Crossref journal-article
American Society for Microbiology
Infection and Immunity (235)
Abstract

ABSTRACTMycobacterium tuberculosishas a relatively high resistance to killing by hydrogen peroxide and organic peroxides. Resistance may be mediated by mycobacterial catalase-peroxidase (KatG) and possibly by alkyl hydroperoxide reductase (AhpC). To determine the interrelationship between sensitivity to H2O2, catalase and peroxidase activities, and bacillary growth rates measured both intracellularly in human monocytes and in culture medium, we examined one laboratory strain, two clinical isolates, and three recombinant strains ofM. tuberculosiswith differing levels of KatG and AhpC. Five of the mycobacterial strains had intracellular doubling times of 27 to 32 h, while one KatG-deficient clinical isolate (ATCC 35825) doubled in ∼76 h. Killing of mycobacteria by exogenously added H2O2was more pronounced for intracellular bacilli than for those bacilli derived from disrupted monocytes. Strains with no detectable KatG expression or catalase activity were relatively sensitive to killing (43 to 67% killing) by exogenous H2O2. However, once even minimal catalase activity was present, mycobacterial catalase activity over a 10-fold range (0.56 to 6.2 U/mg) was associated with survival of 85% of the bacilli. Peroxidase activity levels correlated significantly with resistance of the mycobacterial strains to H2O2-mediated killing. An endogenous oxidative burst induction by 4β-phorbol 12β-myristate 13α-acetate treatment of infected monocytes reduced the viability of the KatG null strain (H37Rv Inhr) but not the KatG-overexpressing strain [H37Rv(pMH59)]. These results suggest that mycobacterial resistance to oxidative metabolites (including H2O2and other peroxides) may be an important mechanism of bacillary survival within the host phagocyte.

Bibliography

Manca, C., Paul, S., Barry, C. E., Freedman, V. H., & Kaplan, G. (1999). Mycobacterium tuberculosisCatalase and Peroxidase Activities and Resistance to Oxidative Killing in Human Monocytes In Vitro. Infection and Immunity, 67(1), 74–79.

Authors 5
  1. Claudia Manca (first)
  2. Simon Paul (additional)
  3. Clifton E. Barry (additional)
  4. Victoria H. Freedman (additional)
  5. Gilla Kaplan (additional)
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Dates
Type When
Created 5 years, 8 months ago (Dec. 31, 2019, 10:29 a.m.)
Deposited 1 year, 11 months ago (Sept. 24, 2023, 10:36 a.m.)
Indexed 1 month ago (Aug. 2, 2025, 12:48 a.m.)
Issued 26 years, 8 months ago (Jan. 1, 1999)
Published 26 years, 8 months ago (Jan. 1, 1999)
Published Print 26 years, 8 months ago (Jan. 1, 1999)
Funders 0

None

@article{Manca_1999, title={Mycobacterium tuberculosisCatalase and Peroxidase Activities and Resistance to Oxidative Killing in Human Monocytes In Vitro}, volume={67}, ISSN={1098-5522}, url={http://dx.doi.org/10.1128/iai.67.1.74-79.1999}, DOI={10.1128/iai.67.1.74-79.1999}, number={1}, journal={Infection and Immunity}, publisher={American Society for Microbiology}, author={Manca, Claudia and Paul, Simon and Barry, Clifton E. and Freedman, Victoria H. and Kaplan, Gilla}, editor={Sansonetti, P. J.}, year={1999}, month=jan, pages={74–79} }