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Institute for Nutrition Research (L.K.J., S.M.A., K.T.D., K.A.R.T., K.H., F.H., S.M.U., H.I.N.), University of Oslo, N-0316 Oslo, Norway; Molecular Biology (S.J., K.B.), Research Area Cardiovascular & Gastrointestinal, AstraZeneca Mölndal, S-431 83 Mölndal, Sweden; and Department of Bioscience and Medical Nutrition (G.U.S., J.-Å.G.), Novum, S-141 86 Huddinge, Sweden
Address all correspondence and requests for reprints to: Hilde Irene Nebb, Institute for Nutrition Research, University of Oslo, P.O. Box 1046 Blindern, N-0316 Oslo, Norway. E-mail: h.i.nebb{at}basalmed.uio.no.
The pivotal role of liver X receptors (LXRs) in the metabolic conversion of cholesterol to bile acids in mice is well established. More recently, the LXR
promoter has been shown to be under tight regulation by peroxisome proliferator-activated receptors (PPARs), implying a role for LXR in mediating the interplay between cholesterol and fatty acid metabolism. We have studied the role of LXR in fat cells and demonstrate that LXR is regulated during adipogenesis and augments fat accumulation in mature adipocytes. LXR expression in murine 3T3-L1 adipocytes as well as in human adipocytes was up-regulated in response to PPAR
agonists. Administration of a PPAR agonist to obese Zucker rats also led to increased LXR mRNA expression in adipose tissue in vivo. LXR agonist treatment of differentiating adipocytes led to increased lipid accumulation. An increase of the expression of the LXR target genes, sterol regulatory binding protein-1 and fatty acid synthase, was observed both in vivo and in vitro after treatment with LXR agonists for 24 h. Finally, we demonstrate that fat depots in LXR/ß-deficient mice are smaller than in age-matched wild-type littermates. These findings imply a role for LXR in controlling lipid storage capacity in mature adipocytes and point to an intriguing physiological interplay between LXR and PPAR in controlling pathways in lipid handling.
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