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Publication : Control of the translational regulators PHAS-I and PHAS-II by insulin and cAMP in 3T3-L1 adipocytes.

First Author  Lin TA Year  1996
Journal  J Biol Chem Volume  271
Issue  47 Pages  30199-204
PubMed ID  8939971 Mgi Jnum  J:51748
Mgi Id  MGI:1326813 Doi  10.1074/jbc.271.47.30199
Citation  Lin TA, et al. (1996) Control of the translational regulators PHAS-I and PHAS-II by insulin and cAMP in 3T3-L1 adipocytes. J Biol Chem 271(47):30199-204
abstractText  The eukaryotic initiation factor 4E (eIF-4E)-binding proteins PHAS-I and PHAS-II were found to have overlapping but different patterns of expression in tissues. Both PHAS proteins were expressed in 3T3-L1 adipocytes, in which insulin stimulated their phosphorylation, promoted dissociation of PHAS.eIF-4E complexes, and decreased the ability of both to bind exogenous eIF-4E. The effects of insulin were attenuated by rapamycin and wortmannin, two agents that block activation of p70(S6K). Unlike PHAS-I, PHAS-II was readily phosphorylated by cAMP-dependent protein kinase in vitro; however, the effects of insulin on both PHAS proteins were attenuated by agents that increase intracellular cAMP, by cAMP derivatives, and by phosphodiesterase inhibitors. These agents also markedly inhibited the activation of p70(S6K). In summary, our results indicate that PHAS-I and -II are controlled by the mammalian target of rapamycin and p70(S6K) signaling pathway and that in 3T3-L1 adipocytes this pathway is inhibited by increased cAMP.
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