Mitophagy: A double-edged sword in tumor cell death regulation and therapeutic response
Tong Chu1, Zifeng Huang1, Wenzhe Ma1
1State Key Laboratory of Quality Research in Chinese Medicine & Faculty of Chinese Medicine, Macau University of Science and Technology, Macau SAR, 999078, China; Zhuhai MUST Science and Technology Research Institute, Macau University of Science and Technology, Hengqin Guangdong-Macao In-Depth Cooperation Zone, Guangdong, 519099, China.
Abstract:
Mitophagy, a core mechanism governing cellular homeostasis, plays dual roles in tumorigenesis and therapeutic response by selectively eliminating damaged mitochondria. This review systematically summarizes the molecular mechanisms of mitophagy mediated by receptor-dependent ubiquitin-independent pathways and ubiquitin-dependent pathways, and explores their intricate crosstalk with tumor cell death modalities. Mitophagy dynamically regulates mitochondrial quality to modulate the progression of apoptosis, ferroptosis, necroptosis, immunogenic cell death (ICD), and pyroptosis. Notably, mitophagy exhibits context-dependent roles in tumors: moderate activation suppresses tumor growth by clearing carcinogen-damaged mitochondria, whereas excessive activation may directly induce cell death via functional mitochondrial depletion or synergize with chemotherapy to amplify tumor eradication. Furthermore, this review highlights the challenges in therapeutic strategies targeting the mitophagy-tumor death axis, emphasizing the potential of spatiotemporal-specific regulation and combinatorial interventions across distinct death pathways, thereby providing a theoretical framework for precision oncology.
Insights
Mitophagy, the process of clearing damaged mitochondria, has complex roles in cancer. Understanding its mechanisms is key to developing new cancer therapies.
Area of Science:
- Cellular Biology
- Oncology
- Molecular Mechanisms
Background:
- Mitophagy is crucial for cellular homeostasis, involving the selective removal of damaged mitochondria.
- It plays a dual role in cancer, influencing both tumor development and response to therapy.
Purpose of the Study:
- To systematically review the molecular mechanisms of mitophagy (ubiquitin-dependent and -independent pathways).
- To explore the crosstalk between mitophagy and various tumor cell death modalities.
- To discuss the context-dependent roles of mitophagy in cancer and therapeutic strategies.
Main Methods:
- Systematic review of scientific literature.
- Analysis of molecular pathways involved in mitophagy.
- Exploration of the interplay between mitophagy and cell death processes (apoptosis, ferroptosis, necroptosis, ICD, pyroptosis).
Main Results:
- Mitophagy regulates mitochondrial quality, impacting cancer cell death pathways.
- Its role in tumors is context-dependent: moderate activation can suppress growth, while excessive activation may lead to cell death or enhance chemotherapy.
- Challenges exist in targeting mitophagy for cancer therapy.
Conclusions:
- Mitophagy's intricate relationship with cancer cell death offers therapeutic potential.
- Spatiotemporal regulation and combination therapies targeting mitophagy are promising for precision oncology.
- Further research is needed to fully harness mitophagy for cancer treatment.
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