Exercise Types: Physical Activity Mitigates Cardiac Aging and Enhances Mitochondrial Function via PKG-STAT3-Opa1
Reka Szekeres1,2, Daniel Priksz1, Mariann Bombicz1
1Department of Pharmacology and Pharmacotherapy, Faculty of General Medicine, University of Debrecen, Debrecen, Hungary.
Aging and Disease
|November 21, 2024
Summary
Forced exercise significantly protects against age-related heart diastolic dysfunction by enhancing the PKG-STAT3-Opa1 pathway and ATP synthase activity, unlike voluntary activity.
Area of Science:
- Cardiovascular Physiology
- Aging Research
- Mitochondrial Biology
Background:
- Age-related cardiac dysfunction is a significant health concern.
- Mitochondrial dysfunction contributes to age-related cardiovascular diseases.
- Physical activity is a known preventive measure against cardiac aging.
Purpose of the Study:
- To compare the effects of long-term voluntary and forced physical activity on cardiac aging.
- To investigate the molecular pathways involved in exercise-induced cardioprotection.
- To utilize an aging rat model with mitochondrial dysfunction.
Main Methods:
- Four groups of rats: young control, aged sedentary, aged voluntary running, aged forced running.
- Echocardiography and histological analysis (perivascular fibrosis) were performed.
- Myocardial protein expression (PKG, STAT3, Opa1) and ATP synthase activity were measured.
Main Results:
- Aged sedentary rats showed diastolic dysfunction and reduced myocardial protein expression/ATP synthase activity.
- Forced running demonstrated superior benefits in echocardiographic parameters and fibrosis reduction compared to voluntary running.
- Forced exercise upregulated PKG, STAT3, and Opa1 expression, restoring ATP synthase activity.
Conclusions:
- Forced exercise, but not voluntary, significantly protects against age-associated diastolic dysfunction.
- The protective effects are mediated by upregulation of the PKG-STAT3-Opa1 axis.
- Enhanced ATP synthase activity contributes to the cardioprotective benefits of forced exercise.
Related Concept Videos
01:37Mitochondria
11.1K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
11.1K
01:17Exercise and Cardiac Output
923
Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be...
Sustained exercise increases the muscles' oxygen demand, which can be...
923
01:45Mitochondrial Membranes
8.7K
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
8.7K
01:46Electron Transport Chain: Complex I and II
11.7K
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
11.7K
01:20Exercise and Cardiovascular Response
737
Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
737
01:26Aging
37
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
37