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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, METHODS, RESULTS. Meshes: ATP Binding Cassette Transporter 1, ATP Binding Cassette Transporter, Subfamily G, Member 1, ATP-Binding Cassette Transporters, Animals, Biological Transport, Blotting, Western, Cells, Cultured, Cholesterol, DNA-Binding Proteins, Gene Expression, Glomerular Mesangium, Hydrocarbons, Fluorinated, Lipoproteins, Liver X Receptors, Luciferases, Mice, Orphan Nuclear Receptors, Receptors, Cytoplasmic and Nuclear, Reverse Transcriptase Polymerase Chain Reaction, Sulfonamides.
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Do [ Liver X receptors mediate cholesterol efflux in mouse glomerular mesangial cells ]? Context: To examine the role of liver X receptors (LXRs) in lipid metabolism in cultured mouse mesangial cells. To determine whether LXRalpha and LXRbeta are expressed in the kidney, RT-PCR and western blot assay were utilized. Cultured mesangial cells were treated with either vehicle or LXR agonist TO901317(10 micromol/L) for 24 hours. Real-time PCR analysis was used to detect ABCA1 and ABCG1 expressions. Cells were also transfected with a human ABCA1 promoter driven luciferase reporter plasmid and then stimulated with or without TO901317 for 24 hours. In order to determine the effect of TO901317 on protein expression of ABCA1, LXRalpha adenovirus was used to overexpress LXRalpha in the cultured cells. Finally, [3H] cholesterol efflux assay was performed to evaluate the efflux of cholesterol upon TO901317 stimulation. Both LXRalpha and LXRbeta were expressed in the kidney, freshly isolated glomeruli and mesangial cells. After treatment with TO901317, both ABCA1 and ABCG1 expressions were induced. Moreover, ABCA1 protein level was increased after the cells were simultaneously treated with LXRalpha-adenovirus and TO901317. The cholesterol efflux was also significantly enhanced after TO901317 treatment.
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LXRalpha and LXRbeta were functionally expressed in mouse mesangial cells. Activation of LXRs enhanced cholesterol efflux possibly through upregulating ABCA1 and ABCG1 expressions in mesangial cells. Therefore, LXR agonist might ameliorate lipid accumulation and reduce related cell injury in mesangial cells. Final Decision: yes