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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

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|April 1, 2011
PubMed
Abstract

Insights

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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