Induction of inflammatory cytokines by a soluble moiety prepared from an enzyme lysate of Actinomyces viscosus cell walls.
A carbohydrate-rich and immunobiologically active component, M1Av, was prepared from an M-1 endo-N-acetylmuramidase digest of cell walls of Actinomyces viscosus ATCC 19246 by CM Sephadex C-25 and Sephadex G-100 chromatography. M1Av stimulated thioglycolate-induced peritoneal macrophages from C3H/HeN and C3H/HeJ mice to release cell-free tumour necrosis factor (TNF) and interleukin (IL)-6, and a cell-associated thymocyte activating factor, probably IL-1. An intravenous (i.v.) injection of M1Av induced increased levels of TNF and IL-6 in the serum of C3H/HeN mice that had been primed with 100 micrograms of muramyldipeptide (MDP) i.v. However, M1Av did not induce TNF release in C3H/HeJ mice similarly primed with MDP. Simultaneous administration of M1Av (100 micrograms, i.v.) and galactosamine (18 mg, intraperitoneally) killed C3H/HeN, but not C3H/HeJ mice. M1Av was shown to be practically free of endotoxin by the Limulus test. These findings indicate that the solubilised A. viscosus cell-wall carbohydrate moiety induced inflammatory cytokines both in vitro and in vivo.
Department of Oral Microbiology, Osaka University Faculty of Dentistry, Japan.
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Takada
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Kimura
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Hamada
D016924:Actinomyces viscosus / Q000737:chemistry*; D000818:Animals; D000942:Antigens, Bacterial / Q000494:pharmacology*; D002473:Cell Wall / Q000737:chemistry*; D002478:Cells, Cultured; D016207:Cytokines / Q000096:biosynthesis*; D005260:Female; D007249:Inflammation / Q000276:immunology*; D015850:Interleukin-6 / Q000096:biosynthesis; D008264:Macrophages / Q000187:drug effects / Q000378:metabolism; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis
D000942:Antigens, Bacterial; D016207:Cytokines; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha