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2017 ; 216
(3
): 583-594
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Mycobacterium tuberculosis replicates within necrotic human macrophages
#MMPMID28242744
Lerner TR
; Borel S
; Greenwood DJ
; Repnik U
; Russell MR
; Herbst S
; Jones ML
; Collinson LM
; Griffiths G
; Gutierrez MG
J Cell Biol
2017[Mar]; 216
(3
): 583-594
PMID28242744
show ga
Mycobacterium tuberculosis modulation of macrophage cell death is a
well-documented phenomenon, but its role during bacterial replication is less
characterized. In this study, we investigate the impact of plasma membrane (PM)
integrity on bacterial replication in different functional populations of human
primary macrophages. We discovered that IFN-? enhanced bacterial replication in
macrophage colony-stimulating factor-differentiated macrophages more than in
granulocyte-macrophage colony-stimulating factor-differentiated macrophages. We
show that permissiveness in the different populations of macrophages to bacterial
growth is the result of a differential ability to preserve PM integrity. By
combining live-cell imaging, correlative light electron microscopy, and
single-cell analysis, we found that after infection, a population of macrophages
became necrotic, providing a niche for M. tuberculosis replication before
escaping into the extracellular milieu. Thus, in addition to bacterial
dissemination, necrotic cells provide first a niche for bacterial replication.
Our results are relevant to understanding the environment of M. tuberculosis
replication in the host.