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Mitochondrial Dynamics Regulation in Skin Fibroblasts from Mitochondrial Disease Patients
Takeshi Tokuyama, Asei Hirai, Isshin Shiiba1
1Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan.
Abstract:
Mitochondria are highly dynamic organelles that constantly fuse, divide, and move, and their function is regulated and maintained by their morphologic changes. Mitochondrial disease (MD) comprises a group of disorders involving mitochondrial dysfunction. However, it is not clear whether changes in mitochondrial morphology are related to MD. In this study, we examined mitochondrial morphology in fibroblasts from patients with MD (mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) and Leigh syndrome). We observed that MD fibroblasts exhibited significant mitochondrial fragmentation by upregulation of Drp1, which is responsible for mitochondrial fission. Interestingly, the inhibition of mitochondrial fragmentation by Drp1 knockdown enhanced cellular toxicity and led to cell death in MD fibroblasts. These results suggest that mitochondrial fission plays a critical role in the attenuation of mitochondrial damage in MD fibroblasts.
Insights
Mitochondrial fission, driven by Drp1, fragments mitochondria in patients with mitochondrial disease (MD). Inhibiting this process worsens cell damage, suggesting fission protects against MD progression.
Area of Science:
- Cell Biology
- Mitochondrial Biology
- Neuroscience
Background:
- Mitochondria are dynamic organelles crucial for cellular function, with morphology regulated by fusion and fission.
- Mitochondrial diseases (MD) involve dysfunction but the link to morphology remains unclear.
- Key MD subtypes include mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) and Leigh syndrome.
Purpose of the Study:
- To investigate the relationship between mitochondrial morphology and disease in patient-derived fibroblasts.
- To determine the role of mitochondrial fission in the context of mitochondrial disease.
Main Methods:
- Examined mitochondrial morphology in fibroblasts from patients with MELAS and Leigh syndrome.
- Assessed the role of dynamin-related protein 1 (Drp1) in mitochondrial fission.
- Utilized Drp1 knockdown to inhibit mitochondrial fragmentation.
Main Results:
- Fibroblasts from MD patients showed significant mitochondrial fragmentation.
- This fragmentation was associated with upregulation of Drp1, the key mediator of mitochondrial fission.
- Inhibiting Drp1-mediated fission via knockdown exacerbated cellular toxicity and induced cell death in MD fibroblasts.
Conclusions:
- Mitochondrial fission, regulated by Drp1, is a significant feature in MD fibroblasts.
- Mitochondrial fission plays a protective role by attenuating cellular damage in mitochondrial disease.
- These findings highlight the critical role of mitochondrial dynamics in mitigating disease pathology.
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