Kobayashi S, Patel J, Zhao F, Huang Y, Kobayashi T, Liang Q. Novel Dual-Fluorescent Mitophagy Reporter Reveals a Reduced Mitophagy Flux in Type 1 Diabetic Mouse Heart. J Am Osteopath Assoc 2020;120(7):446–455. doi: https://doi.org/10.7556/jaoa.2020.072.
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Context: Patients with diabetes are susceptible to heart failure. Defective mitochondria can cause cardiac damage. Mitochondrial autophagy or mitophagy is a quality control mechanism that eliminates dysfunctional mitochondria through lysosome degradation. Mitophagy is essential for maintaining a pool of healthy mitochondria for normal cardiac function. However, the effect of diabetes on the functional status of cardiac mitophagy remains unclear.
Objective: To determine and compare cardiac mitophagy flux between diabetic and nondiabetic mice.
Methods: Using a novel dual fluorescent mitophagy reporter termed mt-Rosella, we labeled and traced mitochondrial fragments that are sequestered by the autophagosome and delivered to and degraded in the lysosome.
Results: Mitophagic activity was reduced in high-glucose–treated cardiomyocytes and in the heart tissue of type 1 diabetic mice.
Conclusions: Mitophagy was impaired in the heart of diabetic mice, suggesting that restoring or accelerating mitophagy flux may be a useful strategy to reduce cardiac injury caused by diabetes.
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