Objective Our previous studies established that microRNA(miR)-451 from human umbilical cord mesenchymal stem cell-derived exosomes(hUC-MSC-Exos)alleviates acute lung injury(ALI).This study aims to elucidate the mechan...Objective Our previous studies established that microRNA(miR)-451 from human umbilical cord mesenchymal stem cell-derived exosomes(hUC-MSC-Exos)alleviates acute lung injury(ALI).This study aims to elucidate the mechanisms by which miR-451 in hUC-MSC-Exos reduces ALI by modulating macrophage autophagy.Methods Exosomes were isolated from hUC-MSCs.Severe burn-induced ALI rat models were treated with hUC-MSC-Exos carrying the miR-451 inhibitor.Hematoxylin-eosin staining evaluated inflammatory injury.Enzyme-linked immunosorbnent assay measured lipopolysaccharide(LPS),tumor necrosis factor-α,and interleukin-1βlevels.qRT-PCR detected miR-451 and tuberous sclerosis complex 1(TSC1)expressions.The regulatory role of miR-451 on TSC1 was determined using a dual-luciferase reporter system.Western blotting determined TSC1 and proteins related to the mammalian target of rapamycin(mTOR)pathway and autophagy.Immunofluorescence analysis was conducted to examine exosomes phagocytosis in alveolar macrophages and autophagy level.Results hUC-MSC-Exos with miR-451 inhibitor reduced burn-induced ALI and promoted macrophage autophagy.MiR-451 could be transferred from hUC-MSCs to alveolar macrophages via exosomes and directly targeted TSC1.Inhibiting miR-451 in hUC-MSC-Exos elevated TSC1 expression and inactivated the mTOR pathway in alveolar macrophages.Silencing TSC1 activated mTOR signaling and inhibited autophagy,while TSC1 knockdown reversed the autophagy from the miR-451 inhibitor-induced.Conclusion miR-451 from hUC-MSC exosomes improves ALI by suppressing alveolar macrophage autophagy through modulation of the TSC1/mTOR pathway,providing a potential therapeutic strategy for ALI.展开更多
目的观察外泌体circ-ZNF451基因表达水平对非小细胞肺癌(NSCLC)铁死亡进程及生存情况的影响。方法选择2020年6月至2022年2月接受放疗的90例NSCLC患者为研究对象,依据外泌体circ-ZNF451基因表达水平不同将入组患者分为高表达组(30例)与...目的观察外泌体circ-ZNF451基因表达水平对非小细胞肺癌(NSCLC)铁死亡进程及生存情况的影响。方法选择2020年6月至2022年2月接受放疗的90例NSCLC患者为研究对象,依据外泌体circ-ZNF451基因表达水平不同将入组患者分为高表达组(30例)与低表达组(60例)。比较两组治疗前后的铁死亡调控因子、近期疗效及远期预后,通过Spearman相关性系数检验ZNF451 m RNA表达水平与铁死亡进程及生存情况的关联。结果经实施直线加速器适形调强放疗后,低表达组P53、活性氧(ROS)均低于高表达组,酯酰辅酶A合成酶长链家族成员4(ACSL4)高于高表达组,差异有统计学意义(P<0.05);低表达组客观缓解率(ORR)、疾病控制率(DCR)、功能状态评分(KPS)、生活质量评分(QOL)评分均高于高表达组,体力状态评分(ZPS)低于高表达组,差异有统计学意义(P<0.05);经Spearman相关性系数检验,circ-ZNF451 m RNA相对表达量与NSCLC患者的ACSL4、KPS、QOL评分负相关,与P53、ROS、ZPS评分正相关。结论circ-ZNF451 m RNA与NSCLC患者的铁死亡进程有密切关联,抑制ZNF451 m RNA表达可促进肿瘤细胞的铁死亡进程,对增强放疗敏感性并改善患者预后均有积极意义。展开更多
基金supported by the tenth batch of"3221"industrial innovation and scientific research projects in Bengbu City(beng talent[2020]No.8)the 2021 Bengbu Medical College Science and Technology Project[Natural Science,Project Number:2021byzd217].
文摘Objective Our previous studies established that microRNA(miR)-451 from human umbilical cord mesenchymal stem cell-derived exosomes(hUC-MSC-Exos)alleviates acute lung injury(ALI).This study aims to elucidate the mechanisms by which miR-451 in hUC-MSC-Exos reduces ALI by modulating macrophage autophagy.Methods Exosomes were isolated from hUC-MSCs.Severe burn-induced ALI rat models were treated with hUC-MSC-Exos carrying the miR-451 inhibitor.Hematoxylin-eosin staining evaluated inflammatory injury.Enzyme-linked immunosorbnent assay measured lipopolysaccharide(LPS),tumor necrosis factor-α,and interleukin-1βlevels.qRT-PCR detected miR-451 and tuberous sclerosis complex 1(TSC1)expressions.The regulatory role of miR-451 on TSC1 was determined using a dual-luciferase reporter system.Western blotting determined TSC1 and proteins related to the mammalian target of rapamycin(mTOR)pathway and autophagy.Immunofluorescence analysis was conducted to examine exosomes phagocytosis in alveolar macrophages and autophagy level.Results hUC-MSC-Exos with miR-451 inhibitor reduced burn-induced ALI and promoted macrophage autophagy.MiR-451 could be transferred from hUC-MSCs to alveolar macrophages via exosomes and directly targeted TSC1.Inhibiting miR-451 in hUC-MSC-Exos elevated TSC1 expression and inactivated the mTOR pathway in alveolar macrophages.Silencing TSC1 activated mTOR signaling and inhibited autophagy,while TSC1 knockdown reversed the autophagy from the miR-451 inhibitor-induced.Conclusion miR-451 from hUC-MSC exosomes improves ALI by suppressing alveolar macrophage autophagy through modulation of the TSC1/mTOR pathway,providing a potential therapeutic strategy for ALI.
文摘目的观察外泌体circ-ZNF451基因表达水平对非小细胞肺癌(NSCLC)铁死亡进程及生存情况的影响。方法选择2020年6月至2022年2月接受放疗的90例NSCLC患者为研究对象,依据外泌体circ-ZNF451基因表达水平不同将入组患者分为高表达组(30例)与低表达组(60例)。比较两组治疗前后的铁死亡调控因子、近期疗效及远期预后,通过Spearman相关性系数检验ZNF451 m RNA表达水平与铁死亡进程及生存情况的关联。结果经实施直线加速器适形调强放疗后,低表达组P53、活性氧(ROS)均低于高表达组,酯酰辅酶A合成酶长链家族成员4(ACSL4)高于高表达组,差异有统计学意义(P<0.05);低表达组客观缓解率(ORR)、疾病控制率(DCR)、功能状态评分(KPS)、生活质量评分(QOL)评分均高于高表达组,体力状态评分(ZPS)低于高表达组,差异有统计学意义(P<0.05);经Spearman相关性系数检验,circ-ZNF451 m RNA相对表达量与NSCLC患者的ACSL4、KPS、QOL评分负相关,与P53、ROS、ZPS评分正相关。结论circ-ZNF451 m RNA与NSCLC患者的铁死亡进程有密切关联,抑制ZNF451 m RNA表达可促进肿瘤细胞的铁死亡进程,对增强放疗敏感性并改善患者预后均有积极意义。