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. 1989 Oct;9(10):4312–4322. doi: 10.1128/mcb.9.10.4312

Possible involvement of normal p21 H-ras in the insulin/insulinlike growth factor 1 signal transduction pathway.

B M Burgering 1, A J Snijders 1, J A Maassen 1, A J van der Eb 1, J L Bos 1
PMCID: PMC362512  PMID: 2555688

Abstract

Expression of a mutant H-ras gene confers a transformed phenotype to rat-1 fibroblasts which is basically independent of exogenous growth factors (GFs). Rat-1 cells induced to express high levels of the normal H-ras gene were also found to display a transformed phenotype. In contrast to cells expressing mutant H-ras, these cells were dependent on GFs. We used this difference in GF dependence to analyze a possible involvement of exogenous GFs in H-ras function. Compared with untransformed rat-1 cells, cells overexpressing normal H-ras displayed an elevated response toward insulinlike growth factor 1 (IGF-1), insulin, and bombesin and an increased sensitivity toward phosphatidic acids. It was found that 8-bromo-cyclic AMP inhibited the responses to all GFs in rat-1 cells but had no effect on mutant-H-ras-transformed cells. In cells overexpressing normal H-ras, 8-bromo-cyclic AMP inhibited the responses to all GFs except those to insulin and IGF-1. This implies that overexpression of normal H-ras in the presence of insulin/IGF-1 is functionally similar to the expression of mutant H-ras, since mutant H-ras can circumvent this block by itself. These and other results strongly suggest a functional linkage between insulin/IGF-1 and normal p21 H-ras.

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Selected References

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