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2017 ; 12
(7
): e0180143
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Boosting efferocytosis in alveolar space using BCG vaccine to protect host
against influenza pneumonia
#MMPMID28686604
Mukherjee S
; Subramaniam R
; Chen H
; Smith A
; Keshava S
; Shams H
PLoS One
2017[]; 12
(7
): e0180143
PMID28686604
show ga
Efferocytosis by alveolar phagocytes (APs) is pivotal in maintenance of lung
homeostasis. Increased efferocytosis by APs results in protection against lethal
acute lung injury due to pulmonary infections whereas defective efferocytosis by
APs results in chronic lung inflammation. In this report, we show that pulmonary
delivery of Bacillus Calmette-Guerin (BCG) significantly enhances efferocytosis
by APs. Increased efferocytosis by APs maintains lung homeostasis and protects
mice against lethal influenza pneumonia. Intranasally treated wild type C57Bl/6
(WT) mice with BCG showed significant increase in APs efferocytosis in vivo
compared to their PBS-treated counterparts. All BCG-treated WT mice survived
lethal influenza A virus (IAV) infection whereas all PBS-treated mice succumbed.
BCG-induced resistance was abrogated by depleting AP prior to IAV infection. BCG
treatment increased uptake, and digestion/removal of apoptotic cells by APs. BCG
significantly increased the expression of TIM4 on APs and increased expression of
Rab5 and Rab7. We demonstrated that increased efferocytosis by APs through
pulmonary delivery of BCG initiated rapid clearance of apoptotic cells from the
alveolar space, maintained lung homeostasis, reduced inflammation and protected
host against lethal IAV pneumonia.