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人脐带Wharton's Jelly及子宫内膜间充质干细胞免疫调节作用研究
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摘要
随着医学科学的发展,器官、组织及细胞移植已成为治疗许多疾病的常见而有效的方法。然而,人体内具有非常完善的防御机制,异体移植后,移植物作为一种异物被机体识别,从而动员机体免疫系统针对移植物进行攻击、破坏和清除引起排斥反应。免疫排斥反应对机体具有很大的破坏性,一旦发生排斥反应,外源移植物将会受到损伤,严重时会导致移植器官及组织功能的丧失,危及生命安全。另外,免疫系统疾病也是困扰医疗工作者的一大难题。自身免疫性疾病(autoimmune diseases, AD)是机体免疫系统对自身抗原攻击造成组织器官损伤和功能障碍的一种免疫应答紊乱疾病,具有较高的致残率和致死率,至今尚无有效的治疗方法。
     免疫抑制剂的主要作用是使机体降低对外源移植物的排斥反应,以使二者和平共处,因此在器官及组织移植和自身免疫性疾病的临床治疗中起着举足轻重的作用。但是,免疫抑制剂使用所引起的副作用,包括免疫抑制引起的感染、肿瘤发生率增加等给临床治疗提出了巨大的挑战。因此寻找更安全有效的治疗方法具有重要的现实意义。
     间充质干细胞(mesenchymal stem cells, MSCs)是一类中胚层来源的具有自我更新能力和多向分化潜能的多能干细胞,是重要的组织工程和细胞治疗的种子细胞。大量研究证明,MSCs还具有低免疫原性及免疫调节作用,可以有效抑制同种异体免疫排斥反应,延长移植物生存时间,提高移植成功率。另外一些研究表明,MSCs在造血干细胞移植(HSCT)导致的移植物抗宿主病(GVHD)以及自身免疫系统疾病方面也同样具有良好的治疗效果。然而,由于种种原因,对于MSCs的研究主要集中于骨髓源间充质干细胞(bone marrow mesenchymal stem cells, BMSCs)。BMSCs在成人骨髓内含量极低且需要创伤途径获取,另外,BMSCs随着年龄增长,其细胞数量和扩增、分化能力明显下降以及其所面临的伦理、法律等众多方面的问题使其应用受到一定限制。因此寻找新的MSCs替代来源,保证MSCs的数量是临床应用的前提。
     近年来的研究表明,人脐带Wharton's jelly间充质干细胞(MesenchymalStromal Cells derived from Wharton's jelly cells, WJCs)及人子宫内膜间质干细胞(endometrium Mesenchymal Cells, ERCs)是备受关注的新型种子细胞。与BMSCs相比WJCs及ERCs具有无可比拟的优势,WJCs及ERCs来源广泛,取材方便,可以无创伤获取,不涉及伦理问题,可以成为一种新的MSCs来源,具有良好的应用前景。
     本课题组率先在国内成功分离培养WJCs及ERCs,并发现WJCs及ERCs表达的表面标记物和BMSCs,几乎一样,可能具有和BMSCs相似的生物学特性。因此研究WJCs,及ERCs的免疫调节作用具有重要的现实意义,可以为临床应用和基础研究提供理论依据。
     本论文共分为二部分,第一部分:WJCs、ERCs的分离、培养及鉴定;第二部分:WJCs、ERCs的免疫调节作用研究。
     第一部分:本课题所用胎盘为正常剖宫产的健康产妇志愿捐献,经血由健康志愿者提供。本实验采用组织块贴壁法从人脐带Wharton's jelly中分离WJCs;密度梯度离心法从经血中分离ERCs;倒置显微镜观察细胞形态,流式细胞技术检钡WJCs及ERCs特异性表面标记;CCK-8试剂盒检测各代WJCs及ERCs的增殖活力。结果表明应用组织块贴壁法、密度梯度离心法可以分别从人脐带Wharton's jelly中及经血中成功分离、培养出MSCs;流式结果表明WJCs及ERCs:表达MSCs特异性标记物,低表达HLA-ABC,不表达HLA-DR,具低免疫源性;生长曲线结果表明各代WJCs及ERCs均具有良好的增殖活力。
     第二部分:采用原代培养后传至第三代的WJCs及ERCs,将WJCs、ERCs以及其培养上清分别与植物凝集素(PHA)刺激下的小鼠脾淋巴细胞及人外周血淋巴细胞共培养,多功能酶标仪检测’WJCs、ERCs,及其培养上清与PHA刺激下的小鼠脾淋巴细胞及人外周血T淋巴细胞共培养72h后的OD值,观察两种细胞及其培养上清对同源及异源淋巴细胞增殖的影响;另外本实验应用ELISA试剂盒对共培养上清中干扰素-γ(IFN-γ)及人转化生长因子(TGF-β1)表达量变化进行了检测,从细胞因子水平对WJCs,及ERCs的免疫调节作用机制进行了初步探讨。结果发现,WJCs、ERCs及其培养上清对PHA刺激下的小鼠脾淋巴细胞及人外周血淋巴细胞增殖都具有抑制作用,WJCs及ERCs能显著降低人外周血淋巴细胞IFN-γ的分泌。另外WJCs及ERCs可分泌TGF-β1,但同时在人外周血淋巴细胞中亦发现该细胞因子的分泌,且表达量高于WJCs及ERCs与淋巴细胞共培养组,因此TGF-β1可能不是在WJCs及ERCs免疫调节作用中起主要作用的细胞因子。
     总之,本研究成功从人脐带Wharton's jelly及经血中分离出MSCs, WJCs及ERCs免疫表型与BMSCs相似,且比BMSCs具有更强的扩增能力可做为一种新的MSCs来源。研究发现,WJCs及ERCs对同源及异源淋巴细胞都具有免疫调节作用,其作用机制可能与细胞间的直接接触及抑制淋巴细胞FN-γ的分泌有关。可以为减少异体移植引起的免疫排斥反应及治疗自身免疫系统疾病提供理论依据。
With the development of medicine science, transplantation of organs, tissues and cells has become the common and effective way to treat many disease. However, human body has very perfect defense mechanism, and exogenous graft can be recognized by the defense system firstly, then the immune system can be activated and cause rejection to attack, destroy and eliminate the graft. Immune rejection has great destructive to the human body. Exogenous graft will be injured when the rejection occured, severely, it will cause transplanted organs and tissues lose function and even made the life endanger. In addition, immune system diseases are also a serious problem which puzzled medical workers. Autoimmune disease is a disease of immune response disorder, which body immune system attacks autoantigen, causes tissue damage and organ dysfunction in diseases with high morbidity and mortality rates, and it has no effective treatment until now.
     The primary function of immunosuppressive agents is to reduce the body rejection for foreign objects to make them coexistence peacefully, so it plays an important role in the clinical treatment of organ or tissue transplantition and autoimmune diseases. However, the side effect of immunosuppressive agents, including infection and tumor incidence increased caused by immunosuppression presented such daunting challenges to the clinical treatment. So it has important practical significance to look for a safer and more effective treatment method.
     Mesenchymal stem cells are a class of mesodermal pluripotent stem cells which have self-renewal and multilineage differentiation potential that can be used as important seed cells for tissue engineering and cell transplantation. A large number of studies have shown that MSCs also have low immunogenicity and immune regulation, which can effectively inhibit the allogeneic immune rejection, extend the graft survival time and improve the success rate of transplantation. Other studies have shown that MSCs also have a good therapeutic effect in graft-versus-host disease and autoimmune diseases which are caused by hematopoietic stem cell transplantation. However, due to various reasons, the study of MSCs mainly focused on bone marrow mesenchymal stem cells, but bone marrow mesenchymal stem cells which are obtained by the traumatic method also declined in the quantity and quality in ageing people. So it is necessary for clinical application to search new types of stem cells which have a wide range of source and are easy to be collected, especially no ethics issue.
     Recent studies have shown that human umbilical cord Wharton s Jelly and menstrual blood-derived mesenchymal cells are a new type of seed cells with a high degree of self-renewal capacity and multi-differentiation potential.Compared with the BMSCs, WJCs and ERCs have lots of advantages. WJCs and ERCs not only have a wider range of source but also are easily to be collected without obvious ethics problems. Additionally, it also has stronger proliferation capability. Therefore, it can become a new source of MSCs and has good application prospects.
     Our research group took lead in the successful isolated culture of WJCs and ERCs, and found that the surface marker expression of WJCs and ERCs is almost the same as BMSCs', indicating WJCs and ERCs may have similar biological characteristics to BMSCs. Therefore, studing the immune regulation of WJCs and ERCs has important practical significance for clinical application and basic research.
     As followed below, this essay was divided into two parts. PartⅠ:Isolation, culture and identification of WJCs and ERCs, PartⅡ:The immune regulation research of WJCs and ERCs.
     PartⅠ:The human umbilical cords used in this subject were supplied by the Department of Obstetrics, First Affiliated Hospital, Zhengzhou University, Peripheral blood obtained from healthy volunteers. WJCs were separated by culture of tissue adherence. ERCs were separated by density gradient centrifugation. WJCs and ERCs morphous was observed with inverted microscope and the flow cytometer was performed to examine the expression of cell surface molecules. Futhermore, the P1, P3, P5 WJCs and ERCs growth activity were tested by CCK-8 kit. The results showed that WJCs can be isolated successfully by tissue culture method from human umbilical cord Wharton's jelly and ERCs can be isolated by density gradient centrifugation from menstrual blood. The result of FCM showed that the WJCs and ERCs express MSCs markers. Low expression of HLA-ABC while HLA-DR was negative, indicating that they only have low immunogenicity. Growth curve results showed that the P1, P3, P5 WJCs and ERCs have good growth vigor.
     PartⅡ:We used the P3 WJCs and ERCs which have strong proliferation, put WJCs, ERCs and their culture supernatant co-cultured with the mouse spleen lymphocytes and human peripheral blood lymphocytes simulated by PHA respectively to observe the effect of WJCs, ERCs and their culture supernatant to proliferation of homologous and heterologous lymphocyte. Then, expression of cytokines including human transforming growth factor (TGF-β1)and interferon-y (IFN-y) was aslo evaluated by ELISA detection kit. These experimentations were used to study the immune regulation mechanisms of WJCs and ERCs from the levels of cytokines secretion. The results showed that WJCs, ERCs and their supernatant can inhibite the proliferation of mouse spleen lymphocytes and human peripheral blood lymphocyte induced by PHA. IFN-y secretion of human peripheral blood lymphocytes can suppressed by WJCs and ERCs significantly. In addition, WJCs and ERCs may secrete TGF-β1, but human peripheral blood lymphocytes may secrete this cytokines too and the secretion of TGF-β1 more than WJCs, ERCs and human peripheral blood lymphocytes co-cultured group.
     In a word, WJCs and ERCs were isolated successfully from human umbilical cord Wharton's jelly and menstrual blood this study successfully isolated MSCs from Wharton's jelly and menstrual blood respectively, the immunephenotype of WJCs and ERCs is similar to BMSCs, and compared with BMSCs, they have a stronger proliferation capacity, so they can be used as a new kind of MSCs sources. The study found that WJCs and ERCs have a special immune regulation on both homologous and heterologous lymphocytes; the mechanism may be related to direct contact between cells and the secretion of some soluble molecule. It can be providing a theoretical basis to reduce immune rejection caused by allograft and treat autoimmune diseases.
引文
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