Antioxidant enzymes and their implications in pathophysiologic processes

Area of Science:

• Biochemistry
• Cell Biology
• Physiology

Background:

• Aerobic respiration generates reactive oxygen species (ROS), which influence cell growth, differentiation, and signaling.
• While low ROS levels are beneficial, high concentrations can damage lipids, proteins, and DNA.
• Antioxidant defense systems, including enzymatic and non-enzymatic components, protect against ROS-induced damage.

Purpose of the Study:

• To describe the characteristics of key antioxidant enzymes.
• To explain the collaborative mechanisms of antioxidant enzymes against active oxygen.
• To highlight the implications of antioxidant system imbalances in aging and human diseases.

Main Methods:

• Review of existing literature on antioxidant systems.
• Description of the enzymatic and non-enzymatic antioxidant defenses.
• Analysis of the roles of superoxide dismutase (SOD), glutathione peroxidase (GPX), and catalase (CAT).

Main Results:

• Antioxidant enzymes SOD, GPX, and CAT work synergistically to neutralize ROS.
• Deviations from physiological antioxidant levels significantly impact cellular resistance to oxidative stress.
• The balance of ROS is crucial for cellular health and preventing oxidative damage.

Conclusions:

• Antioxidant defense systems are vital for aerobic organisms to counteract ROS.
• Dysregulation of antioxidant enzymes contributes to the aging process.
• Impaired antioxidant function is implicated in various human diseases, underscoring the importance of ROS balance.