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pubmed-article:18715473pubmed:abstractTextThe role of hyperglycaemia in the pathogenesis of hypotension in diabetic disorders was investigated using the changes in cardiac M(2)-muscarinic receptor (M(2)-mAChR) gene expression in type-1-like diabetic rats and cultured cardiomyocytes. Blood pressure was markedly decreased in diabetic rats following the intravenous injection of streptozotocin (STZ) for 8 weeks. Also, the baroreflex sensitivity (Delta HR/Delta BP), as measured by the changes in heart rate (Delta HR) and mean blood pressure (Delta BP) 1 min after the intravenous injection of phenylephrine (10 microg/kg), was significantly increased. Arecaidine propargyl ester (APE), a M(2)-mAChR agonist produced a marked reduction in heart rate in these diabetic rats. Normalization of plasma glucose in diabetic rats using insulin (0.5 IU) or phlorizin (1 mg/kg) injection attenuated the blood pressure reduction and reversed the mRNA and protein levels of cardiac M(2)-mAChR. A high concentration of glucose (20 mmol/l) directly influenced the increase in gene expression of M(2)-mAChR in the H9c2 cardiac cell line. Hyperglycaemia induced an increase in cardiac M(2)-mAChR gene expression, suggesting a role in the pathogenesis of hypotension in diabetic disorders.lld:pubmed
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pubmed-article:18715473pubmed:authorpubmed-author:LiuI-MinIMlld:pubmed
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pubmed-article:18715473pubmed:dateRevised2011-11-17lld:pubmed
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pubmed-article:18715473pubmed:articleTitleRole of hyperglycaemia in the pathogenesis of hypotension observed in type-1 diabetic rats.lld:pubmed
pubmed-article:18715473pubmed:affiliationDepartment of Pharmacy, Tajen University, Yen-Pou, Ping Tung Shien, Taiwan.lld:pubmed
pubmed-article:18715473pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:18715473pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed