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- W2029279329 abstract "To investigate whether stimulation with lipopolysaccharide (LPS) alters cytokine production by splenocytes in mice and whether it changes the T-helper 1 (Th1)/Th2 balance. The role of nitric oxide in such immunologic changes was also explored using mice with genetic lack of inducible nitric oxide synthase (iNOS).: Prospective animal study with concurrent controls.University research laboratory.iNOS knockout mice and wild-type littermates.iNOS knockout mice or wild-type mice were injected with LPS or saline with or without anti-interleukin (IL)-6 antibody, and survival was monitored for 7 days.At 24 and 48 hrs after administration, blood samples and splenocytes were obtained to examine immunologic variables. Cell surface markers and cytokine expression of splenocytes were used to characterize the Th1/Th2 balance and were measured by flow cytometry. At 48 hrs after LPS administration, the Th1/Th2 balance shifted toward Th2 predominance in wild-type mice, irrespective of the IL-6 level, whereas it showed Th1 predominance in iNOS knockout mice, and the increase of IL-6 and IL-10 in response to LPS persisted in these animals. After LPS administration, the mortality rate was significantly higher in iNOS knockout mice than in wild-type mice, irrespective of the IL-6 level.These findings suggest that nitric oxide produced by iNOS during endotoxemia may be involved in down-regulation of Th1 cytokines and up-regulation of Th2 cytokines, whereas IL-6 has no such role. The increased lethality of LPS in iNOS knockout mice suggests that nitric oxide may be protective against proinflammatory cytokine-induced damage. Nitric oxide excess may increase susceptibility to nosocomial infections, so-called immunoparalysis." @default.
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- W2029279329 date "2005-04-01" @default.
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- W2029279329 title "Immune dysfunction in endotoxicosis: Role of nitric oxide produced by inducible nitric oxide synthase*" @default.
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- W2029279329 doi "https://doi.org/10.1097/01.ccm.0000159200.69314.3a" @default.
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