Journal
NEUROBIOLOGY OF DISEASE
Volume 8, Issue 4, Pages 568-580Publisher
ACADEMIC PRESS INC
DOI: 10.1006/nbdi.2001.0415
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- NINDS NIH HHS [R01 NS39016] Funding Source: Medline
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The mechanism by which seizures induce neuronal death is not completely understood. Caspase-8 is a key initiator of apoptosis via extrinsic, death receptor-mediated pathways; we therefore investigated its role in mediating seizure-induced neuronal death evoked by unilateral kainic acid injection into the amygdala of the rat, terminated after 40 min by diazepam. We demonstrate that cleaved (P18) caspase-8 was detectable immediately following seizure termination coincident with an increase in cleavage of the substrate lie-Glu-Thr-Asp (IETD)-p-nitroanilide and the appearance of cleaved (p15) Bid. Expression of Fas and FADD, components of death receptor signaling, was increased following seizures. In vivo intracerebroventricular z-IETD-fluoromethyl ketone administration significantly reduced seizure-induced activities of caspases 8, 9, and 3 as well as reducing Bid and caspase-9 cleavage, cytochrome c release, DNA fragmentation, and neuronal death. These data suggest that intervention in caspase-8 and/or death receptor signaling may confer protection on the brain from the injurious effects of seizures. (C) 2001 Academic Press.
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