| Effect of dexamethasone on insulin secretion: examination of underlying mechanisms. | |
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MedLine Citation:
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PMID: 20350918 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Objective: To study the mechanism of increased insulin secretion in response to short-term administration of dexamethasone.Methods: Male Wistar rats were injected intraperitoneally with dexamethasone (dexamethasone; 200 mcg/kg body weight per day) or saline for 3 consecutive days. Insulin secretion in response to glucose, ionomycin, and KCl was quantified in islets isolated from the animals, and the amount of glucokinase was measured by Western blot.Results: Dexamethasone-treated animals had 1.18-fold higher fasting blood glucose concentration and 6.5-fold increase in fasting serum insulin concentration compared with findings from animals injected with saline. Compared with islets isolated from control rats, islets from dexamethasone-treated rats secreted more insulin at 60 minutes in response to 5.5 mM glucose (416.4 vs 115.6 fmoles/10 islets, P = .011) and in response to 16.6 mM glucose (985.5 vs 520.6 fmoles/10 islets, P = .014); no change in insulin secretion was observed at 10 minutes. Insulin secretion from islets of dexamethasone-treated rats and control rats was not differentially augmented in response to either ionomycin or potassium chloride. Glucokinase expression was not altered by treatment with dexamethasone.Conclusions: Augmentation of insulin secretion in response to glucose in the pancreatic islets from dexamethasone-treated rats is preserved in islets studied in vitro. The increase in glucose-stimulated insulin secretion appears to be mediated by steps upstream to β-cell membrane depolarization and the attended increase in intracellular calcium in the signaling pathway of insulin secretion. |
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Authors:
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Ajay Sood; Faramarz Ismail-Beigi |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Endocrine practice : official journal of the American College of Endocrinology and the American Association of Clinical Endocrinologists Volume: 16 ISSN: 1934-2403 ISO Abbreviation: Endocr Pract Publication Date: 2010 Sep-Oct |
Date Detail:
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Created Date: 2011-03-01 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9607439 Medline TA: Endocr Pract Country: United States |
Other Details:
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Languages: eng Pagination: 763-9 Citation Subset: IM |
Affiliation:
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Division of Clinical and Molecular Endocrinology, Department of Medicine, Case Western Reserve University, Cleveland, Ohio. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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