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Cell Host Microbe. 2008 May 15;3(5):323-30. doi: 10.1016/j.chom.2008.03.007.

Mycobacterium tuberculosis senses host-derived carbon monoxide during macrophage infection.

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  • 1Department of Medicine, Division of Infectious Diseases, University of California, San Francisco, San Francisco, CA 94158, USA.

Abstract

Mycobacterium tuberculosis (MTB) expresses a set of genes known as the dormancy regulon in vivo. These genes are expressed in vitro in response to nitric oxide (NO) or hypoxia, conditions used to model MTB persistence in latent infection. Although NO, a macrophage product that inhibits respiration, and hypoxia are likely triggers in vivo, additional cues could activate the dormancy regulon during infection. Here, we show that MTB infection stimulates expression of heme oxygenase (HO-1) by macrophages and that the gaseous product of this enzyme, carbon monoxide (CO), activates expression of the dormancy regulon. Deletion of macrophage HO-1 reduced expression of the dormancy regulon. Furthermore, we show that the MTB DosS/DosT/DosR two-component sensory relay system is required for the response to CO. Together, these findings demonstrate that MTB senses CO during macrophage infection. CO may represent a general cue used by pathogens to sense and adapt to the host environment.

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PMID:
18474359
[PubMed - indexed for MEDLINE]
PMCID:
PMC2873178
Free PMC Article
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