The activation of p38 MAPK by the beta-adrenergic agonist isoproterenol in rat epididymal fat cells.
Here we report that the beta-adrenergic agonist isoproterenol increases the activity of the stress-activated kinase p38 MAPK over 10-fold in freshly isolated rat epididymal fat cells. Stimulation of the kinase was rapid, sustained for at least 60 min and sensitive to the specific p38 MAPK inhibitor, SB 203580. Half-maximal stimulation of p38 MAPK by isoproterenol occurred at 13 nM isoproterenol. The cell permeable cyclic AMP analogue, chlorophenylthio-cyclic AMP increased p38 MAPK activity to a similar extent to isoproterenol, suggesting that the effect of the beta-adrenergic agonist is mediated via increases in the activity of cyclic-AMP dependent protein kinase. Although it had little or no effect on the activity of c-Jun N-terminal kinase, isoproterenol and a number of other treatments which activated p38 MAPK were found to stimulate AMP-activated protein kinase in fat cells. Activation of AMPK and p38 MAPK were not, however, found to be directly linked.
Moule
S K
SK
Department of Biochemistry, School of Medical Sciences, Bristol, UK. s.k.moule@bris.ac.uk
Denton
R M
RM
D055372:AMP-Activated Protein Kinases; D017667:Adipocytes / Q000187:drug effects* / Q000201:enzymology; D000318:Adrenergic beta-Agonists / Q000494:pharmacology*; D000818:Animals; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000378:metabolism*; D000242:Cyclic AMP / Q000378:metabolism*; D004789:Enzyme Activation; D004822:Epididymis / Q000201:enzymology; D007545:Isoproterenol / Q000494:pharmacology*; D008297:Male; D020928:Mitogen-Activated Protein Kinases; D009097:Multienzyme Complexes / Q000378:metabolism; D011494:Protein Kinases / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases; D051381:Rats; D017208:Rats, Wistar; D048051:p38 Mitogen-Activated Protein Kinases
D000318:Adrenergic beta-Agonists; D009097:Multienzyme Complexes; D000242:Cyclic AMP; D011494:Protein Kinases; D017346:Protein Serine-Threonine Kinases; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D055372:AMP-Activated Protein Kinases; D007545:Isoproterenol