Microvascular Adaptations to Exercise: Protective Effect of PGC-1 Alpha
Andrew O Kadlec1,2,3, Chad Barnes4, Matthew J Durand3,5
1Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
American Journal of Hypertension
|November 16, 2017
Summary
Exercise training enhances blood vessel function via PGC-1α, protecting against cardiovascular disease. Activating PGC-1α in overweight individuals mimics these benefits, improving vascular health.
Area of Science:
- Cardiovascular Physiology
- Molecular Biology
- Exercise Science
Background:
- Sedentary behavior and obesity are significant risk factors for cardiovascular disease.
- Regular physical activity offers cardiovascular protection, but the underlying mechanisms are not fully understood.
- Peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α) is implicated in exercise training responses.
Purpose of the Study:
- To investigate the role of PGC-1α in maintaining arteriolar dilation in athletes.
- To determine if PGC-1α deficiency compromises vascular function.
- To examine if PGC-1α activation can induce an exercise-like vascular phenotype in overweight/obese individuals.
Main Methods:
- Isolated arterioles from exercise-trained (ET) and overweight/obese subjects were studied.
- Vessel diameter changes in response to flow and vasodilator inhibition were measured.
- PGC-1α was manipulated using siRNA and pharmacological activation (alpha-lipoic acid).
Main Results:
- ET microvessels showed robust dilation resistant to combined nitric oxide, prostaglandin, and hydrogen peroxide inhibition.
- Loss of PGC-1α made ET vessels susceptible to hydrogen peroxide blockade.
- PGC-1α activation in overweight/obese subjects increased arteriolar resistance and protected against pressure-induced stress.
Conclusions:
- Microvascular adaptations to exercise training are mediated by PGC-1α.
- PGC-1α activation confers protection against acute vascular stress in overweight and obese individuals.
- Targeting PGC-1α may offer therapeutic potential for cardiovascular health in sedentary populations.
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