Changes in antioxidant enzyme levels and DNA damage during aging.

Area of Science:

• Biochemistry
• Gerontology
• Molecular Biology

Background:

• The human aging process involves multiple complex mechanisms.
• The role of free radicals and antioxidants in aging is a significant area of research.

Purpose of the Study:

• To evaluate free radical generation, DNA damage, and antioxidant enzyme levels in healthy individuals across different age groups.
• To investigate the relationship between aging, lifestyle factors (smoking, body mass), and oxidative stress markers.

Main Methods:

• Measured lymphocyte free radical generation (O(2)(-) & H(2)O(2)), DNA damage, and antioxidant enzyme levels (glutathione transferase, superoxide dismutase, catalase).
• Studied 110 healthy individuals aged 20-80 years.
• Analyzed correlations between age, smoking status, body mass, and measured biomarkers.

Main Results:

• Antioxidant enzyme levels were significantly lower in older individuals compared to younger ones.
• Free radical concentration and DNA damage levels were significantly higher in older individuals.
• Cigarette smoking correlated positively with free radicals and DNA damage, and inversely with antioxidants.
• Body mass showed a positive correlation only with free radical generation.

Conclusions:

• Aging is associated with reduced antioxidant capacity and increased oxidative stress and DNA damage.
• Depletion of antioxidant enzymes makes older adults more susceptible to free radical damage.
• Lifestyle factors like smoking exacerbate oxidative stress during aging.