Linked Life Data

207737

Source:http://linkedlifedata.com/resource/pubmed/id/207737

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pubmed-article:207737pubmed:abstractTextThe effects of endogenous and exogenous hyperglucagonemia on the specific binding of glucagon to hepatocyte receptors was studied, as was the response of cAMP to glucagon. In streptozotocin diabetic rats, blood glucose and plasma glucagon increased and plasma insulin decreased as compared with controls. Insulin treatment in diabetic rats restored blood glucose and plasma glucagon toward normal and elevated plasma insulin. Specific binding of (125)I-glucagon to isolated hepatocytes (10(6) cells) decreased in diabetic rats (8.17+/-0.38%) compared to controls (14.05+/-0.87%) and was restored by insulin treatment (12.25+/-0.93%). Specific binding of (125)I-insulin in controls was 7.30+/-10.16%; it increased in diabetic rats to 12.50+/-0.86%, and decreased in diabetic rats after insulin treatment (9.08+/-0.87%). Scatchard analysis and the competition plots of the data indicate that decreased glucagon binding and increased insulin binding in diabetes were due to change in the number of receptors rather than a change in their affinity. Hepatocyte cAMP response to glucagon (0.25-5.0 ng/ml) was almost abolished in diabetic rats and was restored with insulin treatment. Specific glucagon binding by hepatocytes from chronically hyperglucagonemic (glucagon injected) rats was decreased (P < 0.005) to 8.76+/-0.61% compared with controls (13.20+/-0.74%) and acutely hyperglucagonemic animals (13.53+/-1.33%). The decreased binding was associated with a 70% decrease in hepatocyte cAMP response to glucagon compared with a normal response in acutely hyperglucagonemic rats.These data appear to support the concept of receptor regulation by ambient hormone level. In both endogenous and exogenous hyperglucagonemia, however, there was a disproportionately large decrease in cAMP response to glucagon compared to the decrease in glucagon binding.lld:pubmed
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pubmed-article:207737pubmed:articleTitleDecreased glucagon receptors in diabetic rat hepatocytes. Evidence for regulation of glucagon receptors by hyperglucagonemia.lld:pubmed
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