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• W1534853312 abstract "A recent study showed that cAMP analogs lowered cAMP levels in rat hepatocytes (Corbin, J.D., Beebe, S.J., and Blackmore, P.F. (1985) J. Biol. Chem. 260, 8731-8735). The present work demonstrates that cAMP analogs also lowered cAMP in a rapid, concentration-dependent manner in heart and fat cells. In order to determine if the cAMP-dependent protein kinase mediated this effect, techniques were developed to assay the protein kinase activity ratio in hepatocytes treated with cAMP analogs. The activation of protein kinase and phosphorylase in hepatocytes by 8-pCl phi S-cAMP (where 8-pCl phi S- indicates 8-parachlorothiophenyl-) was concentration-dependent and occurred in parallel to proportionate decreases in cAMP. More than 20% of the cAMP binding sites on the protein kinase were unoccupied at concentrations of 8-pCl phi S-cAMP that produced maximal cAMP lowering. Thus, the possibility that 8-pCl phi S-cAMP lowered cAMP by displacing it from protein kinase binding sites, making it available for hydrolysis, seemed unlikely. In adipocytes, the lowering of cAMP by 8-pCl phi S-cAMP occurred in parallel with increases in lipolysis and activation of low Km phosphodiesterase, suggesting that the phosphodiesterase was responsible for the cAMP lowering. Further evidence for this assertion was the finding that in hepatocytes preloaded with low concentrations of 8-pCl phi S-cAMP, glucagon lowered 8-pCl phi S-cAMP by about 50%, an amount similar to the cAMP lowering observed with 8-pCl phi S-cAMP treatment. The results were consistent with a cAMP-dependent protein kinase-catalyzed activation of a phosphodiesterase and suggested that 8-pCl phi S-cAMP-mediated hydrolysis of cAMP mimicked a physiologically significant response. The observation of this phenomenon in several tissues further suggested that it may be a general mechanism for dampening and terminating the hormonal signal through accelerated degradation of cAMP." @default.
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• W1534853312 date "1987-01-01" @default.
• W1534853312 modified "2023-09-30" @default.
• W1534853312 title "Short-term feedback regulation of cAMP by accelerated degradation in rat tissues." @default.
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• W1534853312 doi "https://doi.org/10.1016/s0021-9258(19)75931-6" @default.
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