[HTML][HTML] Peroxisome proliferator-activated receptor delta activation leads to increased transintestinal cholesterol efflux

CLJ Vrins, AE van der Velde, K van den Oever… - Journal of lipid …, 2009 - Elsevier
CLJ Vrins, AE van der Velde, K van den Oever, JHM Levels, S Huet, RPJO Elferink…
Journal of lipid research, 2009Elsevier
Peroxisome proliferator-activated receptor delta (PPARδ) is involved in regulation of energy
homeostasis. Activation of PPARδ markedly increases fecal neutral sterol secretion, the last
step in reverse cholesterol transport. This phenomenon can neither be explained by
increased hepatobiliary cholesterol secretion, nor by reduced cholesterol absorption. To test
the hypothesis that PPARδ activation leads to stimulation of transintestinal cholesterol efflux
(TICE), we quantified it by intestine perfusions in FVB mice treated with PPARδ agonist …
Peroxisome proliferator-activated receptor delta (PPARδ) is involved in regulation of energy homeostasis. Activation of PPARδ markedly increases fecal neutral sterol secretion, the last step in reverse cholesterol transport. This phenomenon can neither be explained by increased hepatobiliary cholesterol secretion, nor by reduced cholesterol absorption. To test the hypothesis that PPARδ activation leads to stimulation of transintestinal cholesterol efflux (TICE), we quantified it by intestine perfusions in FVB mice treated with PPARδ agonist GW610742. To exclude the effects on cholesterol absorption, mice were also treated with cholesterol absorption inhibitor ezetimibe or ezetimibe/GW610742. GW601742 treatment had little effect on plasma lipid levels but stimulated both fecal neutral sterol excretion (∼200%) and TICE (∼100%). GW610742 decreased intestinal Npc1l1 expression but had no effect on Abcg5/Abcg8. Interestingly, expression of Rab9 and LIMPII, encoding proteins involved in intracellular cholesterol trafficking, was increased upon PPARδ activation. Although treatment with ezetimibe alone had no effect on TICE, it reduced the effect of GW610742 on TICE. These data show that activation of PPARδ stimulates fecal cholesterol excretion in mice, primarily by the two-fold increase in TICE, indicating that this pathway provides an interesting target for the development of drugs aiming at the prevention of atherosclerosis.
Elsevier