中国神经再生研究(英文版) ›› 2022, Vol. 17 ›› Issue (2): 323-324.doi: 10.4103/1673-5374.317973

• 观点:脑损伤修复保护与再生 • 上一篇    下一篇

NRBF2 / PI3KC3轴在维持脑和肠内稳态中的新兴作用

  

  • 出版日期:2022-02-15 发布日期:2021-10-08

Emerging roles of NRBF2/PI3KC3 axis in maintaining homeostasis of brain and guts

Ming-Yue Wu#, Cui-Zan Cai#, Chuanbin Yang, Zhenyu Yue, Ye Chen, ZhaoXiang Bian, Min Li*, Jia-Hong Lu*#br#   

  1. State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao Special Administrative Region, China (Wu MY, Cai CZ, 
    Lu JH)
    School of Chinese Medicine, Hong Kong Baptist University, Hong Kong Special Administrative Region, China (Yang C, Bian ZX, Li M)
    Department of Neurology and Neuroscience, Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA (Yue Z)
    Department of Gastroenterology, State Key Laboratory of Organ Failure Research, Guangdong Provincial Key Laboratory of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong Province, China (Chen Y)
  • Online:2022-02-15 Published:2021-10-08
  • Contact: Jia-Hong Lu, PhD, jiahonglu@um.edu.mo; Min Li, PhD, limin@hkbu.edu.hk.
  • Supported by:
    This work was supported by the China Ministry of Science and Technology grant (No. MoST-2017YFE0120100), The Science and Technology Development Fund, Macau SAR (Nos. 024/2017/AMJ, 0128/2019/A3), and the University of Macau grant (No. MYRG2019-00129-ICMS) (to JHL). This work was also supported by GRF/HKBU (Nos. 12101417, 12100618) and HMRF (Nos. 17182541, 17182551) (to ML).

摘要: Neural Regen Res:NRBF2调节神经元稳态和肠道炎症
NRBF2已被鉴定为PI3KC3复合体的第五组分,需要维持激酶活性以促进自噬。近年研究表明,NRBF2通过调节自噬体成熟和吞噬体成熟的机制,在预防阿尔茨海默病和炎症性肠病的发生中起着重要作用。这一发现拓展了我们对PI3KC3复合物生理作用的认识,并通过调节PI3KC3复合物活性为阿尔茨海默病和炎症性肠病治疗提供了一种潜在的治疗策略。哺乳动物PI3KC3由三种核心成分蛋白PIK3、PIK3R4和BECC1组成。核心成分结合不同的蛋白质如Atg14L、UVRAG、Rubicon和Ambra1,形成PI3K33的亚组分,调节不同的细胞功能。自噬在抑制炎症中起重要作用。斑马鱼中Vps34的功能性消除发展为炎症性肠病样特征,揭示了PI3KC3复合物在维持肠道内稳态中的作用。前期研究还揭示了NRBF2在细胞凋亡清除中的生理作用,以维持肠道内稳态。NRBF2缺乏增加了小鼠对结肠炎的易感性,表现为结肠组织中大量凋亡细胞聚集和白细胞大量浸润。巨噬细胞或小鼠NRBF2缺乏导致凋亡细胞清除受损。野生型小鼠巨噬细胞过继转移可减轻DSS诱导的结肠炎和NRBF2基因敲除小鼠的细胞凋亡。临床证据进一步证实了NRBF2在溃疡性结肠炎中的调节作用。在溃疡性结肠炎患者的结肠组织中观察到较高的NRBF2表达和与巨噬细胞标记物CD68的良好共定位,提示NRBF2在溃疡性结肠炎中对巨噬细胞的重要作用。
来自中国澳门大学的Jia-Hong Lu团队认为结肠活检中的凋亡细胞计数与溃疡性结肠炎的严重程度(Mayo评分)密切相关,表明凋亡细胞的积聚与溃疡性结肠炎的发展有关。有趣的是,在NRBF2阳性细胞中可以观察到凋亡细胞碎片,这意味着NRBF2可能促进溃疡性结肠炎患者凋亡细胞的清除。总之,NRBF2可能通过促进巨噬细胞介导的凋亡细胞清除,在调节肠道炎症中发挥重要作用,因此小分子对NRBF2功能的调节可能为结肠炎的治疗提供了消除凋亡细胞的机会。研究不仅扩大了目前对NRBF2和PI3KC3复合物的生化和生理功能的了解,同时也强调了NRBF2-KO小鼠作为一种轻度系统性自噬缺陷模型的潜在价值,以探讨慢性自噬缺陷在人类慢性疾病发展中的作用。
    文章在《中国神经再生研究(英文版)》杂志2022年 2 月 2  期发表。

https://orcid.org/0000-0002-1147-125X (Jia-Hong Lu); https://orcid.org/0000-0002-7113-2700 (Min Li) 

Abstract: NRBF2 has been identified as the fifth component of PI3KC3 complex and is required for maintaining the kinase activity to promote autophagy. However, the physiological and pathological roles of NRBF2 are largely unknown. In our recent studies, we have revealed that NRBF2 plays an important role in preventing the Alzheimer’s disease (AD) and inflammatory bowel disease (IBD) development, via the mechanisms involving regulating autophagosome maturation and phagosome maturation. The findings expand our understanding towards the physiological role of PI3KC3 complex and provide a potential strategy for AD and IBD treatment by regulating PI3KC3 complex activity.