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• W2125424452 abstract "The ability of tumor necrosis factor alpha (TNF-alpha) alone and in combination with gamma interferon (IFN-gamma) to inhibit the growth of interferon-sensitive and -resistant Rickettsia prowazekii strains in mouse L929 cells was examined, and the possible role of the nitric oxide synthase pathway in the suppression of rickettsial growth induced by TNF-alpha, IFN-gamma, or both cytokines was evaluated. TNF-alpha inhibited the growth of strains Madrid E (IFN-gamma sensitive and alpha/beta interferon [IFN-alpha/beta] sensitive) and Breinl (IFN-gamma sensitive and IFN-alpha/beta resistant), but not that of strain 83-2P (IFN-gamma resistant and IFN-alpha/beta resistant), in L929 cells. Inhibition of the growth of the Madrid E strain in L929 cells treated with TNF-alpha and IFN-gamma in combination was greater than that observed with either TNF-alpha or IFN-gamma alone. Similarly, inhibition of the growth of the Breinl strain in L929 cells treated with both cytokines was greater than that observed with TNF-alpha alone; however, it did not differ significantly from the inhibition observed with IFN-gamma alone. Although strain 83-2P was resistant to TNF-alpha or IFN-gamma alone, its growth was inhibited in L929 cells treated with TNF-alpha and IFN-gamma in combination. Nitrite production was measured in mock-infected and infected L929 cell cultures, and the nitric oxide synthase inhibitors NG-methyl-L-arginine (NGMA) and aminoguanidine were used to evaluate the role of the nitric oxide synthase pathway in cytokine-induced inhibition of rickettsial growth. Nitrite production was induced in mock-infected or R. prowazekii-infected L929 cell cultures treated with IFN-gamma plus TNF-alpha, but not in mock-infected cultures that were untreated or treated with IFN-gamma or TNF-alpha alone. Nitrite production was also not induced in untreated, R. prowazekii-infected cultures; however, in some instances, it was induced in infected cultures treated with IFN-gamma or TNF-alpha alone. Nitrite production was blocked by NGMA or aminoguanidine, and these compounds markedly relieved the synergistic inhibitory effect of IFN-gamma plus TNF-alpha on the growth of strain 83-2P in L929 cells. In contrast, NGMA did not alleviate the inhibition of the growth of the Madrid E strain in L929 cells treated with IFN-gamma or TNF-alpha alone; however, it slightly and variably relieved the inhibition of the growth of the Madrid E strain in L929 cells treated with IFN-gamma and TNF-alpha in combination.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
• W2125424452 created "2016-06-24" @default.
• W2125424452 creator A5002360938 @default.
• W2125424452 creator A5015012736 @default.
• W2125424452 date "1993-10-01" @default.
• W2125424452 modified "2023-10-17" @default.
• W2125424452 title "Role of the nitric oxide synthase pathway in inhibition of growth of interferon-sensitive and interferon-resistant Rickettsia prowazekii strains in L929 cells treated with tumor necrosis factor alpha and gamma interferon" @default.
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• W2125424452 doi "https://doi.org/10.1128/iai.61.10.4317-4325.1993" @default.
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