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Anti-IGF-I receptor antibody

a technology of anti-igf-i receptor and antibody, which is applied in the field of antibodies, can solve problems such as agonistic activity, and achieve the effect of increasing utility

Inactive Publication Date: 2005-08-25
IMMUNOGEN INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020] In a second embodiment, there are provided resurfaced or humanized versions of antibody EM164 wherein surface-exposed residues of the antibody or its fragments are replaced in both light and heavy chains to more closely resemble known human antibody surfaces. Such humanized antibodies may have increased utility, compared to murine EM164, as therapeutic or diagnostic agents. Humanized versions of antibody EM164 are also fully characterized herein with respect to their respective amino acid sequences of both light and heavy chain variable regions, the DNA sequences of the genes for the light and heavy chain variable regions, the identification of the CDRs, the identification of their surface amino acids, and disclosure of a means for their expression in recombinant form.

Problems solved by technology

Thus, although IR3 antibody is the most commonly used inhibitory antibody for IGF-I receptor studies in vitro, it suffers from the drawback that it exhibits agonistic activity in transfected 3T3 and CHO cells expressing human IGF-I receptor (Kato, H. et al., 1993, J. Biol. Chem., 268, 2655-2661; Steele-Perkins, G. and Roth, R. A., 1990, Biochem. Biophys. Res. Commun., 171, 1244-1251).

Method used

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Examples

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example 1

Murine EM164 Antibody

[0106] In this first example, the complete primary amino acid structure and cDNA sequence of a murine antibody of the present invention is disclosed, together with its binding properties and means for its expression in recombinant form. Accordingly, there is provided a full and complete disclosure of an antibody of the invention and its preparation, such that one of ordinary skill in the immunological arts would be able to prepare said antibody without undue experimentation.

A. Generation of Anti-IGF-I Receptor Monoclonal Antibody Hybridoma

[0107] A cell line expressing human IGF-I receptor with a Y1251F mutation was used for immunization as it expressed a high number of IGF-I receptors (˜107 per cell). The Y1251F-mutation in the cytoplasmic domain of IGF-I receptor resulted in loss of transformation and anti-apoptotic signaling, but did not affect IGF-I binding and IGF-I-stimulated mitogenic signaling (O'Connor, R. et al., 1997, Mol. Cell. Biol., 17, 427-435;...

example 2

Humanized Versions of EM164 Antibody

[0167] Resurfacing of the EM164 antibody to provide humanized versions suitable as therapeutic or diagnostic agents generally proceeds according to the principles and methods disclosed in U.S. Pat. No. 5,639,641, and as follows.

A. Surface Prediction

[0168] The solvent accessibility of the variable region residues for a set of antibodies with solved structures was used to predict the surface residues for the murine anti-IGF-I receptor antibody (EM164) variable region. The amino acid solvent accessibility for a set of 127 unique antibody structure files (Table 2) were calculated with the MC software package (Pedersen et al., 1994, J. Mol. Biol., 235, 959-973). The ten most similar light chain and heavy chain amino acid sequences from this set of 127 structures were determined by sequence alignment. The average solvent accessibility for each variable region residue was calculated, and positions with greater than a 30% average accessibility were co...

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Abstract

Antibodies, humanized antibodies, resurfaced antibodies, antibody fragments, derivatized antibodies, and conjugates of same with cytotoxic agents, which specifically bind to, and inhibit, insulin-like growth factor-I receptor, antagonize the effects of IGF-I, IGF-II and serum on the growth and survival of tumor cells, and which are substantially devoid of agonist activity. Said antibodies and fragments thereof may be used, optionally in conjunction with other therapeutic agents, in the treatment of tumors that express elevated levels of IGF-I receptor, such as breast cancer, colon cancer, lung cancer, ovarian carcinoma, synovial sarcoma, prostate cancer and pancreatic cancer, and said derivatized antibodies may be used in the diagnosis and imaging of tumors that express elevated levels of IGF-I receptor.

Description

[0001] The present application is a continuation-in-part of parent application Ser. No. 10 / 170,390, filed Jun. 14, 2002, incorporated herein by reference in its entirety.FIELD OF THE INVENTION [0002] The present invention relates to antibodies that bind to human insulin-like growth factor-I receptor (IGF-I receptor). More particularly, the invention relates to anti-IGF-I receptor antibodies that inhibit the cellular functions of the IGF-I receptor. Still more particularly, the invention relates to anti-IGF-I receptor antibodies that antagonize the effects of IGF-I, IGF-II and serum on the growth and survival of tumor cells and which are substantially devoid of agonist activity. The invention also relates to fragments of said antibodies, humanized and resurfaced versions of said antibodies, conjugates of said antibodies, antibody derivatives, and the uses of same in diagnostic, research and therapeutic applications. The invention further relates to improved antibodies or fragments th...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01N33/534A61K39/395A61P35/00A61P43/00C07K16/18C07K16/28C07K19/00C12N1/15C12N1/19C12N1/21C12N5/06C12N5/10C12N5/16C12N15/09C12N15/13C12N15/62C12P21/02C12P21/08G01N33/53
CPCA61K39/39541A61K2039/505C07K16/2863C07K2316/96C07K2317/24C07K2317/55C07K2317/92C07K2317/56C07K2317/565A61K2300/00A61P35/00A61P43/00C07K2317/73C07K2317/76
Inventor SINGH, RAJEEVATAVARES, DANIELDAGDIGIAN, NANCY
Owner IMMUNOGEN INC
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