核转录因子-κB在辛伐他汀抑制大鼠肺动脉平滑肌细胞增殖中的作用

Effect of NF-κB on proliferation of rat pulmonary artery smooth muscle cells inhibited by simvastatin

目的探讨核转录因子-κB(NF-κB)在辛伐他汀抑制大鼠肺动脉平滑肌细胞(PASMC)增殖中的作用。方法随机将体外培养的大鼠PASMC分为对照组、血小板源性生长因子(PDGF)刺激组、辛伐他汀干预组和辛伐他汀联合小白菊内酯(NF-κB抑制剂)干预组,每组6个样本。通过MTT比色法和流式细胞术检测PASMC的增殖及细胞周期;通过免疫组织化学检测NF-κB蛋白的表达并进行图像分析;通过RealTime PCR检测NF-κB m RNA的表达水平。结果 PDGF刺激组的各时间点MTT值,S期和G2+M期细胞比例,NF-κB蛋白及mRNA表达水平均较对照组显著升高(均P<0.05);给予辛伐他汀干预后,上述各指标水平均较PDGF刺激组降低(均P<0.05);辛伐他丁联合小白菊内酯干预后上述各指标下降更加明显,但与辛伐他汀干预组比较差异均无统计学意义(均P>0.05)。结论辛伐他汀能抑制PASMC的增殖和细胞周期进程;NF-κB可能在辛伐他汀对PASMC增殖的抑制中起重要作用。

Objective To explore the effects of NF-κB on proliferation of rat pulmonary artery smooth muscle cells（PASMC） inhibited by simvastatin. Methods PASMC isolated from rats and cultured in vitro were randomly divided into four groups（n=6 each）： control, platelet-derived growth factor（PDGF） treatment, PDGF＋simvastatin treatment, and PDGF＋simvastatin＋parthenolide（NF-κB inhibitor） treatment. MTT colorimetric assay and flow cytometry were performed to detect cell proliferation and cell cycle distribution. Immunohistochemistry was performed to detect the expression of NF-κB protein. Real-Time PCR was performed to detect NF-κB mRNA expression. Results Compared with the control group, MTT values of PASMC at all time points, cell proportion at the S phase and G2＋M phase, NF-κB protein and m RNA expression increased significantly in the PDGF group（P〈0.05）. With the intervention of simvastatin, the levels of above indexes decreased compared with the PDGF group（P〈0.05）. With the intervention of simvastatin and parthenolide, the levels of above indexes decreased more obviously, but were not significantly different from those in the simvastatin intervention group. Conclusions Simvastatin can inhibit proliferation of PASMC and cell cycle process. NF-κB may play an important role in the inhibitory effect of simvastatin on the proliferation of PASMC.