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.

the Inner Life of the Cell

由哈佛大学制作的专业视频，描述了从细胞连接、细胞的运动到细胞膜的结构与功能，从细胞骨架到胞内物质的运输，从蛋白质合成到运输与分泌等等，揭示了生命的强大和奇妙。

immunotherapy against cancers(position of sellular therapy)

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.

Novel signaling by the IKK complex

Signal transduction plays a pivot role in regulating cell functions, from proliferation, differentiation, programmed cell death, and transformation. Deregulation of signal transduction could lead to various human diseases even cancer. Extracellular signals are transmitted into cells via an intracellular signaling network that is composed of multiple signaling pathways, dictating cellular functions, such as growth, differentiation, programmed death (apoptosis) and transformation.
Although we have learnt a great deal about the architecture of the intracellular signaling network, our understanding of its biology is limited. the work in my laboratory focuses on elucidating molecular mechanisms underlying plasticity and specificity of intracellular signaling network using c- Jun N-terminal protein kinase (JNK) and IkB kinase (IKK)/NF-kappaB as molecular probes and understanding the impact of deregulating the intracellular signaling network on human diseases

Paul Rothemund详细讲述 DNA 折叠

2007年,Paul Rothemund 给TED做了一个关于他自己研究方向,DNA折叠的概述演讲。这一次,他陈述了大量清楚的细节来描述这一领域的广阔前景——来建造极小的机器并让它们进行自我组装。

Discovery: Innovations with Ed Begley Jr

美国著名的《Discovery》频道创新系列节目《Innovations with Ed Begley Jr》全球播出了艾森生物最新研发的新一代实时心肌功能评价系统（xCELLigence RTCA CardioECR）。

本期节目主要关注在医疗健康领域的突破性进展。节目用七分多钟时间报道了艾森生物实时心肌细胞检测这项突破性的技术发明，并通过目前用药安全方面的问题调研及业内知名专家的采访，阐明了该发明在药物早期心脏毒性评价、用药安全、高通量新药筛选、心脏基础研究方面的价值和意义。

Jonathan Drori:存蓄数十亿种子的原因

在TED U 2009的这个简短的演讲中，Jonathan Drori鼓励我们保护生物多样性 -- 从一颗颗种子做起。他提醒我们要保护人类赖以生存的植物，同时他也给大家描述了千年种子库这样一个美好的远景，在这里面，将会有逾30亿颗的种子被人类珍藏，这其中甚至还包括那些正日益减少但却必不可少的植物物种。

Targets-based therapy for leukemia: opportunity and challenge

优点主要为：能增强患者的免疫力，防止肿瘤的转移和复发，对病人机体的损伤小。 在我国，现在普遍开展的树突状细胞（DC）和细胞因子诱导的杀伤细胞（CIK）的生物疗法被广泛应用。