Bifunctional activity of transforming growth factor type ? on the growth of NRK-49F cells, normal and transformed by kirsten murine sarcoma virus
- 1 July 1988
- journal article
- research article
- Published by Wiley in Journal of Cellular Physiology
- Vol. 136 (1), 175-181
- https://doi.org/10.1002/jcp.1041360123
Abstract
Transformation of rat NRK-49F cells (49F) by Kirsten murine sarcoma virus (Ki-MSV) renders these cells (Ki-49F cells) capable of autonomous anchorage independent (Al) growth. As compared to nontransformed 49F cells, the transformation by Ki-MSV does not modify the cell response to transforming growth factor-β (TGF-β) in monolayer conditions, but alters it in A I growth conditions. The growth of nontransformed or Ki-MSV-transformed adherent 49F cells is slowed down by porcine TGF-β, and this effect is reversed by epidermal growth factor (EGF). This decrease in the cell growth rate, induced by TGF-β, does not affect the cloning efficiency of untransformed and transformed adherent 49F cells. Contrarily, porcine TGF-β decreases the A I cloning efficiency of Ki-49F cells in agar-gelled medium; this effect is only partly reversed by EGF, which does not synergise with TGF-β to enhance the A I growth as in the case of untransformed 49F cells. Media conditioned by 49F cells, Ki-49F cells, and chicken embryo fibroblasts contain a latent TGF-β whose capacity to promote the A I growth of 49F cells and to inhibit that of Ki-49F cells is unmasked by acidification. The same situation exists concerning TGF-β from human platelets. Neutral extracts are inefficient in both tests of promotion and inhibition of A I growth and contain an acid-activable component with an apparent molecular weight of 600 kd. In acid extracts, a 5–9 kd apparent molecular weight component is responsible for the A I growth enhancement of 49F cells and the A I growth inhibition of Ki-49F cells. Further purification by reverse phase chromatography shows that both activities strictly coelute at the same point (32%) of an acetonitrile gradient. These results indicate that TGF-β is present in physiological conditions as a latent form which requires activation for inhibiting the A I growth of transformed cells as well as for enhancing that of 49F cells.Keywords
This publication has 43 references indexed in Scilit:
- The transforming growth factor-β system, a complex pattern of cross-reactive ligands and receptorsCell, 1987
- Production of transforming growth factor beta by human T lymphocytes and its potential role in the regulation of T cell growth.The Journal of Experimental Medicine, 1986
- β-Transforming Growth Factor is stored in human blood platelets as a latent high molecular weight complexBiochemical and Biophysical Research Communications, 1986
- Anchorage‐independent growth of primary rat embryo cells is induced by platelet‐derived growth factor and inhibited by type‐beta transforming growth factorJournal of Cellular Physiology, 1986
- Conversion of a high molecular weight latent β-TGF from chicken embryo fibroblasts into a low molecular weight active β-TGF under acidic conditionsBiochemical and Biophysical Research Communications, 1985
- DNA synthesis in rat hepatocytes: Inhibition by a platelet factor and stimulation by an endogenous factorJournal of Cellular Physiology, 1985
- The transforming growth factorsTrends in Biochemical Sciences, 1985
- Transforming growth factor-beta modulates the high-affinity receptors for epidermal growth factor and transforming growth factor-alpha.The Journal of cell biology, 1985
- Growth Inhibitor from BSC-1 Cells Closely Related to Platelet Type β Transforming Growth FactorScience, 1984
- Cellular tumorigenicity in nude mice: Correlation with cell growth in semi-solid mediumCell, 1974