PSRC1过表达对巨噬细胞泡沫化形成的影响及其机制

摘要

目的 观察PSRC1过表达对氧化型低密度脂蛋白(ox-LDL)诱导的RAW264.7巨噬细胞泡沫化形成的影响及机制.方法:构建PSRC1基因的重组腺病毒载体(Ad-PSRC1)和阴性对照(Ad-GFP),并转染、培养RAW264.7巨噬细胞,研究分为Ad-GFP组和Ad-PSRC1组.利用100μg/mL的ox-LDL干预细胞48 h后,油红O染色检测两组细胞中胆固醇酯含量;Western blot检测LDL摄取相关受体清道夫受体-AⅠ(SR-AⅠ)和低密度脂蛋白受体(LDLR)的表达;ELISA检测炎症因子白介素-6(IL-6)和肿瘤坏死因子-α(TNF-α)的表达.结果 腺病毒转染成功,Ad-PSRC1组细胞中PSRC1的蛋白水平均明显增加(P<0.05);与Ad-GFP对照组相比,Ad-PSRC1组细胞中胆固醇酯的含量明显降低(P<0.05);SR-AⅠ、LDLR的蛋白表达水平明显降低(P<0.05);细胞上清液中IL-6、TNF-α的分泌水平也明显降低(P<0.05).结论 PSRC1过表达能够有效地抑制泡沫细胞的形成,其机制可能与减少低密度脂蛋白相关受体以及炎症因子的表达有关.%Objective To investigate the effect and potential mechanism of PSRC1 overexpression on foam cell formation of oxidized low-density lipoprotein(ox-LDL)-induced RAW264.7. Method After 48-h treat-ment of 100 μg/ml ox-LDL,changes of the accumulation of cholesterol esters in two groups was detected by oil red O staining.The protein expression of SR-AⅠand LDLR was detected by Western blot assay.Besides,ELISA was used to detect levels of IL-6 and TNF-α.Result The accumulation of cholesterol esters was lower in Ad-PSRC1 group than that in Ad-GFP group(P<0.05). The protein expression of SR-AⅠand LDLR was decreased signifi-cantly(P<0.05),and levels of the secreted IL-6 and TNF-α were also significantly decreased(P<0.05).Con-clusion Our data indicates that PSRC1 overexpression suppresses the formation of foam cells through improving lipid metabolism and down-regulating inflammatory cytokine IL-6 and TNF-α in macrophages.