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Updated: Dec 8, 2025
Improved Rodent Model of Myocardial Ischemia and Reperfusion Injury
Published on: March 7, 2022
SIRT1/SIRT3 Modulates Redox Homeostasis during Ischemia/Reperfusion in the Aging Heart
Jingwen Zhang1,2, Di Ren2, Julia Fedorova2
1College of Life Sciences, Shandong Normal University, Jinan 250014, China.
Insights
Ischemia/reperfusion injury in aging hearts stems from mitochondrial reactive oxygen species (ROS). Sirtuin proteins (SIRT1, SIRT3) protect against this damage by regulating metabolism and inflammation.
Area of Science:
- Cardiovascular Science
- Aging Research
- Mitochondrial Biology
Background:
- Ischemia/reperfusion (I/R) injury is a major cause of cardiovascular disease mortality.
- Aging exacerbates I/R injury by impairing cardiac function and increasing reactive oxygen species (ROS) production.
- Mitochondrial dysfunction and disturbed redox homeostasis are key contributors to age-related I/R damage.
Purpose of the Study:
- To review cellular and functional changes in aging hearts during I/R.
- To identify mitochondria as a primary source of ROS in aged hearts during I/R.
- To highlight the protective roles of Sirtuin1 (SIRT1) and Sirtuin3 (SIRT3) in mitigating I/R injury.
Main Methods:
- Literature review focusing on I/R injury in aging cardiovascular systems.
- Analysis of the role of mitochondria in ROS generation during I/R.
- Examination of sirtuin protein function in cardiac protection and redox homeostasis.
Main Results:
- Aging hearts exhibit increased susceptibility to I/R injury due to enhanced ROS production.
- Mitochondria are identified as the principal source of damaging ROS in aged hearts under I/R stress.
- Sirtuin proteins SIRT1 and SIRT3 demonstrate protective effects against I/R injury by modulating metabolism and inflammation.
Conclusions:
- Mitochondrial ROS significantly contribute to I/R injury in aging hearts.
- SIRT1 and SIRT3 are crucial for maintaining cardiac function and redox balance during I/R stress in aged individuals.
- Targeting sirtuin pathways may offer therapeutic strategies for age-related cardiovascular diseases.
Abstract:
Ischemia/reperfusion (I/R) injury is the central cause of global death in cardiovascular diseases, which is characterized by disorders such as angina, stroke, and peripheral vascular disease, finally causing severe debilitating diseases and death. The increased rates of morbidity and mortality caused by I/R are parallel with aging. Aging-associated cardiac physiological structural and functional deterioration were found to contribute to abnormal reactive oxygen species (ROS) production during I/R stress. Disturbed redox homeostasis could further trigger the related signaling pathways that lead to cardiac irreversible damages with mitochondria dysfunction and cell death. It is notable that sirtuin proteins are impaired in aged hearts and are critical to maintaining redox homeostasis via regulating substrate metabolism and inflammation and thus preserving cardiac function under stress. This review discussed the cellular and functional alterations upon I/R especially in aging hearts. We propose that mitochondria are the primary source of reactive oxygen species (ROS) that contribute to I/R injury in aged hearts. Then, we highlight the cardiomyocyte protection of the age-related proteins Sirtuin1 (SIRT1) and Sirtuin1 (SIRT3) in response to I/R injury, and we discuss their modulation of cardiac metabolism and the inflammatory reaction that is involved in ROS formation.
