摘要
目的采用游离脂肪酸(FFA)和Fe^2+诱导肝细胞建立非酒精性脂肪肝病(NAFLD)模型,探讨FFA和Fe^2+在NAFLD发病过程中是否具有协同作用及其作用机制。方法设置对照组(细胞正常培养),0.250、0.500、1.000mmol/L油酸组,以及0.500mmol/L油酸+0.125mmol/L Fe^2+、0.500mmol/L油酸+0.250mmol/L Fe^2+、0.500mmol/L油酸+0.500mmol/L Fe^2+组,分别处理人肝癌HepG2细胞,采用油红O染色观察细胞脂质沉积,以磷酸甘油氧化酶法(GPO—PAP)测定细胞内TG的含量,采用RT—PCR法检测脂肪酸β-氧化的关键基因[脂酰CoA合成酶(ACSL-1)、肉碱棕榈酰基转移酶(CPT-1a)、脂肪酸合成酶(FAS)]的表达。分析不同组别TG含量,以及ACSL-1、CPT-1a、FAS mRNA相对值的差异。结果油红0染色结果显示,浓度为0.500mmol/L的油酸分别与不同浓度Fe^2+共同处理HepG2细胞后,随着Fe^2+浓度的增加,细胞内脂滴含量逐渐增多。对照组、0.250、0.500、1.000mmol/L油酸、0.500mmol/L油酸+0.125mmol/L Fe^2+、0.500mmol/L油酸+0.250mmol/L Fe^2+、0.500mmol/L油酸+0.500mmol/L Fe^2+组HepG2细胞中TG含量分别为(90.0±1.6)、(131.7±5.4)、(153.7±3.0)、(254.1±4.0)、(164.5±6.0)、(180.1±7.7)、(235.6±4.5)nmo]/mg(F=396.00,P〈0.05)。0.500mmol/L油酸、0.500mmol/L油酸+0.125mmol/L Fe^2+、0.500mmol/L油酸+0.250mmol/L Fe^2+、0.500mmol/L油酸+0.500mmol/L Fe^2+组HepG2细胞ACSL-1mRNA的表达水平分别为0.94±0.02、0.89±0.04、0.85±0.02、0.74±0.04(F=50.00,P〈0.05),CPT-1a mRNA分别为0.89±0.03、0.79±0.05、0.67±0.04、0.51±0.05(F=79.00,P〈0.05);FAS mRNA分别为1.31±0.05、1.44±0.03、1.51±0.05、1.56±0.06(F=79.70,P〈0.05)。结论用一定浓度的FFA和Fe^2+培养HepG2细胞,能够诱导NAFLD模型,二者可能通过影响脂肪酸的β-氧化共同参与NAFLD的发病过程。
Objective To establish nonalcoholic fatty liver disease (NAFLD) model induced by free fatty acid (FFA) and iron, and to explore the synergistic effect of FFA and Fe^2+ on the pathogenesis of NAFLD and mechanisms. Methods Human liver carcinoma cell HepG2 was respectively treated with 0. 250, 0. 500, 1. 000 mmol/L oleic acid, 0. 500 mmol/L oleic acid +0. 125 mmol/L Fe^2+ , O. 500 mmol/L oleic acid + 0. 250 mmol/L Fe^2+ , and 0. 500 mmol/L oleic acid + 0. 500 mmol/L Fe^2+ . Human liver carcinoma cell HepG2 was normally cultured in the control group. Lipid accumulation of cells were observed by oil red O staining and the determination of the triglyceride (TG) contents by GPO-PAP, then the expression of key genes involved in fatty acid β-oxidation ( fatty acyl CoA synthetase-1 ( ACSL-1 ) , carnitine acyl transferase 1 (CPT-1a), fatty acid synthetase (FAS)) was determined using RT-PCR. The differences of TG content and ACSL-1, CPT-1a, FAS, mRNA relative value were analyzed among different groups. Results The results of oil red O staining indicated that the eontents of lipid droplets were obviously elevated with the increase of Fe^2+ concentration in human liver carcinoma cell HepG2 treated with 0. 500 mmol/L oleic acid and different concentrations of Fe^2+ . The TG contents of HepG2 cell in control group, 0. 250, 0. 500, 1. 000 mmol/L oleie acid groups, 0. 500 mmol/L oleic acid +0. 125 mmol/L Fe^2+ group, 0. 500 mmol/L oleic acid + 0. 250 mmol/L Fe^2+ group, 0. 500 mmol/L oleic acid + 0. 500 mmol/L Fe^2+ group respectively were (90.0±1.6), (131.7 ±5.4), (153.7 ±3.0) , (254. 1 24.0), (164.5 ±6.0), (180. 1 ±7.7), (235.6±4.5) nmol/mg (F =396.00, P 〈0.05). The expression levels of ACSL-1 mRNA in 0. 500 mmol/L oleic acid group, 0. 500 mmol/L oleic acid +0. 125 mmol/L Fe^2+ group, 0. 500 mmol/L oleic acid + 0. 250 mmol/L Fe2 ± group, 0. 500 mmol/L oleic acid + 0. 500 mmol/L Fe^2 + group respectively were ( 0. 94 ± 0. 02 ), ( 0. 89 ±0. 04 ), ( 0. 85 ±0. 02 ), ( 0. 74 ±0. 04 ) ( F = 50. 00, P 〈 0. 05) ; the mRNA levels of CPT-1a were (0. 89 ±0. 03), (0. 79 ±0. 05), (0. 67±0. 04), (0. 51±0. 05) (F=79.00,P〈0.05); the mRNAlevels of FAS were (1.31±0.05),(1.44±0.03),(1.51 ±0.05), ( 1.56 ± 0. 06 ) ( F = 79. 70, P 〈 0. 05 ). Conclusion The NAFLD liver cell model could be established by oleic acid and Fe^2 + in HepG2 cells. FFA and iron might be involved in the pathogenesis of NAFLD through the intervention of fatty acid β-oxidation.
出处
《中华预防医学杂志》
CAS
CSCD
北大核心
2014年第10期904-908,共5页
Chinese Journal of Preventive Medicine
基金
国家自然科学基金(81273062)
关键词
油酸
脂肪肝
铁超负荷
脂肪酸类
Oleic acid
Fatty liver
Iron overload
Fatty acids