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2017 ; 8
(ä): 307
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Mycobacterium tuberculosis Cell Wall Fragments Released upon Bacterial Contact
with the Human Lung Mucosa Alter the Neutrophil Response to Infection
#MMPMID28373877
Scordo JM
; Arcos J
; Kelley HV
; Diangelo L
; Sasindran SJ
; Youngmin E
; Wewers MD
; Wang SH
; Balada-Llasat JM
; Torrelles JB
Front Immunol
2017[]; 8
(ä): 307
PMID28373877
show ga
In 2016, the World Health Organization reported that one person dies of
tuberculosis (TB) every 21?s. A host environment that Mycobacterium tuberculosis
(M.tb) finds during its route of infection is the lung mucosa bathing the
alveolar space located in the deepest regions of the lungs. We published that
human lung mucosa, or alveolar lining fluid (ALF), contains an array of
hydrolytic enzymes that can significantly alter the M.tb surface during infection
by cleaving off parts of its cell wall. This interaction results in two different
outcomes: modifications on the M.tb cell wall surface and release of M.tb cell
wall fragments into the environment. Typically, one of the first host immune
cells at the site of M.tb infection is the neutrophil. Neutrophils can mount an
extracellular and intracellular innate immune response to M.tb during infection.
We hypothesized that exposure of neutrophils to ALF-induced M.tb released cell
wall fragments would prime neutrophils to control M.tb infection better. Our
results show that ALF fragments activate neutrophils leading to an increased
production of inflammatory cytokines and oxidative radicals. However, neutrophil
exposure to these fragments reduces production of chemoattractants (i.e.,
interleukin-8), and degranulation, with the subsequent reduction of
myeloperoxidase release, and does not induce cytotoxicity. Unexpectedly, these
ALF fragment-derived modulations in neutrophil activity do not further, either
positively or negatively, contribute to the intracellular control of M.tb growth
during infection. However, secreted products from neutrophils primed with ALF
fragments are capable of regulating the activity of resting macrophages. These
results indicate that ALF-induced M.tb fragments could further contribute to the
control of M.tb growth and local killing by resident neutrophils by switching on
the total oxidative response and limiting migration of neutrophils to the
infection site.