Changes in matrix metalloproteinase network in a spontaneous autoimmune uveitis model.

Abstract:

PURPOSE:Autoimmune uveitis is a sight-threatening disease in which autoreactive T cells cross the blood-retinal barrier. Molecular mechanisms contributing to the loss of eye immune privilege in this autoimmune disease are not well understood. In this study, the authors investigated the changes in the matrix metalloproteinase network in spontaneous uveitis. METHODS:Matrix metalloproteinase (MMP) MMP2, MMP9, and MMP14 expression and tissue inhibitor of metalloproteinase (TIMP)-2 and lipocalin 2 (LCN2) expression were analyzed using Western blot quantification. Enzyme activities were examined with zymography. Expression patterns of network candidates were revealed with immunohistochemistry, comparing physiological appearance and changes in a spontaneous recurrent uveitis model. RESULTS:TIMP2 protein expression was found to be decreased in both the vitreous and the retina of a spontaneous model for autoimmune uveitis (equine recurrent uveitis [ERU]), and TIMP2 activity was significantly reduced in ERU vitreous. Functionally associated MMPs such as MMP2, MMP14, and MMP9 were found to show altered or shifted expression and activity. Although MMP2 decreased in ERU vitreous, MMP9 expression and activity were found to be increased. These changes were reflected by profound changes within uveitic target tissue, where TIMP2, MMP9, and MMP14 decreased in expression, whereas MMP2 displayed a shifted expression pattern. LCN2, a potential stabilizer of MMP9, was found prominently expressed in equine healthy retina and displayed notable changes in expression patterns accompanied by significant upregulation in autoimmune conditions. Invading cells expressed MMP9 and LCN2. CONCLUSIONS:This study implicates a dysregulation or a change in functional protein-protein interactions in this TIMP2-associated protein network, together with altered expression of functionally related MMPs.

authors

Hofmaier F,Hauck SM,Amann B,Degroote RL,Deeg CA

doi

10.1167/iovs.10-6475

subject

Has Abstract

pub_date

2011-04-08 00:00:00

pages

2314-20

issue

5

eissn

0146-0404

issn

1552-5783

pii

iovs.10-6475

journal_volume

52

pub_type

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