Abstract | PURPOSE: To investigate whether Decorin, a matrikine that regulates extracellular matrix (ECM) deposition, can reverse established trabecular meshwork (TM) fibrosis, lower IOP, and reduce progressive retinal ganglion cell (RGC) death in a novel rodent model of TM fibrosis. METHODS: Adult rats had intracameral (IC) injections of human recombinant (hr) TGF-β over 30 days (30 d; to induce TM fibrosis, raise IOP, and initiate RGC death by 17 d) or PBS (controls) and visually evoked potentials (VEP) were measured at 30 d to evaluate resultant visual pathway dysfunction. In some animals TGF-β injections were stopped at 17 d when TM fibrosis and IOP were consistently raised and either hrDecorin or PBS IC injections were administered between 21 d and 30 d. Intraocular pressure was measured biweekly and eyes were processed for immunohistochemical analysis of ECM deposition to assess TM fibrosis and levels of matrix metalloproteinases ( MMP) and tissue inhibitors of matrix metalloproteinases (TIMP) to assess fibrolysis. The effect of hrDecorin treatment on RGC survival was also assessed. RESULTS:
Transforming growth factor-β injections caused sustained increases in ECM deposition in the TM and raised IOP by 17 d, responses that were associated with 42% RGC loss and a significant decrease in VEP amplitude measured at 30 d. Decorin treatment from 17 d reduced TGF-β-induced TM fibrosis, increased levels of MMP2 and MMP9 and lowered TIMP2 levels, and lowered IOP, preventing progressive RGC loss. CONCLUSIONS: Human recombinant Decorin reversed established TM fibrosis and lowered IOP, thereby rescuing RGC from progressive death. These data provide evidence for the candidacy of hrDecorin as a treatment for open-angle glaucoma.
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Authors | Lisa J Hill, Ben Mead, Richard J Blanch, Zubair Ahmed, Felicity De Cogan, Peter J Morgan-Warren, Shabbir Mohamed, Wendy Leadbeater, Robert A H Scott, Martin Berry, Ann Logan |
Journal | Investigative ophthalmology & visual science
(Invest Ophthalmol Vis Sci)
Vol. 56
Issue 6
Pg. 3743-57
(Jun 2015)
ISSN: 1552-5783 [Electronic] United States |
PMID | 26066743
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
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Topics |
- Animals
- Cell Death
(drug effects)
- Decorin
(pharmacology, therapeutic use)
- Fibrosis
(drug therapy)
- Intraocular Pressure
(drug effects)
- Male
- Rats
- Rats, Sprague-Dawley
- Retinal Ganglion Cells
(drug effects, pathology)
- Trabecular Meshwork
(pathology)
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