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(Journal of Leukocyte Biology. 2001;69:149-157.)
© 2001 by Society for Leukocyte Biology

Autocrine action of IL-10 suppresses proinflammatory mediators and inflammation in the HSV-1-infected cornea

Department of Microbiology and Immunology, School of Medicine, University of South Alabama, Mobile, Alabama

Correspondence: Dr. Robert N. Lausch, Department of Microbiology and Immunology, College of Medicine, University of South Alabama, Mobile, AL 36688. E-mail: rlausch{at}jaguer1.usouthal.edu

We investigated whether IL-10 produced endogenously would influence the development of HSV-1-induced acute corneal disease. Murine corneal epithelial cells and fibroblasts cultured in vitro expressed IL-10 mRNA and protein constitutively and also IL-10 receptors. Inclusion of IL-10 neutralizing antibody in the culture medium significantly (p<0.05) enhanced TNF--induced IL-6 and MIP-2 production by both corneal cell types. Endogenous IL-10 synthesis, which also occurred in vivo, was not modulated by Herpes virus infection or by depletion of neutrophils or natural killer cells. Antibody to IL-10 given locally at the time of HSV-1 intracorneal infection was associated with significantly (p<0.05) enhanced production of IL-6, MIP-2, and MIP-1, increased neutrophil infiltration, and more extensive corneal disease. Similarly, mice with a disrupted IL-10 gene developed more severe corneal disease than wild-type controls. Collectively, these observations suggest that locally produced IL-10 can act in an autocrine/paracrine fashion to down-regulate the production of proinflammatory mediators and thus limit corneal inflammation.

Key Words: cytokines • chemokines • IL-10 knockout mice • IL-10 receptor • corneal fibroblasts • corneal epithelial cells

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