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. 1997 Jun;65(6):2100–2106. doi: 10.1128/iai.65.6.2100-2106.1997

Temporal effect of tumor necrosis factor alpha on murine macrophages infected with Mycobacterium avium.

I S Eriks 1, C L Emerson 1
PMCID: PMC175290  PMID: 9169738

Abstract

Members of the Mycobacterium avium complex are a family of bacteria that persist within macrophages in the face of an immune response. Elimination of these organisms is likely due to cytokine-induced macrophage activation. Because macrophage activation by tumor necrosis factor alpha (TNF-alpha) appears critical for killing of intracellular M. avium, early downregulation of TNF-alpha levels in infected macrophages has been suggested as a survival mechanism for virulent strains of M. avium. We examined the relationship between TNF-alpha and growth of M. avium strains of differing virulence, as measured by their ability to grow in murine bone marrow-derived macrophages. When exogenous TNF-alpha was added immediately following macrophage infection, significant growth inhibition of virulent M. avium strains was observed. If TNF-alpha addition was delayed by 24 h or more, growth inhibition was abrogated. To determine if early downregulation of TNF-alpha levels could explain the differential growth of virulent and avirulent strains, levels of TNF-alpha and prostaglandin E2 (PGE2), which has been shown to suppress TNF-alpha production in uninfected macrophages, were quantified over time. Upregulation of both TNF-alpha and PGE2, as measured by enzyme-linked immunosorbent assay, was evident by 6 h postinfection, indicating that the ability of M. avium to replicate in macrophages was not directly correlated with early downregulation of TNF-alpha production. However, TNF-alpha bioactivity, as measured by cytotoxicity, was significantly decreased in virulent M. avium strains at all time periods examined. Treatment of infected macrophages with gamma interferon immediately after infection resulted in significantly increased levels of nitric oxide but did not affect the growth of virulent M. avium strains. These results suggest that while significant levels of TNF-alpha are present in supernatants from all M. avium strains, levels of biologically active TNF-alpha are significantly reduced in supernatants from virulent M. avium strains. Preliminary results suggest that upregulation of the soluble p75 TNF receptor may be one mechanism by which TNF-alpha bioactivity reduction occurs.

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Selected References

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