3-Hydroxyglutaric acid induces oxidative stress and decreases the antioxidant defenses in cerebral cortex of young rats.
Glutaryl-CoA dehydrogenase deficiency (GDD) is an inherited neurometabolic disorder biochemically characterized by tissue accumulation of glutaric, 3-hydroxyglutaric (3-OHGA) and glutaconic acids and clinically by severe neurological symptoms and cerebral atrophy whose pathophysiology is poorly known. In the present study we investigated the effect of 3-OHGA, considered the main neurotoxin in GDD, on the lipoperoxidation parameters chemiluminescence and thiobarbituric acid-reactive species (TBA-RS), and on the amount of nitric oxide metabolites in cerebral cortex of young rats. Total radical-trapping antioxidant potential (TRAP), which reflects the tissue antioxidant defenses, was also examined. We observed that 3-OHGA significantly increased chemiluminescence, TBA-RS and nitric oxide metabolites, in contrast to TRAP, which was decreased by the metabolite. The data indicate a stimulation of lipid peroxidation and free radical production, and a reduction of the tissue antioxidant defenses caused by the metabolite. In case these findings also occur in the human condition, it may be presumed that oxidative stress is involved in the brain damage observed in GDD.
Latini
Alexandra
A
Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal de Río Grande do Sul, Porto Alegre, RS, Brazil.
Borba Rosa
Rafael
R
Scussiato
Karina
K
Llesuy
Susana
S
Belló-Klein
Adriane
A
Wajner
Moacir
M
D000818:Animals; D000975:Antioxidants / Q000378:metabolism; D002540:Cerebral Cortex / Q000187:drug effects* / Q000378:metabolism*; D005977:Glutarates / Q000633:toxicity*; D008163:Luminescent Measurements; D008297:Male; D009569:Nitric Oxide / Q000378:metabolism; D018384:Oxidative Stress; D051381:Rats; D017208:Rats, Wistar; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
C108959:3-hydroxyglutaric acid; D000975:Antioxidants; D005977:Glutarates; D017392:Thiobarbituric Acid Reactive Substances; D009569:Nitric Oxide