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We compared the effects of LPSs from P. gingivalis and P. heparinolytica on the induction of tumor necrosis factor-alpha (TNF-alpha) production by murine peritoneal macrophages. The lipopolysaccharide (LPS) preparation from P. gingivalis showed a typical ladder pattern in SDS-PAGE, whereas that from P. heparinolytica formed several stained bands without a ladder pattern. When the macrophages from C3H/HeJ mice were incubated with P. gingivalis LPS, the level of TNF-alpha released in the culture supernatants was significantly higher than that with P. heparinolytica. All tested reagents except genistein strongly inhibited the production of TNF-alpha by the macrophages after induction by either LPS. These results suggested the following possibilities, i) the induction level of TNF-alpha by P. heparinolytica is similar to that of Salmonella minnesota, ii) tyrosine phosphorylation is not the only pathway for the TNF-alpha production induced by these LPSs, iii) different regulatory mechanisms are involved in TNF-alpha production in P. gingivalis LPS stimulated and P. heparinolytica LPS stimulated cells.

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Differences in TNF-.ALPHA. Producing Activity from Murine Peritoneal Macrophages Induced by Lipopolysaccharides of Prevotella heparinolytica and Porphyromonas gingivalis.