Abstract
Diabetes mellitus increases the risk of cardiomyopathy independently of underlying comorbidities, and heart failure is a major cause of death in diabetic patients. The development of this distinct cardiomyopathy in both type 1 and type 2 diabetes is associated with complex and multifactorial cellular and molecular perturbations. It is widely recognized that cardiac dysfunction in chronic diabetes involves hormonal imbalance, oxidative stress, proteases activation, defects in Ca2+ cycling, and varying degrees of subcellular remodeling of organelles.
Ca2+ -handling abnormalities in diabetic cardiomyocytes have primarily been attributed to changes in the sarcolemmal Na+–Ca2+ exchanger, L-type Ca2+ channel, Na+–K+ ATPase, and Na+–H+ exchanger proteins as well as Ca2+-release channels and Ca2+-pump proteins embedded in the sarcoplasmic reticulum. Intracellular Ca2+ overload has been implicated in the impairment of excitation–contraction coupling as a result of alterations in Ca2+-entry, Ca2+-removal, Ca2+-uptake, and Ca2+-release processes in the diabetic heart. These observations are consistent with the view that defects in Ca2+-handling proteins play a critical role in the pathogenesis of cardiac dysfunction during the development of diabetic cardiomyopathy.
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This work was supported by the St. Boniface Hospital Research Foundation, and A.F.P. Pinto was supported by the National Council for Scientific and Technological Development (CNPq), Brazil.
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Elimban, V., Pinto, A.F.P., Dhalla, N.S. (2014). Calcium-Handling Proteins in Diabetic Cardiomyopathy. In: Turan, B., Dhalla, N. (eds) Diabetic Cardiomyopathy. Advances in Biochemistry in Health and Disease, vol 9. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9317-4_17
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