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MICU1 Alleviates Diabetic Cardiomyopathy Through Mitochondrial Ca2+-Dependent Antioxidant Response
Lele Ji1, Fengzhou Liu2, Zhe Jing3
1State Key Laboratory of Cancer Biology and Experimental Teaching Center of Basic Medicine, Fourth Military Medical University, Xi'an, China.
Abstract:
Diabetic cardiomyopathy is a major cause of mortality in patients with diabetes, but specific strategies for preventing or treating diabetic cardiomyopathy have not been clarified yet. MICU1 is a key regulator of mitochondrial Ca2+ uptake, which plays important roles in regulating mitochondrial oxidative phosphorylation and redox balance. To date, however, the significance of MICU1 in diabetic hearts has not been investigated. Here, we demonstrate that MICU1 was downregulated in db/db mouse hearts, which contributes to myocardial apoptosis in diabetes. Importantly, the reconstitution of MICU1 in diabetic hearts significantly inhibited the development of diabetic cardiomyopathy, as evidenced by enhanced cardiac function and reduced cardiac hypertrophy and myocardial fibrosis in db/db mice. Moreover, our in vitro data show that the reconstitution of MICU1 inhibited the apoptosis of cardiomyocytes, induced by high glucose and high fat, through increasing mitochondrial Ca2+ uptake and subsequently activating the antioxidant system. Finally, our results indicate that hyperglycemia and hyperlipidemia induced the downregulation of MICU1 by inhibiting Sp1 expression in diabetic cardiomyocytes. Collectively, our findings provide the first direct evidence that upregulated MICU1 preserves cardiac function in diabetic db/db mice, suggesting that increasing the expression or activity of MICU1 may be a pharmacological approach to ameliorate cardiomyopathy in diabetes.
Insights
Mitochondrial calcium uptake 1 (MICU1) downregulation worsens diabetic cardiomyopathy. Restoring MICU1 in diabetic hearts improves cardiac function and reduces damage, offering a potential therapeutic strategy for diabetes-related heart disease.
Area of Science:
- Cardiovascular Biology
- Mitochondrial Physiology
- Metabolic Disease Research
Background:
- Diabetic cardiomyopathy (DCM) is a significant cause of mortality in diabetes patients.
- Effective prevention and treatment strategies for DCM remain unclear.
- MICU1 regulates mitochondrial calcium uptake, impacting oxidative phosphorylation and redox balance, but its role in diabetic hearts is unknown.
Purpose of the Study:
- To investigate the role of MICU1 in diabetic cardiomyopathy.
- To determine if MICU1 modulation can ameliorate DCM.
- To elucidate the molecular mechanisms underlying MICU1's function in diabetic cardiomyocytes.
Main Methods:
- Utilized *db/db* mouse model of diabetes.
- Assessed cardiac function, hypertrophy, and fibrosis.
- Performed in vitro studies on cardiomyocytes exposed to high glucose and high fat.
- Investigated mitochondrial calcium uptake and antioxidant system activation.
- Examined the effect of hyperglycemia and hyperlipidemia on MICU1 and Sp1 expression.
Main Results:
- MICU1 expression was downregulated in *db/db* mouse hearts, correlating with myocardial apoptosis.
- Reconstitution of MICU1 in diabetic hearts improved cardiac function and reduced cardiac hypertrophy and fibrosis.
- In vitro, MICU1 reconstitution inhibited high glucose/high fat-induced cardiomyocyte apoptosis by enhancing mitochondrial Ca2+ uptake and activating the antioxidant system.
- Hyperglycemia and hyperlipidemia downregulated MICU1 by inhibiting Sp1 expression in cardiomyocytes.
Conclusions:
- MICU1 downregulation contributes to myocardial apoptosis and diabetic cardiomyopathy.
- Upregulating MICU1 preserves cardiac function in diabetic *db/db* mice.
- MICU1 represents a potential therapeutic target for ameliorating diabetic cardiomyopathy.
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