项目名称: 维生素A缺乏/过量诱发胎鼠腭裂的作用机制
项目编号: No.U1304327
项目类型: 联合基金项目
立项/批准年度: 2014
项目学科: 农业科学
项目作者: 刘小转
作者单位: 河南科技大学
项目金额: 30万元
中文摘要: 视黄酸是维生素A的生物活性形式,缺乏/过量可导致腭裂在内的多种出生缺陷。我们在前期研究中发现,视黄酸可改变胎鼠腭组织中TGF-β及下游基因Smads的表达模式;另一方面,用TGF-β处理胎鼠腭间充质细胞,可降低视黄酸受体的表达水平,并抑制视黄酸与其受体形成的复合物与DNA反应元件结合。这些资料提示:视黄酸途径和TGF-β/Smad途径间存在相互作用。为阐明二者间的作用机制,我们拟使用前期建立的体内外腭裂模型,结合现代组织病理技术和分子生物学研究手段,在胎鼠次生腭发育期,集中观察视黄酸途径中关键基因和TGF-β3/Smad途径在时空方面的调节模式,以及在双侧腭板融合进程中,这种作用模式对上皮组织细胞消失、间充质组织细胞增殖、迁移、分泌、分化等所产生的影响,进而达到从不同层面和角度揭示视黄酸类化合物诱发腭裂的始发环节和关键分子病理变化的目的。
中文关键词: 小鼠;腭裂;维甲酸;腭突间充质细胞;转化生长因子β
英文摘要: Retinoic acid is the bioactivity form of vitamin A. Excess or deficiency of retinoic acid leads to various birth defects including cleft palate. In the previous study, we found that retinoic acid would alter the expressions of TGF-β and Smads in the palate of fetal mouse. On the other hand, the TGF-β treatment could decrease the mRNA expressions of retinoic acid receptors and inhibit the binding of DNA response element with the complex formed by retinoic acid and its receptors in the fetal mouse palatal mesenchymal cells. The data suggested that there is a cross-talk between TGF-β/Smad pathway and RA signaling. To investigate the molecular mechanism of the interaction between these two, a bilateral palatal shelves organ culture model and palatal mesenchymal/epithelial cells culture systems in vitro, combined with cleft palate animal model in vivo, will be used in our project. Using the histopathology technology and molecular biology research techniques, we will closely observe the time and space distribution of TGF-β/Smad signaling pathway regulated by different RA receptor subtypes and the influence on the disappearance of midline epithelial seam (MES) and the mesenchymal cells proliferation, migration, differentiation during the secondary palate development of fetal mouse. The aim of this wok is to reveal the
英文关键词: mouse;cleft palate;retinoic acid;palatal mesenchyme cells;transforming growth factorβ