Differential effects of ADAMTS-1, -4, and -5 in the trabecular meshwork

Kate Keller, John M. Bradley, Ted Acott

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Purpose. Matrix metalloproteinases (MMPs) degrade extracellular matrix (ECM) and increase outflow facility in anterior segment perfusion culture. One group is the ADAMTSs (a disintegrin and metalloproteinase with thrombospondin type 1 motifs). In this study, the authors examined the effects of ADAMTS-1, -4, and -5 on outflow facility and investigated their mRNA levels and protein expression in the trabecular mesh-work (TM). Methods. ADAMTS mRNA was quantitated by qRT-PCR in TM cells exposed to TNFa, IL-1α, TGFβ2, or mechanical stretch. ADAMTS-4 mRNA was assessed in normal and glaucomatous human anterior segments perfused at physiological or elevated pressure. Immunofluorescence was used to localize ADAMTSs in human TM cells and tissue. Anterior segments in perfusion culture were treated with recombinant ADAMTSs to determine effects on outflow facility. Results. Cytokine treatment increased mRNA of all three ADAMTSs. Mechanical stretch increased ADAMTS-4 mRNA but conversely decreased ADAMTS-1 and -5 mRNA. ADAMTS-4 mRNA levels increased in response to pressure elevation in normal eyes and to higher levels in glaucomatous eyes. ADAMTS-4 protein was highly increased in the juxtacanalicular region of the TM in anterior segments perfused at increased pressure. In human TM cells, ADAMTS-4 colocalized with cor-tactin in podosome- or invadopodia-like structures, but ADAMTS-1 and -5 did not. Recombinant ADAMTS-4 increased outflow facility in human and porcine anterior segments, whereas recombinant ADAMTSs-1 and -5 did not. Conclusions. These results show differential responses and expression of ADAMTS-1, -4, and -5 in human TM cells. Combined, these results suggest that ADAMTS-4 is a potential modifier of outflow facility.

Original languageEnglish (US)
Pages (from-to)5769-5777
Number of pages9
JournalInvestigative Ophthalmology and Visual Science
Volume50
Issue number12
DOIs
StatePublished - Dec 2009

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Trabecular Meshwork
Messenger RNA
Pressure
Perfusion
Thrombospondin 1
Disintegrins
Metalloproteases
Matrix Metalloproteinases
Interleukin-1
Fluorescent Antibody Technique
Extracellular Matrix
Swine
Cytokines
Polymerase Chain Reaction

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience
  • Medicine(all)

Cite this

Differential effects of ADAMTS-1, -4, and -5 in the trabecular meshwork. / Keller, Kate; Bradley, John M.; Acott, Ted.

In: Investigative Ophthalmology and Visual Science, Vol. 50, No. 12, 12.2009, p. 5769-5777.

Research output: Contribution to journalArticle

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