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(Investigative Ophthalmology and Visual Science. 1999;40:2275-2282.)
© 1999 by The Association for Research in Vision and Ophthalmology, Inc.

Inhibition of Endotoxin-Induced Uveitis and Potentiation of Local TNF-{alpha} and Interleukin-6 mRNA Expression by Interleukin-13

Olivier Marie1,2, Brigitte Thillaye-Goldenberg1, Marie-Christine Naud1 and Yvonne de Kozak1

1 From the INSERM U450, Development, Aging and Pathology of the Retina, Paris, France; and 2 Department of Ophthalmology, University of Nantes, France.

Abstract

PURPOSE. To investigate the effect of systemic injections of interleukin (IL)-13 on the development of endotoxin-induced uveitis (EIU) in the rat.

METHODS. EIU was induced in Lewis rats by a single footpad injection of lipopolysaccharide (LPS; 350 µg/kg) from Salmonella typhimurium. Rats were treated with a subcutaneous injection in the back of recombinant human IL-13 (50 µg/kg in 0.2 ml of saline) performed 30 minutes before LPS injection and 6 and 10 hours afterward. At 23 hours after LPS injection, EIU was evaluated by slit-lamp examination and by counts of inflammatory cells on cryostat sections after specific immunostaining. The expression of nitric oxide synthase (NOS)–II in ocular tissues was determined by dual immunofluorescent staining and the release of nitrite in aqueous humor by Griess reaction. Cytokine gene expression in the iris/ciliary body, choroid, and retina was evaluated by reverse transcription–polymerase chain reaction.

RESULTS. At 24 hours after LPS injection, significant clinical inhibition of ocular inflammation and fibrin deposition in the eye was observed in IL-13–treated rats. Quantitative analysis of ocular tissues revealed a significant decrease of OX-42+ cells (microglia, activated macrophages, dendritic cells, and polymorphonuclear leukocytes) and ED-1+ cells (monocytes/macrophages and dendritic cells). No effect on ED2+ cells (resident tissue macrophages) was found. Treatment with IL-13 decreased nitrite levels in aqueous humor and enhanced the expression of tumor necrosis factor-{alpha} (TNF-{alpha}) and IL-6 mRNA in ocular tissues.

CONCLUSIONS. Interleukin-13 treatment inhibits LPS-induced ocular inflammation with inhibition of nitrite release and increased TNF and IL-6 production in the eye. These results confirm the role of the NO pathway in the pathogenesis of EIU and suggest the involvement of TNF and IL-6 in the downregulation of ocular inflammation.




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