Total internal reflection fluorescence microscopy for high-resolution imaging of cell-surface events
Jyoti K Jaiswal1, Sanford M Simon
1Rockefeller University, New York, New York, USA.
Current Protocols in Cell Biology
|January 30, 2008
Summary
Total internal reflection fluorescence microscopy (TIR-FM) overcomes light
Area of Science:
- Microscopy and imaging techniques
- Cell biology and biophysics
Background:
- Light microscopy resolution is fundamentally limited by the wavelength of light, approximately 400 nm.
- Imaging cellular structures near the surface requires high resolution and minimal damage.
Purpose of the Study:
- To describe total internal reflection fluorescence microscopy (TIR-FM) as a method to surpass the diffraction limit.
- To explain how TIR-FM enables selective imaging of fluorophores near the cell surface.
Main Methods:
- Utilizes total internal reflection of excitation light at the coverslip-cell interface.
- Confines excitation light penetration to a narrow region (evanescent wave) within 50 nm of the surface.
- Total internal reflection fluorescence microscopy (TIR-FM) is also known as evanescent wave microscopy.
Main Results:
- Achieves enhanced resolution beyond the diffraction limit for surface-near structures.
- Provides a high signal-to-noise ratio by selectively exciting fluorophores in the evanescent field.
- Minimizes photodamage to the cell by limiting excitation light penetration depth.
Conclusions:
- TIR-FM offers a powerful approach to visualize cellular components with improved resolution and reduced phototoxicity.
- This technique is particularly valuable for studying events at the cell-substrate interface.
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