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Fundamental and Clinical Pharmacology 2007-Dec

Systemic administration of adenosine ameliorates pentylenetetrazol-induced chemical kindling and secondary behavioural and biochemical changes in mice.

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Kiran Kumar Akula
Ashish Dhir
S K Kulkarni

Słowa kluczowe

Abstrakcyjny

Adenosine is one of the inhibitory neuromodulators in the brain and is considered to be responsible for seizure arrest and postictal refractoriness. Adenosine, adenosine receptor agonists, and adenosine uptake blockers are known to reduce the severity and duration of amygdala-kindled seizures. The present study was carried out to elucidate the anticonvulsant and neuromodulatory effect of systemic adenosine on the pentylenetetrazol (PTZ)-induced chemical kindling in mice. Kindling was induced by chronic administration of a subconvulsive dose of PTZ (40 mg/kg, i.p.) on every other day for a total period of 9 days. Adenosine was administered daily, 30 min before PTZ or vehicle. The kindling score was recorded immediately following PTZ administration according to a prevalidated scoring scale. Various behavioral and biochemical estimations were performed on day 10 (i.e. 24 h after the last dose of PTZ). Chronic PTZ treatment progressively increased the seizure score with the maximum score reached on day 9. Behavioral analysis found hyperlocomotor activity, anxiogenic response, hyperalgesia and amnesia in kindled mice. Biochemical analysis revealed that chronic treatment with PTZ significantly increased lipid peroxidation (malondialdehyde levels), nitrite (NO(2-) levels), adenosine deaminase (ADA) and total RNA levels and decreased catalase, reduced glutathione (GSH) levels in brain homogenates, and a depletion of adrenal ascorbic acid. Daily treatment with adenosine (25 and 50 mg/kg, i.p.) for 9 days led to a significant decrease in PTZ-induced kindling score and also reversed various behavioral and biochemical alterations produced by PTZ. The results of the present study suggested that systemic adenosine administration reversed the behavioral and biochemical alterations induced by chronic PTZ.

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