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Updated: Jan 22, 2026
07:48
Tracking Drug-induced Changes in Receptor Post-internalization Trafficking by Colocalizational Analysis
Published on: July 3, 2015
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Single Cell Fluorescence Ratio Image Analysis for Studying ESCRT Function in Receptor Trafficking.
Jalal M Kazan1,2, Gergely L Lukacs3, Pirjo M Apaja4,5
1Department of Biochemistry, McGill University, Montréal, QC, Canada.
Methods in Molecular Biology (Clifton, N.J.)
|June 29, 2019
Summary
We developed a new live cell imaging method to study how endosomal sorting complexes required for transport (ESCRT) affect membrane trafficking and integrin alpha5beta1 receptor downregulation.
Area of Science:
- Cell Biology
- Molecular Biology
- Membrane Trafficking
Background:
- Endosomal sorting complexes required for transport (ESCRT) are crucial for protein trafficking from the plasma membrane.
- ESCRT proteins mediate ubiquitin-dependent endocytosis and are essential for various cellular processes.
- Dysregulation of ESCRT function is implicated in several diseases.
Purpose of the Study:
- To establish a novel live cell-based method for investigating ESCRT complex functions.
- To analyze the role of ESCRT in the downregulation of the integrin alpha5beta1 receptor.
- To understand the dynamics of ESCRT-mediated endo-lysosomal trafficking.
Main Methods:
- Development of a single-cell fluorescence ratio image analysis (FRIA) method.
- Utilizing specific fluorescence probes to track vesicle dynamics.
- Live cell imaging to monitor integrin alpha5beta1 containing vesicles.
Main Results:
- The FRIA method successfully measures the dynamics of integrin alpha5beta1 vesicles in live cells.
- This technique allows for the real-time assessment of ESCRT complex involvement in membrane trafficking.
- Demonstrated the utility of FRIA in studying ESCRT-dependent receptor downregulation.
Conclusions:
- Single-cell FRIA is a powerful tool for studying ESCRT-mediated endo-lysosomal trafficking.
- This method provides new insights into the role of ESCRT in regulating integrin alpha5beta1 levels.
- The developed technique facilitates live cell analysis of ubiquitin-dependent protein sorting.
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