[Age related changes of physical-chemical parameters of erythrocytes]

Area of Science:

• Physiology
• Biochemistry
• Gerontology

Background:

• Erythrocyte homeostasis is crucial for oxygen transport.
• Newborns exhibit unique physiological challenges in maintaining erythrocyte function.
• Reactive oxygen species (ROS) play a significant role in age-related erythrocyte changes.

Purpose of the Study:

• To investigate age-related alterations in erythrocyte physical-chemical parameters.
• To elucidate the role of antioxidant defense systems in erythrocyte aging.
• To understand the mechanisms underlying erythrocyte homeostasis in newborns and aged individuals.

Main Methods:

• Analysis of erythrocyte physical-chemical parameters.
• Assessment of antioxidant defense system activity.
• Evaluation of ion channel function and calcium homeostasis.
• Measurement of nitric oxide (NO) and methaemoglobin levels.

Main Results:

• Newborns show erythrocyte antioxidant defense insufficiency, leading to increased reactive oxygen species.
• Excessive reactive oxygen species in newborns disrupt cation channels, increase intracellular calcium, and activate Ca(2+)-dependent nitric oxide synthase (NOS).
• Despite high NO, newborns exhibit increased methaemoglobin and erythrocyte hemolysis due to impaired antioxidant systems and Ca(2+)-dependent mechanisms.
• Aged individuals demonstrate increased antioxidant enzyme activity, a compensatory mechanism against oxidative stress, maintaining physiological hemolysis levels.

Conclusions:

• Erythrocyte antioxidant defense insufficiency is a key factor in newborn homeostasis peculiarities.
• Age-related changes in erythrocyte parameters are influenced by oxidative stress and compensatory antioxidant mechanisms.
• Understanding these age-related erythrocyte dynamics is vital for addressing associated health conditions.