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2018 ; 8
(1
): 6736
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High-density lipoprotein suppresses tumor necrosis factor alpha production by
mycobacteria-infected human macrophages
#MMPMID29712918
Inoue M
; Niki M
; Ozeki Y
; Nagi S
; Chadeka EA
; Yamaguchi T
; Osada-Oka M
; Ono K
; Oda T
; Mwende F
; Kaneko Y
; Matsumoto M
; Kaneko S
; Ichinose Y
; Njenga SM
; Hamano S
; Matsumoto S
Sci Rep
2018[Apr]; 8
(1
): 6736
PMID29712918
show ga
Immune responses to parasitic pathogens are affected by the host physiological
condition. High-density lipoprotein (HDL) and low-density lipoprotein (LDL) are
transporters of lipids between the liver and peripheral tissues, and modulate
pro-inflammatory immune responses. Pathogenic mycobacteria are parasitic
intracellular bacteria that can survive within macrophages for a long period.
Macrophage function is thus key for host defense against mycobacteria. These
basic facts suggest possible effects of HDL and LDL on mycobacterial diseases,
which have not been elucidated so far. In this study, we found that HDL and not
LDL enhanced mycobacterial infections in human macrophages. Nevertheless, we
observed that HDL remarkably suppressed production of tumor necrosis factor alpha
(TNF-?) upon mycobacterial infections. TNF-? is a critical host-protective
cytokine against mycobacterial diseases. We proved that toll-like receptor
(TLR)-2 is responsible for TNF-? production by human macrophages infected with
mycobacteria. Subsequent analysis showed that HDL downregulates TLR2 expression
and suppresses its intracellular signaling pathways. This report demonstrates for
the first time the substantial action of HDL in mycobacterial infections to human
macrophages.