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2015 ; 8
(9
): 10854-60
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Quercetin increases macrophage cholesterol efflux to inhibit foam cell formation
through activating PPAR?-ABCA1 pathway
#MMPMID26617799
Sun L
; Li E
; Wang F
; Wang T
; Qin Z
; Niu S
; Qiu C
Int J Clin Exp Pathol
2015[]; 8
(9
): 10854-60
PMID26617799
show ga
The accumulation of cholesterol in macrophages could induce the formation of foam
cells and increase the risk of developing atherosclerosis. We wonder if
quercetin, one of flavonoids with anti-inflammation functions in different cell
types, could elevate the development of foam cells formation in atherosclerosis.
We treated foam cells derived from oxLDL induced THP-1 cells with quercetin, and
evaluated the foam cells formation, cholesterol content and apoptosis of the
cells. We found that quercetin induced the expression of ABCA1 in differentiated
THP-1 cells, and increased the cholesterol efflux from THP-1 cell derived foam
cells. Eventually, cholesterol level and the formation of foam cell derived from
THP-1 cells decreased after quercetin treatment. In addition, quercetin activated
PPAR?-LXR? pathway to upregulate ABCA1 expression through increasing protein
level of PPAR? and its transcriptional activity. Inhibition of PPAR? activity by
siRNA knockdown or the addition of chemical inhibitor, GW9662, abolished
quercetin induced ABCA1 expression and cholesterol efflux in THP-1 derived
macrophages. Our data demonstrated that quercetin increased cholesterol efflux
from macrophages through upregulating the expressions of PPAR? and ABCA1. Taken
together, increasing uptake of quercetin or quercetin-rich foods would be an
effective way to lower the risk of atherosclerosis.