中国神经再生研究(英文版) ›› 2025, Vol. 20 ›› Issue (5): 1431-1444.doi: 10.4103/NRR.NRR-D-23-01471

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

MET 受体酪氨酸激酶促进成人大脑皮质回路中功能性突触的生成

  

  • 出版日期:2025-05-15 发布日期:2024-10-31
  • 基金资助:
    美国国立卫生研究院/美国国立卫生研究院(NIH/NIMH)R01MH111619、R21AG078700; 美国心理健康研究所(IMHR,1级资助)以及亚利桑那大学(SQ)的机构启动基金

MET receptor tyrosine kinase promotes the generation of functional synapses in adult cortical circuits

Yuehua Cui 1 , Xiaokuang Ma1 , Jing Wei 1 , Chang Chen1 , Neha Shakir 1 , Hitesch Guirram1 , Zhiyu Dai 2 , Trent Anderson1 , Deveroux Ferguson1 , Shenfeng Qiu1, *    

  1. 1 Basic Medical Sciences, University of Arizona College of Medicine-Phoenix, Phoenix, AZ, USA;  2 Department of Medicine, University of Arizona College of Medicine-Phoenix, Phoenix, AZ, USA
  • Online:2025-05-15 Published:2024-10-31
  • Contact: Shenfeng Qiu, PhD, sqiu@arizona.edu.
  • Supported by:
    This study was supported by NIH/NIMH grant R01MH111619 (to SQ), R21AG078700 (to SQ); Instttute of Mental Health Research (IMHR, Level 1 funding, to SQ and DF); and instttutton startup fund from The University of Arizona (to SQ).

摘要:

大脑回路中突触和功能连接的丧失与衰老和神经退行性病变有关,然而,关于促进突触发生或增强突触功能的分子机制则知之甚少。作者既往的研究已经证实,发育中的大脑皮质回路MET受体酪氨酸激酶能促进树突生长和树突棘形态发生。为了解增强成人大脑皮质中的 MET 是否具有突触再生潜力,实验在一个基因敲入小鼠品系中,通过喂饲含强力霉素的饲料在成体鼠(鼠龄10-12 个月)大脑皮质神经元中开启人类 MET 基因(hMET)的表达和信号转导。结果显示,与发育中的大脑类似,开启成体大脑皮质中的 MET 信号可激活小 GTP 酶,并增加前额叶投射神经元的树突棘密度。突触活动的增加和未成熟沉默突触的短暂生成进一步证实了这些结果。延长的 MET 信号传导导致 AMPA/NMDA 受体电流比增加,这表明突触功能和连接性增强。以上结果表明,增强 MET 信号传导可作为一种干预方法,促进突触生成并保持成人大脑的功能连接,其可能会对衰老和神经退行性疾病的新再生疗法的开发产生影响。

https://orcid.org/0000-0002-0730-1602 (Shenfeng Qiu)

Abstract:

Loss of synapse and functional connectivity in brain circuits is associated with aging and neurodegeneration, however, few molecular mechanisms are known to intrinsically promote synaptogenesis or enhance synapse function. We have previously shown that MET receptor tyrosine kinase in the developing cortical circuits promotes dendritic growth and dendritic spine morphogenesis. To investigate whether enhancing MET in adult cortex has synapse regenerating potential, we created a knockin mouse line, in which the human MET gene  expression and signaling can be turned on in adult (10–12 months) cortical neurons through doxycycline-containing chow. We found that similar to the developing brain, turning on MET signaling in the adult cortex activates small GTPases and increases spine density in prefrontal projection neurons. These findings are further corroborated by increased synaptic activity and transient generation of immature silent synapses. Prolonged MET signaling resulted in an increased α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid/N-methyl-D-aspartate (AMPA/NMDA) receptor current ratio, indicative of enhanced synaptic function and connectivity. Our data reveal that enhancing MET signaling could be an interventional approach to promote synaptogenesis and preserve functional connectivity in the adult brain. These findings may have implications for regenerative therapy in aging and neurodegeneration conditions. 

Key words:

aging, circuit connectivity, cortical circuits, molecular mechanisms, neural regeneration, neurodegeneration, synapses