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(Investigative Ophthalmology and Visual Science. 1999;40:2430-2434.)
© 1999 by The Association for Research in Vision and Ophthalmology, Inc.

Effect of Metalloproteinase Inhibitor on Corneal Cytokine Expression after Alkali Injury

Chie Sotozono, Jiucheng He, Mamoru Tei, Yoich Honma and Shigeru Kinoshita

From the Department of Ophthalmology, Kyoto Prefectural University of Medicine, Kyoto, Japan.

Abstract

PURPOSE. Interleukin (IL)-1{alpha} and IL-6 levels in the cornea are greatly elevated during the early stages after an alkali burn in mice. The authors investigated the effect of synthetic inhibitor of matrix metalloproteinase (SIMP) on the expression of inflammatory cytokines in alkali-burned murine corneas and evaluated the clinical appearance of the eyes.

METHODS. After 0.5N NaOH-alkali burns to 400 corneas of ICR mice, 200 received 400 µg/ml of SIMP topically 4 times a day while 200 corneas were similarly treated with vehicle only. At days 4, 7 and 14 after injury, each cornea was assigned a clinical score for corneal opacity, corneal epithelial defect, hyphema and cataract. Extracts of injured corneas in each group were then assayed for cytokine production using ELISA systems for IL-1{alpha}, IL-1ß, IL-6 and tumor necrosis factor-{alpha} (TNF-{alpha}).

RESULTS. The levels of IL-1{alpha}, IL-1ß and IL-6 were significantly lower in the SIMP-treated group than in the vehicle-treated group 7 days after the burn. However, levels of these cytokines were similar in the SIMP and non-SIMP groups at days 4 and 14. Levels of TNF-{alpha} did not differ between both groups at any postinjury time. In the SIMP-treated corneas, there was less opacification and hyphema formation and epithelial regeneration was faster.

CONCLUSIONS. Topical application of SIMP in alkali-burned murine corneas reduced the expression of IL-1{alpha}, IL-1ß, and IL-6 and lessened the severity of the injury.




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