title: Creatine reduces oxidative stress markers but does not protect against seizure susceptibility after severe traumatic brain injury.
abstract: Achievements made over the last years have highlighted the important role of creatine in health and disease. However, its effects on hyperexcitable circuit and oxidative damage induced by traumatic brain injury (TBI) are not well understood. In the present study we revealed that severe TBI elicited by fluid percussion brain injury induced oxidative damage characterized by protein carbonylation, thiobarbituric acid reactive species (TBARS) increase and Na(+),K(+)-ATPase activity inhibition 4 and 8 days after neuronal injury. Statistical analysis showed that after TBI creatine supplementation (300 mg/kg, p.o.) decreased the levels of protein carbonyl and TBARS but did not protect against TBI-induced Na(+),K(+)-ATPase activity inhibition. Electroencephalography (EEG) analysis revealed that the injection of a subconvulsant dose of PTZ (35 mg/kg, i.p.), 4 but not 8 days after neuronal injury, decreased latency for the first clonic seizures and increased the time of spent generalized tonic-clonic seizures compared with the sham group. In addition, creatine supplementation had no effect on convulsive parameters induced by a subconvulsant dose of PTZ. Current experiments provide evidence that lipid and protein oxidation represents a separate pathway in the early post-traumatic seizures susceptibility. Furthermore, the lack of consistent anticonvulsant effect exerted by creatine in this early phase suggests that its apparent antioxidant effect does not protect against excitatory input generation induced by TBI.
authors: Programa de Pós-Graduação em Ciências Biológicas: Bioquímica Toxicológica, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
authors: André Luis Lopes
authors: AL
authors: Saraiva
authors: Ana Paula Oliveira
authors: AP
authors: Ferreira
authors: Luiz Fernando Almeida
authors: LF
authors: Silva
authors: Maurício Scopel
authors: MS
authors: Hoffmann
authors: Fabrício Diniz
authors: FD
authors: Dutra
authors: Ana Flavia
authors: AF
authors: Furian
authors: Mauro Schneider
authors: MS
authors: Oliveira
authors: Michele Rechia
authors: MR
authors: Fighera
authors: Luiz Fernando Freire
authors: LF
authors: Royes
mesh_terms: D000818:Animals; D001930:Brain Injuries / Q000150:complications* / Q000178:diet therapy*; D003401:Creatine / Q000008:administration & dosage*; D019587:Dietary Supplements; D004195:Disease Models, Animal; D004569:Electroencephalography; D004827:Epilepsy / Q000139:chemically induced / Q000188:drug therapy; D004834:Epilepsy, Post-Traumatic / Q000209:etiology* / Q000517:prevention & control*; D008297:Male; D018384:Oxidative Stress / Q000187:drug effects*; D010433:Pentylenetetrazole / Q000009:adverse effects; D050050:Protein Carbonylation / Q000187:drug effects; D051381:Rats; D017208:Rats, Wistar; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
chemical_list: D017392:Thiobarbituric Acid Reactive Substances; D000254:Sodium-Potassium-Exchanging ATPase; D003401:Creatine; D010433:Pentylenetetrazole