Pathophysiological Mechanisms of Diabetic Cardiomyopathy: From Metabolic Alterations to Structural Remodeling

Diabetic cardiomyopathy refers to heart muscle dysfunction in diabetic patients, occurring independently of cardiac disease or hypertension. This review investigates the underlying pathophysiological processes of this widely recognized illness. Key factors include insulin resistance, microvascular dysfunction, subcellular abnormalities, metabolic disorders, autonomic dysfunction, changes in the renin-angiotensin-aldosterone system, and adverse immune responses. The generated amount of reactive oxygen species within mitochondria induces oxidative stress, which plays a central role in mediating metabolic disturbances and myocardial injury associated with hyperglycemia. Additionally, DNA damage, activation of poly ADP ribose polymerase, and altered glucose metabolism further exacerbate the condition by activating protein kinase C, increasing hexosamine and polyol flux, and generating advanced glycation end products. The review emphasizes the consequences of these processes, including endoplasmic reticulum stress, mitochondrial dysfunction, and disrupted calcium regulation, resulting in decreased cardiac contractility, cardiomyocyte fibrosis, and apoptosis. It also highlights the impact of cardiac steatosis and lipid metabolism abnormalities on lipotoxic damage to the heart. Diastolic dysfunction is often the first indication of structural and functional heart changes, progressing to systolic impairment. The complexity of cardiac remodeling is discussed, particularly how heart disease can worsen cardiovascular dysfunction in diabetic patients. Understanding these processes is critical for creating tailored treatment strategies to enhance cardiovascular health in diabetics.