Spatial Mutation of Membrane Protein Assembly Dynamics Using Nano-Actuators

描述（由申请方提供）：血管生成素通过配体诱导的Tie2受体组装和易位刺激内皮细胞（EC）的促血管生成信号，并调节EC中的几个关键过程，包括增殖、迁移和组装。然而，目前还不清楚这些生物分子调节剂如何协调高度复杂的形态发生，如血管发芽，迁移，分支和网络形成。为了理解具有高时空复杂性的血管生成的分子机制，必须以高分辨率实时监测Tie2的时空动态。在这里，我提出了一个创新的方法来研究动态组装和空间分布的变化Tie2使用一个新的磁等离子体纳米致动系统。与传统的显微镜，只提供了一个静态的细胞状态的评估，建议的系统允许我们可视化的信号分子的生物分子事件在整个血管生成期间，以及在整个形态发生的发展。此外，通过使用纳米致动系统的磁镊子能力， 这是可能的，使得研究空间极化Tie2分布如何影响细胞的行为和命运成为可能。通过这项新技术，我将具体挑战以下问题： 1. Tie2的组装状态和分布在用各种配体如血管生成素刺激后是如何变化的？2. Tie2的组装状态是否与不同的亚细胞位置有关，如细胞周边，细胞与细胞接触，细胞与基质接触？3. Tie2的空间极化分布如何影响细胞的行为？

DESCRIPTION (provided by applicant): Angiopoietins stimulate proangiogenic signals of endothelial cells (ECs) via ligand-induced assembly and translocation of Tie2 receptors and modulate several key processes in ECs including proliferation, migration, and assembly. However, it is still unclear how these biomolecular regulators coordinate highly complex morphogenesis such as vascular sprouting, migration, branching, and network formation. To understand molecular mechanisms of angiogenesis with high spatio-temporal complexity, the spatiotemporal dynamics of Tie2 must be monitored in real-time with high resolution. Here, I propose an innovative approach to investigate dynamic assembly and spatial distribution changes of Tie2 using a new magneto-plasmonic nano-actuation system. Unlike conventional microscopy that only provides a static assessment of cell status, the proposed system allows us to visualize biomolecular events of the signaling molecules continuously over the entire angiogenesis period as well as throughout morphogenetic development. Additionally, by using magnetic tweezing capability of the nano-actuation system, control of Tie2 spatial distributions is possible, enabling the study of how spatially polarized Tie2 distribution influences the cell's behavior and fate. With this new technique, specifically, I will challenge the following questions: 1. How do the assembly state and distribution of Tie2 change after stimulation with various ligands such as angiopoietins? 2. Are the assembly states of Tie2 related to the different subcellular locations such as cell periphery, cell-to-cell contacts, and cell-to-substratum contacts? 3. How do spatially polarized distributions of Tie2 influence a cell's behavior?