Escape of Mycobacterium tuberculosis from oxidative killing by neutrophils

B Corleis, D Korbel, R Wilson, J Bylund… - Cellular …, 2012 - Wiley Online Library
B Corleis, D Korbel, R Wilson, J Bylund, R Chee, UE Schaible
Cellular microbiology, 2012Wiley Online Library
Neutrophils enter sites of infection, where they can eliminate pathogenic bacteria in an
oxidative manner. Despite their predominance in active tuberculosis lesions, the function of
neutrophils in this important human infection is still highly controversial. We observed that
virulent Mycobacterium tuberculosis survived inside human neutrophils despite prompt
activation of these defence cells' microbicidal effectors. Survival of M. tuberculosis was
accompanied by necrotic cell death of infected neutrophils. Necrotic cell death entirely …
Summary
Neutrophils enter sites of infection, where they can eliminate pathogenic bacteria in an oxidative manner. Despite their predominance in active tuberculosis lesions, the function of neutrophils in this important human infection is still highly controversial. We observed that virulent Mycobacterium tuberculosis survived inside human neutrophils despite prompt activation of these defence cells' microbicidal effectors. Survival of M. tuberculosis was accompanied by necrotic cell death of infected neutrophils. Necrotic cell death entirely depended on radical oxygen species production since chronic granulomatous disease neutrophils were protected from M. tuberculosis‐triggered necrosis. More, importantly, the M.  tuberculosisΔRD1 mutant failed to induce neutrophil necrosis rendering this strain susceptible to radical oxygen species‐mediated killing. We conclude that this virulence function is instrumental for M. tuberculosis to escape killing by neutrophils and contributes to pathogenesis in tuberculosis.
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