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Simultaneous Imaging of Microglial Dynamics and Neuronal Activity in Awake Mice
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Kilohertz two-photon brain imaging in awake mice
Tong Zhang1,2, Oscar Hernandez2, Radosław Chrapkiewicz2
1James H. Clark Center, Stanford University, Stanford, CA, USA.
Nature Methods
|October 30, 2019
Summary
Researchers developed a high-speed two-photon microscope capable of imaging at 1 kHz. This advanced microscopy technique allows for millisecond-scale visualization of fast biological processes in the brain.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Microscopy
Background:
- Two-photon microscopy is crucial for imaging in scattering media.
- Conventional two-photon microscopes typically offer frame rates of 10-30 Hz, limiting the study of rapid biological events.
Purpose of the Study:
- To develop a novel two-photon microscope with significantly enhanced acquisition rates.
- To enable millisecond-scale temporal resolution for imaging fast phenomena in vivo.
Main Methods:
- Engineered a two-photon microscope utilizing 400 parallel illumination beams.
- Achieved collective area sampling of 95,000–211,000 µm².
- Operated the microscope at acquisition rates up to 1 kHz.
Main Results:
- Successfully visualized microcirculatory flow dynamics in real-time.
- Captured rapid venous constrictions with high temporal precision.
- Recorded neuronal calcium (Ca²⁺) spiking activity at millisecond resolution in awake mice.
Conclusions:
- The developed high-speed two-photon microscope overcomes the temporal limitations of conventional systems.
- This technology provides unprecedented insight into fast physiological and neurological processes in vivo.
- Enables advanced research in brain function and disease mechanisms requiring millisecond-scale resolution.
