胰岛素促进脐带间充质干细胞成骨分化的作用

BACKGROUND: How to effectively and rapidly induce the osteogenic differentiation of human umbilical cord mesenchymal stem cells is the focus of the current stem cell research. Increasing evidence has demonstrated some growth factors, such as bone morphogenetic protein-2, have important effects on the transdifferentiation of umbilical cord mesenchymal stem cells into osteoblasts in vitro. However, widespread use of growth factors is limited because of high cost. Insulin is widely used in the cell culture and induction, but there is no report about the effect of insulin on the osteogenic differentiation of human umbilical cord mesenchymal stem cells. OBJECTIVE: To observe the effect of insulin on osteogenic differentiation of human umbilical cord mesenchymal stem cells and to explore the feasibility of human umbilical cord mesenchymal stem cell transplantation in the treatment of diabetic delayed fracture healing. METHODS: The passage 3 human umbilical cord mesenchymal stem cells were inoculated in two flasks, denoted as experimental group and control group. The insulin (10-7 mmol/L) was added to the experimental group but not to the control group. The proliferative capacity of human umbilical cord mesenchymal stem cells was evaluated by cell count kit-8 and alkaline phosphatase activity. The osteogenic differentiation capacity of human umbilical cord mesenchymal stem cells was evaluated by measuring the protein and mRNA expressions of type I collagen as well as osteocalcin mRNA level. RESULTS AND CONCLUSION: After 1-2 weeks of induction, compared with the control group, insulin could significantly increase the number of human umbilical cord mesenchymal stem cells in the experimental group, the activity of alkaline phosphatase and expressions of type I collagen osteocalcin mRNA (P < 0.05). These data indicate that insulin can promote the proliferation and osteogenic differentiation of human umbilical cord mesenchymal stem cells.       

miR-302对脂肪间充质干细胞向成脂和成骨分化的调控

背景：间充质干细胞具有自我更新能力,在一定条件下能够分化为一定谱系的细胞,但很多机制至今未明。 目的：探究miR-302b对脂肪间充质干细胞向成脂和成骨分化的调控作用。 方法：miR-302模拟物转染作用于脂肪间充质干细胞进行成骨成脂诱导,对照组转染miR-302阴性对照模拟物miR-NC。采用碱性磷酸酶染色及活性分析、茜素红染色、油红O染色和萃取实验观察miR-302上调对脂肪间充质干细胞成骨和成脂分化的影响,以及Western blot检测miR-302上调后成骨分化转录因子Runx2和成骨早期标志物碱性磷酸酶在脂肪间充质干细胞中的表达。 结果与结论：①碱性磷酸酶沉淀物在miR-302过表达细胞中产生的量均明显少于对照组,进一步发现miR-302过表达实验组碱性磷酸酶活性明显低于对照组(P < 0.05)。②miR-302过表达明显抑制了矿物质沉积钙结节的形成,miR-302上调实验组橘红色的钙结节明显少于对照组。③miR-302过表达实验组油红O染色阳性的细胞数明显高于对照组,进一步表明实验组细胞萃取得到的油红O吸光度值明显上升(P < 0.05)。④成骨诱导第6天时成骨分化转录因子Runx2和成骨早期标志物碱性磷酸酶在miR-302过表达的细胞中都有不同程度的下降。⑤以上结果表明miR-302的上调能够抑制脂肪间充质干细胞的成骨分化,同时促进其向成脂分化。miR-302在间充质干细胞向成脂和成骨分化平衡发挥了双向调控作用。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     

杜仲诱导骨髓间充质干细胞成骨分化的有效部位

背景：体外细胞培养实验发现,杜仲能够诱导骨髓间充质干细胞成骨分化。 目的：分离确认杜仲诱导骨髓间充质干细胞成骨分化的有效部位。 方法：体外培养SD大鼠骨髓间充质干细胞。提取分离杜仲有效部位,杜仲粉末经体积分数60%乙醇提取,再用半制备高效液相色谱仪法收集6个组分,编号为B2.1.1、B2.1.2、B2.1.3、B2.1.4、B2.1.5、B2.1.6。取第3代骨髓间充质干细胞,加入不同浓度的杜仲分离物,诱导培养6 d,同时设非诱导对照。荧光定量 PCR法测定成骨分化标记物碱性磷酸酶的表达变化。 结果与结论：在高效液相色谱仪分离的6个组分中,B2.1.1和B2.1.3两个组分具有显著刺激骨髓间充质干细胞成骨分化标志基因碱性磷酸酶表达的作用,与非诱导对照相比,其表达分别达到3.73和4.74倍。实验初步分离了杜仲诱导骨髓间充质干细胞成骨分化有效部位,为最终分离和确认有效物质的化学成分提供了资料。     

镁黄长石浸提液诱导多潜能干细胞的成骨分化

背景：镁黄长石属于硅酸盐生物活性陶瓷,在生物体内具有降解作用,降解溶出的离子产物能够诱导细胞成骨分化,是组织工程骨支架材料的良好选择。目的：通过研究不同浓度的镁黄长石浸提液对诱导性多潜能干细胞增殖和成骨分化的影响,确定镁黄长石浸提液促进诱导性多潜能干细胞成骨分化的最佳浓度。方法：将诱导性多潜能干细胞培养于不同浓度的镁黄长石浸提液中,用MTT法检测细胞的增殖情况;在第7,14,21天时,分别收集培养上清液,检测其中碱性磷酸酶、骨钙素、Ⅰ型胶原蛋白含量。结果与结论：镁黄长石浸提液促进诱导性多潜能干细胞增殖的作用具有时间依赖性,第3天时,诱导性多潜能干细胞增殖明显,第5天与第3天相比差异无显著性意义,至第7天时则明显减弱。同时,1/4浓度浸提液组促进诱导性多潜能干细胞增殖作用最强。作为细胞成骨分化标志的碱性磷酸酶和骨钙素含量随时间增加而增加,1/4浸提液浓度组含量最高。作为细胞成骨分化早中期标志的Ⅰ型胶原蛋白在第7天时各组均未检出,第14,21天时,同样是1/4浓度浸提液组含量最高,这些说明镁黄长石浸提液中的Ca、Mg、Si离子参与了诱导性多潜能干细胞的成骨分化,其中1/4浓度浸提液(Ca离子2.37 mmol/L、Mg离子1.12 mmol/L、Si离子1.05 mmol/L)促进诱导性多潜能干细胞体外成骨分化的效果最好。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;组织工程全文链接：     

体外诱导骨髓与脐血间充质干细胞向成骨细胞分化及其成骨活性的比较

背景：脐血与骨髓来源的间充质干细胞在一定诱导条件作用下均具有多向分化的能力。 目的：比较脐血与骨髓来源间充质干细胞向成骨细胞诱导分化能力的差异。 方法：采用密度梯度法分离培养人脐血间充质干细胞和骨髓间充质干细胞,当细胞汇合90%后胰蛋白酶消化传代,取第3代脐血间充质干细胞和骨髓间充质干细胞,以细胞密度为8×10⁴/孔接种,当细胞达80%融合时,加入含体积分数为10%胎牛血清、0.1 μmol/L地塞米松、50 μmol/L维生素C、10 mmol/L β-甘油磷酸钠的低糖型DMEM成骨细胞诱导液培养。 结果与结论：两种来源间充质干细胞的形态和生物学特性无明显差异,细胞表面均强表达CD44,CD29,不表达CD34;两者均具有向成骨细胞诱导分化的潜能,稳定表达了成骨细胞标志性的产物碱性磷酸酶、骨矿化结节,而且两种细胞的成骨活性差异无显著性意义。结果表明脐血和成人骨髓来源间充质干细胞向成骨细胞诱导分化能力相似,均可作为骨组织工程的种子细胞。     

微重力对骨髓间充质干细胞成骨分化的影响

骨髓间充质干细胞（BMSCs）是一种多能成体于细胞,是组织工程重要的种子细胞来源之一.微重力对BMSCs成骨分化具有抑制作用,可使骨量减少和骨微结构改变,从而导致骨质疏松症.这一过程受到多条信号通路的调控,如MAPK信号通路、Notch信号通路和Wnt/β-catenin信号通路等,它们协同调节微重力下BMSCs向成骨细胞方向的分化.研究微重力对BMSCs成骨分化的影响,可以阐明骨质流失机理,为相关疾病的治疗提供新的靶点,促进我国太空宇航事业的发展.     

脂肪来源干细胞向成骨分化及褪黑素干预细胞生物学活性的变化

背景：研究表明褪黑素能促进脂肪来源干细胞向神经元转化,但对脂肪来源干细胞成骨分化后细胞的作用报道较少。 目的：观察脂肪来源干细胞向成骨分化及褪黑素对成骨分化后细胞生物学活性的影响。 方法：①取昆明种小鼠附睾处脂肪利用Ⅰ型胶原酶消化法和差速贴壁法获取、纯化脂肪来源干细胞,应用CD44免疫组化染色对细胞进行鉴定。②取第2代脂肪来源干细胞,加入成骨诱导培养基培养,行碱性磷酸酶染色和von Kossa法检测细胞分化情况。③取成骨诱导后的细胞,加入不同浓度的褪黑素,利用MTT法检测24,48 h时细胞增殖情况。④取成骨诱导后的细胞,加入最佳浓度的褪黑素,分别检测加入药物3,6 d时的碱性磷酸酶活性。 结果与结论：①接种48 h后大多数细胞贴壁,接种后4 d细胞呈现多种细胞形态,并形成大小不一的细胞集落,传代后的细胞形态趋于稳定,均称长梭型,培养细胞CD44呈阳性表达,阳性颗粒位于胞膜,呈棕黄色。②成骨诱导后的细胞应用von Kossa法染色呈阳性,黑色沉积物在细胞外的基质中呈网格状分布;碱性磷酸酶染色呈阳性,细胞内可见棕黑色颗粒。③在24 h和48 h时间点,1,10,100 μmol/L组的吸光度值明显大于空白组(P < 0.05),选择这3个浓度作为最佳的褪黑素浓度。④各组成骨诱导后细胞内碱性磷酸酶活性随时间延长明显增加,差异有显著性意义(P < 0.05)。褪黑素组(1,10,100 μmol/L)在3 d时的碱性磷酸酶活性与空白组相比无明显差异(P > 0.05),在6 d时较空白组明显增加(P < 0.05)。提示褪黑素可以增强脂肪来源干细胞成骨分化后细胞增殖,并提高细胞内碱性磷酸酶活性。 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     

人参皂苷Rb1对体外培养人脂肪干细胞增殖与成骨分化的影响

背景：脂肪干细胞成骨分化受多种因素的影响,中药成骨诱导活性因子在脂肪干细胞研究中有重要意义。 目的：观察人参皂苷Rb1在体外培养条件下对人脂肪干细胞增殖和成骨分化的影响。 方法：体外分离培养人脂肪干细胞,传至第3代后,按2×10³/孔接种至96孔板,分别加入0.5,1.0,2.0,4.0,6.0 μmol/L人参皂苷Rb1培养基200 μL进行培养;设立对照组,仅加入等量普通DMEM培养基。采用XTT比色法测定大鼠脂肪干细胞的生长增殖曲线。通过碱性磷酸酶试剂盒测定细胞碱性磷酸酶活性,放射免疫法检测骨钙素含量,茜素红染色观察钙化结节形成能力。 结果与结论：0.5 μmol/L人参皂苷Rb1可明显促进人脂肪干细胞增殖;随着人参皂苷Rb1浓度的增加,促细胞增殖活性降低,6.0 μmol/L人参皂苷Rb1表现为明显的抑制细胞增殖作用。人参皂苷Rb1呈剂量依赖性促进人脂肪干细胞碱性磷酸酶活性和骨钙素表达。4.0,6.0 μmol/L人参皂苷Rb1诱导钙化结节形成能力优于0.5,1.0和2.0 μmol/L人参皂苷Rb1,对照组人脂肪干细胞未见钙化结节形成。提示人参皂苷Rb1在一定浓度范围内对体外培养条件下的人脂肪干细胞具有促生长增殖作用,但在高浓度时,人参皂苷Rb1对人脂肪干细胞的成骨分化具有促进作用,因此可作为一种良好的成骨诱导活性因子。     

骨髓间充质干细胞成骨分化调控的研究进展

骨髓间充质干细胞具有较强的自我更新能力和多向分化潜能，其应用是目前国际上组织工程领域中重要的研究内容之一。近年来，许多实验室从分子，生化，物理等水平对其成骨分化调控进行了深入研究，取得了较大的进展。     

炎症与正常牙周膜来源牙周膜干细胞的成骨分化能力和自噬水平

背景：炎症影响牙周膜干细胞的成骨分化,同时牙周膜干细胞的成骨能力与自噬水平密切相关,但是炎症是否影响牙周膜干细胞成骨分化不同阶段的成骨能力与自噬水平尚未见相关报道。目的：探讨牙周膜干细胞在牙周炎和正常状态下的碱性磷酸酶表达和自噬水平。方法：分离培养健康人群与牙周炎患者的牙周膜干细胞,进行Vimentin、pan-CK和Stro-1荧光染色。正常和炎症牙周膜干细胞成骨分化3,7,14d时,Westernblot检测碱性磷酸酶、LC3B、Beclin1、ATG5的蛋白表达,real-time PCR检测碱性磷酸酶、骨唾液蛋白、骨钙素、Runx2、LC3B、Beclin1、ATG5的mRNA表达。结果与结论：(1)牙周膜干细胞内Stro-1阳性表达,Vimentin阳性表达,pan-CK阴性表达;(2)成骨分化3,7,14 d,与正常牙周膜干细胞相比,炎症牙周膜干细胞所形成的矿化结节明显减少(P <0.01),碱性磷酸酶的蛋白和mRNA表达明显降低(P <0.05),骨唾液蛋白、骨钙素、Runx2的mRNA表达明显降低(P <0.05);(3)成骨分化7,14 d,与正常牙...     

中空多孔金属假体复合诱导因子对骨髓间充质干细胞生长及成骨分化的影响

BACKGROUND: Bone morphogenetic protein in combination with hollow porous titanium alloy can improve the affinity with surrounding bone tissues.     

骨形态发生蛋白9体外诱导牙囊细胞的成骨分化

背景：有研究表明骨形态发生蛋白9能促进多种干细胞的成骨分化,但其是否具有诱导牙囊细胞成骨向分化的能力尚不清楚。目的：探讨骨形态发生蛋白9对大鼠牙囊细胞成骨分化的诱导作用。方法：以纯化的第3代大鼠牙囊细胞为研究对象,感染骨形态发生蛋白9腺病毒后,检测牙囊细胞中碱性磷酸酶活性、钙盐沉积以及矿化相关因子基因和蛋白的表达变化。结果与结论：感染骨形态发生蛋白9的牙囊细胞碱性磷酸酶活性持续增强,钙盐沉积明显增强。Real time PCR检测结果显示感染骨形态发生蛋白9的牙囊细胞中矿化相关因子碱性磷酸酶、骨钙素、骨涎蛋白、骨桥蛋白和核心结合因子mRNA表达增强。Western blot检测结果显示感染骨形态发生蛋白9的牙囊细胞中骨桥蛋白的表达增强。以上结果表明骨形态发生蛋白9可诱导牙囊细胞向成骨方向分化。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;组织工程全文链接：     

辛伐他汀对骨髓基质干细胞特异性成骨分化基因表达的影响

文章快速阅读： 文题释义： 骨形态发生蛋白：是转化生长因子超家族成员之一,其中骨形态发生蛋白2是公认的骨髓基质干细胞成骨分化的关键蛋白,不仅可以促进成骨细胞及其前体细胞的增殖,而且能够促进成骨细胞的分化,是骨髓基质干细胞成骨分化中晚期表达的特异性标志蛋白,国外首次发现辛伐他汀的成骨潜能即是通过筛选发现辛伐他汀可以刺激骨形态发生蛋白2启动子活性。 Ⅰ型胶原：由成骨细胞以原胶原的形式分泌,在骨骼与结缔组织中通过形成和保持骨架的完整性来发挥作用,在形成特定的细胞外微环境中也起到主要作用,而这些微环境对于维持细胞的完整性及传递细胞外信号起到关键作用。摘要 背景：以往研究表明降脂类药物辛伐他汀具有促进体外培养骨髓基质干细胞向成骨细胞分化的潜能,有望成为新型促成骨类药物,但干预不同时间点相应特异性成骨分化基因的表达是否有差异尚不得而知。 目的：观察辛伐他汀体外刺激不同时间点大鼠骨髓基质干细胞骨形态发生蛋白2和Ⅰ型胶原的表达。 方法：取第1代骨髓基质干细胞分为两组,对照组加入成骨诱导培养基培养,辛伐他汀组在对照组基础上加入终浓度为10-7 mol/L的辛伐他汀培养,干预第7天检测第3代细胞碱性磷酸酶的表达。取第4代骨髓基质干细胞分为两组,对照组加入成骨诱导培养基培养,辛伐他汀组在对照组基础上加入终浓度为10-7 mol/L的辛伐他汀培养,干预12 h和36 h提取细胞RNA及蛋白,采用Realtime PCR 和Western blot 法检测骨形态发生蛋白2和Ⅰ型胶原的表达。 结果与结论：①两组细胞均有碱性磷酸酶分泌,辛伐他汀组大鼠碱性磷酸酶阳性细胞比例显著高于对照组(P < 0.05);②辛伐他汀组2个时间点骨形态发生蛋白2和Ⅰ型胶原mRNA表达均显著高于对照组 (P < 0.05);③Western blot 法检测辛伐他汀组2个时间点骨形态发生蛋白2的表达均显著高于对照组(P < 0.05);辛伐他汀组Ⅰ型胶原蛋白的表达于12 h显著高于对照组(P < 0.05),36 h无显著差别;④以上结果提示,辛伐他汀可以促进大鼠骨髓基质干细胞向成骨细胞分化晚期特异性标志蛋白骨形态发生蛋白2和Ⅰ型胶原的表达,药物刺激12 h较36 h作用更显著。 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 ORCID: 0000-0001-7083-3380(田发明)     

温阳益气法对肿瘤微环境中骨髓间充质干细胞炎性平衡及遗传稳定性的调控

背景：骨髓间充质干细胞在癌性微环境中的遗传稳定性问题如何进一步明确并加以有效预防,日益成为推广其临床应用的关键问题。非可控性炎症和肿瘤之间存在互为因果现象,越来越受到科学界关注。 目的：分析骨髓间质干细胞在肿瘤微环境中的炎性信号通路及遗传稳定性的变化,并基于中医学温阳固肾、益气升阳、扶正祛邪理论为指导,探讨温阳益气法提高骨髓间质干细胞在肿瘤相关炎性微环境中的效应及其作用机制。 方法：以“骨髓间充质干细胞,炎性平衡,补肾,温阳,益气,升阳,肿瘤,癌,阳化气,阴成形,遗传稳定性”为中文检索词,以“bone marrow mesenchymal stem cells, inflammatory balance, replenishing qi, warming yang, strengthening shen, elevate yang, tumor, cancer,  yang can transform qi, yin shaping up body, genetic stability”为英文检索词,应用计算机检索中国知网CNKI数据库、维普和PubMed数据库,严格按纳入标准、排除标准进行文献质量评估和筛选,最终选择42篇文献进行综合分析。 结果与结论：在理化因素诱导或肿瘤微环境中,骨髓间充质干细胞可促进肿瘤增殖、侵袭转移,另外骨髓间充质干细胞自身也可被诱发转化为肿瘤相关纤维母细胞,发生遗传稳定性改变。炎性微环境及其骨髓间充质干细胞炎性信号通路异常在骨髓间充质干细胞的遗传稳定性改变中发挥重要作用,基于中医学温阳固肾、益气升阳、扶正祛邪理论,发现温阳益气类中药可明显提高肿瘤微环境及化学癌环境中骨髓间充质干细胞的遗传稳定性。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;组织工程全文链接：     

在5-杂氮胞苷诱导下人脐带间充质干细胞生物活性特性及向心肌样细胞的分化

BACKGROUND: Human umbilical cord mesenchymal stem cells belong to a special class of stem cells with a limited number, which are difficult to isolate and purify. Importantly, there is a lack of clinical understanding of biological characteristics of human umbilical cord mesenchymal stem cells.     

人脐血干细胞分化为鼻黏膜纤毛上皮细胞

BACKGROUND:Damage to nasal ciliated epithelial cells can lead to a severe injury in nasal biological function. Compared with other adult stem cells, human umbilical cord blood stem cells have better differentiation potential. OBJECTIVE:To explore the feasibility of human umbilical cord blood stem cells differentiating into nasal ciliated epithelial cells through in vitro culture and induction techniques. METHODS: Normal and healthy umbilical cord blood samples were collected to isolate human umbilical cord blood stem cells, followed by identification and subculture in vitro. Umbilical cord blood stem cells at passage 3 were infected with recombinant adeno-associated virus carrying enhanced green fluorescent protein and cultured using air liquid interface culture method. Thereafter, PCR assay was employed for detecting MUCS expression in cultured stem cells at 1 and 2 weeks after induction, and immunofluorescent staining for FOXJ1 was performed at 3 weeks. RESULTS AND CONCLUSION:After subculture, passage 3 umbilical cord blood stem cells that could express stem cell surface markers were visible in a uniform shape and had good refraction. After 3 hours of gene transfection, green fluorescence issued from the passage 3 cells were visible, and the cell positive rate was up to 96.2% until 48 hours, indicating good transfection efficiency. RT-PCR findings showed that MUC8 mRNA had no expression in the umbilical cord blood stem cells, but expressed strongly in the nasal ciliated epithelial cells, whose expression was weak at 1 week of culture and increased at 2 weeks. Additionally, the positive expression of FOXJ1 red fluorescence was observed under the transfection of green fluorescent protein. These results suggest that human umbilical cord blood stem cells could differentiate into nasal epithelial cells under suitable conditions.     

miR-195对人骨髓间充质干细胞成骨分化的影响

BACKGROUND:Previous studies have found that the expression level of miR-195 in differentiated human bone marrow mesenchymal stem cells (hBMMSCs) is significantly higher than that in undifferentiated hBMMSCs. However, miR-195 effect during this differentiation process and possible mechanism remain unclear. OBJECTIVE:To explore the effect of miR-195 on osteogenic differentiation of hBMMSCs and possible mechanism. METHODS:hBMMSCs were isolated and cultured in vitro. Alkaline phosphatase activity, Runx2, osteopontin and SMAD7 protein expression and miR-195 expression level during osteogenic differentiation of hBMMSCs were determined by alkaline phosphatase kit, western blot and real-time PCR, respectively. miR-195-downexpressed hBMMSCs were constructed by lipofection transfection, and were used to investigate the effect of miR-195 was on osteogenic differentiation of hBMMSCs. Dual luciferase reporter assay was used to identify whether the 3’UTR of SMAD7 mRNA was a binding target of miR-195. In addition, we transfected hBMMSCs with SMAD7 cDNA (pcDNA-SMAD7), and investigated the effect of SMAD7 on osteogenic differentiation of hBMMSCs. RESULTS AND CONCLUSION:The isolated and cultured hBMMSCs had good osteogenic differentiation ability in vitro. Expression level of miR-195 was increased with the increasing of induction time, and the expression level of SMAD7 was reversed. miR-195 promoted osteogenic differentiation of hBMMSCs. Luciferase assay confirmed that miR-195 targeted SMAD7 directly, and overexpression of SMAD7 inhibited the osteogenic differentiation of hBMMSCs. Taken together, miR-195 promotes osteogenic differentiation of hBMMSCs by targeting SMAD7.     

腺病毒携带骨形态发生蛋白14基因转染脂肪干细胞修复损伤关节软骨

背景：关节软骨损伤后自我修复能力较弱,主要是由于其缺乏滋养血管并且细胞代谢缓慢等组织特性,目前的治疗方法都不能恢复软骨组织的原有功能,近年来软骨组织工程已引起了越来越多的关注。 目的：观察Ⅰ型胶原海绵支架搭载骨形态发生蛋白14基因转染脂肪干细胞修复兔膝关节软骨损伤的效果。 方法：取兔皮下脂肪组织分离培养脂肪干细胞,用腺病毒真核表达载体Ad-CMV-BMP-14-IRES-hrGFP-1转染脂肪干细胞。Ⅰ型胶原海绵支架搭载转染后的脂肪干细胞,待细胞吸附后对兔膝关节全层软骨缺损进行修复。术后12周取手术关节,从大体方面、组织学方面综合评估缺损修复状况。 结果与结论：骨形态发生蛋白14转染后的脂肪干细胞骨形态发生蛋白14和Ⅱ型胶原蛋白表达及Sox-9基因表达明显高于普通脂肪干细胞。术后12周,支架搭载经骨形态发生蛋白14转染的脂肪干细胞组软骨组织修复良好,平整光滑,光洁度、质地及颜色良好,交界区整合良好。支架搭载脂肪干细胞组软骨组织部分修复,有正常软骨光泽,质地与颜色接近正常,修复组织与正常软骨组织界限明显。单纯支架组几乎崩解塌陷,未见透明样软骨结构形成。结果可见腺病毒携带骨形态发生蛋白14基因转染后脂肪干细胞修复软骨缺损的能力有大幅提升。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;组织工程全文链接：     

归芪地黄汤干预对耳蜗干细胞治疗感音性耳聋的影响

BACKGROUND:Combining Chinese medicine with stem cell transplantation opens up a new avenue for the use of traditional Chinese medicine in the stem cell transplantation. It is expected to improve survival and differentiation of cochlear stem cells into hair cells through Chinese medicine interventions. OBJECTIVE:To observe the influence of Guiqi Dihuang Tang on the treatment of sensorineural deafness with cochlear stem cells. METHODS:Guinea pigs with sensorineural deafness were randomly assigned into three groups: combined group intervened with cochlear stem cell suspension with medicated serum, cell transplantation group with cochlear stem cell suspension, and blank control group with normal saline injection. At 7, 28 and 56 days after treatment, all guinea pigs were detected for auditory brainstem response and immunofluorescent observation. RESULTS AND CONCLUSION:Nestin positive cells and MyosinVIIA positive cells were observed in the combined and cell transplantation groups, and the number of positive cells was higher in the combined group than the cell transplantation group. Auditory brainstem response threshold of guinea pigs was decreased in the combined and cell transplantation groups, and the recovery of hearing was better in the former group. These findings indicate that the intervention of Guiqi Dihuang Tang can remarkably improve the survival rate of transplanted stem cells and the differentiation ratio of transplanted cells into hair cells.     

淫羊藿苷促进间充质干细胞成骨分化：为治疗骨缺损提供一个良好的方向

BACKGROUND:Recent studies have shown that icariin is a good bone-inducing factor that can promote the osteogenic differentiation of mesenchymal stem cells, providing a new hope for the treatment of bone defects. OBJECTIVE:To review research achievements in pharmacological effects of icariin effects on bone tissue metabolism as well as its effect to promote osteogenic differentiation of mesenchymal stem cells. METHODS:The first author retrieved CNKI and PubMed databases for relevant Chinese and English literatures using keywords of “icariin, stem cell, osteogenesis”, respectively. Articles regarding icariin, stem cells, osteogenesis were included, and repetitive studies were excluded. Totally 754 articles were retrieved initially. In accordance with inclusion and exclusion criteria, 41 articles were included in result analysis. RESULTS AND CONCLUSION:As the main ingredient of Herba epimedii, icariin functions as a good osteogenetic growth factor to promote the osteogenic differentiation of bone marrow mesenchymal stem cells. In recent years, icariin has been shown to promote adipose-, umbilical cord-, and periodontal ligament tissue-derived mesenchymal stem cells to differentiate into osteoblasts. But such studies are less reported. Until now, mesenchymal stem cells still exhibit unsatisfactory osteogenic ability in in vivo experiments. Given this, osteogenetic growth factors contribute to the osteogenic differentiation of mesenchymal stem cells. Therefore, the use of icariin is expected to provide a good strategy for bone defect repair.