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Mycobacterium tuberculosis increases IP-10 and MIG protein despite inhibition of IP-10 and MIG transcription. | LitMetric

AI Article Synopsis

Article Abstract

Mycobacterium tuberculosis (MTB) has evolved methods to evade interferon-gamma (IFNγ) mediated protection. We sought to determine the effect of MTB infection on expression of IFNγ-inducible Protein 10 (IP-10) and Monokine Induced by IFNγ (MIG), two chemokines involved in host defense. MTB infection of THP-1 cells inhibited the transcription of IP-10 and MIG. A key mechanism for the inhibition is the disruption of binding of Signal Transduction and Activation of Transcription 1-alpha (STAT1α) to its cis-regulatory element, present in the 5'-flanking region of both IP-10 and MIG promoters. Use of inhibitors specific to the nuclear factor-kappa B (NFκB) and p38 mitogen-activated protein kinase (p38(mapk)) implicate these two signaling pathways in mediating the effect of MTB on the inhibition of IFNγ-induced IP-10 and MIG mRNA expression. Interestingly, despite transcriptional inhibition, there was an unexpected increase in IP-10 and MIG protein production after combined IFNγ and MTB stimulation. MTB also inhibited IFNγ induction of MIG mRNA but augmented MIG protein in primary human monocyte-derived macrophages. The synergy between MTB and IFNγ in the induction of IP-10 and MIG protein appears to involve novel post-transcriptional events that incorporates non-canonical functions of NFκB and p38(mapk).

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http://dx.doi.org/10.1016/j.tube.2010.11.005DOI Listing

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