The role of MMP-9 in integrin-mediated hippocampal cell death after pilocarpine-induced status epilepticus

GW Kim, HJ Kim, KJ Cho, HW Kim, YJ Cho… - Neurobiology of disease, 2009 - Elsevier
GW Kim, HJ Kim, KJ Cho, HW Kim, YJ Cho, BI Lee
Neurobiology of disease, 2009Elsevier
Recent studies demonstrate that matrix metalloproteinase-9 (MMP-9) is closely involved in
the pathogenesis of epilepsy. This study investigated the role of MMP-9 in hippocampal cell
death after pilocarpine-induced status epilepticus (SE). We showed that MMP-9 expression
and activity significantly increased and β1-integrin levels decreased on day 3 after SE. β1-
integrin degradation was also observed in hippocampal ex vivo extracts incubated with
recombinant active MMP-9. Treatment with a selective MMP-9 inhibitor attenuated MMP-9 …
Recent studies demonstrate that matrix metalloproteinase-9 (MMP-9) is closely involved in the pathogenesis of epilepsy. This study investigated the role of MMP-9 in hippocampal cell death after pilocarpine-induced status epilepticus (SE). We showed that MMP-9 expression and activity significantly increased and β1-integrin levels decreased on day 3 after SE. β1-integrin degradation was also observed in hippocampal ex vivo extracts incubated with recombinant active MMP-9. Treatment with a selective MMP-9 inhibitor attenuated MMP-9 up-regulation, β1-integrin degradation, the reduction of ILK activity and Akt phosphorylation, and subsequent hippocampal damage after SE. However, co-treatment with anti-β1-integrin antibody almost completely blocked the protective effects of the MMP-9 inhibitor on both integrin-mediated survival signaling and hippocampal cell death. Our study demonstrates that MMP-9 induces apoptotic hippocampal cell death by interrupting integrin-mediated survival signaling after SE and suggests that MMP-9 may be a promising target for a neuroprotective approach to preventing seizure-induced hippocampal damage.
Elsevier