中国组织工程研究 ›› 2022, Vol. 26 ›› Issue (26): 4118-4122.doi: 10.12307/2022.812

• 组织构建临床实践 clinical practice in tissue construction • 上一篇    下一篇

上调滤泡调节性T细胞治疗肾移植抗体介导的排斥反应

徐  媛1,牛玉林1 ,袁智辉1,贾  磊2,潘光辉1   

  1. 贵州医科大学附属医院,1器官移植科,2肝胆外科,贵州省贵阳市   550004
  • 收稿日期:2021-07-05 接受日期:2021-08-21 出版日期:2022-09-18 发布日期:2022-03-08
  • 通讯作者: 潘光辉,主任医师,贵州医科大学附属医院器官移植科,贵州省贵阳市 550004
  • 作者简介:徐媛,女,1981年生,贵州省贵阳市人,汉族,硕士,副主任医师,主要从事器官移植研究。
  • 基金资助:
    贵州省教育厅青年科技人才成长项目(黔教合KY字[2018]190),项目负责人:徐媛;贵州省科技计划项目(黔科合平台人才[2018]5779-47),项目负责人:徐媛

Up-regulating follicular regulatory T cells for treating antibody-mediated rejection after kidney transplantation

Xu Yuan1, Niu Yulin1, Yuan Zhihui1, Jia Lei2, Pan Guanghui1    

  1. 1Department of Organ Transplantation, 2Department of Hepatological Surgery, the Affiliated Hospital of Guizhou Medical University, Guiyang 550004, Guizhou Province, China
  • Received:2021-07-05 Accepted:2021-08-21 Online:2022-09-18 Published:2022-03-08
  • Contact: Pan Guanghui, Chief physician, Department of Organ Transplantation, the Affiliated Hospital of Guizhou Medical University, Guiyang 550004, Guizhou Province, China
  • About author:Xu Yuan, Master, Associate chief physician, Department of Organ Transplantation, the Affiliated Hospital of Guizhou Medical University, Guiyang 550004, Guizhou Province, China
  • Supported by:
    Young Science and Technology Talents Development Project of the Educational Department of Guizhou Province, No. KY[2018]190 (to XY); Guizhou Provincial Science and Technology Plan Project of Guizhou Province, No. [2018]5779-47 (to XY)

摘要:

文题释义:
抗体介导排斥反应:亦称体液性排斥反应,是由抗体、补体等多种体液免疫效应因子参与所致的排斥反应免疫损伤,是肾移植后常见的排斥反应类型,由于病变表现程度不一、抗体检测技术水平的局限、C4d 染色方法的稳定性等因素,抗体介导排斥反应的免疫损伤机制较为复杂。
滤泡调节性T细胞:滤泡辅助性T细胞和滤泡调节性T细胞均定位于淋巴,滤泡调节性T细胞是Treg细胞的一个子集,与滤泡辅助性T细胞拥有共同的表型特征。滤泡辅助性T细胞和滤泡调节性T细胞在功能上相互制约,维持机体自身免疫反应的稳定进行,滤泡辅助性T细胞/滤泡调节性T细胞的免疫失衡使得自身抗体的产生失控,自身免疫耐受性丧失,最终引发自身免疫性疾病。
 
背景:由抗体介导排斥反应引起的移植肾失功目前临床尚缺乏有效的治疗手段。有研究显示肾移植患者血浆miR-4286的表达显著上调,miR-4286可靶向下调转化生长因子β的表达而激活免疫反应。
目的:探讨沉默miR-4286上调滤泡调节性T细胞治疗肾移植抗体介导排斥反应的作用及机制。
方法:选择贵州医科大学附属医院接受肾移植的患者,纳入20例肾移植抗体介导排斥反应患者与20例免疫耐受患者,对两组活检肾组织进行苏木精-伊红染色与C4d免疫组化染色,检测两组患者外周血淋巴细胞miR-4286 mRNA的表达与滤泡辅助性、调节性T细胞比例。将排斥反应患者淋巴细胞分组处理,空白载体组、miR-4286过表达组、miR-4286沉默组、转化生长因子β阻断组(该组转染miR-4286抑制的慢病毒载体的同时加入转化生长因子β中和抗体),48 h后,检测B细胞、浆细胞和滤泡调节性T细胞的比例,以及细胞上清转化生长因子β、干扰素γ、白细胞介素6和白细胞介素21的水平。
结果与结论:①苏木精-伊红染色显示,排斥反应组肾组织浸润的炎细胞数量高于免疫耐受组(P < 0.05);免疫组化染色显示,排斥反应组肾组织可见大量C4d阳性的细胞,免疫耐受组未见C4d阳性细胞。②排斥反应组miR-4286 mRNA表达量、滤泡辅助性T细胞比例高于免疫耐受组(P < 0.05),滤泡调节性T细胞比例低于免疫耐受组(P < 0.05)。Spearman相关分析显示,miR-4286表达与滤泡辅助性T细胞比例呈正相关,与滤泡调节性T细胞比例呈负相关。③与对照组比较,miR-4286过表达组转化生长因子β水平降低(P < 0.05),干扰素γ、白细胞介素6、白细胞介素21水平升高(P < 0.05);miR-4286沉默组转化生长因子β水平升高(P < 0.05),干扰素γ、白细胞介素6、白细胞介素21水平降低(P < 0.05)。与miR-4286沉默组比较,转化生长因子β阻断组转化生长因子β水平降低(P < 0.05),干扰素γ、白细胞介素6、白细胞介素21水平升高(P < 0.05)。④与对照组比较,miR-4286过表达组B细胞与浆细胞比例均升高(P < 0.05),滤泡调节性T细胞比例降低(P < 0.05);miR-4286沉默组B细胞与浆细胞比例均降低(P < 0.05),滤泡调节性T细胞比例升高(P < 0.05)。与miR-4286沉默组比较,转化生长因子β阻断组B细胞与浆细胞比例均升高(P < 0.05),滤泡调节性T细胞比例降低(P < 0.05)。⑤结果表明,miR-4286在肾移植抗体介导排斥反应患者外周血淋巴细胞中高表达,miR-4286沉默可通过转化生长因子β途径上调淋巴细胞中滤泡调节性T细胞比例,抑制体液免疫。
缩略语:滤泡辅助性T细胞:follicular helper T cell,Tfh;滤泡调节性T细胞:follicular regulatory T cell,Tfr

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程

关键词: 肾移植, 抗体介导排斥反应, miR-4286, 淋巴细胞, 滤泡调节性T细胞, 浆细胞, 转化生长因子β

Abstract: BACKGROUND: There is currently no effective treatment for kidney transplant failure caused by antibody-mediated rejection. Studies have shown that the expression of plasma miR-4286 in kidney transplant patients is significantly up-regulated, and miR-4286 can down-regulate the expression of transforming growth factor β to activate an immune response.
OBJECTIVE: To investigate the effect of miR-4286 silencing on up-regulating follicular regulatory T cells in the treatment of antibody-mediated rejection after kidney transplantation and its mechanism.
METHODS: Patients who underwent kidney transplantation at the Affiliated Hospital of Guizhou Medical University from December 2018 to December 2020 were enrolled and assigned into two groups (n=20 per group): antibody-mediated rejection group and immune tolerance group. Hematoxylin-eosin staining and C4d immunohistochemistry were performed for biopsy of kidney tissues. The mRNA expression of miR-4286 in peripheral blood lymphocytes and the proportions of follicular helper and follicular regulatory T cells were detected. The lymphocytes of patients suffering rejection reaction were divided into a blank vector group, a miR-4286 overexpression group, a miR-4286 silence group, and a transforming growth factor β blocking group in which the cells were simultaneously transfected with miR-4286-inhibited lentiviral vector and transforming growth factor β neutralizing antibody). After 48 hours, we detected the proportions of B cells, plasma cells, and follicular regulatory T cells, as well as the levels of transforming growth factor β, interferon γ, interleukin 6, and interleukin 21 in the cell supernatant.
RESULTS AND CONCLUSION: Hematoxylin-eosin staining results showed that the number of inflammatory cells infiltrated in the transplanted kidney tissue was higher in the antibody-mediated rejection group than the immune tolerance group (P < 0.05). Immunohistochemistry results showed that the antibody-mediated rejection group had a large number of C4d positive cells in the kidney tissue, while there were no C4d-positive cells in the immune tolerance group. The mRNA expression of miR-4286 and the proportion of follicular helper T cells in the antibody-mediated rejection group were higher than those in the immune tolerance group (P < 0.05). Spearman correlation analysis indicated that the expression of miR-4286 was positively correlated with the proportion of follicular helper T cells, while negatively correlated with the proportion of follicular regulatory T cells. Compared with the blank vector group, the level of transforming growth factor β was decreased in the miR-4286 overexpression group (P < 0.05), and the levels of interferon gamma, interleukin 6, and interleukin 21 were increased in the miR-4286 overexpression group (P < 0.05). Compared with the blank vector group, in the miR-4286 silence group, the level of transforming growth factor β was increased (P < 0.05), while the levels of interferon γ, interleukin 6, and interleukin 21 were decreased (P < 0.05). Compared with the miR-4286 silence group, the level of transforming growth factor beta was decreased in the transforming growth factor β blocking group (P < 0.05), and the levels of interferon γ, interleukin 6, and interleukin 21 was increased (P < 0.05). Compared with the blank vector group, the proportion of B cells and plasma cells was increased in the miR-4286 overexpression group (P < 0.05), and the proportion of follicular regulatory T cells was decreased (P < 0.05). Compared with the blank vector group, the proportion of B cells and plasma cells was decreased in the miR-4286 silence group (P < 0.05), and the proportion of follicular regulatory T cells was increased (P < 0.05). Compared with the miR-4286 silence group, the proportion of B cells and plasma cells was increased in the transforming growth factor β blocking group (P < 0.05), and the proportion of follicular regulatory T cells was decreased (P < 0.05). All these findings indicate that miR-4286 is highly expressed in peripheral blood lymphocytes of antibody-mediated rejection patients after kidney transplantation, and silencing of miR-4286 can up-regulate the proportion of follicular regulatory T cells in lymphocytes and inhibit humoral immunity through transforming growth factor β pathway.  

Key words: kidney transplantation, antibody-mediated rejection, miR-4286, lymphocyte, follicular regulatory T cell, plasma cell, transforming growth factor β

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