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Folia Microbiologica

, Volume 45, Issue 5, pp 457–463 | Cite as

Interferon-γ- and lipopolysaccharide-induced tumor necrosis factor-α is required for nitric oxide production: Tumor necrosis factor-α and nitric oxide are independently involved in the killing ofMycobacterium microti in interferon-γ-and lipopolysaccharide-treated J774A.1 cells

  • S. Majumdar
  • R. Gupta
  • N. Dogra
Papers

Abstract

A comparative study was done using J774A.1 and J774A. 1-derived transfected cells (J774A.1 C.1) containing antisense tumor necrosis factor α (TNF-α) plasmid to determine the role of endogenous TNF-α on nitric oxide production as well as on the growth ofMycobacterium microti in interferon γ (IFN-γ)- and lipopolysaccharide (LPS)-treated cells. On stimulation with IFN-γ and LPS a higher level of NO was observed in J774A.1 cells compared to J774A.1 C.1 which indicated that endogenous TNF-α is required for the production of NO. Comparing the effect of IFN-γ and LPS on the intracellular growth ofM. microti, the growth-reducing activity was higher in J774A.1 cells than in J774A.1 C.1 cells and was not completely abrogated in the presence of the nitric oxide inhibitorN G-methyl-l-arginine (l-NMA). J774A.1 C.1 cells infected withM. microti produced a significant amount of NO when exogenous TNF-α was added along with IFN-γ and LPS and the concentration of intracellular bacteria decreased almost to that in IFN-γ and LPS treated parental J774A.1 cells. Addition of exogenous TNF-α even in the presence ofl-NMA in J774.1 C.1 cells could also partially restore intracellular growth inhibition ofM. microti caused by IFN-γ and LPS. TNF-α is probably required for the production of NO in J774A.1 cells by IFN-γ and LPS but TNF-α and NO are independently involved in the killing of intracellularM. microti with IFN-γ and LPS.

Keywords

Nitric Oxide eDNA Intracellular Growth Reactive Nitrogen Intermediate Nitric Oxide Inhibitor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Folia Microbiologica 2000

Authors and Affiliations

  • S. Majumdar
    • 1
  • R. Gupta
    • 1
  • N. Dogra
    • 1
  1. 1.Institute of Microbial TechnologyChandigarhIndia

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