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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1983 Sep;80(17):5412–5416. doi: 10.1073/pnas.80.17.5412

Alterations in Ca2+ binding by and composition of the cardiac sarcolemmal membrane in chronic diabetes.

G N Pierce, M J Kutryk, N S Dhalla
PMCID: PMC384266  PMID: 6577435

Abstract

Chronic streptozotocin-induced diabetes in rats was associated with a significant loss in the ability of isolated cardiac sarcolemmal membranes to bind Ca2+. Administration of insulin to the diabetic rats normalized the sarcolemmal Ca2+ binding capacity. The content of sialic acid residues, which are considered to represent a superficial Ca2+ pool in sarcolemma, was decreased in preparations from diabetic rats, and this change also was reversible upon insulin treatment of the diabetic rats. Treatment of sarcolemma with neuraminidase decreased Ca2+ binding by 37% in control preparations but had no effect on diabetic preparations. Diphosphatidylglycerol content was decreased but other acidic phospholipids such as phosphatidylinositol and phosphatidylserine, which also bind Ca2+, were not altered during diabetes. An increase in lysophosphatidylcholine and a decrease in phosphatidylethanolamine contents were observed in membranes isolated from diabetic rats. These results suggest that some alterations occur in Ca2+ binding and composition of heart sarcolemma in chronically diabetic rats and may provide further insight into the pathogenesis of diabetic cardiomyopathy.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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