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Isoflurane prevents acquired epilepsy in rat models of temporal lobe epilepsy.

Abstract：

OBJECTIVE:Acquired epilepsy is a devastating long-term risk of various brain insults, including trauma, stroke, infections, and status epilepticus (SE). There is no preventive treatment for patients at risk. Attributable to the complex alterations involved in epileptogenesis, it is likely that multitargeted approaches are required for epilepsy prevention. We report novel preclinical findings with isoflurane, which exerts various nonanesthetic effects that may be relevant for antiepileptogenesis. METHODS:The effects of isoflurane were investigated in two rat models of SE-induced epilepsy: intrahippocampal kainate and systemic administration of paraoxon. Isoflurane was either administered during (kainate) or after (paraoxon) induction of SE. Magnetic resonance imaging was used to assess blood-brain barrier (BBB) dysfunction. Positron emission tomography was used to visualize neuroinflammation. Long-term electrocorticographic recordings were used to monitor spontaneous recurrent seizures. Neuronal damage was assessed histologically. RESULTS:In the absence of isoflurane, spontaneous recurrent seizures were common in the majority of rats in both models. When isoflurane was administered during kainate injection, duration and severity of SE were not affected, but only few rats developed spontaneous recurrent seizures. A similar antiepileptogenic effect was found when paraoxon-treated rats were exposed to isoflurane after SE. Moreover, in the latter model, isoflurane prevented BBB dysfunction and neurodegeneration, whereas isoflurane reduced neuroinflammation in the kainate model. INTERPRETATION:Given that isoflurane is a widely used volatile anesthetic, and is used for inhalational long-term sedation in critically ill patients at risk to develop epilepsy, our findings hold a promising potential to be successfully translated into the clinic. Ann Neurol 2016;80:896-908.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Bar-Klein G,Klee R,Brandt C,Bankstahl M,Bascuñana P,Töllner K,Dalipaj H,Bankstahl JP,Friedman A,Löscher W

doi

10.1002/ana.24804

subject

Has Abstract

pub_date

2016-12-01 00:00:00

pages

896-908

issue

eissn

0364-5134

issn

1531-8249

journal_volume

pub_type

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Isoflurane prevents acquired epilepsy in rat models of temporal lobe epilepsy.