中国组织工程研究 ›› 2021, Vol. 25 ›› Issue (25): 3970-3975.doi: 10.12307/2021.006

• 干细胞移植 stem cell transplantation • 上一篇    下一篇

Alpl基因影响骨髓间充质干细胞治疗溃疡性结肠炎

张立书1,2,刘安琪1,2,何小宁2,金  岩2,李  蓓2,金  钫1   

  1. 1军事口腔医学国家重点实验室,国家口腔疾病临床医学研究中心,陕西省口腔疾病临床医学研究中心,解放军第四军医大学口腔医院正畸科,陕西省西安市  710032;2解放军第四军医大学组织工程中心,陕西省西安市  710032
  • 收稿日期:2020-05-29 修回日期:2020-06-02 接受日期:2020-07-16 出版日期:2021-09-08 发布日期:2021-03-24
  • 通讯作者: 金钫,博士,主任医师,教授,军事口腔医学国家重点实验室,国家口腔疾病临床医学研究中心,陕西省口腔疾病临床医学研究中心,解放军第四军医大学口腔医院正畸科,陕西省西安市 710032
  • 作者简介:张立书,男,1990年生,山东省济南市人,汉族,2014年解放军第四军医大学毕业,医师,主要从事干细胞治疗与组织工程再生相关机制的研究。
  • 基金资助:
    国家自然科学基金(81870796),项目负责人:金钫;国家自然科学基金(81620108007),项目负责人:金岩

Alpl gene affects the therapeutic effect of bone marrow mesenchymal stem cells on ulcerative colitis

Zhang Lishu1, 2, Liu Anqi1, 2, He Xiaoning2, Jin Yan2, Li Bei2, Jin Fang1   

  1. 1State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Clinical Research Center for Oral Diseases, Department of Orthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China; 2Center for Tissue Engineering, The Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China
  • Received:2020-05-29 Revised:2020-06-02 Accepted:2020-07-16 Online:2021-09-08 Published:2021-03-24
  • Contact: Jin Fang, MD, Chief physician, Professor, State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Clinical Research Center for Oral Diseases, Department of Orthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China
  • About author:Zhang Lishu, Physician, State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Clinical Research Center for Oral Diseases, Department of Orthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China; Center for Tissue Engineering, The Fourth Military Medical University, Xi’an 710032, Shaanxi Province, China
  • Supported by:
    the National Natural Science Foundation of China, No. 81870796 (to JF); the National Natural Science Foundation of China, No. 81620108007 (to JY)

摘要:

文题释义:
Alpl基因:是参与编码一组非组织特异性碱性磷酸酶的基因,在骨质形成、牙齿发育和肝肾代谢中均发挥重要作用。在人类中,这种基因的突变与碱性磷酸酶表达过低相关,从而导致低碱磷酯酶症,表现为不同程度的骨骼发育缺陷。敲除Alpl基因的纯合子小鼠具有胚胎致死性,因此该实验选用Alpl杂合子(Alpl+/-)小鼠。
溃疡性结肠炎:是一种近年来发病率迅速增长的炎症性肠病,目前其发病具体机制尚不清楚,普遍认为是由机体免疫因素、肠道菌群和外界刺激共同作用导致的,临床主要表现为体质量减轻、腹泻和便血等,病理主要表现为结肠大量炎细胞浸润、溃疡形成以及黏膜结构消失等。

背景:骨髓间充质干细胞移植治疗溃疡性结肠炎已取得显著疗效,但是其具体作用机制尚未完全阐明。
目的:观察并探讨Alpl基因对骨髓间充质干细胞治疗溃疡性结肠炎的影响。
方法:①饲养并繁殖Alpl+/-小鼠与野生型小鼠,进行基因型鉴定;②体外培养Alpl+/-小鼠和野生型小鼠的骨髓间充质干细胞,观察细胞生长情况,成骨分化实验和流式细胞仪检测细胞表面标记物进行干细胞鉴定;③将24只C57BL/6小鼠随机分为正常组、模型对照组、野生型小鼠骨髓间充质干细胞治疗组、Alpl+/-小鼠骨髓间充质干细胞治疗组,后3组给予3%葡聚糖硫酸钠水溶液饲喂7 d诱导小鼠溃疡性结肠炎模型,2个治疗组小鼠在喂葡聚糖硫酸钠溶液第3天和第5天时分别尾静脉注射野生型小鼠或Alpl+/-小鼠来源的骨髓间充质干细胞,第10天处死取结肠组织;④记录每日体质量变化并计算疾病活动指数,比较结肠长度,苏木精-伊红染色观察比较结肠黏膜的组织学变化。
结果与结论:①基因型鉴定结果示杂合子为双条带,与美国杰克逊实验室提供的预测结果一致,提示成功繁育Alpl+/-小鼠;②两组细胞均能形成红棕色的成骨结节,且均表达间充质干细胞表面标记物CD146和CD73,但相较于野生型来源骨髓间充质干细胞,Alpl+/-小鼠来源骨髓间充质干细胞形态多样,缺乏边界清晰的长梭形细胞;③与模型对照组小鼠相比,2个治疗组小鼠肠炎症状和病理变化均减轻,但野生型小鼠骨髓间充质干细胞组的治疗效果明显优于Alpl+/-小鼠骨髓间充质干细胞组;④结果提示,骨髓间充质干细胞移植能够治疗葡聚糖硫酸钠诱导的溃疡性结肠炎,且Alpl基因半敲除抑制骨髓间充质干细胞对溃疡性结肠炎的治疗效果。
https://orcid.org/0000-0001-5011-7045(张立书) 

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: 干细胞, 骨髓间充质干细胞, 溃疡性结肠炎, 基因敲除, 碱性磷酸酶, 治疗, 小鼠

Abstract: BACKGROUND: Transplantation of bone marrow mesenchymal stem cells in the treatment of ulcerative colitis has achieved remarkable results, but the specific mechanism remains elusive.
OBJECTIVE: To observe and explore the role of Alpl gene in bone marrow mesenchymal stem cells on the treatment of ulcerative colitis.
METHODS:  (1) Alpl+/- mice and wild-type mice were raised and bred for genotyping. (2) Bone marrow mesenchymal stem cells Alpl+/- mice and wild-type mice were cultured in vitro, and cell growth was observed. Osteoblasts induction and flow cytometry assay were performed for stem cell characterization by detecting cell surface markers. (3) Twenty-four C57BL/6 mice were randomly divided into normal group, model control group, wild-type mouse bone marrow mesenchymal stem cell treatment group, and Alpl+/- mouse bone marrow mesenchymal stem cell treatment group. The latter three groups were fed with 3% dextran sulfate sodium solution for 7 days to induce ulcerative colitis in mice. Bone marrow mesenchymal stem cells from wild-type mice and Alpl+/- mice were injected via tail vein on day 3 and day 5 after administration of dextran sulfate sodium solution. On day 10, the colon tissue was collected. (4) Daily body weight changes were recorded and disease activity index was calculated. Colon length was compared. Hematoxylin-eosin staining was used to observe and compare the histological changes of colonic mucosa.  
RESULTS AND CONCLUSION: (1) The genotype identification showed that the heterozygotes were double bands, which was consistent with the prediction results provided by The Jackson Laboratory, indicating the Alpl+/- mice were successfully obtained. (2) Both groups of cells could form reddish brown osteogenic nodules, and both expressed classical mesenchymal stem cells markers CD146 and CD73. However, compared with wild-type bone marrow mesenchymal stem cells, Alpl+/- mouse bone marrow mesenchymal stem cells had various morphology and lack of long spindle cells with clear boundary. (3) Compared with the model control group, the enteritis symptoms and pathological changes of the two treatment groups were reduced, but the treatment effect of wild-type mouse bone marrow mesenchymal stem cell group was significantly better than that of Alpl+/- mouse bone marrow mesenchymal stem cell group. (4) The results suggest that bone marrow mesenchymal stem cell transplantation can treat ulcerative colitis induced by dextran sulfate sodium, and Alpl gene mutation inhibits the therapeutic effect of bone marrow mesenchymal stem cells on ulcerative colitis.


Key words: stem cells, bone marrow mesenchymal stem cells, ulcerative colitis, gene knockout, alkaline phosphatase, treatment, mice

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