RGD Reference Report - Epinephrine regulation of skeletal muscle glycogen metabolism. Studies utilizing the perfused rat hindlimb preparation. - Rat Genome Database

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Epinephrine regulation of skeletal muscle glycogen metabolism. Studies utilizing the perfused rat hindlimb preparation.

Authors: Dietz, MR  Chiasson, JL  Soderling, TR  Exton, JH 
Citation: Dietz MR, etal., J Biol Chem. 1980 Mar 25;255(6):2301-7.
RGD ID: 2304186
Pubmed: PMID:6244274   (View Abstract at PubMed)

Studies of rat skeletal glycogen metabolism carried out in a perfused hindlimb system indicated that epinephrine activates phosphorylase via the cascade of phosphorylation reactions classically linked to the beta-adrenergic receptor/adenylate cyclase system. The beta blocker propranolol completely blocked the effects of epinephrine on cAMP, cAMP-dependent protein kinase, phosphorylase, and glucose-6-P, whereas the alpha blocker phentolamine was totally ineffective. Omission of glucose from the perfusion medium did not modify the effects of epinephrine. Glycogen synthase activity in control perfused and nonperfused muscle was largely glucose-6-P-dependent (-glucose-6-P/+glucose-6-P activity ratios of 0.1 and 0.2, respectively). Epinephrine perfusion caused a small decrease in the enzyme's activity ratio (0.1 to 0.05) and a large increase in its Ka for glucose-6-P (0.3 to 1.5 mM). This increase in glucose-6-P dependency correlated in time with protein kinase activation and was totally blocked by propranolol and unaffected by phentolamine. Comparison of the kinetics of glycogen synthase in extracts of control and epinephrine-perfused muscle with the kinetics of purified rat skeletal muscle glycogen synthase a phosphorylated to various degrees by cAMP-dependent protein kinase indicated that the enzyme was already substantially phosphorylated in control muscle and that epinephrine treatment caused further phosphorylation of synthase, presumably via cAMP-dependent protein kinase. These data provide a basis for speculation about in vivo regulation of the enzyme.



Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Gys1Ratglycogen metabolic process  IDA  RGD 
PygmRatglycogen metabolic process  IDA  RGD 

Molecular Function

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Gys1Ratalpha-1,4-glucan glucosyltransferase (UDP-glucose donor) activity  IDA  RGD 
Gys1RatD-glucose binding  IDA glucose-6-phosphateRGD 
PygmRatglycogen phosphorylase activity  IDA  RGD 

Objects Annotated

Genes (Rattus norvegicus)
Gys1  (glycogen synthase 1)
Pygm  (glycogen phosphorylase, muscle associated)


Additional Information