中国神经再生研究(英文版) ›› 2025, Vol. 20 ›› Issue (9): 2645-2654.doi: 10.4103/NRR.NRR-D-23-01628

• 原著:退行性病与再生 • 上一篇    下一篇

淀粉样β蛋白介导的人类多能干细胞神经元抑制作用与 Nogo 信号通路有关

  

  • 出版日期:2025-09-15 发布日期:2024-12-30

Modulation of the Nogo signaling pathway to overcome amyloid-β-mediated neurite inhibition in human pluripotent stem cell–derived neurites

Kirsty Goncalves1 , Stefan Przyborski1, 2, *   

  1. 1 Department of Biosciences, Durham University, Durham, UK;  2 Reprocell Europe Ltd., Glasgow, UK
  • Online:2025-09-15 Published:2024-12-30
  • Contact: Stefan Przyborski, PhD, stefan.przyborski@durham.ac.uk.
  • Supported by:
    This study was supported by a BBSRC CASE training studentship, No. BB/K011413/1 (to KG).

摘要:


神经细胞死亡和连接性丢失是阿尔茨海默病(AD)的主要病理机制之一。淀粉样β蛋白(Aβ)的积累是阿尔茨海默病的一个主要特征,它被认为会诱发神经细胞异常,如生长减少、延伸和生长锥形态异常,所有这些都会导致连接性降低。然而,在细胞和分子水平上支配这种反应的确切机制仍然未知。实验采用一种创新方法证明 Aβ 在二维和三维培养系统中对神经元动态的影响,以提供一种更符合生理的培养几何形状。实验采用的多种方法包括在培养基中添加外源性 Aβ 、生长基质涂层以及使用人类诱导多能干细胞 (iPSC) 技术,来探索内源性 Aβ 分泌对神经元生长的作用,从而为未来个性化医疗的应用提供空间。实验还探索了 Aβ 诱导的神经元抑制过程中 Nogo 信号级联的参与。结果显示,通过分别使用 Y-2732 和布洛芬调节Nogo信号通路下游 ROCK和RhoA,可以在 Aβ 存在的情况下恢复甚至增强神经元的连通性。总之,这项研究使人们有可能深入了解神经元生长和抑制的生物学过程,又提出了在 Aβ存在下神经连接性降低的特定机制,并提出了可恢复神经元生长的干预靶点。


https://orcid.org/0000-0001-7613-525X (Stefan Przyborski)

Abstract: Neuronal cell death and the loss of connectivity are two of the primary pathological mechanisms underlying Alzheimer’s disease. The accumulation of amyloid-β peptides, a key hallmark of Alzheimer’s disease, is believed to induce neuritic abnormalities, including reduced growth, extension, and abnormal growth cone morphology, all of which contribute to decreased connectivity. However, the precise cellular and molecular mechanisms governing this response remain unknown. In this study, we used an innovative approach to demonstrate the effect of amyloid-β on neurite dynamics in both two-dimensional and three-dimensional culture systems, in order to provide more physiologically relevant culture geometry. We utilized various methodologies, including the addition of exogenous amyloid-β peptides to the culture medium, growth substrate coating, and the utilization of human-induced pluripotent stem cell technology, to investigate the effect of endogenous amyloid-β secretion on neurite outgrowth, thus paving the way for potential future applications in personalized medicine. Additionally, we also explore the involvement of the Nogo signaling cascade in amyloid-β-induced neurite inhibition. We demonstrate that inhibition of downstream ROCK and RhoA components of the Nogo signaling pathway, achieved through modulation with Y-27632 (a ROCK inhibitor) and Ibuprofen (a Rho A inhibitor), respectively, can restore and even enhance neuronal connectivity in the presence of amyloid-β. In summary, this study not only presents a novel culture approach that offers insights into the biological process of neurite growth and inhibition, but also proposes a specific mechanism for reduced neural connectivity in the presence of amyloid-β peptides, along with potential intervention points to restore neurite growth. Thereby, we aim to establish a culture system that has the potential to serve as an assay for measuring preclinical, predictive outcomes of drugs and their ability to promote neurite outgrowth, both generally and in a patient-specific manner.

Key words: Alzheimer’s disease,  induced pluripotent stem cell,  neurite outgrowth,  neuron,  Nogo,  Rho A,  ROCK,  stem cell,  three-dimensional culture