在神经肌肉突触组织和目标选择中的跨突触 Teneurin 信号传递
Timothy J Mosca1, Weizhe Hong, Vardhan S Dani
1Department of Biology, Howard Hughes Medical Institute, Stanford University, Stanford, California 94305, USA. tmosca@stanford.edu
Nature
|March 20, 2012
概括
黑色素对于组织Drosophila的神经肌肉突触至关重要. 这些蛋白质协调突触前和突触后结构,确保正确的突触组装和功能,甚至指导目标选择.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 发育生物学 发展生物学
背景情况:
- 突触组装依赖于跨突触信号,但关键的组织分子尚未完全理解.
- 黑色素是保存的跨膜蛋白质,具有很大的细胞外域,具有表皮生长因子 (EGF) -重复.
研究的目的:
- 为了研究多索菲拉黑色素 (Ten-m和Ten-a) 在神经肌肉突触组织和标选择中的作用.
- 阐明 Teneurins 促进突触发育的分子机制.
主要方法:
- 使用Drosophila melanogaster作为一个模型生物.
- 对Ten-m和Ten-a进行遗传分析,包括扰动研究.
- 研究了蛋白质相互作用,特别是Ten-m和α-Spectrin之间的相互作用.
- 使用显微镜和电生理学检查突触结构和功能.
主要成果:
- 十-a是前突触的,而十-m是后突触的,在体内形成一个复合体.
- 尿干扰导致严重的突触损失,组织障碍 (活性区域,释放部位,膜,囊泡) 和突触传输缺陷.
- 黑色素破坏了前突触微管和后突触谱细胞骨.
- 十-m与α-Spectrin进行物理相互作用.
- 黑色素和神经蛋白在突触组装中具有协同作用.
- 升高的Ten-m水平调节运动神经元和肌肉目标选择.
结论:
- 黑色素作为关键的双向跨突触信号,对总体突触组织起到至关重要的作用.
- 黑色素组织细胞骨,影响突触发育.
- 氨酸蛋白还可以调节神经发育期间的目标选择.
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