EGCG对肿瘤干细胞抑制效应研究进展

表没食子儿茶素没食子酸酯((-)-Epigallocatechin-3-gallate,EGCG)是绿茶主要活性成分之一,对肿瘤干细胞(Cancer stem cells,CSCs)具备抑制效应.综述了EGCG对CSCs迁移侵袭性、耐药性、自我更新和致瘤性等病理学特性的抑制效应及应用新策略,并对相应信号传导通路进行阐述,为深入研究EGCG抗癌的药理学效应及应用新策略提供借鉴.     

基础教育课程改革与教师的自我更新

《基础教育课程改革纲要(试行)》的颁布和实施,标志着我国基础教育改革进入了一个新的时期,它将对教师教学观念的更新、知识结构的调整和教学方式的转变、教育能力的提高产生深远的影响。教师在基础教育课程改革中,将不断实现自我更新,提升自身素养。     

Stem cells and their niche: a matter of fate

Embryonic stem cells provide an in vitro model for developmental biologists to study cell fate decisions during ontogenesis, while somatic stem cells allow physiologists to understand tissue homeostasis in the adult. The behavior of stem cells is dependent on an intimate relationship with a supportive niche. This brief review highlights some of the most important recent trends in stem cell biology, focusing in particular on the supportive microenvironments for both embryonic and adult stem cells. Known intrinsic and extrinsic molecular players from the best-characterized stem cell types are summarized, illuminating a number of shared environmental cues among tissues originating from all three embryonic germ layers. Received 6 October 2005; received after revision 27 December 2005; accepted 17 January 2006     

RhoGTPases in stem cells

RhoGTPases are small molecules that control a wide variety of signal transduction pathways. Their profound function in regulating the actin cytoskeleton is well recognized. Stem cells are unique in their ability to self-renew and produce progenitor cells that can differentiate into specialized cells. RhoGTPases influence stem cell morphology and cell migration as well as stem cell self-renewal, proliferation, transplantation, homing and differentiation. In this review, the multiple roles of the RhoGTPases in stem cells are discussed.