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Xiong L, Kasuya J, Li SL, et al. Growth-stimulatory monoclonal antibodies against human insulin-like growth factor I receptor. Proc Natl Acad Sci U S A. 1992;89(12):5356-60doi: 10.1073/pnas.89.12.5356.
Xiong, L., Kasuya, J., Li, S. L., Kato, J., & Fujita-Yamaguchi, Y. (1992). Growth-stimulatory monoclonal antibodies against human insulin-like growth factor I receptor. Proceedings of the National Academy of Sciences of the United States of America, 89(12), 5356-60. https://doi.org/10.1073/pnas.89.12.5356
Xiong, L, et al. "Growth-stimulatory monoclonal antibodies against human insulin-like growth factor I receptor." Proceedings of the National Academy of Sciences of the United States of America vol. 89,12 (1992): 5356-60. doi: https://doi.org/10.1073/pnas.89.12.5356
Xiong L, Kasuya J, Li SL, Kato J, Fujita-Yamaguchi Y. Growth-stimulatory monoclonal antibodies against human insulin-like growth factor I receptor. Proc Natl Acad Sci U S A. 1992 Jun 15;89(12):5356-60. doi: 10.1073/pnas.89.12.5356. PMID: 1319060; PMCID: PMC49290.
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Proc Natl Acad Sci U S A. 1992 Jun 15;89(12):5356-60. doi: 10.1073/pnas.89.12.5356.

Growth-stimulatory monoclonal antibodies against human insulin-like growth factor I receptor.

Proceedings of the National Academy of Sciences of the United States of America

L Xiong, J Kasuya, S L Li, J Kato, Y Fujita-Yamaguchi

Affiliations

  1. Department of Molecular Genetics, Beckman Research Institute of the City of Hope, Duarte, CA 91010.

PMID: 1319060 PMCID: PMC49290 DOI: 10.1073/pnas.89.12.5356
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Abstract

Monoclonal antibodies (mAbs) against purified human placental insulin-like growth factor I (IGF-I) receptors were prepared and characterized. Three IgG mAbs were specific for the human IGF-I receptor and displayed negligible crossreactivity with the human insulin receptor. They stimulated 125I-labeled IGF-I (125I-IGF-I) or 125I-IGF-II binding to purified human placental IGF-I receptors and to IGF-I receptors expressed in NIH 3T3 cells in contrast to the well-studied mAb alpha IR-3, which inhibits 125I-IGF-I or 125I-IGF-II binding to both forms of IGF-I receptors. The mAbs introduced in this study stimulated DNA synthesis in NIH 3T3 cells expressing human IGF-I receptors approximately 1.5-fold above the basal level and the IGF-I- or IGF-II-stimulated level. In contrast, alpha IR-3 inhibited both basal and IGF-I or IGF-II-stimulated DNA synthesis by approximately 30%. Inhibition of IGF-II-stimulated DNA synthesis by alpha IR-3 was as potent as its inhibition of IGF-I-stimulated DNA synthesis, although IGF-II binding to the IGF-I receptors was not inhibited by IGF-II as potently as was IGF-I. With the purified IGF-I receptors, both inhibitory and stimulatory mAbs were shown to activate autophosphorylation of the IGF-I receptor beta subunit and to induce microaggregation of the receptors. These results suggest that conformational changes resulting from receptor dimerization in the presence of either type of mAb may affect the signal-transducing function of the IGF-I receptor differently. These additional mAbs and alpha IR-3 immunoprecipitated nearly 90% of IGF-I binding activity from Triton X-100-solubilized human placental membranes, indicating that IGF-I receptor reactive with these mAbs is the major form of the IGF-I receptor in human placenta.

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