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Interleukin-8 (IL-8) is a chemotactic cytokine for neutrophils and lymphocytes. Macrophage inflammatory protein 2 (MIP-2) is a murine counterpart of IL-8. The present study was performed to determine whether MIP-2 aggravates murine myocarditis. We examined (i) the MIP-2-producing activity of encephalomyocarditis (EMC) virus-infected cultured macrophages, (ii) serial plasma MIP-2 levels in EMC virus-induced mice by enzyme-linked immunosorbent assay, and (iii) the effects of antimouse MIP-2 monoclonal antibody (MAb) in vivo upon myocarditis. The production of MIP-2 increased in an infection dose- and time-dependent manner in virus-infected RAW 264. 7 macrophages. Five-week-old C(3)H/He mice were inoculated with EMC virus. Plasma MIP-2 levels were significantly elevated in mice on days 7 and 14 postinfection. Mice were injected subcutaneously with anti-MIP-2 MAb at 10 microg/day (group 2) or 100 microg/day (group 3) on days 0 to 5 and were observed until day 21. Uninfected control mice (group 1) were prepared. The survival rate was higher in the anti-MIP-2-treated group (group 3), but not in group 2, than in the control group. Histopathological analysis revealed that cellular infiltration and myocardial necrosis with macrophage and T-cell accumulation were less prominent in the anti-MIP-2 MAb-treated group, but not in group 2, compared to the level in the controls. MIP-2 is an important naturally occurring inflammatory cytokine in myocarditis, and anti-MIP-2 MAb treatment may prevent the inflammatory response.

journal of virology

Enhanced Production of Macrophage Inflammatory Protein 2 (MIP-2) by In Vitro and In Vivo Infections with Encephalomyocarditis Virus and Modulation of Myocarditis with an Antibody against MIP-2