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Although de novo lipid synthesis inhibitors are highly effective in lowering total and LDL-cholesterol they have only modest effects on raising HDL-C. A better understanding of the mechanism of ethanol-mediated HDL-C regulation could suggest new therapeutic approaches for CVD.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Methods<\/jats:title>\n<jats:p>Human hepatoblastoma (HepG2) and colorectal epithelial adenocarcinoma (Caco-2) cells were incubated in the presence of varying concentrations of ethanol in the culture medium, with or without addition of de novo lipid synthesis (DNLS) inhibitors (atorvastatin and\/or TOFA). ApoA1 protein was measured by Western blot, and RNA of lipid pathway genes <jats:italic>APOA1<\/jats:italic>, <jats:italic>APOC3<\/jats:italic>, <jats:italic>APOA4<\/jats:italic>, <jats:italic>APOB100<\/jats:italic>, <jats:italic>HMGCR<\/jats:italic>, <jats:italic>LDLR<\/jats:italic>, and <jats:italic>SREBF2<\/jats:italic> by quantitative RT-PCR. Lipoproteins (VLDL, LDL, and HDL) and lipids were also monitored.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Results<\/jats:title>\n<jats:p>Ethanol stimulated ApoA1 protein (both cytoplasmic and secreted) and <jats:italic>APOA1<\/jats:italic> RNA levels in HepG2 cells in a dose sensitive way, with ~\u200950% upregulation at 100\u2009mM ethanol in the medium. The effect was not observed in intestinal-derived Caco-2 cells. DNLS inhibitors did not block the upregulation of ApoA1 RNA by ethanol; TOFA alone produced a modest increase in ApoA1 RNA. Ethanol had no effect on ABCA1 protein levels. Addition of ethanol to the cell medium led to modest increases in de novo synthesis of total cholesterol, cholesteryl esters and triglycerides, and as expected these increases were blocked when the lipid synthesis inhibitors were added. Ethanol stimulated a small increase in HDL and VLDL but not LDL synthesis. Ethanol in the cell medium also induced modest but measurable increases in the RNA of <jats:italic>APOC3<\/jats:italic>, <jats:italic>APOA4<\/jats:italic>, <jats:italic>APOB<\/jats:italic>, <jats:italic>LDLR<\/jats:italic>, and <jats:italic>HMGCR<\/jats:italic> genes. Unlike <jats:italic>APOA1<\/jats:italic>, induction of RNA from <jats:italic>APOC3<\/jats:italic> and <jats:italic>APOA4<\/jats:italic> was also observed in Caco-2 cells as well as HepG2 cells.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Conclusion<\/jats:title>\n<jats:p>This study has verified the previously reported upregulation of <jats:italic>APOA1<\/jats:italic> by exposure of HepG2, but not Caco-2 cells, to ethanol in the culture medium. It is shown for the first time that the effect is dependent on RNA polymerase II-mediated transcription, but not on de novo biosynthesis of cholesterol or fatty acids, and therefore is not a generalized metabolic response to ethanol exposure. Some other lipid pathway genes are also modulated by ethanol exposure of cells. The results reported here suggest that the proximal signaling molecule leading to increased <jats:italic>APOA1<\/jats:italic> gene expression in response to ethanol exposure may be free acetate or acetyl-CoA.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Take home<\/jats:title>\n<jats:p>Upregulation of ApoA1 gene expression in hepatoma cells in culture, upon exposure to moderate ethanol concentrations in the medium, occurs at the level of RNA and is not dependent on new cholesterol or fatty acid synthesis. The primary signaling molecule may be free acetate or acetyl-CoA. These results are important for understanding the mechanism by which moderate alcohol consumption leads to upregulation of serum HDL-cholesterol in humans, and suggests new approaches to targeting HDL as a risk factor for cardiovascular disease.<\/jats:p>\n<\/jats:sec>","DOI":"10.1186\/s12944-020-01309-4","type":"journal-article","created":{"date-parts":[[2020,6,20]],"date-time":"2020-06-20T13:02:17Z","timestamp":1592658137000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Ethanol-mediated upregulation of APOA1 gene expression in HepG2 cells is independent of de novo lipid biosynthesis"],"prefix":"10.1186","volume":"19","author":[{"given":"Youcef","family":"Khodja","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9936-5741","authenticated-orcid":false,"given":"Mark E.","family":"Samuels","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,6,20]]},"reference":[{"key":"1309_CR1","doi-asserted-by":"crossref","unstructured":"Joseph P, Leong D, McKee M, Anand SS, Schwalm JD, Teo K, et al. 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