共查询到19条相似文献，搜索用时 734 毫秒
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神经干细胞（NSCs）是具有高度自我更新能力并能分化为神经元、星形胶质细胞和少突胶质细胞的神经前体细胞,具有广阔的临床应用前景。神经营养素家族对神经干细胞的分化有一定影响。其包括：神经生长因子（NGF）、脑源性神经生长因子（BDNF）、神经营养素-3（NT-3）、神经营养素-4/5（NT-4/5）以及神经营养素-6（NT-6）。本文就目前神经营养素家族对NSCs分化的影响的研究现状进行综述。 相似文献
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神经干细胞 ( neural stem cells,NSCs)是中枢神经系统中保持分裂和分化潜能的细胞 ,目前对神经干细胞的研究主要集中于神经干细胞在脑中的起源 ,分布 ,对它的分化诱导研究及在治疗神经系统疾病中的应用等方面。并且 ,神经干细胞在神经损伤修复中具有良好的应用前景。 相似文献
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赵东民 《科技成果管理与研究》2016,(5):88-89
中枢神经系统疾病较难治愈,长期困扰广大患者和医务人员.南通大学神经再生重点实验室卞菁团队在干细胞及神经再生技术方面取得突破性进展,研发了一种快速直接定向诱导鼠胚胎干细胞分化为神经上皮细胞的方法来快速诱导NE细胞替代NSC细胞功能治疗中枢系统损伤,开发了一系列新颖快速有效的神经分化的方法诱导多功能干细胞分化为具有较长自我增殖能力的神经上皮干细胞,并进一步分化为具有较强自我增殖能力的神经胶质前体细胞,以利于进一步细胞移植用来治疗脊髓损伤. 相似文献
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以2-羟基-3-苯基-4-苯甲酰基-N-甲基-γ-内酰胺(A)为原料,通过酰化反应合成化合物2-氯乙酰基-3-苯基-4-苯甲酰基-N-甲基-γ-内酰胺(B),B的收率为86.7%。B对乙酰胆碱酯酶的抑制活性、谷丙转氨酶活性及黄疸指数的影响不明显,对黄疸指数几乎无影响,进一步的结构修饰及活性评价正在进行中。 相似文献
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干细胞技术
干细胞是机体内一类具有分化成为其他各种类型细胞的能力的一类多潜能细胞。干细胞具有自我更新和多潜能分化两种重要的能力。根据干细胞的来源不同,可以分为胚胎干细胞与成体干细胞。而根据干细胞分化潜能的不同,可以分为全能性干细胞与多能性干细胞。胚胎干细胞来源于早期胚胎发育的囊胚,囊胚内部细胞团经过机械分离、体外培养与扩增,具有自我更新与发育成为机体各个组织的能力。胚胎干细胞具有重要的医学与生物学价值,可以应用于临床治疗某些疾病。造血干细胞和神经干细胞等在临床治疗中已经发挥了重要的作用, 相似文献
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目的:观察大鼠急性脊髓损伤后GFAP在受损脊髓的不同时间点的表达变化,分析GFAP在脊髓内源性神经干细胞的增殖和分化过程中的作用机制,明确川芎嗪治疗脊髓损伤的分子机制。方法:将SD大鼠随机分组后利用改良Allen's法建立大鼠急性脊髓损伤模型。于造模后第8h、1d、3d、7d、14d、28d每组分别处死6只大鼠取材,免疫组化检测Brdu+、Nestin+细胞的表达及GFAP表达变化情况,并对结果进行统计分析和相关性分析。结果:脊髓损伤后,Brdu+细胞被激活,在脊髓中的表达明显增多,在脊髓白质、灰质及中央管室管膜区均有表达。Brdu+、Nestin+、GFAP+细胞表达均在第7天达到峰值,随后逐渐减少,且在损伤后第7天、14天、28天,川芎嗪组与C组比较均有显著差异(P0.01)。经对GFAP、Nestin+和Brdu+细胞在脊髓中的表达数进行相关性分析,GFAP表达与Nestin+细胞表达呈正相关趋势。结论:(1)川芎嗪能够促进脊髓损伤后GFAP的表达;(2)川芎嗪能够对脊髓损伤后内源性神经干细胞增殖分化有促进作用;(3)脊髓损伤早期GFAP的表达与脊髓内源性干细胞的增殖分化呈正相关趋势。 相似文献
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以2-羟基-3-苯基4苯甲酰基N甲基-γ-内酰胺（A）为原料,通过酰化反应合成化合物2氯乙酰基-3-苯基-4-苯甲酰基-N-甲基-γ-内酰胺（B）,B的收率为86．7％。B对乙酰胆碱酯酶的抑制活性、谷丙转氨酶活性及黄疸指数的影响不明显,对黄疽指数几乎无影响,进一步的结构修饰及活性评价正寿井行巾 相似文献
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背景与目的：探讨人骨髓间充质干细胞（human mesenchymal stem cells.hMSCs）在体内向神经细胞分化的可能性,材料与方法：将标记绿色荧光蛋白的人骨髓间充质干细胞植入到新生3d的小鼠侧脑室中,分别于移植后0d,9d和14d处死受体鼠,取其脑组织,4％多聚甲醛固定后行冠状面冰冻切片,荧光显微镜下观察hMSCs的植入,激光共聚焦显微镜检测植入细胞神经特异性蛋白的表达,定位双重标记的植入细胞,结果：受体小鼠脑中均可检出植入的细胞,此类细胞表达神经元细胞特异的微管相关蛋β-Ⅲ-Tubulin（Tuj1）,微管相关蛋白2（MAP2）,一些细胞表达神经胶质细胞特异的胶质原纤维酸性蛋白（GFAP）,结论：hMSCs植入后受到脑组织特定微环境的影响,在体内可以向神经细胞分化并参与到发育的神经系统中。 相似文献
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This paper reports a two-layered polydimethylsiloxane microfluidic device—Flip channel, capable of forming uniform-sized embryoid bodies (EBs) and performing stem cell differentiation within the same device after flipping the microfluidic channel. The size of EBs can be well controlled by designing the device geometries, and EBs with multiple sizes can be formed within a single device to study EB size-dependent stem cell differentiation. During operation of the device, cells are positioned in the designed positions. As a result, observation and monitoring specific population of cells can be achieved for further analysis. In addition, after flipping the microfluidic channel, stem cell differentiation from the EBs can be performed on an unconfined flat surface that is desired for various differentiation processes. In the experiments, murine embryonic stem cells (ES-D3) are cultured and formed EBs inside the developed device. The size of EBs is well controlled inside the device, and the neural differentiation is performed on the formed EBs after flipping the channel. The EB size-dependent stem cell differentiation is studied using the device to demonstrate its functions. The device provides a useful tool to study stem cell differentiation without complicated device fabrication and tedious cell handling under better-controlled microenvironments. 相似文献
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诱导多能干细胞因其具有类似胚胎干细胞的自我更新和分化潜能而成为生物学和医学等领域的研究热点之一.本文针对诱导多能干细胞的国内外专利文献进行检索、收集、统计及分析,综述了诱导多能干细胞的专利申请量、申请人分布及国别分布的特点,分析了诱导多能干细胞的诱导分化心肌细胞的主要专利技术路线,及诱导多能干细胞在临床上的应用,以期为... 相似文献
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Shenqiang Wang Letao Yang Bolei Cai Fuwei Liu Yannan Hou Hua Zheng Fang Cheng Hepeng Zhang Le Wang Xiaoyi Wang Qianxin Lv Liang Kong Ki-Bum Lee Qiuyu Zhang 《国家科学评论(英文版)》2022,9(4)
Cartilage injuries are often devastating and most cannot be cured because of the intrinsically low regenerative capacity of cartilage tissues. Although stem-cell therapy has shown enormous potential for cartilage repair, the therapeutic outcome has been restricted by low survival rates and poor chondrocyte differentiation in vivo. Here, we report an injectable hybrid inorganic (IHI) nanoscaffold that facilitates fast assembly, enhances survival and regulates chondrogenic differentiation of stem cells. IHI nanoscaffolds that strongly bind to extracellular matrix (ECM) proteins assemble stem cells through synergistic 3D cell–cell and cell–matrix interactions, creating a favorable physical microenvironment for stem-cell survival and differentiation in vitro and in vivo. Additionally, chondrogenic factors can be loaded into nanoscaffolds with a high capacity, which allows deep, homogenous drug delivery into assembled 3D stem-cell-derived tissues for effective control over the soluble microenvironment of stem cells. The developed IHI nanoscaffolds that assemble with stem cells are injectable. They also scavenge reactive oxygen species and timely biodegrade for proper integration into injured cartilage tissues. Implantation of stem-cell-assembled IHI nanoscaffolds into injured cartilage results in accelerated tissue regeneration and functional recovery. By establishing our IHI nanoscaffold-templated 3D stem-cell assembly method, we provide a promising approach to better overcoming the inhibitory microenvironment associated with cartilage injuries and to advance current stem-cell-based tissue engineering. 相似文献
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干细胞研究涉及伦理问题,在将相关研究成果转化为临床应用的过程中,还会使患者面临一系列的风险。为规范干细胞研究和应用,世界各国的相应机构推出了一系列的伦理审查规范和监管法规,对相关行为进行严格的控制,从而在不影响干细胞研究和应用发展的前提下,最大限度地保护各方权益。本文旨在为规范和完善我国干细胞研究和临床应用的伦理审查和监管体系提供参考。在对主要国家的干细胞的伦理审查和监管情况进行调研的基础上,重点选取美国和英国的干细胞监管体系进行深入剖析,总结这两个国家在干细胞监管体系中的做法,并对我国干细胞研究和应用的监管情况进行分析,针对存在的问题提出建议。 相似文献
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Cell-secreted soluble factor signaling in a diffusion dominant microenvironment plays an important role on early stage differentiation of pluripotent stem cells invivo. In this study, we utilized a membrane-based two-chambered microbioreactor (MB) to differentiate mouse embryonic stem cells (mESCs) in a diffusion dominant microenvironment of the top chamber while providing enough nutrient through the bottom chamber. Speculating that accumulated FGF4 in the small top chamber will augment neuronal differentiation in the MB culture, we first differentiated mESCs for 8 days by using a chemically optimized culture medium for neuronal induction. However, comparison of cellular morphology and expression of neuronal markers in the MB with that in the 6-well plate (6WP) indicated relatively lower neuronal differentiation in the MB culture. Therefore, to investigate whether microenvironment in the MB facilitates non-neuronal differentiation, we differentiated mESCs for 8 days by using chemically defined basal medium. In this case, differentiated cell morphology differed markedly between the MB and 6WP cultures: epithelial sheet-like morphology in the MB, whereas rosette morphology in the 6WP. Expression of markers from the three germ layers indicated lower neuronal but higher meso- and endo-dermal differentiation of mESCs in the MB than the 6WP culture. Moreover, among various cell-secreted soluble factors, BMP4 expression was remarkably upregulated in the MB culture. Inhibition of BMP4 signaling demonstrated that enhanced effect of upregulated BMP4 was responsible for the prominent meso- and endo-dermal differentiation in the MB. However, in the 6WP, downregulated BMP4 had a minimal influence on the differentiation behavior. Our study demonstrated utilization of a microbioreactor to modulate the effect of cell-secreted soluble factors by autoregulation and thereby inducing alternative self-capability of mESCs. Understanding and implementation of autoregulation of soluble factors similar to this study will lead to the development of robust culture systems to control ESC behavior. 相似文献
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Hori Ghaneialvar Leila Soltani Hamid Reza Rahmani Abbas Sahebghadam Lotfi Masoud Soleimani 《Indian journal of clinical biochemistry : IJCB》2018,33(1):46-52
Mesenchymal stem cells are multipotent cells capable of replicating as undifferentiated cells, and have the potential of differentiating into mesenchymal tissue lineages such as osteocytes, adipocytes and chondrocytes. Such lineages can then be used in cell therapy. The aim of present study was to characterize bone marrow derived mesenchymal stem cells in four different species, including: sheep, goat, human and mouse. Human bone-marrow mesenchymal stem cells were purchased, those of sheep and goat were isolated from fetal bone marrow, and those of mouse were collected by washing bone cavity of femur and tibia with DMEM/F12. Using flow-cytometry, they were characterized by CD surface antigens. Furthermore, cells of third passage were examined for their osteogenic and adipogenic differentiation potential by oil red and alizarin red staining respectively. According to the results, CD markers studied in the four groups of mesenchymal stem cells showed a different expression. Goat and sheep expressed CD44 and CD166, and weakly expressed CD34, CD45, CD105 and CD90. Similarly, human and mouse mesenchymal cells expressed CD44, CD166, CD105 and CD90 whereas the expression of CD34 and CD45 was negative. In conclusion, although all mesenchymal stem cells display plastic adherence and tri-lineage differentiation, not all express the same panel of surface antigens described for human mesenchymal stem cells. Additional panel of CD markers are necessary to characterize regenerative potential and possible application of these stem cells in regenerative medicine and implantology. 相似文献
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基于BP神经网络的参考咨询馆员素质评价模型 总被引：1，自引：0，他引：1
在建立参考咨询馆员素质评价指标体系的基础上,提出一种智能化的基于BP神经网络的参考咨询馆员素质评价方法。概述BP神经网络及其基本原理,并详述基于BP神经网络的参考咨询馆员素质评价模型的建立过程,包括神经网络结构的确定、网络训练,以及网络检验等。将该模型应用于实例检验,得到较满意的结果。 相似文献
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阐述了干细胞研究现状、发展趋势和应用前景 ,对如何推进我国干细胞工程学的发展提出了建议。 相似文献