中国组织工程研究 ›› 2024, Vol. 28 ›› Issue (13): 1996-2001.doi: 10.12307/2024.132

• 胚胎干细胞 embryonic stem cells • 上一篇    下一篇

Wnt信号通路与自身免疫调节因子共同参与胚胎干细胞向胸腺上皮祖细胞的分化

文廷浩1,李远迪1,何可可1,宋雯茜1,王先斌1,高  杰1,2,苏  敏1,3,胡  蓉1,3   

  1. 贵州医科大学,1基础医学院组织学与胚胎学教研室,2转化医学研究中心,3细胞工程生物医药技术国家地方联合工程实验室,贵州省再生医学重点实验室,中国医学科学院成体干细胞转化研究重点实验室,贵州省贵阳市   550025
  • 收稿日期:2023-02-17 接受日期:2023-04-07 出版日期:2024-05-08 发布日期:2023-08-28
  • 通讯作者: 胡蓉,博士,教授,贵州医科大学,基础医学院组织学与胚胎学教研室,细胞工程生物医药技术国家地方联合工程实验室,贵州省再生医学重点实验室,中国医学科学院成体干细胞转化研究重点实验室,贵州省贵阳市 550025
  • 作者简介:文廷浩,男,1994年生,贵州省贵阳市人,汉族,2023年贵州医科大学毕业,硕士,主要从事干细胞基础与自身免疫病研究。
  • 基金资助:
    国家自然科学基金(82171343,82060151),项目负责人:苏敏;贵州省科技计划项目(黔科合支撑[2020]4Y230号),项目负责人:苏敏;贵州省科技计划项目(黔科合平台人才[2020]4103号),项目负责人:苏敏;贵州省研究生科研基金(黔教合YJSKYJJ[2021]150),项目负责人:王先斌

Wnt signaling pathway is involved in differentiation of embryonic stem cells into thymic epithelial progenitor cells together with autoimmune regulators

Wen Tinghao1, Li Yuandi1, He Keke1, Song Wenqian1, Wang Xianbin1, Gao Jie1, 2, Su Min1, 3, Hu Rong1, 3   

  1. 1Department of Histology and Embryology, Basic Medical College, Guizhou Medical University, Guiyang 550025, Guizhou Province, China; 2Translational Medicine Research Center, Guizhou Medical University, Guiyang 550025, Guizhou Province, China; 3National Joint Local Engineering Laboratory for Cell Engineering and Biomedicine Technique, Guizhou Province Key Laboratory of Regenerative Medicine, Key Laboratory of Adult Stem Cell Translational Research (Chinese Academy of Medical Sciences), Guizhou Medical University, Guiyang 550025, Guizhou Province, China 
  • Received:2023-02-17 Accepted:2023-04-07 Online:2024-05-08 Published:2023-08-28
  • Contact: Hu Rong, MD, Professor, Department of Histology and Embryology, Basic Medical College, Guizhou Medical University, Guiyang 550025, Guizhou Province, China; National Joint Local Engineering Laboratory for Cell Engineering and Biomedicine Technique, Guizhou Province Key Laboratory of Regenerative Medicine, Key Laboratory of Adult Stem Cell Translational Research (Chinese Academy of Medical Sciences), Guizhou Medical University, Guiyang 550025, Guizhou Province, China
  • About author:Wen Tinghao, Master, Department of Histology and Embryology, Basic Medical College, Guizhou Medical University, Guiyang 550025, Guizhou Province, China
  • Supported by:
    National Natural Science Foundation of China, No. 82171343 (to SM); National Natural Science Foundation of China, No. 82060151 (to SM); Guizhou Provincial Science and Technology Plan Project, No. [2020]4Y230 (to SM); Guizhou Provincial Science and Technology Plan Project, No. [2020]4103 (to SM); Guizhou Provincial Graduate Research Fund, No. YJSKYJJ[2021]150 (to WXB)

摘要:


文题释义:

自身免疫调节因子(Aire):首次在自身免疫性多内分泌疾病-念珠菌-外胚层营养不良综合征(APECED)中发现,研究证实,Aire基因在免疫耐受中发挥着至关重要的作用,其在胸腺上皮细胞中大量表达。
胸腺上皮祖细胞:是胸腺上皮细胞的前体细胞,可在体外由胚胎干细胞定向诱导分化而来,该实验方法也将为相关实验研究提供细胞来源。


背景:自身免疫调节因子(autoimmune regulator gene,Aire)及Wnt信号通路在小鼠胚胎干细胞多能性的维持及分化中都发挥着重要作用,但Wnt信号与Aire是否参与了小鼠胚胎干细胞向胸腺上皮祖细胞的分化尚未可知。

目的:探讨Wnt信号通路和自身免疫调节因子与胚胎干细胞分化的关系。
方法:采用两步分化方法定向诱导小鼠胚胎干细胞分化为内胚层再分化为胸腺上皮祖细胞,然后用Aire shRNA慢病毒感染小鼠胚胎干细胞,嘌呤霉素筛选单克隆稳定株,再采用两步分化方法进行诱导分化,分别于定向诱导分化第0,3,10天,采用细胞免疫荧光、流式细胞术、Western blot、Real-Time qPCR检测相关基因及蛋白的表达变化。

结果与结论:①定向诱导分化第0天,免疫荧光染色显示SSEA1、OCT4表达呈阳性;②定向诱导分化第3天,免疫荧光染色显示SOX17、FOXA2表达呈双阳性;③定向诱导分化第10天,流式细胞术结果显示EPCAM1、K5、K8表达呈阳性;④与未分化的小鼠胚胎干细胞相比,诱导分化的胸腺上皮祖细胞中Wnt7a、β-catenin、Gsk-3β蛋白表达升高,Aire蛋白表达降低;⑤与未分化的小鼠胚胎干细胞相比,诱导分化的胸腺上皮祖细胞中Wnt7a、β-catenin、Gsk-3β及Aire mRNA表达升高;⑥与正常培养的小鼠胚胎干细胞及其最终分化的胸腺上皮祖细胞相比,敲低Aire基因的小鼠胚胎干细胞及其最终分化的胸腺上皮祖细胞中Wnt7a、β-catenin、Gsk-3β蛋白表达水平降低。综上所述,Wnt信号通路和Aire共同参与了小鼠胚胎干细胞定向诱导分化为小鼠胸腺上皮祖细胞的过程。

https://orcid.org/0000-0001-5253-3085 (胡蓉) 

中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程

关键词: Wnt信号通路, 自身免疫调节因子, 胚胎干细胞, 胸腺上皮祖细胞, 内胚层细胞

Abstract: BACKGROUND: Autoimmune regulator gene (Aire) and Wnt signaling pathway play an important role in the maintenance and differentiation of mouse embryonic stem cell pluripotency. However, whether the Wnt signal and Aire are involved in the differentiation of embryonic stem cells to thymic epithelial progenitor cells remains poorly understood. 
OBJECTIVE: To investigate the relationship of the Wnt signaling pathway and Aire with the differentiation of embryonic stem cells. 
METHODS: A two-step differentiation method was used to induce mouse embryonic stem cells to differentiate into endoderm and then into thymic epithelial progenitor cells. Mouse embryonic stem cells were infected with Aire shRNA lentivirus, and monoclonal stable strains were screened by puromycin. Mouse embryonic stem cells were collected on days 0, 3 and 10 of the directed induction of differentiation after the induced differentiation by the two-step differentiation method. Cellular immunofluorescence, flow cytometry, western blot assay, and real-time qPCR were used to detect the expression changes of related genes and proteins.
RESULTS AND CONCLUSION: (1) Immunofluorescence staining showed positive expression of SSEA1 and OCT4 on day 0 of targeted induction of differentiation. (2) Immunofluorescence staining showed double-positive expression of SOX17 and FOXA2 on day 3 of targeted induction of differentiation. (3) Flow cytometry results showed positive expression of EPCAM1, K5 and K8 on day 10 of targeted induction of differentiation. (4) Compared with undifferentiated mouse embryonic stem cells, the expressions of Wnt7a, β-catenin, and Gsk-3β proteins were elevated, and the expression level of Aire protein was decreased in induced differentiated thymic epithelial progenitor cells. (5) Compared with undifferentiated mouse embryonic stem cells, the expressions of Wnt7a, β-catenin, Gsk-3β and Aire mRNA were elevated in thymic epithelial progenitor cells. (6) Compared with normal cultured mouse embryonic stem cells and their ultimately differentiated thymic epithelial progenitor cells, the expression levels of Wnt7a, β-catenin and Gsk-3β proteins were reduced in mouse embryonic stem cells with knockdown of Aire genes and their final differentiated thymic epithelial progenitor cells. In conclusion, the Wnt signaling pathway and Aire are jointly involved in the process of targeted induction of differentiation of mouse embryonic stem cells into mouse thymic epithelial progenitor cells. 

Key words: Wnt signaling pathway, autoimmune regulator, embryonic stem cell, thymic epithelial progenitor cell, endoderm cell

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