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All rights reserved. http://resource.belframework.org/belframework/20131211/knowledge/large_corpus.bel http://purl.org/dc/elements/1.1/title BEL Framework Large Corpus Document http://resource.belframework.org/belframework/20131211/knowledge/large_corpus.bel http://purl.org/pav/authoredBy http://www.tkuhn.ch/bel2nanopub/RATr5QbfxL8h4QPPS_hAWYWbJD4BNIZhU47A7NuCxl3B4#_5 http://resource.belframework.org/belframework/20131211/knowledge/large_corpus.bel http://purl.org/pav/version 20131211 http://www.tkuhn.ch/bel2nanopub/RATr5QbfxL8h4QPPS_hAWYWbJD4BNIZhU47A7NuCxl3B4#_4 http://www.w3.org/ns/prov#value Transcription of the gene encoding sterol regulatory element-binding protein 1c (SREBP-1c) is known to be activated by insulin in the liver. The resultant SREBP-1c protein activates transcription of the genes required for fatty acid synthesis. Here, we use SREBP-1c promoter reporter constructs to dissect the mechanism of insulin activation in freshly isolated rat hepatocytes. The data show that a complete insulin response (increase of 6- to 11-fold) requires two binding sites for liver X receptors (LXRs), which are nuclear receptors that are activated by oxygenated sterols. Disruption of these binding sites did not lower basal transcription but severely reduced the response to insulin. In contrast, disruption of the closely linked binding sites for SREBPs and nuclear factor Y lowered basal transcription drastically but still permitted a 4- to 7-fold increase in response to insulin. Arachidonic acid, an inhibitor of LXR activation, blocked the response to insulin. We conclude that insulin activates the SREBP-1c promoter primarily by increasing the activity of LXRs, possibly through production of a ligand that activates LXRs or their heterodimerizing partner, the retinoid X receptor. Nuclear SREBPs and nuclear factor Y play permissive roles. http://www.tkuhn.ch/bel2nanopub/RATr5QbfxL8h4QPPS_hAWYWbJD4BNIZhU47A7NuCxl3B4#_4 http://www.w3.org/ns/prov#wasQuotedFrom http://www.ncbi.nlm.nih.gov/pubmed/15266058 http://www.tkuhn.ch/bel2nanopub/RATr5QbfxL8h4QPPS_hAWYWbJD4BNIZhU47A7NuCxl3B4#_5 http://www.w3.org/2000/01/rdf-schema#label Selventa http://www.tkuhn.ch/bel2nanopub/RATr5QbfxL8h4QPPS_hAWYWbJD4BNIZhU47A7NuCxl3B4#assertion http://www.w3.org/ns/prov#hadPrimarySource http://www.ncbi.nlm.nih.gov/pubmed/15266058 http://www.tkuhn.ch/bel2nanopub/RATr5QbfxL8h4QPPS_hAWYWbJD4BNIZhU47A7NuCxl3B4#assertion http://www.w3.org/ns/prov#wasDerivedFrom http://resource.belframework.org/belframework/20131211/knowledge/large_corpus.bel http://www.tkuhn.ch/bel2nanopub/RATr5QbfxL8h4QPPS_hAWYWbJD4BNIZhU47A7NuCxl3B4#assertion http://www.w3.org/ns/prov#wasDerivedFrom http://www.tkuhn.ch/bel2nanopub/RATr5QbfxL8h4QPPS_hAWYWbJD4BNIZhU47A7NuCxl3B4#_4 http://www.tkuhn.ch/bel2nanopub/RATr5QbfxL8h4QPPS_hAWYWbJD4BNIZhU47A7NuCxl3B4#pubinfo http://www.tkuhn.ch/bel2nanopub/RATr5QbfxL8h4QPPS_hAWYWbJD4BNIZhU47A7NuCxl3B4 http://purl.org/dc/terms/created 2014-07-03T14:32:26.189+02:00 http://www.tkuhn.ch/bel2nanopub/RATr5QbfxL8h4QPPS_hAWYWbJD4BNIZhU47A7NuCxl3B4 http://purl.org/pav/createdBy http://orcid.org/0000-0001-6818-334X http://www.tkuhn.ch/bel2nanopub/RATr5QbfxL8h4QPPS_hAWYWbJD4BNIZhU47A7NuCxl3B4 http://purl.org/pav/createdBy http://orcid.org/0000-0002-1267-0234