Molecular mechanisms of topical anti-inflammatory effects of lipoxin A(4) in endotoxin-induced uveitis

Molecular Pharmacology
Rodrigo MedeirosJoão Batista Calixto

Abstract

Lipoxin A(4) (LXA(4)) is a lipid mediator that plays an important role in inflammation resolution. We assessed the anti-inflammatory effect of LXA(4) on endotoxin-induced uveitis (EIU) in rats. The inflammatory cell number and levels of tumor necrosis factor-alpha (TNF-alpha), interleukin-1beta (IL-1beta), prostaglandin E(2) (PGE(2)), and protein, as well as expression of cyclooxygenase-2 (COX-2) and vascular endothelial growth factor (VEGF), in the anterior chamber of the eye were determined 24 h after lipopolysaccharide (LPS; 200 mug/paw) intradermal injection. The immunohistochemical reactivities of nuclear factor-kappaB (NF-kappaB) and c-Jun were also examined. Topical LXA(4) (1-10 ng/eye) pretreatment decreased the number of inflammatory cells and the protein leakage into the aqueous humor (AqH). In addition, topical LXA(4) (10 ng/eye) inhibited the LPS-induced production of IL-1beta, TNF-alpha, and PGE(2), and expression of COX-2 and VEGF. A decreased activation of NF-kappaB and c-Jun was also found in LXA(4)-treated eyes. It is very interesting that an anti-inflammatory effect was achieved even when LXA(4) (10 ng/eye) was applied topically after LPS challenge, as indicated by the reduction in the cellular and protein ext...Continue Reading

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