Marked decrease in plasma antioxidants in aged osteoporotic women: results of a cross-sectional study.
Although recent epidemiological studies found a positive correlation between dietary vitamin C intake and bone mineral density, data on plasma levels of vitamin C or other antioxidants in osteoporotic subjects are scanty. The aim of this study was to evaluate whether antioxidant defenses are decreased in elderly osteoporotic women and, if this is the case, to understand whether osteoporosis is a condition characterized by increased oxidative stress. To answer these questions, plasma vitamins C, E, and A; uric acid; and the enzymatic activities of superoxide dismutase in plasma and erythrocytes and of glutathione peroxidase in plasma were measured in 75 subjects with osteoporosis and 75 controls. Dietary and endogenous antioxidants were consistently lower in osteoporotic than in control subjects. On the other hand, plasma levels of malondialdehyde, a byproduct of lipid peroxidation, did not differ between groups. Our results reveal that antioxidant defenses are markedly decreased in osteoporotic women. The mechanisms underlying antioxidant depletion and its relevance to the pathogenesis of osteoporosis deserve further investigation.
Maggio
Dario
D
Gerontology and Geriatrics, University of Perugia, 06122 Perugia, Italy. dario_maggio@msn.com
Barabani
Mauro
M
Pierandrei
Marco
M
Polidori
M Cristina
MC
Catani
Marco
M
Mecocci
Patrizia
P
Senin
Umberto
U
Pacifici
Roberto
R
Cherubini
Antonio
A
D000203:Activities of Daily Living; D000368:Aged; D000375:Aging; D000975:Antioxidants / Q000008:administration & dosage / Q000032:analysis*; D001205:Ascorbic Acid / Q000097:blood; D015992:Body Mass Index; D001842:Bone and Bones / Q000293:injuries; D003430:Cross-Sectional Studies; D004032:Diet; D004912:Erythrocytes / Q000201:enzymology; D005260:Female; D050723:Fractures, Bone / Q000453:epidemiology; D005979:Glutathione Peroxidase / Q000097:blood; D006801:Humans; D015227:Lipid Peroxidation; D008315:Malondialdehyde / Q000097:blood; D008875:Middle Aged; D010024:Osteoporosis / Q000097:blood* / Q000150:complications / Q000503:physiopathology; D013482:Superoxide Dismutase / Q000097:blood; D014527:Uric Acid / Q000097:blood; D014801:Vitamin A / Q000097:blood; D014810:Vitamin E / Q000097:blood
D000975:Antioxidants; D014801:Vitamin A; D014810:Vitamin E; D014527:Uric Acid; D008315:Malondialdehyde; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D001205:Ascorbic Acid