NDLI: Modulation of matrix metalloproteinases by ultraviolet radiation in the canine cornea.

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Modulation of matrix metalloproteinases by ultraviolet radiation in the canine cornea.

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Modulation of matrix metalloproteinases by ultraviolet radiation in the canine cornea.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Chandler, Heather L. Kusewitt, Donna F. Colitz, Carmen M. H.
Description	Country affiliation: United States Author Affiliation: Chandler HL ( Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, 1900 Coffey Road, Columbus, OH 43201, USA. chandler.111@osu.edu)
Abstract	PURPOSE: To determine whether ultraviolet (UV) radiation can modulate expression and regulation of matrix metalloproteinases (MMP) in the canine cornea and to examine the expression of MMPs in canine chronic superficial keratitis (CSK). METHODS: Immunohistochemistry for MMP-2 and MMP-9 was performed on samples of CSK. In vitro, canine corneal epithelial cell (CEC) and stromal cell cultures were exposed to UV-irradiation. Following 2, 8 or 24 h, cells were harvested. MMP expression was examined by zymography, and RT-PCR was used to examine expression of Slug and Snail. CEC cultures treated with an EGFR inhibitor or a p38 inhibitor were UV-exposed and harvested 24 h later to examine expression of MMPs, Slug and Snail. RESULTS: Canine CSK had increased immunopositivity for both MMP-2 and MMP-9 compared to normal canine corneas. In vitro, CEC and stromal cell cultures exposed to UV showed generally increased expression of MMP-2, -9, Slug, and Snail; this response was dose and time dependent. Inhibition of the EGFR pathway did not prevent increased expression of MMP-2, -9, Slug or Snail in UV-exposed CEC; however, p38 inhibition did attenuate UV induction. CONCLUSIONS: We have found increased expression of MMPs in clinical samples of CSK compared to normal corneas. In addition, we have shown that there is a temporal association and dose dependency between UV exposure and production of MMPs, Slug, and Snail. These findings suggest that overexpression of MMPs due to UV-exposure may be linked to changes in the cornea that allow an influx of inflammatory cells and vascularization.
File Format	HTM / HTML
ISSN	14635216
Issue Number	3
Volume Number	11
e-ISSN	14635224
Journal	Veterinary Ophthalmology
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2008-05-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Ophthalmology Discipline Veterinary Medicine Cornea Enzymology Matrix Metalloproteinases Metabolism Radiation Effects Tissue Inhibitor Of Metalloproteinases Ultraviolet Rays Animals Cell Culture Techniques Dog Diseases Radiotherapy Dogs Dose-response Relationship, Radiation Immunohistochemistry Veterinary Keratitis Matrix Metalloproteinase 2 Matrix Metalloproteinase 9 Time Factors Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Veterinary

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