幽门螺杆菌诱导的胃癌细胞源性外泌体miR-382-5p通过靶向PTEN抑制巨噬细胞自噬并促进其M2极化OA北大核心CSTPCD
Gastric cancer cell-derived exosome miR-382-5p induced by Helicobacter pylori inhibits macrophage autophagy and promotes M2 polarization by targeting PTEN
目的:探讨幽门螺杆菌(H.pylori)诱导的人胃癌细胞源性外泌体miR-382-5p对巨噬细胞自噬和极化的影响及机制,为进一步阐明H.pylori的致癌机制提供新线索.方法:超高速离心法和试剂盒提取H.pylori刺激组和对照组AGS细胞释放的外泌体,采用透射电镜(TEM)、纳米粒子跟踪分析(NTA)和Western blot对外泌体进行鉴定;qRT-PCR检测H.pylori诱导的胃癌细胞AGS源性外泌体中miR-382-5p表达;将miR-382-5p mimic转染至THP-1巨噬细胞,Western blot检测巨噬细胞自噬标志物LC3Ⅱ、P62、Beclin-1的表达,免疫荧光检测自噬小体数量;Western blot检测PTEN蛋白、其下游蛋白PI3K、AKT、mTOR及其磷酸化蛋白p-PI3K、p-AKT、p-mTOR表达水平;流式细胞术检测巨噬细胞表型分子CD206和HLA-DR表达水平;ELISA检测巨噬细胞上清中细胞因子TNF-α、IL-6、IL-10和精氨酸酶1表达水平.结果:提取的外泌体符合外泌体形态,且高表达其表面标志蛋白CD9、CD63、TSG101;与空白对照组相比,H.pylori感染组AGS源性外泌体中miR-382-5p表达显著升高;miR-382-5p mimic转染导致巨噬细胞LC3、Beclin-1表达降低,P62表达升高,自噬小体数量降低;PTEN蛋白表达降低,p-PI3K、p-AKT、p-mTOR表达明显增加.转染同时导致巨噬细胞M2型标志蛋白CD206表达增加,M1型标志蛋白HLA-DR表达降低;IL-10和精氨酸酶1表达增加,IL-6和TNF-α表达降低.抑制剂BEZ235预处理可部分逆转miR-382-5p对巨噬细胞自噬和极化的影响.结论:H.pylori诱导的胃癌细胞源性外泌体miR-382-5p通过靶向PTEN基因,激活PI3K/AKT/mTOR信号通路抑制巨噬细胞自噬并促进其M2极化.
Objective:To investigate the effect and mechanism of the gastric cancer cells-derived exosome miR-382-5p in-duced by Helicobacter pylori(H.pylori)on the autophagy and polarization of macrophages,providing new clues for further elucidating the carcinogenic mechanism of H.pylori.Methods:Ultracentrifugation and exosome extraction kit were used to extract the exosomes re-leased by the H.pylori stimulated group and the blank control group AGS cells cells,then transmission electron microscopy(TEM),nanoparticle tracking analysis(NTA)and Western blot were employed to identify exosomes.qRT-PCR was used to detect the expres-sion of miR-382-5p in H.pylori induced AGS-derived exosomes.miR-382-5p mimic was transfected into THP-1 macrophages,then the expressions of autophagy markers(LC3Ⅱ,p62,and Beclin-1)were evaluated by Western blot,the number of autophagosomes was detected by immunofluorescence.The expression levels of PTEN protein,downstream proteins PI3K,AKT,mTOR and its phosphory-lated proteins p-PI3K,p-AKT,p-mTOR were detected by Western blot.Flow cytometry was used to detect the expression levels of macrophage phenotypic molecules CD206 and HLA-DR.ELISA was used to detect the secretion of cytokines TNF-α,IL-6,IL-10 and Arginase1 in macrophage supernatants.Results:The extracted exosomes were consistent with exosome morphology and highly ex-pressed the surface marker proteins CD9,CD63 and TSG101.Compared with the blank control group,the expression level of exosom-al miR-382-5p in H.pylori-infected group was significantly increased.miR-382-5p mimic transfection resulted in decreased expression of LC3 Ⅱ and Beclin-1 in macrophages,increased expression of P62 and decreased number of autophagosomes.Moreover,the protein expression level of PTEN was significantly decreased in the miR-382-5p mimic transfection group,while the expression levels of p-PI3K,p-AKT and p-mTOR were significantly increased.miR-382-5p mimic transfection also resulted in increased expression of mac-rophage M2 type marker protein CD206 and decreased expression of M1 type marker protein HLA-DR,as well as increased expres-sions of IL-10 and Arginine1,whereas decreased expression of IL-6 and TNF-α.Pretreatment with the pathway inhibitor BEZ235 par-tially reverses the effects of miR-382-5p on macrophage autophagy and polarization.Conclusion:H.pylori-induced gastric cancer cells-derived exosomal miR-382-5p suppresses macrophage autophagy and induces M2 polarization through down-regulation of PTEN ex-pression and activation of the PI3K/AKT/mTOR signaling pathway.
李文婧;张艳;郭开云;罗俊姿;何运兴;段洁;王娜;王昆宁;曾怿歆;罗心怡
南华大学衡阳医学院病原生物学研究所,特殊病原体防控湖南省重点实验室,衡阳 421001南华大学衡阳医学院病原生物学研究所,特殊病原体防控湖南省重点实验室,衡阳 421001||南华大学护理学院,衡阳 421001南华大学护理学院,衡阳 421001
基础医学
幽门螺杆菌外泌体miR-382-5p自噬巨噬细胞极化PI3K/AKT/mTOR信号通路
Helicobacter pyloriExosome miR-382-5pAutophagyMacrophage polarizationPI3K/AKT/mTOR signalling pathway
《中国免疫学杂志》 2024 (006)
1153-1159 / 7
湖南省自然科学基金面上项目(2021JJ30605);湖南省卫生健康委科研计划项目(C202302079056);湖南省大学生创新创业训练计划项目(202210555066);湖南省大学生创新创业训练计划项目(S202310555054,S202310555058).
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