Effect of cyclical mechanical stretch and exogenous transforming growth factor-β1 on matrix metalloproteinase-2 activity in lamina cribrosa cells from the human optic nerve head

Ruaidhrí P. Kirwan, John K. Crean, Cecilia H. Fenerty, Abbot F. Clark, Colm J. O'Brien

Research output: Contribution to journalArticle

63 Scopus citations

Abstract

Purpose: Extensive remodeling of the lamina cribrosa extracellular matrix occurs in primary open angle glaucoma. The transforming growth factor-β (TGF-β) and matrix metalloproteinase (MMP) protein families are implicated in this process. The authors investigated (a) the effect of cyclical mechanical stretch on TGF-β1 mRNA synthesis, TGF-β1 protein secretion, MMP-2 protein activity and (b) the effect of exogenous TGF-β1 on MMP-2 protein activity in human lamina cribrosa cells in vitro. Methods: Primary human lamina cribrosa cells grown on flexible and rigid plates were exposed to cyclical stretch (1Hz, 15%) or static conditions for 12 and 24 hours. Cells grown on 100-mm plates were exposed to human TGF-β1 (10 ng/ml) or vehicle (4 mM HCl/1% BSA) for 24 hours. TGF-β1 mRNA synthesis in stretched and static cells was measured using real-time polymerase chain reaction. TGF-β1 protein secretion in stretched and static cell media was measured using enzyme linked immunosorbent assay. Gelatin zymography measured MMP-2 activity in stretched, static, TGF-β1- treated and vehicle-treated cell media. Results: Cyclical stretch induced significant increases in TGF-β1 mRNA synthesis after 12 hours (**P < 0.01) and TGF-β1 protein secretion after 24 hours (*P < 0.05). Cyclical stretch significantly (*P < 0.05) increased MMP-2 activity in cell media after 24 hours. Exogenous TGF-β1 induced a significant (**P < 0.01) increase in cell media MMP-2 activity after 24 hours. Conclusions: These results suggest that cyclical stretch and TGF-β1 modulate MMP-2 activity in human lamina cribrosa cells. TGF-β1 and MMP-2 release from lamina cribrosa cells may facilitate matrix remodeling of the optic nerve head in primary open angle glaucoma.

Original languageEnglish
Pages (from-to)327-334
Number of pages8
JournalJournal of Glaucoma
Volume13
Issue number4
DOIs
StatePublished - 1 Aug 2004

Keywords

  • Extracellular matrix
  • Lamina cribrosa
  • MMP-2
  • Mechanical stretch
  • TGF-β1

Fingerprint Dive into the research topics of 'Effect of cyclical mechanical stretch and exogenous transforming growth factor-β1 on matrix metalloproteinase-2 activity in lamina cribrosa cells from the human optic nerve head'. Together they form a unique fingerprint.

  • Cite this