Inflammatory cytokines and related genes are induced in the rat hippocampus by limbic status epilepticus

De Simoni, M.G., Perego, C., Ravizza, T., Moneta, D., Conti, M., Marchesi, F. , De Luigi, A., Garattini, S. and Vezzani, A. (2000) Inflammatory cytokines and related genes are induced in the rat hippocampus by limbic status epilepticus. European Journal of Neuroscience, 12(7), pp. 2623-2633. (doi:10.1046/j.1460-9568.2000.00140.x)

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Abstract

Limbic status epilepticus was induced in rats by unilateral 60-min electrical stimulation of the CA3 region of the ventral hippocampus. As assessed by RT-PCR followed by Southern blot analysis, transcripts of interleukin-1β, interleukin-6, interleukin-1 receptor antagonist and inducible nitric oxide synthase were significantly increased 2 h after status epilepticus in the stimulated hippocampus. Induction was maximal at 6 h for interleukin-1β (445%), interleukin-6 (405%) and tumour necrosis factor-α (264%) and at 24 h for interleukin-1 receptor antagonist (494%) and inducible nitric oxide synthase (432%). In rats with spontaneous seizures (60 days after status epilepticus), interleukin-1β mRNA was still higher than controls (241%). Immunocytochemical staining of interleukin-1β, interleukin-6 and tumour necrosis factor-α was enhanced in glia with a time-course similar to that of the respective transcripts. Sixty days after status epilepticus, interleukin-1β immunoreactivity was increased exclusively in neurons in one third of the animals. Multiple intracerebroventricular injections of interleukin-1 receptor antagonist (0.5 μg/3 μL) significantly decreased the severity of behavioural convulsions during electrical stimulation and selectively reduced tumour necrosis factor-α content in the hippocampus measured 18 h after status epilepticus. Thus, the induction of spontaneously recurring seizures in rats involves the activation of inflammatory cytokines and related pro- and anti-inflammatory genes in the hippocampus. These changes may play an active role in hyperexcitability of the epileptic tissue.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Marchesi, Dr Francesco
Authors: De Simoni, M.G., Perego, C., Ravizza, T., Moneta, D., Conti, M., Marchesi, F., De Luigi, A., Garattini, S., and Vezzani, A.
College/School:College of Medical Veterinary and Life Sciences > School of Veterinary Medicine
Journal Name:European Journal of Neuroscience
Journal Abbr.:Europ. J. Neurosci.
ISSN:0953-816X
ISSN (Online):1460-9568

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