Aberrant myocardial calcium cycling: pathogenic mechanisms and targeted therapeutics for heart failure.

Cardiovascular diseases rank as the global primary cause of mortality. Heart failure (HF) represents a progressive cardiac syndrome triggered by structural or functional myocardial damage that compromises ventricular systolic output. Intracellular calcium homeostasis underpins cardiomyocyte excitation-contraction coupling. Calcium overload and dysregulated calcium handling act as central pathogenic forces driving HF progression. Sympathetic β1-adrenergic receptor (β1-AR) and parasympathetic M2 muscarinic acetylcholine receptor (M2-AChR) coordinate dual regulatory signaling to control cardiac calcium turnover, alongside key modulators including L-type calcium channel (LTCC), ryanodine receptor 2 (RyR2), SERCA2a, cardiac troponin C (cTnC), Na+/Ca2+ exchanger 1 (NCX1) and mitochondrial permeability transition pore (MPTP). This review outlines physiological calcium cycling and systematically characterizes HF-related functional defects of calcium regulatory machinery from three layers: calcium release, sarcoplasmic reticulum calcium reuptake and auxiliary calcium mediators. We further discuss the underlying mechanisms of calcium-targeted pharmaceuticals and gene therapeutic approaches, while addressing translational bottlenecks limiting single-target interventions. Restoration of balanced cytosolic calcium cycling holds therapeutic potential to reverse pathological myocardial remodeling in HF.