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2017 ; 11
(ä): 617-627
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?(3)-Adrenoceptor activation upregulates apolipoprotein A-I expression in HepG2
cells, which might further promote cholesterol efflux from macrophage foam cells
#MMPMID28424539
Gao XQ
; Li YF
; Jiang ZL
Drug Des Devel Ther
2017[]; 11
(ä): 617-627
PMID28424539
show ga
OBJECTIVE: The aim of this study was to explore the effects of ?(3)-adrenoceptor
(?(3)-AR) activation on HepG2 cells and its influence on cholesterol efflux from
macrophage foam cells. MATERIALS AND METHODS: HepG2 cells were cultured and
treated with the ?(3)-AR agonist, BRL37344, and antagonist, SR52390A, and the
expression of apolipoprotein (Apo) A-I, ApoA-II, ApoB, and ?(3)-AR in the
supernatants and cells was determined. The expression of peroxisome
proliferator-activated receptor (PPAR) ? and PPAR? in the HepG2 cells was also
assessed. Next, using the RAW264.7 macrophage foam cell model, we also assessed
the influence of the HepG2 cell supernatants on lipid efflux. The cholesterol
content of the foam cells was also measured, and the cholesterol efflux from the
macrophages was examined by determining (3)H-labeled cholesterol levels.
Expression of ATP-binding cassette transporter (ABC) A1 and ABCG1 of the
macrophage foam cells was also assessed. RESULTS: ?(3)-AR activation increased
ApoA-I expression in both the HepG2 cells and the supernatants; PPAR? expression
was upregulated, but PPAR? expression was not. Treatment with GW9662 abolished
the increased expression of ApoA-I induced by the ?(3)-AR agonist. The HepG2 cell
supernatants decreased the lipid accumulation and increased the cholesterol
efflux from the macrophage foam cells. ABCA1 expression, but not ABCG1
expression, increased in the macrophage foam cells treated with BRL37344-treated
HepG2 cell supernatants. CONCLUSION: Activation of ?(3)-AR in HepG2 cells
upregulates ApoA-I expression, which might further promote cholesterol efflux
from macrophage foam cells. PPAR? might be required for the induction of ApoA-I
expression.