We previously reported that F4/80+ Kupffer cells are subclassified into CD68+ Kupffer cells with phagocytic and ROS producing capacity, and CD11b+ Kupffer cells with cytokine-producing capacity. Carbon tetrachloride (CCl4)-induced hepatic injury is a well-known chemical-induced hepatocyte injury. In the present study, we investigated the immunological role of Kupffer cells/macrophages in CCl4-induced hepatitis in mice. The immunohistochemical analysis of the liver and the flow cytometry of the liver mononuclear cells showed that clodronate liposome (c-lipo) treatment greatly decreased the spindle-shaped F4/80+ or CD68+ cells, while the oval-shaped F4/80+ CD11b+ cells increased. Notably, severe hepatic injury induced by CCl4 was further aggravated by c-lipo-pretreatment. The population of CD11b+ Kupffer cells/macrophages dramatically increased 24 hour (h) after CCl4 administration, especially in c-lipo-pretreated mice. The CD11b+ Kupffer cells expressed intracellular TNF and surface Fas-ligand (FasL). Furthermore, anti-TNF Ab pretreatment (which decreased the FasL expression of CD11b+ Kupffer cells), anti-FasL Ab pretreatment or gld/gld mice attenuated the liver injury induced by CCl4. CD1d？/？ mouse and cell depletion experiments showed that NKT cells and NK cells were not involved in the hepatic injury. The adoptive transfer and cytotoxic assay against primary cultured hepatocytes confirmed the role of CD11b+ Kupffer cells in CCl4-induced hepatitis. Interestingly, the serum MCP-1 level rapidly increased and peaked at six h after c-lipo pretreatment, suggesting that the MCP-1 produced by c-lipo-phagocytized CD68+ Kupffer cells may recruit CD11b+ macrophages from the periphery and bone marrow. The CD11b+ Kupffer cells producing TNF and FasL thus play a pivotal role in CCl4-induced acute hepatic injury.
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