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American Journal of Pathology, Vol 144, 1381-1392, Copyright © 1994 by American Society for Investigative Pathology

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The role of macrophage colony-stimulating factor in hepatic glucan- induced granuloma formation in the osteopetrosis mutant mouse defective in the production of macrophage colony-stimulating factor

K Takahashi, M Naito, S Umeda and LD Shultz
Second Department of Pathology, Kumamoto University School of Medicine, Japan.

To elucidate the effects of macrophage colony-stimulating factor (M- CSF) on Kupffer cells and monocyte/macrophages in hepatic granuloma formation, we examined granulomas produced by glucan injection in the liver of osteopetrotic mice and littermates with or without M-CSF administration. In the osteopetrotic mice, monocytes were deficient in peripheral blood, and their number did not increase after glucan injection. Hepatic granulomas were formed in the osteopetrotic mice by glucan injection without a supply of blood monocytes. During this process, M-CSF-independent Kupffer cells proliferated, particularly before the granuloma formation, clustered in the hepatic sinusoid, and transformed into epithelioid cells and multinuclear giant cells. In the M-CSF-treated osteopetrotic mice, glucan injection induced an increase in the number of blood monocytes and formed hepatic granulomas at a nearly similar degree to that of littermate mice. Thus, it is concluded that neither monocytes nor M-CSF are necessary for granuloma formation. In contrast, Kupffer cells play a crucial role as granulomas develop in M-CSF-uninjected osteopetrotic mice.

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