使用超分辨率显微镜在生长中识别z轴的filopodia
Motohiro Nozumi1, Yuta Sato1, Miyako Nishiyama-Usuda1
1Department of Neurochemistry and Molecular Cell Biology, School of Medicine, and Graduate School of Medical/Dental Sciences, Niigata University, Niigata, Japan.
Journal of neurochemistry
|July 1, 2024
概括
研究人员在生长中发现了新的"z-filopodia",这对神经发育至关重要. 这些结构不同于传统的filopodia,由actin蛋白调节,并参与轴突引导受体动态.
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
- 显微镜的使用方法
背景情况:
- 增长对于轴突延伸和神经网络形成至关重要.
- 传统的光显微镜在解决纳米尺度分子动力学在生长内的局限性.
研究的目的:
- 用超分辨率显微镜研究生长内的分子动力学.
- 识别和描述参与轴突引导的新型结构.
主要方法:
- 三维结构照明显微镜 (3D-SIM)
- 活细胞成像成像技术
- 操纵活性蛋白调节蛋白 (例如,可菲林不活化)
- 免疫光用于受体局部化.
主要成果:
- 发现了"z-filopodia",一种新型的filopodia,在生长中沿z轴定向.
- Z-filopodia表现出快速的周转率,受到actin蛋白 (VASP,fascin,cofilin) 的调节,并且独立于微管入侵.
- 轴突导向受体神经皮林-1集中在z-filopodia中,并与其连接体semaphorin-3A相互作用.
- Z-filopodia 膜域类似于脂质,并且与神经皮林-1 的行为有关.
结论:
- Z-filopodia具有独特的动态特性和周转率.
- 与xy-filopodia不同,z-filopodia似乎不起作用于为轴突延伸产生力.
- Z-filopodia 在轴突指导分子的运输和定位中发挥作用,例如神经平素-1.
相关概念视频
01:39Mechanism of Filopodia Formation
2.3K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
2.3K
01:37Super-resolution Fluorescence Microscopy
6.9K
Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
6.9K
01:17Studying the Cytoskeleton
5.9K
The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
5.9K