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通过使用FIB-SEM进行体积电子成像,近距离观察囊泡ER出口部位

Athul Nair¹, Akhil Nair¹, Patrick Stock¹

¹Program in Cellular and Molecular Medicine, Boston Children's Hospital , Boston, MA, USA.

The Journal of cell biology

|October 31, 2025

概括

这项研究可视化了ER出口点 (ERES),揭示了各种囊泡集群与管状结构一起. 这解决了理解早期的秘密路径组织的矛盾.

科学领域:

细胞生物学细胞生物学
分子生物学分子生物学
显微镜的使用方法

背景情况:

对于蛋白质分泌至关重要的ER退出部位 (ERES) 的精确架构仍在争论中,模型提出了囊泡状集群或管状结构.
现有的ERES描述缺乏清晰度,部分原因是由于过度表达分泌载荷等方法,可能会改变本地结构.

研究的目的:

澄清在没有分泌载荷过度表达的细胞中ER退出部位 (ERES) 的形态和组织.
通过使用先进的成像和分析技术来解决ERES架构的相互矛盾描述.

主要方法:

在高压冷置换细胞上利用大规模体积聚焦离子束扫描电子显微镜 (FIB-SEM).
开发并应用EM (ASEM) 中的自动化细分,用于检测COPI囊泡的3DU-Net管道.
分析了HeLa,SVG-A和iPSC衍生的神经元中的ERES结构.

主要成果:

确定了5-40个较大的囊泡 (65-85nm) 的丰富集群,位于与平坦的ER域相邻的狭窄区域,与囊泡ERES一致.
观察到与管状网络和从扩大的ER域延伸的变形体相关的类似囊泡组合.
证明了囊泡ERES在不同细胞类型中的广泛存在和形态多样性.

结论:

膀ER出口点 (ERES) 是早期分泌途径的常见和形态多样化的特征.
这些发现与之前关于ERES架构的矛盾观察相协调.
提供了对蛋白质分泌中的初始膜重塑事件的更清晰的理解.

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