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Effects of streptozotocin-induced diabetes on connexin43 mRNA and protein expression in ventricular muscle.

Abstract：

:Abnormal QT prolongation with the associated arrhythmias is a significant predictor of mortality in diabetic patients. Gap junctional intercellular communication allows electrical coupling between heart muscle cells. The effects of streptozotocin (STZ)-induced diabetes mellitus on the expression and distribution of connexin 43 (Cx43) in ventricular muscle have been investigated. Cx43 mRNA expression was measured in ventricular muscle by quantitative PCR. The distribution of total Cx43, phosphorylated Cx43 (at serine 368) and non-phosphorylated Cx43 was measured in ventricular myocytes and ventricular muscle by immunocytochemistry and confocal microscopy. There was no significant difference in Cx43 mRNA between diabetic rat ventricle and controls. Total and phosphorylated Cx43 were significantly increased in ventricular myocytes and ventricular muscle and dephosphorylated Cx43 was not significantly altered in ventricular muscle from diabetic rat hearts compared to controls. Disturbances in gap junctional intercellular communication, which in turn may be attributed to alterations in balance between total, phosphorylated and dephosporylated Cx43, might partly underlie prolongation of QRS and QT intervals in diabetic heart.

journal_name

Mol Cell Biochem

journal_title

Molecular and cellular biochemistry

authors

Howarth FC,Chandler NJ,Kharche S,Tellez JO,Greener ID,Yamanushi TT,Billeter R,Boyett MR,Zhang H,Dobrzynski H

doi

10.1007/s11010-008-9883-5

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

105-14

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

319

pub_type

杂志文章

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