大鼠骨髓基质干细胞分离培养及向成骨、成脂诱导分化的研究

目的利用细胞原代及传代培养技术将大鼠骨髓基质干细胞诱导分化为成骨细胞和脂肪细胞,为其进一步应用奠定基础.方法全骨髓法分离大鼠骨髓基质干细胞,传代后分别在成骨、成脂诱导条件下继续培养,采用碱性磷酸酶染色、茜素红染色及油红"O"染色观察其成骨及成脂分化结果.结果第2代大鼠骨髓基质干细胞成骨诱导9 d后碱性磷酸酶染色呈阳性细胞,连续诱导14 d后可见矿化结节形成,成脂诱导14 d后可见脂肪细胞形成.结论随着诱导条件的不同,大鼠骨髓基质干细胞在体外可定向分化为成骨细胞和脂肪细胞.     

Ι型骨质疏松山羊骨髓基质细胞体外成脂、成骨分化的研究

观察体外定向诱导Ι型骨质疏松山羊骨髓基质细胞(BMSCs)分化为脂肪细胞和成骨细胞。建立去卵巢骨质疏松山羊动物模型,全骨髓法分离培养其骨髓基质细胞。第二代细胞分别成脂、成骨诱导培养,油红O染色、碱性磷酸酶染色、茜素红染色判定其分化结果。成脂诱导21d,油红O染色有脂滴形成;成骨诱导14d,碱性磷酸酶染色阳性;连续诱导35d,茜素红染色证实有钙化结节形成。Ι型骨质疏松山羊骨髓基质细胞在体外可以定向诱导分化为脂肪细胞和成骨细胞。     

Ⅰ型骨质疏松山羊骨髓基质细胞体外成脂、成骨分化的研究

观察体外定向诱导Ⅰ型骨质疏松山羊骨髓基质细胞（BMSCs）分化为脂肪细胞和成骨细胞.建立去卵巢骨质疏松山羊动物模型,全骨髓法分离培养其骨髓基质细胞.第二代细胞分别成脂、成骨诱导培养,油红O染色、碱性磷酸酶染色、茜素红染色判定其分化结果.成脂诱导21 d,油红O染色有脂滴形成;成骨诱导14 d,碱性磷酸酶染色阳性;连续诱导35 d,茜素红染色证实有钙化结节形成.Ⅰ型骨质疏松山羊骨髓基质细胞在体外可以定向诱导分化为脂肪细胞和成骨细胞.     

大鼠骨髓间充质干细胞向脂肪细胞、成骨细胞诱导分化及破骨细胞培养方法的建立

为建立稳定的大鼠骨髓间充质干细胞向脂肪细胞、成骨细胞诱导分化及破骨细胞培养的方法,为后续细胞共培养奠定实验基础。采用通过全骨髓贴壁法体外分离、培养、纯化大鼠骨髓间充质干细胞的方法,进行形态学观察,并应用流式细胞术检测BMSCs免疫学表型,对其进行鉴定;将获得的第三代BMSCs向脂肪细胞和成骨细胞方向进行诱导分化,诱导21 d后的脂肪细胞应用油红O染色进行鉴定,成骨细胞应用茜素红染色进行鉴定;将获取的骨髓细胞液按照造血系单核干细胞诱导培养法向破骨细胞方向进行诱导分化,于28 d后进行抗酒石酸酸性磷酸酶染色进行鉴定。结果显示,BMSCs体外培养14 d具有独特的细胞免疫学表型,流式细胞术检测,CD29+、CD44+表达量分别为97.92%和89.32%;在脂肪培养基诱导下,油红O染色阳性。在成骨培养基诱导下,茜素红染色阳性;骨髓细胞液在破骨培养基诱导下,抗酒石酸酸性磷酸酶染色阳性。由此可知,建立了稳定的大鼠骨髓间充质干细胞向脂肪细胞、成骨细胞诱导分化及破骨细胞诱导分化的培养方法。     

体外培养大鼠颅骨成骨细胞的生物学特性

应用机械和多步酶解的方法，从新生大鼠颅骨分离成骨细胞。偶氮染色法和钙钴法证明细胞的碱性磷酸酶活性呈阳性反应；Ｖｏｎ Ｋｏｓｓａ和钙分子探针Ｆｌｕｏ－３染色显示细胞节内有钙的沉积；电镜和倒置相差显微镜观察可见矿化结节及其形成过程；碱性磷酸酶性活性和骨钙素的动态分析提示这两种蛋白因子与成骨细胞分化与成熟的相关性。这一体外培养方法的建立，为骨的发育和成骨细胞生物学的研究提供了模型。     

大鼠骨髓间充质干细胞的分离及分化潜能鉴定

用全骨髓贴壁法从SD大鼠骨髓中分离骨髓间充质干细胞(bone marrow-derived mesenchymal stem cells,BM-MSCs)。为鉴定其成骨分化潜能,将大鼠BM-MSCs进行成骨诱导培养,第7天用碱性磷酸酶染色显示有碱性磷酸酶阳性细胞,第21天进行茜素红染色有矿化骨节形成。为鉴定其成脂分化潜能,将大鼠BM-MSCs先在成脂诱导培养基中培养,再换为在成脂肪维持培养基中培养,第10天进行油红O染色有脂滴形成。表明从SD大鼠骨髓中成功分离得到具有多向分化潜能的大鼠BM-MSCs,为其作为种子细胞应用于临床或研究奠定基础。     

脐带源间充质干细胞的生物学性状及其成脂肪细胞诱导分化

以健康产妇脐带为材料分离脐带间充质干细胞,体外培养扩增传代,做细胞形态观察,计数细胞并绘制细胞生长曲线,用流式细胞仪测定细胞周期以及免疫表型,测定细胞定向诱导分化成脂肪细胞的能力.发现人脐带源间充质干细胞能在体外培养扩增,可定向诱导分化为脂肪细胞并且具有和骨髓来源的间充质干细胞相似的生物学形态和抗原表型.成功建立了脐带源间充质干细胞系,可以作为干细胞研究和应用的新的材料来源.     

体外诱导大鼠骨髓间充质干细胞表达酪氨酸羟化酶

目的:探讨体外诱导大鼠骨髓间充质干细胞(mesenchymal stem cells,MSCs)表达酪氨酸羟化酶,为帕金森病细胞移植替代治疗提供特异性分化的细胞.方法:在无菌条件下从SD大鼠的股骨中分离骨髓间充质干细胞,体外培养传3代后,用表皮生长因子、碱性成纤维细胞生长因子和抗坏血酸诱导MSCs 表达酪氨酸羟化酶.在镜下,观察MSCs 在诱导前后的形态变化;用免疫荧光染色检测酪氨酸羟化酶的表达.结果:MSCs经诱导分化后,胞体逐渐变圆,并伸出神经轴突、树突样突起;免疫荧光化学表明细胞酪氨酸羟化酶染色呈强阳性反应.结论: SD大鼠骨髓间充质干细胞在体外能被定向诱导表达酪氨酸羟化酶,有可能为帕金森病治疗提供特异性分化的细胞.     

大豆苷元对体外培养大鼠成骨细胞增殖与分化的影响

目的探讨大豆苷元对体外培养大鼠成骨细胞的增殖与分化能力的影响.方法从新生大鼠颅骨中分离培养大鼠成骨细胞,加入不同浓度的大豆苷元溶液进行培养,48,72 h后用MTT法测定成骨细胞的增殖,PNPP法测定碱性磷酸酶活性及RIA法测定骨钙素含量.结果不同浓度的大豆苷元作用48,72 h后,测定OD值均高于阴性对照组;成骨细胞在大豆苷元的作用下,与阴性对照相比,碱性磷酸酶活性显著增高;成骨细胞BGP含量显著增加.结论大豆苷元具有促进体外大鼠成骨细胞的增殖以及分化的作用.     

骨碎补有效成分柚皮甙对人骨髓间充质干细胞的影响

目的探讨骨碎补的有效成分枘皮甙对人骨髓间充质于细胞（hMSCs）增殖、分化的影响。方法将骨碎补的有效成分柚皮甙以及成骨诱导液（地塞米松、维生素C、β-甘油磷酸钠）与hMSCs共同体外培养，用倒置显微镜观察细胞生长情况、CCK-8法检测细胞的毒性和增殖作用、碱性磷酸酶（ALP）活性测定、von kossa钙结节染色。结果50μg／L柚皮甙对细胞无毒性、能促进hMSCs增殖，碱性磷酸酶（ALP）活性、von kossa钙结节染色与卒白对照组比较有明硅差异（P〈0．05）。结论柚皮甙对hMSCs有保护作用并能促进其增殖、分化。     

Effects of genistein, daidzein and glycitein on the osteogenic and adipogenic differentiation of bone marrow stromal cells and on the adipogenic trans-differentiation of osteoblasts

The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT), alkaline phosphatase (ALP) activity and oil red O assays were used to examine the effects of genistein, daidzein and glycitein on the osteogenic and adipogenic differentiation of primary mouse bone marrow stromal cells (MSCs) and the adipogenic trans-differentiation of primary mouse osteoblasts. The results indicated that daidzein, genistein and glycitein at concentrations from 1×10^-8 mol/L to 1×10^-5 mol/L promoted the proliferation of MSCs and osteoblasts; genistein, daidzein and glycitein promoted osteogenic differentiation and inhibited adipogenic differentiation of MSCs, and inhibited adipocytic transdifferentiation of osteoblasts at appropriate concentrations as 17β-estradiol. It suggests that genistein, daidzein and glycitein regulate a dual differentiational process of MSCs into the osteogenic and adipogenic lineages, and trans-differentiational process of primary osteoblasts into the adipocyte lineages, causing a lineage shift toward osteoblast. Protective effects of them on bone may be mediated by a reversal of adipogenesis which may promote the proliferation, differentiation and mineralization of osteoblasts, and make adipocytes secrete less cytokines which may promote osteoclast formation and activation. In addition, the results also indicated that genistein, daidzein and glycitein may be helpful in preventing the development of steroid induced osteonecrosis.     

Notch signaling stimulates osteogenic differentiation of human bone marrow-derived mesenchymal stem cells

Notch signaling is one of the most important pathways mediating cell determination and differentiation.In this study, the roles of Notch signal in the regulation of osteogenic differentiation of human bone marrow mesenchymal stem cells (hMSCs) were investigated. The expression of Notch1, Jaggedl and DTXI detected by reverse transcrip-tion polymerase chain reaction (RT-PCR) suggested that Notch signal might exhibit a physiological regulatory role in the differentiation of MSCs. Constitutive expression of the intracellular domain of Notchl (ICN), the active form of Notchl protein, can activate Notch signal in cells without ligands‘ binding, hMSCs were isolated, expanded, and infected with retrovirus carrying green fluorescent protein (GFP) gene or ICN. Overexpression of ICN in hMSCs resulted in enhanced osteogenic differentiation induced by dexamethasone (Dex), which was characterized by an increase of cellular alkaline phosphatase (ALP) activity and calcium deposition. These results indicate that Notch stimulates differentiation of MSCs into osteoblasts.     

人骨髓间充质干细胞对小鼠神经干细胞增殖与分化培养的影响

通过在体外培养、鉴定人的骨髓间充质干细胞与小鼠神经干细胞,用骨髓间充质干细胞条件培养基分别在增殖与分化条件下对神经干细胞进行培养.发现,间充质干细胞条件培养基在增殖条件下能加快神经球内神经干细胞的迁移,使神经球解聚,对神经干细胞增殖没有影响;而间充质干细胞条件培养基在分化条件下,能增加神经干细胞向少突胶质细胞分化的能力,降低向星型胶质细胞的分化能力,对向神经元分化能力没有影响,间充质干细胞可能是通过促进神经干细胞迁移、分化而加快神经损伤的修复的.     

Effect of La^3＋ on osteoblastic differentiation of rat bone marrow stromal cells

Lanthanides are increasingly used in industry and agriculture in recent years. These applications increase the accumulation of lanthanides in the human body, especially in bone[1]. Thus, people paid extensive atten-tion to the effect of lanthanides on bon…     

26-失碳-8-氧代-α-芒柄花萜醇对体外培养成骨细胞活性的影响

为研究玉柏石松提取物26-失碳-8-氧代-α-芒柄花萜醇(26-NO-Ono)对成骨细胞活性的影响,采用MTT检测不同浓度26-NO-Ono(3.33,6.66,13.32,26.64μmol/L)对成骨细胞增殖率,碱性磷酸酶(ALP)试剂盒检测成骨细胞内ALP活性,荧光定量PCR检测成骨细胞骨相关基因表达.结果表明:26-NO-Ono给药1d可促进成骨细胞增殖,给药3d可促进成骨细胞ALP活性.26-NO-Ono处理3d和9d会抑制骨涎蛋白(BSP)、I型胶原蛋白(Col-I)以及骨钙素蛋白(OCN)的基因表达;处理6d会促进上述基因的表达.26-NO-Ono长期处理(6d和9d)可以抑制骨桥蛋白(OPN)的基因表达,说明26-NO-Ono对成骨细胞的成骨活性的影响呈时间依赖性,剂量依赖性和细胞分化状态依赖性.     

PLGA多孔支架降解与成骨细胞相互作用的影响

研究聚丙交酯-乙交酯(PLGA)多孔支架降解和大鼠股骨成骨细胞生理活性之间的相互影响.将大鼠股骨成骨细胞接种于PLGA多孔支架上,观察4周降解时间内成骨细胞增殖活性、碱性磷酸酶(ALP)活性和钙浓度的变化以及PLGA相对分子质量损失、拉伸性能和压缩性能的变化.实验结果表明,支架降解初期,成骨细胞增殖活性较高,ALP活性和分泌钙的浓度较低;支架降解中后期,细胞增殖速度明显减慢,ALP活性和分泌钙的浓度明显下降.接种有细胞的支架降解过程中相对分子质量减小的速度快于对照组,力学拉伸强度和压缩杨氏模量低于对照组.支架材料中后期降解对细胞产生的影响大于降解初期,细胞附着于支架的生理活动加快了支架降解速度.     

Osteogenic differentiation of mesenchymal stem cells promoted by overexpression of connective tissue growth factor

Objective: Large segmental bone defect repair remains a clinical and scientific challenge with increasing interest focusing on combining gene transfection with tissue engineering techniques. The aim of this study is to investigate the effect of connective tissue growth factor (CTGF) on the proliferation and osteogenic differentiation of the bone marrow mesenchymal stem cells (MSCs). Methods: A CTGF-expressing plasmid (pCTGF) was constructed and transfected into MSCs. Then expressions of bone morphogenesis-related genes, proliferation rate, alkaline phosphatase activity, and mineralization were examined to evaluate the osteogenic potential of the CTGF gene-modified MSCs. Results: Overexpression of CTGF was confirmed in pCTGF-MSCs. pCTGF transfection significantly enhanced the proliferation rates of pCTGF-MSCs (P<0.05). CTGF induced a 7.5-fold increase in cell migration over control (P<0.05). pCTGF transfection enhanced the expression of bone matrix proteins, such as bone sialoprotein, osteocalcin, and collagen type I in MSCs. The levels of alkaline phosphatase (ALP) activities of pCTGF-MSCs at the 1st and 2nd weeks were 4.0- and 3.0-fold higher than those of MSCs cultured in OS-medium, significantly higher than those of mock-MSCs and normal control MSCs (P<0.05). Overexpression of CTGF in MSCs enhanced the capability to form mineralized nodules. Conclusion: Overexpression of CTGF could improve the osteogenic differentiation ability of MSCs, and the CTGF gene-modified MSCs are potential as novel cell resources of bone tissue engineering.     

成人骨髓基质细胞的体外培养

本研究从成人的髋骨抽取骨髓液，离心后将骨髓基质细胞悬液接种培养，待细胞贴壁融合后，进行传代扩增培养．并采用流式细胞术进行细胞周期分析，结果表明原代培养和传代培养的细胞均为贴壁、形态不一的骨髓基质细胞，且此体外培养的骨髓基质细胞具有很强的增殖能力．本研究成功地建立了一套完整、简单、可行的体外分离、长期培养扩增人骨髓基质细胞(Human Bone Marrow Stromal Cells hBMSCs)的系统，证明成人骨髓基质细胞能够在体外长期增殖，为人的骨髓基盾细胞的理论研究和临床应用奠定了基础.