Oxidative Insults and Mitochondrial DNA Mutation Promote Enhanced Autophagy and Mitophagy Compromising Cell Viability in Pluripotent Cell Model of Mitochondrial Disease

Cells - Tập 8 Số 1 - Trang 65
Dar‐Shong Lin1,2, Yu-Wen Huang3, Che‐Sheng Ho2, Pi‐Lien Hung4, Mei‐Hsin Hsu4, Tuan‐Jen Wang5, Tsu‐Yen Wu3, Tsung‐Han Lee3, Zijuan Huang3, Po‐Chun Chang6, Ming‐Fu Chiang7,8,9
1Department of Medicine and Institute of Biomedical Sciences, Mackay Medical College, New Taipei 25245, Taiwan
2Department of Pediatrics, Mackay Memorial Hospital, Taipei 10449, Taiwan
3Department of Medical Research, Mackay Memorial Hospital, Taipei 10449, Taiwan
4Department of Pediatric Neurology, Kaohsiung Chang Gung Memorial Hospital, and Chang Gung University College of Medicine, Kaohsiung 88301, Taiwan
5Department of Laboratory Medicine, Mackay Memorial Hospital, Taipei 10449, Taiwan
6Department of Information Technology, Mackay Memorial Hospital, Taipei 10449, Taiwan
7Department of Neurosurgery, Mackay Memorial Hospital, Taipei 10449, Taiwan
8Graduate Institute of Injury Prevention and Control, Taipei Medical University, Taipei 11031, Taiwan
9Mackay Medicine, Nursing and Management College, Taipei 11260, Taiwan

Tóm tắt

Dysfunction of mitochondria causes defects in oxidative phosphorylation system (OXPHOS) and increased production of reactive oxygen species (ROS) triggering the activation of the cell death pathway that underlies the pathogenesis of aging and various diseases. The process of autophagy to degrade damaged cytoplasmic components as well as dysfunctional mitochondria is essential for ensuring cell survival. We analyzed the role of autophagy inpatient-specific induced pluripotent stem (iPS) cells generated from fibroblasts of patients with mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes (MELAS) with well-characterized mitochondrial DNA mutations and distinct OXPHOS defects. MELAS iPS cells recapitulated the pathogenesis of MELAS syndrome, and showed an increase of autophagy in comparison with its isogenic normal counterpart, whereas mitophagy is very scarce at the basal condition. Our results indicated that the existence of pathogenic mtDNA alone in mitochondrial disease was not sufficient to elicit the degradation of dysfunctional mitochondria. Nonetheless, oxidative insults induced bulk macroautophagy with the accumulation of autophagosomes and autolysosomes upon marked elevation of ROS, overload of intracellular calcium, and robust depolarization of mitochondrial membrane potential, while mitochondria respiratory function was impaired and widespread mitophagy compromised cell viability. Collectively, our studies provide insights into the dysfunction of autophagy and activation of mitophagy contributing to the pathological mechanism of mitochondrial disease.

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Tập 8 Số 1

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