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2015 ; 56
(11
): 2070-84
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Xanthine-based KMUP-1 improves HDL via PPAR?/SR-B1, LDL via LDLRs, and HSL via
PKA/PKG for hepatic fat loss
#MMPMID26351364
Kuo KK
; Wu BN
; Liu CP
; Yang TY
; Kao LP
; Wu JR
; Lai WT
; Chen IJ
J Lipid Res
2015[Nov]; 56
(11
): 2070-84
PMID26351364
show ga
The phosphodiesterase inhibitor (PDEI)/eNOS enhancer KMUP-1, targeting G-protein
coupled receptors (GPCRs), improves dyslipidemia. We compared its lipid-lowering
effects with simvastatin and explored hormone-sensitive lipase (HSL)
translocation in hepatic fat loss. KMUP-1 HCl (1, 2.5, and 5 mg/kg/day) and
simvastatin (5 mg/kg/day) were administered in C57BL/6J male mice fed a high-fat
diet (HFD) by gavage for 8 weeks. KMUP-1 inhibited HFD-induced plasma/liver TG,
total cholesterol, and LDL; increased HDL/3-hydroxy-3-methylglutaryl-CoA
reductase (HMGR)/Rho kinase II (ROCK II)/PPAR?/ABCA1; and decreased liver and
body weight. KMUP-1 HCl in drinking water (2.5 mg/200 ml tap water) for 1-14 or
8-14 weeks decreased HFD-induced liver and body weight and scavenger receptor
class B type I expression and increased protein kinase A (PKA)/PKG/LDLRs/HSL
expression and immunoreactivity. In HepG2 cells incubated with serum or exogenous
mevalonate, KMUP-1 (10(-7)?10(-5) M) reversed HMGR expression by feedback
regulation, colocalized expression of ABCA1/apolipoprotein A-I/LXR?/PPAR?, and
reduced exogenous geranylgeranyl pyrophosphate/farnesyl pyrophosphate
(FPP)-induced RhoA/ROCK II expression. A guanosine 3',5'-cyclic monophosphate
(cGMP) antagonist reversed KMUP-1-induced ROCK II reduction, indicating cGMP/eNOS
involvement. KMUP-1 inceased PKG and LDLRs surrounded by LDL and restored
oxidized LDL-induced PKA expresion. Unlike simvastatin, KMUP-1 could not inhibit
(14)C mevalonate formation. KMUP-1 could, but simvastatin could not, decrease
ROCK II expression by exogenous FPP/CGPP. KMUP-1 improves HDL via
PPAR?/LXR?/ABCA1/Apo-I expression and increases LDLRs/PKA/PKG/HSL expression and
immunoreactivity, leading to TG hydrolysis to lower hepatic fat and body weight.