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. 1993 Jan;61(1):124–134. doi: 10.1128/iai.61.1.124-134.1993

Effects of cytokines on intracellular growth of Brucella abortus.

X Jiang 1, C L Baldwin 1
PMCID: PMC302696  PMID: 8418034

Abstract

Interleukin 1 alpha (IL-1 alpha), IL-2, IL-4, IL-6, gamma interferon (IFN-gamma), tumor necrosis factor alpha (TNF-alpha), and granulocyte macrophage colony-stimulating factor (GM-CSF) were tested for their abilities to alter the growth of Brucella abortus in BALB/c J774A.1 murine macrophages. IL-1 alpha, IL-4, IL-6, tumor necrosis factor alpha, and granulocyte macrophage-colony-stimulating factor had no consistent or significant effect on the growth of the avirulent B. abortus strain 19. In contrast, the addition of either IFN-gamma or IL-2 at 100 U/ml to the macrophage cultures resulted in a significant reduction in the number of intracellular bacteria that was not attributable to decreased infection rates. With IL-2, the reduction was most often apparent only during the first 24 h after infection, while inhibition with IFN-gamma was apparent throughout the culture period of 48 h. The addition of either IL-2 or IFN-gamma to macrophage cultures also resulted in reduced intracellular CFU of the virulent B. abortus strain 2308 and the attenuated rough mutant B. abortus strain RB51. Inhibition of intracellular growth was not augmented by combinations of cytokines. Additional studies with IFN-gamma and IL-2 indicated that they could mediate the inhibition of intracellular growth of B. abortus in resident and thioglycolate broth-induced BALB/c peritoneal macrophages and in splenic macrophages. IFN-gamma also inhibited bacterial growth when added after infection of the macrophages, although the magnitude of the antibrucellae effects was less than that when it was added before infection. Furthermore, the maximal inhibitory effect was sustained only when IFN-gamma remained in the cultures after infection of the macrophages.

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Selected References

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