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2014 ; 184
(12
): 3170-5
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Bone marrow mesenchymal stem cells provide an antibiotic-protective niche for
persistent viable Mycobacterium tuberculosis that survive antibiotic treatment
#MMPMID25451154
Beamer G
; Major S
; Das B
; Campos-Neto A
Am J Pathol
2014[Dec]; 184
(12
): 3170-5
PMID25451154
show ga
During tuberculosis (TB), some Mycobacterium tuberculosis bacilli persist in the
presence of an active immunity and antibiotics that are used to treat the
disease. Herein, by using the Cornell model of TB persistence, we further
explored our recent finding that suggested that M. tuberculosis can escape
therapy by residing in the bone marrow (BM) mesenchymal stem cells. We initially
showed that M. tuberculosis rapidly disseminates to the mouse BM after aerosol
exposure and maintained a stable burden for at least 220 days. In contrast, in
the lungs, the M. tuberculosis burden peaked at 28 days and subsequently declined
approximately 10-fold. More important, treatment of the mice with the antibiotics
rifampicin and isoniazid, as expected, resulted in effective clearance of
M. tuberculosis from the lungs and spleen. In contrast, M. tuberculosis
persisted, albeit at low numbers, in the BM of antibiotic-treated mice. Moreover,
most viable M. tuberculosis was recovered from the bone marrow
CD271(+)CD45(-)-enriched cell fraction, and only few viable bacteria could be
isolated from the CD271(-)CD45(+) cell fraction. These results clearly show that
BM mesenchymal stem cells provide an antibiotic-protective niche for
M. tuberculosis and suggest that unraveling the mechanisms underlying this
phenomenon will enhance our understanding of M. tuberculosis persistence in
treated TB patients.