Antioxidative enzyme activities in human erythrocytes

Area of Science:

• Biochemistry and Molecular Biology
• Human Physiology
• Nutritional Science

Background:

• Antioxidative enzymes are crucial for maintaining cellular health and preventing oxidative stress.
• Understanding the variability of these enzymes in the general population is essential for health assessments.
• Factors such as age, gender, and lifestyle significantly influence enzyme activity levels.

Purpose of the Study:

• To establish reliable and reproducible methods for analyzing key antioxidative enzymes in human erythrocytes.
• To determine reference intervals for these enzymes in a diverse adult population.
• To investigate the influence of age, gender, and lifestyle on enzyme activities.

Main Methods:

• Developed and validated standardized assay conditions for copper-zinc superoxide dismutase (CuZn-SOD), glutathione peroxidase (GSH-Px), catalase (CAT), and glutathione reductase (GR).
• Analyzed erythrocyte enzyme activities in a randomly selected population of 220 individuals (aged 20-89 years).
• Correlated enzyme activities with demographic data, lifestyle factors (tobacco use), and dietary supplement intake.

Main Results:

• Established reproducible methods for quantifying CuZn-SOD, GSH-Px, CAT, and GR activities in human red blood cells.
• Observed a significant age-related decline in CuZn-SOD and glutathione reductase activities.
• Found no significant age-related changes in GSH-Px and CAT activities; GSH-Px was higher with supplement use and lower with smoking, potentially explaining higher levels in women.

Conclusions:

• The study provides validated methodologies for assessing crucial antioxidative enzymes in erythrocytes.
• Age significantly impacts CuZn-SOD and GR levels, highlighting the need for age-specific reference ranges.
• Lifestyle factors, particularly diet and smoking, play a notable role in modulating GSH-Px activity.