摘要
目的明确棕榈酸对载脂蛋白M(apolipoproteinM,ApoM)表达的影响及其机制。方法用不同浓度棕榈酸处理人肝癌细胞株(HepG2细胞),采用实时定量PCR及PCR芯片分析棕榈酸对ApoM表达的影响和可能的机制。分别用棕榈酸(1mmol/L)和(或)PI-3K抑制剂LY294002(LY,10μmol/L)、蛋白激酶C抑制剂GFl09203X(GFX,2μmol/L)以及PPARβ/δ的拮抗剂GSK3787(10μmoL/L)处理HepG2细胞,实时定量PCR检测ApoM相关基因表达水平。结果0、0.25、0.5及1mmol/L棕榈酸分别作用于HepG2细胞后,ApoMmRNA表达水平显著下降,且呈剂量依赖性(P〈0.01)。人胰岛素信号通路PCR芯片检测结果显示,棕榈酸通过其中的6条信号途径影响HepG2细胞的增殖。LY对HepG2细胞ApoMmRNA表达的影响差异无统计学意义(P〉0.05),且LY不能逆转棕榈酸下调HepG2细胞ApoMmRNA的表达。GFX明显降低ApoMmRNA的表达水平(P〈0.05),但GFX不影响棕榈酸降低ApoMmRNA的效应。1mmol/L棕榈酸显著升高HepG2细胞PPARp/8mRNA水平(P〈O.001);PPARB/8拮抗剂GSK3787对ApoMmRNA表达的影响无统计学意义(P〉0.05);但其能够显著抑制棕榈酸降低HepG2细胞ApoM mRNA的效应(P〈0.05)。结论棕榈酸通过PPARβ/δ途径下调HepG2细胞ApoM基因表达,详细机制还需进一步研究。
Objective To examine whether palmitic acid downregulates ApoM expression and further to investigate its mechanism. Methods Human hepatoma cell line, HepG2 cells were treated with the media containing palmitic acid( 1 mmol/L) and/or PI-3K inhibitor LY294002 ( 10 μmol/L) , protein kinase C inhibitor GF109203X (GFX, 2 μmol/L) and/or PPARβ/δ antagonist GSK3787 ( 10 μmol/L) , respectively. Real-time PCR and PCR array were applied to analyze the effect of palmitic acid on ApoM expression levels and some other genes in relation for regulation of ApoM expression. Results When the cells were treated with 1 mmol/L palmitic acid, ApoM mRNA levels were significantly decreased compared to the control group (P〈0.01). The human insulin signaling pathway PCR array analysis showed that palmitie acid affected HepG2 cells growth via six pathways. LY294002 had no effect on ApoM expression (P 〉 0. 05 ), which could not reverse palmitic acid-induced down-regulation of ApoM expression. Whereas GFX could significantly decrease ApoM mRNA levels ( P 〈 0.05 ) , and thus did not reverse palmitic acid-induced down-regulation of ApoM expression. In HepG2 cells, PPARβ/δ antagonist GSK3787 had no effect on ApoM expression ( P 〉 0. 05 ) , however, it reversed palmitic acid-induced down-regulation of ApoM expression ( P〈0.05 ). Condusion ApoM expression is down-regulated by palmitic acid via the PPARβ/δpathway in HeoG2 cells.
出处
《中华内分泌代谢杂志》
CAS
CSCD
北大核心
2014年第3期233-237,共5页
Chinese Journal of Endocrinology and Metabolism
基金
国家自然科学基金资助项目(81071414)
江苏省自然科学基金资助项目(BK2011245)
常州市科技计划项目(CJ20122012)