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Updated: Feb 8, 2026
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Use of a Filter Cartridge for Filtration of Water Samples and Extraction of Environmental DNA
Published on: November 25, 2016
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MMP expression in leaking filtering blebs and tears after glaucoma filtering surgery.
Nurit Mathalone1, Sylvia Marmor, Michal A Rahat
1Department of Ophthalmology, Carmel Medical Center, Haifa, 34362, Israel. matnurit@yahoo.com
Summary
Matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) are involved in filtering bleb formation after glaucoma surgery. MMP-2 and ProMMP-2 tear levels may indicate bleb characteristics.
Area of Science:
- Ophthalmology
- Wound Healing Biology
Background:
- Glaucoma filtering surgery can be complicated by cystic blebs, particularly when anti-metabolites are used.
- Matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) play crucial roles in tissue remodeling and wound healing.
Purpose of the Study:
- To investigate the expression of MMP-2, MMP-9, TIMP-1, and TIMP-2 in filtering blebs.
- To determine if MMP and TIMP levels in tear fluid correlate with bleb morphology.
Main Methods:
- Immunohistochemistry was used to analyze MMP and TIMP expression in conjunctival tissue samples from blebs and controls.
- Zymography and Western blot analysis were performed on tear fluid samples to quantify MMP and TIMP levels.
Main Results:
- Filtering blebs showed increased expression of MMP-2 and MMP-9 in epithelial and stromal layers compared to controls.
- TIMP-1 and TIMP-2 were found in all layers of blebs but only in the epithelium of control conjunctiva.
- Tear fluid analysis revealed significantly higher MMP-2 and proMMP-2 activity in eyes with flat and cystic blebs compared to controls, with the highest levels in cystic blebs.
Conclusions:
- Elevated MMP and TIMP expression is associated with filtering bleb formation, indicating their role in bleb remodeling.
- MMP-2 and ProMMP-2 levels in tear fluid may serve as potential biomarkers for predicting bleb configuration after glaucoma surgery.
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