德洛索菲拉亚特拉斯调节突触囊泡动员,独立于骨形态遗传蛋白信号传递
Francisca Bertin1,2, Jorge Jara-Wilde3,4, Benedikt Auer5
1Biomedical Neuroscience Institute (BNI), Santiago, Chile.
Biological research
|September 14, 2023
概括
亚特拉斯 (Atl) 突变影响运动神经元突触囊泡,独立于BMP信号传递. 这项研究阐明了Atl.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 细胞内膜网膜 (ER) 与内分体接触,以在运动神经元中长途运输蛋白质和脂质.
- 亚特拉斯 (Atl) 突变是遗传性性 (HSP) 的常见原因,影响ER结构和膜融合.
- 已知Atl突变可刺激骨形态遗传蛋白 (BMP) 途径并导致突触缺陷.
研究的目的:
- 研究亚特拉斯 (Atl) 在突触囊泡 (SV) 分布和运动神经元中神经递质释放中的作用.
- 为了确定BMP信号是否介导Atl-依赖的SV异常.
- 阐明Atl突变导致突触功能障碍的机制.
主要方法:
- 在Drosophila运动神经元中的Atl Knockdown (Atl-KD).
- 对突触结节数和SV蛋白丰度 (CSP,VGLUT) 的分析.
- 对BMP信号通路组件的基因操纵 (Tkv, wit).
- 评估活动依赖的蛋白质分布和FM 1-43的吸收.
- 调查Rab11/CSP的局部化情况.
主要成果:
- 亚特尔 knockdown 副本 BMP 受体激活在增加的扣子数.
- 在Atl-KD和Tkv-CA幼虫中,SV蛋白CSP和VGLUT被降低.
- 减少BMP受体"愿望思维" (wit) 功能可以拯救Atl-KD表型.
- 与Tkv-CA不同的是,Atl-KD幼虫显示了活动依赖的CSP分布变化和FM 1-43吸收增加.
- 在Atl-KD中,Rab11/CSP同位化增加,这表明晚期内分泌体参与.
结论:
- 亚特拉斯通过SV分布调节神经递质释放,独立于BMP信号传递.
- Atl参与了膜流通和晚期内分泌体的形成/循环.
- 这些发现解释了ATL相关疾病中的SV积累和突触功能障碍.
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