Abstract
Tuberculosis is a common and often deadly infectious disease caused by mycobacteria, mainly Mycobacterium tuberculosis and infrequently by other subspecies of the M. tuberculosis complex, such as M. bovis. Sodium hypochlorite (bleach) is routinely used in hospitals and health care facilities for surface sterilization; however, the modes of action of bleach on M. bovis BCG and how this organism develops resistance to sodium hypochlorite have not been elucidated. In this study, we performed a global toxicogenomic analysis of the M. bovis response to 2.5 mM sodium hypochlorite after 10 and 20 min. M. bovis BCG growth was monitored by measuring the quantity of ATP in picomoles produced over a short exposure time (10–60 min) to sodium hypochlorite. This study revealed significant regulation of oxidative stress response genes of M. bovis BCG, such as oxidoreductase, peroxidase, heat shock proteins and lipid transport, and metabolism genes. We interpreted this response as a potentially more lethal interplay between fatty acid metabolism, sulfur metabolism, and oxidative stress. Our results also suggest that sodium hypochlorite repressed transcription of genes involved in cell wall synthesis of M. bovis. This study shows that the treatment of M. bovis BCG with bleach inhibits the biosynthesis of outer cell wall mycolic acids and also induces oxidative damage.
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Acknowledgements
This research is supported by the US Environmental Protection Agency Grant number T-83284001-2. Although the research described in this paper has been funded wholly by the US Environmental Protection Agency, it has not been subjected to the Agency’s peer and administrative review and, therefore, may not necessarily reflect the views of the EPA nor does the mention of trade names or commercial products constitute endorsement of recommendation of use.
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Supplement Figure 1
Standard curve showing the correlation between ATP measurements in relative light units (RLU) and picomoles (GIF 141 Kb).
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Jang, HJ., Nde, C., Toghrol, F. et al. Global transcriptome analysis of the Mycobacterium bovis BCG response to sodium hypochlorite. Appl Microbiol Biotechnol 85, 127–140 (2009). https://doi.org/10.1007/s00253-009-2208-0
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DOI: https://doi.org/10.1007/s00253-009-2208-0