骨髓间充质干细胞参与皮脂腺导管构成的初步研究

目的　探讨骨髓间充质干细胞 (MSCs)分化为皮肤附属器的可行性。方法　抽取小型香猪的骨髓 ,经密度梯度离心分离、体外纯化间充质干细胞及培养扩增后 ,应用 5 溴脱氧尿嘧啶(BrdU)标记技术进行细胞标记。将已标记的细胞 (1× 10 6)以注射方式回植到提供骨髓的猪的皮内及皮下 ,分别于注射后 1、2、4周取材 ,常规石蜡包埋、切片 ,行HE染色及BrdU和角蛋白免疫荧光染色 ,激光共聚焦显微镜观察。结果　部分BrdU阳性标记细胞出现在皮脂腺周围的导管中参与皮脂腺导管的形成 ,并同时表达角蛋白。结论　在皮肤微环境下骨髓间充质干细胞可以分化为皮脂腺导管细胞。     

在体诱导骨髓间充质干细胞分化为表皮细胞的初步研究

目的探讨骨髓间充质干细胞(MSCs)分化为表皮细胞的可行性.方法抽取小型香猪的骨髓,经密度梯度离心分离、纯化间充质干细胞及培养扩增后,应用5-溴脱氧尿嘧啶(BrdU)标记技术进行细胞标记.将已标记的细胞以注射方式回植到提供骨髓的猪的皮内及皮下,分别于注射后1、2、4周取材,常规石蜡包埋,行BrdU和角蛋白免疫荧光双染色,激光共聚焦显微镜观察.结果大多数BrdU阳性细胞聚集在真皮中的小血管周围.但有少数BrdU阳性标记细胞出现在表皮的棘层和颗粒层,并同时表达角蛋白.结论在皮肤微环境下骨髓间充质干细胞具有分化为表皮细胞的潜能.     

骨髓间充质干细胞分化为神经细胞研究进展

骨髓间充质干细胞(BMSC)分化为神经细胞的研究旨在诱导分化出具有分泌神经递质和电生理功能的成熟神经细胞,并提高神经细胞分化率.细胞因子诱导、中药及其提纯物诱导、细胞共培养诱导及提高细胞内环磷腺苷诱导等方案有助于BMSC分化为神经细胞,但体内实验诱导分化率远较体外实验低.不同浓度的细胞因子有不同的诱导分化率,中药及其提...     

骨髓间充质干细胞研究进展

近年来 ,骨髓间充质干细胞 (MSC)受到学者的广泛关注 ,该细胞易于分离扩增 ,在适宜的条件刺激下 ,可向多方向分化 ,被称为组织工程的“种子细胞” ,又由于该细胞在体内外表达各种治疗性外源目的基因 ,被公认为是一种基因治疗的靶细胞 ,本文试就其生理功能、表面标记研究进展作一综述。一、骨髓间充质干细胞的生理功能1.支持造血 :在网状组织 ,巨噬细胞和微血管等构成的造血微环境中 ,通过成纤维细胞集落形成单位 (CFU F)鉴定MSC ,约占骨髓内单核细胞总数的 10 4至 10 5分之一 ,但是MSC发挥了重要作用。MSC可以同其他间充质祖细胞一起…     

骨髓间充质干细胞对胶质瘤趋向性的研究

目的 利用体内、外迁移模型观察骨髓间充质干细胞对胶质瘤的趋向性。方法 体外应用圆环柱细胞共培养体系、Matrigel细胞球体共培养体系和Transwell双室培养体系模型观察BMSCs向胶质瘤细胞的趋瘤效应。建立颅内c6胶质瘤模型，将预先标记BrdU的BMSCs注射人对侧脑半球。免疫学方法检测BMSCs在胶质瘤内的分布。结果 3种体外模型从不同角度显示了BMSCs的胶质瘤趋向性的存在。体内经对侧注射的BMSCs向肿瘤侧发生迁移，主要分布于包括浸润区和肿瘤小灶在内的肿瘤与正常脑组织交界部位。结论 BMSCs具有明显的胶质瘤趋向性，可作为治疗胶质瘤新的侯选的基因药物投递系统。     

人骨髓间充质干细胞向软骨细胞定向分化的研究

目的探讨体外单层培养中诱导人骨髓间充质干细胞(Human Bone Marrow-derived Mesenchymal Stem Cells,hBMSCs)向软骨细胞定向分化的条件.方法采集志愿者骨髓3例,分离培养BMSCs,流式细胞仪分析表面标志.用含TGF-β1的无血清诱导培养基培养7d后,分别行Ⅱ型胶原免疫组化、原位杂交检测,碱性磷酸酶染色,3H标记的胸腺嘧啶脱氧核苷(3H-TdR)掺入实验检测细胞的增殖情况.结果培养的BMSCs表达CD9,而CD34、CD38、CD45、CD61呈阴性.细胞经诱导培养7d后免疫组化、原位杂交可检测到Ⅱ型胶原的表达,碱性磷酸酶染色呈弱阳性,但细胞3H-TdR掺入量低于对照组(P<0.05).结论BMSCs在特定的诱导下能向软骨细胞方向分化,但在无血清培养基中无法有效的增殖.     

成人骨髓间充质干细胞体外诱导分化为软骨细胞的实验研究

目的研究体外三维培养条件下,成人骨髓间充质干细胞(BMSCs)定向分化软骨细胞可行性。方法用密度梯度离心法分离纯化BMSCs,并传代扩增后,用离心三维培养法在软骨诱导剂下进行诱导培养,以常规培养液培养的BMSCs作为阴性对照,于诱导培养第21天取出标本行苏木精-伊红染色、甲苯胺蓝染色、s-100蛋白免疫组织化学检测。结果BMSCs经21d的离心三维诱导培养后,培养管出现软骨外观组织块,组织切片甲苯胺蓝染色呈明显异染,s-100蛋白免疫细胞化学检测阳性。对照组阴性。结论成人BMSCs在三维培养条件下可成功诱导分化为软骨细胞。     

兔骨髓间充质干细胞分离方法的比较

目的：建立并优化骨髓间充质干细胞分离纯化的方法。方法：从兔的胫骨中抽取骨髓，分别通过直接培养、经Fichu—Hypeque和Perool两种分离介质进行分离后再培养的方法，收获所培养的细胞，然后测量间充质干细胞所占的比例。结果:直接培养、经Fichu—Hypaque、Perool分离后再培养的细胞中，骨髓间充质干细胞比例分别为67．3％、83．6％、93．4％。结论:采用Perool分离方法可以更好的提高MSCs的纯度，提高MSCs的培养效率。     

骨髓间充质干细胞软骨分化生物学的影响因素

间充质干细胞(MSCs)因具有在适宜的体内或体外条件下分化形成软骨组织的潜能，且易于从骨髓中分离和体外大量扩增纯化，便于自体移植，故被认为是软骨组织工程最有希望的种子细胞来源之一。然而，MSCs在体外培养条件下软骨表型的分化却是一个受多种因素限制的复杂过程。目前其调控机制仍不是很清楚。已知局部环境是影响MSCs向软骨细胞转化的重要因素，低氧张力、高细胞密度、局部应     

骨髓间充质干细胞体外定向软骨细胞分化的研究

目的　研究体外培养的兔骨髓间充质干细胞在特定培养条件下定向软骨细胞分化的情况。方法　取兔髂骨骨髓 ,分离培养骨髓间充质干细胞 ,传代后以高糖DMEM无血清特定培养诱导 (转化生长因子 β1 2 0ug L ,地塞米松10 7mmol L ,维生素C 5 0ug L) ,细胞 爬片甲苯胺蓝染色检测蛋白多糖 ,免疫细胞化学染色法检测Ⅱ胶原 ,S 10 0蛋白分泌 ,常规培养的细胞作为对照组。结果　骨髓间充质干细胞经特定培养条件诱导第 14 ,2 1,2 8天甲苯胺蓝染色呈明显异染 ,Ⅱ胶原 ,S 10 0蛋白免疫细胞化学染色阳性 ,第 7天及对照组阴性。结论　骨髓间充质干细胞是骨髓来源的具有多向分化潜能的干细胞 ,在体外培养可定向分化为软骨细胞 ,并能分泌软骨特异性基质。     

诱导大鼠骨髓间充质干细胞分化为唾液腺腺泡样细胞的实验研究

目的:探讨在共培养系统下大鼠骨髓间充质干细胞分化为唾液腺腺泡样细胞的实验.方法:以纯化1代SD大鼠颌下腺腺泡细胞和3代骨髓间充质干细胞作为共培养实验对象.实验分组:含唾液腺培养液的共培养组;含10%FBS、DMEM/F12的共培养组;含唾液腺培养液的非共培养组;含10%FBS、DMEM/F12的非共培养组.培养1个月经α-淀粉酶(α-amylase)免疫组化染色各组的MSCs,计算阳性细胞数得出MSCs的转化率,并且通过光镜和电镜鉴定细胞形态变化.结果:各组诱导的MSCs经α-amylase染色,共培养组阳性细胞数较非共培养组多(P＜0.05),且诱导成功的细胞在镜下形态类似于唾液腺腺泡细胞.结论:在共培养条件下成功实现了MSCs向 SGCs的形态学转化,唾液腺专用培养液能够提高SGCs的诱导效率.     

聚乙烯亚胺介导骨形态发生蛋白2基因转染骨髓间充质干细胞的研究

目的 观察聚乙烯亚胺(PEI)转染骨髓间充质干细胞(BMSCs)的效率,从而优化可用于转染实验的条件.方法 利用细胞计数试剂盒(CCK-8)比色法检测0.2％～2.0％ PEI的细胞毒性,利用荧光显微镜和流式细胞仪测定N/P 3.97～ 37.75的转染效率、培养液中的氯喹(0～100 μmol/L)、10％白蛋白、5％血清及0～ 20 mmol/L Mg2+对PEI转染BMSCs效率的影响.结果 当完全培养基内的PEI浓度低于0.8％,BMSCs存活率为70％；N/P 15时PEI转染BMSCs的效率为14.4％；溶酶体抑制剂氯喹可增加PEI的转染效率,培养液中的10％白蛋白、5％血清及Mg2+可降低PEI转染效率.结论 PEI是一种有效的BMSCs非病毒转染剂.     

骨髓间充质干细胞对肝癌影响作用的研究进展

肝癌术后患者常因肝脏组织代偿和恢复功能受限,术后急性肝衰竭的发病率及病死率较高.骨髓间充质干细胞可以在肝脏微环境下直接分化为新的肝细胞,通过分泌营养因子促进组织修复、参与免疫调节、抗纤维化和抑制肝星状细胞和肝原细胞的活性等,对肝损伤及肝功能不全具有较好的疗效.然而骨髓间充质干细胞同时具有致瘤性和促进肿瘤生长的作用.利用骨髓间充质干细胞预防和治疗肝癌术后肝衰竭的发生是否安全可靠,这是目前研究的热点问题.本文就骨髓间充质干细胞对于原发性肝癌影响作用的研究进展进行综述,以期为干细胞的临床应用提供理论基础.     

骨髓间充质干细胞对骨质疏松的治疗作用

骨髓间充质干细胞(bone marrow mesenchymal stem cells,BMSCs)已被证明具有多向分化潜能、自我更新并能诱导分化成多种细胞类型的功能。骨髓间充质干细胞作为一种治疗骨质疏松的新方法,可以有效增加局部骨量,提高骨密度,增强骨强度,为治疗骨质疏松症提供新策略,已经成为再生医学很有前途的研究领域。     

Autologous platelet-rich plasma induces bone formation of tissue-engineered bone with bone marrow mesenchymal stem cells on beta-tricalcium phosphate ceramics

Background

The purpose of the study is to investigate whether autologous platelet-rich plasma (PRP) can serve as bone-inducing factors to provide osteoinduction and improve bone regeneration for tissue-engineered bones fabricated with bone marrow mesenchymal stem cells (MSCs) and beta-tricalcium phosphate (β-TCP) ceramics. The current study will give more insight into the contradictory osteogenic capacity of PRP.

Methods

The concentration of platelets, platelet-derived growth factor-AB (PDGF-AB), and transforming growth factor-β1 (TGF-β1) were measured in PRP and whole blood. Tissue-engineered bones using MSCs on β-TCP scaffolds in combination with autologous PRP were fabricated (PRP group). Controls were established without the use of autologous PRP (non-PRP group). In vitro, the proliferation and osteogenic differentiation of MSCs on fabricated constructs from six rabbits were evaluated with MTT assay, alkaline phosphatase (ALP) activity, and osteocalcin (OC) content measurement after 1, 7, and 14 days of culture. For in vivo study, the segmental defects of radial diaphyses of 12 rabbits from each group were repaired by fabricated constructs. Bone-forming capacity of the implanted constructs was determined by radiographic and histological analysis at 4 and 8 weeks postoperatively.

Results

PRP produced significantly higher concentration of platelets, PDGF-AB, and TGF-β1 than whole blood. In vitro study, MTT assay demonstrated that the MSCs in the presence of autologous PRP exhibited excellent proliferation at each time point. The results of osteogenic capacity detection showed significantly higher levels of synthesis of ALP and OC by the MSCs in combination with autologous PRP after 7 and 14 days of culture. In vivo study, radiographic observation showed that the PRP group produced significantly higher score than the non-PRP group at each time point. For histological evaluation, significantly higher volume of regenerated bone was found in the PRP group when compared with the non-PRP group at each time point.

Conclusions

Our study findings support the osteogenic capacity of autologous PRP. The results indicate that the use of autologous PRP is a simple and effective way to provide osteoinduction and improve bone regeneration for tissue-engineered bone reconstruction.

     

Germ cell differentiation of bone marrow mesenchymal stem cells

Bone marrow mesenchymal stem cells (BM‐MSCs) were first cultured under induction of retinoic acid (RA), Sertoli cells conditioned medium and RA + con (conditioned medium) as treatment groups. The presence of Sertoli cells was confirmed by immunocytochemistry of follicle‐stimulating hormone receptor in Sertoli cells and flow cytometry by anti‐Gata4 antibody. Cell viability and morphology of nucleus and cytoplasm of BM‐MSCs were evaluated by MTT test and DAPI staining respectively. The expression of Oct4, Plzf, Scp3, Caspases 8, 9 and 3 genes was evaluated by RT‐PCR. For increasing the accuracy of experiment, the expression of Vasa and SCP3 genes was investigated quantitatively by real‐time PCR after 0, 5, 10, 15 days of culture. The results showed that the number of apoptotic cells increased in RA group. The expression of apoptosis genes (Caspases 3, 8 and 9) was also observed in this group all days of culture. Measurement of Vasa and Scp3 genes by RT‐PCR confirmed the positive effects of retinoic acid on increasing of genes expression. So, in this study, a group with maximum expression of differentiation genes and minimum expression of apoptotic genes was RA + conditioned medium group. DNA fragmentation was not observed in all groups.     

人骨髓间充质干细胞向汗腺样细胞诱导分化的研究

目的：观察体外热休克汗腺细胞（SGCs）和人骨髓间充质干细胞（BM-MSCs）共培养体系中 BM-MSCs的形态和表型变化,为进一步表观遗传学表达谱的检测及汗腺诱导关键转录因子的研究提供实验基础。方法：体外分离、培养、扩增人BM-MSCs和 SGCs,成骨和成脂诱导分化以鉴定BM-MSCs 的分化功能。在 Tran-swell间接共培养体系中,培养的BM-MSCs和经47℃高温处理造成热休克的 SGCs 在 Transwell 板中间接共培养;在Transwell＋诱导因子共培养体系中,上室的BM-MSCs培养基中添加了汗腺诱导因子（无汗性外胚叶发育不良蛋白、重组人表皮生长因子和胰岛素-转铁蛋白-亚硒酸钠）。监测共培养过程中BM-MSCs的细胞形态变化,免疫荧光法检测诱导后BM-MSCs的表型改变。结果：经与热休克 SGCs 共培养诱导10 d后,部分 BM-MSCs 有由长梭形变为扁平状多边形的趋势,且局部细胞间连接紧密成片。BM-MSCs 诱导前不表达 CEA 和 CK19;BM-MSCs诱导后,Transwell间接共培养体系部分细胞 CEA 和 CK19表达阳性,Transwell＋诱导因子共培养体系CEA和CK19阳性细胞数明显多于 Transwell 间接共培养体系。结论：热休克汗腺细胞与 BM-MSCs 在 Tran-swell间接培养以及相关汗腺诱导因子的共培养体系下,BM-MSCs呈现向 SGCs诱导分化趋势。     

不同浓度5-溴脱氧尿嘧啶核苷标记山羊骨髓基质干细胞的体外研究

Objective To explore the feasibility of labeling and tracing in vitro goat bone marrow mesenchymal stem cells (BMSCs) by bromodeoxyuridine (BrdU) on the basis of investigation of its optimal concentration, incubating time and cytotoxicity. Methods A healthy goat, aged 10 months old, male, weighing 32 kg, was used in this study. Bone marrow was aspirated. BMSCs were isolated and cultured using the adherence method in vitro. The fourth passage of BMSCs (P4) were incubated with BrdU at 5, 10, 15, 20 μmol/L as 5, 10, 15, 20 μmol/L BMSC groups. Cells were not labeled by BrdU as negative control. The following parameters were measured: induction, differentiation and determination of goat BMSCs; the optimal mass concentration and incubation time of 5-BrdU labeling; cell positive rate at 12, 24, 48 and 72 hours in each group using immunofluoreseenee; the cell survival rate after various concentrations of BrdU ladling by trypan-blue exclusion. Results The morphology of the primary and passage goat BMSCs was fusiform in shape. Goat BMSCs could differentiate into osteoblasts and chondrocytes following induction. BMSC nucleus showed green fluorescence under fluorescence microscope after being labeled by BrdU. The mean labeling rate increased with the increase in the concentration and incubation time of BrdU, and reached to (93.32± 3.25)% after incubation in 15 μmol/L, BrdU for 48 hours. There were no significant differences between 15 μmol/L BrdU for 72 hours, 20 μmol/L BrdU for 48 hours and 72 hours (P > 0.05), or between the other groups or time points (P < 0.05). The labeling rate of the blank control group was 0. The cell survival rate was all above 90% (P > 0.05). Conclusions BrdU can be used as a labeling marker for goat BMSCs. When the concentration is 15 μmol/L and the incubation time is 48 hours, the optimal labeling effect can be achieved. Goat BMSCs labeled with BrdU is of high efficiency and safety.     

不同浓度5-溴脱氧尿嘧啶核苷标记山羊骨髓基质干细胞的体外研究

目的 利用5-溴脱氧尿嘧啶核苷(BrdU)标记山羊骨髓基质干细胞(BMSCs),检测其最佳标记浓度、时间及细胞毒性,探讨作为山羊BMSCs标记及示踪方法的可行性.方法 抽取10个月龄健康中国青山千骨髓.贴壁培养并鉴定.以浓度分别为5、10、15和20 μmol/L的BrdU标记第4代细胞,分别记为A、B、C、D组;末用BrdU标记的细胞作为卒白对照组(E组).分别标记12、24、48和72 h后,免疫荧光法检测各组标记阳性率,锥虫蓝拒染法检测标记后细胞存活率.结果 原代及传代培养的山羊BMSCs态主要为梭彤,经诱导后能向成骨细胞和软骨细胞分化.标记后,荧光显微镜下胞核呈绿色荧光.随着标记时间和浓度的增加,各实验组标记阳性率逐渐增高,于15 μmol/L孵育48 h后,其标记率可达剑(93.32±3.25)%,与15 μmol/L孵育72 h和20 μmol/L孵育48,72 h筹异无统计学意义(P>0.05),与其他各绀各时间点筹异有统计学意义(P<0.05);各时间点空白对照组标记阳性率均为均为0.锥虫蓝拒染实验示各组细胞存活率均在90%以上,差异无统计学意义(P>0.05).结论 BrdU浓度为15μmol/L,标记时间为48 h时,对山羊BMSCs可得纠最佳的标记效果,且安全性较高.