Naringin ameliorates pentylenetetrazol-induced seizures and associated oxidative stress, inflammation, and cognitive impairment in rats: Possible mechanisms of neuroprotection

Oxidative stress and cognitive impairment are associated with PTZ-induced convulsions. Naringin is a bioflavonoid present in the grapefruit. It is a potent antioxidant, and we evaluated its effect on PTZ-induced convulsions. Rats were pretreatedwith normal saline, naringin (20, 40, and 80 mg/kg, i.p.), or diazepam(5 mg/kg, i.p.) 30 min prior to the administration of PTZ. The administration of PTZ induced myoclonic jerks and generalized tonicclonic seizures (GTSs). We observed that naringin significantly prolonged the induction of myoclonic jerks dose- dependently. Naringin (80 mg/kg, i.p.) pretreatment protected all rats, and this protective effect was annulled by the GABAA receptor antagonist, flumazenil. In addition, naringin reduced brain MDA and TNF- a levels and conserved GSH. The pretreatment also enhanced the performance of rats in the passive avoidance task. Our observations highlight the antioxidant, antiinflammatory, and anticonvulsant potential of naringin. Also, naringin modulates the GABAA receptor to produce anticonvulsant effects and to ameliorate cognitive impairment. (C) 2014 Elsevier Inc. All rights reserved.