Mitochondrial translational control in cardiovascular diseases: from mechanisms to therapies.

Mitochondria orchestrate cardiac metabolic homeostasis, and their dysfunction constitutes a fundamental mechanism driving cardiovascular diseases (CVDs). During eukaryotic evolution, most of the mitochondrial genes required for oxidative phosphorylation (OXPHOS) function have been transferred to the nuclear genome, except for 13 genes coding for core subunits of the OXPHOS machinery. The translational regulation of these 13 genes inside mitochondria is precisely and dynamically regulated according to the external environment under diverse metabolic conditions. However, our understanding of these biological processes in CVDs remains limited. This review summarizes recent advances in the regulatory processes of mitochondrial translation, highlighting mitoribosome biogenesis, dynamic tRNA epitranscriptomic modifications, and coupling between translation and inner-membrane assembly. We additionally integrate emerging upstream regulatory mechanisms, including redox and metabolite-sensitive signaling, mitoepigenetic remodeling, and mitochondria-localized microRNA (mitomiR)-mediated control of mitochondrial RNA fate, which collectively tune translational output under stress. Moreover, this review delineates how these processes are dysregulated in major cardiovascular pathologies, including ischemia-reperfusion (I/R) injury, cardiac hypertrophy, heart failure (HF), and inherited cardiomyopathies. Emerging therapeutic strategies designed to restore translational fidelity and throughput, ranging from pharmacological interventions and metabolic tuning to precise mitochondrial gene editing, are also discussed. By repositioning mitochondrial translation from a passive marker of injury to a druggable control node, this review offers a new paradigm for targeting mitochondrial translation to preserve myocardial resilience and treat CVDs.