Comprehensive Insights Into Mitophagy: Mechanisms, Disease Associations, and Therapeutic Implications
Min Tang, Ikram Outissint, Yijing Chen, Xun Gong
Abstract
Mitophagy, a selective autophagic process, is critical for maintaining mitochondrial quality and cellular homeostasis. It plays a dual role, facilitating cell survival by removing damaged mitochondria or contributing to programmed cell death in certain conditions. Dysregulation of mitophagy is implicated in various diseases, including neurodegenerative disorders, metabolic syndromes, cardiovascular diseases, and cancers. This review examines the key regulatory mechanisms of mitophagy, focusing on pathways such as the PINK1-Parkin, BNIP3/NIX, and FUNDC1 pathways, alongside emerging modulators. Notably, mitophagy is frequently associated with various cell death pathways, such as apoptosis, necroptosis, ferroptosis, and pyroptosis. Primarily, mitophagy functions as a protective mechanism rather than a direct trigger of cell death. It may be connected to cell death when its capacity is overwhelmed rather than actively promoting the process. For instance, impaired mitophagy exacerbates neurodegeneration in Parkinson's and Alzheimer's diseases, while its activation protects against ischemic injury in cardiovascular diseases. In cancer, mitophagy is paradoxical, as it either inhibits tumor growth or promotes survival under stress. Therapeutic interventions targeting mitophagy, including small-molecule modulators, show promise in preclinical studies; however, they require further clinical validation. Advancements in imaging techniques, single-cell omics, and high-throughput screenings are anticipated to deepen our understanding of mitophagy dynamics and therapeutic potential. This review highlights mitophagy as a pivotal target for treating diseases associated with mitochondrial dysfunction, providing insights into innovative therapeutic strategies.