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J. Biol. Chem., Vol. 277, Issue 37, 34182-34190, September 13, 2002
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From the The oxysterol-activated liver X receptor (LXR)
provides a link between sterol and fatty acid metabolism; activation of
LXR induces transcription of lipogenic genes. This study shows that induction of the lipogenic genes Srebp-1c, Fas,
and Acc1 upon administration of the synthetic LXR agonist
T0901317 to C57BL/6J mice (10 mg/kg/day, 4 days) is associated with
massive hepatic steatosis along the entire liver lobule and a 2.5-fold
increase in very low density lipoprotein-triglyceride (VLDL-TG)
secretion. The increased VLDL-TG secretion was fully accounted for by
formation of larger (129 ± 9 nm versus 94 ± 12 nm, a 2.5-fold increase of particle volume) TG-rich particles.
Stimulation of VLDL-TG secretion did not lead to elevated plasma TG
levels in C57BL/6J mice, indicating efficient particle metabolism and
clearance. However, T0901317 treatment did lead to severe
hypertriglyceridemia in mouse models of defective TG-rich lipoprotein
clearance, i.e. APOE*3-Leiden transgenic mice (3.2-fold
increase) and apoE
Stimulation of Lipogenesis by Pharmacological Activation of the
Liver X Receptor Leads to Production of Large, Triglyceride-rich Very
Low Density Lipoprotein Particles*
§,
§,
,
,
,
,
,
,
, and

Laboratory of Pediatrics, Center for Liver,
Digestive and Metabolic Diseases, University Hospital Groningen, 9700 RB Groningen, the ¶ Gaubius Laboratory, TNO Prevention and
Health, 2301 CE Leiden, and the Departments of
Endocrinology and
Diabetes and ** Internal Medicine, Leiden University Medical
Center, 2300 RA Leiden, The Netherlands
/
LDLr
/
double knockouts (12-fold increase).
Incubation of rat hepatoma McA-RH7777 cells with T0901317 also resulted
in intracellular TG accumulation and enhanced TG secretion. We conclude
that, in addition to raising high density lipoprotein cholesterol
concentrations, pharmacological LXR activation in mice leads to
development of hepatic steatosis and secretion of atherogenic, large
TG-rich VLDL particles.
*
This work was supported by Grants 903-39-291 (to A. G.)
and 902-23-244 (to B. M. E.) from the Netherlands
Organization for Scientific Research.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.

To whom correspondence should be addressed: Laboratory of
Pediatrics, Center for Liver, Digestive and Metabolic Diseases, Rm.
Y2115, CMC IV, University Hospital Groningen, Hanzeplein 1, 9713 GZ
Groningen, The Netherlands. Tel.: 31-50-363-2669; Fax: 31-50-361-1746; E-mail: f.kuipers@med.rug.nl.
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