Abstract
According to the International Diabetes Federation the number of people between the ages of 20 and 79 years diagnosed with diabetes mellitus is projected to reach 380 million worldwide by 2025. Cardiovascular disease, including heart failure, is the major cause of death in patients with diabetes. A contributing factor to heart failure in such patients is the development of diabetic cardiomyopathy—a clinical myocardial condition distinguished by ventricular dysfunction that can present independently of other risk factors such as hypertension or coronary artery disease. This disorder has been associated with both type 1 and type 2 diabetes, and is characterized by early-onset diastolic dysfunction and late-onset systolic dysfunction. The development of diabetic cardiomyopathy and the cellular and molecular perturbations associated with the pathology are complex and multifactorial. Hallmark mechanisms include abnormalities in regulation of calcium homeostasis, and associated abnormal ventricular excitation–contraction coupling, metabolic disturbances, and alterations in insulin signaling. An emerging concept is that disruptions in calcium homeostasis might be linked to diminished insulin responsiveness. An understanding of the cellular effect of these abnormalities on cardiomyocytes should be useful in predicting the maladaptive cardiac structural and functional consequences of diabetes.
Key Points
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Diabetic cardiomyopathy is defined as a phenotypic myocardial disease distinguished by ventricular dysfunction independent of hypertension or coronary heart disease
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Diabetic cardiomyopathy is associated with both type 1 and type 2 diabetes mellitus and is characterized by both systolic and diastolic dysfunction
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Pathogenic factors contributing to the development of diabetic cardiomyopathy include hyperglycemia and elevated fatty acid levels
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Abnormalities in Ca2+ handling and ventricular excitation-contraction coupling are clearly major contributors to cardiac dysfunction in diabetes, which shows considerable similarities to abnormalities seen in hypertrophic failing hearts
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Myocardial insulin resistance is associated with abnormal cardiomyocyte excitation-contraction coupling in both type 1 and type 2 diabetes, but a definitive link has not been established
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Management of traditional risk factors, lifestyle control and insulin treatment might be effective in preventing or delaying the progression of diabetic cardiomyopathy; however, myocardial gene delivery is being pursued as a new therapeutic modality in patients with heart failure
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Acknowledgements
This study was supported in part by the following grants from the National Institutes of Health: R01 HL078691; HL057263; HL071763; HL080498; HL083156; K01 HL076659 (DL); HL078731 (RJH, DL); and HL66895 (AJD). This work was also supported by a Leducq Transatlantic Network grant (RJH) and a grant from the American Diabetes Association (7-04-RA-23; AJD).
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RJ Hajjar is a stockholder for and a patent holder/applicant for both Celladon and Nanocor. The other authors declared no competing interests.
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Lebeche, D., Davidoff, A. & Hajjar, R. Interplay between impaired calcium regulation and insulin signaling abnormalities in diabetic cardiomyopathy. Nat Rev Cardiol 5, 715–724 (2008). https://doi.org/10.1038/ncpcardio1347
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DOI: https://doi.org/10.1038/ncpcardio1347
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