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Matrix metalloproteinase-9 contributes to brain extravasation and edema in fulminant hepatic failure mice.

Abstract：

BACKGROUND/AIMS:Fulminant hepatic failure (FHF) can be dreadful. When coma sets in, brain edema develops taking FHF into a lethal course. Mechanisms of brain extravasation leading to brain edema remain incompletely understood. Matrix metalloproteinase (MMP)-9 is implicated in various brain injuries. We hypothesized that MMP-9 contributes to brain edema in FHF. METHODS:MMP-9 and its proform were assayed using SDS-PAGE and in situ gelatin zymographies. Brain extravasation was assessed with Evans blue. Brain water was determined by specific gravity and astrocytic endfoot swelling by electron microscopy. FHF in mice was induced by azoxymethane. MMP inhibitor GM6001 and MMP-9 monoclonal antibody were used. RESULTS:Active MMP-9 was significantly increased at the onset of coma and brain extravasation in FHF mice. Blocking MMP-9 with either GM6001 or MMP-9 monoclonal antibody significantly attenuated brain extravasation, astrocytic endfoot swelling, and brain edema. Brains of FHF mice did not show MMP-9 activity. In contrast, livers of these animals showed marked up-regulation of MMP-9 activity. CONCLUSIONS:Our findings suggest that MMP-9 contributes to the pathogenesis of brain extravasation and edema in FHF. The necrotic liver is the source of MMP-9 in FHF. Inhibition of MMP-9 may protect against the development of brain edema in FHF.

journal_name

J Hepatol

journal_title

Journal of hepatology

authors

Nguyen JH,Yamamoto S,Steers J,Sevlever D,Lin W,Shimojima N,Castanedes-Casey M,Genco P,Golde T,Richelson E,Dickson D,McKinney M,Eckman CB

doi

10.1016/j.jhep.2005.09.019

subject

Has Abstract

pub_date

2006-06-01 00:00:00

pages

1105-14

issue

6

eissn

0168-8278

issn

1600-0641

pii

S0168-8278(05)00678-1

journal_volume

44

pub_type

杂志文章

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