US20140322218A1 - Antibody Constructs for CDH19 and CD3 - Google Patents

Antibody Constructs for CDH19 and CD3 Download PDF

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US20140322218A1
US20140322218A1 US14/165,330 US201414165330A US2014322218A1 US 20140322218 A1 US20140322218 A1 US 20140322218A1 US 201414165330 A US201414165330 A US 201414165330A US 2014322218 A1 US2014322218 A1 US 2014322218A1
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cdr
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antibody construct
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Shouhua Xiao
Zheng Pan
Dineli Wickramasinghe
Shawn Jeffries
Chadwick T. King
Brian Mingtung Chan
Peter Kufer
Ralf Lutterbüse
Tobias Raum
Patrick Hoffmann
Doris Rau
Roman Kischel
Bryan Lemon
Holger Wesche
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Amgen Research Munich GmbH
Amgen Inc
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    • 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
    • C07K16/2803—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily
    • C07K16/2809—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily against the T-cell receptor (TcR)-CD3 complex
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    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/56—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule
    • A61K47/59—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyureas or polyurethanes
    • A61K47/60—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyureas or polyurethanes the organic macromolecular compound being a polyoxyalkylene oligomer, polymer or dendrimer, e.g. PEG, PPG, PEO or polyglycerol
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    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
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    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
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    • 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
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    • 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
    • C07K16/30—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells
    • C07K16/3053—Skin, nerves, brain
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    • A61K39/00—Medicinal preparations containing antigens or antibodies
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    • C07K2317/33—Crossreactivity, e.g. for species or epitope, or lack of said crossreactivity
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    • 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]
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    • C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
    • C07K2317/569—Single domain, e.g. dAb, sdAb, VHH, VNAR or nanobody®
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    • C07K2317/60—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments
    • C07K2317/62—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments comprising only variable region components
    • C07K2317/622—Single chain antibody (scFv)
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    • C07K2317/62—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments comprising only variable region components
    • C07K2317/626—Diabody or triabody
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    • 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
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    • C07K2317/77—Internalization into the cell
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    • C07K2317/90—Immunoglobulins specific features characterized by (pharmaco)kinetic aspects or by stability of the immunoglobulin
    • C07K2317/92—Affinity (KD), association rate (Ka), dissociation rate (Kd) or EC50 value
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
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    • C07K2319/00—Fusion polypeptide

Definitions

  • the present invention relates to an antibody construct comprising a first human binding domain capable of binding to human CDH19 on the surface of a target cell and a second domain capable of binding to human CD3 on the surface of a T cell.
  • the invention provides a nucleic acid sequence encoding the antibody construct, a vector comprising said nucleic acid sequence and a host cell transformed or transfected with said vector.
  • the invention provides a process for the production of the antibody construct of the invention, a medical use of said antibody construct and a kit comprising said antibody construct.
  • Melanoma is a skin cancer that is caused by the oncogenic transformation of melanocytes, which are pigment producing skin cells. As of 2009, Melanoma had a prevalence of more than 870,000 cases in the US alone (US National Institutes of Health). Each year, over 75,000 new cases of melanoma are diagnosed in the US, and approximately 25% of patients have advanced disease at the time of diagnosis. Despite the fact that cases of primary melanoma can be cured by surgery if they are detected early enough, melanoma is the leading cause of death from skin disease in the US, responsible for about 10,000 deaths per year in the US. Once the disease has spread and became metastatic, the prognosis is poor, with a 5 year relative survival of 15%.
  • melanomas There are four basic types of melanomas. Three types are found in the top layers of the skin and the fourth one is invasive and has penetrated deeper into the skin and may have spread to other areas of the body.
  • Superficial spreading melanoma is the most common type of melanoma which accounts for about 70% of all cases. It grows along the top layer of the skin for a fairly long time before penetrating more deeply. It first appears as a flat or slightly raised discolored patch that has irregular borders and may be somewhat asymmetrical in form. The color varies, and you may see areas of tan, brown, black, red, blue or white. This type of melanoma can occur in a previously benign mole and is found most often in young people.
  • Lentigo maligna is similar to the superficial spreading type, as it also remains close to the skin surface for quite a while, and usually appears as a flat or mildly elevated mottled tan, brown or dark brown discoloration. It is found most often in the elderly. When this cancer becomes invasive, it is referred to as lentigo maligna melanoma.
  • Acral lentiginous melanoma also spreads superficially before penetrating more deeply. It is quite different from the others, though, as it usually appears as a black or brown discoloration under the nails or on the soles of the feet or palms of the hands. This type of melanoma is sometimes found on dark-skinned people, and can often advance more quickly than superficial spreading melanoma and lentigo maligna.
  • Nodular melanoma is usually invasive at the time it is first diagnosed. The malignancy is recognized when it becomes a bump. It is usually black, but occasionally is blue, gray, white, brown, tan, red or skin tone. This is the most aggressive of the melanomas, and is found in 10 to 15 percent of cases.
  • metastatic melanoma is a tumor type where immunotherapy has been demonstrated to not only slow disease progression, but to lead to cures in late stage patients.
  • Interleukin-2 was approved for the use in metastatic melanoma in 1998, and in 2011 an antibody targeting CTLA4, a member of a new generation of immune checkpoint inhibitors, gained approval by the FDA.
  • CDH19 is a type II cadherin transmembrane protein of unknown function.
  • the human gene was cloned in 2000 based on its sequence similarity to CDH7 (Kools, P. et al. Genomics. 2000).
  • Expressed Sequence Tags (ESTs) for CDH19 were isolated from melanocyte cDNA libraries, indicating that expression of CDH19 may be limited to cells of neural crest origin (Kools, P. et al. Genomics. 2000).
  • rat CDH19 was found to be expressed primarily in nerve ganglia and in Schwann cells during rat embryonic development (Takahashi, M. and Osumi, O. Devl Dynamics. 2005.).
  • the present invention provides an isolated multispecific antibody construct comprising a first human binding domain capable of binding to human CDH19 on the surface of a target cell and a second domain capable of binding to human CD3 on the surface of a T cell.
  • the first binding domain comprises a VH region comprising CDR-H1, CDR-H2 and CDR-H3 and a VL region comprising CDR-L1, CDR-L2 and CDR-L3 selected from the group consisting of:
  • the invention further provides an embodiment of the antibody construct of the invention, wherein the first binding domain comprises a VH region and a VL region selected from the group consisting of:
  • the antibody construct is in a format selected from the group consisting of (scFv) 2 , (single domain mAb) 2 , scFv-single domain mAb, diabodies and oligomers thereof.
  • the second binding domain is capable of binding to human and Callithrix jacchus, Saguinus Oedipus or Saimiri sciureus CD3 epsilon.
  • the invention further provides a nucleic acid sequence encoding an antibody construct of the invention.
  • the invention provides a vector comprising a nucleic acid sequence of the invention. Moreover, the invention provides a host cell transformed or transfected with the nucleic acid sequence of the invention.
  • the invention provides a process for the production of a antibody construct of the invention, said process comprising culturing a host cell of the invention under conditions allowing the expression of the antibody construct of the invention and recovering the produced antibody construct from the culture.
  • the invention provides a pharmaceutical composition comprising an antibody construct of the invention or produced according to the process of the invention
  • the invention provides the antibody construct of the invention or produced according to the process of the invention for use in the prevention, treatment or amelioration of a melanoma disease or metastatic melanoma disease.
  • the invention also provides a method for the treatment or amelioration of a melanoma disease or metastatic melanoma disease, comprising the step of administering to a subject in need thereof the antibody construct of the invention or produced according to the process of the invention.
  • the melanoma disease or metastatic melanoma disease is selected from the group consisting of superficial spreading melanoma, lentigo maligna, lentigo maligna melanoma, acral lentiginous melanoma and nodular melanoma.
  • the invention provides a kit comprising an antibody construct of the invention, or produced according to the process of the invention, a vector of the invention, and/or a host cell of the invention.
  • FIG. 1 is a diagrammatic representation of FIG. 1 :
  • FIG. 1 depicts cell viability data of Colo-699 cells that have been treated with fully human anti-CDH19 antibodies and a high concentration of a goat anti-human Fc monovalent Fab conjugated with DM1 (DM1-Fab) at a drug-antibody ratio (DAR) ( ⁇ 1.3).
  • FIG. 2
  • FIG. 2 depicts the average cell viability data from a CHL-1 assay plotted against the average cell viability data from the Colo-699 assay.
  • FIG. 3 is a diagrammatic representation of FIG. 3 :
  • FIG. 3 shows the relative expression of CDH19 mRNA in metastatic and primary melanoma samples.
  • FIG. 4
  • FIG. 4 shows the expression of CDH19 protein in human tumor samples by IHC.
  • FIG. 5
  • FIG. 5 shows the results of the analysis of tumor cell lines by flow cytometry and IHC to identify model systems with CDH19 expression similar to human tumors based on the number of CDH19 receptors present on the cell surface.
  • FIG. 6 is a diagrammatic representation of FIG. 6 :
  • FIG. 7
  • Cytotoxic activity of CDH19/CD3 bispecific antibodies as measured in a 48-hour FACS-based cytotoxicity assay. Effector cells: unstimulated human PBMC. Target cells: as indicated. Effector to target cell (E:T)-ratio: 10:1.
  • FIG. 8
  • FIG. 9 is a diagrammatic representation of FIG. 9 .
  • antibody includes embodiments such as monoclonal, chimeric, single chain, humanized and human antibodies, as well as antibody fragments, like, inter alia, Fab fragments.
  • Antibody fragments or derivatives further comprise F(ab′) 2 , Fv, scFv fragments or single domain antibodies such as domain antibodies or nanobodies, single variable domain antibodies or immunoglobulin single variable domain comprising merely one variable domain, which might be VHH, VH or VL, that specifically bind an antigen or epitope independently of other V regions or domains; see, for example, Harlow and Lane (1988) and (1999), loc. cit.; Kontermann and Dübel, Antibody Engineering, Springer, 2nd ed.
  • immunoglobulin single variable domain encompasses not only an isolated antibody single variable domain polypeptide, but also larger polypeptides that comprise one or more monomers of an antibody single variable domain polypeptide sequence.
  • antibody construct Said term also includes diabodies or Dual-Affinity Re-Targeting (DART) antibodies.
  • DART Dual-Affinity Re-Targeting
  • minibodies exemplified by a structure which is as follows: (VH-VL-CH3) 2 , (scFv-CH3) 2 or (scFv-CH3-scFv) 2 , “Fc DART” antibodies and “IgG DART” antibodies, and multibodies such as triabodies.
  • Immunoglobulin single variable domains encompass not only an isolated antibody single variable domain polypeptide, but also larger polypeptides that comprise one or more monomers of an antibody single variable domain polypeptide sequence.
  • (antibody) derivatives can be produced by peptidomimetics.
  • techniques described for the production of single chain antibodies see, inter alia, U.S. Pat. No. 4,946,778, Kontermann and Dübel (2010), loc. cit. and Little (2009), loc. cit.
  • transgenic animals may be used to express humanized antibodies specific for polypeptides and fusion proteins of this invention.
  • any technique, providing antibodies produced by continuous cell line cultures can be used.
  • Examples for such techniques include the hybridoma technique (Köhler and Milstein Nature 256 (1975), 495-497), the trioma technique, the human B-cell hybridoma technique (Kozbor, Immunology Today 4 (1983), 72) and the EBV-hybridoma technique to produce human monoclonal antibodies (Cole et al., Monoclonal Antibodies and Cancer Therapy, Alan R. Liss, Inc. (1985), 77-96).
  • antibody comprises antibody constructs, which may be expressed in a host as described herein below, e.g. antibody constructs which may be transfected and/or transduced via, inter alia, viruses or plasmid vectors.
  • antibody as employed in the invention also relates to derivatives or variants of the antibodies described herein which display the same specificity as the described antibodies.
  • an antigen-binding domain refers to a part of an antibody molecule that comprises amino acids responsible for the specific binding between antibody and antigen.
  • the part of the antigen that is specifically recognized and bound by the antibody is referred to as the “epitope” as described herein above.
  • an antigen-binding domain may typically comprise an antibody light chain variable region (VL) and an antibody heavy chain variable region (VH); however, it does not have to comprise both.
  • Fd fragments for example, have two VH regions and often retain some antigen-binding function of the intact antigen-binding domain.
  • antigen-binding fragments of an antibody include (1) a Fab fragment, a monovalent fragment having the VL, VH, CL and CH1 domains; (2) a F(ab′)2 fragment, a bivalent fragment having two Fab fragments linked by a disulfide bridge at the hinge region; (3) a Fd fragment having the two VH and CH1 domains; (4) a Fv fragment having the VL and VH domains of a single arm of an antibody, (5) a dAb fragment (Ward et al., (1989) Nature 341:544-546), which has a VH domain; (6) an isolated complementarity determining region (CDR), and (7) a single chain Fv (scFv).
  • a Fab fragment a monovalent fragment having the VL, VH, CL and CH1 domains
  • F(ab′)2 fragment a bivalent fragment having two Fab fragments linked by a disulfide bridge at the hinge region
  • a Fd fragment having the two VH
  • the two domains of the Fv fragment, VL and VH are coded for by separate genes, they can be joined, using recombinant methods, by a synthetic linker that enables them to be made as a single protein chain in which the VL and VH regions pair to form monovalent molecules (known as single chain Fv (scFv); see e.g., Huston et al. (1988) Proc. Natl. Acad. Sci. USA 85:5879-5883).
  • scFv single chain Fv
  • 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 and/or post-translation modifications (e.g., isomerizations, amidations) 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 which typically include different antibodies directed against different determinants (epitopes), each monoclonal antibody is directed against a single determinant on the antigen.
  • the monoclonal antibodies are advantageous in that they are synthesized by the hybridoma culture, uncontaminated by other immunoglobulins.
  • 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.
  • human antibody includes antibodies having variable and constant regions corresponding substantially to human germline immunoglobulin sequences known in the art, including, for example, those described by Kabat et al. (See Kabat et al. (1991) loc. cit.).
  • the human antibodies of the invention may include amino acid residues not encoded by human germline immunoglobulin sequences (e.g., mutations introduced by random or site-specific mutagenesis in vitro or by somatic mutation in vivo), for example in the CDRs, and in particular, CDR3.
  • the human antibody can have at least one, two, three, four, five, or more positions replaced with an amino acid residue that is not encoded by the human germline immunoglobulin sequence. It is emphasized that the definition of human antibodies as used herein also contemplates fully human antibodies, which include only non-artificially and/or genetically altered human sequences of antibodies as those can be derived by using technologies using systems such as the Xenomice.
  • antibody variants include humanized variants of non-human antibodies, “affinity matured” antibodies (see, e.g. Hawkins et al. J. Mol. Biol. 254, 889-896 (1992) and Lowman et al., Biochemistry 30, 10832-10837 (1991)) and antibody mutants with altered effector function (s) (see, e.g., U.S. Pat. No. 5,648,260, Kontermann and Dübel (2010), loc. cit. and Little (2009), loc. cit.).
  • in vitro generated antibody refers to an antibody where all or part of the variable region (e.g., at least one CDR) is generated in a non-immune cell selection (e.g., an in vitro phage display, protein chip or any other method in which candidate sequences can be tested for their ability to bind to an antigen). This term thus preferably excludes sequences generated by genomic rearrangement in an immune cell.
  • the pairing of a VH and VL together forms a single antigen-binding site.
  • the CH domain most proximal to VH is designated as CH1.
  • Each L chain is linked to an H chain by one covalent disulfide bond, while the two H chains are linked to each other by one or more disulfide bonds depending on the H chain isotype.
  • the VH and VL domains consist of four regions of relatively conserved sequences called framework regions (FR1, FR2, FR3, and FR4), which form a scaffold for three regions of hypervariable sequences (complementarity determining regions, CDRs).
  • the CDRs contain most of the residues responsible for specific interactions of the antibody with the antigen.
  • CDRs are referred to as CDR 1, CDR2, and CDR3. Accordingly, CDR constituents on the heavy chain are referred to as H1, H2, and H3, while CDR constituents on the light chain are referred to as L1, L2, and L3.
  • variable refers to the portions of the immunoglobulin domains that exhibit variability in their sequence and that are involved in determining the specificity and binding affinity of a particular antibody (i.e., the “variable domain(s)”). Variability is not evenly distributed throughout the variable domains of antibodies; it is concentrated in sub-domains of each of the heavy and light chain variable regions. These sub-domains are called “hypervariable” regions or “complementarity determining regions” (CDRs). The more conserved (i.e., non-hypervariable) portions of the variable domains are called the “framework” regions (FRM).
  • CDRs complementarity determining regions
  • variable domains of naturally occurring heavy and light chains each comprise four FRM regions, largely adopting a ⁇ -sheet configuration, connected by three hypervariable regions, which form loops connecting, and in some cases forming part of, the ⁇ -sheet structure.
  • the hypervariable regions in each chain are held together in close proximity by the FRM and, with the hypervariable regions from the other chain, contribute to the formation of the antigen-binding site (see Kabat et al., loc. cit.).
  • the constant domains are not directly involved in antigen binding, but exhibit various effector functions, such as, for example, antibody-dependent, cell-mediated cytotoxicity and complement activation.
  • CDR refers to a complementarity determining region (CDR) of which three make up the binding character of a light chain variable region (CDRL1, CDRL2 and CDRL3) and three make up the binding character of a heavy chain variable region (CDRH1, CDRH2 and CDRH3).
  • CDRs contribute to the functional activity of an antibody molecule and are separated by amino acid sequences that comprise scaffolding or framework regions.
  • the exact definitional CDR boundaries and lengths are subject to different classification and numbering systems. CDRs may therefore be referred to by Kabat, Chothia, contact or any other boundary definitions, including the numbering system described herein.
  • CDR definitions according to these systems may therefore differ in length and boundary areas with respect to the adjacent framework region. See for example Kabat, Chothia, and/or MacCallum (Kabat et al., loc. cit.; Chothia et al., J. Mol. Biol, 1987, 196: 901; and MacCallum et al., J. Mol. Biol, 1996, 262: 732). However, the numbering in accordance with the so-called Kabat system is preferred.
  • the CDR3 of the light chain and, particularly, CDR3 of the heavy chain may constitute the most important determinants in antigen binding within the light and heavy chain variable regions.
  • the heavy chain CDR3 appears to constitute the major area of contact between the antigen and the antibody.
  • In vitro selection schemes in which CDR3 alone is varied can be used to vary the binding properties of an antibody or determine which residues contribute to the binding of an antigen.
  • Consisting essentially of means that the amino acid sequence can vary by about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15% relative to the recited SEQ ID NO: sequence and still retain biological activity, as described herein.
  • the antibody constructs of the invention are isolated proteins or substantially pure proteins.
  • An “isolated” protein is unaccompanied by at least some of the material with which it is normally associated in its natural state, for example constituting at least about 5%, or at least about 50% by weight of the total protein in a given sample. It is understood that the isolated protein may constitute from 5 to 99.9% by weight of the total protein content depending on the circumstances. For example, the protein may be made at a significantly higher concentration through the use of an inducible promoter or high expression promoter, such that the protein is made at increased concentration levels.
  • the definition includes the production of an antigen binding protein in a wide variety of organisms and/or host cells that are known in the art.
  • sequence identity and/or similarity is determined by using standard techniques known in the art, including, but not limited to, the local sequence identity algorithm of Smith and Waterman, 1981 , Adv. Appl. Math. 2:482, the sequence identity alignment algorithm of Needleman and Wunsch, 1970 , J. Mol. Biol. 48:443, the search for similarity method of Pearson and Lipman, 1988 , Proc. Nat. Acad. Sci. U.S.A. 85:2444, computerized implementations of these algorithms (GAP, BESTFIT, FASTA, and TFASTA in the Wisconsin Genetics Software Package, Genetics Computer Group, 575 Science Drive, Madison, Wis.), the Best Fit sequence program described by Devereux et al., 1984 , Nucl.
  • Acid Res. 12:387-395 preferably using the default settings, or by inspection.
  • percent identity is calculated by FastDB based upon the following parameters: mismatch penalty of 1; gap penalty of 1; gap size penalty of 0.33; and joining penalty of 30, “Current Methods in Sequence Comparison and Analysis,” Macromolecule Sequencing and Synthesis, Selected Methods and Applications, pp 127-149 (1988), Alan R. Liss, Inc.
  • PILEUP creates a multiple sequence alignment from a group of related sequences using progressive, pairwise alignments. It can also plot a tree showing the clustering relationships used to create the alignment. PILEUP uses a simplification of the progressive alignment method of Feng & Doolittle, 1987 , J. Mol. Evol. 35:351-360; the method is similar to that described by Higgins and Sharp, 1989, CABIOS 5:151-153.
  • Useful PILEUP parameters including a default gap weight of 3.00, a default gap length weight of 0.10, and weighted end gaps.
  • BLAST algorithm Another example of a useful algorithm is the BLAST algorithm, described in: Altschul et al., 1990 , J. Mol. Biol. 215:403-410; Altschul et al., 1997 , Nucleic Acids Res. 25:3389-3402; and Karin et al., 1993 , Proc. Natl. Acad. Sci. U.S.A. 90:5873-5787.
  • a particularly useful BLAST program is the WU-BLAST-2 program which was obtained from Altschul et al., 1996 , Methods in Enzymology 266:460-480. WU-BLAST-2 uses several search parameters, most of which are set to the default values.
  • the HSP S and HSP S2 parameters are dynamic values and are established by the program itself depending upon the composition of the particular sequence and composition of the particular database against which the sequence of interest is being searched; however, the values may be adjusted to increase sensitivity.
  • Gapped BLAST uses BLOSUM-62 substitution scores; threshold T parameter set to 9; the two-hit method to trigger ungapped extensions, charges gap lengths of k a cost of 10+k; Xu set to 16, and Xg set to 40 for database search stage and to 67 for the output stage of the algorithms. Gapped alignments are triggered by a score corresponding to about 22 bits.
  • amino acid homology, similarity, or identity between individual variant CDRs are at least 80% to the sequences depicted herein, and more typically with preferably increasing homologies or identities of at least 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, and almost 100%.
  • “percent (%) nucleic acid sequence identity” with respect to the nucleic acid sequence of the binding proteins identified herein is defined as the percentage of nucleotide residues in a candidate sequence that are identical with the nucleotide residues in the coding sequence of the antigen binding protein.
  • a specific method utilizes the BLASTN module of WU-BLAST-2 set to the default parameters, with overlap span and overlap fraction set to 1 and 0.125, respectively.
  • nucleic acid sequence homology, similarity, or identity between the nucleotide sequences encoding individual variant CDRs and the nucleotide sequences depicted herein are at least 80%, and more typically with preferably increasing homologies or identities of at least 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99%, and almost 100%.
  • a “variant CDR” is one with the specified homology, similarity, or identity to the parent CDR of the invention, and shares biological function, including, but not limited to, at least 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% of the specificity and/or activity of the parent CDR.
  • the mutation per se need not be predetermined.
  • random mutagenesis may be conducted at the target codon or region and the expressed antigen binding protein CDR variants screened for the optimal combination of desired activity.
  • Techniques for making substitution mutations at predetermined sites in DNA having a known sequence are well known, for example, M13 primer mutagenesis and PCR mutagenesis. Screening of the mutants is done using assays of antigen binding protein activities, such as CDH19 binding.
  • amino acid typically refers to an amino acid having its art recognized definition such as an amino acid selected from the group consisting of: alanine (Ala or A); arginine (Arg or R); asparagine (Asn or N); aspartic acid (Asp or D); cysteine (Cys or C); glutamine (Gln or Q); glutamic acid (Glu or E); glycine (Gly or G); histidine (H is or H); isoleucine (He or I): leucine (Leu or L); lysine (Lys or K); methionine (Met or M); phenylalanine (Phe or F); pro line (Pro or P); serine (Ser or S); threonine (Thr or T); tryptophan (Trp or W); tyrosine (Tyr or Y); and valine (Val or V), although modified, synthetic, or rare amino acids may be used as desired.
  • alanine Al or A
  • arginine
  • amino acids can be grouped as having a nonpolar side chain (e.g., Ala, Cys, He, Leu, Met, Phe, Pro, Val); a negatively charged side chain (e.g., Asp, Glu); a positively charged sidechain (e.g., Arg, His, Lys); or an uncharged polar side chain (e.g., Asn, Cys, Gln, Gly, His, Met, Phe, Ser, Thr, Trp, and Tyr).
  • a nonpolar side chain e.g., Ala, Cys, He, Leu, Met, Phe, Pro, Val
  • a negatively charged side chain e.g., Asp, Glu
  • a positively charged sidechain e.g., Arg, His, Lys
  • an uncharged polar side chain e.g., Asn, Cys, Gln, Gly, His, Met, Phe, Ser, Thr, Trp, and Tyr.
  • hypervariable region also known as “complementarity determining regions” or CDRs
  • CDRs complementarity determining regions
  • CDR residues are preferably identified in accordance with the so-called Kabat (numbering) system.
  • framework region refers to the art-recognized portions of an antibody variable region that exist between the more divergent (i.e., hypervariable) CDRs.
  • framework regions are typically referred to as frameworks 1 through 4 (FR1, FR2, FR3, and FR4) and provide a scaffold for the presentation of the six CDRs (three from the heavy chain and three from the light chain) in three dimensional space, to form an antigen-binding surface.
  • CDRs form a loop structure that can be classified as a canonical structure.
  • canonical structure refers to the main chain conformation that is adopted by the antigen binding (CDR) loops. From comparative structural studies, it has been found that five of the six antigen binding loops have only a limited repertoire of available conformations. Each canonical structure can be characterized by the torsion angles of the polypeptide backbone. Correspondent loops between antibodies may, therefore, have very similar three dimensional structures, despite high amino acid sequence variability in most parts of the loops (Chothia and Lesk, J. Mol. Biol., 1987, 196: 901; Chothia et al., Nature, 1989, 342: 877; Martin and Thornton, J.
  • the conformation of a particular canonical class is determined by the length of the loop and the amino acid residues residing at key positions within the loop, as well as within the conserved framework (i.e., outside of the loop). Assignment to a particular canonical class can therefore be made based on the presence of these key amino acid residues.
  • the term “canonical structure” may also include considerations as to the linear sequence of the antibody, for example, as catalogued by Kabat (Kabat et al., loc. cit.).
  • the Kabat numbering scheme (system) is a widely adopted standard for numbering the amino acid residues of an antibody variable domain in a consistent manner and is the preferred scheme applied in the present invention as also mentioned elsewhere herein. Additional structural considerations can also be used to determine the canonical structure of an antibody. For example, those differences not fully reflected by Kabat numbering can be described by the numbering system of Chothia et al and/or revealed by other techniques, for example, crystallography and two or three-dimensional computational modeling. Accordingly, a given antibody sequence may be placed into a canonical class which allows for, among other things, identifying appropriate chassis sequences (e.g., based on a desire to include a variety of canonical structures in a library). Kabat numbering of antibody amino acid sequences and structural considerations as described by Chothia et al., loc. cit. and their implications for construing canonical aspects of antibody structure, are described in the literature.
  • CDR3 is typically the greatest source of molecular diversity within the antibody-binding site.
  • H3 for example, can be as short as two amino acid residues or greater than 26 amino acids.
  • the subunit structures and three-dimensional configurations of different classes of immunoglobulins are well known in the art. For a review of the antibody structure, see Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory, eds. Harlow et al., 1988.
  • each subunit structure e.g., a CH, VH, CL, VL, CDR, FR structure
  • comprises active fragments e.g., the portion of the VH, VL, or CDR subunit the binds to the antigen, i.e., the antigen-binding fragment, or, e.g., the portion of the CH subunit that binds to and/or activates, e.g., an Fc receptor and/or complement.
  • the CDRs typically refer to the Kabat CDRs, as described in Sequences of Proteins of immunological Interest, US Department of Health and Human Services (1991), eds. Kabat et al.
  • Another standard for characterizing the antigen binding site is to refer to the hypervariable loops as described by Chothia. See, e.g., Chothia, et al. (1987; J. Mol. Biol. 227:799-817); and Tomlinson et al. (1995) EMBO J. 14: 4628-4638. Still another standard is the AbM definition used by Oxford Molecular's AbM antibody modeling software. See, generally, e.g., Protein Sequence and Structure Analysis of Antibody Variable Domains. In: Antibody Engineering Lab Manual (Ed.: Duebel, S, and Kontermann, R., Springer-Verlag, Heidelberg). Embodiments described with respect to Kabat CDRs can alternatively be implemented using similar described relationships with respect to Chothia hypervariable loops or to the AbM-defined loops.
  • the sequence of antibody genes after assembly and somatic mutation is highly varied, and these varied genes are estimated to encode 10 10 different antibody molecules (Immunoglobulin Genes, 2 nd ed., eds. Jonio et al., Academic Press, San Diego, Calif., 1995). Accordingly, the immune system provides a repertoire of immunoglobulins.
  • the term “repertoire” refers to at least one nucleotide sequence derived wholly or partially from at least one sequence encoding at least one immunoglobulin.
  • the sequence(s) may be generated by rearrangement in vivo of the V, D, and J segments of heavy chains, and the V and J segments of light chains.
  • sequence(s) can be generated from a cell in response to which rearrangement occurs, e.g., in vitro stimulation.
  • part or all of the sequence(s) may be obtained by DNA splicing, nucleotide synthesis, mutagenesis, and other methods, see, e.g., U.S. Pat. No. 5,565,332.
  • a repertoire may include only one sequence or may include a plurality of sequences, including ones in a genetically diverse collection.
  • binding molecule or “antibody construct” in the sense of the present disclosure indicates any molecule capable of (specifically) binding to, interacting with or recognizing the target molecules CDH19 and CD3.
  • Such molecules or constructs may include proteinaceous parts and non-proteinaceous parts (e.g. chemical linkers or chemical cross-linking agents such as glutaraldehyde).
  • the antibody construct of the invention is a “bispecific single chain antibody construct”, more prefereably a bispecific single chain Fv (scFv).
  • Bispecific single chain molecules are known in the art and are described in WO 99/54440, Mack, J. Immunol. (1997), 158, 3965-3970, Mack, PNAS, (1995), 92, 7021-7025, Kufer, Cancer Immunol.
  • variable domains comprised in the herein described antibody constructs may be connected by additional linker sequences.
  • peptide linker defines in accordance with the present invention an amino acid sequence by which the amino acid sequences of the first domain and the second domain of the antibody construct of the invention are linked with each other.
  • An essential technical feature of such peptide linker is that said peptide linker does not comprise any polymerization activity.
  • suitable peptide linkers are those described in U.S. Pat. Nos. 4,751,180 and 4,935,233 or WO 88/09344.
  • a preferred embodiment of a peptide linker is characterized by the amino acid sequence Gly-Gly-Gly-Gly-Ser, i.e.
  • Gly 4 Ser or polymers thereof, i.e. (Gly 4 Ser) x , where x is an integer 1 or greater.
  • the characteristics of said peptide linker, which comprise the absence of the promotion of secondary structures are known in the art and described e.g. in Dall'Acqua et al. (Biochem. (1998) 37, 9266-9273), Cheadle et al. (Mol Immunol (1992) 29, 21-30) and Raag and Whitlow (FASEB (1995) 9(1), 73-80).
  • Peptide linkers which also do not promote any secondary structures are preferred.
  • the linkage of said domains to each other can be provided by, e.g. genetic engineering, as described in the examples.
  • peptide linkers which connect the at least two binding domains in the antibody construct of the invention
  • peptide linkers which comprise only a few number of amino acid residues, e.g. 12 amino acid residues or less.
  • peptide linker of 12, 11, 10, 9, 8, 7, 6 or 5 amino acid residues are preferred.
  • An envisaged peptide linker with less than 5 amino acids comprises 4, 3, 2 or one amino acid(s) wherein Gly-rich linkers are preferred.
  • a particularly preferred “single” amino acid in context of said “peptide linker” is Gly. Accordingly, said peptide linker may consist of the single amino acid Gly.
  • multispecific refers to a binding molecule which is an antibody construct and comprises at least a first and a second binding domain, wherein the first binding domain is capable of binding to one antigen or target, and the second binding domain is capable of binding to another antigen or target. Accordingly, antibody constructs according to the invention comprise at least specificities for two different antigens or targets and are at least bispecific.
  • the “antibody construct” of the invention also comprises multispecific binding molecules such as e.g. trispecific binding molecules, the latter ones including three binding domains.
  • the antibody construct of the invention has, in addition to its function to bind to the target molecules CDH19 and CD3, a further function.
  • the antibody construct is a tri- or multifunctional antibody construct by targeting plasma cells through binding to CDH19, mediating cytotoxic T cell activity through CD3 binding and providing a further function such as a fully functional Fc constant domain mediating antibody-dependent cellular cytotoxicity through recruitment of effector cells like NK cells, a label (fluorescent etc.), a therapeutic agent such as, e.g. a toxin or radionuclide, and/or means to enhance serum half-life, etc.
  • binding domain characterizes in connection with the present invention a domain which is capable of specifically binding to/interacting with a given target epitope or a given target site on the target molecules CDH19 and CD3.
  • Binding domains can be derived from a binding domain donor such as for example an antibody. It is envisaged that a binding domain of the present invention comprises at least said part of any of the aforementioned binding domains that is required for binding to/interacting with a given target epitope or a given target site on the target molecules CDH19 and CD3.
  • the binding domain of the aforementioned binding domain donors is characterized by that part of these donors that is responsible for binding the respective target, i.e. when that part is removed from the binding domain donor, said donor loses its binding capability.
  • “Loses” means a reduction of at least 50% of the binding capability when compared with the binding donor. Methods to map these binding sites are well known in the art—it is therefore within the standard knowledge of the skilled person to locate/map the binding site of a binding domain donor and, thereby, to “derive” said binding domain from the respective binding domain donors.
  • epitope refers to a site on an antigen to which a binding domain, such as an antibody or immunoglobulin or derivative or fragment of an antibody or of an immunoglobulin, specifically binds.
  • a binding domain such as an antibody or immunoglobulin or derivative or fragment of an antibody or of an immunoglobulin, specifically binds.
  • An “epitope” is antigenic and thus the term epitope is sometimes also referred to herein as “antigenic structure” or “antigenic determinant”.
  • the binding domain is an “antigen-interaction-site”. Said binding/interaction is also understood to define a “specific recognition”.
  • said binding domain which (specifically) binds to/interacts with a given target epitope or a given target site on the target molecules CDH19 and CD3 is an antibody or immunoglobulin, and said binding domain is a VH and/or VL region of an antibody or of an immunoglobulin.
  • Epitopes can be formed both by contiguous amino acids or non-contiguous amino acids juxtaposed by tertiary folding of a protein.
  • a “linear epitope” is an epitope where an amino acid primary sequence comprises the recognized epitope.
  • a linear epitope typically includes at least 3 or at least 4, and more usually, at least 5 or at least 6 or at least 7, for example, about 8 to about 10 amino acids in a unique sequence.
  • a “conformational epitope”, in contrast to a linear epitope, is an epitope wherein the primary sequence of the amino acids comprising the epitope is not the sole defining component of the epitope recognized (e.g., an epitope wherein the primary sequence of amino acids is not necessarily recognized by the binding domain).
  • a conformational epitope comprises an increased number of amino acids relative to a linear epitope.
  • the binding domain recognizes a three-dimensional structure of the antigen, preferably a peptide or protein or fragment thereof (in the context of the present invention, the antigen for one of the binding domains is comprised within the CDH19 protein).
  • a protein molecule folds to form a three-dimensional structure, certain amino acids and/or the polypeptide backbone forming the conformational epitope become juxtaposed enabling the antibody to recognize the epitope.
  • Methods of determining the conformation of epitopes include, but are not limited to, x-ray crystallography, two-dimensional nuclear magnetic resonance (2D-NMR) spectroscopy and site-directed spin labelling and electron paramagnetic resonance (EPR) spectroscopy.
  • EPR electron paramagnetic resonance
  • the provided examples describe a further method to characterize a given binding domain by way of binning, which includes a test whether the given binding domain binds to one or more epitope cluster(s) of a given protein, in particular CDH19.
  • epitope cluster denotes the entirety of epitopes lying in a defined contiguous stretch of an antigen.
  • An epitope cluster can comprise one, two or more epitopes.
  • the concept of epitope cluster is also used in the characterization of the features of the antibody constructs of the invention.
  • binding domain is capable of specifically interacting with one or more, preferably at least two, more preferably at least three and most preferably at least four amino acids of an epitope.
  • binding domain exhibits appreciable affinity for a particular protein or antigen and, generally, does not exhibit significant reactivity with proteins or antigens other than CDH19 or CD3.
  • Appreciable affinity includes binding with an affinity of about 10 ⁇ 6 M (KD) or stronger.
  • binding is considered specific when binding affinity is about 10 ⁇ 12 to 10 ⁇ 8 M, 10 ⁇ 12 to 10 ⁇ 9 M, 10 ⁇ 12 to 10 ⁇ 19 M, 10 ⁇ 11 to 10 ⁇ 8 M, preferably of about 10 ⁇ 11 to 10 ⁇ 9 M.
  • a binding domain specifically reacts with or binds to a target can be tested readily by, inter alia, comparing the reaction of said binding domain with a target protein or antigen with the reaction of said binding domain with proteins or antigens other than CDH19 or CD3.
  • a binding domain of the invention does not essentially bind or is not capable of binding to proteins or antigens other than CDH19 or CD3 (i.e. the first binding domain is not capable of binding to proteins other than CDH19 and the second binding domain is not capable of binding to proteins other than CD3).
  • binding domain of the present invention does not bind another protein or antigen other than CDH19 or CD3, i.e., does not show reactivity of more than 30%, preferably not more than 20%, more preferably not more than 10%, particularly preferably not more than 9%, 8%, 7%, 6% or 5% with proteins or antigens other than CDH19 or CD3, whereby binding to CDH19 or CD3, respectively, is set to be 100%.
  • Specific binding is believed to be effected by specific motifs in the amino acid sequence of the binding domain and the antigen. Thus, binding is achieved as a result of their primary, secondary and/or tertiary structure as well as the result of secondary modifications of said structures.
  • the specific interaction of the antigen-interaction-site with its specific antigen may result in a simple binding of said site to the antigen.
  • the specific interaction of the antigen-interaction-site with its specific antigen may alternatively or additionally result in the initiation of a signal, e.g. due to the induction of a change of the conformation of the antigen, an oligomerization of the antigen, etc.
  • Proteins (including fragments thereof, preferably biologically active fragments, and peptides, usually having less than 30 amino acids) comprise one or more amino acids coupled to each other via a covalent peptide bond (resulting in a chain of amino acids).
  • polypeptide as used herein describes a group of molecules, which consist of more than 30 amino acids. Polypeptides may further form multimers such as dimers, trimers and higher oligomers, i.e. consisting of more than one polypeptide molecule. Polypeptide molecules forming such dimers, trimers etc. may be identical or non-identical. The corresponding higher order structures of such multimers are, consequently, termed homo- or heterodimers, homo- or heterotrimers etc.
  • polypeptide and “protein” also refer to naturally modified polypeptides/proteins wherein the modification is effected e.g. by post-translational modifications like glycosylation, acetylation, phosphorylation and the like.
  • a “polypeptide” when referred to herein may also be chemically modified such as pegylated. Such modifications are well known in the art.
  • isolated when used to describe the antibody construct disclosed herein, means a antibody construct that has been identified, separated and/or recovered from a component of its production environment. Preferably, the isolated antibody construct is free of association with all other components from its production environment. Contaminant components of its production environment, such as that resulting from recombinant transfected cells, are materials that would typically interfere with diagnostic or therapeutic uses for the polypeptide, and may include enzymes, hormones, and other proteinaceous or non-proteinaceous solutes.
  • the antibody construct will be purified (1) 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 (2) to homogeneity by SDS-PAGE under non-reducing or reducing conditions using Coomassie blue or, preferably, silver stain. Ordinarily, however, an isolated antibody will be prepared by at least one purification step.
  • Amino acid sequence modifications of the antibody constructs described herein are contemplated. For example, it may be desirable to improve the binding affinity and/or other biological properties of the antibody.
  • Amino acid sequence variants of the antibody constructs are prepared by introducing appropriate nucleotide changes into the antibody constructs nucleic acid, or by peptide synthesis.
  • Such modifications include, for example, deletions from, and/or insertions into, and/or substitutions of, residues within the amino acid sequences of the antibody constructs. Any combination of deletion, insertion, and substitution is made to arrive at the final construct, provided that the final construct possesses the desired characteristics.
  • the amino acid changes also may alter post-translational processes of the antibody constructs, such as changing the number or position of glycosylation sites.
  • 1, 2, 3, 4, 5, 6, 7, 8, 9, or amino acids may be substituted in a CDR, while 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or 25 amino acids may be substituted in the framework regions (FRs).
  • the substitutions are preferably conservative substitutions as described herein.
  • 1, 2, 3, 4, 5, or 6 amino acids may be inserted or deleted in each of the CDRs (of course, dependent on their length), while 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or 25 amino acids may be inserted or deleted in each of the FRs.
  • a useful method for identification of certain residues or regions of the antibody constructs that are preferred locations for mutagenesis is called “alanine scanning mutagenesis” as described by Cunningham and Wells in Science, 244: 1081-1085 (1989).
  • a residue or group of target residues within the antibody construct is/are identified (e.g. charged residues such as arg, asp, his, lys, and glu) and replaced by a neutral or negatively charged amino acid (most preferably alanine or polyalanine) to affect the interaction of the amino acids with the epitope.
  • Those amino acid locations demonstrating functional sensitivity to the substitutions then are refined by introducing further or other variants at, or for, the sites of substitution.
  • the site for introducing an amino acid sequence variation is predetermined, the nature of the mutation per se needs not to be predetermined. For example, to analyze the performance of a mutation at a given site, ala scanning or random mutagenesis is conducted at a target codon or region and the expressed antibody construct variants are screened for the desired activity.
  • amino acid sequence insertions include amino- and/or carboxyl-terminal fusions ranging in length from 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 residues to polypeptides containing a hundred or more residues, as well as intrasequence insertions of single or multiple amino acid residues.
  • An insertional variant of the antibody construct includes the fusion to the N- or C-terminus of the antibody to an enzyme or a fusion to a polypeptide which increases the serum half-life of the antibody.
  • variants are an amino acid substitution variant. These variants have preferably at least 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid residues in the antibody construct replaced by a different residue.
  • the sites of greatest interest for substitutional mutagenesis include the CDRs of the heavy and/or light chain, in particular the hypervariable regions, but FR alterations in the heavy and/or light chain are also contemplated.
  • a CDR sequence encompasses 6 amino acids, it is envisaged that one, two or three of these amino acids are substituted. Similarly, if a CDR sequence encompasses 15 amino acids it is envisaged that one, two, three, four, five or six of these amino acids are substituted.
  • the then-obtained “substituted” sequence is at least 60%, more preferably 65%, even more preferably 70%, particularly preferably 75%, more particularly preferably 80% identical to the “original” CDR sequence. This means that it is dependent of the length of the CDR to which degree it is identical to the “substituted” sequence.
  • a CDR having 5 amino acids is preferably 80% identical to its substituted sequence in order to have at least one amino acid substituted.
  • the CDRs of the antibody construct may have different degrees of identity to their substituted sequences, e.g., CDRL1 may have 80%, while CDRL3 may have 90%.
  • substitutions are conservative substitutions.
  • any substitution including non-conservative substitution or one or more from the “exemplary substitutions” listed in Table 1, below is envisaged as long as the antibody construct retains its capability to bind to CDH19 via the first binding domain and to CD3 epsilon via the second binding domain and/or its CDRs have an identity to the then substituted sequence (at least 60%, more preferably 65%, even more preferably 70%, particularly preferably 75%, more particularly preferably 80% identical to the “original” CDR sequence).
  • Substantial modifications in the biological properties of the antibody construct of the present invention are accomplished by selecting substitutions that differ significantly in their effect on maintaining (a) the structure of the polypeptide backbone in the area of the substitution, for example, as a sheet or helical conformation, (b) the charge or hydrophobicity of the molecule at the target site, or (c) the bulk of the side chain.
  • Naturally occurring residues are divided into groups based on common side-chain properties: (1) hydrophobic: norleucine, met, ala, val, leu, ile; (2) neutral hydrophilic: cys, ser, thr; (3) acidic: asp, glu; (4) basic: asn, gin, his, lys, arg; (5) residues that influence chain orientation: gly, pro; and (6) aromatic: trp, tyr, phe.
  • Non-conservative substitutions will entail exchanging a member of one of these classes for another class. Any cysteine residue not involved in maintaining the proper conformation of the antibody construct may be substituted, generally with serine, to improve the oxidative stability of the molecule and prevent aberrant crosslinking. Conversely, cysteine bond(s) may be added to the antibody to improve its stability (particularly where the antibody is an antibody fragment such as an Fv fragment).
  • a particularly preferred type of substitutional variant involves substituting one or more hypervariable region residues of a parent antibody (e.g. a humanized or human antibody).
  • a parent antibody e.g. a humanized or human antibody
  • the resulting variant(s) selected for further development will have improved biological properties relative to the parent antibody from which they are generated.
  • a convenient way for generating such substitutional variants involves affinity maturation using phage display. Briefly, several hypervariable region sites (e.g. 6-7 sites) are mutated to generate all possible amino acid substitutions at each site.
  • the antibody variants thus generated are displayed in a monovalent fashion from filamentous phage particles as fusions to the gene III product of M13 packaged within each particle. The phage-displayed variants are then screened for their biological activity (e.g. binding affinity) as herein disclosed.
  • alanine scanning mutagenesis can be performed to identify hypervariable region residues contributing significantly to antigen binding.
  • Such contact residues and neighbouring residues are candidates for substitution according to the techniques elaborated herein.
  • the antibody construct may be linked to one of a variety of non-proteinaceous polymers, e.g., polyethylene glycol, polypropylene glycol, polyoxyalkylenes, or copolymers of polyethylene glycol and polypropylene glycol.
  • non-proteinaceous polymers e.g., polyethylene glycol, polypropylene glycol, polyoxyalkylenes, or copolymers of polyethylene glycol and polypropylene glycol.
  • the antibody construct may also be entrapped in microcapsules prepared, for example, by coacervation techniques or by interfacial polymerization (for example, hydroxymethylcellulose or gelatine-microcapsules and poly (methylmethacylate) microcapsules, respectively), in colloidal drug delivery systems (for example, liposomes, albumin microspheres, microemulsions, nanoparticles and nanocapsules), or in macroemulsions.
  • colloidal drug delivery systems for example, liposomes, albumin microspheres, microemulsions, nanoparticles and nanocapsules
  • the antibody constructs disclosed herein may also be formulated as immuno-liposomes.
  • a “liposome” is a small vesicle composed of various types of lipids, phospholipids and/or surfactant which is useful for delivery of a drug to a mammal. The components of the liposome are commonly arranged in a bilayer formation, similar to the lipid arrangement of biological membranes. Liposomes containing the antibody are prepared by methods known in the art, such as described in Epstein et al., Proc. Natl. Acad. Sci. USA, 82: 3688 (1985); Hwang et al., Proc. Natl. Acad. Sci. USA, 77: 4030 (1980); U.S. Pat. Nos.
  • Liposomes with enhanced circulation time are disclosed in U.S. Pat. No. 5,013,556.
  • Particularly useful liposomes can be generated by the reverse phase evaporation method with a lipid composition comprising phosphatidylcholine, cholesterol and PEG-derivatized phosphatidylethanolamine (PEG-PE).
  • PEG-PE PEG-derivatized phosphatidylethanolamine
  • Liposomes are extruded through filters of defined pore size to yield liposomes with the desired diameter.
  • Fab′ fragments of the antibody of the present invention can be conjugated to the liposomes as described in Martin et al. J. Biol. Chem. 257: 286-288 (1982) via a disulfide interchange reaction.
  • a chemotherapeutic agent is optionally contained within the liposome. See Gabizon et al. J. National Cancer Inst. 81 (19) 1484 (1989).
  • the antibody construct can be produced intracellularly, in the periplasmic space, or directly secreted into the medium. If the antibody construct is produced intracellularly, as a first step, the particulate debris, either host cells or lysed fragments, are 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.
  • the antibody construct 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.
  • nucleic acid is well known to the skilled person and encompasses DNA (such as cDNA) and RNA (such as mRNA).
  • the nucleic acid can be double stranded and single stranded, linear and circular.
  • Said nucleic acid molecule is preferably comprised in a vector which is preferably comprised in a host cell.
  • Said host cell is, e.g. after transformation or transfection with the nucleic acid sequence of the invention, capable of expressing the antibody construct.
  • the nucleic acid molecule is operatively linked with control sequences.
  • a vector is a nucleic acid molecule used as a vehicle to transfer (foreign) genetic material into a cell.
  • vehicle encompasses—but is not restricted to—plasmids, viruses, cosmids and artificial chromosomes.
  • engineered vectors comprise an origin of replication, a multicloning site and a selectable marker.
  • the vector itself is generally a nucleotide sequence, commonly a DNA sequence, that comprises an insert (transgene) and a larger sequence that serves as the “backbone” of the vector.
  • Modern vectors may encompass additional features besides the transgene insert and a backbone: promoter, genetic marker, antibiotic resistance, reporter gene, targeting sequence, protein purification tag.
  • Vectors called expression vectors specifically are for the expression of the transgene in the target cell, and generally have control sequences such as a promoter sequence that drives expression of the transgene. Insertion of a vector into the target cell is usually called “transformation” for bacteria, “transfection” for eukaryotic cells, although insertion of a viral vector is also called “transduction”.
  • the term “host cell” is intended to refer to a cell into which a nucleic acid encoding the antibody construct of the invention is introduced by way of transformation, transfection and the like. It should be understood that such terms refer not only to the particular subject cell but to the progeny or potential progeny of such a cell. Because certain modifications may occur in succeeding generations due to either mutation or environmental influences, such progeny may not, in fact, be identical to the parent cell, but are still included within the scope of the term as used herein.
  • the term “expression” includes any step involved in the production of a antibody construct of the invention including, but not limited to, transcription, post-transcriptional modification, translation, post-translational modification, and secretion.
  • 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.
  • a 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.
  • host cell intended to include any individual cell or cell culture that can be or has/have been recipients for vectors or the incorporation of exogenous nucleic acid molecules, polynucleotides and/or proteins. It also is intended to include progeny of a single cell, and the progeny may not necessarily be completely identical (in morphology or in genomic or total DNA complement) to the original parent cell due to natural, accidental, or deliberate mutation.
  • the cells may be prokaryotic or eukaryotic, and include but are not limited to bacteria, yeast cells, animal cells, and mammalian cells, e.g., murine, rat, macaque or human.
  • Suitable host cells include prokaryotes and eukaryotic host cells including yeasts, fungi, insect cells and mammalian cells.
  • the antibody construct of the invention can be produced in bacteria. After expression, the antibody construct of the invention, preferably the antibody construct is isolated from the E. coli cell paste in a soluble fraction and can be purified through, e.g., affinity chromatography and/or size exclusion. Final purification can be carried out similar to the process for purifying antibody expressed e.g, in CHO cells.
  • eukaryotic microbes such as filamentous fungi or yeast are suitable cloning or expression hosts for the antibody construct of the invention.
  • 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 12424), K. bulgaricus (ATCC 16045), K. wickeramii (ATCC 24178), K. waltii (ATCC 56500), K.
  • drosophilarum ATCC 36906
  • 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 antibody construct of the invention 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 (fruit fly), 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, Arabidopsis and tobacco can also be utilized as hosts.
  • Cloning and expression vectors useful in the production of proteins in plant cell culture are known to those of skill in the art. See e.g. Hiatt et al., Nature (1989) 342: 76-78, Owen et al. (1992) Bio/Technology 10: 790-794, Artsaenko et al. (1995) The Plant J 8: 745-750, and Fecker et al. (1996) Plant Mol Biol 32: 979-986.
  • 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 CRL1587); 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 G2,1413 8065); mouse mammary tumor (MMT 060562, ATCC CCL5 1); TR1 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).
  • the antibody construct of the invention can be produced intracellularly, in the periplasmic space, or directly secreted into the medium. If the antibody construct is produced intracellularly, as a first step, the particulate debris, either host cells or lysed fragments, are 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 by centrifugation.
  • 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 antibody construct of the invention prepared from the host cells can be purified using, for example, hydroxylapatite chromatography, gel electrophoresis, dialysis, and affinity chromatography, with affinity chromatography being the preferred purification technique.
  • 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.
  • the antibody construct of the invention comprises a CH3 domain
  • the Bakerbond ABXMresin J. T. Baker, Phillipsburg, N.J.
  • culture refers to the in vitro maintenance, differentiation, growth, proliferation and/or propagation of cells under suitable conditions in a medium.
  • the term “pharmaceutical composition” relates to a composition for administration to a patient, preferably a human patient.
  • the particular preferred pharmaceutical composition of this invention comprises the antibody construct of the invention.
  • the pharmaceutical composition comprises suitable formulations of carriers, stabilizers and/or excipients.
  • the pharmaceutical composition comprises a composition for parenteral, transdermal, intraluminal, intraarterial, intrathecal and/or intranasal administration or by direct injection into tissue. It is in particular envisaged that said composition is administered to a patient via infusion or injection.
  • Administration of the suitable compositions may be effected by different ways, e.g., by intravenous, intraperitoneal, subcutaneous, intramuscular, topical or intradermal administration.
  • the present invention provides for an uninterrupted administration of the suitable composition.
  • uninterrupted i.e. continuous administration may be realized by a small pump system worn by the patient for metering the influx of therapeutic agent into the body of the patient.
  • the pharmaceutical composition comprising the antibody construct of the invention can be administered by using said pump systems.
  • Such pump systems are generally known in the art, and commonly rely on periodic exchange of cartridges containing the therapeutic agent to be infused.
  • a temporary interruption of the otherwise uninterrupted flow of therapeutic agent into the body of the patient may ensue.
  • the phase of administration prior to cartridge replacement and the phase of administration following cartridge replacement would still be considered within the meaning of the pharmaceutical means and methods of the invention together make up one “uninterrupted administration” of such therapeutic agent.
  • the continuous or uninterrupted administration of these antibody constructs of the invention may be intravenous or subcutaneous by way of a fluid delivery device or small pump system including a fluid driving mechanism for driving fluid out of a reservoir and an actuating mechanism for actuating the driving mechanism.
  • Pump systems for subcutaneous administration may include a needle or a cannula for penetrating the skin of a patient and delivering the suitable composition into the patient's body. Said pump systems may be directly fixed or attached to the skin of the patient independently of a vein, artery or blood vessel, thereby allowing a direct contact between the pump system and the skin of the patient.
  • the pump system can be attached to the skin of the patient for 24 hours up to several days.
  • the pump system may be of small size with a reservoir for small volumes. As a non-limiting example, the volume of the reservoir for the suitable pharmaceutical composition to be administered can be between 0.1 and 50 ml.
  • the continuous administration may be transdermal by way of a patch worn on the skin and replaced at intervals.
  • a patch worn on the skin worn on the skin and replaced at intervals.
  • patch systems for drug delivery suitable for this purpose. It is of note that transdermal administration is especially amenable to uninterrupted administration, as exchange of a first exhausted patch can advantageously be accomplished simultaneously with the placement of a new, second patch, for example on the surface of the skin immediately adjacent to the first exhausted patch and immediately prior to removal of the first exhausted patch. Issues of flow interruption or power cell failure do not arise.
  • compositions may further comprise a pharmaceutically acceptable carrier.
  • suitable pharmaceutical carriers include solutions, e.g. phosphate buffered saline solutions, water, emulsions, such as oil/water emulsions, various types of wetting agents, sterile solutions, liposomes, etc.
  • Compositions comprising such carriers can be formulated by well known conventional methods.
  • Formulations can comprise carbohydrates, buffer solutions, amino acids and/or surfactants.
  • Carbohydrates may be non-reducing sugars, preferably trehalose, sucrose, octasulfate, sorbitol or xylitol.
  • pharmaceutically acceptable carrier means any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, compatible with pharmaceutical administration.
  • solvents dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, compatible with pharmaceutical administration.
  • the use of such media and agents for pharmaceutically active substances is well known in the art.
  • Acceptable carriers, excipients, or stabilizers are nontoxic to recipients at the dosages and concentrations employed and include: additional buffering agents; preservatives; co-solvents; antioxidants, including ascorbic acid and methionine; chelating agents such as EDTA; metal complexes (e.g., Zn-protein complexes); biodegradable polymers, such as polyesters; salt-forming counter-ions, such as sodium, polyhydric sugar alcohols; amino acids, such as alanine, glycine, asparagine, 2-phenylalanine, and threonine; sugars or sugar alcohols, such as trehalose, sucrose, octasulfate, sorbitol or xylitol stachyose, mannose, sorbose, xylose, ribose, myoinisitose, galactose, lactitol, ribitol, myoinisitol, galacti
  • Such formulations may be used for continuous administrations which may be intravenuous or subcutaneous with and/or without pump systems.
  • Amino acids may be charged amino acids, preferably lysine, lysine acetate, arginine, glutamate and/or histidine.
  • Surfactants may be detergents, preferably with a molecular weight of >1.2 KD and/or a polyether, preferably with a molecular weight of >3 KD.
  • Non-limiting examples for preferred detergents are Tween 20, Tween 40, Tween 60, Tween 80 or Tween 85.
  • Non-limiting examples for preferred polyethers are PEG 3000, PEG 3350, PEG 4000 or PEG 5000.
  • Buffer systems used in the present invention can have a preferred pH of 5-9 and may comprise citrate, succinate, phosphate, histidine and acetate.
  • compositions of the present invention can be administered to the subject at a suitable dose which can be determined e.g. by dose escalating studies by administration of increasing doses of the polypeptide of the invention exhibiting cross-species specificity described herein to non-chimpanzee primates, for instance macaques.
  • the antibody construct of the invention exhibiting cross-species specificity described herein can be advantageously used in identical form in preclinical testing in non-chimpanzee primates and as drug in humans.
  • These compositions can also be administered in combination with other proteinaceous and non-proteinaceous drugs. These drugs may be administered simultaneously with the composition comprising the polypeptide of the invention as defined herein or separately before or after administration of said polypeptide in timely defined intervals and doses.
  • dosage regimen will be determined by the attending physician and clinical factors. As is well known in the medical arts, dosages for any one patient depend upon many factors, including the patient's size, body surface area, age, the particular compound to be administered, sex, time and route of administration, general health, and other drugs being administered concurrently.
  • Preparations for parenteral administration include sterile aqueous or non-aqueous solutions, suspensions, and emulsions.
  • non-aqueous solvents are propylene glycol, polyethylene glycol, vegetable oils such as olive oil, and injectable organic esters such as ethyl oleate.
  • Aqueous carriers include water, alcoholic/aqueous solutions, emulsions or suspensions, including saline and buffered media.
  • Parenteral vehicles include sodium chloride solution, Ringer's dextrose, dextrose and sodium chloride, lactated Ringer's, or fixed oils.
  • Intravenous vehicles include fluid and nutrient replenishers, electrolyte replenishers (such as those based on Ringer's dextrose), and the like. Preservatives and other additives may also be present such as, for example, antimicrobials, anti-oxidants, chelating agents, inert gases and the like.
  • the composition of the present invention might comprise proteinaceous carriers, like, e.g., serum albumin or immunoglobulin, preferably of human origin. It is envisaged that the composition of the invention might comprise, in addition to the polypeptide of the invention defined herein, further biologically active agents, depending on the intended use of the composition.
  • Such agents might be drugs acting on the gastro-intestinal system, drugs acting as cytostatica, drugs preventing hyperurikemia, drugs inhibiting immunoreactions (e.g. corticosteroids), drugs modulating the inflammatory response, drugs acting on the circulatory system and/or agents such as cytokines known in the art. It is also envisaged that the antibody construct of the present invention is applied in a co-therapy, i.e., in combination with another anti-cancer medicament.
  • the biological activity of the pharmaceutical composition defined herein can be determined for instance by cytotoxicity assays, as described in the following examples, in WO 99/54440 or by Schlereth et al. (Cancer Immunol. Immunother. 20 (2005), 1-12).
  • “Efficacy” or “in vivo efficacy” as used herein refers to the response to therapy by the pharmaceutical composition of the invention, using e.g. standardized NCI response criteria.
  • the success or in vivo efficacy of the therapy using a pharmaceutical composition of the invention refers to the effectiveness of the composition for its intended purpose, i.e. the ability of the composition to cause its desired effect, i.e. depletion of pathologic cells, e.g. tumor cells.
  • the in vivo efficacy may be monitored by established standard methods for the respective disease entities including, but not limited to white blood cell counts, differentials, Fluorescence Activated Cell Sorting, bone marrow aspiration.
  • various disease specific clinical chemistry parameters and other established standard methods may be used.
  • computer-aided tomography, X-ray, nuclear magnetic resonance tomography e.g.
  • positron-emission tomography scanning white blood cell counts, differentials, Fluorescence Activated Cell Sorting, bone marrow aspiration, lymph node biopsies/histologies, and various lymphoma specific clinical chemistry parameters (e.g. lactate dehydrogenase) and other established standard methods may be used.
  • a pharmacokinetic profile of the drug candidate i.e. a profile of the pharmacokinetic parameters that affect the ability of a particular drug to treat a given condition
  • Pharmacokinetic parameters of the drug influencing the ability of a drug for treating a certain disease entity include, but are not limited to: half-life, volume of distribution, hepatic first-pass metabolism and the degree of blood serum binding.
  • the efficacy of a given drug agent can be influenced by each of the parameters mentioned above.
  • “Half-life” means the time where 50% of an administered drug are eliminated through biological processes, e.g. metabolism, excretion, etc.
  • hepatic first-pass metabolism is meant the propensity of a drug to be metabolized upon first contact with the liver, i.e. during its first pass through the liver.
  • Volume of distribution means the degree of retention of a drug throughout the various compartments of the body, like e.g. intracellular and extracellular spaces, tissues and organs, etc. and the distribution of the drug within these compartments.
  • “Degree of blood serum binding” means the propensity of a drug to interact with and bind to blood serum proteins, such as albumin, leading to a reduction or loss of biological activity of the drug.
  • Pharmacokinetic parameters also include bioavailability, lag time (Tlag), Tmax, absorption rates, more onset and/or Cmax for a given amount of drug administered.
  • Bioavailability means the amount of a drug in the blood compartment.
  • Lag time means the time delay between the administration of the drug and its detection and measurability in blood or plasma.
  • Tmax is the time after which maximal blood concentration of the drug is reached
  • Cmax is the blood concentration maximally obtained with a given drug.
  • the time to reach a blood or tissue concentration of the drug which is required for its biological effect is influenced by all parameters.
  • Pharmacokinetic parameters of bispecific single chain antibodies exhibiting cross-species specificity which may be determined in preclinical animal testing in non-chimpanzee primates as outlined above, are also set forth e.g. in the publication by Schlereth et al. (Cancer Immunol. Immunother. 20 (2005), 1-12).
  • toxicity refers to the toxic effects of a drug manifested in adverse events or severe adverse events. These side events might refer to a lack of tolerability of the drug in general and/or a lack of local tolerance after administration. Toxicity could also include teratogenic or carcinogenic effects caused by the drug.
  • safety in vivo safety or “tolerability” as used herein defines the administration of a drug without inducing severe adverse events directly after administration (local tolerance) and during a longer period of application of the drug. “Safety”, “in vivo safety” or “tolerability” can be evaluated e.g. at regular intervals during the treatment and follow-up period. Measurements include clinical evaluation, e.g. organ manifestations, and screening of laboratory abnormalities. Clinical evaluation may be carried out and deviations to normal findings recorded/coded according to NCI-CTC and/or MedDRA standards. Organ manifestations may include criteria such as allergy/immunology, blood/bone marrow, cardiac arrhythmia, coagulation and the like, as set forth e.g.
  • CCAE Common Terminology Criteria for adverse events v3.0
  • Laboratory parameters which may be tested include for instance hematology, clinical chemistry, coagulation profile and urine analysis and examination of other body fluids such as serum, plasma, lymphoid or spinal fluid, liquor and the like.
  • Safety can thus be assessed e.g. by physical examination, imaging techniques (i.e. ultrasound, x-ray, CT scans, Magnetic Resonance Imaging (MRI), other measures with technical devices (i.e. electrocardiogram), vital signs, by measuring laboratory parameters and recording adverse events.
  • imaging techniques i.e. ultrasound, x-ray, CT scans, Magnetic Resonance Imaging (MRI), other measures with technical devices (i.e. electrocardiogram), vital signs
  • adverse events in non-chimpanzee primates in the uses and methods according to the invention may be examined by histopathological and/or histochemical methods.
  • an effective dose or “effective dosage” is defined as an amount sufficient to achieve or at least partially achieve the desired effect.
  • therapeutically effective dose is defined as an amount sufficient to cure or at least partially arrest the disease and its complications in a patient already suffering from the disease. Amounts effective for this use will depend upon the severity of the infection and the general state of the subject's own immune system.
  • patient includes human and other mammalian subjects that receive either prophylactic or therapeutic treatment.
  • effective and non-toxic dose refers to a tolerable dose of an inventive antibody construct which is high enough to cause depletion of pathologic cells, tumor elimination, tumor shrinkage or stabilization of disease without or essentially without major toxic effects.
  • effective and non-toxic doses may be determined e.g. by dose escalation studies described in the art and should be below the dose inducing severe adverse side events (dose limiting toxicity, DLT).
  • the appropriate dosage, or therapeutically effective amount, of the antibody construct of the invention will depend on the condition to be treated, the severity of the condition, prior therapy, and the patient's clinical history and response to the therapeutic agent.
  • the proper dose can be adjusted according to the judgment of the attending physician such that it can be administered to the patient one time or over a series of administrations.
  • the pharmaceutical composition can be administered as a sole therapeutic or in combination with additional therapies such as anti-cancer therapies as needed.
  • compositions of this invention are particularly useful for parenteral administration, i.e., subcutaneously, intramuscularly, intravenously, intra-articular and/or intra-synovial.
  • Parenteral administration can be by bolus injection or continuous infusion.
  • the lyophilized material is first reconstituted in an appropriate liquid prior to administration.
  • the lyophilized material may be reconstituted in, e.g., bacteriostatic water for injection (BWFI), physiological saline, phosphate buffered saline (PBS), or the same formulation the protein had been in prior to lyophilization.
  • BWFI bacteriostatic water for injection
  • PBS phosphate buffered saline
  • CDH19 expression is elevated in both primary and metastatic melanoma tumors compared to normal, untransformed tissues. Internal analysis also confirmed that expression of CDH19 in normal tissues is limited to neural crest derived peripheral nerve ganglia and nerve fibers. The differential CDH19 expression in normal and tumor tissues makes this protein attractive for cell-surface targeting therapeutics. Although CDH 19 was discussed as one marker as part of long lists of markers associated with some cancer types (see e.g. WO2009/055937) or Parkinson's disease (see e.g. WO2005/067391) CDH19 was never discussed as a prognostic marker or a drug target in connection with melanoma tumors.
  • the present invention provides an isolated multispecific antibody construct comprising a first human binding domain capable of binding to human CDH19 on the surface of a target cell and a second domain capable of binding to human CD3 on the surface of a T cell.
  • CDH19 extracellular domain refers to a form of CDH19 which is essentially free of transmembrane and cytoplasmic domains of CDH19. It will be understood by the skilled artisan that the transmembrane domain identified for the CDH19 polypeptide of the present invention is identified pursuant to criteria routinely employed in the art for identifying that type of hydrophobic domain. The exact boundaries of a transmembrane domain may vary but most likely by no more than about 5 amino acids at either end of the domain specifically mentioned herein. A preferred human CDH19 ECD is shown in SEQ ID NO: 948. In this context it is understood that the CDH19 ECD represents the part of CDH19 on the surface of a target cell.
  • the T cell CD3 receptor complex is a protein complex and is composed of four distinct chains. In mammals, the complex contains a CD3 ⁇ chain, a CD36 chain, and two CD3 ⁇ (epsilon) chains. These chains associate with a molecule known as the T cell receptor (TCR) and the ⁇ chain to generate an activation signal in T lymphocytes.
  • TCR T cell receptor
  • the redirected lysis of target cells via the recruitment of T cells by a multispecific, at least bispecific, antibody construct involves cytolytic synapse formation and delivery of perforin and granzymes.
  • the engaged T cells are capable of serial target cell lysis, and are not affected by immune escape mechanisms interfering with peptide antigen processing and presentation, or clonal T cell differentiation; see, for example, WO 2007/042261.
  • the affinity of the first binding domain for human CDH19 is preferably ⁇ 15 nM, more preferably ⁇ 10 nM, even more preferably ⁇ 5 nM, even more preferably ⁇ 1 nM, even more preferably ⁇ 0.5 nM, even more preferably ⁇ 0.1 nM, and most preferably ⁇ 0.05 nM.
  • the affinity of the first binding domain for macaque CDH19 is preferably ⁇ 15 nM, more preferably ⁇ 10 nM, even more preferably ⁇ 5 nM, even more preferably ⁇ 1 nM, even more preferably ⁇ 0.5 nM, even more preferably ⁇ 0.1 nM, and most preferably ⁇ 0.05 nM or even ⁇ 0.01 nM.
  • the affinity can be measured for example in a Biacore assay or in a Scatchard assay, e.g. as described in the Examples.
  • the affinity gap for binding to macaque CDH19 versus human CDH19 is preferably [1:10-1:5] or [5:1-10:1], more preferably [1:5-5:1], and most preferably [1:2-3:1] or even [1:1-3:1].
  • Other methods of determining the affinity are well-known to the skilled person.
  • Human antibodies respectively human antibody constructs, avoid some of the problems associated with antibodies/antibody constructs that possess murine or rat variable and/or constant regions.
  • the presence of such murine or rat derived proteins can lead to the rapid clearance of the antibodies/antibody constructs or can lead to the generation of an immune response against the antibody/antibody construct by a patient.
  • human or fully human antibodies can be generated through the introduction of human antibody function into a rodent so that the rodent produces fully human antibodies.
  • Fully human antibodies/antibody constructs are expected to minimize the immunogenic and allergic responses intrinsic to mouse or mouse-derivatized mAbs and thus to increase the efficacy and safety of the administered antibodies/antibody constructs.
  • the use of fully human antibodies/antibody constructs can be expected to provide a substantial advantage in the treatment of chronic and recurring human diseases, such as inflammation, autoimmunity, and cancer, which require repeated compound administrations.
  • the XenoMouse strains were engineered with yeast artificial chromosomes (YACs) containing 245 kb and 190 kb-sized germline configuration fragments of the human heavy chain locus and kappa light chain locus, respectively, which contained core variable and constant region sequences.
  • YACs yeast artificial chromosomes
  • the human Ig containing YACs proved to be compatible with the mouse system for both rearrangement and expression of antibodies and were capable of substituting for the inactivated mouse Ig genes. This was demonstrated by their ability to induce B-cell development, to produce an adult-like human repertoire of fully human antibodies, and to generate antigen-specific human mAbs.
  • minilocus In an alternative approach, others, including GenPharm International, Inc., have utilized a “minilocus” approach. In the minilocus approach, an exogenous Ig locus is mimicked through the inclusion of pieces (individual genes) from the Ig locus. Thus, one or more V.sub.H genes, one or more D.sub.H genes, one or more J.sub.H genes, a mu constant region, and a second constant region (preferably a gamma constant region) are formed into a construct for insertion into an animal. This approach is described in U.S. Pat. No. 5,545,807 to Surani et al. and U.S. Pat. Nos.
  • Kirin has also demonstrated the generation of human antibodies from mice in which, through microcell fusion, large pieces of chromosomes, or entire chromosomes, have been introduced. See European Patent Application Nos. 773 288 and 843 961, the disclosures of which are hereby incorporated by reference.Xenerex Biosciences is developing a technology for the potential generation of human antibodies. In this technology, SCID mice are reconstituted with human lymphatic cells, e.g., B and/or T cells. Mice are then immunized with an antigen and can generate an immune response against the antigen. See U.S. Pat. Nos. 5,476,996, 5,698,767, and 5,958,765.
  • HAMA Human anti-mouse antibody
  • HACA human anti-chimeric antibody
  • Cytotoxicity mediated by CDH19/CD3 bispecific antibody constructs can be measured in various ways.
  • Effector cells can be e.g. stimulated enriched (human) CD8 positive T cells or unstimulated (human) peripheral blood mononuclear cells (PBMC). If the target cells are of macaque origin or express or are transfected with macaque CDH19, the effector cells should also be of macaque origin such as a macaque T cell line, e.g. 4119LnPx. The target cells should express (at least the extracellular domain of) CDH19, e.g. human or macaque CDH19.
  • PBMC peripheral blood mononuclear cells
  • Target cells can be a cell line (such as CHO) which is stably or transiently transfected with CDH19, e.g. human or macaque CDH19.
  • the target cells can be a CDH19 positive natural expresser cell line, such as the human myeloma cell line CHL-1 or Colo-699.
  • CDH19 positive natural expresser cell line such as the human myeloma cell line CHL-1 or Colo-699.
  • E:T effector to target cell
  • Cytotoxic activity of CDH19/CD3 bispecific antibody constructs can be measured in an 51-chromium release assay (incubation time of about 18 hours) or in a in a FACS-based cytotoxicity assay (incubation time of about 48 hours). Modifications of the assay incubation time (cytotoxic reaction) are also possible.
  • Other methods of measuring cytotoxicity are well-known to the skilled person and comprise MTT or MTS assays, ATP-based assays including bioluminescent assays, the sulforhodamine B (SRB) assay, WST assay, clonogenic assay and the ECIS technology.
  • the cytotoxic activity mediated by CDH19/CD3 bispecific antibody constructs of the present invention is preferably measured in a cell-based cytotoxicity assay. It is represented by the EC 50 value, which corresponds to the half maximal effective concentration (concentration of the antibody construct which induces a cytotoxic response halfway between the baseline and maximum).
  • the EC 50 value of the CDH19/CD3 bispecific antibody constructs is ⁇ 20.000 ⁇ g/ml, more preferably ⁇ 5000 ⁇ g/ml, even more preferably ⁇ 1000 ⁇ g/ml, even more preferably ⁇ 500 ⁇ g/ml, even more preferably ⁇ 350 ⁇ g/ml, even more preferably ⁇ 320 ⁇ g/ml, even more preferably ⁇ 250 ⁇ g/ml, even more preferably ⁇ 100 ⁇ g/ml, even more preferably ⁇ 50 ⁇ g/ml, even more preferably ⁇ 10 ⁇ g/ml, and most preferably ⁇ 5 ⁇ g/ml.
  • the EC 50 value of the CDH19/CD3 bispecific antibody construct is preferably ⁇ 1000 ⁇ g/ml, more preferably ⁇ 500 ⁇ g/ml, even more preferably ⁇ 250 ⁇ g/ml, even more preferably ⁇ 100 ⁇ g/ml, even more preferably ⁇ 50 ⁇ g/ml, even more preferably ⁇ 10 ⁇ g/ml, and most preferably ⁇ 5 ⁇ g/ml.
  • the target cells are (human or macaque) CDH19 transfected cells such as CHO cells
  • the EC 50 value of the CDH19/CD3 bispecific antibody construct is preferably ⁇ 150 ⁇ g/ml, more preferably ⁇ 100 ⁇ g/ml, even more preferably ⁇ 50 ⁇ g/ml, even more preferably ⁇ 30 ⁇ g/ml, even more preferably ⁇ 10 ⁇ g/ml, and most preferably ⁇ 5 ⁇ g/ml.
  • the EC 50 value is preferably ⁇ 350 ⁇ g/ml, more preferably ⁇ 320 ⁇ g/ml, even more preferably ⁇ 250 ⁇ g/ml, even more preferably ⁇ 200 ⁇ g/ml, even more preferably ⁇ 100 ⁇ g/ml, even more preferably 150 ⁇ g/ml, even more preferably ⁇ 100 ⁇ g/ml, and most preferably ⁇ 50 ⁇ g/ml, or lower.
  • the EC 50 value of the CDH19/CD3 bispecific antibody construct is preferably ⁇ 1000 ⁇ g/ml, more preferably ⁇ 750 ⁇ g/ml, more preferably ⁇ 500 ⁇ g/ml, even more preferably ⁇ 350 ⁇ g/ml, even more preferably ⁇ 320 ⁇ g/ml, even more preferably ⁇ 250 ⁇ g/ml, even more preferably ⁇ 100 ⁇ g/ml, and most preferably ⁇ 50 ⁇ g/ml, or lower.
  • Potency gap The difference in cytotoxic activity between the monomeric and the dimeric isoform of individual CDH19/CD3 bispecific antibody constructs is referred to as “potency gap”.
  • This potency gap can e.g. be calculated as ratio between EC 50 values of the molecule's monomeric and dimeric form.
  • Potency gaps of the CDH19/CD3 bispecific antibody constructs of the present invention are preferably ⁇ 5, more preferably ⁇ 4, even more preferably ⁇ 3, even more preferably ⁇ 2 and most preferably ⁇ 1.
  • the antibody construct of the invention is a fusion protein comprising at least two binding domains, with or without peptide linkers (spacer peptides).
  • suitable peptide linkers are those described in U.S. Pat. Nos. 4,751,180 and 4,935,233 or WO 88/09344.
  • Another method for preparing oligomeric antibody constuct derivatives involves use of a leucine zipper.
  • Leucine zipper domains are peptides that promote oligomerization of the proteins in which they are found. Leucine zippers were originally identified in several DNA-binding proteins (Landschulz et al., 1988, Science 240:1759), and have since been found in a variety of different proteins.
  • leucine zippers are naturally occurring peptides and derivatives thereof that dimerize or trimerize.
  • leucine zipper domains suitable for producing soluble oligomeric proteins are described in PCT application WO 94/10308, and the leucine zipper derived from lung surfactant protein D (SPD) described in Hoppe et al., 1994, FEBS Letters 344:191, hereby incorporated by reference.
  • SPD lung surfactant protein D
  • the use of a modified leucine zipper that allows for stable trimerization of a heterologous protein fused thereto is described in Fanslow et al., 1994, Semin. Immunol. 6:267-78.
  • recombinant fusion proteins comprising CDH19 antibody fragment or derivative fused to a leucine zipper peptide are expressed in suitable host cells, and the soluble oligomeric CDH19 antibody fragments or derivatives that form are recovered from the culture supernatant.
  • Covalent modifications of antigen binding proteins are included within the scope of this invention, and are generally, but not always, done post-translationally.
  • several types of covalent modifications of the antigen binding protein are introduced into the molecule by reacting specific amino acid residues of the antigen binding protein with an organic derivatizing agent that is capable of reacting with selected side chains or the N- or C-terminal residues.
  • Cysteinyl residues most commonly are reacted with ⁇ -haloacetates (and corresponding amines), such as chloroacetic acid or chloroacetamide, to give carboxymethyl or carboxyamidomethyl derivatives. Cysteinyl residues also are derivatized by reaction with bromotrifluoroacetone, ⁇ -bromo- ⁇ -(5-imidozoyl)propionic acid, chloroacetyl phosphate, N-alkylmaleimides, 3-nitro-2-pyridyl disulfide, methyl 2-pyridyl disulfide, p-chloromercuribenzoate, 2-chloromercuri-4-nitrophenol, or chloro-7-nitrobenzo-2-oxa-1,3-diazole.
  • Histidyl residues are derivatized by reaction with diethylpyrocarbonate at pH 5.5-7.0 because this agent is relatively specific for the histidyl side chain.
  • Para-bromophenacyl bromide also is useful; the reaction is preferably performed in 0.1 M sodium cacodylate at pH 6.0.
  • Lysinyl and amino terminal residues are reacted with succinic or other carboxylic acid anhydrides. Derivatization with these agents has the effect of reversing the charge of the lysinyl residues.
  • Other suitable reagents for derivatizing alpha-amino-containing residues include imidoesters such as methyl picolinimidate; pyridoxal phosphate; pyridoxal; chloroborohydride; trinitrobenzenesulfonic acid; O-methylisourea; 2,4-pentanedione; and transaminase-catalyzed reaction with glyoxylate.
  • Arginyl residues are modified by reaction with one or several conventional reagents, among them phenylglyoxal, 2,3-butanedione, 1,2-cyclohexanedione, and ninhydrin. Derivatization of arginine residues requires that the reaction be performed in alkaline conditions because of the high pKa of the guanidine functional group. Furthermore, these reagents may react with the groups of lysine as well as the arginine epsilon-amino group.
  • tyrosyl residues may be made, with particular interest in introducing spectral labels into tyrosyl residues by reaction with aromatic diazonium compounds or tetranitromethane.
  • aromatic diazonium compounds or tetranitromethane Most commonly, N-acetylimidizole and tetranitromethane are used to form O-acetyl tyrosyl species and 3-nitro derivatives, respectively.
  • Tyrosyl residues are iodinated using 125 I or 131 I to prepare labeled proteins for use in radioimmunoassay, the chloramine T method described above being suitable.
  • Carboxyl side groups are selectively modified by reaction with carbodiimides (R′—N—N ⁇ C ⁇ N—R′), where R and R′ are optionally different alkyl groups, such as 1-cyclohexyl-3-(2-morpholinyl-4-ethyl)carbodiimide or 1-ethyl-3-(4-azonia-4,4-dimethylpentyl)carbodiimide.
  • R′ are optionally different alkyl groups, such as 1-cyclohexyl-3-(2-morpholinyl-4-ethyl)carbodiimide or 1-ethyl-3-(4-azonia-4,4-dimethylpentyl)carbodiimide.
  • aspartyl and glutamyl residues are converted to asparaginyl and glutaminyl residues by reaction with ammonium ions.
  • Derivatization with bifunctional agents is useful for crosslinking antigen binding proteins to a water-insoluble support matrix or surface for use in a variety of methods.
  • Commonly used crosslinking agents include, e.g., 1,1-bis(diazoacetyl)-2-phenylethane, glutaraldehyde, N-hydroxysuccinimide esters, for example, esters with 4-azidosalicylic acid, homobifunctional imidoesters, including disuccinimidyl esters such as 3,3′-dithiobis(succinimidylpropionate), and bifunctional maleimides such as bis-N-maleimido-1,8-octane.
  • Derivatizing agents such as methyl-3-[(p-azidophenyl)dithio]propioimidate yield photoactivatable intermediates that are capable of forming crosslinks in the presence of light.
  • reactive water-insoluble matrices such as cyanogen bromide-activated carbohydrates and the reactive substrates described in U.S. Pat. Nos. 3,969,287; 3,691,016; 4,195,128; 4,247,642; 4,229,537; and 4,330,440 are employed for protein immobilization.
  • Glutaminyl and asparaginyl residues are frequently deamidated to the corresponding glutamyl and aspartyl residues, respectively. Alternatively, these residues are deamidated under mildly acidic conditions. Either form of these residues falls within the scope of this invention.
  • glycosylation patterns can depend on both the sequence of the protein (e.g., the presence or absence of particular glycosylation amino acid residues, discussed below), or the host cell or organism in which the protein is produced. Particular expression systems are discussed below.
  • N-linked refers to the attachment of the carbohydrate moiety to the side chain of an asparagine residue.
  • the tri-peptide 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-acetylgalactosamine, 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 antigen binding protein is conveniently accomplished by altering the amino acid sequence such that it contains one or more of the above-described tri-peptide 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 starting sequence (for O-linked glycosylation sites).
  • the antigen binding protein amino acid sequence is preferably altered through changes at the DNA level, particularly by mutating the DNA encoding the target polypeptide at preselected bases such that codons are generated that will translate into the desired amino acids.
  • Another means of increasing the number of carbohydrate moieties on the antigen binding protein is by chemical or enzymatic coupling of glycosides to the protein. These procedures are advantageous in that they do not require production of the protein in a host cell that has glycosylation capabilities for N- and O-linked glycosylation.
  • the sugar(s) may be attached to (a) arginine and histidine, (b) free carboxyl groups, (c) free sulfhydryl groups such as those of cysteine, (d) free hydroxyl groups such as those of serine, threonine, or hydroxyproline, (e) aromatic residues such as those of phenylalanine, tyrosine, or tryptophan, or (f) the amide group of glutamine.
  • Removal of carbohydrate moieties present on the starting antigen binding protein may be accomplished chemically or enzymatically.
  • Chemical deglycosylation requires exposure of the protein to the compound trifluoromethanesulfonic acid, or an equivalent compound. This treatment results in the cleavage of most or all sugars except the linking sugar (N-acetylglucosamine or N-acetylgalactosamine), while leaving the polypeptide intact.
  • Chemical deglycosylation is described by Hakimuddin et al., 1987 , Arch. Biochem. Biophys. 259:52 and by Edge et al., 1981 , Anal. Biochem. 118:131.
  • Enzymatic cleavage of carbohydrate moieties on polypeptides can be achieved by the use of a variety of endo- and exo-glycosidases as described by Thotakura et al., 1987 , Meth. Enzymol. 138:350. Glycosylation at potential glycosylation sites may be prevented by the use of the compound tunicamycin as described by Duskin et al., 1982 , J. Biol. Chem. 257:3105. Tunicamycin blocks the formation of protein-N-glycoside linkages.
  • Another type of covalent modification of the antigen binding protein comprises linking the antigen binding protein to various non-proteinaceous polymers, including, but not limited to, various polyols such as polyethylene glycol, polypropylene glycol or polyoxyalkylenes, in the manner set forth in U.S. Pat. No. 4,640,835; 4,496,689; 4,301,144; 4,670,417; 4,791,192 or 4,179,337.
  • amino acid substitutions may be made in various positions within the antigen binding protein to facilitate the addition of polymers such as PEG.
  • the covalent modification of the antigen binding proteins of the invention comprises the addition of one or more labels.
  • labelling group means any detectable label.
  • suitable labelling groups include, but are not limited to, the following: radioisotopes or radionuclides (e.g., 3 H, 14 C, 15 N, 35 S, 90 Y, 99 Tc, 111 In, 125 I, 131 I), fluorescent groups (e.g., FITC, rhodamine, lanthanide phosphors), enzymatic groups (e.g., horseradish peroxidase, ⁇ -galactosidase, luciferase, alkaline phosphatase), chemiluminescent groups, biotinyl groups, or predetermined polypeptide epitopes recognized by a secondary reporter (e.g., leucine zipper pair sequences, binding sites for secondary antibodies, metal binding domains, epitope tags).
  • the labelling group is coupled to the antigen binding protein via spacer arms of various lengths to reduce potential steric hindrance.
  • labels fall into a variety of classes, depending on the assay in which they are to be detected: a) isotopic labels, which may be radioactive or heavy isotopes; b) magnetic labels (e.g., magnetic particles); c) redox active moieties; d) optical dyes; enzymatic groups (e.g. horseradish peroxidase, ⁇ -galactosidase, luciferase, alkaline phosphatase); e) biotinylated groups; and f) predetermined polypeptide epitopes recognized by a secondary reporter (e.g., leucine zipper pair sequences, binding sites for secondary antibodies, metal binding domains, epitope tags, etc.).
  • the labelling group is coupled to the antigen binding protein via spacer arms of various lengths to reduce potential steric hindrance.
  • spacer arms of various lengths to reduce potential steric hindrance.
  • optical dyes including, but not limited to, chromophores, phosphors and fluorophores, with the latter being specific in many instances.
  • Fluorophores can be either “small molecule” fluores, or proteinaceous fluores.
  • fluorescent label any molecule that may be detected via its inherent fluorescent properties. Suitable fluorescent labels include, but are not limited to, fluorescein, rhodamine, tetramethylrhodamine, eosin, erythrosin, coumarin, methyl-coumarins, pyrene, Malacite green, stilbene, Lucifer Yellow, Cascade BlueJ, Texas Red, IAEDANS, EDANS, BODIPY FL, LC Red 640, Cy 5, Cy 5.5, LC Red 705, Oregon green, the Alexa-Fluor dyes (Alexa Fluor 350, Alexa Fluor 430, Alexa Fluor 488, Alexa Fluor 546, Alexa Fluor 568, Alexa Fluor 594, Alexa Fluor 633, Alexa Fluor 660, Alexa Fluor 680), Cascade Blue, Cascade Yellow and R-phycoerythrin (PE) (Molecular Probes, Eugene, Oreg.), FITC, Rhod
  • Suitable proteinaceous fluorescent labels also include, but are not limited to, green fluorescent protein, including a Renilla, Ptilosarcus , or Aequorea species of GFP (Chalfie et al., 1994 , Science 263:802-805), EGFP (Clontech Laboratories, Inc., Genbank Accession Number U55762), blue fluorescent protein (BFP, Quantum Biotechnologies, Inc. 1801 de Maisonneuve Blvd. West, 8th Floor, Montreal, Quebec, Canada H3H 1J9; Stauber, 1998 , Biotechniques 24:462-471; Heim et al., 1996 , Curr. Biol.
  • green fluorescent protein including a Renilla, Ptilosarcus , or Aequorea species of GFP (Chalfie et al., 1994 , Science 263:802-805), EGFP (Clontech Laboratories, Inc., Genbank Accession Number U55762), blue fluorescent protein (BFP, Quantum Biotechnologies, Inc.
  • EYFP enhanced yellow fluorescent protein
  • luciferase Rhoplasminogen activatories, Inc.
  • ⁇ galactosidase Nolan et al., 1988 , Proc. Natl. Acad. Sci. U.S.A. 85:2603-2607
  • Renilla WO92/15673, WO95/07463, WO98/14605, WO98/26277, WO99/49019, U.S. Pat. Nos.
  • the antibody construct of the invention may also comprise additional domains, which e.g. are helpful in the isolation of the molecule or relate to an adapted pharmacokinetic profile of the molecule.
  • Domains helpful for the isolation of an antibody construct may be elected from peptide motives or secondarily introduced moieties, which can be captured in an isolation method, e.g. an isolation column.
  • additional domains comprise peptide motives known as Myc-tag, HAT-tag, HA-tag, TAP-tag, GST-tag, chitin binding domain (CBD-tag), maltose binding protein (MBP-tag), Flag-tag, Strep-tag and variants thereof (e.g. StrepII-tag) and His-tag.
  • All herein disclosed antibody constructs characterized by the identified CDRs are preferred to comprise a His-tag domain, which is generally known as a repeat of consecutive His residues in the amino acid sequence of a molecule, preferably of six His residues.
  • the antibody construct of the invention comprises a VH region comprising CDR-H1, CDR-H2 and CDR-H3 and a VL region comprising CDR-L1, CDR-L2 and CDR-L3 selected from the group consisting of:
  • the invention further provides an embodiment of the antibody construct of the invention, wherein the first binding domain comprises a VH region and a VL region selected from the group consisting of:
  • the antibody construct is in a format selected from the group consisting of (scFv) 2 , (single domain mAb) 2 , scFv-single domain mAb, diabodies and oligomers thereof.
  • the second binding domain is capable of binding to human CD3 and to macaque CD3, preferably to human CD3 epsilon and to macaque CD3 epsilon. Additionally or alternatively, the second binding domain is capable of binding to Callithrix jacchus, Saguinus oedipus and/or Saimiri sciureus CD3 epsilon.
  • one or both binding domains of the antibody construct of the invention are preferably cross-species specific for members of the mammalian order of primates. Cross-species specific CD3 binding domains are, for example, described in WO 2008/119567.
  • the second binding domain capable of binding to the T cell CD3 receptor complex comprises a VL region comprising CDR-L1, CDR-L2 and CDR-L3 selected from:
  • the second binding domain capable of binding to the T cell CD3 receptor complex comprises a VH region comprising CDR-H 1, CDR-H2 and CDR-H3 selected from:
  • the second binding domain capable of binding to the T cell CD3 receptor complex comprises a VL region selected from the group consisting of a VL region as depicted in SEQ ID NO: 35, 39, 125, 129, 161 or 165 of WO 2008/119567.
  • the second binding domain capable of binding to the T cell CD3 receptor complex comprises a VH region selected from the group consisting of a VH region as depicted in SEQ ID NO: 15, 19, 33, 37, 51, 55, 69, 73, 87, 91, 105, 109, 123, 127, 141, 145, 159, 163, 177 or 181 of WO 2008/119567.
  • the antibody construct of the present invention is characterized by the second binding domain capable of binding to the T cell CD3 receptor complex comprising a VL region and a VH region selected from the group consisting of:
  • the pairs of VH-regions and VL-regions are in the format of a single chain antibody (scFv).
  • the VH and VL regions are arranged in the order VH-VL or VL-VH. It is preferred that the VH-region is positioned N-terminally to a linker sequence.
  • the VL-region is positioned C-terminally of the linker sequence.
  • a preferred embodiment of the above described antibody construct of the present invention is characterized by the second binding domain capable of binding to the T cell CD3 receptor complex comprising an amino acid sequence selected from the group consisting of SEQ ID NOs: 23, 25, 41, 43, 59, 61, 77, 79, 95, 97, 113, 115, 131, 133, 149, 151, 167, 169, 185 or 187 of WO 2008/119567.
  • the invention further provides a nucleic acid sequence encoding an antibody construct of the invention.
  • the invention provides a vector comprising a nucleic acid sequence of the invention. Moreover, the invention provides a host cell transformed or transfected with the nucleic acid sequence of the invention.
  • the invention provides a process for the production of a antibody construct of the invention, said process comprising culturing a host cell of the invention under conditions allowing the expression of the antibody construct of the invention and recovering the produced antibody construct from the culture.
  • the invention provides a pharmaceutical composition comprising an antibody construct of the invention or produced according to the process of the invention
  • treatment refers to both therapeutic treatment and prophylactic or preventative measures.
  • Treatment includes the application or administration of the formulation to the body, an isolated tissue, or cell from a patient who has a disease/disorder, a symptom of a disease/disorder, or a predisposition toward a disease/disorder, with the purpose to cure, heal, alleviate, relieve, alter, remedy, ameliorate, improve, or affect the disease, the symptom of the disease, or the predisposition toward the disease.
  • Those “in need of treatment” include those already with the disorder, as well as those in which the disorder is to be prevented.
  • the term “disease” is any condition that would benefit from treatment with the protein formulation described herein. This includes chronic and acute disorders or diseases including those pathological conditions that predispose the mammal to the disease in question.
  • diseases/disorders to be treated herein include proliferative disease, a tumorous disease, or an immunological disorder.
  • the invention provides a pharmaceutical composition comprising a therapeutically effective amount of one or a plurality of the antibody construct of the invention together with a pharmaceutically effective diluents, carrier, solubilizer, emulsifier, preservative, and/or adjuvant.
  • Pharmaceutical compositions of the invention include, but are not limited to, liquid, frozen, and lyophilized compositions.
  • formulation materials are nontoxic to recipients at the dosages and concentrations employed.
  • pharmaceutical compositions comprising a therapeutically effective amount of an antibody construct of the invention.
  • the pharmaceutical composition may contain formulation materials for modifying, maintaining or preserving, for example, the pH, osmolarity, viscosity, clarity, color, isotonicity, odor, sterility, stability, rate of dissolution or release, adsorption or penetration of the composition.
  • formulation materials for modifying, maintaining or preserving for example, the pH, osmolarity, viscosity, clarity, color, isotonicity, odor, sterility, stability, rate of dissolution or release, adsorption or penetration of the composition.
  • suitable formulation materials include, but are not limited to, amino acids (such as glycine, glutamine, asparagine, arginine, proline, or lysine); antimicrobials; antioxidants (such as ascorbic acid, sodium sulfite or sodium hydrogen-sulfite); buffers (such as borate, bicarbonate, Tris-HCl, citrates, phosphates or other organic acids); bulking agents (such as mannitol or glycine); chelating agents (such as ethylenediamine tetraacetic acid (EDTA)); complexing agents (such as caffeine, polyvinylpyrrolidone, beta-cyclodextrin or hydroxypropyl-beta-cyclodextrin); fillers; monosaccharides; disaccharides; and other carbohydrates (such as glucose, mannose or dextrins); proteins (such as serum albumin, gelatin or immunoglobulins); coloring, flavoring and diluting agents; emuls, g
  • the optimal pharmaceutical composition will be determined by one skilled in the art depending upon, for example, the intended route of administration, delivery format and desired dosage. See, for example, REMINGTON′S PHARMACEUTICAL SCIENCES, supra. In certain embodiments, such compositions may influence the physical state, stability, rate of in vivo release and rate of in vivo clearance of the antigen binding proteins of the invention.
  • the primary vehicle or carrier in a pharmaceutical composition may be either aqueous or non-aqueous in nature.
  • a suitable vehicle or carrier may be water for injection, physiological saline solution or artificial cerebrospinal fluid, possibly supplemented with other materials common in compositions for parenteral administration.
  • Neutral buffered saline or saline mixed with serum albumin are further exemplary vehicles.
  • pharmaceutical compositions comprise Tris buffer of about pH 7.0-8.5, or acetate buffer of about pH 4.0-5.5, and may further include sorbitol or a suitable substitute therefore.
  • human antibody or antigen binding fragment thereof of the invention or the antibody construct of the invention compositions may be prepared for storage by mixing the selected composition having the desired degree of purity with optional formulation agents (REMINGTON′S PHARMACEUTICAL SCIENCES, supra) in the form of a lyophilized cake or an aqueous solution.
  • the human antibody or antigen binding fragment thereof of the invention or the antibody construct of the invention may be formulated as a lyophilizate using appropriate excipients such as sucrose.
  • compositions of the invention can be selected for parenteral delivery. Alternatively, the compositions may be selected for inhalation or for delivery through the digestive tract, such as orally. Preparation of such pharmaceutically acceptable compositions is within the skill of the art.
  • the formulation components are present preferably in concentrations that are acceptable to the site of administration. In certain embodiments, buffers are used to maintain the composition at physiological pH or at a slightly lower pH, typically within a pH range of from about 5 to about 8.
  • the therapeutic compositions for use in this invention may be provided in the form of a pyrogen-free, parenterally acceptable aqueous solution comprising the desired human antibody or antigen binding fragment thereof of the invention or the antibody construct of the invention in a pharmaceutically acceptable vehicle.
  • a particularly suitable vehicle for parenteral injection is sterile distilled water in which the antibody construct of the invention is formulated as a sterile, isotonic solution, properly preserved.
  • the preparation can involve the formulation of the desired molecule with an agent, such as injectable microspheres, bio-erodible particles, polymeric compounds (such as polylactic acid or polyglycolic acid), beads or liposomes, that may provide controlled or sustained release of the product which can be delivered via depot injection.
  • an agent such as injectable microspheres, bio-erodible particles, polymeric compounds (such as polylactic acid or polyglycolic acid), beads or liposomes, that may provide controlled or sustained release of the product which can be delivered via depot injection.
  • hyaluronic acid may also be used, having the effect of promoting sustained duration in the circulation.
  • implantable drug delivery devices may be used to introduce the desired antigen binding protein.
  • sustained- or controlled-delivery formulations include formulations involving h the antibody construct of the invention in sustained- or controlled-delivery formulations.
  • Techniques for formulating a variety of other sustained- or controlled-delivery means such as liposome carriers, bio-erodible microparticles or porous beads and depot injections, are also known to those skilled in the art. See, for example, International Patent Application No. PCT/US93/00829, which is incorporated by reference and describes controlled release of porous polymeric microparticles for delivery of pharmaceutical compositions.
  • Sustained-release preparations may include semipermeable polymer matrices in the form of shaped articles, e.g., films, or microcapsules.
  • Sustained release matrices may include polyesters, hydrogels, polylactides (as disclosed in U.S. Pat. No. 3,773,919 and European Patent Application Publication No. EP 058481, each of which is incorporated by reference), copolymers of L-glutamic acid and gamma ethyl-L-glutamate (Sidman et al., 1983, Biopolymers 2:547-556), poly (2-hydroxyethyl-methacrylate) (Langer et al., 1981, J. Biomed. Mater. Res. 15:167-277 and Langer, 1982, Chem. Tech.
  • Sustained release compositions may also include liposomes that can be prepared by any of several methods known in the art. See, e.g., Eppstein et al., 1985, Proc. Natl. Acad. Sci. U.S.A. 82:3688-3692; European Patent Application Publication Nos. EP 036,676; EP 088,046 and EP 143,949, incorporated by reference.
  • compositions used for in vivo administration are typically provided as sterile preparations. Sterilization can be accomplished by filtration through sterile filtration membranes. When the composition is lyophilized, sterilization using this method may be conducted either prior to or following lyophilization and reconstitution.
  • Compositions for parenteral administration can be stored in lyophilized form or in a solution. Parenteral compositions generally are placed into a container having a sterile access port, for example, an intravenous solution bag or vial having a stopper pierceable by a hypodermic injection needle.
  • aspects of the invention includes self-buffering antibody construct of the invention formulations, which can be used as pharmaceutical compositions, as described in international patent application WO 06138181A2 (PCT/US2006/022599), which is incorporated by reference in its entirety herein.
  • certain embodiments provide antibody construct of the invention protein compositions, particularly pharmaceutical compositions of the invention, that comprise, in addition to the antibody construct of the invention, one or more excipients such as those illustratively described in this section and elsewhere herein.
  • Excipients can be used in the invention in this regard for a wide variety of purposes, such as adjusting physical, chemical, or biological properties of formulations, such as adjustment of viscosity, and or processes of the invention to improve effectiveness and or to stabilize such formulations and processes against degradation and spoilage due to, for instance, stresses that occur during manufacturing, shipping, storage, pre-use preparation, administration, and thereafter.
  • Salts may be used in accordance with certain embodiments of the invention to, for example, adjust the ionic strength and/or the isotonicity of a formulation and/or to improve the solubility and/or physical stability of a protein or other ingredient of a composition in accordance with the invention.
  • ions can stabilize the native state of proteins by binding to charged residues on the protein's surface and by shielding charged and polar groups in the protein and reducing the strength of their electrostatic interactions, attractive, and repulsive interactions. Ions also can stabilize the denatured state of a protein by binding to, in particular, the denatured peptide linkages (—CONH) of the protein. Furthermore, ionic interaction with charged and polar groups in a protein also can reduce intermolecular electrostatic interactions and, thereby, prevent or reduce protein aggregation and insolubility.
  • Ionic species differ significantly in their effects on proteins.
  • a number of categorical rankings of ions and their effects on proteins have been developed that can be used in formulating pharmaceutical compositions in accordance with the invention.
  • One example is the Hofineister series, which ranks ionic and polar non-ionic solutes by their effect on the conformational stability of proteins in solution.
  • Stabilizing solutes are referred to as “kosmotropic.”
  • Destabilizing solutes are referred to as “chaotropic.”
  • Kosmotropes commonly are used at high concentrations (e.g., >1 molar ammonium sulfate) to precipitate proteins from solution (“salting-out”).
  • Chaotropes commonly are used to denture and/or to solubilize proteins (“salting-in”). The relative effectiveness of ions to “salt-in” and “salt-out” defines their position in the Hofineister series.
  • Free amino acids can be used in the antibody construct of the invention formulations in accordance with various embodiments of the invention as bulking agents, stabilizers, and antioxidants, as well as other standard uses. Lysine, proline, serine, and alanine can be used for stabilizing proteins in a formulation. Glycine is useful in lyophilization to ensure correct cake structure and properties. Arginine may be useful to inhibit protein aggregation, in both liquid and lyophilized formulations. Methionine is useful as an antioxidant.
  • Polyols include sugars, e.g., mannitol, sucrose, and sorbitol and polyhydric alcohols such as, for instance, glycerol and propylene glycol, and, for purposes of discussion herein, polyethylene glycol (PEG) and related substances.
  • Sugars e.g., mannitol, sucrose, and sorbitol and polyhydric alcohols such as, for instance, glycerol and propylene glycol, and, for purposes of discussion herein, polyethylene glycol (PEG) and related substances.
  • Polyols are kosmotropic. They are useful stabilizing agents in both liquid and lyophilized formulations to protect proteins from physical and chemical degradation processes. Polyols also are useful for adjusting the tonicity of formulations.
  • polyols useful in select embodiments of the invention is mannitol, commonly used to ensure structural stability of the cake in lyophilized formulations. It ensures structural stability to the cake. It is generally used with a lyoprotectant, e.g., sucrose. Sorbitol and sucrose are among preferred agents for adjusting tonicity and as stabilizers to protect against freeze-thaw stresses during transport or the preparation of bulks during the manufacturing process. Reducing sugars (which contain free aldehyde or ketone groups), such as glucose and lactose, can glycate surface lysine and arginine residues. Therefore, they generally are not among preferred polyols for use in accordance with the invention.
  • a lyoprotectant e.g., sucrose.
  • Sorbitol and sucrose are among preferred agents for adjusting tonicity and as stabilizers to protect against freeze-thaw stresses during transport or the preparation of bulks during the manufacturing process.
  • Reducing sugars which contain
  • sugars that form such reactive species such as sucrose, which is hydrolyzed to fructose and glucose under acidic conditions, and consequently engenders glycation, also is not among preferred polyols of the invention in this regard.
  • PEG is useful to stabilize proteins and as a cryoprotectant and can be used in the invention in this regard.
  • Embodiments of the antibody construct of the invention formulations further comprise surfactants.
  • Protein molecules may be susceptible to adsorption on surfaces and to denaturation and consequent aggregation at air-liquid, solid-liquid, and liquid-liquid interfaces. These effects generally scale inversely with protein concentration. These deleterious interactions generally scale inversely with protein concentration and typically are exacerbated by physical agitation, such as that generated during the shipping and handling of a product.
  • surfactants routinely are used to prevent, minimize, or reduce surface adsorption.
  • Useful surfactants in the invention in this regard include polysorbate 20, polysorbate 80, other fatty acid esters of sorbitan polyethoxylates, and poloxamer 188.
  • surfactants also are commonly used to control protein conformational stability.
  • the use of surfactants in this regard is protein-specific since, any given surfactant typically will stabilize some proteins and destabilize others.
  • Polysorbates are susceptible to oxidative degradation and often, as supplied, contain sufficient quantities of peroxides to cause oxidation of protein residue side-chains, especially methionine. Consequently, polysorbates should be used carefully, and when used, should be employed at their lowest effective concentration. In this regard, polysorbates exemplify the general rule that excipients should be used in their lowest effective concentrations.
  • Embodiments of the antibody construct of the invention formulations further comprise one or more antioxidants.
  • antioxidants To some extent deleterious oxidation of proteins can be prevented in pharmaceutical formulations by maintaining proper levels of ambient oxygen and temperature and by avoiding exposure to light.
  • Antioxidant excipients can be used as well to prevent oxidative degradation of proteins.
  • useful antioxidants in this regard are reducing agents, oxygen/free-radical scavengers, and chelating agents.
  • Antioxidants for use in therapeutic protein formulations in accordance with the invention preferably are water-soluble and maintain their activity throughout the shelf life of a product.
  • EDTA is a preferred antioxidant in accordance with the invention in this regard.
  • Antioxidants can damage proteins.
  • reducing agents such as glutathione in particular, can disrupt intramolecular disulfide linkages.
  • antioxidants for use in the invention are selected to, among other things, eliminate or sufficiently reduce the possibility of themselves damaging proteins in the formulation.
  • Formulations in accordance with the invention may include metal ions that are protein co-factors and that are necessary to form protein coordination complexes, such as zinc necessary to form certain insulin suspensions. Metal ions also can inhibit some processes that degrade proteins. However, metal ions also catalyze physical and chemical processes that degrade proteins.
  • Magnesium ions (10-120 mM) can be used to inhibit isomerization of aspartic acid to isoaspartic acid.
  • Ca+2 ions (up to 100 mM) can increase the stability of human deoxyribonuclease. Mg+2, Mn+2, and Zn+2, however, can destabilize rhDNase.
  • Ca+2 and Sr+2 can stabilize Factor VIII, it can be destabilized by Mg+2, Mn+2 and Zn+2, Cu+2 and Fe+2, and its aggregation can be increased by Al+3 ions.
  • Embodiments of the antibody construct of the invention formulations further comprise one or more preservatives.
  • Preservatives are necessary when developing multi-dose parenteral formulations that involve more than one extraction from the same container. Their primary function is to inhibit microbial growth and ensure product sterility throughout the shelf-life or term of use of the drug product. Commonly used preservatives include benzyl alcohol, phenol and m-cresol. Although preservatives have a long history of use with small-molecule parenterals, the development of protein formulations that includes preservatives can be challenging. Preservatives almost always have a destabilizing effect (aggregation) on proteins, and this has become a major factor in limiting their use in multi-dose protein formulations.
  • the antibody construct of the invention generally will be designed for specific routes and methods of administration, for specific administration dosages and frequencies of administration, for specific treatments of specific diseases, with ranges of bio-availability and persistence, among other things.
  • Formulations thus may be designed in accordance with the invention for delivery by any suitable route, including but not limited to orally, aurally, opthalmically, rectally, and vaginally, and by parenteral routes, including intravenous and intraarterial injection, intramuscular injection, and subcutaneous injection.
  • kits for producing a single-dose administration unit may each contain both a first container having a dried protein and a second container having an aqueous formulation.
  • kits containing single and multi-chambered pre-filled syringes e.g., liquid syringes and lyosyringes are provided.
  • an antibody construct of the invention protein-containing pharmaceutical composition to be employed will depend, for example, upon the therapeutic context and objectives.
  • One skilled in the art will appreciate that the appropriate dosage levels for treatment will vary depending, in part, upon the molecule delivered, the indication for which the antibody construct of the invention is being used, the route of administration, and the size (body weight, body surface or organ size) and/or condition (the age and general health) of the patient.
  • the clinician may titer the dosage and modify the route of administration to obtain the optimal therapeutic effect.
  • a typical dosage may range from about 0.1 ⁇ g/kg to up to about 30 mg/kg or more, depending on the factors mentioned above.
  • the dosage may range from 1.0 ⁇ g/kg up to about 20 mg/kg, optionally from 10 ⁇ g/kg up to about 10 mg/kg or from 100 ⁇ g/kg up to about 5 mg/kg.
  • a therapeutic effective amount of an antibody construct of the invention preferably results in a decrease in severity of disease symptoms, in increase in frequency or duration of disease symptom-free periods or a prevention of impairment or disability due to the disease affliction.
  • a therapeutically effective amount of the antibody construct of the invention e.g. an anti-CDH19/CD3 antibody construct, preferably inhibits cell growth or tumor growth by at least about 20%, at least about 40%, at least about 50%, at least about 60%, at least about 70%, at least about 80%, or at least about 90% relative to untreated patients.
  • the ability of a compound to inhibit tumor growth may be evaluated in an animal model predictive of efficacy in human tumors.
  • compositions may be administered using a medical device.
  • medical devices for administering pharmaceutical compositions are described in U.S. Pat. Nos. 4,475,196; 4,439,196; 4,447,224; 4,447,233; 4,486,194; 4,487,603; 4,596,556; 4,790,824; 4,941,880; 5,064,413; 5,312,335; 5,312,335; 5,383,851; and 5,399,163, all incorporated by reference herein.
  • the invention provides the antibody construct of the invention or produced according to the process of the invention for use in the prevention, treatment or amelioration of a melanoma disease or metastatic melanoma disease.
  • the invention also provides a method for the treatment or amelioration of a melanoma disease or metastatic melanoma disease, comprising the step of administering to a subject in need thereof the antibody construct of the invention or produced according to the process of the invention.
  • the melanoma disease or metastatic melanoma disease is selected from the group consisting of superficial spreading melanoma, lentigo maligna, lentigo maligna melanoma, acral lentiginous melanoma and nodular melanoma.
  • the invention provides a kit comprising an antibody construct of the invention, or produced according to the process of the invention, a vector of the invention, and/or a host cell of the invention.
  • Fully human antibodies to Cadherin-19 were generated using XENOMOUSE® technology, transgenic mice engineered to express diverse repertoires of fully human IgG ⁇ and IgG ⁇ antibodies of the corresponding isotype.
  • mice were immunized with multiple forms of Cadherin-19 immunogen, including: (1) full length human and cynomologous (“cyno”) monkey cadherin-19, (2) secreted Cadherin-19 ecto-domain (amino acids 1-596), and (3) a truncated membrane bound form of human cadherin-19 (amino acids 1-624). Mice were immunized over a period of 8 to 10 weeks with a range of 16-18 boosts.
  • cyno cynomologous
  • Sera were collected at approximately 5 and 9 weeks after the first injection and specific titers were determined by FACs staining of recombinant Cadherin-19 receptor transiently expressed on CHO—S cells. A total of 37 animals were identified with specific immune responses, these animals were pooled into 3 groups and advanced to antibody generation.
  • lymphocytes were obtained from draining lymph nodes and, if necessary, pooled for each cohort. Lymphocytes were dissociated from lymphoid tissue by grinding in a suitable medium (for example, Dulbecco's Modified Eagle Medium (DMEM); obtainable from Invitrogen, Carlsbad, Calif.) to release the cells from the tissues, and suspended in DMEM. B cells were selected and/or expanded using standard methods, and fused with suitable fusion partner using techniques that were known in the art.
  • DMEM Dulbecco's Modified Eagle Medium
  • hybridoma supernatants were collected and subjected to screening assays as detailed in the examples below, including confirmation of binding to human and cynomologous monkey as well as the ability to kill cell lines in secondary antibody-drug conjugate Bioassays.
  • Hybridoma lines that were identified to have the binding and functional properties of interest were then further selected and subjected to standard cloning and subcloning techniques. Clonal lines were expanded in vitro, and the secreted human antibodies obtained for analysis and V gene sequencing was performed.
  • hybridoma supernatants were screened for CDH19-specific monoclonal antibodies by Fluorometric Microvolume Assay Technology (FMAT) (Applied Biosystems, Foster City, Calif.). The supernatants were screened against adherent CHO cells transiently transfected with human Cadherin-19 and counter screened against CHO cells transiently transfected with the same expression plasmid that did not contain the Cadherin-19 gene.
  • FMAT Fluorometric Microvolume Assay Technology
  • FACS binding assays were performed to evaluate the binding of the anti-Cadherin-19 receptor specific antibodies to endogenous Cadherin-19 receptor expressed on the CHL-1 tumor cell lines.
  • cross-reactive binding to murine and cynomologous monkey Cadherin-19 orthologues was also evaluated by FACs using recombinant forms of the various receptors transiently expressed on 293T cells.
  • FACs assays were performed by incubating hybridoma supernatants with 10,000 to 25,000 cells in PBS/2% Fetal bovine serum/2 mM Calcium Chloride at 4° C. for one hour followed by two washes with PBS/2% Fetal bovine serum/2 mM Calcium Chloride. Cells were then treated with florochrome-labeled secondary antibodies at 4° C. followed by one wash. The cells were resuspended in 50 ⁇ l of PBS/2% FBS and antibody binding was analyzed using a FACSCaliburTM instrument.
  • CDH19-positive cell lines Cold-through internalization and the catabolism of the drug-conjugate into a form that it is toxic to the cell.
  • CDH19-positive cell lines Cold-through internalization and the catabolism of the drug-conjugate into a form that it is toxic to the cell.
  • CDH19-positive cell lines Cold-through internalization and the catabolism of the drug-conjugate into a form that it is toxic to the cell.
  • CDH19-positive cell lines Cold-65 or CHL-1
  • XENOMOUSE® hybridoma samples containing fully human anti-CDH19 antibodies were then added to these cells in the presence of a high concentration of a goat anti-human Fc monovalent Fab conjugated with DM1 (DM1-Fab) at a relatively low drug-antibody ratio (DAR) ( ⁇ 1.3).
  • DAR drug-antibody ratio
  • FIG. 1 and FIG. 2 An example of the cell viability data with the Colo-699 cells is shown in FIG. 1 and FIG. 2 .
  • the antibodies capable of delivering the DM1-Fab to the cells and inhibiting the cell growth read out with a lower luminescent signal (RLU).
  • the top antibodies of interest from this screen are observed in the lower left corner of FIG. 1 and are denoted as open circles.
  • These antibodies were taken forward into a cell viability assay on CHL-1 cells.
  • the average cell viability data from the CHL-1 assay is plotted against the average cell viability data from the Colo-699 assay ( FIG. 2 ).
  • the antibodies that had activity on both the Colo-699 and the CHL-1 cells are denoted as open circles on the left-hand side of the FIG. 2 .
  • This assay was run concurrently with the FACs antibody binding assay above (2.2), and the results from these two studies were used to select the antibodies for further characterization.
  • 1570 antibodies were run through these cell based viability assays and approximately 44 antibodies were selected on the bases of in vitro cell killing and/or antibody binding for sub-cloning, V gene sequencing and expressed in recombinant form for further characterization assays as described below.
  • a 4A9 binding competition method was developed to identify antibodies that compete with 4A9 binding.
  • 96-well V-bottom plates (Sarstedt #82.1583.001)
  • 50,000 transiently transfected 293T cells were incubated with 5 ug/ml of purified anti-CDH19 antibodies for 1 hr at 4° C. followed by one wash with PBS/2% FBS.
  • 25 ⁇ l of 5 ⁇ g/ml Alexa647-labelled 4A9 was then added to each well and the plates incubated for 1 hour at 4° C. Cells were then washed two times and the amount of cell associated Alexa647-labelled 4A9 was quantitated by flow cytometry.
  • the experiments included negative controls consisting of PBS/2% FBS only. The average signal observed in these negative control experiments was adopted as the maximum possible signal for the assay. Antibodies were compared to this maximum signal and a percent inhibition was calculated for each well (% Inhibition (1 ⁇ (FL4 Geomean with the anti-CDH19 antibodies/Maximum FL4 Geomean signal)).
  • Domain binding was determined by flow cytometry on 293T cells transiently transfected with plasmids consisting of single human CDH19 cadherin repeat domain replacements into the chicken Cadherin19 backbone cloned into the pTT5 expression vector immediately preceded by native human or chicken CDH19 leader sequences and a Flag tag.
  • the experiment included assaying a subset of anti-CDH19 antibodies against chicken Cadherin19 to determine suitability for binning on these human/chicken chimeras.
  • Domain binding was determined by flow cytometry on 293T cells transiently transfected with plasmids consisting of rhesus macaque CDH19 cadherin repeat domain 1 or segments domain 1 (designated EC1a, EC1b, EC1c) replacements into the dog Cadherin19 backbone, or rat CDH19 cadherin repeat domain 2 replacement into the rhesus Cadherin19 backbone cloned into the pTT5 expression vector immediately preceded by native rhesus or canine CDH19 leader sequences and a Flag tag.
  • the experiment included assaying a subset of anti-CDH19 antibodies against dog, rat and macaque Cadherin19 to determine suitability for binning on these macaque/dog and rat/rhesus chimeras.
  • Domain binding was determined by flow cytometry on 293T cells transiently transfected with plasmids consisting of rat CDH19 cadherin repeat domain 3 substitutions (designated EC3a, EC3b) or human CDH19 cadherin repeat domain 3 substitution (designated EC3c) into the mouse Cadherin19 backbone cloned into the pTT5 expression vector immediately preceded by native mouse CDH19 leader sequence and a Flag tag.
  • the experiment included assaying a subset of anti-CDH19 antibodies against human, rat and mouse Cadherin19 to determine suitability for binning on these rat/mouse and human/mouse chimeras.
  • Bin B.1 Rat anti-FLAG + + + + + + + + + control Positive Binding (+) Negative Binding ( ⁇ ) Not Determined (n.d.)
  • A huCDH19(44-772) (see SEQ ID NO: 944)
  • I muCDH19(44-770) (see SEQ ID NO: 966)
  • W raCDH19(44-770) (see SEQ ID NO: 1464)
  • X muCDH19(44-323)::raCDH19(324-327)::muCDH19(328-770) (see SEQ ID NO: 1465)
  • Y muCDH19(44-770)::raCDH19(290, 299, 308) (see SEQ ID NO: 1466)
  • Z muCDH19(44-770)::huCDH19(271) (see SEQ ID NO: 1467)
  • a total of 18 antibodies were analyzed for potential hotspots and covariance violations.
  • the designed variants (shown below) outline amino acid substitutions capable of reducing and/or avoiding isomerization, deamidation, oxidation, covariance violations, and the like.
  • the 80 engineered variants together with the 15 parental antibodies, thus totaling 95 sequences, were taken forward to the cloning, expression, and purification processes.
  • Site-directed mutagenesis was performed on the engineered variants in a 96-well format.
  • the parental antibodies and engineered variants were expressed by high throughput transient transfection in HEK 293-6E cells, purified using a modified AKTA auto-sampler and assayed for activity and biophysical characteristics.
  • the 3 parental antibodies that had either free (unpaired) Cys or N-glycosylation site were not taken forward in this process. Those were replaced with the engineered version of the parental antibodies.
  • the designed variants outline amino acid substitutions capable of reducing and/or avoiding isomerization, deamidation, oxidation, covariance violations, immunogenicity and the like. It will be appreciated that these variant sequences are examples of engineered antibodies within the meaning of the present application but single point and/or multiple point mutations can be combined in any combinatorial manner in order to arrive at a final desired antigen binding molecule or antibody.
  • qRT-PCR Quantitative Real Time Polymerase Chain Reaction
  • Threshold cycle values were determined, using Sequence Detector software version 2.3 (Applied Biosystems) and transformed to 2 ⁇ CT for relative expression of CDH19 specific transcript to ACTB. The results are shown in FIG. 3 . Of 54 unique metastatic and primary melanoma samples, the majority can be seen to overexpress CDH19 mRNA relative to the expression in samples from normal tissue.
  • FIG. 4 Expression of CDH19 protein was analyzed in human tumor samples by IHC and the results are shown in FIG. 4 .
  • Samples were fixed in 10% neutral buffered formalin for 24 hours, dehydrated and paraffin embedded. 4 ⁇ m sections were cut. Sections were deparaffinized first and then heated in DIVA Decloaker solution (Biocare) for 40 minutes for antigen retrieval. Remaining IHC steps were performed at room temperature in a DAKO Autostainer. Sections were incubated for 10 minutes with Peroxidazed 1 (Biocare) to block endogenous peroxidase, followed by incubation for 10 minutes with background sniper (Biocare) to reduce nonspecific background.
  • Peroxidazed 1 Biocare
  • background sniper Biocare
  • CDH19 antibody Novo Biologicals, Catalog #H00028513-B01P
  • DAKO Envision+HRP anti-mouse polymer
  • DAKO hematoxylin
  • Tumor cell lines were analyzed by flow cytometry and IHC to identify model systems with CDH19 expression similar to human tumors.
  • Human anti-huCDH19 IgG4 antibody 4A2 was purified directly from hybridoma conditioned media.
  • 2 ⁇ 10 5 cells were incubated with 200 nM of the CDH19 4A2 antibody that was conjugated to PE at a 1:1 ratio. The incubation and subsequent wash steps were performed in the presence of 1.2 mM calcium.
  • a tube of QuantiBRITE PE lyophilized beads with four levels of PE (BD, cat#340495) was simultaneously prepared according to the manufacturer's instructions. The beads were analyzed by flow cytometry to generate a standard curve.
  • the PE median values obtained from the melanoma lines after FACS analysis were then calibrated against the standard curve to calculate the antibodies bound per cell (ABC), which provides an estimate of the number of receptors on each cell.
  • ABC antibodies bound per cell
  • IHC was performed as described in Example 6 and the results are provided in FIG. 5 .
  • the melanoma cell line CHL-1 expresses about 10,000 CDH19 molecules on the cell surface, while Colo699 cells express about 5,000 receptors. Both cell lines represent tumors with medium to high expression levels based on IHC. Expression in A2058 is very low, while LOX cells do not express any detectable CDH19 protein.
  • L1.2 transfected with human CDH19, the human melanoma cell lines CHL-1 and A2058 expressing native human CDH19, CD3-expressing human T cell leukemia cell line HPB-ALL (DSMZ, Braunschweig, ACC483) and the CD3-expressing macaque T cell line 4119LnPx (Knappe A, et al., Blood, 2000, 95, 3256-3261) were used as antigen positive cell lines.
  • untransfected L1.2 cells were used as negative control.
  • the CDH19/CD3 bispecific antibodies stained L1.2 cells transfected with human CDH19, the human CDH19-expressing melanoma cell lines CHL-1 and A2058 as well as human and macaque T cells. Moreover, there was no staining of untransfected L1.2 cells (see FIG. 6 ).
  • PBMC Human peripheral blood mononuclear cells
  • enriched lymphocyte preparations e.g. buffy coats
  • Buffy coats were supplied by a local blood bank and PBMC were prepared on the same day of blood collection.
  • erythrocytes were removed from PBMC via incubation with erythrocyte lysis buffer (155 mM NH 4 Cl, 10 mM KHCO 3 , 100 ⁇ M EDTA). Platelets were removed via the supernatant upon centrifugation of PBMC at 100 ⁇ g.
  • Remaining lymphocytes mainly encompass B and T lymphocytes, NK cells and monocytes.
  • PBMC were kept in culture at 37° C./5% CO 2 in RPMI medium (Gibco) with 10% FCS (Gibco).
  • CD14 MicroBeads and CD56 MicroBeads (20 ⁇ L/10 7 cells) were added and incubated for 15 min at 4-8° C. The cells were washed with MACS isolation buffer (1-2 mL/10 7 cells). After centrifugation (see above), supernatant was discarded and cells resuspended in MACS isolation buffer (500 ⁇ L/10 8 cells). CD14/CD56 negative cells were then isolated using LS Columns (Miltenyi Biotec, #130-042-401). PBMC w/o CD14+/CD56+ cells were cultured in RPMI complete medium i.e.
  • RPMI1640 Biochrom AG, #FG1215) supplemented with 10% FBS (Biochrom AG, #S0115), 1 ⁇ non-essential amino acids (Biochrom AG, #K0293), 10 mM Hepes buffer (Biochrom AG, #L1613), 1 mM sodium pyruvate (Biochrom AG, #L0473) and 100 U/mL penicillin/streptomycin (Biochrom AG, #A2213) at 37° C. in an incubator until needed.
  • FBS Biochrom AG, #S0115
  • 1 ⁇ non-essential amino acids Biochrom AG, #K0293
  • 10 mM Hepes buffer Biochrom AG, #L1613
  • 1 mM sodium pyruvate Biochrom AG, #L0473
  • 100 U/mL penicillin/streptomycin Biochrom AG, #A2213
  • the fluorescent membrane dye DiOC 18 (DiO) (Molecular Probes, #V22886) was used to label human CDH19 ⁇ as target cells and distinguish them from effector cells. Briefly, cells were harvested, washed once with PBS and adjusted to 10 6 cell/mL in PBS containing 2% (v/v) FBS and the membrane dye DiO (5 ⁇ L/10 6 cells). After incubation for 3 min at 37° C., cells were washed twice in complete RPMI medium and the cell number adjusted to 1.25 ⁇ 10 6 cells/mL. The vitality of cells was determined using 0.5% (v/v) isotonic EosinG solution (Roth, #45380).
  • This assay was designed to quantify the lysis of human CDH19-transfected CHO cells in the presence of serial dilutions of CDH19 bispecific antibodies.
  • Equal volumes of DiO-labeled target cells and effector cells i.e., PBMC w/o CD14 + cells
  • PBMC w/o CD14 + cells PBMC w/o CD14 + cells
  • E:T cell ratio 10:1.
  • 160 ⁇ L of this suspension were transferred to each well of a 96-well plate.
  • 40 ⁇ L of serial dilutions of the CDH19 bispecific antibodies and a negative control bispecific (an CD3-based bispecific antibody recognizing an irrelevant target antigen) or RPMI complete medium as an additional negative control were added.
  • the bispecific antibody-mediated cytotoxic reaction proceeded for 48 hours in a 7% CO 2 humidified incubator.
  • PI propidium iodide
  • Target cells were identified as DiO-positive cells. PI-negative target cells were classified as living target cells. Percentage of cytotoxicity was calculated according to the following formula:
  • mice 5 million Colo699 or CHL-1 tumor cells were admixed with 2.5 million freshly isolated peripheral blood mononuclear cells (PBMC) and injected subcutaneously in the left flank of female athymic nude mice on Day 0. The same day, mice were treated intraperitoneally with either CDH19 BiTE 2G6 or non-specific control BiTE (MEC14) at the indicated doses. Dosing continued daily for the first 10 days post-tumor inoculation.
  • PBMC peripheral blood mononuclear cells
  • Tumor volumes and body weights were measured twice per week using calipers and an analytical scale, respectively.
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