骨髓间充质干细胞经大鼠冠状动脉内移植可行性研究

目的 研究骨髓间充质干细胞经冠状动脉内移植的安全性及可行性。方法 左侧开胸结扎SD大鼠左冠状动脉，2周后取心脏建立Langerndorff模型。将CM-DiI标记的骨髓间充质干细胞悬液注入主动脉根部，同时收集右心房回流的液体，离心后通过流式细胞仪计数细胞数量。观察是否有细胞经冠状静脉回流及数量比例。并在不同时间测LVSP、LVDP、±dp/dt、心率，评价其安全性。在体实验中取心梗后2周的大鼠，经左心室--主动脉途径将细胞悬液注射到临时阻断的主动脉根部，分别在移植后1及24h和1及4周取材观察细胞在心脏内的位置及细胞的迁移情况。结果 离体实验发现经冠状动脉内注射髓间充质干细胞90%以上的细胞在心肌组织内存留，移植后对LVSP、LVDP、±dp/dt、心率没有明显变化。在体内实验中发现细胞移植后早期大部分细胞分布在心外膜下心肌组织内，在心内膜下组织内较少细胞分布，而且大部分细胞在正常心肌组织内，只有少量在心梗区域。而在细胞移植后1~ 4周存活的细胞多在心肌梗死及交界区组织内，在正常组织内很少有移植细胞存在。结论 经冠状动脉内途径进行细胞移植是安全可行的。     

骨髓间充质干细胞移植治疗失神经肌萎缩

背景:外科显微镜手术和一些辅助治疗方法均无法通过修复损伤的神经细胞来有效延缓或治疗失神经肌萎缩。研究发现骨髓间充质干细胞具有定向分化潜能,并且在一定环境因素下能对损伤的组织进行修复,由此推测其可以对失神经萎缩肌肉起到一定的修复作用。目的:探讨移植骨髓间充质干细胞是否能够减轻和延缓失神经肌肉组织萎缩。方法:分离培养SD大鼠骨髓间充质干细胞,取第3代骨髓间充质干细胞经BrdU标记后用于移植治疗。将30只SD大鼠分为3组,每组10只,对每只大鼠左后肢进行手术。假手术组只暴露坐骨神经主干,不钳夹神经,移植治疗组、模型对照组钳夹坐骨神经主干后,向其支配的腓肠肌注射骨髓间充质干细胞悬液和不含胎牛血清的DMEM培养液。骨髓间充质干细胞移植后1,2周,采用BBB评分评价各组大鼠左后肢运动功能;骨髓间充质干细胞移植后14 d,取腓肠肌组织进行苏木精-伊红染色和BrdU免疫组化染色。结果与结论:第3代骨髓间充质干细胞BrdU标记为阳性;标记的骨髓间充质干细胞能在移植治疗组失神经损伤的肌肉组织中存活并起修复作用;相对于模型对照组,移植治疗组失神经肌纤维由相互融合重新恢复规整。结果表明移植骨髓间充质干细胞能够减轻和延缓失神经肌肉组织萎缩。     

骨髓间充质干细胞移植治疗缺血性脑损伤的最新研究进展

脊髓间充质干细胞是一类多潜能的干细胞,它被移植入脑缺血灶后在一定程度上可以转化成为神经元和胶质细胞,从而发挥着替代受损的神经组织的功能。脑缺血是一种发病急且后果比较严重的疾病,探索干细胞移植治疗对缺血性脑损伤的作用具有重要的意义。     

骨髓间充质干细胞经大鼠冠状动脉内移植的可行性

目的 研究骨髓间充质干细胞经冠状动脉内移植的安全性及可行性.方法 左侧开胸结扎SD大鼠左冠状动脉,2周后取心脏建立Langerndorff模型.将CM-DiI标记的骨髓间充质干细胞悬液注入主动脉根部,同时收集右心房回流的液体,离心后通过流式细胞仪计数细胞数量.观察是否有细胞经冠状静脉回流及数量比例.并在不同时间测LVSP、LVDP、±dp/dt、心率,评价其安全性.在体实验中取心梗后2周的大鼠,经左心室-主动脉途径将细胞悬液注射到临时阻断的主动脉根部,分别在移植后1及24 h和1及4周取材观察细胞在心脏内的位置及细胞的迁移情况.结果 离体实验发现经冠状动脉内注射骨髓间充质干细胞90%以上的细胞在心肌组织内存留,移植后LVSP、LVDP、±dp/dt、心率没有明显变化.在体内实验中发现细胞移植后早期大部分细胞分布在心外膜下心肌组织内,在心内膜下组织内较少细胞分布,而且大部分细胞在正常心肌组织内,只有少量在心梗区域.而在细胞移植后1～4周存活的细胞多在心肌梗死及交界区组织内,在正常组织内很少有移植细胞存在.结论 经冠状动脉途径进行细胞移植是安全可行的.     

骨髓间充质干细胞移植治疗骨关节炎

BACKGROUND:As the ability of self-renewal, differentiation and migration into damaged tissues, bone marrow mesenchymal stem cells have been widely used in a variety of diseases. OBJECTIVE:To explore the therapeutic effect of bone marrow mesenchymal stem cell transplantation on osteoarthritis in rats. METHODS:Thirty-six Wistar rats were randomly assigned into transplantation, model or control group. osteoarthritis models were established in the transplantation and model groups, followed by tail vein injection of bone marrow mesenchymal stem cells (5×10⁷/kg) or the same volume of normal saline, respectively. Rats in the control group were subjected to no treatment. Four weeks after injection, levels of CD4⁺CD25⁺ regulatory T cells in the spleen, interleukin-17, tumor necrosis factor-α and transforming growth factor-β1 in serum were detected, and arthritis index and the degree of joint swelling were evaluated as well. RESULTS AND CONCLUSION:Compared with the control group, both arthritis index and degree of joint swelling were increased significantly in the model group (P < 0.05), but these indicators exhibited a remarkable improvement after cell transplantation (P < 0.05). Levels of CD4⁺CD25⁺ regulatory T cells in the spleen in the three groups were ranked as follows: the transplantation group > the control group > the model group. The levels of interleukin-17 and tumor necrosis factor-α in serum in the transplantation group were lower than those in the model group but higher than those in the control group (P < 0.05). Highest level of transforming growth factor-β1 was obtained in the transplantation group, followed by the control group and model group (P < 0.05). To conclude, these findings indicate that bone marrow mesenchymal stem cell transplantation exert therapeutic effects in osteoarthritis rats by immune and cytokine regulation.     

骨髓间充质干细胞移植治疗缺氧缺血性脑损伤的现状及进展

骨髓间充质干细胞是中胚层来源的具有自我更新和多项分化潜能的多能干细胞,在适宜的培养条件下可被诱导分化。有证据表明,骨髓间充质干细胞注射入脑后在体内外诸多影响因素作用下,可分化为神经元和成熟的胶质细胞。骨髓间充质干细胞的易获得性,多分化潜能等生物特性,使它在缺氧缺血性脑损伤中显示了巨大的潜在治疗价值。     

骨髓间充质干细胞经尾静脉移植治疗肝纤维化

BACKGROUND: Liver fibrosis is the early stage of terminal liver diseases. Effective treatment for liver fibrosis can prevent the occurrence of terminal liver diseases. Bone marrow mesenchymal stem cell transplantation is a promising method to treat liver fibrosis. OBJECTIVE: To study the therapeutic effect of bone marrow mesenchymal stem cells on liver fibrosis in rats. METHODS: Eighteen Sprague-Dawely rats were randomized into three groups: control, model and cell transplantation groups. Animal models of carbon tetrachloride-induced liver fibrosis were made in the latter two groups. After modeling, 1 mL bone marrow mesenchymal stem cells (5×105) or the same volume of normal saline was injected via the tail vein into the rats in the cell transplantation and model groups, respectively. Rats in the control group were given no treatment. Degree of liver fibrosis, liver function, histological changes of the liver were detected and observed in the three groups at 4 weeks after treatment. RESULTS AND CONCLUSION: In the control group, the liver tissues had normal structure with no fibrosis; in the model group, proliferation of fibrous tissues in the portal area of the liver, inflammatory cell infiltration, vacuolar degeneration and irregular arrangement of liver cells, and tissue structure damage were observed; in the transplantation group, liver tissue damage was severer than the control group but milder than the model group. Levels of serum hyaluronidase, type IV collagen and procollagen III were significantly lower in the cell transplantation group than the model group (P < 0.05). These findings indicate that bone marrow mesenchymal stem cell transplantation can alleviate liver fibrosis and improve liver function in rats with carbon tetrachloride-induced liver fibrosis.  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      

骨髓间充质干细胞移植治疗系统性红斑狼疮

BACKGROUND: The non-specific immune suppression method is generally used for treatment of systemic lupus erythematosus, but poor prognosis, such as infection and high recurrence rate, exists. OBJECTIVE: To evaluate the therapeutic effect of bone marrow mesenchymal stem cell transplantation on systemic lupus erythematosus in mice. METHODS: Sixteen mice with systemic lupus erythematosus were equivalently randomized into control and experimental groups, or then subjected to passage 3 bone marrow mesenchymal stem cell transplantation or the equal volume of normal saline via the tail vein, respectively. Mouse urine samples were collected to detect urine protein levels by Bradford method. Blood samples from the tip of the mouse tail were extracted to detect serum anti-ds-DNS antibody concentration by radioimmunoassay. Mouse kidney tissues were taken and observed pathohistologically through hematoxylin-eosin staining and immunohistochemistry staining under microscope. Flow cytometry was used to detect the expression of CD4+CD25+T cells in the inner canthus blood, fresh spleen and thymus. RESULTS AND CONCLUSION: Within 10 weeks after cell transplantation, the urine protein levels in the two groups were gradually increased, and the rising velocity was higher in the control group than in the experimental group. From the 4th to 10th week, the urine protein levels in the experimental group were significantly lower than those in the control group (P < 0.05). In the control group, lymphocyte infiltration was visible in the kidney tissues with a few of plasmocytes, and pathological findings showed the mice presented with interstitial nephritis; in the experimental group, the mice had no pathological changes in the kidney. In the two groups, immune complexes were found in the mesangial area, which showed a patch-like distribution in the control group and a punctate distribution in the experimental group; the relative proportion of the occupied area in the experimental group was significantly lower than that in the control group. The expression level of CD4+CD25+T cells in the blood and thymus were significantly higher in the experimental group than the control group (P < 0.05), and the expression level of CD4+CD25+T cells in the spleen was slightly higher in the experimental group than the control group with no significant difference (P > 0.05). The serum anti-ds-DNA antibody concentration in the experimental group was significantly lower than that in the control group (P < 0.05). Taken together, bone marrow mesenchymal stem cell transplantation can improve the pathological damage in systemic lupus erythematosus mice, and has a certain therapeutic effect on systemic lupus erythematosus.       

高压氧联合骨髓间充质干细胞移植修复缺氧缺血性脑损伤

背景：单纯骨髓间充质干细胞移植对脑梗死组织的修复作用并不理想,需要结合药物及生物工程材料等手段进行综合治疗。 目的：验证高压氧结合骨髓间充质干细胞移植修复大鼠缺氧缺血性脑损伤的效果。 方法：体外培养大鼠骨髓间充质干细胞。应用线栓法建立大脑中动脉阻塞大鼠模型,按随机区组法分为3组,即对照组、骨髓间充质干细胞移植组及高压氧+骨髓间充质干细胞移植组。静脉移植后24 h,3 d及伤后1,2 周行Longa行为学评分,检测神经功能的损伤情况。移植2周后,应用RT-PCR法测定生长相关蛋白43 mRNA的表达,并以BrdU免疫组化和苏木精-伊红染色行梗死处组织学检查以证实恢复程度。 结果与结论：移植后1周,高压氧+骨髓间充质干细胞移植组大鼠神经功能障碍评分低于骨髓间充质干细胞移植组,骨髓间充质干细胞移植组低于对照组(P  < 0.05)。2周后脑梗死周围组织生长相关蛋白43 mRNA的表达高压氧+骨髓间充质干细胞移植组高于骨髓间充质干细胞移植组,骨髓间充质干细胞移植组高于对照组(P < 0.05)。BrdU免疫组化和苏木精-伊红切片中的神经元数量高压氧+骨髓间充质干细胞移植组多于骨髓间充质干细胞移植组,骨髓间充质干细胞移植组多于对照组(P < 0.05)。提示高压氧联合骨髓间充质干细胞静脉移植治疗大鼠缺氧缺血性脑损伤可明显改善大鼠的神经功能,效果优于单纯骨髓间充质干细胞移植。     

骨髓间充质干细胞立体定向移植联合亚低温治疗大鼠脑损伤

背景：临床研究证明,亚低温(33~35 ℃)能有效减轻继发性脑和脊髓损伤,对中枢神经损伤有确切的保护作用。 目的：检测是否可以通亚低温治疗的方法提高骨髓间充质干细胞立体定向移植对重型颅脑损伤大鼠的治疗效果。 方法：采用液压颅脑损伤仪,给予Wistar大鼠2.53.31~303.98 kPa液压冲击力,制成重型液压颅脑损伤大鼠模型,将其随机分为脑损伤组,骨髓间充质干细胞移植组,亚低温+骨髓间充质干细胞组。后2组伤后6 h将体外培养的SD大鼠骨髓间充质干细胞立体定向移植到脑损伤灶内,亚低温+骨髓间充质干细胞组同时给予低温治疗。伤后第3天用Western Blot检测脑组织中AQP4蛋白合成的变化,采用干湿比重法测脑组织含水量。伤后24 h,3 d及伤后1,2 周行动物神经学缺损评分,2周后处死行免疫组织化学和苏木精-伊红染色。 结果与结论：亚低温治疗后,与脑损伤组和骨髓间充质干细胞移植组相比,亚低温+骨髓间充质干细胞组AQP4蛋白表达量及脑水肿程度也明显降低(P < 0.05),移植后1和2周,亚低温+骨髓间充质干细胞组的大鼠神经学缺损评分明显低于其他两组;且其脑组织切片中的神经元数量较其他两组明显增多(P < 0.01)。提示骨髓间充质干细胞立体定向移植联合亚低温治疗大鼠脑损伤可明显改善重型颅脑损伤后大鼠的神经学功能。     

不同途径移植骨髓间充质干细胞改善大鼠肝硬化

背景：骨髓间充质干细胞移植可减轻肝硬化程度,改善肝功能。 目的：观察不同途径移植骨髓间充质干细胞对四氯化碳诱导大鼠肝硬化的作用。 方法：将60只SD大鼠随机分为正常组、对照组、门静脉移植组、肝动脉移植组、尾静脉移植组,后4组采用四氯化碳联合乙醇制作肝硬化模型,对照组不进行移植,其余3组分别经门静脉、肝动脉、尾静脉移植大鼠骨髓间充质干细胞1×10⁶。 结果与结论：移植4周后,与对照组比较,移植3组大鼠肝功能均得到明显改善,血清白蛋白、胆碱酯酶显著升高(P < 0.05),转氨酶、胆红素、凝血时间、Ⅳ型胶原显著降低(P < 0.05),肝纤维化程度显著减轻(P < 0.05)。门静脉移植组及肝动脉移植组优于尾静脉移植组,前两者之间差异无显著性意义(P > 0.05)。说明经门静脉、肝动脉、尾静脉移植骨髓间充质干细胞均可减轻肝纤维化程度,改善肝功能,但肝动脉及门静脉移植途径优于外周血静脉途径。     

骨髓间充质干细胞移植治疗大鼠溃疡性结肠炎

背景：近年已有干细胞移植修复慢性肠炎受损组织的报道,但其治疗机制尚不明确。 目的：观察移植骨髓间充质干细胞在溃疡性结肠炎大鼠结肠的分布及分化情况,及对大鼠结肠黏膜的修复作用。 方法：取经鉴定的第3代大鼠骨髓间充质干细胞1×10⁶个,应用Hoechst 33342进行荧光标记,并将其经尾静脉移植入溃疡性结肠炎大鼠体内,分别于移植后3,7,14 d取材。 结果与结论：骨髓间充质干细胞移植后 3 d,大鼠结肠即可见荧光标记的细胞,移植后14 d,大鼠结肠荧光标记细胞仍较多,此时可见部分标记细胞表达细胞角蛋白。同时骨髓间充质干细胞移植后14 d,溃疡性结肠炎大鼠结肠黏膜白细胞介素10表达增高,肿瘤坏死因子α表达降低, 结肠黏膜的病理损伤明显好转。说明移植的骨髓间充质干细胞可迁移至结肠溃疡部位并分化为上皮细胞,同时可通过调节炎性因子的表达促进溃疡性结肠炎大鼠结肠黏膜损伤的修复。     

骨髓间充质干细胞移植治疗大鼠扩张型心肌病

1泸州医学院附属医院急诊科,四川省泸州市 646000;2哈尔滨医科大学附属第二医院心内科,黑龙江省哈尔滨市  150000 背景：扩张型心肌病所致的心肌纤维化是心力衰竭的病理基础,目前药物治疗、介入治疗和外科手术均不能替代坏死心肌和彻底改善心脏功能。 目的：观察异体骨髓间充质干细胞移植对大鼠扩张型心肌病心脏功能的作用和心肌纤维化的影响。 方法：40只Wistar大鼠随机数字表法分为细胞移植组(n=15)、对照组(n=15)和空白组(n=10),前2组建立大鼠扩张型心肌病模型。造模成功4周后细胞移植组注射骨髓间充质干细胞悬液150 μL(含3×106个细胞),对照组和空白组注射等量培养液。 结果与结论：与空白组相比,细胞移植组和对照组移植前左室收缩末期内径增加,射血分数和缩短分数明显下降(P < 0.01);移植后4周,细胞移植组超声心动图检查和移植前相比,左室收缩末期内径下降、射血分数和缩短分数明显升高(P < 0.01)。细胞移植组心脏胶原的表达低于对照组(P < 0.05)。与对照组相比,其他2组基质金属蛋白酶2及基质金属蛋白酶9表达明显下降(P < 0.05)。提示骨髓间充质干细胞移植后可改善心肌纤维化及扩张型心肌病鼠的心脏功能。      

骨髓间充质干细胞移植治疗肝硬化的研究进展

肝硬化是临床中常见的慢性进行性肝病,目前治疗晚期肝硬化最有效的方法是肝脏移植,但肝源缺乏、费用昂贵、移植排斥反应及长期应用免疫抑制剂引起并发症等成为限制其广泛应用的主要原因.干细胞移植有利于受损肝组织修复,能够代偿部分肝功能,已成为治疗肝病的一种新方法.就骨髓间充质干细胞移植治疗肝硬化的基础、临床研究进展、存在的问题以及发展前景作一综述,旨在为其进一步研究提供理论依据.     

骨髓间充质干细胞移植治疗骨质疏松的研究进展

骨质疏松症被定义为一种系统性骨骼疾病,其特征是骨量低、骨组织微结构恶化、骨脆性和骨折易感性增加。 目前有2亿多人患有骨质疏松症,但由于人口老龄化和人均寿命延长,受影响的人数仍在急剧增加,这是一个重大的公共卫生问题。目前,治疗骨质疏松症的药物开发已经取得了重大进展,但药物治疗并不能逆转骨丢失,且会给患者带来一系列毒副作用。大量研究表明,骨髓间充质干细胞的归巢作用、成骨分化和细胞因子作用在骨质疏松发病过程中发挥重要作用。 移植骨髓间充质干细胞作为一种新方法,不仅能避开药物治疗的副作用而且能从根本上治疗骨质疏松,具有巨大的潜能和应用价值,但许多问题也有待解决。     

骨髓间充质干细胞自体移植治疗阿霉素心肌病

目的:探讨骨髓间充质干细胞(MSCs)自体移植入兔阿霉素(ADR)心肌病心肌后的微环境依赖性分化及对心功能的影响。方法:日本大耳白兔随机分为:心肌病自体细胞移植组(n=10),心肌病对照组(n=8)及假手术组(n=6)。将自体MSCs和同体积的培养基分别移植入前两组动物心肌内,假手术组仅作开胸术而无移植。术后4周行心功能及组织学检测。结果:与假手术组相比,心肌病组的心功能明显降低;与心肌病对照组相比,自体移植组的心功能有显著改善,并在移植部位发现移植细胞有心肌肌钙蛋白T的表达。结论:MSCs移植入ADR心肌病的心肌组织中后,可在其微环境中存活并分化为心肌样细胞,并显著改善左室功能。     

人脐带间充质干细胞移植治疗大鼠创伤性脑损伤

背景：脐带间充质干细胞体内移植治疗脑损伤的效果目前尚较少见报道。 目的：观察人脐带间充质干细胞移植对大鼠液压冲击脑损伤的治疗作用。 方法：从新生儿脐带中分离、培养间充质干细胞。制作中度打击大鼠脑损伤模型。实验分为4组：①脐带间充质干细胞移植组：损伤后原位移植脐带间充质干细胞。②对照组：损伤后原位注射等量DMEN/F12培养基。③单纯损伤组：仅施行损伤。④假损伤组：仅切开头皮及颅骨,不实施机械性损伤。 结果与结论：脐带间充质干细胞移植后1~3周,动物神经功能评分较对照组明显改善;4周后,各组动物神经功能评分均恢复正常。免疫组织化学检测表明少部分移植细胞表达神经元特异性烯醇化酶,胶质纤维酸性蛋白。与对照组相比,移植组损伤区血管内皮生长因子表达明显增加,凋亡细胞减少。提示脐带充间质干细胞脑内移植有助于促进创伤性脑损伤后的早期功能恢复,这种治疗效果是通过刺激宿主细胞分泌血管内皮生长因子,增加损伤区微血管密度,抑制宿主细胞凋亡等实现的。     

骨髓间充质干细胞移植治疗脊髓损伤的途径及联合方式

背景：不同途径移植骨髓间充质干细胞后脊髓损伤的功能恢复程度存在较大差异,并且单纯的骨髓间充质干细胞移植对脊髓损伤的修复作用并不理想。 目的：综述骨髓间充质干细胞修复实验性脊髓损伤的移植途径及联合治疗方式。 方法：由第一作者检索1995年1月至2011年12月 CNKI数据库和Pubmed数据库相关文献。中文检索词为“骨髓间充质干细胞,细胞移植,脊髓损伤,移植途径,联合方式”;英文检索词为“Bone marrow mesenchymal stem cells,cellular transplant,spinal cord injury,explantation channel,modality alliance”。最终选择47篇文献进行综述。 结果与结论：细胞移植治疗脊髓损伤的途径方法很多,如：损伤局部移植、经脑脊液移植、静脉移植、腹腔移植及组织工程支架移植等。组织工程支架移植效果最佳,其次是损伤原位移植、经脑脊液移植,经静脉和腹腔移植效果较差。骨髓间充质干细胞联合生物工程材料、药物、物理等手段移植治疗脊髓损伤已经得到广泛学者的认可,但对于不同损伤时间、损伤方式和损伤程度移植治疗方案需要进一步规范和评估。     

自体骨髓间充质干细胞经动脉介入移植治疗犬糖尿病*

背景：目前多数研究倾向于将骨髓间充质干细胞经静脉移植等方法移植入糖尿病动物模型体内,而缺少将骨髓间充质干细胞经动脉介入移植入糖尿病动物模型胰腺内的相关研究。 目的：用自体骨髓间充质干细胞经动脉介入移植入糖尿病犬胰腺内,观察骨髓间充质干细胞的分布、分化、对糖尿病的治疗效果及安全性。 方法：将30只家犬随机分为骨髓间充质干细胞组(治疗组,n=13),糖尿病模型对照组(模型组,n=10)和对照组(n=7)。治疗组及模型组通过静脉注射四氧嘧啶建立糖尿病模型。造模后,治疗组进行胰岛素治疗,同时进行自体骨髓间充质干细胞的动脉介入移植。模型组仅接受胰岛素治疗,对照组则不接受任何治疗。 结果与结论：与模型组比较,治疗组于移植后第12周的胰岛素用量明显减少(P < 0.05),血清C-肽水平明显升高(P < 0.05)。治疗组于移植后第4周及12周的组织病理切片显示,心脏、肝脏、脾脏、肺脏、肾脏的组织结构清晰,均未发生坏死、纤维化,与模型组及对照组比较,移植后各器官组织形态无明显异常改变。移植后第4周,骨髓间充质干细胞主要分布在胰腺及肾脏内,免疫荧光发现胰腺内存在CM-DiI和胰岛素共表达细胞。表明将骨髓间充质干细胞经动脉介入移植入糖尿病犬胰腺内来治疗糖尿病的方法,是安全有效的。关键词：胰腺;移植;骨髓间充质干细胞;糖尿病;胰岛素 doi:10.3969/j.issn.1673-8225.2012.19.026     

骨髓间充质干细胞移植后在胸腺内的定居

BACKGROUND: Bone marrow mesenchymal stem cells have low immunogenicity and can induce immune tolerance. At present, the mechanism of immune regulation of bone marrow mesenchymal stem cells is not completely understood. It has been rarely reported whether the bone marrow mesenchymal stem cells can migrate to the thymus after transplantation.OBJECTIVE: To observe the distribution and survival of bone marrow mesenchymal stem cells in the thymus of aging rats after transplantation.METHODS:Bone marrow mesenchymal stem cells cultured in vitro were transfected by adenovirus vectors expressing green fluorescent protein. Transfected bone marrow mesenchymal stem cells were injected into the portal vein of aging rats. At days 3, 7, 14, 21 after transplantation, the survival of bone marrow mesenchymal stem cells homing to the thymus was observed under fluorescence microscope. At day 3 after transplantation, thymus tissues were taken and stained with hematoxylin-eosin for pathological observation. RESULTS AND CONCLUSION:Green fluorescent protein-labeled bone marrow mesenchymal stem cells had a strong green fluorescence at days 3 and 7 after transplantation, and the cell contour was clear. There was no significant difference in the mean absorbance values at days 3 and 7 (P > 0.05). Expression of green fluorescent protein was weakened significantly at days 14 and 21 compared with that at day 3 (P < 0.05). At 3 days after transplantation, the transplanted bone marrow mesenchymal stem cells were clearly visible in the thymus, and acute rejection was not observed. The results show that bone marrow mesenchymal stem cells can migrate to the damaged thymus tissue through the blood circulation, and can survive at least 1 week.  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