大鼠骨髓mMSC和RS细胞肝组织内注射对肝硬化大鼠肝功能及肝脏病变的改善作用观察

目的 观察肝组织内注射大鼠成熟间充质干细胞(mature MSC,mMSC)与快速自我更新细胞(rapidly self-renewing cell,RS细胞)对肝硬化大鼠的治疗效果.方法 取2周龄Wistar雄性大鼠1只,处死后取胫骨、股骨,分离、培养、鉴定大鼠骨髓mMSC、RS细胞.取36只Wistar大鼠制备肝硬...     

间充质干细胞免疫调控功能研究新进展

间充质干细胞(mesenchymal stem cells,MSC)是具有自我更新和多向分化能力的成体干细胞的一种。近年来的相关研究表明,MSC具有低免疫原性,它可以通过抑制淋巴细胞的增殖、抑制抗原呈递细胞分化成熟及功能发挥、抑制CTL形成、增加调节性T细胞比例等多种途径发挥免疫调节作用。体内实验证明,MSC输注能够延长狒狒异体皮肤移植的存活时间,可减轻小鼠实验性自体免疫性脑脊髓膜炎。在临床上,MSC应用于异基因造血干细胞移植后移植物抗宿主病的预防和治疗效果显著。本文对MSC的免疫学特性及其在体内外试验中发挥的免疫调控功能的研究进展进行了综述。     

间充质干细胞及其临床应用中的几个问题

在血液病的治疗方面,骨髓造血干细胞的作用早已得到公识。目前,在许多国家间充质干细胞已经被批准进入多个临床试验,用于治疗移植物抗宿主病、克罗恩氏病、肝脏纤维化和骨关节损伤等多种疾病。然而,有关体内间充质干细胞的本质、体外培养后间充质干细胞的特性变化、细胞移植后在体内的分布、间充质干细胞治疗的作用机制及其临床应用的安全性等诸多根本性的问题,必须在间充质干细胞被广泛应用之前得以明确。这里尚有多少个不确定的环节?尚有多少个需要认识的关键性问题?文章结合以上问题,对近几年间充质干细胞的研究进展进行了综述和分析。     

脐带间充质干细胞治疗脊髓损伤临床分析

目的观察脐带间充质干细胞（UC-MSCs）鞘内注射治疗脊髓损伤（SCI）的临床效果及安全性。方法对2008年1月至2010年10月收治的22例SCI患者,给予UC—MSCs鞘内注射治疗,细胞数1×10^6个／（kg·次）,1次／周,4次为1个疗程,其中4例接受2个疗程,1例接受3个疗程,余均接受1个疗程。采用美国脊髓损伤协会制定的脊髓损伤神经功能评分标准（ASIA标准）对患者治疗前后神经功能进行评定,采用国际神经修复学会脊髓损伤功能评价量表（IANR—SCIRFS）对患者治疗前后日常生活活动能力进行评定。结果22例患者中13例有效,9例无效。不完全性SCI患者有效率达81．25％,完全性SCI的6例患者均无效。有5例有效的患者接受了2～3个疗程治疗,疗效均有进一步的提高。有效患者多表现为运动和／或感觉功能改善,大小便控制能力增强。22例患者治疗后1个月与治疗前比较,痛觉、触觉、运动、日常生活活动能力评分均有明显升高（P〈0．01）。治疗后常见的不良反应有头痛（1例）、腰痛（1例）,均在1～3d内消失。随访3个月至3年,无治疗相关不良事件发生。结论UC—MSCs鞘内注射治疗是安全的,可以改善大部分不完全性SCI患者的神经功能,提高这些患者的生活质量。     

Biological features of mesenchymal stem cells from human bone marrow

Objective To study the biological characteristics of mesenchymal stem cells (MSCs) from human bone marrow. Methods A culture of mesenchymal stem cells was initiated from bone marrow low-density mononuclear cells separated by Percoll Centrifugation and maintained in low-glucose Dulbecco’s modified Eagle’s medium (DMEM) with 10% selected fetal calf serum. Cell growth pattern and its responses to cytokines were evaluated by trypan blue exclusion and MTT test, respectively. Cell cycle and surface antigenic features were analyzed by flow cytometry technique. Cytochemistry characteristics of MSCs were determined.Results Easy-handling methods to isolate and culture expand MSCs were developed in this study. MSCs were unique in their phenotypes. They were positive for CD29, CD44, CD166, and negative for CD34, CD45, HLA-DR and Ulex europaeus. Cytochemistry evaluation showed that MSCs were homogeneously positive for acid α-naphthl acetate esterase (ANAE), glycogen (periodic acid Schiff reaction, PAS), and negative for acid phosphatase (ACP) and the Sudan black reaction (SB). Around 5% of them were positive for alkaline phosphatase (ALP). The cells had a population doubling time of 30 hours and cell cycle analysis showed that approximately 10% of them were in S phase. MSCs grew at significantly different rates when incubated in the presence of various recombinant human cytokines, of which interferon γ, tumor necrosis factor α, stem cell factor and insulin-like growth factor promoted the proliferation of MSCs dramatically, while others tested had no effects on cell growth. Conclusions MSCs are a homogenous population of cells that have unique growth, phenotypical and cytochemical characteristics. Furthermore, the diverse responses of MSCs to different cytokines provide a clue for the selection of optimal expansion and maintenance of MSCs.