中国神经再生研究(英文版) ›› 2024, Vol. 19 ›› Issue (4): 863-871.doi: 10.4103/1673-5374.382254

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

过表达Rbm8a增强5xFAD小鼠海马齿状回神经发生

  

  • 出版日期:2024-04-15 发布日期:2023-09-15

Rbm8a regulates neurogenesis and reduces Alzheimer’s disease-associated pathology in the dentate gyrus of 5×FAD mice

Chenlu Zhu1, #, Xiao Ren2, #, Chen Liu3, Yawei Liu4, *, Yonggang Wang1, 5, *   

  1. 1Department of Neurology, Lanzhou University Second Hospital, Lanzhou, Gansu Province, China; 2Department of Neurology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi Province, China; 3Department of Neurology, Xiaogan City Central Hospital, Xiaogan, Hubei Province, China; 4Health Service Department of the Guard Bureau of the General Office of the Central Committee of the Communist Party of China, Beijing, China; 5Headache Center, Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
  • Online:2024-04-15 Published:2023-09-15
  • Contact: Yonggang Wang, MD, PhD, w100yg@gmail.com; Yawei Liu, MD, Ph.D., 18101116733@139.com.
  • Supported by:
    This study was supported by the National Natural Science Foundation of China, No. 91849104 (to YW).

摘要:

阿尔茨海默病导致患者进行性认知能力下降的部分原因在于海马神经生成受损。最近的证据表明,Rbm8a促进了神经祖细胞的增殖,但与健康人相比,阿尔茨海默病患者的表达水平较低。实验假设Rbm8a的过表达可能通过促进神经祖细胞的增殖来增强神经发生,并改善阿尔茨海默病的认知功能障碍。因此,实验试图通过在阿尔茨海默病模型5xFAD小鼠大脑的齿状回中诱导Rbm8a的过表达来验证这一假说,结果发现齿状回中Rbm8a基因过表达触发了神经发生,抑制了淀粉样蛋白沉积和老年斑块形成,同时缓解了神经胶质增生反应,以及营养不良神经突起的形成,从而改善了5xFAD小鼠的记忆功能。总之,Rbm8a基因可调控神经发生,为阿尔茨海默病的治疗提供了新的靶点选择。

https://orcid.org/0000-0001-5587-1928 (Yonggang Wang); https://orcid.org/0009-0001-3312-7468 (Yawei Liu)

Abstract: Alzheimer’s disease is a prevalent and debilitating neurodegenerative condition that profoundly affects a patient’s daily functioning with progressive cognitive decline, which can be partly attributed to impaired hippocampal neurogenesis. Neurogenesis in the hippocampal dentate gyrus is likely to persist throughout life but declines with aging, especially in Alzheimer’s disease. Recent evidence indicated that RNA-binding protein 8A (Rbm8a) promotes the proliferation of neural progenitor cells, with lower expression levels observed in Alzheimer’s disease patients compared with healthy people. This study investigated the hypothesis that Rbm8a overexpression may enhance neurogenesis by promoting the proliferation of neural progenitor cells to improve memory impairment in Alzheimer’s disease. Therefore, Rbm8a overexpression was induced in the dentate gyrus of 5×FAD mice to validate this hypothesis. Elevated Rbm8a levels in the dentate gyrus triggered neurogenesis and abated pathological phenotypes (such as plaque formation, gliosis reaction, and dystrophic neurites), leading to ameliorated memory performance in 5×FAD mice. RNA sequencing data further substantiated these findings, showing the enrichment of differentially expressed genes involved in biological processes including neurogenesis, cell proliferation, and amyloid protein formation. In conclusion, overexpressing Rbm8a in the dentate gyrus of 5×FAD mouse brains improved cognitive function by ameliorating amyloid-beta-associated pathological phenotypes and enhancing neurogenesis.

Key words: Adora2a, Alzheimer’s disease, astrocyte, cAMP signaling pathway, dentate gyrus, dystrophic neurites, microglia, neurogenesis, plaque, Rbm8a