植物细胞质膜有序性的活细胞定量分析

doi:10.11983/CBB24040

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

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^,^*()

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/Abstract

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

陈秀秀, 唐玲, 胡文佳, 杨照麟, 邓馨, 王晓华. 植物细胞质膜有序性的活细胞定量分析. 植物学报, 2025, 60(1): 90-100.

Xiuxiu Chen, Ling Tang, Wenjia Hu, Zhaolin Yang, Xin Deng, Xiaohua Wang. Quantitative Analysis of Plasma Membrane Order in Live Plant Cells. Chinese Bulletin of Botany, 2025, 60(1): 90-100.

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链接本文: https://www.chinbullbotany.com/CN/10.11983/CBB24040

https://www.chinbullbotany.com/CN/Y2025/V60/I1/90

图/表 5

图1 PA探针标记拟南芥根细胞质膜的发射光谱分析 (A) 拟南芥根细胞中PA探针的发射光谱特征(Lo phase: 液态有序相; Ld phase: 液态无序相); (B) PA标记的拟南芥根细胞的绿色通道(500-550 nm)荧光成像(液态有序相, Lo); (C) PA标记的拟南芥根细胞的红色通道(580-700 nm)荧光成像(液态无序相, Ld) (白色箭头指示内体); (D) 绿色(B)通道与红色(C)通道的叠加图像(蓝色箭头指示内体); (E) 双通道图像对应的色相-饱和度-亮度(Hue-Saturation-Brightness, HSB)图像。Bars=10 μm

Figure 1 Emission spectrum analysis of the plasma membrane in Arabidopsis root cells labeled with PA (A) Fluorescence spectra of PA in Arabidopsis root cells (Lo phase: Liquid ordered phase; Ld phase: Liquid disordered phase); (B) Green channel (500-550 nm) imaging of PA-labeled Arabidopsis root cells (liquid ordered phase, Lo); (C) Red channel (580-700 nm) imaging of PA-labeled Arabidopsis root cells (liquid disordered phase, Ld) (white arrows indicate the presence of endosomes); (D) The merged image of green (B) and red (C) channels (blue arrows indicate the presence of endosomes); (E) Hue-Saturation-Brightness (HSB) image corresponding to the two-channel image. Bars=10 μm

图2 拟南芥根中细胞不同切面(Z-stack)的有序度分析 (A) 拟南芥根中细胞不同切面的HSB荧光图像, 1-16所示图像代表细胞单个层面的HSB荧光图像(bars=20 μm); (B) 拟南芥根中细胞不同切面的GP值分布, 每组统计3000多个像素。

Figure 2 Analysis of membrane degree of different planes (Z-stack) in individual Arabidopsis root cells (A) HSB image of different planes (Z-stack) within individual cells of Arabidopsis roots, the images shown in 1-16 represent HSB fluorescence images of individual cell layers (bars=20 μm); (B) Distribution of GP values of different planes (Z-stack) within individual cells of Arabidopsis roots, more than 3000 pixels were analyzed for each group.

图3 PA探针标记MβCD处理及smt2/smt3双突变体拟南芥根细胞的荧光图像 (A) PA标记的野生型(WT)根细胞的荧光图像; (B) 经MβCD处理后的WT根细胞的PA标记荧光图像; (C) smt2/smt3突变体中根细胞的PA标记荧光图像。Bars=20 μm

Figure 3 Fluorescence images of Arabidopsis root cells labeled with the PA probe after MβCD treatment and in the smt2/smt3 mutant (A) Fluorescence image of wild type (WT) root cells labeled with PA; (B) Fluorescence image of WT root cells labeled with PA probe after treatment with MβCD; (C) Fluorescence image of root cells in the smt2/smt3 mutant labeled with PA probe. Bars=20 μm

图4 甾醇缺失对拟南芥根细胞膜微区均一化极性数值定量分析和比较 (A) PA探针检测野生型(WT)、MβCD处理后的WT和smt2/smt3双突变体的GP图像(bars=10 μm); (B) 野生型拟南芥根细胞质膜有序度的GP分布曲线; (C) MβCD处理的WT根细胞质膜有序度的GP分布曲线; (D) smt2/smt3双突变体根细胞质膜有序度的GP分布曲线((B)-(D)中红色曲线指示GP值分布的高斯拟合曲线; 黑色曲线显示质膜的GP峰值分布; 不同样品中质膜GP峰值标注于曲线顶部右侧; 蓝色虚线指示GP峰值的位置); (E) WT、MβCD处理的WT和smt2/smt3双突变体的GP峰值(每组6次生物学重复; ***P<0.001, Student’s t-test)。

Figure 4 Quantitative analysis and comparison of generalized polarization values of membrane microdomains in Arabidopsis root cells after sterol depletion (A) GP image of the wild type (WT), WT treated with MβCD, and smt2/smt3 double mutant using PA probe (bars=10 μm); (B) GP distribution curve for the WT membrane; (C) GP distribution curve for the WT membrane treated with MβCD; (D) GP distribution curve for the membrane of smt2/smt3 double mutant (the red curves in (B) to (D) represent the Gaussian fitting curves for the distributions of the GP values; The black curves represent the distributions of the membrane GP values; The GP peak values are shown at the top right of each curve; The blue dotted lines indicate the locations of the GP peaks); (E) GP peak values for the WT, WT treated with MβCD, and smt2/smt3 double mutant (each group was analyzed in 6 biological repetitions; *** P<0.001, Student’s t-test).

图5 野生型拟南芥和smt2/smt3双突变体根毛细胞质膜的有序度分析 (A) 野生型拟南芥根毛细胞GP和HSB荧光图像(bars=20 μm); (B) 野生型拟南芥根毛细胞质膜的GP值分布, 每组统计3000多个像素; (C) smt2/smt3突变体根毛细胞的GP和HSB荧光图像(bars=15 μm); (D) smt2/smt3突变体根毛细胞质膜的GP值分布。(B)和(D)中红色曲线为GP值分布的高斯拟合曲线; 黑色曲线代表质膜的GP值分布情况; 不同样品中质膜GP峰值标注于曲线顶部右侧; 蓝色虚线指示GP峰值的位置。

Figure 5 Quantitative analysis of the membrane order of root hair cells in wild type (WT) Arabidopsis and smt2/smt3 double mutant (A) The GP and HSB images of root hair cells in WT Arabidopsis (bars=20 μm); (B) Distribution of the GP values of the root hair cell membranes in WT Arabidopsis, more than 3000 pixels were counted for each group; (C) The GP and HSB images of root hair cells in the smt2/smt3 double mutant (bars=15 μm); (D) Distribution of the GP values of the root hair cell membranes in the smt2/smt3 double mutant. The red curves in (B) and (D) represent the Gaussian fitting curves for the distributions of the GP values; The black curves represent the distributions of the membrane GP values; The numbers indicate the GP peak values at the top right of each curve; The blue dotted lines indicate the locations of the GP peaks.

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植物细胞质膜有序性的活细胞定量分析

Quantitative Analysis of Plasma Membrane Order in Live Plant Cells

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