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Visualizing Clathrin-mediated Endocytosis of G Protein-coupled Receptors at Single-event Resolution via TIRF Microscopy
Published on: October 20, 2014
Live-cell imaging of clathrin coats
Comert Kural1, Tom Kirchhausen
1Department of Cell Biology, Harvard Medical School, and Immune Disease Institute and Program in Cellular and Molecular Medicine at Children’s Hospital, Boston, Massachusetts, USA.
Methods in Enzymology
|February 1, 2012
Summary
Researchers developed a rapid 3D imaging method using spinning-disk confocal microscopy for tracking clathrin-coated carriers. This technique offers high spatial and temporal resolution for studying cellular transport mechanisms.
Area of Science:
- Cell Biology
- Microscopy Techniques
- Molecular Dynamics
Background:
- Clathrin-coated vesicles are crucial for endocytosis and intracellular trafficking.
- Understanding the dynamics of these carriers requires advanced imaging methods.
- Existing methods may lack the resolution or speed for real-time analysis.
Purpose of the Study:
- To compare 2D total internal reflection fluorescence microscopy with spinning-disk confocal microscopy for 3D imaging.
- To establish a reliable method for 3D tracking of clathrin-coated endocytic and endosomal carriers.
- To enable detailed monitoring of carrier composition and dynamics in live mammalian cells.
Main Methods:
- Utilized spinning-disk confocal microscopy for rapid 3D imaging.
- Employed fluorescently tagged clathrin proteins (e.g., enhanced green fluorescent protein - EGFP) within carriers.
- Achieved spatial precision of approximately 30 nm and temporal resolution under 1 second.
Main Results:
- Identified clathrin-containing carriers as sparse, diffraction-limited fluorescent objects.
- Demonstrated the capability for reliable 3D tracking of these carriers.
- Quantified carrier composition using approximately 20 EGFP equivalents.
Conclusions:
- Spinning-disk confocal microscopy provides a rapid and effective method for 3D imaging of clathrin-coated carriers.
- This technique facilitates detailed studies of the molecular mechanisms underlying clathrin-mediated endocytosis and vesicle trafficking.
- The approach is applicable to mammalian cells, offering insights into dynamic cellular processes.
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