中国神经再生研究(英文版) ›› 2017, Vol. 12 ›› Issue (11): 1865-1869.doi: 10.4103/1673-5374.219050

• 原著:退行性病与再生 • 上一篇    下一篇

成年小鼠VE-cadherin阳性表达神经前体细胞可补充黑质多巴胺能神经元

  

  • 收稿日期:2017-09-23 出版日期:2017-11-15 发布日期:2017-11-15
  • 基金资助:

    美国NIH基金;Boise State大学生物分子研究中心资助项目

Nigral dopaminergic neuron replenishment in adult mice through VE-cadherin-expressing neural progenitor cells

Abir A. Rahman1, Nathan K. Lai2, Joshua E. Albright2, Paige E. Urquhart2, Abby R. Webb2, Brad E. Morrison1, 2   

  1. 1 Department of Biological Sciences, Boise State University, Boise, ID, USA; Biomolecular Ph.D. Program, Boise State University, Boise, ID, USA
    2 Department of Biological Sciences, Boise State University, Boise, ID, USA
  • Received:2017-09-23 Online:2017-11-15 Published:2017-11-15
  • Contact: Brad E. Morrison, Ph.D.,bradmorrison@boisestate.edu.
  • Supported by:

    Student support was provided by the Institutional Development Awards (IDeA) from the National Institute of General Medical Sciences of the National Institutes of Health under Grants No. P20GM103408 and P20GM109095. Additional support was provided by The Biomolecular Research Center at Boise State University.

摘要:

黑质多巴胺能神经元丢失会导致帕金森病患者运动功能障碍,为了找到可弥补丢失的神经元的方法,有必要了解成体大脑黑质多巴胺能神经元是如何得到补充的。最近的研究已经通过检测Nestin+/Sox2-神经前体细胞,证实了这些神经元的成年神经发生。实验试图进一步验证这一发现,并探索这些前体细胞的潜在非典型起源。由于神经前体细胞与脑的脉管系统关系紧密,并且内皮细胞亚群表现为Nestin阳性,我们假设多巴胺能神经前体细胞可能脑内皮细胞为共享细胞系。因此,实验采用VE-钙粘蛋白启动子驱动的CREERT2:THlox/lox转基因小鼠,以去除成年动物内皮细胞中酪氨酸羟化酶基因功能。26周后,VE-钙粘蛋白(VE-cadherin)阳性细胞中酪氨酸羟化酶基因表达被抑制,黑质中酪氨酸羟化酶阳性神经元显著减少。该遗传谱系追踪研究的结果表明,成年小鼠多巴胺能神经元可能由内皮细胞谱系来源的VE-钙粘蛋白阳性前体细胞所补充。

orcid:0000-0002-6356-7149(Brad E. Morrison)

关键词: 神经再生, 神经前体细胞, 成体神经发生, 多巴胺能神经元, 内皮细胞, 黑质, 帕金森病

Abstract:

The function of dopaminergic neurons in the substantia nigra is of central importance to the coordination of movement by the brain’s basal ganglia circuitry. This is evidenced by the loss of these neurons, resulting in the cardinal motor deficits associated with Parkinson’s disease. In order to fully understand the physiology of these key neurons and develop potential therapies for their loss, it is essential to determine if and how dopaminergic neurons are replenished in the adult brain. Recent work has presented evidence for adult neurogenesis of these neurons by Nestin+/Sox2– neural progenitor cells. We sought to further validate this finding and explore a potential atypical origin for these progenitor cells. Since neural progenitor cells have a proximal association with the vasculature of the brain and subsets of endothelial cells are Nestin+, we hypothesized that dopaminergic neural progenitors might share a common cell lineage. Therefore, we employed a VE-cadherin promoter-driven CREERT2:THlox/THlox transgenic mouse line to ablate the tyrosine hydroxylase gene from endothelial cells in adult animals. After 26 weeks, but not 13 weeks, following the genetic blockade of tyrosine hydroxylase expression in VE-cadherin+ cells, we observed a significant reduction in tyrosine hydroxylase+ neurons in the substantia nigra. The results from this genetic lineage tracing study suggest that dopaminergic neurons are replenished in adult mice by a VE-cadherin+ progenitor cell population potentially arising from an endothelial lineage.

Key words: nerve regeneration, neural progenitor cells, adult neurogenesis, endothelial cells, substantia nigra, dopaminergic neurons, Parkinson’s disease, mouse model