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Effect of alpha‐lipoic acid supplementation on markers of protein oxidation in post‐mitotic tissues of ageing rat
Author(s) -
Kayali Refik,
Çakatay Ufuk,
Akçay Tülay,
Altuğ Tuncay
Publication year - 2005
Publication title -
cell biochemistry and function
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.933
H-Index - 61
eISSN - 1099-0844
pISSN - 0263-6484
DOI - 10.1002/cbf.1190
Subject(s) - alpha lipoic acid , oxidative stress , endocrinology , medicine , nitrotyrosine , lipoic acid , antioxidant , ageing , protein carbonylation , skeletal muscle , oxidative phosphorylation , chemistry , muscle tissue , brain tissue , biochemistry , biology , lipid peroxidation , nitric oxide , nitric oxide synthase
Abstract In the present study, we investigated whether DL ‐α‐lipoic acid (LA) supplementation could have prooxidant or antioxidant effects on oxidative protein damage parameters such as protein carbonyl (PCO), nitrotyrosine (NT), advanced oxidation protein products (AOPP), and protein thiol (P‐SH), as well as oxidative stress parameters such as total thiol (T‐SH), non‐protein thiol (Np‐SH), and lipid hydroperoxide (LHP) in the brain and the skeletal muscle tissue of aged rats. PCO, and NT levels were increased, AOPP and P‐SH levels were not changed in the brain tissue of aged rats given LA supplementation. On the other hand, TSH, Np‐SH, and LHP levels were decreased in the brain tissue of aged rats given LA supplementation. The levels of the same parameters were not significantly different in the skeletal muscle tissue of aged rats given LA supplementation. The increased levels of protein oxidation markers such as PCO, and NT in the brain tissue of LA‐supplemented aged rats compared with non‐supplemented aged rats may suggest that oxidative protein damage is increased in LA‐supplemented aged rats. We assume that an explanation for our findings regarding LA supplementation on protein oxidation markers in the brain tissue of aged rats may be due to the prooxidant effects of LA. Depending on post‐mitotic tissue type and dosage of LA, the prooxidant effects of LA supplementation, should be considered in future studies. Copyright © 2004 John Wiley & Sons, Ltd.