MicroRNAs in Cardiovascular Diseases: Molecular Networks of Cellular Homeostasis, Inflammation, and Pathological Remodeling.

Cardiovascular diseases remain the leading cause of morbidity and mortality worldwide, underscoring the need to better define the molecular mechanisms that govern cardiovascular homeostasis and disease progression. Among post-transcriptional regulators, microRNAs have emerged as important modulators of endothelial function, vascular smooth muscle cell plasticity, cardiomyocyte integrity, and cardiac fibroblast activity. This narrative review examines how microRNAs orchestrate molecular networks linking cellular homeostasis to inflammation, oxidative stress, mitochondrial dysfunction, apoptosis, fibrosis, angiogenesis, and pathological remodeling across major cardiovascular cell types. It further discusses how these regulatory programs are reflected in specific cardiovascular diseases, including atherosclerosis, hypertension, acute myocardial infarction, heart failure, and arrhythmias. In addition, the review addresses the growing relevance of circulating and extracellular vesicle-associated microRNAs as candidate biomarkers for diagnosis, prognosis, and disease monitoring, as well as their therapeutic potential through mimics, inhibitors, antagomirs, and emerging delivery systems. Finally, current translation barriers are considered, including methodological heterogeneity, limited tissue specificity, delivery challenges, safety concerns, and the need for large-scale clinical validation. Overall, microRNAs are presented as integrative regulators connecting cardiovascular cell biology with disease mechanisms and clinical applications.