title: Time course of oxidative stress, lesion and edema after intrastriatal injection of malonate in rat: effect of alpha-phenyl-N-tert-butylnitrone.
abstract: The aim of this study was to characterize the model of oxidative stress consisting in the infection of malonate (3 mumol), an inhibitor of mitochondrial complex II, in the rat striatum. The striatal concentrations of both the reduced and oxidized forms of glutathione (the major endogenous antioxidant) were determined at various times after malonate injection (1-4 h) in order to evaluate the evolution of oxidative stress. The progression of lesion size and edema was also determined up to 24 h after malonate administration. Finally, the effect of alpha-phenyl-N-tert-butylnitrone (PBN), an antioxidant nitrone, was studied. The levels of reduced glutathione (GSH) progressively decreased after malonate injection up to 40% of those of sham animals at 4 h. An increase in the concentrations of oxidized glutathione (GSSG) was also observed as early as 1 h after malonate administration which was maintained up to 4 h. The size of the lesion was maximal within 2 h of malonate injection, whereas edema continued to increase between 2 and 24 h. Injection of PBN at 100 mg/kg i.p. 30 min before and 2 h after malonate administration abolished the GSSG increase caused by malonate but did not modify the drop in GSH. This moderate antioxidant effect of PBN was associated with a slight decrease of the lesion area at two levels (10.7 and 10.2 mm anterior to the interaural line), but the lesion volume remained unchanged. By contrast, PBN reduced edema by 30%. Taken together, these results show that malonate induced a severe oxidative stress leading to the rapid development of the lesion. PBN demonstrates anti-edematous properties that are not sufficient to reduce the lesion.
authors.affiliation: Laboratoire de Pharmacologie, UPRES EA2510, Université René Descartes, 4 avenue de l'Observatoire, 75006 Paris, France.
authors.forename: Alexia
authors.initials: A
authors.lastname: Paucard
authors.forename: Valérie C
authors.initials: VC
authors.lastname: Besson
authors.forename: Michel
authors.initials: M
authors.lastname: Plotkine
authors.forename: Isabelle
authors.initials: I
authors.lastname: Margaill
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D001929:Brain Edema / Q000139:chemically induced / Q000378:metabolism / Q000517:prevention & control*; D003342:Corpus Striatum / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D003497:Cyclic N-Oxides; D005978:Glutathione / Q000378:metabolism; D019803:Glutathione Disulfide / Q000378:metabolism; D008297:Male; D008314:Malonates; D009589:Nitrogen Oxides / Q000494:pharmacology*; D018384:Oxidative Stress / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D000975:Antioxidants; D003497:Cyclic N-Oxides; D008314:Malonates; D009589:Nitrogen Oxides; C029217:phenyl-N-tert-butylnitrone; C030290:malonic acid; D005978:Glutathione; D019803:Glutathione Disulfide