PMID: 8945632Nov 1, 1996Paper

Ras proteins mediate induction of uncoupling protein, IGF-I, and IGF-I receptor in rat fetal brown adipocyte cell lines

DNA and Cell Biology
A PorrasM Benito

Abstract

Since Ras proteins are essential intermediates of some insulin-like growth factor I (IGF-I)/insulin signaling pathways, we examined whether Ras proteins mediate the IGF-I-induced uncoupling protein expression. Additionally, the role of Ras proteins on IGF-I and IGF-I receptor expression was studied. IGF-I treatment of fetal brown adipocytes cotransfected with inducible gene constructs of SV40 large T antigen (SV40LTag) and a transforming ras gene induced uncoupling protein expression (UCP) in the absence of expression of the transfected genes. The expression of the dexamethasone-inducible transforming ras gene alone or in combination with the Zn-inducible SV40LTag mimicked the IGF-I effect inducing UCP expression and IGF-I did not induce it further. However, the expression of the Zn-inducible SV40LTag did not increase UCP expression in the absence of IGF-I. Expression of the transfected ras oncogene also induced IGF-I and IGF-I receptor mRNAs, whereas expression of SV40LTag did not increase them. Specific IGF-I binding was also specifically increased by expression of the transfected ras oncogene but was not affected by expression of the SV40LTag construct. These results indicate that Ras proteins mediate the IGF-I-induced effec...Continue Reading

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Citations

Oct 6, 2001·Biochemical and Biophysical Research Communications·H GustafssonA Forsby

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