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Live-cell superresolution imaging by pulsed STED two-photon excitation microscopy
Kevin T Takasaki1, Jun B Ding, Bernardo L Sabatini
1Howard Hughes Medical Institute, Department of Neurobiology, Harvard Medical School, Boston, MA, USA.
Biophysical Journal
|February 28, 2013
Summary
This study introduces a superresolution two-photon microscope combining pulsed excitation and STED lasers. This advanced technique enhances imaging resolution in thick biological tissues, enabling detailed visualization of neuronal structures.
Area of Science:
- Neuroscience
- Microscopy
- Biophysics
Background:
- Two-photon laser scanning microscopy (2PLSM) enables deep tissue imaging but is limited by diffraction.
- Conventional 2PLSM struggles with subcellular resolution due to diffraction and light scattering.
- Stimulated emission depletion (STED) microscopy offers superresolution but is typically limited to thin samples.
Purpose of the Study:
- To develop and evaluate a superresolution two-photon microscope combining STED.
- To assess the depth-dependent resolution of STED imaging in biological tissues.
- To enable high-resolution live imaging of neuronal structures in vivo.
Main Methods:
- Integration of pulsed excitation and STED lasers into a two-photon microscope.
- Imaging of acute tissue slices to analyze depth-dependent resolution.
- Live imaging of dendritic spines in brain tissue.
Main Results:
- Achieved superresolution imaging with enhanced 2P resolution up to twofold at 90-μm depth.
- Resolution enhancement correlated with STED laser propagation efficiency in turbid tissue.
- Demonstrated live imaging of dendritic spines with 60-nm resolution up to 30-μm deep.
Conclusions:
- The developed superresolution two-photon microscope overcomes diffraction limits for deep tissue imaging.
- STED laser propagation is a key factor limiting resolution in turbid biological samples.
- This technique provides accurate quantification of neuronal morphology in living brain tissue at unprecedented resolution.
