MMP Expression in Leaking Filtering Blebs and Tears After Glaucoma Filtering Surgery

Overview

Journal Graefes Arch Clin Exp Ophthalmol

Specialty Ophthalmology

Date 2011 Apr 1

PMID 21452038

Citations 9

Authors

Nurit Mathalone

Sylvia Marmor

Michal A Rahat

Nitza Lahat

Yoram Oron

Orna Geyer

Affiliations

Soon will be listed here.

Abstract

Objective: Glaucoma filtering surgery may be compromised by cystic blebs which develop more frequently when anti-metabolites are used to arrest wound healing. Matrix metalloproteinases (MMPs) and the naturally occurring tissue inhibitors of metalloproteinases (TIMPs) are essential in connective tissue remodeling and wound healing. This study aimed to determine whether filtering blebs display increased expression of MMP-2, MMP-9, TIMP-1 and TIMP-2, and whether it is reflected in tear fluid.

Methods: Tissue samples from leaking blebs (n = 5) and control conjunctiva (n = 5) were evaluated by immunohistochemistry for MMP-2, MMP-9, TIMP-1 and TIMP-2. Tear fluid was collected from 12 patients (12 eyes) with cystic blebs and ten patients (ten eyes) with flat blebs following trabeculectomy with Mitomycin C applied and 16 controls. MMP levels were evaluated by zymography and TIMP levels by Western blot analysis.

Results: Conjunctival tissue was obtained from five eyes with cystic leaking blebs and five control eyes undergoing cataract surgery. More extensive MMP-2 and MMP-9 expression was found in the epithelial and stromal layers of blebs than in control conjunctiva. TIMP-1and TIMP-2 were expressed in all layers of the blebs, but only in the epithelium of control conjunctiva. MMP-2 and proMMP-2 activity in tears from eyes with flat blebs was significantly higher than that of controls, while activity in tears of eyes with cystic blebs was significantly higher than in those with flat blebs. There was no difference in MMP-9 activity between tears of control and post-filtering surgery eyes.

Conclusions: Increased MMPs and TIMPs expression is associated with the formation of filtering blebs, suggesting involvement of MMPs in bleb remodeling. MMP-2 and ProMMP-2 levels in tear fluid may be markers for bleb configuration.

Citing Articles

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Genetic susceptibility to high myopia in Han Chinese population.

Li Y, Zhang Y, Zhang P, Gao L, Ma Q, Li J Open Life Sci. 2022; 17(1):512-516.

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Association between MMP-2 gene polymorphism and cataract susceptibility: A protocol for systematic review and meta-analysis.

Jiang H, Gao Y, Chen Z, Xu H Medicine (Baltimore). 2021; 100(14):e25392.

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Comparison of the Efficacy and Safety of Trabeculectomy with Mitomycin C According to Concentration: A Prospective Randomized Clinical Trial.

Seol B, Lee S, Kim Y, Kim Y, Jeoung J, Park K J Clin Med. 2020; 10(1).

PMID: 33375313 PMC: 7796253. DOI: 10.3390/jcm10010059.

Exogenous Tissue Inhibitor of Metalloproteinase-2 Affects Matrix Metalloproteinase-2 Expression in Conjunctival Filtering Blebs and Bleb Scarring in Rats.

Wang L, Liu M, Yin G, Li N, Wang D Biomed Res Int. 2018; 2018:9365950.

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