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长链n-3多不饱和脂肪酸对肠上皮细胞促炎细胞因子基因mRNA表达的影响

DOI: 10.3969/j.issn.1006-267x.2012.07.025

Keywords: 长链n-3多不饱和脂肪酸,二十碳五烯酸,二十二碳六烯酸,IEC-6细胞,促炎细胞因子

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Abstract:

本试验旨在探讨长链n-3多不饱和脂肪酸(LCn-3PUFA)对肠上皮细胞促炎细胞因子基因mRNA表达的影响。试验选用大鼠肠上皮细胞系IEC-6细胞为模型,分为4个处理,分别为对照、脂多糖(LPS,1μg/mL)、LPS(1μg/mL)+二十二碳六烯酸(DHA,100μmol/L)和LPS(1μg/mL)+二十碳五烯酸(EPA,100μmol/L),每个处理3个重复,每孔为1个重复。细胞先用DHA、EPA或等量二甲基亚砜(DHA和EPA的溶剂,对照)预处理48h,再用LPS处理3h,收集细胞提取总RNA,采用实时定量PCR方法分析肿瘤坏死因子-α(TNF-α)、白介素-1β(IL-1β)和白介素-6(IL-6)的基因mRNA表达水平的差异。结果表明:LPS极显著上调了细胞中TNF-α、IL-1β和IL-6的基因mRNA表达水平(P<0.01),EPA均极显著或显著削弱了细胞内LPS诱导的TNF-α(P<0.01)、IL-1β(P<0.01)和IL-6的基因mRNA水平(P<0.05)的上调,而DHA仅显著削弱了细胞内LPS诱导的IL-1β的基因mRNA水平的上调(P<0.05)。结果提示,LCn-3PUFA在肠上皮细胞中具有抗炎作用,且在本试验条件下EPA的抗炎效果要优于DHA。

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