研究目的
开发一种光遗传学调控的膜受体-配体对,以利用光精确控制整合素-基质相互作用。
研究成果
光控整合素-光控基质系统成功实现了对细胞-基质相互作用及下游机械传感通路激活的光调控,为以高时空精度研究整合素信号传导提供了新工具。
研究不足
该系统针对工程化整合素与基质对特异设计;可能无法完全复现天然整合素信号传导的复杂性。若要更广泛适用于其他受体-配体对,尚需优化。
1:实验设计与方法选择:
本研究利用拟南芥中的光敏色素B(PhyB)和光敏色素相互作用因子6(PIF6)设计了一套光遗传学系统,用于调控整合素-基质相互作用。其原理是实现光诱导且可逆的结合。
2:样本选择与数据来源:
使用稳定表达工程化整合素的人源细胞系(HEK-293T、HeLa、MCF7)。数据通过流式细胞术、显微镜观察和蛋白质印迹法获取。
3:3T、HeLa、MCF7)。数据通过流式细胞术、显微镜观察和蛋白质印迹法获取。 实验设备与材料清单:
3. 实验设备与材料清单:包括载玻片、用于照明的LED灯、染色抗体以及PhyB1-651等重组蛋白。
4:实验流程与操作步骤:
将细胞转染或转导整合素构建体,接种于包被PhyB的基质上,用660纳米或740纳米光照处理,并分析其黏附、铺展及信号通路激活情况。
5:数据分析方法:
统计分析采用Cochran-Mantel-Haenszel检验、卡方检验和Welch检验;成像数据通过Fiji和OpenCV软件处理。
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LED
LED660N-03
Roithner LaserTechnik
Illumination at 660 nm wavelength for activating the optogenetic system.
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LED
H2A1-H740
Roithner LaserTechnik
Illumination at 740 nm wavelength for deactivating the optogenetic system.
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LED
LED740-01AU
Roithner LaserTechnik
Illumination at 740 nm wavelength.
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Microscope
Axio Observer Z1/7
Zeiss
Imaging of cells during experiments.
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Spectrometer
AvaSpec-ULS2048
Avantes BV
Measurement of light intensities and spectra.
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Confocal Microscope
Eclipse Ni-E with C2 confocal laser scanner
Nikon Instruments
Confocal imaging for immunostaining analysis.
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Antibody
A2102
Thermo Fisher
Secondary antibody Alexa Fluor 488-labelled donkey anti-mouse IgG for fluorescence detection.
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Antibody
A-21244
Thermo Scientific
Secondary antibody Alexa Fluor 647-labelled goat anti-rabbit IgG for fluorescence detection.
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NeutrAvidin
31050
Thermo Scientific
Coating agent for glass slides to bind biotinylated PhyB1-651.
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LED
LH W5Am
Osram Opto Semiconductors
Illumination at 660 nm wavelength.
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LED
L-53SR
Kingbright Electronic
Illumination at 660 nm wavelength.
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LED
LZ4-00R308
LED Engin
Illumination at 740 nm wavelength.
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Microscope
EVOS Xl
Fisher Scientific
Transmitted light microscopy for cell imaging.
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Flow Cytometer
GALLIOS
Beckman Coulter
Analysis of cell fluorescence and surface expression.
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Cell Sorter
S3e
Bio-Rad
Fluorescence-activated cell sorting for selecting high-expressing cells.
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Imaging System
ImageQuant LAS-4000 mini
GE Healthcare
Detection of chemiluminescence in western blotting.
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Glass Bottom Dish
81158
IBIDI
Container for live cell imaging experiments.
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Dialysis Tube
SnakeSkin
Fisher Scientific
Dialysis of proteins like PhyB1-651.
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Antibody
H9658
Sigma
Primary antibody for detecting HA tag in western blotting and flow cytometry.
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Antibody
HPA051309
Atlas Antibodies
Primary antibody for paxillin staining.
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