题 目:C/EBPb-delta-secretase Axis Mediates the Pathogenesis of Alzheimer's Disease
报告人: 叶克强 埃默里大学教授
主持人: 宋高洁 研究员
时 间: 10月22日 下午3点(周一)
地 点: 生命科学学院543小会议室
报告人简介:叶克强博士于1990年毕业于吉林大学(本科),随后博士毕业于埃默里大学(1998),在霍普金斯大学完成博士后以后,于埃默里大学(Emory University)开始教职,历任助理教授(2001)、副教授(2007)、教授(2010)。叶克强教授是世界公认的小分子化合物治疗研发的领军科学家之一,是研发小分子化合物治疗神经退行性疾病领域的国际权威。 他的论文多发表在国际顶级科学及生物杂志上,如Nature, Cell, Nature Medicine等,共计160多篇,总影响因子1342分,被引次数共计近10000次。叶克强教授曾荣获多项国际科学奖项,其中2003年至2006年获得Distinguished Young Scientist Award, The Sontag Foundation;2004年获得American Cancer Society Scholar等奖励。叶克强教授现主要研究方向包括:1、分子信号传导在神经生物学和癌症生物学领域的研究;2、小分子抗癌症药物的开发与研究;3、小分子神经退行性疾病新药物的开发与研究;4、药物的筛选,化学合成,改造及药物设计。
报告内容简介:Delta-secretase cleaves both APP and Tau to mediate the formation of amyloid plaques and neurofibrillary tangle in Alzheimer's disease (AD). However, how aging contributes to an increase in delta-secretase expression and AD pathologies remains unclear. Here we show that a CCAAT-enhancer-binding protein (C/EBPβ), an inflammation-regulated transcription factor, acts as a key age-dependent effector elevating both delta-secretase (AEP) and inflammatory cytokines expression in mediating pathogenesis in AD mouse models. We find that C/EBPβ regulates delta-secretase transcription and protein levels in an age-dependent manner. Overexpression of C/EBPβ in young 3xTg mice increases delta-secretase and accelerates the pathological features including cognitive dysfunctions, which is abolished by inactive AEP C189S. Conversely, depletion of C/EBPβ from old 3xTg or 5XFAD mice diminishes delta-secretase and reduces AD pathologies, leading to amelioration of cognitive impairment in these AD mouse models. Thus, our findings support that C/EBPβ plays a pivotal role in AD pathogenesis via increasing delta-secretase expression.