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Related Experiment Videos

Matrix metalloproteinase 2: involvement in keratoconus.

V A Smith1, D L Easty

  • 1Department of Ophthalmology, Bristol Eye Hospital, University of Bristol, UK.

European Journal of Ophthalmology
|November 9, 2000
PubMed
Summary

Matrix metalloproteinase-2 (MMP-2) activation is key in diseases like keratoconus. Keratoconus corneal cells more readily activate MMP-2, suggesting its role in corneal basement membrane disruption.

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Area of Science:

  • Ophthalmology
  • Biochemistry
  • Cell Biology

Background:

  • Matrix metalloproteinase-2 (MMP-2) activation is implicated in progressive diseases involving basement membrane disruption.
  • Keratoconus, an ocular disease, involves corneal basement membrane abnormalities.

Purpose of the Study:

  • To investigate and compare the activities of MMP-2 secreted by keratocytes from normal and keratoconic corneas.
  • To understand the pathogenic role of MMP-2 in keratoconus.

Main Methods:

  • Zymography was used to analyze MMP-2 activity in keratocyte cultures from normal and keratoconic corneas.
  • Peptidase activity assays were performed on collagen substrates (Types I, III, IV, V) under various activation conditions.

Main Results:

  • Keratocytes from early-phase keratoconic corneas secreted an additional proMMP-2 conformer (Mr 61,000) compared to normal corneal keratocytes (Mr 65,000).
  • Activated MMP-2 (Mr 43,000) was more readily generated from keratoconic corneal keratocyte cultures than from normal ones.
  • The activated enzyme selectively hydrolyzed Type IV and denatured Type I collagen.

Conclusions:

  • The observed gelatinase activities represent conformers of corneal proMMP-2.
  • Easier activation of MMP-2 from keratoconic corneal keratocytes suggests its significant role in keratoconus pathogenesis.
  • Findings highlight MMP-2's potential as a therapeutic target in keratoconus.

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