order to generate the polypeptide variant region with altered C1q binding and/or complement dependent cytotoxicity (CDC) function.
  • residue 270, 329 or 322 is altered if this is the case.
  • two or more of the above-identified positions are modified. If substitutions are to be combined, generally substitutions which enhance human C1q binding (e.g. at residue positions 326, 327, 333 and 334) or those which diminish human C1q binding (e.g., at residue positions 270, 322, 329 and 331) are combined. In the latter embodiment, all four positions (i.e., 270, 322, 329 and 331) may be substituted.
  • Proline is conserved at position 329 in human IgG's. This residue is preferably replaced with alanine, however substitution with any other amino acid is contemplated, e.g., serine, threonine, asparagine, glycine or valine.
  • Proline is conserved at position 331 in human IgG1, IgG2 and IgG3, but not IgG4 (which has a serine residue at position 331).
  • Residue 331 is preferably replaced by alanine or another amino acid, e.g. serine (for IgG regions other than IgG4), glycine or valine.
  • Lysine 322 is conserved in human IgGs, and this residue is preferably replaced by an alanine residue, but substitution with any other amino acid residue is contemplated, e.g. serine, threonine, glycine or valine.
  • D270 is conserved in human IgGs, and this residue may be replaced by another amino acid residue, e.g. alanine, serine, threonine, glycine, valine, or lysine.
  • K326 is also conserved in human IgGs. This residue may be substituted with another residue including, but not limited to, valine, glutamic acid, alanine, glycine, aspartic acid, methionine or tryptophan, with tryptophan being preferred.
  • E333 is also conserved in human IgGs.
  • E333 is preferably replaced by an amino acid residue with a smaller side chain volume, such as valine, glycine, alanine or serine, with serine being preferred.
  • K334 is conserved in human IgGs and may be substituted with another residue such as alanine or other residue.
  • residue 327 is an alanine. In order to generate a variant with improved C1q binding, this alanine may be substituted with another residue such as glycine. In IgG2 and IgG4, residue 327 is a glycine and this may be replaced by alanine (or another residue) to diminish C1q binding.
  • one can design an Fc region with altered effector function e.g., by modifying C1q binding and/or FcR binding and thereby changing CDC activity and/or ADCC activity.
  • one may increase only one of these activities, and optionally also reduce the other activity, e.g. to generate an Fc region variant with improved ADCC activity, but reduced CDC activity and vice versa.
  • any cysteine residue not involved in maintaining the proper conformation of the polypeptide variant also may be substituted, generally with serine, to improve the oxidative stability of the molecule and prevent aberrant cross linking.
  • Another type of amino acid substitution serves to alter the glycosylation pattern of the polypeptide. This may be achieved by deleting one or more carbohydrate moieties found in the polypeptide, and/or adding one or more glycosylation sites that are not present in the polypeptide.
  • Glycosylation of polypeptides is typically either N-linked or O-linked. 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.
  • 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 may also be used.
  • Addition of glycosylation sites to the polypeptide 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 may also be made by the addition of, or substitution by, one or more serine or threonine residues to the sequence of the original polypeptide (for O-linked glycosylation sites).
  • An exemplary glycosylation variant has an amino acid substitution of residue Asn 297 of the heavy chain.
  • the class, subclass or allotype of the Fc region may be altered by one or more further amino acid substitutions to generate an Fc region with an amino acid sequence more homologous to a different class, subclass or allotype as desired.
  • a murine Fc region may be altered to generate an amino acid sequence more homologous to a human Fc region; a human non-A allotype IgG1 Fc region may be modified to achieve a human A allotype IgG1 Fc region etc.
  • the amino modification(s) herein which alter FcR binding and/or ADCC activity are made in the CH2 domain of the Fc region and the CH3 domain is deleted or replaced with another dimerization domain. Preferably, however, the CH3 domain is retained (aside from amino acid modifications therein which alter effector function as herein disclosed).
  • the polypeptide variant may be subjected to one or more assays to evaluate any change in biological activity compared to the starting polypeptide.
  • the polypeptide variant essentially retains the ability to bind antigen compared to the nonvariant polypeptide, i.e. the binding capability is no worse than about 20 fold, e.g. no worse than about 5 fold of that of the nonvariant polypeptide.
  • the binding capability of the polypeptide variant may be determined using techniques such as fluorescence activated cell sorting (FACS) analysis or radioimmunoprecipitation (RIA), for example.
  • the ability of the polypeptide variant to bind an FcR may be evaluated.
  • the FcR is a high affinity Fc receptor, such as Fc ⁇ RI, FcRn or Fc ⁇ RIIIA-V158
  • binding can be measured by titrating monomeric polypeptide variant and measuring bound polypeptide variant using an antibody which specifically binds to the polypeptide variant in a standard ELISA format (see Example 2 below).
  • Another FcR binding assay for low affinity FcRs is described in Examples 1 and 4.
  • ADCC activity of the polypeptide variant may be assessed in vivo, e.g., in a animal model such as that disclosed in Clynes et al. PNAS ( USA ) 95:652-656 (1998).
  • the ability of the variant to bind C1q and mediate complement dependent cytotoxicity (CDC) may be assessed.
  • a C1q binding ELISA may be performed. Briefly, assay plates may be coated overnight at 4° C. with polypeptide variant or starting polypeptide (control) in coating buffer. The plates may then be washed and blocked. Following washing, an aliquot of human C1q may be added to each well and incubated for 2 hrs at room temperature. Following a further wash, 100 ⁇ l of a sheep anti-complement C1q peroxidase conjugated antibody may be added to each well and incubated for 1 hour at room temperature. The plate may again be washed with wash buffer and 100 ⁇ l of substrate buffer containing OPD (0-phenylenediamine dihydrochloride (Sigma)) may be added to each well. The oxidation reaction, observed by the appearance of a yellow color, may be allowed to proceed for 30 minutes and stopped by the addition of 100 ⁇ l of 4.5 N H 2 SO 4 . The absorbance may then read at (492-405) nm.
  • An exemplary polypeptide variant is one that displays a “significant reduction in C1q binding” in this assay. This means that about 100 ⁇ g/ml of the polypeptide variant displays about 50 fold or more reduction in C1q binding compared to 100 ⁇ g/ml of a control antibody having a nonmutated IgG1 Fc region. In the most preferred embodiment, the polypeptide variant “does not bind C1q”, i.e. 100 ⁇ g/ml of the polypeptide variant displays about 100 fold or more reduction in C1q binding compared to 1001 ⁇ g/ml of the control antibody.
  • Another exemplary variant is one which “has a better binding affinity for human C1q than the parent polypeptide”.
  • a molecule may display, for example, about two-fold or more, and preferably about five-fold or more, improvement in human C1q binding compared to the parent polypeptide (e.g. at the IC 50 values for these two molecules).
  • human C1q binding may be about two-fold to about 500-fold, and preferably from about two-fold or from about five-fold to about 1000-fold improved compared to the parent polypeptide.
  • a complement dependent cytotoxicity (CDC) assay may be performed, e.g. as described in Gazzano-Santoro et al., J. Immunol. Methods 202:163 (1997). Briefly, various concentrations of the polypeptide variant and human complement may be diluted with buffer. Cells which express the antigen to which the polypeptide variant binds may be diluted to a density of ⁇ 1 ⁇ 10 6 cells/ml. Mixtures of polypeptide variant, diluted human complement and cells expressing the antigen may be added to a flat bottom tissue culture 96 well plate and allowed to incubate for 2 hrs at 37° C. and 5% CO 2 to facilitate complement mediated cell lysis.
  • CDC complement dependent cytotoxicity
  • alamar blue (Accumed International) may then be added to each well and incubated overnight at 37° C.
  • the absorbance is measured using a 96-well fluorometer with excitation at 530 nm and emission at 590 nm.
  • the results may be expressed in relative fluorescence units (RFU).
  • the sample concentrations may be computed from a standard curve and the percent activity as compared to nonvariant polypeptide is reported for the polypeptide variant of interest.
  • Yet another exemplary variant “does not activate complement”.
  • 0.6 ⁇ g/ml of the polypeptide variant displays about 0-10% CDC activity in this assay compared to a 0.6 ⁇ g/ml of a control antibody having a nonmutated IgG1 Fc region.
  • the variant does not appear to have any CDC activity in the above CDC assay.
  • the invention also pertains to a polypeptide variant with enhanced CDC compared to a parent polypeptide, e.g., displaying about two-fold to about 100-fold improvement in CDC activity in vitro or in vivo (e.g. at the IC50 values for each molecule being compared).
  • a receptor binding assay has been developed herein which is particularly useful for determining binding of an analyte of interest to a receptor where the affinity of the analyte for the receptor is relatively weak, e.g. in the micromolar range as is the case for Fc ⁇ RIIA, Fc ⁇ RIIB, Fc ⁇ RIIIA and Fc ⁇ RIIIB.
  • the method involves the formation of a molecular complex that has an improved avidity for the receptor of interest compared to the noncomplexed analyte.
  • the preferred molecular complex is an immune complex comprising: (a) an Fc region-containing polypeptide (such as an antibody or an immunoadhesin); (b) a first target molecule which comprises at least two binding sites for the Fc region-containing polypeptide; and (c) a second target molecule which comprises at least two binding sites for the first target molecule.
  • an Fc region-containing polypeptide such as an antibody or an immunoadhesin
  • a first target molecule which comprises at least two binding sites for the Fc region-containing polypeptide
  • a second target molecule which comprises at least two binding sites for the first target molecule.
  • the Fc region-containing polypeptide is an anti-IgE antibody, such as the E27 antibody ( FIGS. 4A-4B ).
  • E27 when mixed with human IgE at an 1:1 molar ratio, forms a stable hexamer consisting of three E27 molecules and three IgE molecules.
  • the “first target molecule” is a chimeric form of IgE in which the Fab portion of an anti-VEGF antibody is fused to the human IgE Fc portion and the “second target molecule” is the antigen to which the Fab binds (i.e. VEGF).
  • VEGF antigen to which the Fab binds
  • VEGF also binds two molecules of IgE per molecule of VEGF.
  • recombinant human VEGF was added at a 2:1 molar ratio to IgE:E27 hexamers, the hexamers were linked into larger molecular weight complexes via the IgE:VEGF interaction ( FIG. 5 ).
  • the Fc region of the anti-IgE antibody of the resultant immune complex binds to FcR with higher avidity than either uncomplexed anti-IgE or anti-IgE:IgE hexamers.
  • Examples comprising only an Fc region-containing polypeptide:first target molecule combination include an immunoadhesin:ligand combination such as VEGF receptor (KDR)-immunoadhesin:VEGF and a full-length bispecific antibody (bsAb):first target molecule.
  • an Fc region-containing polypeptide:first target molecule:second target molecule combination include a nonblocking antibody:soluble receptor:ligand combination such as anti-Trk antibody:soluble Trk receptor:neurotrophin (Urfer et al. J. Biol. Chem. 273(10):5829-5840 (1998)).
  • the immune complexes described above have further uses including evaluation of Fc region-containing polypeptide function and immune complex clearance in vivo.
  • the immune complex may be administered to a mammal (e.g. in a pre-clinical animal study) and evaluated for its half-life etc.
  • a polypeptide comprising at least the binding domain of the receptor of interest may be coated on solid phase, such as an assay plate.
  • the binding domain of the receptor alone or a receptor-fusion protein may be coated on the plate using standard procedures.
  • receptor-fusion proteins include receptor-glutathione S-transferase (GST) fusion protein, receptor-chitin binding domain fusion protein, receptor-hexaHis tag fusion protein (coated on glutathione, chitin, and nickel coated plates, respectively).
  • GST receptor-glutathione S-transferase
  • a capture molecule may be coated on the assay plate and used to bind the receptor-fusion protein via the non-receptor portion of the fusion protein.
  • Examples include anti-hexaHis F(ab′) 2 coated on the assay plate used to capture receptor-hexaHis tail fusion or anti-GST antibody coated on the assay plate used to capture a receptor-GST fusion.
  • binding to cells expressing at least the binding domain of the receptor may be evaluated.
  • the cells may be naturally occurring hematopoietic cells that express the FcR of interest or may be transformed with nucleic acid encoding the FcR or a binding domain thereof such that the binding domain is expressed at the surface of the cell to be tested.
  • the immune complex described hereinabove is added to the receptor-coated plates and incubated for a sufficient period of time such that the analyte binds to the receptor. Plates may then be washed to remove unbound complexes, and binding of the analyte may be detected according to known methods. For example, binding may be detected using a reagent (e.g. an antibody or fragment thereof) which binds specifically to the analyte, and which is optionally conjugated with a detectable label (detectable labels and methods for conjugating them to polypeptides are described below in the section entitled “Non-Therapeutic Uses for the Polypeptide Variant”).
  • a reagent e.g. an antibody or fragment thereof
  • the reagents can be provided in an assay kit, i.e., a packaged combination of reagents, for combination with the analyte in assaying the ability of the analyte to bind to a receptor of interest.
  • the components of the kit will generally be provided in predetermined ratios.
  • the kit may provide the first target molecule and/or the second target molecule, optionally complexed together.
  • the kit may further include assay plates coated with the receptor or a binding domain thereof (e.g. the extracellular domain of the a subunit of an FcR).
  • kits such as an antibody that binds specifically to the analyte to be assayed, labeled directly or indirectly with an enzymatic label
  • the detectable label is an enzyme
  • the kit will include substrates and cofactors required by the enzyme (e.g. a substrate precursor which provides the detectable chromophore or fluorophore).
  • other additives may be included such as stabilizers, buffers (e.g. assay and/or wash lysis buffer) and the like.
  • the relative amounts of the various reagents may be varied widely to provide for concentrations in solution of the reagents that substantially optimize the sensitivity of the assay.
  • the reagents may be provided as dry powders, usually lyophilized, including excipients that on dissolution will provide a reagent solution having the appropriate concentration.
  • the kit also suitably includes instructions for carrying out the assay.
  • the Fc region-containing polypeptide which is modified according to the teachings herein is an antibody. Techniques for producing antibodies follow:
  • the polypeptide is an antibody
  • it is directed against an antigen of interest.
  • the antigen is a biologically important polypeptide and administration of the antibody to a mammal suffering from a disease or disorder can result in a therapeutic benefit in that mammal.
  • antibodies directed against nonpolypeptide antigens are also contemplated.
  • the antigen is a polypeptide, it may be a transmembrane molecule (e.g. receptor) or ligand such as a growth factor.
  • exemplary antigens include molecules such as renin; a growth hormone, including human growth hormone and bovine growth hormone; growth hormone releasing factor; parathyroid hormone; thyroid stimulating hormone; lipoproteins; alpha-1-antitrypsin; insulin A-chain; insulin B-chain; proinsulin; follicle stimulating hormone; calcitonin; luteinizing hormone; glucagon; clotting factors such as factor VIIIC, factor IX, tissue factor (TF), and von Willebrands factor; anti-clotting factors such as Protein C; atrial natriuretic factor; lung surfactant; a plasminogen activator, such as urokinase or human urine or tissue-type plasminogen activator (t-PA); bombesin; thrombin; hemopoietic growth factor; tumor necrosis factor-alpha and
  • CD proteins such as CD3, CD4, CD8, CD19, CD20 and CD34
  • members of the ErbB receptor family such as the EGF receptor, HER2, HER3 or HER4 receptor
  • cell adhesion molecules such as LFA-1, Mac1, p150.95, VLA-4, ICAM-1, VCAM, ⁇ 4/ ⁇ 7 integrin, and ⁇ v/ ⁇ 3 integrin including either ⁇ or ⁇ subunits thereof (e.g.
  • anti-CD11a, anti-CD18 or anti-CD11b antibodies growth factors such as VEGF; tissue factor (TF); alpha interferon ( ⁇ -IFN); an interleukin, such as IL-8; IgE; blood group antigens; flk2/flt3 receptor; obesity (OB) receptor; mpl receptor; CTLA-4; protein C etc.
  • growth factors such as VEGF; tissue factor (TF); alpha interferon ( ⁇ -IFN); an interleukin, such as IL-8; IgE; blood group antigens; flk2/flt3 receptor; obesity (OB) receptor; mpl receptor; CTLA-4; protein C etc.
  • Soluble antigens or fragments thereof, optionally conjugated to other molecules, can be used as immunogens for generating antibodies.
  • immunogens for transmembrane molecules, such as receptors, fragments of these (e.g. the extracellular domain of a receptor) can be used as the immunogen.
  • transmembrane molecules such as receptors
  • fragments of these e.g. the extracellular domain of a receptor
  • cells expressing the transmembrane molecule can be used as the immunogen.
  • Such cells can be derived from a natural source (e.g. cancer cell lines) or may be cells which have been transformed by recombinant techniques to express the transmembrane molecule.
  • Other antigens and forms thereof useful for preparing antibodies will be apparent to those in the art.
  • Polyclonal antibodies are preferably raised in animals by multiple subcutaneous (sc) or intraperitoneal (ip) injections of the relevant antigen and an adjuvant. It may be useful to conjugate the relevant antigen to a protein that is immunogenic in the species to be immunized, e.g., keyhole limpet hemocyanin, serum albumin, bovine thyroglobulin, or soybean trypsin inhibitor using a bifunctional or derivatizing agent, for example, maleimidobenzoyl sulfosuccinimide ester (conjugation through cysteine residues), N-hydroxysuccinimide (through lysine residues), glutaraldehyde, succinic anhydride, SOCl 2 , or R 1 N ⁇ C ⁇ NR, where R and R 1 are different alkyl groups.
  • a protein that is immunogenic in the species to be immunized e.g., keyhole limpet hemocyanin, serum albumin, bovine thy
  • Animals are 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.
  • Monoclonal antibodies may be made using the hybridoma method first described by Kohler et al., Nature, 256:495 (1975), or may be made by recombinant DNA methods (U.S. Pat. No. 4,816,567).
  • 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 may 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 (Goding, 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. Immunol., 133:3001 (1984); Brodeur et al, Monoclonal Antibody Production Techniques and Applications, pp. 51-63 (Marcel Dekker, Inc., New York, 1987)).
  • 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 may be subcloned by limiting dilution procedures and grown by standard methods (Goding, 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 may be grown in vivoas 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 is 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 may 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 will be described in more detail below.
  • antibodies or antibody fragments can be isolated 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.
  • the DNA also may be modified, for example, by substituting the coding sequence for human heavy- and light-chain constant domains in place of the homologous murine sequences (U.S. Pat. No.4,816,567; Morrison, et al., Proc. Natl Acad. Sci. USA, 81:6851 (1984)), or by covalently joining to the immunoglobulin coding sequence all or part of the coding sequence for a non-immunoglobulin polypeptide.
  • non-immunoglobulin polypeptides are substituted for the constant domains of an antibody, or they are substituted for the variable domains of one antigen-combining site of an antibody to create a chimeric bivalent antibody comprising one antigen-combining site having specificity for an antigen and another antigen-combining site having specificity for a different antigen.
  • 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 al., Nature, 321:522-525 (1986); Riechmann et al., Nature, 332:323-327 (1988); Verhoeyen et al., Science, 239:1534-1536 (1988)), 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
  • the choice of human variable domains, both light and heavy, to be used in making the humanized antibodies is very important to reduce antigenicity.
  • the 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 al., J. 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.
  • the same framework may be used for several different humanized antibodies (Carter et al., Proc. Natl. Acad. Sci. USA, 89:4285 (1992); Presta et al., J. Immnol., 151:2623 (1993)).
  • 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 immunoglobulin sequences. Inspection of these displays permits analysis of the likely role of the residues in the functioning of the candidate immunoglobulin sequence, i.e., the analysis of residues that influence the ability of the candidate immunoglobulin to bind its antigen.
  • FR residues can be selected and combined from the recipient and import sequences so that the desired antibody characteristic, such as increased affinity for the target antigen(s), is achieved.
  • the CDR residues are directly and most substantially involved in influencing antigen binding.
  • transgenic animals e.g., mice
  • transgenic animals e.g., mice
  • J H antibody heavy-chain joining region
  • Human antibodies can also be derived from phage-display libraries (Hoogenboom et al., J. Mol. Biol., 227:381 (1991); Marks et al., J. Mol. Biol., 222:581-597 (1991); Vaughan et al. Nature Biotech 14:309 (1996)).
  • Multispecific antibodies have binding specificities for at least two different antigens. While such molecules normally will only bind two antigens (i.e. bispecific antibodies, BsAbs), antibodies with additional specificities such as trispecific antibodies are encompassed by this expression when used herein.
  • BsAbs include those with one arm directed against a tumor cell antigen and the other arm directed against a cytotoxic trigger molecule such as anti-Fc ⁇ RI/anti-CD15, anti-p185 HER2 /Fc ⁇ RIII (CD16), anti-CD3/anti-malignant B-cell (1D10), anti-CD3/anti-p185 HER2 , anti-CD3/anti-p97, anti-CD3/anti-renal cell carcinoma, anti-CD3/anti-OVCAR-3, anti-CD3/L-D1 (anti-colon carcinoma), anti-CD3/anti-melanocyte stimulating hormone analog, anti-EGF receptor/anti-CD3, anti-CD3/anti-CAMA1, anti-CD3/anti-CD19, anti-CD3/MoV18, anti-neural cell ahesion molecule (NCAM)/anti-CD3, anti-folate binding protein (FBP)/anti-CD3, anti-pan carcinoma associated antigen (AMOC-31)/anti-CD3; BsAbs with one arm which binds
  • BsAbs for use in therapy of infectious diseases such as anti-CD3/anti-herpes simplex virus (HSV), anti-T-cell receptor:CD3 complex/anti-influenza, anti-Fc ⁇ R/anti-HIV; BsAbs for tumor detection in vitro or in vivo such as anti-CEA/anti-EOTUBE, anti-CEA/anti-DPTA, anti-p185 HER2 /anti-hapten; BsAbs as vaccine adjuvants; and BsAbs as diagnostic tools such as anti-rabbit IgG/anti-ferritin, anti-horse radish peroxidase (HRP)/anti-hormone, anti-somatostatin/anti-substance P, anti-HRP/anti-FITC, anti-CEA/anti- ⁇ -galactosidase.
  • HRP anti-horse radish peroxidase
  • HRP anti-somatostatin/anti-substance P
  • trispecific antibodies examples include anti-CD3/anti-CD4/anti-CD37, anti-CD3/anti-CD5/anti-CD37 and anti-CD3/anti-CD8/anti-CD37.
  • Bispecific antibodies can be prepared as full length antibodies or antibody fragments (e.g. F(ab′) 2 bispecific antibodies).
  • bispecific antibodies are known in the art. Traditional production of full length bispecific antibodies is based on the coexpression of two immunoglobulin heavy chain-light chain pairs, where the two chains have different specificities (Millstein et al., Nature, 305:537-539 (1983)). Because of the random assortment of immunoglobulin heavy and light chains, these hybridomas (quadromas) produce a potential mixture of 10 different antibody molecules, of which only one has the correct bispecific structure. Purification of the correct molecule, which is usually done by affinity chromatography steps, is rather cumbersome, and the product yields are low. Similar procedures are disclosed in WO 93/08829, and in Traunecker et al., EMBO J., 10:3655-3659 (1991).
  • antibody variable domains with the desired binding specificities are fused to immunoglobulin constant domain sequences.
  • the fusion preferably is with an immunoglobulin heavy chain constant domain, comprising at least part of the hinge, CH2, and CH3 regions. It is preferred to have the first heavy-chain constant region (CH1) containing the site necessary for light chain binding, present in at least one of the fusions.
  • DNAs encoding the immunoglobulin heavy chain fusions and, if desired, the immunoglobulin light chain are inserted into separate expression vectors, and are co-transfected into a suitable host organism.
  • the bispecific antibodies are composed of a hybrid immunoglobulin heavy chain with a first binding specificity in one arm, and a hybrid immunoglobulin heavy chain-light chain pair (providing a second binding specificity) in the other arm. It was found that this asymmetric structure facilitates the separation of the desired bispecific compound from unwanted immunoglobulin chain combinations, as the presence of an immunoglobulin light chain in only one half of the bispecific molecule provides for a facile way of separation. This approach is disclosed in WO 94/04690. For further details of generating bispecific antibodies see, for example, Suresh et al., Methods in Enzymology, 121:210 (1986).
  • the interface between a pair of antibody molecules can be engineered to maximize the percentage of heterodimers which are recovered from recombinant cell culture.
  • the preferred interface comprises at least a part of the CH3 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.
  • Bispecific antibodies include cross-linked or “heteroconjugate” antibodies.
  • 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 may 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.
  • Antibodies with more than two valencies are contemplated.
  • trispecific antibodies can be prepared. Tutt et al. J. Immunol. 147: 60 (1991).
  • polypeptide of interest herein is preferably an antibody
  • Fc region-containing polypeptides which can be modified according to the methods described herein are contemplated.
  • An example of such a molecule is an immunoadhesin.
  • the simplest and most straightforward immunoadhesin design combines the binding domain(s) of the adhesin (e.g. the extracellular domain (ECD) of a receptor) with the Fc region of an immunoglobulin heavy chain.
  • ECD extracellular domain
  • nucleic acid encoding the binding domain of the adhesin will be fused C-terminally to nucleic acid encoding the N-terminus of an immunoglobulin constant domain sequence, however N-terminal fusions are also possible.
  • the encoded chimeric polypeptide will retain at least functionally active hinge, C H 2 and C H 3 domains of the constant region of an immunoglobulin heavy chain. Fusions are also made to the C-terminus of the Fc portion of a constant domain, or immediately N-terminal to the C H 1 of the heavy chain or the corresponding region of the light chain.
  • the precise site at which the fusion is made is not critical; particular sites are well known and may be selected in order to optimize the biological activity, secretion, or binding characteristics of the immunoadhesin.
  • the adhesin sequence is fused to the N-terminus of the Fc region of immunoglobulin G 1 (IgG 1 ). It is possible to fuse the entire heavy chain constant region to the adhesin sequence. However, more preferably, a sequence beginning in the hinge region just upstream of the papain-cleavage site which defines IgG Fc chemically (i.e. residue 216, taking the first residue of heavy chain constant region to be 114), or analogous sites of other immunoglobulins is used in the fusion.
  • the adhesin amino acid sequence is fused to (a) the hinge region and C H 2 and C H 3 or (b) the C H 1, hinge, C H 2 and C H 3 domains, of an IgG heavy chain.
  • the immunoadhesins are assembled as multimers, and particularly as heterodimers or heterotetramers.
  • these assembled immunoglobulins will have known unit structures.
  • a basic four chain structural unit is the form in which IgG, IgD, and IgE exist.
  • a four chain unit is repeated in the higher molecular weight immunoglobulins; IgM generally exists as a pentamer of four basic units held together by disulfide bonds.
  • IgA globulin, and occasionally IgG globulin may also exist in multimeric form in serum. In the case of multimer, each of the four units may be the same or different.
  • each A represents identical or different adhesin amino acid sequences
  • V L is an immunoglobulin light chain variable domain
  • V H is an immunoglobulin heavy chain variable domain
  • C L is an immunoglobulin light chain constant domain
  • C H is an immunoglobulin heavy chain constant domain
  • n is an integer greater than 1;
  • Y designates the residue of a covalent cross-linking agent.
  • the adhesin sequences can be inserted between immunoglobulin heavy chain and light chain sequences, such that an immunoglobulin comprising a chimeric heavy chain is obtained.
  • the adhesin sequences are fused to the 3′ end of an immunoglobulin heavy chain in each arm of an immunoglobulin, either between the hinge and the C H 2 domain, or between the C H 2 and C H 3 domains. Similar constructs have been reported by Hoogenboom, et al., Mol. Immunol. 28:1027-1037 (1991).
  • an immunoglobulin light chain might be present either covalently associated to an adhesin-immunoglobulin heavy chain fusion polypeptide, or directly fused to the adhesin.
  • DNA encoding an immunoglobulin light chain is typically coexpressed with the DNA encoding the adhesin-immunoglobulin heavy chain fusion protein.
  • the hybrid heavy chain and the light chain will be covalently associated to provide an immunoglobulin-like structure comprising two disulfide-linked immunoglobulin heavy chain-light chain pairs.
  • Immunoadhesins are most conveniently constructed by fusing the cDNA sequence encoding the adhesin portion in-frame to an immunoglobulin cDNA sequence.
  • fusion to genomic immunoglobulin fragments can also be used (see, e.g. Aruffo et al., Cell 61:1303-1313 (1990); and Stamenkovic et al., Cell 66:1133-1144 (1991)).
  • the latter type of fusion requires the presence of Ig regulatory sequences for expression.
  • cDNAs encoding IgG heavy-chain constant regions can be isolated based on published sequences from cDNA libraries derived from spleen or peripheral blood lymphocytes, by hybridization or by polymerase chain reaction (PCR) techniques.
  • the cDNAs encoding the “adhesin” and the immunoglobulin parts of the immunoadhesin are inserted in tandem into a plasmid vector that directs efficient expression in the chosen host cells.
  • the invention also provides isolated nucleic acid encoding a polypeptide variant as disclosed herein, vectors and host cells comprising the nucleic acid, and recombinant techniques for the production of the polypeptide variant.
  • the nucleic acid encoding it is isolated and inserted into a replicable vector for further cloning (amplification of the DNA) or for expression.
  • DNA encoding the polypeptide variant is readily isolated and sequenced using conventional procedures (e.g., by using oligonucleotide probes that are capable of binding specifically to genes encoding the polypeptide variant).
  • Many vectors are available.
  • the vector components generally include, but are not limited to, one or more of the following: a signal sequence, an origin of replication, one or more marker genes, an enhancer element, a promoter, and a transcription termination sequence.
  • polypeptide variant of this invention may be produced recombinantly not only directly, but also as a fusion polypeptide with a heterologous polypeptide, which is preferably a signal sequence or other polypeptide having a specific cleavage site at the N-terminus of the mature protein or polypeptide.
  • a heterologous polypeptide which is preferably a signal sequence or other polypeptide having a specific cleavage site at the N-terminus of the mature protein or polypeptide.
  • the heterologous signal sequence selected preferably is one that is recognized and processed (i.e., cleaved by a signal peptidase) by the host cell.
  • the signal sequence is substituted by a prokaryotic signal sequence selected, for example, from the group of the alkaline phosphatase, penicillinase, lpp, or heat-stable enterotoxin II leaders.
  • a prokaryotic signal sequence selected, for example, from the group of the alkaline phosphatase, penicillinase, lpp, or heat-stable enterotoxin II leaders.
  • yeast secretion the native signal sequence may be substituted by, e.g., the yeast invertase leader, a factor leader (including Saccharomyces and Kluyveromyces ⁇ -factor leaders), or acid phosphatase leader, the C. albicans glucoamylase leader, or the signal described in WO 90/13646.
  • mammalian signal sequences as well as viral secretory leaders for example, the herpes simplex gD signal, are available.
  • the DNA for such precursor region is ligated in reading frame to DNA encoding the polypeptide variant.
  • Both expression and cloning vectors contain a nucleic acid sequence that enables the vector to replicate in one or more selected host cells.
  • this sequence is one that enables the vector to replicate independently of the host chromosomal DNA, and includes origins of replication or autonomously replicating sequences.
  • origins of replication or autonomously replicating sequences are well known for a variety of bacteria, yeast, and viruses.
  • the origin of replication from the plasmid pBR322 is suitable for most Gram-negative bacteria, the 2 ⁇ plasmid origin is suitable for yeast, and various viral origins (SV40, polyoma, adenovirus, VSV or BPV) are useful for cloning vectors in mammalian cells.
  • the origin of replication component is not needed for mammalian expression vectors (the SV40 origin may typically be used only because it contains the early promoter).
  • Selection genes may contain a selection gene, also termed a selectable marker.
  • Typical selection genes encode proteins that (a) confer resistance to antibiotics or other toxins, e.g., ampicillin, neomycin, methotrexate, or tetracycline, (b) complement auxotrophic deficiencies, or (c) supply critical nutrients not available from complex media, e.g., the gene encoding D-alanine racemase for Bacilli.
  • One example of a selection scheme utilizes a drug to arrest growth of a host cell. Those cells that are successfully transformed with a heterologous gene produce a protein conferring drug resistance and thus survive the selection regimen. Examples of such dominant selection use the drugs neomycin, mycophenolic acid and hygromycin.
  • suitable selectable markers for mammalian cells are those that enable the identification of cells competent to take up the polypeptide variant nucleic acid, such as DHFR, thymidine kinase, met allothionein-I and -II, preferably primate met allothionein genes, adenosine deaminase, ornithine decarboxylase, etc.
  • cells transformed with the DHFR selection gene are first identified by culturing all of the transformants in a culture medium that contains methotrexate (Mtx), a competitive antagonist of DHFR.
  • Mtx methotrexate
  • An appropriate host cell when wild-type DHFR is employed is the Chinese hamster ovary (CHO) cell line deficient in DHFR activity.
  • host cells transformed or co-transformed with DNA sequences encoding polypeptide variant, wild-type DHFR protein, and another selectable marker such as aminoglycoside 3′-phosphotransferase (APH) can be selected by cell growth in medium containing a selection agent for the selectable marker such as an aminoglycosidic antibiotic, e.g., kanamycin, neomycin, or G418. See U.S. Pat. No. 4,965,199.
  • APH aminoglycoside 3′-phosphotransferase
  • a suitable selection gene for use in yeast is the trp1 gene present in the yeast plasmid YRp7 (Stinchcomb et al., Nature, 282:39 (1979)).
  • the trp1 gene provides a selection marker for a mutant strain of yeast lacking the ability to grow in tryptophan, for example, ATCC No.44076 or PEP4-1. Jones, Genetics, 85:12 (1977).
  • the presence of the trp1 lesion in the yeast host cell genome then provides an effective environment for detecting transformation by growth in the absence of tryptophan.
  • Leu2-deficient yeast strains (ATCC 20,622 or 38,626) are complemented by known plasmids bearing the Leu2 gene.
  • vectors derived from the 1.6 ⁇ m circular plasmid pKD1 can be used for transformation of Kluyveromyces yeasts.
  • an expression system for large-scale production of recombinant calf chymosin was reported for K. lactis. Van den Berg, Bio/Technology, 8:135 (1990).
  • Stable multi-copy expression vectors for secretion of mature recombinant human serum albumin by industrial strains of Kluyveromyces have also been disclosed. Fleer et al., Bio/Technology, 9:968-975 (1991).
  • Expression and cloning vectors usually contain a promoter that is recognized by the host organism and is operably linked to the polypeptide variant nucleic acid.
  • Promoters suitable for use with prokaryotic hosts include the phoA promoter, ⁇ -lactamase and lactose promoter systems, alkaline phosphatase, a tryptophan (trp) promoter system, and hybrid promoters such as the tac promoter.
  • trp tryptophan
  • Other known bacterial promoters are suitable. Promoters for use in bacterial systems also will contain a Shine-Dalgarno (S.D.) sequence operably linked to the DNA encoding the polypeptide variant.
  • S.D. Shine-Dalgarno
  • Promoter sequences are known for eukaryotes. Virtually all eukaryotic genes have an AT-rich region located approximately 25 to 30 bases upstream from the site where transcription is initiated. Another sequence found 70 to 80 bases upstream from the start of transcription of many genes is a CNCAAT region where N may be any nucleotide. At the 3′ end of most eukaryotic genes is an AATAAA sequence that may be the signal for addition of the poly A tail to the 3′ end of the coding sequence. All of these sequences are suitably inserted into eukaryotic expression vectors.
  • suitable promoting sequences for use with yeast hosts include the promoters for 3-phosphoglycerate kinase or other glycolytic enzymes, such as enolase, glyceraldehyde-3-phosphate dehydrogenase, hexokinase, pyruvate decarboxylase, phosphofructokinase, glucose-6-phosphate isomerase, 3-phosphoglycerate mutase, pyruvate kinase, triosephosphate isomerase, phosphoglucose isomerase, and glucokinase.
  • 3-phosphoglycerate kinase or other glycolytic enzymes such as enolase, glyceraldehyde-3-phosphate dehydrogenase, hexokinase, pyruvate decarboxylase, phosphofructokinase, glucose-6-phosphate isomerase, 3-phosphoglycerate mutase, pyruvate
  • yeast promoters which are inducible promoters having the additional advantage of transcription controlled by growth conditions, are the promoter regions for alcohol dehydrogenase 2, isocytochrome C, acid phosphatase, degradative enzymes associated with nitrogen metabolism, met allothionein, glyceraldehyde-3-phosphate dehydrogenase, and enzymes responsible for maltose and galactose utilization.
  • Suitable vectors and promoters for use in yeast expression are further described in EP 73,657.
  • Yeast enhancers also are advantageously used with yeast promoters.
  • Polypeptide variant transcription from vectors in mammalian host cells is controlled, for example, by promoters obtained from the genomes of viruses such as polyoma virus, fowlpox virus, adenovirus (such as Adenovirus 2), bovine papilloma virus, avian sarcoma virus, cytomegalovirus, a retrovirus, hepatitis-B virus and most preferably Simian Virus 40 (SV40), from heterologous mammalian promoters, e.g., the actin promoter or an immunoglobulin promoter, from heat-shock promoters, provided such promoters are compatible with the host cell systems.
  • viruses such as polyoma virus, fowlpox virus, adenovirus (such as Adenovirus 2), bovine papilloma virus, avian sarcoma virus, cytomegalovirus, a retrovirus, hepatitis-B virus and most preferably Simian Virus 40 (
  • the early and late promoters of the SV40 virus are conveniently obtained as an SV40 restriction fragment that also contains the SV40 viral origin of replication.
  • the immediate early promoter of the human cytomegalovirus is conveniently obtained as a HindIII E restriction fragment.
  • a system for expressing DNA in mammalian hosts using the bovine papilloma virus as a vector is disclosed in U.S. Pat. No. 4,419,446. A modification of this system is described in U.S. Pat. No. 4,601,978. See also Reyes et al, Nature 297:598-601 (1982) on expression of human ⁇ -interferon cDNA in mouse cells under the control of a thymidine kinase promoter from herpes simplex virus. Alternatively, the rous sarcoma virus long terminal repeat can be used as the promoter.
  • Enhancer sequences are now known from mammalian genes (globin, elastase, albumin, ⁇ -fetoprotein, and insulin). Typically, however, one will use an enhancer from a eukaryotic cell virus. Examples include the SV40 enhancer on the late side of the replication origin (bp 100-270), the cytomegalovirus early promoter enhancer, the polyoma enhancer on the late side of the replication origin, and adenovirus enhancers.
  • the enhancer may be spliced into the vector at a position 5′ or 3′ to the polypeptide variant-encoding sequence, but is preferably located at a site 5′ from the promoter.
  • Expression vectors used in eukaryotic host cells will also contain sequences necessary for the termination of transcription and for stabilizing the mRNA. Such sequences are commonly available from the 5′ and, occasionally 3′, untranslated regions of eukaryotic or viral DNAs or cDNAs. These regions contain nucleotide segments transcribed as polyadenylated fragments in the untranslated portion of the mRNA encoding the polypeptide variant.
  • One useful transcription termination component is the bovine growth hormone polyadenylation region. See WO94/11026 and the expression vector disclosed therein.
  • Suitable host cells for cloning or expressing the DNA in the vectors herein are the prokaryote, yeast, or higher eukaryote cells described above.
  • Suitable prokaryotes for this purpose include eubacteria, such as Gram-negative or Gram-positive organisms, for example, Enterobacteriaceae such as Escherichia, e.g., E. coli, Enterobacter, Erwinia, Klebsiella, Proteus, Salmonella, e.g., Salmonella typhimurium, Serratia, e.g., Serratia marcescans, and Shigella, as well as Bacilli such as B. subtilis and B. licheniformis (e.g., B.
  • E. coli 294 ATCC 31,446
  • E. coli B E. coli X1776
  • E. coli W3110 ATCC 27,325
  • eukaryotic microbes such as filamentous fungi or yeast are suitable cloning or expression hosts for polypeptide variant-encoding vectors.
  • Saccharomyces cerevisiae or common baker's yeast, is the most commonly used among lower eukaryotic host microorganisms.
  • a number of other genera, species, and strains are commonly available and useful herein, such as Schizosaccharomyces pombe; Kluyveromyces hosts such as, e.g., K. lactis, K. fragilis (ATCC 12,424), K. bulgaricus (ATCC 16,045), K. wickeramii (ATCC 24,178), K.
  • waltii ATCC 56,500
  • K. drosophilarum ATCC 36,906
  • K. thermotolerans K. marxianus
  • yarrowia EP 402,226
  • Pichia pastoris EP 183,070
  • Candida Trichoderma reesia
  • Neurospora crassa Schwanniomyces such as Schwanniomyces occidentalis
  • filamentous fungi such as, e.g., Neurospora, Penicillium, Tolypocladium, and Aspergillus hosts such as A. nidulans and A. niger.
  • Suitable host cells for the expression of glycosylated polypeptide variant are derived from multicellular organisms.
  • invertebrate cells include plant and insect cells.
  • Numerous baculoviral strains and variants and corresponding permissive insect host cells from hosts such as Spodoptera frugiperda (caterpillar), Aedes aegypti (mosquito), Aedes albopictus (mosquito), Drosophila melanogaster (fruitfly), and Bombyx mori have been identified.
  • a variety of viral strains for transfection are publicly available, e.g., the L-1 variant of Autographa californica NPV and the Bm-5 strain of Bombyx mori NPV, and such viruses may be used as the virus herein according to the present invention, particularly for transfection of Spodoptera frugiperda cells.
  • Plant cell cultures of cotton, corn, potato, soybean, petunia, tomato, and tobacco can also be utilized as hosts.
  • vertebrate cells have been greatest in vertebrate cells, and propagation of vertebrate cells in culture (tissue culture) has become a routine procedure.
  • useful mammalian host cell lines are monkey kidney CV1 line transformed by SV40 (COS-7, ATCC CRL 1651); human embryonic kidney line (293 or 293 cells subcloned for growth in suspension culture, Graham et al., J. Gen Virol. 36:59 (1977)); baby hamster kidney cells (BHK, ATCC CCL 10); Chinese hamster ovary cells/-DHFR (CHO, Urlaub et al., Proc. Natl. Acad. Sci. USA 77:4216 (1980)); mouse sertoli cells (TM4, Mather, Biol. Reprod.
  • monkey kidney cells (CV1 ATCC CCL 70); African green monkey kidney cells (VERO-76, ATCC CRL-1 587); human cervical carcinoma cells (HELA, ATCC CCL 2); canine kidney cells (MDCK, ATCC CCL 34); buffalo rat liver cells (BRL 3A, ATCC CRL 1442); human lung cells (W138, ATCC CCL 75); human liver cells (Hep G2, HB 8065); mouse mammary tumor (MMT 060562, ATCC CCL51); TRI cells (Mather et al, Annals N.Y. Acad. Sci. 383:44-68 (1982)); MRC 5 cells; FS4 cells; and a human hepatoma line (Hep G2).
  • Host cells are transformed with the above-described expression or cloning vectors for polypeptide variant production and cultured in conventional nutrient media modified as appropriate for inducing promoters, selecting transformants, or amplifying the genes encoding the desired sequences.
  • the host cells used to produce the polypeptide variant of this invention may be cultured in a variety of media.
  • Commercially available media such as Ham's F10 (Sigma), Minimal Essential Medium ((MEM), (Sigma), RPMI-1640 (Sigma), and Dulbecco's Modified Eagle's Medium ((DMEM), Sigma) are suitable for culturing the host cells.
  • any of these media may be supplemented as necessary with hormones and/or other growth factors (such as insulin, transferrin, or epidermal growth factor), salts (such as sodium chloride, calcium, magnesium, and phosphate), buffers (such as HEPES), nucleotides (such as adenosine and thymidine), antibiotics (such as GENTAMYCINTM drug), trace elements (defined as inorganic compounds usually present at final concentrations in the micromolar range), and glucose or an equivalent energy source. Any other necessary supplements may also be included at appropriate concentrations that would be known to those skilled in the art.
  • the culture conditions such as temperature, pH, and the like, are those previously used with the host cell selected for expression, and will be apparent to the ordinarily skilled artisan.
  • the polypeptide variant can be produced intracellularly, in the periplasmic space, or directly secreted into the medium. If the polypeptide variant is produced intracellularly, as a first step, the particulate debris, either host cells or lysed fragments, is removed, for example, by centrifugation or ultrafiltration. Carter et al., Bio/Technology 10:163-167 (1992) describe a procedure for isolating antibodies which are secreted to the periplasmic space of E. coli. Briefly, cell paste is thawed in the presence of sodium acetate (pH 3.5), EDTA, and phenylmethylsulfonylfluoride (PMSF) over about 30 min.
  • sodium acetate pH 3.5
  • EDTA EDTA
  • PMSF phenylmethylsulfonylfluoride
  • Cell debris can be removed bycentrifugation.
  • supernatants from such expression systems are generally first concentrated using a commercially available protein concentration filter, for example, an Amicon or Millipore Pellicon ultrafiltration unit.
  • a protease inhibitor such as PMSF may be included in any of the foregoing steps to inhibit proteolysis and antibiotics may be included to prevent the growth of adventitious contaminants.
  • the polypeptide variant composition prepared from the cells can be purified using, for example, hydroxylapatite chromatography, gel electrophoresis, dialysis, and affinity chromatography, with affinity chromatography being the preferred purification technique.
  • affinity chromatography is the preferred purification technique.
  • the suitability of protein A as an affinity ligand depends on the species and isotype of any immunoglobulin Fc region that is present in the polypeptide variant.
  • Protein A can be used to purify polypeptide variants that are based on human ⁇ 1, ⁇ 2, or ⁇ 4 heavy chains (Lindmark et al., J. Immunol. Meth. 62:1-13 (1983)). Protein G is recommended for all mouse isotypes and for human Y (Guss et al., EMBO J.
  • the matrix to which the affinity ligand is attached is most often agarose, but other matrices are available. Mechanically stable matrices such as controlled pore glass or poly(styrenedivinyl)benzene allow for faster flow rates and shorter processing times than can be achieved with agarose. Where the polypeptide variant comprises a C H 3 domain, the Bakerbond ABXTM resin (J. T. Baker, Phillipsburg, N.J.) is useful for purification.
  • the mixture comprising the polypeptide variant of interest and contaminants may be subjected to low pH hydrophobic interaction chromatography using an elution buffer at a pH between about 2.5-4.5, preferably performed at low salt concentrations (e.g.,from about 0-0.25M salt).
  • Therapeutic formulations of the polypeptide variant are prepared for storage by mixing the polypeptide variant having the desired degree of purity with optional physiologically acceptable carriers, excipients or stabilizers ( Remington's Pharmaceutical Sciences 16th edition, Osol, A. Ed. (1980)), in the form of lyophilized formulations or aqueous solutions.
  • Acceptable carriers, excipients, or stabilizers are nontoxic to recipients at the dosages and concentrations employed, and include buffers such as phosphate, citrate, and other organic acids; antioxidants including ascorbic acid and methionine; preservatives (such as octadecyldimethylbenzyl ammonium chloride; hexamethonium chloride; benzalkonium chloride, benzethonium chloride; phenol, butyl or benzyl alcohol; alkyl parabens such as methyl or propyl paraben; catechol; resorcinol; cyclohexanol; 3-pentanol; and m-cresol); low molecular weight (less than about 10 residues) polypeptide; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidone; amino acids such as glycine, glutamine, asparagine, histidine, arg
  • the formulation herein may also contain more than one active compound as necessary for the particular indication being treated, preferably those with complementary activities that do not adversely affect each other.
  • Such molecules are suitably present in combination in amounts that are effective for the purpose intended.
  • the active ingredients may also be entrapped in microcapsule prepared, for example, by coacervation techniques or by interfacial polymerization, for example, hydroxymethylcellulose or gelatin-microcapsule and poly-(methylmethacylate) microcapsule, respectively, in colloidal drug delivery systems (for example, liposomes, albumin microspheres, microemulsions, nano-particles and nanocapsules) or in macroemulsions.
  • colloidal drug delivery systems for example, liposomes, albumin microspheres, microemulsions, nano-particles and nanocapsules
  • the formulations to be used for in vivo administration must be sterile. This is readily accomplished by filtration through sterile filtration membranes.
  • Sustained-release preparations may be prepared. Suitable examples of sustained-release preparations include semipermeable matrices of solid hydrophobic polymers containing the polypeptide variant, which matrices are in the form of shaped articles, e.g., films, or microcapsule. Examples of sustained-release matrices include polyesters, hydrogels (for example, poly(2-hydroxyethyl-methacrylate), or poly(vinylalcohol)), polylactides (U.S. Pat. No.
  • copolymers of L-glutamic acid and y ethyl-L-glutamate non-degradable ethylene-vinyl acetate
  • degradable lactic acid-glycolic acid copolymers such as the LUPRON DEPOTTM (injectable microspheres composed of lactic acid-glycolic acid copolymer and leuprolide acetate)
  • poly-D-( ⁇ )-3-hydroxybutyric acid While polymers such as ethylene-vinyl acetate and lactic acid-glycolic acid enable release of molecules for over 100 days, certain hydrogels release proteins for shorter time periods.
  • encapsulated antibodies When encapsulated antibodies remain in the body for a long time, they may denature or aggregate as a result of exposure to moisture at 37° C., resulting in a loss of biological activity and possible changes in immunogenicity. Rational strategies can be devised for stabilization depending on the mechanism involved. For example, if the aggregation mechanism is discovered to be intermolecular S—S bond formation through thio-disulfide interchange, stabilization may be achieved by modifying sulfhydryl residues, lyophilizing from acidic solutions, controlling moisture content, using appropriate additives, and developing specific polymer matrix compositions.
  • the polypeptide variant of the invention may be used as an affinity purification agent.
  • the polypeptide variant is immobilized on a solid phase such a Sephadex resin or filter paper, using methods well known in the art.
  • the immobilized polypeptide variant is contacted with a sample containing the antigen to be purified, and thereafter the support is washed with a suitable solvent that will remove substantially all the material in the sample except the antigen to be purified, which is bound to the immobilized polypeptide variant. Finally, the support is washed with another suitable solvent, such as glycine buffer, pH 5.0, that will release the antigen from the polypeptide variant.
  • the polypeptide variant may also be useful in diagnostic assays, e.g., for detecting expression of an antigen of interest in specific cells, tissues, or serum.
  • polypeptide variant typically will be labeled with a detectable moiety.
  • labels are available which can be generally grouped into the following categories:
  • Radioisotopes such as 35 S, 14 C, 125 I, 3 H, and 131 I.
  • the polypeptide variant can be labeled with the radioisotope using the techniques described in Current Protocols in Immunology, Volumes 1 and 2, Coligen et al., Ed. Wiley-lnterscience, New York, New York, Pubs. (1991) for example and radioactivity can be measured using scintillation counting.
  • Fluorescent labels such as rare earth chelates (europium chelates) or fluorescein and its derivatives, rhodamine and its derivatives, dansyl, Lissamine, phycoerythrin and Texas Red are available.
  • the fluorescent labels can be conjugated to the polypeptide variant using the techniques disclosed in Current Protocols in Immunology, supra, for example. Fluorescence can be quantified using a fluorimeter.
  • the enzyme generally catalyzes a chemical alteration of the chromogenic substrate that can be measured using various techniques. For example, the enzyme may catalyze a color change in a substrate, which can be measured spectrophotometrically. Alternatively, the enzyme may alter the fluorescence or chemiluminescence of the substrate. Techniques for quantifying a change in fluorescence are described above.
  • the chemiluminescent substrate becomes electronically excited by a chemical reaction and may then emit light which can be measured (using a chemiluminometer, for example) or donates energy to a fluorescent acceptor.
  • enzymatic labels include luciferases (e.g., firefly luciferase and bacterial luciferase; U.S. Pat. No. 4,737,456), luciferin, 2,3-dihydrophthalazinediones, malate dehydrogenase, urease, peroxidase such as horseradish peroxidase (HRPO), alkaline phosphatase, ⁇ -galactosidase, glucoamylase, lysozyme, saccharide oxidases (e.g., glucose oxidase, galactose oxidase, and glucose-6-phosphate dehydrogenase), heterocyclic oxidases (such as uricase and xanthine oxidase), lactoperoxidase, microperoxidase, and the like.
  • luciferases e.g., firefly luciferase and bacterial lucifera
  • enzyme-substrate combinations include, for example:
  • HRPO Horseradish peroxidase
  • OPD orthophenylene diamine
  • TMB 3,3′,5,5′-tetramethyl benzidine hydrochloride
  • ⁇ -D-galactosidase ( ⁇ -D-Gal) with a chromogenic substrate (e.g., p-nitrophenyl- ⁇ -D-galactosidase) or fluorogenic substrate 4-methylumbelliferyl- ⁇ -D-galactosidase.
  • a chromogenic substrate e.g., p-nitrophenyl- ⁇ -D-galactosidase
  • fluorogenic substrate 4-methylumbelliferyl- ⁇ -D-galactosidase
  • the label is indirectly conjugated with the polypeptide variant.
  • the polypeptide variant can be conjugated with biotin and any of the three broad categories of labels mentioned above can be conjugated with avidin, or vice versa. Biotin binds selectively to avidin and thus, the label can be conjugated with the polypeptide variant in this indirect manner.
  • the polypeptide variant is conjugated with a small hapten (e.g., digoxin) and one of the different types of labels mentioned above is conjugated with an anti-hapten polypeptide variant (e.g., anti-digoxin antibody).
  • a small hapten e.g., digoxin
  • an anti-hapten polypeptide variant e.g., anti-digoxin antibody
  • the polypeptide variant need not be labeled, and the presence thereof can be detected using a labeled antibody which binds to the polypeptide variant.
  • polypeptide variant of the present invention may be employed in any known assay method, such as competitive binding assays, direct and indirect sandwich assays, and immunoprecipitation assays. Zola, Monoclonal Antibodies: A Manual of Techniques, pp.147-158 (CRC Press, Inc. 1987).
  • the polypeptide variant may also be used for in vivo diagnostic assays.
  • the polypeptide variant is labeled with a radionuclide (such as 111 In, 99 Tc, 14 C, 131 I, 125 I, 3 H, 32 P or 35 S) so that the antigen or cells expressing it can be localized using immunoscintiography.
  • a radionuclide such as 111 In, 99 Tc, 14 C, 131 I, 125 I, 3 H, 32 P or 35 S
  • the polypeptide variant of the present invention may be used to treat a mammal e.g. a patient suffering from, or predisposed to, a disease or disorder who could benefit from administration of the polypeptide variant.
  • the conditions which can be treated with the polypeptide variant are many and include cancer (e.g. where the polypeptide variant binds the HER2 receptor, CD20 or vascular endothelial growth factor (VEGF)); allergic conditions such as asthma (with an anti-IgE antibody); and LFA-1-mediated disorders (e.g. where the polypeptide variant is an anti-LFA-1 or anti-ICAM-1 antibody) etc.
  • cancer e.g. where the polypeptide variant binds the HER2 receptor, CD20 or vascular endothelial growth factor (VEGF)
  • allergic conditions such as asthma (with an anti-IgE antibody)
  • LFA-1-mediated disorders e.g. where the polypeptide variant is an anti-LFA-1 or anti-ICAM-1 antibody
  • the disorder preferably is HER2-expressing cancer, e.g. a benign or malignant tumor characterized by overexpression of the HER2 receptor.
  • cancers include, but are not limited to, breast cancer, squamous cell cancer, small-cell lung cancer, non-small cell lung cancer, gastrointestinal cancer, pancreatic cancer, glioblastoma, cervical cancer, ovarian cancer, bladder cancer, hepatoma, colon cancer, colorectal cancer, endometrial carcinoma, salivary gland carcinoma, kidney cancer, liver cancer, prostate cancer, vulval cancer, thyroid cancer, hepatic carcinoma and various types of head and neck cancer.
  • the polypeptide variant with improved ADCC activity may be employed in the treatment of diseases or disorders where destruction or elimination of tissue or foreign micro-organisms is desired.
  • the polypeptide may be used to treat cancer; inflammatory disorders; infections (e.g. bacterial, viral, fungal or yeast infections); and other conditions (such as goiter) where removal of tissue is desired, etc.
  • the polypeptide variant may be used to treat diseases or disorders where a Fc region-containing polypeptide with long half-life is desired, but the polypeptide preferably does not have undesirable effector function(s).
  • the Fc region-containing polypeptide may be an anti-tissue factor (TF) antibody; anti-IgE antibody; and anti-integrin antibody (e.g. an anti- ⁇ 4 ⁇ 7 antibody).
  • TF tissue factor
  • anti-IgE antibody anti-integrin antibody
  • the desired mechanism of action of such Fc region-containing polypeptides may be to block ligand-receptor binding pairs.
  • the Fc-region containing polypeptide with diminished ADCC activity may be an agonist antibody.
  • the polypeptide variant is administered by any suitable means, including parenteral, subcutaneous, intraperitoneal, intrapulmonary, and intranasal, and, if desired for local immunosuppressive treatment, intralesional administration.
  • Parenteral infusions include intramuscular, intravenous, intraarterial, intraperitoneal, or subcutaneous administration.
  • the polypeptide variant is suitably administered by pulse infusion, particularly with declining doses of the polypeptide variant.
  • the dosing is given by injections, most preferably intravenous or subcutaneous injections, depending in part on whether the administration is brief or chronic.
  • polypeptide variant For the prevention or treatment of disease, the appropriate dosage of polypeptide variant will depend on the type of disease to be treated, the severity and course of the disease, whether the polypeptide variant is administered for preventive or therapeutic purposes, previous therapy, the patient's clinical history and response to the polypeptide variant, and the discretion of the attending physician.
  • the polypeptide variant is suitably administered to the patient at one time or over a series of treatments.
  • polypeptide variant is an initial candidate dosage for administration to the patient, whether, for example, by one or more separate administrations, or by continuous infusion.
  • a typical daily dosage might range from about 1 ⁇ g/kg to 100 mg/kg or more, depending on the factors mentioned above.
  • the treatment is sustained until a desired suppression of disease symptoms occurs.
  • other dosage regimens may be useful. The progress of this therapy is easily monitored by conventional techniques and assays.
  • the polypeptide variant composition will be formulated, dosed, and administered in a fashion consistent with good medical practice. Factors for consideration in this context include the particular disorder being treated, the particular mammal being treated, the clinical condition of the individual patient, the cause of the disorder, the site of delivery of the agent, the method of administration, the scheduling of administration, and other factors known to medical practitioners.
  • the “therapeutically effective amount” of the polypeptide variant to be administered will be governed by such considerations, and is the minimum amount necessary to prevent, ameliorate, or treat a disease or disorder.
  • the polypeptide variant need not be, but is optionally formulated with one or more agents currently used to prevent or treat the disorder in question.
  • the effective amount of such other agents depends on the amount of polypeptide variant present in the formulation, the type of disorder or treatment, and other factors discussed above. These are generally used in the same dosages and with administration routes as used hereinbefore or about from 1 to 99% of the heretofore employed dosages.
  • This assay determines binding of an IgG Fc region to recombinant Fc ⁇ RIIA, Fc ⁇ RIlB and Fc ⁇ RIIIA a subunits expressed as His6-glutathione S transferase (GST)-tagged fusion proteins. Since the affinity of the Fc region of IgG1 for the Fc ⁇ RI is in the nanomolar range, the binding of IgG1 Fc variants can be measured by titrating monomeric IgG and measuring bound IgG with a polyclonal anti-IgG in a standard ELISA format (Example 2 below). The affinity of the other members of the Fc ⁇ R family, i.e. Fc ⁇ RIIA, Fc ⁇ RIlB and Fc ⁇ RIIIA for IgG is however in the micromolar range and binding of monomeric IgG1 for these receptors can not be reliably measured in an ELISA format.
  • the following assay utilizes Fc variants of recombinant anti-IgE E27 ( FIGS. 4A and 4B ) which, when mixed with human IgE at a 1:1 molar ratio, forms a stable hexamer consisting of three anti-IgE molecules and three IgE molecules.
  • a recombinant chimeric form of IgE (chimeric IgE) was engineered and consists of a human IgE Fc region and the Fab of an anti-VEGF antibody (Presta et al. Cancer Research 57:4593-4599 (1997)) which binds two VEGF molecules per mole of anti-VEGF.
  • Receptor Coat Fc ⁇ receptor a subunits were expressed as GST fusions of His6 tagged extracellular domains (ECDs) in 293 cells resulting in an ECD-6His-GST fusion protein (Graham et al. J. Gen. Virol. 36:59-74 (1977) and Gorman et al. DNA Prot. Eng. Tech. 2:3-10 (1990)) and purified by Ni-NTA column chromatography (Qiagen, Australia) and buffer exchanged into phosphate buffered saline (PBS). Concentrations were determined by absorption at 280 nm using extinction coefficients derived by amino acid composition analysis. Receptors were coated onto Nunc F96 maxisorb plates (cat no.
  • E27:chimeric IgE:VEGF: (1:1:2 molar ratio) complexes are added to Fc ⁇ R a subunit coated plates at E27 concentrations of 5 ⁇ g and 1 ⁇ g total IgG in quadruplicate in assay buffer and incubated for 120 minutes at 25° C. on an orbital shaker.
  • HRP horse radish peroxidase conjugated goat anti-human IgG
  • y horse radish peroxidase
  • Plates are washed 5 ⁇ with wash buffer to remove unbound HRP goat anti-human IgG and bound anti-IgG is detected by adding 100 ⁇ l of substrate solution (0.4 mg/ml o-phenylenedaimine dihydrochloride, Sigma P6912, 6 mM H 2 O 2 in PBS) and incubating for 8 min at 25° C. Enzymatic reaction is stopped by the addition of 100 ⁇ l 4.5N H 2 SO 4 and colorimetric product is measured at 490 nm on a 96 well plate densitometer (Molecular Devices). Binding of E27 variant complexes is expressed as a percent of the wild type E27 containing complex.
  • C2B8 Variants The chimeric light and heavy chains of anti-CD20 antibody C2B8 (Reff et al., Blood 83:435 (1994)) subcloned separately into previously described PRK vectors (Gorman et al., DNA Protein Eng. Tech. 2:3 (1990)) were used. By site directed mutagenesis (Kunkel et al., Proc. Natl. Acad.Sci.USA 82:488 (1985)), alanine scan variants of the Fc region in the heavy chain were constructed. The heavy and light chain plasmids were co-transfected into an adenovirus transformed human embryonic kidney cell line as previously described (Werther et al., J.
  • the media was changed to serum-free 24 hours after transfection and the secreted antibody was harvested after five days.
  • the antibodies were purified using Protein A-SEPHAROSE CL-4BTM (Pharmacia), buffer exchanged and concentrated to 0.5 ml with PBS using a Centricon-30 (Amicon), and stored at 4° C. The concentration of the antibody was determined using total Ig-binding ELISA.
  • C1q Binding ELISA Costar 96 well plates were coated overnight at 4° C. with the indicated concentrations of C2B8 in coating buffer (0.05 M sodium carbonate buffer), pH 9. The plates were then washed 3 ⁇ with PBS/0.05% TWEEN 20TM, pH 7.4 and blocked with 200 ⁇ l of ELISA diluent without thimerosal (0.1 M NaPO4/0.1 M NaCl/0.1% gelatin /0.05% TWEEN 20TM/0.05% ProClin300) for 1 hr at room temperature.
  • the plate was washed 3x with wash buffer, an aliquot of 100 ⁇ l of 2 ⁇ g/ml C1q (Quidel, San Diego, Calif.) was added to each well and incubated for 2 hrs at room temperature. The plate was then washed 6 ⁇ with wash buffer. 100 ⁇ l of a 1:1000 dilution of sheep anti-complement C1q peroxidase conjugated antibody (Biodesign) was added to each well and incubated for 1 hour at room temperature. The plate was again washed 6 ⁇ with wash buffer and 100 ⁇ l of substrate buffer (PBS/0.012% H 2 O 2 ) containing OPD (O-phenylenediamine dihydrochloride (Sigma)) was added to each well.
  • substrate buffer PBS/0.012% H 2 O 2
  • OPD O-phenylenediamine dihydrochloride
  • the oxidation reaction observed by the appearance of a yellow color, was allowed to proceed for 30 minutes and stopped by the addition of 100 ⁇ l of 4.5 N H 2 SO 4 .
  • the absorbance was then read at (492-405) nm using a microplate reader (SPECTRA MAX 250TM, Molecular Devices Corp.).
  • the appropriate controls were run in parallel (i.e. the ELISA was performed without C1q for each concentration of C2B8 used and also the ELISA was performed without C2B8).
  • C1q binding was measured by plotting the absorbance (492-405) nm versus concentration of C2B8 in ⁇ g/ml using a 4-parameter curve filting program (KALEIDAGRAPHTM) and comparing EC 50 values.
  • CDC Complement Dependent Cytotoxicity
  • Human complement (Quidel) was diluted 1:3 in RHB buffer and WIL2-S cells (available from the ATCC, Manassas, Va.) which express the CD20 antigen were diluted to a density of 1 ⁇ 10 6 cells/ml with RHB buffer.
  • Mixtures of 150 ⁇ l containing equal volumes of C2B8, diluted human complement and WIL2-S cells were added to a flat bottom tissue culture 96 well plate and allowed to incubate for 2 hrs at 37° C. and 5% CO 2 to facilitate complement mediated cell lysis. 50 ⁇ l of alamar blue (Accumed International) was then added to each well and incubated overnight at 37° C.
  • the absorbance was measured using a 96-well fluorometer with excitation at 530 nm and emission at 590 nm. As described by Gazzano-Santoro et al., the results are expressed in relative fluorescence units (RFU). The sample concentrations were computed from a C2B8 standard curve and the percent activity as compared to wild type C2B8 is reported for each variant.
  • CD20 Binding Potency of the C2B8 Variants The binding of C2B8 and variants to the CD20 antigen were assessed by a method previously described (Reff et al., (1994), supra; reviewed in Gazzano-Santoro et al., (1997), supra). WIL2-S cells were grown for 3-4 days to a cell density of 1 ⁇ 10 6 cells/ml. The cells were washed and spun twice in FACS buffer (PBS/0.1% BSA/0.02% NaN 3 ) and resuspended to a cell density of 5 ⁇ 10 6 cells/ml.
  • FACS buffer PBS/0.1% BSA/0.02% NaN 3
  • Fc ⁇ R Binding ELISAs Fc ⁇ RI ⁇ subunit-GST fusion was coated onto Nunc F96 maxisorb plates (cat no.439454) by adding 100 ⁇ l of receptor-GST fusion at 1 ⁇ g/ml in PBS and incubated for 48 hours at 4° C. Prior to assay, plates are washed 3 ⁇ with 250 [l of wash buffer (PBS pH 7.4 containing 0.5% TWEEN 20TM) and blocked with 250 ⁇ l of assay buffer (50 mM Tris buffered saline, 0.05% TWEEN 20TM, 0.5% RIA grade bovine albumin (Sigma A7888), and 2 mM EDTA pH 7.4).
  • wash buffer PBS pH 7.4 containing 0.5% TWEEN 20TM
  • assay buffer 50 mM Tris buffered saline, 0.05% TWEEN 20TM, 0.5% RIA grade bovine albumin (Sigma A7888), and 2 mM EDTA pH 7.4
  • Plates are washed 5 ⁇ with wash buffer to remove unbound HRP goat anti-human IgG and bound anti-IgG is detected by adding 100 ⁇ l of substrate solution (0.4 mg/ml o-phenylenedaimine dihydrochloride, Sigma P6912, 6 mM H 2 O 2 in PBS) and incubating for 8 min at 25° C. Enzymatic reaction is stopped by the addition of 100 ⁇ l 4.5N H 2 SO 4 and colorimetric product is measured at 490 nm on a 96 well plate densitometer (Molecular Devices). Binding of variant is expressed as a percent of the wild type molecule.
  • Fc ⁇ RII and III binding ELISAs were performed as described in Example 1 above.
  • ELISA plates were coated with 2 ⁇ g/ml streptavidin (Zymed, South San Francisco) in 50 mM carbonate buffer, pH 9.6, at 4° C. overnight and blocked with PBS-0.5% BSA, pH 7.2 at room temperature for one hour.
  • Biotinylated FcRn prepared using biotin-X-NHS from Research Organics, Cleveland, Ohio and used at 1-2 ⁇ g/ml
  • PBS-0.5% BSA 0.05% polysorbate 20, pH 7.2
  • the IgG2 variant appears to have a much lower affinity for C1q than the E318A and K320A variants ( FIG. 2 ).
  • the results demonstrate that E318 and K320 do not constitute the core C1q binding sites for human IgG1.
  • the K322A substitution had a significant effect on both complement activity and C1q binding.
  • the K322A variant did not have CDC activity when tested in the above CDC assay and was more than a 100 fold lower than wild type C2B8 in binding to C1q ( FIG. 2 ).
  • K322 is the only residue of the proposed core C1q binding sites that appeared to have a significant effect on complement activation and C1q binding.
  • Variants constructed, K274A, N276A, Y278A, S324A, P329A, P331A, K334A, and T335A were assessed for their ability to bind C1q and also to activate complement. Many of these substitutions had little or no effect on C1q binding or complement activation.
  • the P329A and the P331A variants did not activate complement and had decreased binding to C1q.
  • the mutation P329A results in an antibody that does not activate complement and is more than a 100 fold lower in binding to C1q ( FIG. 3 ) when compared to wild type C2B8 ( FIG. 2 ).
  • Variants that did not bind to C1q and hence did not activate complement were examined for their ability to bind to the Fc receptors: Fc ⁇ RI, Fc ⁇ RIIA, Fc ⁇ RIIB, Fc ⁇ RIIIA and FcRn.
  • This particular study was performed using a humanized anti-IgE antibody, an IgG1 antibody with these mutations (see Example 1 above).
  • a further residue involved in binding human C1q was identified using the methods described in the present example.
  • the residue D270 was replaced with lysine and valine to generate variants D270K and D270V, respectively. These variants both showed decreased binding to human C1q ( FIG. 6 ) and were non-lytic ( FIG. 7 ).
  • the two variants bound the CD20 antigen normally and recruited ADCC.
  • K326, A327, E333 and K334 are potential sites for improving the efficacy of antibodies by way of the CDC pathway.
  • the aim of this study was to improve CDC activity of an antibody by increasing binding to C1q.
  • K326M, K326D, K326E and E333S were constructed with at least a two-fold increase in binding to C1q when compared to wild type.
  • Variant K326W displayed about a five-fold increase in binding to C1q.
  • Variants of the wild type C2B8 antibody were prepared as described above in Example 2.
  • the C1q binding ELISA, CDC assay, and CD20 binding potency assay in this example were performed as described in Example 2 above.
  • K326A, K326D, K326E, K326G, K326V, K326M and K326W were all bound to C1q with a better affinity than the wild type antibody.
  • K326W, K326M, K326D and K326E showed at least a two-fold increase in binding to C1q (Table 5).
  • K326W had the best affinity for C1q.
  • E333 was also substituted with other amino acid residues.
  • E333S, E333G, E333V, E333D, and E333Q all had increased binding to C1q when compared to the wild type ( FIG. 11 ).
  • the order of binding affinity for C1q was as follows: E333S>E333A>E333G>E333V>E333D>E333Q.
  • Substitutions with amino acid residues with small side chain volumes, i.e. serine, alanine and glycine resulted in variants with higher affinity for C1q in comparison to the other variants, E333V, E333D and E333Q, with larger side chain volumes.
  • the variant E333S had the highest affinity for C1q, showing a two-fold increase in binding when compared to the wild type. Without being bound to anyone theory, this indicates the effect on C1q binding at 333 may also be due in part to the polarity of the residue.
  • Double variants were also generated. As shown in FIGS. 12 and 13 , double variants K326M-E333S and K326A-E333A were at least three-fold better at binding human C1q than wild type C2B8 ( FIG. 12 ) and at least two-fold better at mediating CDC compared to wild type C2B8 ( FIG. 13 ). Additivity indicates these are independently acting variants.
  • IgG1 Variants Recombinant anti-IgE E27 having the light chain and heavy chain sequences in FIGS. 4A and 4B , respectively, was used as the parent antibody in the following experiments. This antibody binds the antigen IgE and has a non-A allotype IgG1 Fc region. By site directed mutagenesis (Kunkel et al., Proc. Natl. Acad.Sci.USA 82:488 (1985)), variants of the Fc region in the heavy chain of the above parent antibody were constructed. The heavy and light chain plasmids were co-transfected into an adenovirus transformed human embryonic kidney cell line as previously described (Werther et al, J. Immunol.
  • the media was changed to serum-free 24 hours after transfection and the secreted antibody was harvested after five days.
  • the antibodies were purified by Protein G SEPHAROSE® (Pharmacia), buffer exchanged and concentrated to 0.5 ml with PBS using a Centricon-30 (Amicon), and stored at 4° C. Concentration was determined by adsorption at 280 nm using extinction coefficients derived by amino acid composition analysis.
  • Fc ⁇ RIA was expressed as a GST fusion of His6 tagged extracellular domain in 293 cells and purified by Ni-NTA column chromatography.
  • Purified receptors were coated onto Nunc F96 maxisorb plates (cat no. 439545) at approximately 150 ng per well by adding 100 ⁇ L of receptor at 1.5 ⁇ g/mL in PBS and incubated for 24 hours at 4° C. Prior to assay, plates were washed 3 ⁇ with 250 ⁇ L of wash buffer (phosphate buffered saline pH 7.4 containing 0.5% TWEEN 20®) and blocked with 250 ⁇ L of assay buffer (50 mM tris buffered saline, 0.05% TWEEN 20®, 0.5% RIA grade bovine albumin (Sigma A7888), and 2 mM EDTA pH 7.4).
  • wash buffer phosphate buffered saline pH 7.4 containing 0.5% TWEEN 20®
  • assay buffer 50 mM tris buffered saline, 0.05% TWEEN 20®, 0.5% RIA grade bovine albumin (Sigma A7888), and 2 mM EDTA pH 7.4
  • E27 100 ⁇ L of E27 was added to the first four wells of the Fc ⁇ RIA subunit coated plated at a concentration of 10 ⁇ g/mL. 80 ⁇ L of assay buffer was added to the next four well followed by 20 ⁇ L of the 10 ⁇ g/mL E27 ⁇ gG to give a final concentration of 2 ⁇ g/mL. Plates were incubated at 25° C. for 2 hours on an orbital shaker.
  • HRP horse radish peroxidase conjugated protein G
  • BIORAD horse radish peroxidase conjugated protein G
  • HRP conjugates were incubated for 1.5 hours at 25° C. on an orbital shaker. Plates were washed ⁇ 5 with wash buffer to remove unbound HRP conjugate. Binding was detected by adding 100-L of substrate solution (0.4 mg/mL o-phenylenedaimine dihydrochloride, Sigma P6912, 6 mM H 2 O 2 in PBS) and incubating for 10 minutes at 25° C. Enzymatic reaction was stopped by the addition of 100 ⁇ L of 4.5 N H 2 SO 4 and colorimetric product was measured at 490 nm on a 96 well plate densitometer (Molecular Devices).
  • Binding of E27 variants at IgG concentration of 2 ⁇ g/mL was expressed as a ratio of wild type E27.
  • IgG binding Fc ⁇ RIA was detected by adding 100 ⁇ L FITC conjugated F(ab′) 2 fragment of goat anti-human IgG heavy chain specific. (Jackson lmmunoresearch) at 1:200. FITC conjugates were incubated with cells for 30 minutes on ice. Cells were washed ⁇ 3 with assay buffer to remove unbound FITC conjugate. Cells were stained with P.I. (SIGMA) at 2.5 ⁇ g/mL and analyzed by flow cytometry.
  • SIGMA P.I.
  • Binding of E27 variants at IgG concentration of 1.5 pg/mL was expressed as a ratio of wild type E27.
  • Fc ⁇ RIIA, Fc ⁇ RIIB and Fc ⁇ RIIIA binding ELISAs were performed as described in Example 1 above, with detection of the stable hexamer (consisting of three anti-IgE molecules and three IgE molecules).
  • FcRn Binding ELISA For measuring FcRn binding activity of IgG variants, ELISA plates were coated with 2 ⁇ g/ml streptavidin (Zymed, South San Francisco) in 50 mM carbonate buffer, pH 9.6, at 4° C. overnight and blocked with PBS-0.5% BSA, pH 7.2 at room temperature for one hour. Biotinylated FcRn (prepared using biotin-X-NHS from Research Organics, Cleveland, Ohio and used at 1-2 ⁇ g/ml) in PBS-0.5% BSA, 0.05% polysorbate 20, pH 7.2, was added to the plate and incubated for one hour.
  • IgG standard 1.6-100 ng/ml
  • PBS-0.5% BSA, 0.05% polysorbate 20, pH 6.0 Two fold serial dilutions of IgG standard (1.6-100 ng/ml) or variants in PBS-0.5% BSA, 0.05% polysorbate 20, pH 6.0, were added to the plate and incubated for two hours. Bound IgG was detected using peroxidase labeled goat F(ab′) 2 anti-human IgG F(ab′) 2 in the above pH 6.0 buffer (Jackson lmmunoResearch, West Grove, Pa.) followed by 3,3′,5,5′-tetramethyl benzidine (Kirgaard & Perry Laboratories) as the substrate. Plates were washed between steps with PBS-0.05% TWEEN 20® at either pH 7.2 or 6.0.
  • chromium 51-labeled target cells tumor cell lines were grown in tissue culture plates and harvested using sterile 10 mM EDTA in PBS. SK-BR-3 cells, a 3+HER2-overexpressing human breast cancer cell line, were used as targets in all assays. The detached cells were washed twice with cell culture medium. Cells (5 ⁇ 10 6 ) were labeled with 200 ⁇ Ci of chromium51 (New England Nuclear/DuPont) at 37° C. for one hour with occasional mixing. Labeled cells were washed three times with cell culture medium, then were resuspended to a concentration of 1 ⁇ 10 5 cells/mL.
  • Cells were used either without opsonization, or were opsonized prior to the assay by incubation with rhuMAb HER2 wildtype (HERCEPTIN®) or seven Fc mutants (G14, G18, G17, G36, G30, G31 and G34) at 100 ng/mL and 1.25 ng/mL in PBMC assay or 20 ng/mL and 1 ng/mL in NK assay.
  • rhuMAb HER2 wildtype HERCEPTIN®
  • Fc mutants G14, G18, G17, G36, G30, G31 and G34
  • Peripheral blood mononuclear cells were prepared by collecting blood on heparin from normal healthy donors and dilution with an equal volume of phosphate buffered saline (PBS). The blood was then layered over LYMPHOCYTE SEPARATION MEDIUM® (LSM: Organon Teknika) and centrifuged according to the manufacturer's instructions. Mononuclear cells were collected from the LSM-plasma interface and were washed three times with PBS. Effector cells were suspended in cell culture medium to a final concentration of 1 ⁇ 10 7 cells/mL.
  • PBS phosphate buffered saline
  • NK cells natural killer cells were isolated from PBMCs by negative selection using an NK cell isolation kit and a magnetic column (Miltenyi Biotech) according to the manufacturer's instructions. Isolated NK cells were collected, washed and resuspended in cell culture medium to a concentration of 2 ⁇ 10 6 cells/mL. The identity of the NK cells was confirmed by flow cytometric analysis.
  • Varying effector:target ratios were prepared by serially diluting the effector (either PBMC or NK) cells two-fold along the rows of a microtiter plate (100 ⁇ L final volume) in cell culture medium.
  • the concentration of effector cells ranged from 1.0 ⁇ 10 7 /mL to 2.0 ⁇ 10 4 /mL for PBMC and from 2.0 ⁇ 10 6 /mL to 3.9 ⁇ 10 3 /mL for NK.
  • 100 ⁇ L of chromium 51-labeled target cells (opsonized or nonoponsonized) at 1 ⁇ 10 5 cells/mL were added to each well of the plate.
  • a variety of antibody variants were generated which had FcR binding activity that differed from the parent antibody.
  • the FcR binding data for the variants generated is shown in Tables 6 and 7 below.
  • Variants with increased binding to FcRn generally had binding values ⁇ 1.30 as determined in this Example and those with reduced binding to FcRn generally had binding values ⁇ 0.70 as determined in this Example.
  • various non-alanine substitution variants were made, and the FcR binding activity of those variants is summarized in the following table.
  • This study includes a complete mapping of human IgG1 for human Fc ⁇ RI, Fc ⁇ RIIA, Fc ⁇ RIlB, Fc ⁇ RIIIA, and FcRn.
  • Fc ⁇ RI and FcRn are high affinity receptors and monomeric IgG could be evaluated in the assays for these two receptors.
  • Fc ⁇ RIIA, Fc ⁇ RIIB and Fc ⁇ RIIIA are low affinity receptors and required use of an immune complex.
  • an ELISA-type assay was used for Fc ⁇ RIIA, Fc ⁇ RIIB, and Fc ⁇ RIIIA, in which pre-formed hexamers, consisting of three anti-IgE E27 and three IgE molecules were bound to the Fc ⁇ R and either anti-human IgG Fc-HRP or protein G-HRP used as detection reagent.
  • these hexamers could be linked into multimers by addition of human VEGF (using anti-VEGF IgE).
  • the hexameric complexes were used since these provided sufficient binding and required less IgG. Complexes formed using other antibody:antigen combinations are also possible reagents, as long as the antigen contains at least two identical binding sites per molecule for the antibody.
  • VEGF contains two binding sites per VEGF dimer for anti-VEGF A.4.6.1 (Kim et al., Growth Factors 7:53 (1992) and Kim et al. Nature 362:841 (1993)). VEGF:anti-VEGF multimers also bound to the low affinity Fc ⁇ RIIA and Fc ⁇ RIIIA ( FIGS. 16A and 16B ).
  • alanine variants were found. Some variants exhibited reduced binding to all Fc ⁇ R (G14, FIG. 17 ), while other variants showed reduced binding only to one Fc ⁇ R (G36, FIG. 17 ), improved binding only to one Fc ⁇ R (G15, G54, G55, FIG. 17 ), or simultaneous reduction to one Fc ⁇ R with improvement to another (G16, FIG. 17 ).
  • the IgG Fc variants used in this assay were generated by substituting the VHNL domains of anti-IgE E27 with those from anti-HER2 antibody; HERCEPTIN® (humAb4D5-8 in Table 1 of Carter et al PNAS ( USA ) 89:4285-4289 (1992)).
  • the pattern of ADCC exhibited by the variants correlated well with the pattern of binding to Fc ⁇ RIIIA ( FIGS. 20 and 21 ).
  • variant 36 S298(317)A also showed improvement in ADCC compared to wildtype HERCEPTIN® at 1.25 ng/ml ( FIG. 21 ).
  • allelic variants of several of the human Fc ⁇ R have been found in the human population. These allelic variant forms have been shown to exhibit differences in binding of human and murine IgG and a number of association studies have correlated clinical outcomes with the presence of specific allelic forms (reviewed in Lehrnbecher et al. Blood 94(12):4220-4232 (1999)). Several studies have investigated two forms of Fc ⁇ RIIA, R131 and H131, and their association with clinical outcomes (Hatta et al. Genes and Immunity 1:53-60 (1999); Yap et al. Lupus 8:305-310 (1999); and Lorenz et al. European J. Immunogenetics 22:397-401 (1995)).
  • the pattern of binding of the selected IgG1 variants to the relatively higher affinity Fc ⁇ RIIIA-V158 was the same as for the relatively lower affinity Fc ⁇ RIIIA-F158 (the F158 form was used in assaying all variants).
  • IgG1 variants which showed improved binding to the Fc ⁇ RIIIA-F158 form also showed improved binding to the Fc ⁇ RIIIA-V158 form though the improvement was not as pronounced.
  • Fc ⁇ RIIA-R131 used in assaying all variants
  • Fc ⁇ RIIA-H131 the binding pattern of the selected IgG1 variants did show some distinct differences.
  • S267(280)A, H268(281)A, and S267(280)A/H268(281)A exhibited improved binding to Fc ⁇ RIIA-R131, compared to native IgG1, but not to Fc ⁇ RIIA-H131.
  • S267(280)G showed improved binding to Fc ⁇ RIIA-R131 but reduced binding to Fc ⁇ RIIA-H131 (Table 10).

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