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http://dx.doi.org/10.5352/JLS.2008.18.11.1471

Impaired Functions of Lymphocytes on Nitric Oxide Production in Endotoxin- Tolerant Mice  

Gil, Young-Gi (Department of Anatomy, Kosin University College of Medicine)
Kang, Mi-Kyung (Institute for Medical Science, Kosin University College of Medicine)
Publication Information
Journal of Life Science / v.18, no.11, 2008 , pp. 1471-1478 More about this Journal
Abstract
In this study, nitric oxide (NO) production in a macrophage-lymphocyte co-culture system was used to assess the cytokine producing capability of cells during endotoxin tolerance in mice. Incubation of peritoneal macrophages with interferon-$\tau$ (IFN-$\tau$) in the presence of lipopolysaccharide (LPS) augmented NO synthesis. Exogenous tumor necrosis factor-$\alpha$(TNF-$\alpha$) could also replace LPS for the stimulation of NO production. Macrophages co-cultured with splenic lymphocytes showed augmented NO synthesis by LPS alone. However, pretreatment of mice with 2.5 mg/kg LPS completely prevented the lethality and the increase of blood TNF-$\alpha$ and IFN-$\tau$ after the second challenge with a lethal dose of LPS. In addition, when macrophages prepared from LPS-tolerant mice were co-cultured with normal splenocytes, LPS also could not induce the production of NO, even in the presence of exogenous TNF-$\alpha$. Moreover, when normal macrophages were co-cultured with splenocytes obtained from LPS-tolerant mice, stimulation with LPS could not evoke the NO production enhancement. However, this down-regulation was able to reverse by exogenous IFN-$\tau$ or concanavalin A (ConA), a stimulator of IFN-$\tau$ production. Our results indicate that not only macrophages but also lymphocytes contribute to LPS tolerance. As INF-$\tau$ can enhance the expression of TNF-$\alpha$, the decrease of INF-$\tau$synthesis from lymphocytes may orchestrate with the decrease of TNF-$\alpha$ synthesis from LPS-tolerant macrophages for the production of tolerant state and the prevention of excessive inflammation. Therefore, LPS tolerance may be exploited for prophylaxis of severe sepsis in patients at risk.
Keywords
Endotoxin tolerance; interferon-$\tau$; lymphocyte; lipopolysaccharide; nitric oxide;
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