Study the pathological features of diseases using induced pluripotent stem cells derived form patient's somatic cells
The limited experimental access to disease-affected human tissues has severely impeded the elucidating of molecular mechanisms underlying disease development. Generation of induced pluripotent stem cells (iPSCs) by over-expression of defined transcription factors in somatic cells, in particular in those from patient somatic cells, presents an attractive and promising approach to model the early stages of diseases in vitro and to screen novel biomarkers as well as therapeutic medicines. Recently, many research groups have independently reported that patient-specific iPSC-derived cells recapitulated multiple features of pathological events of a particular disease, offering experimental evidence of utilizing patient-specific iPSCs to model diseases and reevaluate the current therapies. We have derived iPSC lines using somatic cells of patients suffering from Klinefelter's Syndrome (KS) and Alzheimer's Disease (AD) and explored the possibility to use these iPSC lines to recapitulate the pathological features of the diseases. Our results show that patient's specific iPSC lines provide good opportunity to study the development and treatment of diseases.
sRNA Induces the Large-scale Transdetermination of Mesenchymal Stem Cells into Hematopoietic Stem Cells in Human.
Mesenchymal stem cells (MSCs) can differentiate into cells of bone, endothelium, adipose tissue, cartilage, muscle, and brain. However, whether they can transdeterminate into hematopoietic stem cells (HSCs) remains unsolved. We report here that a subpopulation of human MSCs that are CD44+,CD29+, CD105+, CD166+,CD133-,CD34- could differentiate into hematopoietic stem cells (CD150+/CD133+/CD34+) and their descending blood cells in vitro, when transfected with new endogenous shRNAs The sRNA was high-effectively delivered into MSCs by a novel peptide means. These induced MSC-HSCs could form different types of hematopoietic colonies as nature-occurring HSCs did. Upon transplantation into sublethally irradiated NOD/SCID mice, these MSC-HSCs engrafted and differentiated into all hematopoietic lineages such as erythrocytes, lymphocytes, myelocytes and thrombocyte. More importantly, these induced HSCs could successfully engraft and effectively function in patients with severe aplastic anemia. Furthermore, we demonstrated the first evidence that the transdetermination of MSCs was induced by acetylation of histone proteins and activation of many transcriptional factors. Together, our findings identify the sRNAs that dictates a directed differentiation of MSCs toward HSCs and open up a new source for HSCs used for the treatment of blood diseases and artificial stem cell-made blood.
GE公司His标签蛋白纯化预装柱HisTrap™ FF Crude使用技巧
主要介绍了His标签蛋白纯化预装柱HisTrap™ FF Crude的实验过程，原理，说明，一般事项，样品制备，纯化操作， 按比例放大， 柱的清洗及保存等。
Study the pathological features of diseases using induced pluripotent stem cells derived form patient's somatic cells
The limited experimental access to disease-affected human tissues has severely impeded the elucidating of molecular mechanisms underlying disease development. Generation of induced pluripotent stem cells (iPSCs) by over-expression of defined transcription factors in somatic cells, in particular in those from patient somatic cells, presents an attractive and promising approach to model the early stages of diseases in vitro and to screen novel biomarkers as well as therapeutic medicines. Recently, many research groups have independently reported that patient-specific iPSC-derived cells recapitulated multiple features of pathological events of a particular disease, offering experimental evidence of utilizing patient-specific iPSCs to model diseases and reevaluate the current therapies. We have derived iPSC lines using somatic cells of patients suffering from Klinefelter's Syndrome (KS) and Alzheimer's Disease (AD) and explored the possibility to use these iPSC lines to recapitulate the pathological features of the diseases. Our results show that patient's specific iPSC lines provide good opportunity to study the development and treatment of diseases.
Christopher deCharms:即时扫描大脑的技术
神经科学家和发明家Christopher deCharms展示一种新的方式利用功能磁共振成像显示大脑活动-思想，情感，痛苦-当它正在发生时。换句话说，你可以看到你的感受。
Frederick Balagadde:微芯片上的生化室
要阻止撒哈拉南部非洲各国的疾病流行，仅靠药品是不够的。我们还需要与之配套的诊断工具。TED资深会员Frederick Balagadde向我们展示如何通过微型化技术把笨重昂贵的化验室集成至一个芯片大小，从而大大提高它的诊断能力和普及性。
Dave deBronkart：所有病人应彼此交流
当Dave deBronkart了解到他得了一种罕见的晚期癌症，他在网上向和他一样的一群病人求助，并且找到了一种甚至他自己的医生都没听过的治疗方法。这救了他的命。 现在他号召所有的病人彼此交流，了解自身的健康数据，使医疗事业在每个e-病人的基础上变得更好。
你的故事：ENCOde和人类基因组计划
自从修道士孟德尔开始种植豌豆，我们开始了解基因。1953年，Watson，Crick以及Franklin描述构成我们基因组的分子机构：DNA双螺旋。2001年，科学家们破解人类基因组的30亿个编码。现在，他们尝试说明这种遗传代码，来解释他们如何形成不同的细胞类型乃至不同的个体。ENCOde工程是关于你的最新的章节。
ENCOde:DNA元素的百科全书
ENCOde计划完成DNA元素的百科全书，是从人类基因组计划到数据的大计划。ENCOde科学家已经设法了解80%的基因组的功能，包括功能基因及部分调控基因。这些信息对于我们了解基因组如何形成不同的细胞类型乃至不同的个体会有帮助，关键是DNA水平的损伤怎样导致疾病的。
