项目名称: Brd2调控胰岛B细胞增殖的机制研究
项目编号: No.81200561
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 医学二处
项目作者: 刘晓霞
作者单位: 复旦大学
项目金额: 23万元
中文摘要: 胰岛B细胞是机体分泌胰岛素的重要组织,因此如何维持胰岛B细胞的数量和功能是糖尿病研究领域的一个重要问题。研究发现一个双 Bromodomain 蛋白(Brd2)在胰岛B细胞增殖方面有重要的调节作用。在Brd2蛋白表达被抑制的小鼠模型中,胰岛的体积,数量以及胰岛素的分泌量均有显著提高,但其调控胰岛B细胞增殖的具体机制并不明确。在肿瘤细胞中Brd2可通过特异性识别组蛋白末端乙酰化的赖氨酸位点, 将SWI/SNF等转录复合物连接到乙酰化的染色质上,从而参与目标基因的表达调控。我们在前期研究中,通过Piggybac转座子技术,构建出Brd2+/-小鼠模型,并获得与之前研究结果相同的表现性状。我们拟利用该动物模型及体外培养胰岛B细胞系,来验证Brd2及SWI/SNF转录复合物之间在胰岛B细胞中的相互作用,并进一步研究其下游信号通路,为糖尿病治疗的研究提供新的方向。
中文关键词: 胰岛B细胞;Brd2蛋白;增殖;信号通路;
英文摘要: Pancreatic beta cell plays an important role in insulin secretion. Thus the maintenance of the function and volume of pancreatic beta cells is an important issue in diabetes studies. Recent studies showed that a double Bromodomain protein (Brd2) was critical for the regulation of pancreatic beta cell proliferation.Brd2 knock down mice showed a significant increase in islet number, volume and insulin secretion level, but the underlying mechanism is still not very clear. Brd2 can particularly bind to acetyl-histone and recruit other chromatin remodeling complex (such as SWI/SNF) to the chromatin. Therefore, it involves in the regulation of chromatin remodeling and gene transcription. In our pilot studies, we used piggybac transposon to build up Brd2 knock down mice (Brd2 +/-).Similar phenotypes were found in our model compared to previous studies. By using this new Brd2 KD animal model and other in vitro cell lines, we can investigate the interaction of Brd2 and SWI/SNF complex and their downstream signaling pathway in pancreatic beta cells. This will give us new direction in the studies of diabetes treatment.
英文关键词: Pancreatic beta cells;Brd2;Proliferation;Signal pathway;