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. 2004 Dec;13(5-6):343–348. doi: 10.1155/S096293510400050X

Role of type I interferon in the bacillus Calmette-Guérin-induced expression of CXCL10 from human monocytes.

Patricia Méndez Samperio 1, Artemisa Trejo 1, Elena Miranda 1
PMCID: PMC1781576  PMID: 15770050

Abstract

BACKGROUND: The proinflammatory chemokine CXCL10, in addition to its chemotactic properties, is also involved in the stimulation of natural killer and T-cell migration in Mycobacterium tuberculosis infection. In this study, our experiments were designed to determine the role of interferon (IFN)-alphabeta in the production of CXCL10 by human monocytes infected with Mycobacterium bovis bacillus Calmette-Guerin (BCG). METHODS: The concentrations of CXCL10 in culture supernatants of monocytes infected with M. bovis BCG were determined by enzyme-linked immunosorbent assay. CXCL10 mRNA levels were determined by the reverse transcription-polymerase chain reaction method. RESULTS: We have shown the induction of CXCL10 following infection with M. bovis BCG in a dose-dependent and time-dependent manner. Importantly, the secretion of CXCL10 in response to M. bovis was increased by IFN-alpha. These results were further confirmed by the fact that the addition of an anti-IFN-alphabeta neutralizing antibody completely reversed the stimulatory effect, whereas an isotype-matched control antibody had no significant effect on CXCL10 secretion. It is important to note that no significant effect of type I IFN on CXCL8 production in M. bovis-infected monocytes was observed. This was consistent with the finding by the reverse transcription-polymerase chain reaction method that treatment with anti-IFN-alpha/beta antibodies potentially inhibited CXCL10 mRNA levels, whereas no significant effect was observed on CXCL8 mRNA. Moreover, in THP-1 monocytes and THP-1 macrophages, the addition of exogenous IFN-alpha stimulated CXCL10 secretion. CONCLUSIONS: Collectively, these results indicate that the type I IFN may play an important role to modulate the expression of CXCL10 in M. bovis BCG infection. Studies on M. bovis-induced chemokine secretion could provide important insight into the regulation of the immune response against tuberculosis.

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