Unknown

Dataset Information

0

Important role of matrix metalloproteinase 9 in epileptogenesis.


ABSTRACT: Temporal lobe epilepsy (TLE) is a devastating disease in which aberrant synaptic plasticity plays a major role. We identify matrix metalloproteinase (MMP) 9 as a novel synaptic enzyme and a key pathogenic factor in two animal models of TLE: kainate-evoked epilepsy and pentylenetetrazole (PTZ) kindling-induced epilepsy. Notably, we show that the sensitivity to PTZ epileptogenesis is decreased in MMP-9 knockout mice but is increased in a novel line of transgenic rats overexpressing MMP-9. Immunoelectron microscopy reveals that MMP-9 associates with hippocampal dendritic spines bearing asymmetrical (excitatory) synapses, where both the MMP-9 protein levels and enzymatic activity become strongly increased upon seizures. Further, we find that MMP-9 deficiency diminishes seizure-evoked pruning of dendritic spines and decreases aberrant synaptogenesis after mossy fiber sprouting. The latter observation provides a possible mechanistic basis for the effect of MMP-9 on epileptogenesis. Our work suggests that a synaptic pool of MMP-9 is critical for the sequence of events that underlie the development of seizures in animal models of TLE.

SUBMITTER: Wilczynski GM 

PROVIDER: S-EPMC2265409 | biostudies-literature | 2008 Mar

REPOSITORIES: biostudies-literature

altmetric image

Publications


Temporal lobe epilepsy (TLE) is a devastating disease in which aberrant synaptic plasticity plays a major role. We identify matrix metalloproteinase (MMP) 9 as a novel synaptic enzyme and a key pathogenic factor in two animal models of TLE: kainate-evoked epilepsy and pentylenetetrazole (PTZ) kindling-induced epilepsy. Notably, we show that the sensitivity to PTZ epileptogenesis is decreased in MMP-9 knockout mice but is increased in a novel line of transgenic rats overexpressing MMP-9. Immunoel  ...[more]

Similar Datasets

| S-EPMC4978505 | biostudies-literature
| S-EPMC6691000 | biostudies-literature
| S-EPMC3556866 | biostudies-literature
| S-EPMC2999525 | biostudies-literature
| S-EPMC2853782 | biostudies-literature
| S-EPMC5356841 | biostudies-literature
| S-EPMC5000720 | biostudies-literature
| S-EPMC3261337 | biostudies-literature
| S-EPMC4302670 | biostudies-literature
| S-EPMC6687911 | biostudies-literature