1887

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Volume 66, Issue 7

hypoxic response protein 1 (Hrp1) augments the pro-inflammatory response and enhances the survival of in murine macrophages Free

Abstract

The DosR/DosS two-component regulatory system of regulates the expression of numerous genes under stress conditions and is important for the long-term survival of in the host. The rv2626c gene of is one of the most strongly induced transcripts of the dormancy regulon. This study focused on the immunological effects and possible function of Rv2626c in maintaining mycobacterial survival under various stress conditions.

We heterologously expressed the Rv2626c protein in by constructing a recombinant strain Ms_rv2626c. The viability of Ms_rv2626c was evaluated both and . Different stress conditions, including acidified sodium nitrite, malachite green, low pH, SDS and lysozyme, were used to evaluate the effect of Rv2626c on bacterial resistance. An assay using a macrophage infection model was utilized to investigate the potential effect of Rv2626c to alter the immune response of host cell and its associated pathways. The effect of Rv2626c on cell necrosis was also explored.

The expression of Rv2626c-enhanced survival under hypoxia and nitric oxide stress , and this enhancement was maintained within macrophages and in mouse tissues. In addition, macrophages infected with expressing Rv2626c showed significantly higher interleukin-1β (IL-1β), IL-6, tumour necrosis factor-α (TNF-α) and inducible nitric oxide synthase (iNOS) expression, as well as a higher level of cell necrosis, compared with the control.

protein Rv2626c plays a significant role in stimulating macrophages to provoke a pro-inflammatory response and in mycobacterial survival during infection.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): DosR/DosS , hypoxia , Mycobacterium smegmatis , Mycobacterium tuberculosis and rv2626c
© 2017 The Authors
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2017-07-01
2024-04-25
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Mycobacterium tuberculosis hypoxic response protein 1 (Hrp1) augments the pro-inflammatory response and enhances the survival of Mycobacterium smegmatis in murine macrophages
J. Med. Microbiol. 66, 1033 (2017); https://doi.org/10.1099/jmm.0.000511
/content/journal/jmm/10.1099/jmm.0.000511
/content/journal/jmm/10.1099/jmm.0.000511
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