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Catechin hydrate ameliorates redox imbalance and limits inflammatory response in focal cerebral ischemia.
Ashafaq, Mohammad; Raza, Syed Shadab; Khan, Mohd Moshahid; Ahmad, Ajmal; Javed, Hayate; Ahmad, Md Ejaz; Tabassum, Rizwana; Islam, Farah; Siddiqui, M Saeed; Safhi, Mohammed M; Islam, Fakhrul.
Afiliação
  • Ashafaq M; Neurotoxicology Laboratory, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), Hamdard Nagar, New Delhi 110062, India.
Neurochem Res ; 37(8): 1747-60, 2012 Aug.
Article em En | MEDLINE | ID: mdl-22570178
Epidemiologic studies have shown that foods rich in polyphenols, such as flavonoids, can lower the risk of ischemic disease; however, the mechanism of protection has not been clearly investigated. In this study, we hypothesized that pretreatment effect of catechin hydrate (CH) on functional outcome, neuronal damage and on secondary injuries in the ischemic brain of rats. To test this hypothesis, male Wistar rats were pretreated with CH (20 mg/kg b.wt) for 21 days and then subjected to 2 h middle cerebral artery occlusion (MCAO) followed by 22 h of reperfusion. After 2 h MCAO/22 h reperfusion, neurological deficit, infarct sizes, activities of antioxidant enzymes and cytokines level were measured. Immunohistochemistry and western blot were used to analyse the expression of glial fibrillary acidic protein (GFAP), inducible nitric oxide (iNOS) and NF-kB in ischemic brain. The administration of CH showed marked reduction in infarct size, reduced the neurological deficits, suppressed neuronal loss and downregulate the iNOS, GFAP and NF-kB expression in MCAO rats. A significantly depleted activity of antioxidant enzymes and content of glutathione in MCAO group were protected significantly in MCAO group pretreated with CH. Conversely, the elevated level of thiobarbituric acid reactive species and cytokines in MCAO group was attenuated significantly in CH pretreated group when compared with MCAO group. The results indicated that CH protected the brain from damage caused by MCAO, and this effect may be through downregulation of NF-kB expression.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Traumatismo por Reperfusão / Catequina / Isquemia Encefálica Limite: Animals Idioma: En Ano de publicação: 2012 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Traumatismo por Reperfusão / Catequina / Isquemia Encefálica Limite: Animals Idioma: En Ano de publicação: 2012 Tipo de documento: Article