J Biol Chem. 1985 Dec 25;260(30):16418-23.

Effects of insulin alone on the accumulation of a specific mRNA in rat hepatoma cells.

Abstract

Experiments were conducted to investigate the action of insulin alone on the induction of a specific mRNA referred to as p33. In 24-h serum-deprived rat liver hepatoma cells (H4) grown in monolayer cultures, insulin induced a 3-fold increase in the levels of p33 mRNA within 30 min, and a maximum 10-fold increase was observed by 1 h. The effects of insulin were evident at concentrations as low as 10(-12) M and were maximal at 0.5-1 X 10(-8) M. The effect of insulin was specific, since the level of mRNA for the histocompatibility complex, H2d, was unaffected by insulin. The increase in p33 mRNA was not due to an effect of insulin on the stabilization of mRNA, since insulin did not alter the half-life of this message. In addition, two different RNA synthesis inhibitors blocked the stimulation of p33 mRNA production by insulin. These data suggest that insulin may specifically stimulate the synthesis of p33 mRNA which results in an increased accumulation of total cellular p33 mRNA.

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