Rapid response of protein synthesis to insulin in 3T3 cells: Effects of protein kinase C depletion and differences from the response to serum repletion |
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Authors: | John E. Hesketh Gillian P. Campbell Peter J. Reeds |
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Affiliation: | (1) Rowett Research Institute, AB2 9SB Bucksburn, Aberdeen |
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Abstract: | Quiescent 3T3 cells grown in media containing 4% foetal calf serum showed different responses to insulin and to serum repletion (to 12%). Insulin stimulated protein synthesis within 1 h and this early response was insensitive to actinomycin D. The later insulin response showed progressive sensitivity to actinomycin D. The serum response was slower, not occurring until 1 h, and was inhibited by actinomycin D. Depletion of cell protein kinase C by pre-treatment with phorbol ester caused a total block of the immediate response to insulin but had little effect on the response to serum or the later response to insulin. Acute phorbol ester treatment stimulated protein synthesis. |
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Keywords: | insulin serum protein synthesis protein kinase C 3T3 fibroblasts signal transduction |
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