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Effects of the Matrix Metalloproteinase Inhibitor GM6001 on the Destruction and Alteration of Epithelial Basement Membrane During the Healing of Post-alkali Burn in Rabbit Cornea

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Abstract

Purpose

To examine the alteration in structure and matrix composition of epithelial basement membrane (BM) during the healing of alkali-burned rabbit cornea, and the roles of matrix metalloproteinases (MMPs) in these alterations.

Methods

The central cornea of one eye of 78 albino rabbits was exposed to 1 N NaOH for 180 s under general and topical anesthesia and allowed to heal with or without subconjunctival injection of GM6001 (an MMP inhibitor). Cryosections of affected corneas were observed by H&E staining, immunohistochemistry for type IV collagen subtypes, or in situ zymography for detection of localization of MMP activity.

Results

Uninjured corneal epithelial BM exhibited α5 (IV)-immunoreactivity, but lacked the α1/α2-immunoreactivity of collagen IV. Epithelial BM in healing burned cornea transiently exhibited α1/α2-immunoreactivity. Examination by in situ zymography showed an upregulation of MMP activity in the regenerated central epithelium and anterior stroma of the burned corneas at days 7 and 14. GM6001 suppressed degradation of α5-containing epithelial BM in vivo and also in organ culture.

Conclusions

Epithelial BM was degraded by endogenous MMPs during healing following an alkali burn in rabbit cornea. GM6001 had an inhibitory effect on the degradation of the epithelial basement membrane in burned cornea in vivo. Jpn J Ophthalmol 2006;50:90–95 © Japanese Ophthalmological Society 2006

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Correspondence to Tadashi Kato.

Additional information

The abstract of this paper was presented by Dr. Kato at the annual meeting of the Association for Research in Vision and Ophthalmology (Fort Lauderdale, FL, USA, in 1998 and 2003) as an oral and a poster presentation, respectively.

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Kato, T., Saika, S. & Ohnishi, Y. Effects of the Matrix Metalloproteinase Inhibitor GM6001 on the Destruction and Alteration of Epithelial Basement Membrane During the Healing of Post-alkali Burn in Rabbit Cornea. Jpn J Ophthalmol 50, 90–95 (2006). https://doi.org/10.1007/s10384-005-0287-8

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  • DOI: https://doi.org/10.1007/s10384-005-0287-8

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