Possible nitric oxide mechanism in the protective effect of hesperidin against pentylenetetrazole (PTZ)-induced kindling and associated cognitive dysfunction in mice. Epilepsy Behav
Pharmacology Division, University Institute of Pharmaceutical Sciences, UGC Centre of Advanced Study (UGC-CAS), Panjab University, Chandigarh 160014, India. Electronic address: . Epilepsy & Behavior
(Impact Factor: 2.26).
08/2013; 29(1):103-111. DOI: 10.1016/j.yebeh.2013.06.007
Epilepsy is a complex neurological disorder manifested by recurrent episodes of convulsive seizures, loss of consciousness, and sensory disturbances. Pentylenetetrazole (PTZ)-induced kindling primarily represents a model of generalized epilepsy. The present study has been undertaken to evaluate the neuroprotective potential of hesperidin and its interaction with nitric oxide modulators against PTZ-induced kindling and associated cognitive dysfunction in mice. The experimental protocol comprised of eleven groups (n=6), where a subconvulsive dose of PTZ (40mg/kg, i.p.) had been administered every other day for a period of 12days, and seizure episodes were noted after each PTZ injection over a period of 30min. The memory performance tests were carried out on days 13 and 14 followed by the estimation of biochemical and mitochondrial parameters. Chronic administration of a subconvulsive dose of PTZ resulted in an increase in convulsive activity culminating in generalized clonic-tonic seizures, as revealed by a progressive increase in seizure score as well as alteration in antioxidant enzyme levels (lipid peroxidation, nitrite, glutathione, super oxide dismutase, and catalase) and mitochondrial complex (I, II, and IV) activities, whereas chronic treatment with hesperidin (200mg/kg) significantly attenuated these behavioral, biochemical, and mitochondrial alterations. Further, treatment with l-arginine (100mg/kg) or l-NAME (10mg/kg) in combination with hesperidin significantly modulated the protective effect of hesperidin which was significant as compared to their effects per se in PTZ-treated animals. Thus, the present study suggests a possible involvement of the NO-cGMP pathway in the neuroprotective effect of hesperidin in PTZ-kindled mice.
Available from: Maria Elena Crespo-López
- "These results are in accordance with recent studies using the same dose of PTZ and showing a 44e98% increase in lipid peroxidation compared to control group (Chowdhury et al., 2013; Naziroglu et al., 2013). Seizures induced by PTZ exacerbate oxidative stress through the increased production of ROS and decreased activities of antioxidant enzymes, such as catalase or superoxide dismutase (Branco Cdos et al., 2013; Chowdhury et al., 2013; Kumar et al., 2013; Rodrigues et al., 2012). "
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ABSTRACT: Açai (Euterpe oleracea Mart.), a highly consumed fruit in Amazon,is from a common palm with remarkable antioxidant properties. Because oxidative stress and seizures are intimately linked, this study investigated the potential neuroprotective and anticonvulsant effects of commercial clarified açai juice (EO). EO did not alter spontaneous locomotor activity. Four doses of EO were sufficient to increase latencies to both first myoclonic jerk and first generalized tonic-clonic seizure and significantly decrease the total duration of tonic-clonic seizures caused by pentylenetetrazol administration. Also, electrocortical alterations provoked by pentylenetetrazol were prevented, significantly decreasing amplitude of discharges and frequencies above 50 Hz. EO was also able to completely prevent lipid peroxidation in the cerebral cortex, showing a potent direct scavenging property. These results demonstrate for the first time that E. oleracea significantly protects against seizures and seizure-related oxidative stress, indicating an additional protection for humans who consume this fruit.
Copyright © 2015. Published by Elsevier Ltd.
- "However, it is not known whether NCX plays a role in the process of kindling acquisition. PTZ-induced kindling is a progressive process and nitric oxide has been implicated in epilepsy and epileptogenesis (Han et al., 2000; Kumar et al., 2013). We previously found that nitric oxide increases NCX activity, NCX is involved in nitric oxide toxicity in neuronal and glial cells (Asano et al., 1995; Takuma et al., 2013), and nitric oxide-NCX signal is involved in 1-methyl-4-phenyl-1,2,3,6- tetrahydropyridine-induced dopaminergic neurotoxicity in mice (Ago et al., 2011). "
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ABSTRACT: Previous studies have shown that inhibitors of the Na(+)/Ca(2+) exchanger (NCX) attenuate seizure activity in drug-induced epilepsy models, but the role of NCX in epilepsy is not fully understood. The present study examined the effects of pentylenetetrazole (PTZ)-induced kindling on the mRNA expression of NCX isoforms (NCX1, NCX2 and NCX3) in mouse brain. Chronic administration of PTZ at 40mg/kg resulted in kindling seizure development. It caused decreases in the mRNA levels of NCX1 and NCX2, but not NCX3, in the hippocampus. Changes in NCX isoform expression levels were not observed in the prefrontal cortex or striatum. Acute PTZ at 40mg/kg, which caused little seizure activity, also decreased NCX2, but not NCX1 mRNA levels in the hippocampus. These results suggest that down-regulation of hippocampal NCX1 expression is associated with PTZ-induced kindling seizure development.
Copyright © 2015 Elsevier B.V. All rights reserved.
Available from: Coral Rosa-Falero
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ABSTRACT: Epilepsy is a serious neurological condition and pharmacotherapy is not effective for all patients and causes serious adverse effects and pharmacokinetic and pharmacodynamic interactions. Natural products and ethnobotanical resources can help develop new therapeutic options for conditions like epilepsy. In Puerto Rico, ethnobotanical resources highlight the anxiolytic properties of a tea like preparation made from the leaves of the Citrus aurantium tree or bitter orange. Studies performed with essential oils from the peel of the fruit have shown to increase seizure latency to pentylenetetrazole (PTZ) and maximal electroshock seizure in mice. We characterized the extract composition, and used a model of PTZ induces seizures in the zebrafish and a receptor-ligand binding assay to determine if this preparation has anticonvulsant properties and its mechanism of action. We determined that the aqueous extract made from the leaves of the C. aurantium tree contains hesperidin, neohesperidin, and neohesperidin dihydrochalcone. Using our zebrafish model, we determined that exposure to the C. aurantium 28 mg/mL extract in aquarium water increases seizure latency by 119% compared to controls. We ruled out a mechanism involving GABAA receptors using the selective antagonist gabazine. We used two approaches to study the role of glutamate in the mechanism of the C. aurantium extract. The ligand binding assay revealed C. aurantium extracts at concentrations of 0.42 to 5.6 mg/mL significantly reduced [(3)H]Glu binding indicating an interaction with glutamate receptors, in particular with NMDA receptors and mGluR II. This interaction was confirmed with our animal model using selective receptor antagonists and we identified an interaction with mGluR I, not observed in the ligand binding experiment. These study provide evidence of the anticonvulsant properties of the aqueous extract made from the leaves of the C. aurantium tree and a mechanism involving NMDA and mGluR's I and II.
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