首页> 外文期刊>BMC Neuroscience >Contribution of constitutively proliferating precursor cell subtypes to dentate neurogenesis after cortical infarcts
【24h】

Contribution of constitutively proliferating precursor cell subtypes to dentate neurogenesis after cortical infarcts

机译:组成性增生前体细胞亚型对皮层梗死后齿状神经发生的贡献

获取原文
       

摘要

Background It is well known that focal ischemia increases neurogenesis in the adult dentate gyrus of the hippocampal formation but the cellular mechanisms underlying this proliferative response are only poorly understood. We here investigated whether precursor cells which constitutively proliferate before the ischemic infarct contribute to post-ischemic neurogenesis. To this purpose, transgenic mice expressing green fluorescent protein (GFP) under the control of the nestin promoter received repetitive injections of the proliferation marker bromodeoxyuridine (BrdU) prior to induction of cortical infarcts. We then immunocytochemically analyzed the fate of these BrdU-positive precursor cell subtypes from day 4 to day 28 after the lesion. Results Quantification of BrdU-expressing precursor cell populations revealed no alteration in number of radial glia-like type 1 cells but a sequential increase of later precursor cell subtypes in lesioned animals (type 2a cells at day 7, type 3 cells/immature neurons at day 14). These alterations result in an enhanced survival of mature neurons 4 weeks postinfarct. Conclusions Focal cortical infarcts recruit dentate precursor cells generated already before the infarct and significantly contribute to an enhanced neurogenesis. Our findings thereby increase our understanding of the complex cellular mechanisms of postlesional neurogenesis.
机译:背景技术众所周知,局灶性局部缺血会增加海马形成的成年齿状回中的神经发生,但是对这种增殖反应的细胞机制了解甚少。我们在这里调查是否缺血性梗死前组成性增殖的前体细胞促成缺血后神经发生。为此,在巢蛋白启动子控制下表达绿色荧光蛋白(GFP)的转基因小鼠在诱发皮层梗死之前接受了重复注射的增殖标志物溴脱氧尿苷(BrdU)。然后,我们通过免疫细胞化学方法分析了病变后第4天到第28天这些BrdU阳性前体细胞亚型的命运。结果对表达BrdU的前体细胞群体的定量分析显示,病变动物中放射状胶质样1型细胞的数量没有改变,但后来的前体细胞亚型依次增加(第7天为2a型细胞,第3天为3型细胞/未成熟神经元) 14)。这些改变导致梗死后4周成熟神经元的存活增加。结论局灶性皮层梗塞募集了在梗塞之前已经产生的齿状前体细胞,并显着促进了神经发生。因此,我们的发现增加了我们对病变后神经发生的复杂细胞机制的理解。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号