植物学报 ›› 2025, Vol. 60 ›› Issue (1): 90-100.DOI: 10.11983/CBB24040  cstr: 32102.14.CBB24040

• 技术方法 • 上一篇    下一篇

植物细胞质膜有序性的活细胞定量分析

陈秀秀1,2,3, 唐玲1,2,3, 胡文佳1,2,3, 杨照麟1,2,3, 邓馨1,2, 王晓华1,2,*()   

  1. 1中国科学院植物研究所, 植物多样性与特色经济作物全国重点实验室, 北京 100093
    2国家植物园, 北京 100093
    3中国科学院大学, 北京 100049
  • 收稿日期:2024-03-11 接受日期:2024-05-27 出版日期:2025-01-10 发布日期:2024-05-30
  • 通讯作者: * 王晓华, 副研究员, 硕士生导师。主要研究方向为植物活细胞和单分子成像技术, 致力于建立适合植物细胞膜和生物大分子的单分子研究方法, 实现生物大分子运动参数的精准分析, 从而为揭示植物细胞早期响应机制提供技术支持。E-mail: wangxh@ibcas.ac.cn
  • 基金资助:
    北京市自然科学基金(5222021);国家自然科学基金(32170412)

Quantitative Analysis of Plasma Membrane Order in Live Plant Cells

Xiuxiu Chen1,2,3, Ling Tang1,2,3, Wenjia Hu1,2,3, Zhaolin Yang1,2,3, Xin Deng1,2, Xiaohua Wang1,2,*()   

  1. 1State Key Laboratory of Plant Diversity and Special Crops, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
    2China National Botanical Garden, Beijing 100093, China
    3University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2024-03-11 Accepted:2024-05-27 Online:2025-01-10 Published:2024-05-30
  • Contact: * E-mail: wangxh@ibcas.ac.cn

摘要: 质膜微区是细胞质膜上富含甾醇和鞘磷脂的微结构域, 参与信号转导、囊泡转运、胞吞和胞吐等众多生物学过程, 因此质膜微区动态过程是植物细胞生物学研究的重要领域之一。荧光探针结合荧光显微镜被广泛应用于检测植物活细胞状态。PA (push-pull pyrene)是一种基于芘的新型、高效且稳定的荧光探针, 但在植物活细胞成像研究中应用极少。该研究利用PA探针和激光共聚焦显微镜技术, 结合图像处理和极性归一化数值作图法对拟南芥(Arabidopsis thaliana)根中活细胞质膜的有序度进行了定量分析, 发现PA探针在拟南芥根细胞质膜中的液态有序相的发射光谱为500-550 nm, 液态无序相的发射光谱为580-700 nm。使用甾醇抽提剂MβCD处理野生型拟南芥可使质膜的有序度降低。缺乏甾醇合成关键的甲基转移酶双突变体smt2/smt3质膜的有序度与经甾醇抽提剂MβCD处理的野生型株系质膜一致。smt2/smt3突变体根毛细胞质膜的有序度低于野生型, 表明甾醇作为膜微区的关键组分在调节质膜的有序度上发挥重要作用。该研究为检测植物活细胞质膜动力学特征和质膜微区变化提供了一种直观且快速的检测手段。

关键词: PA探针, 植物甾醇, 质膜微区, 活细胞荧光成像, 质膜有序性

Abstract: Membrane microdomains, which are highly dynamic structures rich in sterols and sphingolipids on the plasma membrane, play crucial roles in various biological processes such as signal transduction, vesicle transport, endocytosis, and exocytosis. Consequently, the investigation of membrane microdomain dynamics is an important area of research in plant cell biology. Fluorescence probes combined with fluorescence microscopy are widely used to monitor the status of living plant cells. The PA probe (push-pull pyrene) is a novel, highly efficient and stable fluorescence probe based on pyrene: however, its application in imaging studies of living plant cells is limited. In this study, we used PA probes and laser scanning confocal microscopy, combined with image processing and the polar normalized value mapping method, to quantitatively analyze the order of the plasma membrane in Arabidopsis root cells. The results revealed that the emission spectrum of the liquid-ordered phase in the plasma membrane of Arabidopsis root cells labeled with the PA probe ranged from 500-550 nm, whereas the emission spectrum of the liquid-disordered phase ranged from 580-700 nm. Treatment of wild-type plants with the sterol extraction agent MβCD resulted in a decrease in plasma membrane order. In the smt2/smt3 double mutant lacking the key methyltransferase in sterol synthesis, the plasma membrane order was consistent with that of the wild-type plants after treatment with MβCD. In the smt2/smt3 mutant, the plasma membrane order of the root hair cells was lower than the plasma membrane order of the wild-type root hair cells, indicating that sterols, as key components of membrane microdomains, play an important role in regulating the order of the plasma membrane. This study provides a straightforward and rapid detection method for monitoring the dynamic characteristics of living plant cell membranes and changes in membrane microdomains.

Key words: PA probe, phytosterol, membrane microdomains, live-cell fluorescence imaging, membrane order