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    Area of Science:

    • Cardiovascular Biology
    • Aging Research
    • Biochemistry

    Background:

    • Aging is associated with altered hydrogen sulfide (H(2)S) metabolism.
    • Cardiovascular aging involves oxidative and nitrozative stress.
    • Endogenous H(2)S plays a role in cardiovascular health.

    Purpose of the Study:

    • To investigate the effect of pyridoxal-5-phosphate on H(2)S metabolism and oxidative stress in aging cardiovascular systems.
    • To determine if stimulating endogenous H(2)S synthesis can mitigate age-related cardiovascular damage.

    Main Methods:

    • Administration of pyridoxal-5-phosphate to aged rats.
    • Measurement of H(2)S levels and redox state in heart and aorta tissues.
    • Assessment of oxidative stress markers (superoxide generation, hydroxyl radicals, lipid oxidation products).
    • Evaluation of nitrozative stress markers (iNOS activity, nitrate reductase, NO synthase activity).

    Main Results:

    • Pyridoxal-5-phosphate administration restored endogenous H(2)S levels and improved the redox state.
    • Significant reduction in superoxide and hydroxyl radical generation in heart and aorta tissues.
    • Decreased levels of lipid oxidation products (diene conjugates, malonic dialdehyde).
    • Reduced iNOS activity and nitrate reductase, with recovery of constitutive NO synthase activity.

    Conclusions:

    • Stimulation of endogenous H(2)S synthesis via pyridoxal-5-phosphate effectively reduces oxidative and nitrozative stress in the aging cardiovascular system.
    • Pyridoxal-5-phosphate exhibits cardioprotective effects by modulating redox balance during aging.
    • These findings highlight the therapeutic potential of H(2)S modulation for age-related cardiovascular conditions.