title: Secretion of an insulin-like growth factor-I-related protein by human breast cancer cells.
abstract: Somatomedin activity is required for proliferation of normal cells; recently somatomedin activity in the cellular environment was shown to be necessary for expression of the transformed phenotype. We demonstrate here that authentic serum-derived insulin-like growth factor-I (IGF-I) stimulates the proliferation of four human breast cancer cell lines, MCF-7, MDA-MB-231, ZR-75-1, and Hs578T in serum-free monolayer culture and that each of these lines produces and secretes an IGF-I-related growth factor. The two highly tumorigenic estrogen-independent cell lines, MDA-MB-231 and Hs578T, produced 2- to 10-fold more IGF-I than did two estrogen responsive cell lines, MCF-7 and ZR-75-1, which are not tumorigenic in the absence of estrogen. These breast cancer cells also secrete a Mr 50,000 binding activity which partially obscured detection of IGF-I by radioimmunoassay. Acid-ethanol extraction allowed dissociation of the high molecular weight complex; whereupon, fully immunoreactive IGF-I comigrated on acid gel exclusion chromatography with authentic human serum-derived IGF-I. Radioimmunoassay displacement curves for breast cancer cell line-derived IGF-I were parallel to those for authentic IGF-I. Northern blot analysis of mRNA from four breast cancer cell lines demonstrated specific hybridization with a human IGF-I probe corresponding to one of the two major transcripts seen in human liver mRNA. These data suggest that breast cancer cell line-derived IGF-I is similar to liver-synthesized, serum-derived IGF-I.
mesh_terms: D001943:Breast Neoplasms / Q000378:metabolism* / Q000473:pathology; D002352:Carrier Proteins / Q000378:metabolism; D002453:Cell Cycle / Q000187:drug effects; D003470:Culture Media; D004958:Estradiol / Q000494:pharmacology; D006133:Growth Substances / Q000378:metabolism*; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics; D011863:Radioimmunoassay; D013002:Somatomedins / Q000378:metabolism*
chemical_list: D002352:Carrier Proteins; D003470:Culture Media; D006133:Growth Substances; D012333:RNA, Messenger; D013002:Somatomedins; D004958:Estradiol; D007334:Insulin-Like Growth Factor I