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Tamoxifen, (TMX) a widely used anti\u2010breast cancer drug, can induce NASH and changes in plasma cholesterol levels through mechanisms that are unclear. We studied primary actions of TMX using a short\u2010term treatment (5 days) that induces microvesicular hepatic steatosis and marked hypercholesterolemia in male rats. Using a combined approach of gene expression profiling and NMR\u2010based metabolite analysis, we found that TMX\u2010treated livers have increased saturated fatty acid content despite changes in gene expression, indicating decreased de novo lipogenesis and increased fatty acid oxidation. Our results show that TMX predominantly down\u2010regulates FAS expression and activity as indicated by the accumulation of malonyl\u2010CoA, a known inhibitor of mitochondrial \u03b2\u2010oxidation. In the face of a continued supply of exogenous free fatty acids, the blockade of fatty acid oxidation produced by elevated malonyl\u2010CoA is likely to be the major factor leading to steatosis. Use of a combination of metabolomic and transcriptomic analysis has allowed us to identify mechanisms underlying important metabolic side effects of a widely prescribed drug. Given the broader importance of hepatic steatosis, the novel molecular mechanism revealed in this study should be examined in other forms of steatosis and nonalcoholic steatohepatitis. Lelliott C. J., L\u00f3pez M., Curtis R. K., Parker N., Laudes M., Yeo G., Jimenez\u2010Linan M., Grosse J., Saha A. K., Wiggins D., Hauton D., Brand M. D. O'Rahilly S., Griffin J. L., Gibbons G. F., Vidal\u2010Puig A. Transcript and metabolite analysis of the effects of tamoxifen in rat liver reveals inhibition of fatty acid synthesis in the presence of hepatic steatosis. FASEB J. 19, 1\u201312 (2005)<\/jats:p>","DOI":"10.1096\/fj.04-3196com","type":"journal-article","created":{"date-parts":[[2005,6,28]],"date-time":"2005-06-28T16:43:23Z","timestamp":1119977003000},"page":"1108-1119","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":78,"title":["Transcript and metabolite analysis of the effects of tamoxifen in rat liver reveals inhibition of fatty acid synthesis in the presence of hepatic steatosis"],"prefix":"10.1096","volume":"19","author":[{"given":"Christopher J.","family":"Lelliott","sequence":"first","affiliation":[{"name":"Department of Clinical Biochemistry University of Cambridge Addenbrooke's Hospital  Cambridge UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miguel","family":"L\u00f3pez","sequence":"additional","affiliation":[{"name":"Department of Clinical Biochemistry University of Cambridge Addenbrooke's Hospital  Cambridge UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R. 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