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Investigative Ophthalmology & Visual Science, Vol 22, 494-501, Copyright © 1982 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Mononuclear cells in the corneal response to endotoxin

EL Howes, VK Cruse and MT Kwok

A severe keratitis can be produced after the direct injection of bacterial endotoxin, or lipopolysaccharide (LPS), in rabbits. Corneal inflammation can progress to scarring and vascularization within a 2 to 3 week period. Pretreatment with systemic adrenal corticosteroids (triamcinolone) prevents this response. Limbal cellular and vascular events were studied during the first 20 hr after injection of LPS in treated and nontreated rabbits. Perivascular limbal inflammatory cells were counted and limbal vascular permeability was assessed by extravasation of 131I-albumin and 125I-fibrinogen in the cornea. Corticosteroids decreased but did not prevent the early protein extravasation and profoundly altered the inflammatory cell population around blood vessels at the limbus. Mononuclear cells, particularly mononuclear phagocytes, were sharply reduced. It is proposed that these cell types play an important role in the perpetuation and amplification of the inflammatory response in this reaction.


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