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Inhibition of inducible nitric oxide synthase protects against liver injury induced by mycobacterial infection and endotoxins

Olleros, Maria
Vesin, Dominique
Parapanov, Roumen
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Published in Journal of Hepatology. 2004, vol. 41, no. 5, p. 773-781
Abstract BACKGROUND/AIMS: Bacillus Calmette Guerin (BCG) infection causes hepatic injury following granuloma formation and secretion of cytokines which render mice highly sensitive to endotoxin-mediated hepatotoxicity. This work investigates the role of inducible nitric oxide synthase (iNOS) in liver damage induced by BCG and endotoxins in BCG-infected mice. METHODS: Liver injury and cytokine activation induced by BCG and by LPS upon BCG infection (BCG/LPS) were compared in wild-type and iNOS-/- mice. RESULTS: iNOS-/- mice infected with living BCG are protected from hepatic injury when compared to wild-type mice which express iNOS protein in macrophages forming hepatic granulomas. In addition, iNOS-/- mice show a decrease in BCG-induced IFN-gamma serum levels. LPS challenge in BCG-infected mice strongly activates iNOS in the liver and spleen of wild-type mice which show important liver damage associated with a dramatic increase in TNF and IL-6 and also Th1 type cytokines. In contrast, iNOS-/- mice are protected from liver injury after BCG/LPS challenge and their TNF, IL-6 and Th1 type cytokine serum levels raise moderately. CONCLUSIONS: These results demonstrate that nitric oxide (NO) from iNOS is involved in hepatotoxicity induced by both mycobacterial infection and endotoxin effects upon BCG infection and that inhibition of NO from iNOS protects from liver injuries.
Keywords AnimalsInterleukin-6/metabolismLipopolysaccharides/*pharmacologyLiver/enzymologyLiver Diseases/immunology/*metabolism/microbiologyMiceMice, Inbred C57BLMice, Knockout*Mycobacterium bovisNitric Oxide/metabolismNitric Oxide Synthase/*genetics/metabolismNitric Oxide Synthase Type IISpleen/enzymologyTh1 Cells/metabolismTuberculosis/immunology/*metabolismTumor Necrosis Factor-alpha/metabolism
PMID: 15519650
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GULER, Reto et al. Inhibition of inducible nitric oxide synthase protects against liver injury induced by mycobacterial infection and endotoxins. In: Journal of hepatology, 2004, vol. 41, n° 5, p. 773-781. doi: 10.1016/j.jhep.2004.07.031

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Deposited on : 2010-08-27

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