Time sequence of changes in the responsiveness of glycogen breakdown to adrenergic agonists in perfused liver of rats with insulin-induced hypoglycemia
Braz. j. med. biol. res
;
33(7): 805-13, July 2000. tab, graf
Article
in English
| LILACS
| ID: lil-262680
ABSTRACT
The time-course changes of the responsiveness of glycogen breakdown to a- and Beta-adrenergic agonists during insulin-induced hypoglycemia (IIH) were investigated. Blood glucose levels were decreased prior to the alteration in the hepatic responsiveness to adrenergic agonists. The activation of hepatic glucose production and glycogenolysis by phenylephrine (2 µM) and isoproterenol (20 µM) was decreased in IIH. The changes in the responsiveness of glycogen catabolism were first observed for isoproterenol and later for phenylephrine. Hepatic ß-adrenergic receptors showed a higher degree of adrenergic desensitization than did a-receptors. Liver glycogen synthase activity, glycogen content and the catabolic effect of dibutyryl cyclic AMP (the Beta-receptor second messenger) were not affected by IIH.
Full text:
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Index:
LILACS (Americas)
Main subject:
Bucladesine
/
Adrenergic Agonists
/
Hypoglycemia
/
Liver
/
Liver Glycogen
Limits:
Animals
Language:
English
Journal:
Braz. j. med. biol. res
Journal subject:
Biology
/
Medicine
Year:
2000
Type:
Article
/
Project document
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