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Updated: Jan 14, 2026
Improved Rodent Model of Myocardial Ischemia and Reperfusion Injury
Published on: March 7, 2022
Inhibition of MARK4 Promotes Mitochondrial Biogenesis by Inducing the Phosphorylation of AMPKα to Reduce Myocardial
Yi Wu1, Sai Wang1, Jingqi Zhang2
1Acute Myocardial Infarction Clinical Research Center, Xianning Central Hospital, 228 Jingui Road, Xianan District, Xianning 437000, Hubei, China.
Purpose:
Mitochondrial biogenesis is an important factor affecting the development of acute myocardial infarction. MAP/MARK4, a member of the MAP serine/threonine kinase (MARK) family, is involved in a variety of physiological processes. The aim of this study was to investigate the role of microtubule affinity-regulating kinase 4 (MARK4) in regulating mitochondrial biogenesis in rats with myocardial infarction.
Methods:
One week after the left anterior descending, coronary artery was ligated to establish a myocardial infarction model, and MARK4 expression was knocked down in mice. In the fifth week, changes in cardiac function and structure, the myocardial BNP and ATP content, mitochondrial ultrastructure, and the mitochondrial membrane potential and reactive oxygen species levels were observed and detected, and the levels of AMPKα and mitochondrial biogenesis- and apoptosis-related proteins were detected using western blot analysis.
Results:
We found that downregulating the expression of MARK4 in rats with myocardial infarction improved cardiac function, alleviated cardiac pathological injury and restored damaged mitochondrial membrane potential, effectively inhibited myocardial apoptosis and restored the myocardial energy supply, and promoted mitochondrial biosynthesis by increasing AMPKα phosphorylation. However, the addition of an AMPKα inhibitor after MARK4 knockdown did not affect mitochondrial biosynthesis in cardiomyocytes, indicating that the inhibition of MARK4 expression may be a promising therapeutic target for myocardial infarction.
Conclusion:
Inhibition of MARK4 expression in rats with myocardial infarction plays a cardioprotective role and promotes mitochondrial biogenesis by promoting AMPKα phosphorylation.
Insights
Downregulating microtubule affinity-regulating kinase 4 (MARK4) in myocardial infarction rats improved cardiac function and promoted mitochondrial biogenesis. This suggests MARK4 inhibition is a potential therapeutic strategy for heart attack treatment.
Area of Science:
- Cardiovascular Biology
- Mitochondrial Biology
- Molecular Medicine
Background:
- Mitochondrial biogenesis is crucial for myocardial infarction development.
- Microtubule affinity-regulating kinase 4 (MARK4) is implicated in various physiological processes.
Purpose of the Study:
- To investigate the role of MARK4 in regulating mitochondrial biogenesis in a rat model of myocardial infarction.
Main Methods:
- Myocardial infarction was induced in rats, followed by MARK4 knockdown.
- Cardiac function, structure, energy supply, mitochondrial dynamics, and apoptosis were assessed.
- Western blot analysis was used to detect key protein levels, including AMPKα phosphorylation.
Main Results:
- MARK4 downregulation improved cardiac function and alleviated pathological injury.
- Mitochondrial membrane potential was restored, apoptosis inhibited, and energy supply enhanced.
- MARK4 knockdown promoted mitochondrial biosynthesis via increased AMPKα phosphorylation.
Conclusions:
- Inhibition of MARK4 expression exerts a cardioprotective effect in myocardial infarction.
- MARK4 plays a role in regulating mitochondrial biogenesis through AMPKα phosphorylation.
- MARK4 inhibition represents a promising therapeutic target for myocardial infarction.
