Acute respiratory distress syndrome(ARDS)is one of the most fatal diseases worldwide.Pulmonary fibrosis occurs early in ARDS,and its severity plays a crucial role in ARDS mortality rate.Some studies suggested that fib...Acute respiratory distress syndrome(ARDS)is one of the most fatal diseases worldwide.Pulmonary fibrosis occurs early in ARDS,and its severity plays a crucial role in ARDS mortality rate.Some studies suggested that fibroproliferation is an essential mechanism in ARDS.Mitofusion2(Mfn2)overexpression plays a role in inhibiting cell proliferation.However,the role and potential mechanism of Mfn2 on the proliferation of fibroblasts is still unknown.In this study,we aimed at exploring the effect of Mfn2 on the human embryonic lung fibroblasts(HELF)and discussed its related mechanism.The HELF were treated with the Mfn2 overexpressing lentivirus(adv-Mfn2).The cell cycle was detected by flow cytometry.MTT,PCR and Western blotting were used to investigate the effect of Mfn2 on the proliferation of the HELF,collagen expression,the RAS-RAF-1-ERK1/2 pathway and the expression of cycle-related proteins(p21,p27,Rb,Raf-1,p-Raf-1,Erk1/2 and p-Erk1/2).The co-immunoprecipitation assay was used to explore the interaction between Mfn2 and Ras.The results showed that the overexpression of Mfn2 inhibited the proliferation of the HELF and induced the cell cycle arrest at the G0/G1 phase.Meanwhile,Mfn2 also inhibited the expression of collagen I,p-Erk and p-Raf-1.In addition,an interaction between Mfn2 and Ras existed in the HELF.This study suggests that the overexpression of Mfn2 can decrease the proliferation of HELF in ARDS,which was associated with the inhibition of the RAS-RAF-1-ERK1/2 pathway.The results may offer a potential therapeutic intervention for patients with ARDS.展开更多
目的观察rhIL-33对人胚肺成纤维细胞增殖及其间充质细胞标记物的影响,探讨IL-33/ST2L-TRAF信号通路在肺纤维化形成过程中的作用。方法培养HELF细胞,PCR检测IL-33受体ST2L m RNA;不同浓度梯度的rh IL-33刺激细胞,MTT法检测不同时间点（24...目的观察rhIL-33对人胚肺成纤维细胞增殖及其间充质细胞标记物的影响,探讨IL-33/ST2L-TRAF信号通路在肺纤维化形成过程中的作用。方法培养HELF细胞,PCR检测IL-33受体ST2L m RNA;不同浓度梯度的rh IL-33刺激细胞,MTT法检测不同时间点（24、48、72 h）IL-33对HF细胞增殖的影响;Real-time PCR方法检测IL-33刺激HELF后不同时间点（0、6、12、24、48、72 h）细胞标志性基因α-SMA m RNA、Vimentin m RNA、collagn I m RNA及TRAF-6 m RNA的变化;Western blot法检测细胞标志性蛋白α-平滑肌肌动蛋白（α-SMA）、波形蛋白（Vimentin）、I型胶原（collagen I）及关键性信号分子TRAF-6与下游信号分子ERK1/2、JNK、NF-kappa B等的改变。结果 IL-33能促进HELF的增殖,10 ng/ml的IL-33促增殖作用最强,且72 h最为明显;随着IL-33刺激细胞时间的逐渐延长,在0～72 h内α-SMA、Vimentin、collagen I在基因与蛋白水平均先上调后下调,信号分子TRAF-6、ERK1/2、JNK、NF-kappa B（P65）等亦呈现先上调后下调的趋势。结论 IL-33能促进HELF细胞增殖、活化及合成胶原,IL-33/ST2L-TRAF-6通路在此过程中起了关键作用,尤其是在病变早期炎症过程中作用最为明显。展开更多
基金This project was supported by Wuhan Medical Science Foundation of China(No.WX17B07,No.WX19A09,and No.WJ2019H324).
文摘Acute respiratory distress syndrome(ARDS)is one of the most fatal diseases worldwide.Pulmonary fibrosis occurs early in ARDS,and its severity plays a crucial role in ARDS mortality rate.Some studies suggested that fibroproliferation is an essential mechanism in ARDS.Mitofusion2(Mfn2)overexpression plays a role in inhibiting cell proliferation.However,the role and potential mechanism of Mfn2 on the proliferation of fibroblasts is still unknown.In this study,we aimed at exploring the effect of Mfn2 on the human embryonic lung fibroblasts(HELF)and discussed its related mechanism.The HELF were treated with the Mfn2 overexpressing lentivirus(adv-Mfn2).The cell cycle was detected by flow cytometry.MTT,PCR and Western blotting were used to investigate the effect of Mfn2 on the proliferation of the HELF,collagen expression,the RAS-RAF-1-ERK1/2 pathway and the expression of cycle-related proteins(p21,p27,Rb,Raf-1,p-Raf-1,Erk1/2 and p-Erk1/2).The co-immunoprecipitation assay was used to explore the interaction between Mfn2 and Ras.The results showed that the overexpression of Mfn2 inhibited the proliferation of the HELF and induced the cell cycle arrest at the G0/G1 phase.Meanwhile,Mfn2 also inhibited the expression of collagen I,p-Erk and p-Raf-1.In addition,an interaction between Mfn2 and Ras existed in the HELF.This study suggests that the overexpression of Mfn2 can decrease the proliferation of HELF in ARDS,which was associated with the inhibition of the RAS-RAF-1-ERK1/2 pathway.The results may offer a potential therapeutic intervention for patients with ARDS.
文摘目的观察rhIL-33对人胚肺成纤维细胞增殖及其间充质细胞标记物的影响,探讨IL-33/ST2L-TRAF信号通路在肺纤维化形成过程中的作用。方法培养HELF细胞,PCR检测IL-33受体ST2L m RNA;不同浓度梯度的rh IL-33刺激细胞,MTT法检测不同时间点（24、48、72 h）IL-33对HF细胞增殖的影响;Real-time PCR方法检测IL-33刺激HELF后不同时间点（0、6、12、24、48、72 h）细胞标志性基因α-SMA m RNA、Vimentin m RNA、collagn I m RNA及TRAF-6 m RNA的变化;Western blot法检测细胞标志性蛋白α-平滑肌肌动蛋白（α-SMA）、波形蛋白（Vimentin）、I型胶原（collagen I）及关键性信号分子TRAF-6与下游信号分子ERK1/2、JNK、NF-kappa B等的改变。结果 IL-33能促进HELF的增殖,10 ng/ml的IL-33促增殖作用最强,且72 h最为明显;随着IL-33刺激细胞时间的逐渐延长,在0～72 h内α-SMA、Vimentin、collagen I在基因与蛋白水平均先上调后下调,信号分子TRAF-6、ERK1/2、JNK、NF-kappa B（P65）等亦呈现先上调后下调的趋势。结论 IL-33能促进HELF细胞增殖、活化及合成胶原,IL-33/ST2L-TRAF-6通路在此过程中起了关键作用,尤其是在病变早期炎症过程中作用最为明显。
