Summary
The first step of the action of IGF1 and IGF2 (IGFs) is their binding to membrane receptors. IGF binding sites have been characterized by competitive binding and cross-linking techniques in human breast cancer cell lines as well as in human breast cancers and in human benign breast diseases. IGF2 is a good competitor of125I-IGF1 binding to IGF1-R; insulin competes but with a potency 1/100 lower than the IGF1 potency. Chemical cross-linking experiments revealed that the apparent molecular weight of the IGF1-binding sites is 130,000. Alpha IR-3, a murine monoclonal antibody against the IGF1-R, blocks IGF1-binding to this receptor. This antibody inhibits the IGF1-stimulated growth of breast cancer cells. Therefore, the IGF1 specific binding sites correspond to the previously described type 1 IGF receptors (IGF1-R) in normal tissues. Cross-linking experiments with labeled IGF2 resulted in a major band of apparent Mr 260,000–270,000 that was inhibited by unlabeled IGF2 but not by insulin, and corresponds to the type 2 IGF receptor; a second band of apparent Mr 130,000 was inhibited by excess IGFs and insulin (Type I receptor). The alpha-IR3 inhibition of the IGF2 mitogenic activity suggest that IGF1-R partially mediates the growth effect of IGF2 in these cells.
We and others have demonstrated that most breast cancer cell lines contain IGF1-R. This is also the case in breast cancer biopsies in which histo-autoradiographic analyses allowed the localization of IGF1-R on the epithelial component. IGF1-R concentrations were positively correlated to estradiol and progesterone receptor concentrations. In our experience, the presence of IGF1-R is associated with a better prognosis. Finally, IGF1-R are found less frequently and at lower concentrations in benign breast diseases. These results suggest that IGF1-R could be a marker of the proliferative epithelial component within the tumor.
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Peyrat, J.P., Bonneterre, J. Type 1 IGF receptor in human breast diseases. Breast Cancer Res Tr 22, 59–67 (1992). https://doi.org/10.1007/BF01833334
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DOI: https://doi.org/10.1007/BF01833334