Experimental liver injury induced by Propionibacterium acnes and lipopolysaccharide in macrophage colony stimulating factor-deficient osteopetrotic (op/op) mice.
To clarify the involvement of growth and differentiation of liver macrophages mediated by macrophage colony-stimulating factor (M-CSF) in the liver injury induced by Propionibacterium acnes (P. acnes) and lipopolysaccharide (LPS), we used M-CSF-deficient osteopetrotic (op/op) mice. Seven days after injection of P. acnes, granulomas as well as the numbers of Thy-1.2-, Mac-1-, and ERMP-20-positive cells and F4/80-positive areas in the liver were significantly reduced in the op/op mice compared to the normal littermates. After injection of LPS, serum levels of alanine aminotransferase as well as concentrations of IL-1beta and TNF-alpha in the serum and liver were significantly lower in the op/op mice than in the normal littermates, whereas the concentrations of IL-1beta and TNF-alpha in the spleen were similar in op/op mice and normal littermates. These results suggest that M-CSF plays a partial but highly significant role in the development of liver injury induced by P. acnes and LPS via an intrahepatic increase of primed macrophages including those in granulomas, in response to P. acnes, which produce proinflammatory cytokines such as IL-1beta and TNF-alpha.
Nishioji
K
K
Third Department of Internal Medicine, Kyoto Prefectural University of Medicine, Japan.
Okanoue
T
T
Mori
T
T
Sakamoto
S
S
Itoh
Y
Y
D000410:Alanine Transaminase / Q000378:metabolism; D000818:Animals; D006099:Granuloma / Q000209:etiology / Q000378:metabolism / Q000473:pathology; D007375:Interleukin-1 / Q000378:metabolism; D008070:Lipopolysaccharides / Q000633:toxicity*; D008099:Liver / Q000378:metabolism / Q000473:pathology*; D016173:Macrophage Colony-Stimulating Factor / Q000172:deficiency*; D008264:Macrophages / Q000378:metabolism; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D010022:Osteopetrosis / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D011425:Propionibacterium acnes; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
D007375:Interleukin-1; D008070:Lipopolysaccharides; D014409:Tumor Necrosis Factor-alpha; D016173:Macrophage Colony-Stimulating Factor; D000410:Alanine Transaminase