中国神经再生研究(英文版) ›› 2024, Vol. 19 ›› Issue (2): 447-457.doi: 10.4103/1673-5374.373669

• 原著:脊髓损伤修复保护与再生 • 上一篇    下一篇

分离自器官型神经球的BMPRII+神经前体细胞及其特征:人类胎儿脊髓发育的体外模型

  

  • 出版日期:2024-02-15 发布日期:2023-08-30
  • 基金资助:
    澳大利亚国家健康与医学研究委员会(NHMRC)和巴克斯特慈善基金会资助;Rebecca L. Cooper医学研究基金会的医学研究资助;国际视网膜研究基金会(美国)Charles D. Kelman医学博士博士后奖(2010年)资助

BMPRII+ neural precursor cells isolated and characterized from organotypic neurospheres: an in vitro model of human fetal spinal cord development

Michael W. Weible II1, 2, *, Michael D. Lovelace1, 3, Hamish D. Mundell1, 4, Tsz Wai Rosita Pang1, Tailoi Chan-Ling1, *   

  1. 1Bosch Institute, Discipline of Anatomy and Histology (F13), University of Sydney, Sydney, NSW, Australia; 2School of Environment and Science, Griffith University, Nathan, QLD, Australia; 3Discipline of Medicine, Nepean Clinical School, Faculty of Medicine and Health, University of Sydney, Kingswood, NSW, Australia; 4New South Wales Brain Tissue Resource Centre, School of Medical Sciences, Faculty of Medicine and Health, University of Sydney, Charles Perkins Centre (D17), Sydney, NSW, Australia
  • Online:2024-02-15 Published:2023-08-30
  • Contact: Michael W. Weible II, PhD, m.weible@griffith.edu.au; Tailoi Chan-Ling, PhD, tailoi.chan-ling@outlook.com.
  • Supported by:
    This work was supported by grants from the National Health and Medical Research Council (NHMRC) of Australia (Nos. 571100 and 1048082) and the Baxter Charitable Foundation (to TCL); Medical Research grants from the Rebecca L. Cooper Medical Research Foundation (to MWW, TCL, and MDL); MDL was supported by a Charles D. Kelman, M.D. Postdoctoral Award (2010) from the International Retinal Research Foundation (USA).

摘要:

在脊髓发育过程中,顶板分泌的骨形态发生蛋白定向了感觉神经元的命运,包括上行感觉柱的形成,尽管它们的生物学特性还不是很清楚。II型骨形态发生蛋白受体是同源受体,在胚胎发育过程中由神经前体细胞表达;然而,从胎儿脊髓中富集II型骨形态发生蛋白受体阳性神经前体细胞的体外方法并不存在。免疫荧光检测发现,II型骨形态发生蛋白受体免疫荧光表达最高的区域定位在胎龄2个月的胎儿脊髓感觉柱上。在完整的胎儿脊髓和皮质中,CD34/CD39共定位检测确定了实质和脑膜相关的II型骨形态发生蛋白受体阳性血管细胞。白血病抑制因子免疫染色确定了集中在背角和腹角神经元中的体细胞群。白血病抑制因子补充和高密度培养相结合,使培养物生长传代超过10代,同时协同增加了具有分层细胞结构的神经球的比例。这些神经球的特点是II型骨形态发生蛋白受体+/MAP2ab+/–/βIII-tubulin+/nestin–/vimentin–/GFAP–/NeuN–神经前体细胞围绕着βIII-管蛋白+/nestin+/vimentin+/GFAP+/MAP2ab-/NeuN-多能前体的异质核心。源自三潜能神经球的分离培养物含有神经元(βIII-管蛋白+)、星形细胞(GFAP+)和少突胶质细胞(O4+)谱系细胞。荧光激活细胞分选筛选的II型骨形态发生蛋白受体阳性 神经前体细胞是MAP2ab+/–/βIII-tubulin+/GFAP–/O4– 。这是首次在人类胎儿脊髓中分离出的II型骨形态发生蛋白受体阳性神经前体细胞,并对其进行了定性。结果显示,白血病抑制因子与高密度再聚集培养物协同作用,支持神经球的器官型重组,由表面II型骨形态发生蛋白受体阳性神经前体细胞表征。实验提供的体外模型能够扩增10代以上的人类胎儿脊髓细胞数量。II型骨形态发生蛋白受体在脊髓发育中的作用的研究主要依赖于小鼠和大鼠模型,通过推断得出人类发育的特性。由于小鼠生物学和人类之间的显著物种差异,包括中枢神经系统结构的解剖差异,在小鼠模型中的发现不能被认为适用于人类脊髓发育。出于这些原因,实验中的体外模型为更好地理解神经发育途径提供了一种新的工具,包括骨形态发生蛋白信号,以及脊髓损伤研究和药物治疗测试。

https://orcid.org/0000-0001-8733-2654 (Michael W. Weible II); https://orcid.org/0000-0002-8225-3671 (Tailoi Chan-Ling)

Abstract: Roof plate secretion of bone morphogenetic proteins (BMPs) directs the cellular fate of sensory neurons during spinal cord development, including the formation of the ascending sensory columns, though their biology is not well understood. Type-II BMP receptor (BMPRII), the cognate receptor, is expressed by neural precursor cells during embryogenesis; however, an in vitro method of enriching BMPRII+ human neural precursor cells (hNPCs) from the fetal spinal cord is absent. Immunofluorescence was undertaken on intact second-trimester human fetal spinal cord using antibodies to BMPRII and leukemia inhibitory factor (LIF). Regions of highest BMPRII+ immunofluorescence localized to sensory columns. Parenchymal and meningeal-associated BMPRII+ vascular cells were identified in both intact fetal spinal cord and cortex by co-positivity with vascular lineage markers, CD34/CD39. LIF immunostaining identified a population of somas concentrated in dorsal and ventral horn interneurons, mirroring the expression of LIF receptor/CD118. A combination of LIF supplementation and high-density culture maintained culture growth beyond 10 passages, while synergistically increasing the proportion of neurospheres with a stratified, cytoarchitecture. These neurospheres were characterized by BMPRII+/MAP2ab+/–/βIII-tubulin+/nestin–/vimentin–/GFAP–/NeuN– surface hNPCs surrounding a heterogeneous core of βIII-tubulin+/nestin+/vimentin+/GFAP+/MAP2ab–/NeuN– multipotent precursors. Dissociated cultures from tripotential neurospheres contained neuronal (βIII-tubulin+), astrocytic (GFAP+), and oligodendrocytic (O4+) lineage cells. Fluorescence-activated cell sorting-sorted BMPRII+ hNPCs were MAP2ab+/–/βIII-tubulin+/GFAP–/O4– in culture. This is the first isolation of BMPRII+ hNPCs identified and characterized in human fetal spinal cords. Our data show that LIF combines synergistically with high-density reaggregate cultures to support the organotypic reorganization of neurospheres, characterized by surface BMPRII+ hNPCs. Our study has provided a new methodology for an in vitro model capable of amplifying human fetal spinal cord cell numbers for > 10 passages. Investigations of the role BMPRII plays in spinal cord development have primarily relied upon mouse and rat models, with interpolations to human development being derived through inference. Because of significant species differences between murine biology and human, including anatomical dissimilarities in central nervous system (CNS) structure, the findings made in murine models cannot be presumed to apply to human spinal cord development. For these reasons, our human in vitro model offers a novel tool to better understand neurodevelopmental pathways, including BMP signaling, as well as spinal cord injury research and testing drug therapies.

Key words: BMPRII, bone morphogenetic protein, histotypic, human spinal cord development, leukemia inhibitory factor, neurosphere, organotypic,  , reaggregate, sensory columns