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Age-associated changes in nitric oxide metabolites nitrite and nitrate
1Department of Clinical Biochemistry, Ege University School of Medicine, Bornova, Izmir, Turkey.
International Journal of Clinical & Laboratory Research
|October 24, 2000
Summary
Aging reduces nitric oxide (NO) production, impacting vascular health. This study found decreased serum nitrate levels in older adults, suggesting impaired NO synthesis and potential endothelial dysfunction with age.
Area of Science:
- Cardiovascular Science
- Aging Research
- Endothelial Function
Background:
- Aging is a key factor in vascular disease development.
- Endothelial dysfunction, linked to aging, hypertension, and atherosclerosis, may involve reduced nitric oxide (NO).
- Experimental data suggest aging diminishes endothelium-derived NO, contributing to atherogenesis.
Purpose of the Study:
- To investigate the relationship between increasing age and serum levels of nitrite and nitrate, the end-products of nitric oxide, in healthy individuals.
- To assess age-related changes in nitric oxide bioavailability in a healthy cohort.
Main Methods:
- Sixty-nine healthy participants were stratified into five age groups (6-15, 16-30, 31-45, 46-60, and >61 years).
- Serum nitrite was quantified using the Griess reaction.
- Serum nitrate concentrations were determined via the nitrate reductase method.
Main Results:
- Serum nitrite levels showed no significant variation across the age groups.
- Serum nitrate concentrations demonstrated statistically significant differences among the age groups (P<0.001).
Conclusions:
- The findings indicate a reduction in nitric oxide synthesis and/or secretion associated with aging.
- This age-related decrease in nitric oxide may lead to impaired endothelium-dependent vasodilation.