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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Immunology
2016 ; 149
(3
): 306-319
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High-density lipoprotein reduces inflammation from cholesterol crystals by
inhibiting inflammasome activation
#MMPMID27329564
Thacker SG
; Zarzour A
; Chen Y
; Alcicek MS
; Freeman LA
; Sviridov DO
; Demosky SJ Jr
; Remaley AT
Immunology
2016[Nov]; 149
(3
): 306-319
PMID27329564
show ga
Interleukin-1? (IL-1?), a potent pro-inflammatory cytokine, has been implicated
in many diseases, including atherosclerosis. Activation of IL-1? is controlled by
a multi-protein complex, the inflammasome. The exact initiating event in
atherosclerosis is unknown, but recent work has demonstrated that cholesterol
crystals (CC) may promote atherosclerosis development by activation of the
inflammasome. High-density lipoprotein (HDL) has consistently been shown to be
anti-atherogenic and to have anti-inflammatory effects, but its mechanism of
action is unclear. We demonstrate here that HDL is able to suppress IL-1?
secretion in response to cholesterol crystals in THP-1 cells and in
human-monocyte-derived macrophages. HDL is able to blunt inflammatory monocyte
cell recruitment in vivo following intraperitoneal CC injection in mice. HDL
appears to modulate inflammasome activation in several ways. It reduces the loss
of lysosomal membrane integrity following the phagocytosis of CC, but the major
mechanism for the suppression of inflammasome activation by HDL is decreased
expression of pro-IL-1? and NLRP3, and reducing caspase-1 activation. In summary,
we have described a novel anti-inflammatory effect of HDL, namely its ability to
suppress inflammasome activation by CC by modulating the expression of several
key components of the inflammasome.