Tangier disease is caused by mutations in ATP binding cassette transporter A1( ABCA1). ABCA1 interacts with lipid-free apolip oproteins, promoting phospholipid and cholesterol efflux from cells and giving r ise to HDL...Tangier disease is caused by mutations in ATP binding cassette transporter A1( ABCA1). ABCA1 interacts with lipid-free apolip oproteins, promoting phospholipid and cholesterol efflux from cells and giving r ise to HDL particles. ABCA1 may act as a phospholipid translocase facilitating p hospholipid binding to apoA-I. ABCA1 gene expression is upregulated in cholester ol-loaded cells as a result of activation of LXR/RXR-mediated gene transcription . LXR and RXR coordinately induce a battery of genes mediating cellular choleste rol efflux, centripetal cholesterol transport, and cholesterol excretion in bile . Small-molecule activators of LXR/RXR or other stimulators of macrophage or int estinal cholesterol efflux hold great promise as future treatments for atheroscl erosis.展开更多
目的:研究微小RNA(microRNA,miR)-218-5p靶向调控三磷酸腺苷结合盒超家族G家族第2个成员(ATP-binding cassette sub-family G member 2,ABCG2)基因对Tca-8113细胞的增殖、迁移和侵袭的影响,并探讨其机制。方法:运用实时荧光定量聚合酶...目的:研究微小RNA(microRNA,miR)-218-5p靶向调控三磷酸腺苷结合盒超家族G家族第2个成员(ATP-binding cassette sub-family G member 2,ABCG2)基因对Tca-8113细胞的增殖、迁移和侵袭的影响,并探讨其机制。方法:运用实时荧光定量聚合酶链反应(quantitative Real-time PCR,qRT-PCR)与Western blot检测Tca-8113细胞和NOK细胞中miR-218-5p和ABCG2的表达。通过双荧光素酶报告基因实验检测miR-218-5p和ABCG2靶向关系。用脂质体法将miR-218-5p mimic、ABCG2小干扰RNA(interfering RNA,siRNA)、miR-218-5p mimic+pcDNA-ABCG2分别转染至Tca-8113细胞中,噻唑蓝(methyl thiazol tetrazolium,MTT)法、Transwell法检测Tca-8113细胞的增殖、迁移和侵袭。结果:与NOK细胞比较,Tca-8113细胞miR-218-5p呈显著低表达,ABCG2呈显著高表达(P<0.05)。过表达miR-218-5p、抑制ABCG2均可抑制Tca-8113细胞的增殖和迁移(P<0.05)。双荧光素酶报告基因实验证实miR-218-5p与ABCG2的靶向结合关系。过表达ABCG2可逆转上调miR-218-5p对Tca-8113细胞增殖、迁移和侵袭的抑制作用。结论:上调miR-218-5p的表达可靶向调控ABCG2,抑制Tca-8113细胞的增殖、迁移和侵袭,将可为口腔鳞状细胞癌的治疗提供新的靶点。展开更多
文摘Tangier disease is caused by mutations in ATP binding cassette transporter A1( ABCA1). ABCA1 interacts with lipid-free apolip oproteins, promoting phospholipid and cholesterol efflux from cells and giving r ise to HDL particles. ABCA1 may act as a phospholipid translocase facilitating p hospholipid binding to apoA-I. ABCA1 gene expression is upregulated in cholester ol-loaded cells as a result of activation of LXR/RXR-mediated gene transcription . LXR and RXR coordinately induce a battery of genes mediating cellular choleste rol efflux, centripetal cholesterol transport, and cholesterol excretion in bile . Small-molecule activators of LXR/RXR or other stimulators of macrophage or int estinal cholesterol efflux hold great promise as future treatments for atheroscl erosis.
