Journal
MICROBIOLOGYOPEN
Volume 2, Issue 6, Pages 901-911Publisher
WILEY
DOI: 10.1002/mbo3.126
Keywords
Hydrogen peroxide; isoniazid; Mycobacterium tuberculosis; nitrate reductase; nitrite
Categories
Funding
- National Institute of General Medical Sciences of the National Institutes of Health [GM07739]
- William Randolph Hearst Foundation
Ask authors/readers for more resources
When access to molecular oxygen is restricted, Mycobacterium tuberculosis (Mtb) can respire an alternative electron acceptor, nitrate. We found that Mtb within infected primary human macrophages in vitro at physiologic tissue oxygen tensions respired nitrate, generating copious nitrite. A strain of Mtb lacking a functioning nitrate reductase was more susceptible than wild-type Mtb to treatment with isoniazid during infection of macrophages. Likewise, nitrate reductase-deficient Mtb was more susceptible to isoniazid than wild-type Mtb in axenic culture, and more resistant to hydrogen peroxide. These phenotypes were reversed by the addition of exogenous nitrite. Further investigation suggested that nitrite might inhibit the bacterial catalase. To the extent that Mtb itself is the most relevant source of nitrite acting within Mtb, these findings suggest that inhibitors of Mtb's nitrate transporter or nitrate reductase could enhance the efficacy of isoniazid.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available