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. 1994 Dec;62(12):5267–5274. doi: 10.1128/iai.62.12.5267-5274.1994

Live Brucella spp. fail to induce tumor necrosis factor alpha excretion upon infection of U937-derived phagocytes.

E Caron 1, T Peyrard 1, S Köhler 1, S Cabane 1, J P Liautard 1, J Dornand 1
PMCID: PMC303264  PMID: 7960104

Abstract

Tumor necrosis factor alpha (TNF-alpha) plays a central role in activation of first-line defenses of a host against foreign organisms. To determine whether Brucella infection modulated TNF-alpha production, we measured the biological activity of this cytokine in supernatants of U937 cell-derived macrophages and of fresh human monocytes infected with Brucella spp. Neither the smooth nor rough Brucella strains used induced any measurable TNF-alpha excretion upon infection. On the contrary, as reported before for other gram-negative bacteria, phagocytosis of nonpathogenic Escherichia coli was followed by a rapid and transient induction of TNF-alpha release, suggesting an involvement of this cytokine in some autocrine process. As expected, the Brucella strains tested survived and/or multiplied within U937-derived macrophages, whereas E. coli was rapidly eliminated after phagocytosis. Immunoglobulin G opsonization of E. coli strains enhanced their intracellular killing and strongly potentiated TNF-alpha secretion. Immunoglobulin G opsonization of Brucella strains, in contrast, did not lead to TNF-alpha production, although their rate of intracellular multiplication was reduced. Killed brucellae, however, promoted a significant excretion of TNF-alpha from U937-derived macrophages into cell culture supernatants. We finally demonstrated that pretreatment of U937-derived macrophages with exogenous TNF-alpha significantly inhibited intracellular multiplication of Brucella spp. These results and experiments performed on fresh human monocytes or with isolated lipopolysaccharide (LPS) showed that (i) differences in TNF-alpha production observed during macrophage infection by Brucella spp. and E. coli were not due to differences in LPS structure but resulted from active inhibition of TNF-alpha production by a specific process linked to Brucella spp. and (ii) the capacity of Brucella spp. to use pathways avoiding TNF-alpha production during infection may be considered a major attribute of virulence.

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Selected References

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