GLI1介导的巨噬细胞极化调控缺氧性肺动脉高压的作用及机制

Mechanism of GLI1 mediated macrophages polarization in hypoxic pulmonary hypertension

目的:探讨神经胶质瘤相关癌基因家族锌指1(GLI1)对缺氧诱导大鼠肺泡巨噬细胞(NR8383)发生M1表型转化的作用机制及对肺动脉高压(PH)进展的影响。方法:将15只成年雄性Wistar大鼠随机分为对照组、缺氧PH模型组和缺氧PH加GANT61给药处理组,每组5只。小动物超声、右心导管实验检测大鼠PH相关指标,确定GLI1特异性抑制剂GANT61对PH进程的影响。HE染色检测肺动脉壁厚度。免疫组化检测α-SMA及M1型极化标志物TNF-α和IL-1β蛋白表达。免疫荧光检测M1型极化标志物CD86及TNF-α表达。Western blot检测GLI1及NF-κB蛋白表达。qRT-PCR检测M1型极化标志物iNOS、CD86、TNF-α、IL-1β及IL-12 mRNA表达。CHIP-PCR验证GLI1调控NF-κB启动子活性。ELISA检测IL-12含量。CCK-8检测大鼠肺动脉平滑肌细胞增殖。结果:GLI1抑制剂GANT61可缓解缺氧大鼠PH(P<0.05)。与缺氧组相比,抑制GLI1可降低大鼠肺组织TNF-α和IL-1β表达(P<0.05)。细胞实验中,缺氧通过上调GLI1激活NF-κB通路诱导NR8383 M1型极化,GLI1过表达促进M1型巨噬细胞相关标志物iNOS、CD86、TNF-α、IL-1β及IL-12表达(P<0.05)。NR8383培养上清可刺激肺动脉平滑肌细胞增殖(P<0.05),参与PH。结论:缺氧通过上调GLI1激活NF-κB通路诱导巨噬细胞发生M1型极化参与PH发生。

Objective:To explore effect of Glioma-associated oncogene family zinc finger 1(GLI1)on hypoxia induced transformation of NR8383 to M1 phenotype and development of pulmonary hypertension(PH).Methods:Fifteen adult male Wistar rats were randomly divided into control group,hypoxia PH model group and hypoxic PH with GANT61 treatment group,with 5 rats in each group.PH related indexes of rats were detected by small animal ultrasound and right cardiac catheter experiment to determine effect of GLI1 specific inhibitor GANT61 on progression of PH.Pulmonary arterial thickness was measured by HE staining.α-SMA and M1 polarization markers TNF-αand IL-1βexpressions were determined by immunohistochemistry.M1 polarization markers CD86 and TNF-αexpressions were determined by immunofluorescence.GLI1 expression and NF-κB protein were detected by Western blot.mRNA expressions of iNOS,CD86,TNF-α,IL-1βand IL-12 were detected by qRT-PCR.CHIP-PCR verified that GLI1 regulates NF-κB promoter activity.IL-12 content was detected by ELISA.Rat pulmonary artery smooth muscle cells proliferation was detected by CCK-8.Results:GLI1 inhibitor GANT61 could alleviate symptoms of PH in hypoxic rats(P<0.05).Compared with hypoxic group,inhibition of GLI1 reduced expressions of TNF-αand IL-1βin rat lung tissue(P<0.05).In cell experiments,hypoxia induced M1 polarization of NR8383 by up-regulating GLI1 to activate NF-κB pathway,GLI1 overexpression increased expressions of iNOS,CD86,TNF-α,IL-1βand IL-12 in M1 macrophages(P<0.05).NR8383 culture supernatants could stimulate pulmonary artery smooth muscle cell proliferation(P<0.05)and contribute to development of PH.Conclusion:Hypoxia activates NF-κB pathway by up-regulating GLI1 to induce M1 polarization of macrophages contributes to development of PH.