共查询到20条相似文献，搜索用时 31 毫秒
1.
Chamberlain JR Schwarze U Wang PR Hirata RK Hankenson KD Pace JM Underwood RA Song KM Sussman M Byers PH Russell DW 《Science (New York, N.Y.)》2004,303(5661):1198-1201
Adult stem cells offer the potential to treat many diseases through a combination of ex vivo genetic manipulation and autologous transplantation. Mesenchymal stem cells (MSCs, also referred to as marrow stromal cells) are adult stem cells that can be isolated as proliferating, adherent cells from bones. MSCs can differentiate into multiple cell types present in several tissues, including bone, fat, cartilage, and muscle, making them ideal candidates for a variety of cell-based therapies. Here, we have used adeno-associated virus vectors to disrupt dominant-negative mutant COL1A1 collagen genes in MSCs from individuals with the brittle bone disorder osteogenesis imperfecta, demonstrating successful gene targeting in adult human stem cells. 相似文献
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Mezey E Chandross KJ Harta G Maki RA McKercher SR 《Science (New York, N.Y.)》2000,290(5497):1779-1782
Bone marrow stem cells give rise to a variety of hematopoietic lineages and repopulate the blood throughout adult life. We show that, in a strain of mice incapable of developing cells of the myeloid and lymphoid lineages, transplanted adult bone marrow cells migrated into the brain and differentiated into cells that expressed neuron-specific antigens. These findings raise the possibility that bone marrow-derived cells may provide an alternative source of neurons in patients with neurodegenerative diseases or central nervous system injury. 相似文献
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Generalized potential of adult neural stem cells 总被引：1，自引：0，他引：1
Clarke DL Johansson CB Wilbertz J Veress B Nilsson E Karlström H Lendahl U Frisén J 《Science (New York, N.Y.)》2000,288(5471):1660-1663
The differentiation potential of stem cells in tissues of the adult has been thought to be limited to cell lineages present in the organ from which they were derived, but there is evidence that some stem cells may have a broader differentiation repertoire. We show here that neural stem cells from the adult mouse brain can contribute to the formation of chimeric chick and mouse embryos and give rise to cells of all germ layers. This demonstrates that an adult neural stem cell has a very broad developmental capacity and may potentially be used to generate a variety of cell types for transplantation in different diseases. 相似文献
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Mammalian neural stem cells 总被引：4，自引：0，他引：4
Gage FH 《Science (New York, N.Y.)》2000,287(5457):1433-1438
Neural stem cells exist not only in the developing mammalian nervous system but also in the adult nervous system of all mammalian organisms, including humans. Neural stem cells can also be derived from more primitive embryonic stem cells. The location of the adult stem cells and the brain regions to which their progeny migrate in order to differentiate remain unresolved, although the number of viable locations is limited in the adult. The mechanisms that regulate endogenous stem cells are poorly understood. Potential uses of stem cells in repair include transplantation to repair missing cells and the activation of endogenous cells to provide "self-repair. " Before the full potential of neural stem cells can be realized, we need to learn what controls their proliferation, as well as the various pathways of differentiation available to their daughter cells. 相似文献
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【目的】分析骨髓间充质干细胞在体外定向分化为脂肪细胞的适宜诱导条件.阻断正常干细胞的分化过程,探讨肿瘤发生机理.【方法】利用贴壁培养法获得大鼠骨髓间充质干细胞(bone marrow mesenchymal stem cells,BMSCs),通过地塞米松、胰岛素和吲哚美辛联合诱导大鼠BMSCs,使其分化为脂肪细胞.在细胞分化过程中利用3-甲基胆蒽(3-MC)阻断大鼠BMSCs的分化过程.【结果】大鼠BMSCs分化试验显示:诱导30d后经油红O染色,细胞内可见脂肪细胞特有的红色脂滴沉淀,并且随着诱导时间的延长,油红O阳性细胞比例增加,脂滴增大,表明大鼠BMSCs已成功分化为脂肪细胞.大鼠BMSCs分化阻断试验显示:诱导30d后经油红O染色细胞内红色脂滴沉淀明显下降,表明阻断后的细胞具有脂肪细胞的特性,但分化不完全;形态学鉴定表现出:细胞接触抑制消失,细胞核异常,微核畸变率高,核型异常,表明阻断后的干细胞发生恶性转变.【结论】通过地塞米松、胰岛素和吲哚美辛的联合作用,诱导BMSCs成功向脂肪细胞分化.在BMSCs向脂肪细胞分化的过程中加入阻断剂3-MC,阻断其分化过程,表明干细胞分化过程受到阻断,细胞停止在分化的中间阶段,有转化成肿瘤细胞的趋势. 相似文献
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【目的】建立昆明小鼠骨髓间充质干细胞的分离、培养体系,并鉴定其定向诱导分化为神经及脂肪细胞的能力。【方法】采用贴壁培养法分离培养昆明小鼠骨髓间充质干细胞（MSCs）,通过相差倒置显微镜对其进行形态学特征观察;通过碱性磷酸酶（AKP）染色、Hoechst 33258染色、瑞士-姬姆萨复合染色检测MSCs的表型特征;通过β-ME诱导MSCs定向分化为神经样细胞,诱导后的细胞进行H.E染色,观察其形态学特性;通过NF-200、NSE免疫荧光细胞化学方法对已分化的神经样细胞进行鉴定和分化率分析;通过马血清诱导MSCs定向分化为脂肪细胞,观察其体外生长过程,并对诱导后的脂肪细胞进行油红O染色鉴定和分化率分析。【结果】分离得到的MSCs为成纤维样细胞,可见多个核仁,AKP染色阳性率为93.2%±1.5%;β-ME诱导后,MSCs分化为多种表型的神经细胞与原代培养的小鼠全脑细胞的外形相似,诱导后的神经细胞NF-200、NSE免疫荧光细胞化学染色均呈阳性,NF-200阳性率为85.4%±1.8%,NSE阳性率为82.7%±2.1 %;马血清诱导后,MSCs可100%分化为脂肪细胞,油红O染色为阳性。【结论】 采用贴壁培养法能够成功分离和培养昆明小鼠的MSCs,分离得到的MSCs具有定向分化成多种神经细胞和脂肪细胞的能力。 相似文献
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干细胞及其在人类医学上的应用前景 总被引：1，自引：0，他引：1
干细胞是指从胚胎、胎儿或成年个体各种组织中分离出来的多能性细胞 ,具有体外保持未分化状态的无限增殖能力 ,在不同条件下可诱导分化为不同的细胞类型、组织甚至器官。胚胎癌细胞、胚胎干细胞、胚胎生殖细胞和成年组织干细胞是目前研究的几类主要干细胞 ,它们除作为发育生物学研究的细胞模型外 ,在人类医学领域也具有潜在的应用价值 相似文献
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Out of Eden: stem cells and their niches 总被引：2，自引：0，他引：2
Stem cells are currently in the news for two reasons: the successful cultivation of human embryonic stem cell lines and reports that adult stem cells can differentiate into developmentally unrelated cell types, such as nerve cells into blood cells. Both intrinsic and extrinsic signals regulate stem cell fate and some of these signals have now been identified. Certain aspects of the stem cell microenvironment, or niche, are conserved between tissues, and this can be exploited in the application of stem cells to tissue replacement therapy. 相似文献
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分离鉴定羚牛骨髓间充质干细胞,为开展羚牛细胞治疗与体细胞核移植的深入研究提供有效载体。分离培养来源于羚牛骨髓的间充质干细胞;通过染色体G显带技术进行核型分析;利用流式细胞技术检测细胞表面标记物;通过定向诱导培养探究细胞的分化潜能。结果表明,羚牛骨髓间充质干细胞能够维持正常核型,对间充质干细胞特异性表面标记 CD105、CD73、CD90、CD166、CD44呈阳性,对 CD14(单核细胞和巨噬细胞标记物),CD19(b细胞标记物),CD34(造血干细胞标记物),CD45(泛白细胞标记物)和 HLA-DR均呈阴性,具有成脂、成骨与成软骨多向分化潜能。表明成功分离羚牛骨髓间充质干细胞并对其表面抗原与分化潜能进行鉴定,为羚牛生物多样性保护与内源物种间充质干细胞的应用研究奠定基础。 相似文献
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Gershengorn MC Hardikar AA Wei C Geras-Raaka E Marcus-Samuels B Raaka BM 《Science (New York, N.Y.)》2004,306(5705):2261-2264
Insulin-expressing beta cells, found in pancreatic islets, are capable of generating more beta cells even in the adult. We show that fibroblast-like cells derived from adult human islets donated postmortem proliferate readily in vitro. These mesenchymal-type cells, which exhibit no hormone expression, can then be induced to differentiate into hormone-expressing islet-like cell aggregates, which reestablishes the epithelial character typical of islet cells. Immunohistochemistry, in situ hybridization, and messenger RNA measurements in single cells and cell populations establish the transition of epithelial cells within islets to mesenchymal cells in culture and then to insulin-expressing epithelial cells. 相似文献
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Purification and characterization of mouse hematopoietic stem cells 总被引：181，自引：0，他引：181
Mouse bone marrow hematopoietic stem cells were isolated with the use of a variety of phenotypic markers. These cells can proliferate and differentiate with approximately unit efficiency into myelomonocytic cells, B cells, or T cells. Thirty of these cells are sufficient to save 50 percent of lethally irradiated mice, and to reconstitute all blood cell types in the survivors. 相似文献
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DU Min-qing HUANG Yue-qin LU Nai-Sheng SHU Gang ZHU Xiao-tong WANG Li-na GAO Ping XI Qian-yun ZHANG Yong-liang WANG Song-bo JIANG Qing-yan 《农业科学学报》2014,13(4):837-848
Bone marrow mesenchymal stem cells （BMSCs） could differentiate into various cell types including adipocytes and myocytes, which had important scientific significance not only in the field of tissue regeneration, but also in the field of agricultural science. In an attempt to exhibit the characterization and differentiation into adipocytes and myocytes of porcine BMSCs, we isolated and purified porcine BMSCs by red blood cell lysis method and percoll gradient centrifugation. The purified cells presented a stretched fibroblast-like phenotype when adhered to the culture plate. The results of flow cytometry analysis and immunofluorescence staining demonstrated that the isolated cells were positive for mesenchymal surface markers CD29, CD44 and negative for hematopoietic markers CD45 and the adhesion molecules CD31. Cells were induced to differentiate into adipocytes with adipogenic medium containing insulin, dexamethasone, oleate and octanoate. Oil Red O staining demonstrated that the porcine BMSCs successfully differentiated to adipocytes. Moreover, the findings of real-time PCR and Western blotting indicated that the induced cells expressed adipogenic marker genes （PPAR-y, C/EBP-c~, perilipin, aP2） mRNA or proteins （PPAR-3,, perilipin, aP2）. On the other hand, porcine BMSCs were induced into myoctyes with myogenic medium supplemented with 5-azacytidine, basic fibroblast growth factor, chick embryo extract and horse serum. Morphological observation by hochest 33342 staining showed that the induced cells presented as multi-nucleus muscular tube structure. And myogenic marker genes （Myf5, desmin） mRNA or proteins （MyfS, MyoD, myogenin, desmin） were found in the induced cells. In addition, the results of immunofluorescence staining revealed that myogenic marker （Myf5, MyoD, myogenin, desmin, S-MyHC） proteins was positive in the induced cells. Above all, these results suggested that the isolated porcine BMSCs were not only consistent with the characterization of mesenchymal stem cells, but also exhibited the multipotential capacity to form adipocytes and myocytes, which provided the basis to investigate the regulation mechanism involved in the selective differentiation of porcine BMSCs. 相似文献
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Induced pluripotent stem cell lines derived from human somatic cells 总被引：10，自引：0，他引：10
Yu J Vodyanik MA Smuga-Otto K Antosiewicz-Bourget J Frane JL Tian S Nie J Jonsdottir GA Ruotti V Stewart R Slukvin II Thomson JA 《Science (New York, N.Y.)》2007,318(5858):1917-1920
Somatic cell nuclear transfer allows trans-acting factors present in the mammalian oocyte to reprogram somatic cell nuclei to an undifferentiated state. We show that four factors (OCT4, SOX2, NANOG, and LIN28) are sufficient to reprogram human somatic cells to pluripotent stem cells that exhibit the essential characteristics of embryonic stem (ES) cells. These induced pluripotent human stem cells have normal karyotypes, express telomerase activity, express cell surface markers and genes that characterize human ES cells, and maintain the developmental potential to differentiate into advanced derivatives of all three primary germ layers. Such induced pluripotent human cell lines should be useful in the production of new disease models and in drug development, as well as for applications in transplantation medicine, once technical limitations (for example, mutation through viral integration) are eliminated. 相似文献
17.
Vogel G 《Science (New York, N.Y.)》2000,290(5497):1672-1674
On pages 1775 and 1779, independent research teams describe experiments in which bone marrow cells became neuronlike cells in the brain, providing new evidence for the versatility of adult stem cells. But ample uncertainties must be resolved before such results can be translated into therapeutics. The most important next step, say several stem cell researchers, is to identify the molecular processes that underlie the impressive feats of stem cells, as many of the purported breakthroughs are simply observations. 相似文献
18.
Wakayama T Tabar V Rodriguez I Perry AC Studer L Mombaerts P 《Science (New York, N.Y.)》2001,292(5517):740-743
Embryonic stem (ES) cells are fully pluripotent in that they can differentiate into all cell types, including gametes. We have derived 35 ES cell lines via nuclear transfer (ntES cell lines) from adult mouse somatic cells of inbred, hybrid, and mutant strains. ntES cells contributed to an extensive variety of cell types, including dopaminergic and serotonergic neurons in vitro and germ cells in vivo. Cloning by transfer of ntES cell nuclei could result in normal development of fertile adults. These studies demonstrate the full pluripotency of ntES cells. 相似文献
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新生牛与成年牛骨髓间充质干细胞的生物学特性比较 总被引：1，自引：1，他引：0
【目的】建立体外分离、培养和扩增牛骨髓间充质干细胞（bone marrow mesenchymal stem cells,BMSCs）的方法,研究牛龄对BMSCs增殖特性的影响。【方法】用贴壁筛选法纯化新生牛与成年牛的BMSCs,传代扩增,测定生长曲线和贴壁率,并进行形态学观察。【结果】通过体外培养,可使体内环境下低丰度的BMSCs实现扩增。新生牛BMSCs易于分离纯化,贴壁率及增殖能力显著高于成年牛。【结论】新生牛比成年牛更适于BMSCs的提取。BMSCs的增殖生长特性与年龄密切相关,增殖能力和活性随着年龄的增加而降低,成功地建立了一种分离培养牛BMSCs的方法,分析了BMSCs部分生物学特性,为进一步深入研究BMSCs的诱导分化和应用打下基础。 相似文献
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喜树茎解剖构造及插条不定根的形成 总被引：3，自引：0，他引：3
利用喜树当年生半木质化枝条,研究了喜树茎解剖构造及插穗愈伤组织和不定根发生的情况。结果表明:喜树皮层和髓中存在异细胞,皮层存在环状厚壁组织,但不影响不定根发生,喜树插穗不定根原始体来源于维管形成层和韧皮组织与髓射线交叉部位,愈伤组织不分化为不定根。 相似文献