质瘤突触招募适应性可塑性的机制
Kathryn R Taylor1, Tara Barron1, Alexa Hui1
1Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA.
Nature
|November 2, 2023
概括
由大脑衍生的神经营养因子 (BDNF) 通过增强恶性突触可塑性驱动质瘤的进展. 阻断BDNF-TrkB信号抑制瘤生长并延长质母细胞瘤模型的存活时间.
科学领域:
- 神经瘤学
- 癌症生物学
- 神经科学
背景情况:
- 神经元活动通过脑衍生神经营养因子 (BDNF) 和功能神经元到神经元突触等信号因子影响质瘤的进展.
- 由神经元活动驱动的质瘤细胞膜脱极化促进了瘤的扩散.
- 在健康的大脑中,BDNF调节突触可塑性,影响连接性和强度.
研究的目的:
- 调查恶性突触是否表现出BDNF调节的可塑性,类似于健康的大脑突触.
- 确定BDNF-TrkB信号在调节质瘤突触强度和瘤进展中的作用.
- 在质瘤治疗中探索阻断BDNF-TrkB信号的治疗潜力.
主要方法:
- 通过与氨酸相关的酶B (TrkB) 向CAMKII进行BDNF介导的信号传递.
- 在质瘤细胞中评估AMPA受体运输和谷氨酸引起的电流.
- 利用光遗传学控制质瘤膜潜力,将突触强度与增殖联系起来.
- 研究了BDNF分泌或TrkB表达对瘤进展的影响.
- 在儿科质母细胞瘤和扩散内在质母细胞瘤的异种移植模型中使用TrkB的遗传和药理阻断.
主要成果:
- 通过TrkB传递的BDNF信号促进了AMPA受体向质瘤细胞膜的传输,从而增加了谷氨酸引起的电流幅度.
- 质瘤细胞中脱极电流幅度的增加与质瘤增多相关.
- BDNF-TrkB信号调节神经元到质瘤突触的数量.
- 抑制BDNF分泌或TrkB表达显著抑制瘤的进展.
- 在临床前质瘤模型中,阻断TrkB可以延长存活时间.
结论:
- 恶性突触表现出BDNF调节的可塑性,与健康大脑中的突触可塑性共享机械特征.
- 通过促进恶性突触可塑性和增加瘤细胞增殖,BDNF-TrkB信号增强了质瘤的进展.
- 针对BDNF-TrkB途径是一种有前途的治疗策略.
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