Antioxidant and Adaptative Response Mediated by Nrf2 during Physical Exercise

Area of Science:

• Molecular Biology
• Exercise Physiology
• Cellular Biology

Background:

• Oxidative stress (OS) arises from elevated reactive oxygen species (ROS) that overwhelm endogenous and exogenous antioxidant defenses.
• Nuclear factor erythroid 2-related factor 2 (Nrf2) is a key transcription factor regulating the cellular antioxidant and cytoprotective response.
• Physical exercise inherently increases ROS production, potentially triggering the Nrf2 pathway if antioxidant capacity is insufficient.

Purpose of the Study:

• To review existing evidence on how various physical exercise modalities influence the Nrf2-mediated antioxidant metabolic response.
• To explore the molecular mechanisms linking exercise, hormesis, and adaptive changes to Nrf2 activation.
• To discuss the health implications and therapeutic potential of exercise-induced Nrf2 activation.

Main Methods:

• Systematic review of scientific literature.
• Analysis of studies investigating the effects of different exercise types on Nrf2 signaling.
• Examination of molecular pathways involved in exercise-induced oxidative stress and antioxidant defense.

Main Results:

• Physical exercise, particularly when involving preconditioning (hormesis), activates the Nrf2 pathway to enhance antioxidant defenses.
• Adaptive changes from training contribute to increased cellular resistance against environmental stressors and improved regenerative capacity.
• Evidence supports a role for exercise in modulating Nrf2 activity for health benefits.

Conclusions:

• Physical exercise serves as a potent stimulus for the Nrf2 antioxidant system, aiding in the management of oxidative stress.
• The findings underscore the potential of exercise as a therapeutic strategy for various diseases by leveraging Nrf2-mediated adaptations.
• Further research into exercise's clinical implications for athletes and disease treatment is warranted.