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Increased expression of matrix metalloproteinase 9 in cortical lesions from patients with focal cortical dysplasia type IIb and tuberous sclerosis complex.

Abstract：

:The malformative cortical lesions in the cerebral cortex that are characteristic of focal cortical dysplasia type IIb (FCDIIb) and tuberous sclerosis complex (TSC) are well-recognized causes of chronic intractable epilepsy in children. Increasing evidence suggests that extracellular matrix molecules play important roles in epileptogenesis. Matrix metalloproteinase 9 (MMP9), a typical extracellular matrix proteolytic protease, has been shown to participate in the occurrence of seizures in experimental models. In the present study, we used immunoblotting to analyze the levels of MMP9 protein in FCDIIb lesions, TSC tubers and control samples, which included epileptic neocortices from temporal lobe epilepsy and non-epileptic normal cortices (CTX). The cellular distribution of MMP9 was further investigated by immunohistochemical methods. Our findings demonstrated the elevated levels of the inactive and active forms of MMP9 protein in FCDIIb and TSC lesions compared with CTX. Furthermore, the immunohistochemical results showed that MMP9 was characteristically expressed in the following misshapen cells: hypertrophic neurons, dysmorphic neurons, balloon cells and giant cells. Additionally, double immunofluorescent staining revealed that the reactive astrocytes, but not the microglia, expressed high levels of MMP9. Taken together, our findings suggest that the overexpression and spatial distribution patterns of MMP9 may be linked with the intractable epilepsy caused by FCDIIb and TSC.

journal_name

Brain Res

journal_title

Brain research

authors

Li S,Yu S,Zhang C,Shu H,Liu S,An N,Yang M,Yin Q,Yang H

doi

10.1016/j.brainres.2012.03.009

subject

Has Abstract

pub_date

2012-05-09 00:00:00

pages

46-55

eissn

0006-8993

issn

1872-6240

pii

S0006-8993(12)00445-3

journal_volume

1453

pub_type

杂志文章

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