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• W2162012034 abstract "Surgically removed solid human benign and malignant neoplasms and nonneoplastic tissues were examined for the presence of transforming growth factors (TGFs). TGFs are polypeptide growth factor-like substances which cause the appearance of a reversible neoplastic phenotype in nontransformed, anchorage-dependent cells in culture, including the induction of the ability to grow while suspended in semisolid medium. Acid-ethanol extracts from adenocarcinomas of the breast, colon, kidney, and ovary; fibrosarcoma and leiomyosarcoma; Hodgkin's lymphoma; fibroadenoma of the breast; uterine leiomyoma; and nonneoplastic kidney and lung were found to cause growth in soft agar of both nontransformed mouse AKR-2B and rat NRK cells. This colony-stimulating activity, where tested, was heat and acid stable but was destroyed by trypsin and dithiothreitol treatment, indicating that the activity is due to a polypeptide with disulfide bonds. Extracts from several of the tumors provided sufficient material for purification by molecular sieve chromatography. Peaks of colony-stimulating activity from a Bio-Gel P-60 column eluted with 1 M acetic acid were detected in the M, 3,000 to 25,000 range with the apparent molecular weight varying depending on the type of tumor being studied and the indicator cells used. The data suggest that at least three TGFs are present in human tumors. Evidence is presented differentiating these TGFs into TGFa, which has selective activity for stimulating AKR-2B cells, and TGFn, which has selective activity for stimulating NRK cells. The NGFn activity was further subdivided into a TGFns fraction and TGFnl fraction, denoting small (less than 6,000) and large (12,000 to 20,00) apparent molecular weights, respectively. The TGFa and TGFnl activities were present in malignant and nonneoplastic (kidney and lung) tissue, whereas the TGFns activity predominated in benign neoplasms. These TGFs exhibited no competition with epidermal growth factor for binding to the epidermal growth factor receptor, and the TGFnl activity was potentiated by epidermal growth factor." @default.
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• W2162012034 date "1983-05-01" @default.
• W2162012034 modified "2023-10-17" @default.
• W2162012034 title "Transforming growth factors in solid human malignant neoplasms." @default.
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