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. 1988 Aug;85(16):5936–5940. doi: 10.1073/pnas.85.16.5936

Autocrine growth induced by the insulin-related factor in the insulin-independent teratoma cell line 1246-3A.

Y Yamada 1, G Serrero 1
PMCID: PMC281880  PMID: 3045808

Abstract

An insulin-independent teratoma-derived cell line, called 1246-3A, has been isolated from the adipogenic cell line 1246, which stringently requires insulin for proliferation. The 1246-3A cell line, which can proliferate in the absence of exogenous insulin, produces in its conditioned medium a growth factor similar to pancreatic insulin by its biological and immunological properties. This factor, called "insulin-related factor" (IRF), was purified and iodinated to study its binding to cell surface receptors. 125I-labeled IRF binding to intact 1246-3A cells is lower than to 1246 cells. Cell surface binding can be restored by culturing the 1246-3A cells in the presence of an anti-porcine insulin monoclonal antibody or by acid prewash of the cells prior to performing the binding. Scatchard analysis of binding indicates that IRF secreted by the 1246-3A cells partially occupies high-affinity binding sites on the producer cells. Moreover, insulin monoclonal antibody inhibits the proliferation of the IRF-producing 1246-3A cells, suggesting that these cells are dependent on the secreted IRF for growth in culture. We conclude that the insulin-related factor secreted by the insulin-independent 1246-3A cells stimulates their proliferation in an autocrine fashion.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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