Real-time luminescence imaging of cellular ATP release

Area of Science:

• Cell Biology
• Biophysics
• Neuroscience

Background:

• Extracellular adenosine triphosphate (ATP) acts as a key signaling molecule in various physiological processes.
• While purinergic signaling is well-studied, the mechanisms of ATP release remain poorly understood.
• Existing methods for imaging extracellular ATP have limitations in spatial and temporal resolution.

Purpose of the Study:

• To develop an advanced microscopy system for real-time imaging of extracellular ATP release.
• To overcome the limitations of low-light detection in current bioluminescence-based ATP imaging techniques.
• To enable detailed analysis of ATP release dynamics at cellular and tissue levels.

Main Methods:

• Development of an improved microscopy system utilizing luciferin-luciferase bioluminescence for ATP detection.
• Integration of simultaneous differential interference contrast (DIC) imaging with infrared optics.
• Achieving high frame rates (approximately 10 frames/s) for capturing rapid ATP release events.
• High sensitivity (approximately 10 nM) and wide dynamic range (up to 100 μM) for ATP quantification.

Main Results:

• The developed system successfully images ATP release in real time with enhanced spatial and temporal resolution.
• The method allows for the identification of specific ATP-releasing cells and sites.
• Quantitative analysis of absolute ATP concentration, spreading patterns, and release kinetics from single cells is achievable.
• Demonstrated utility through examples at both cellular and tissue levels.

Conclusions:

• The novel microscopy system significantly advances the capability to study extracellular ATP dynamics.
• This technology provides unprecedented insights into the initiation and kinetics of purinergic signaling.
• The method holds great potential for future research in cell-to-cell communication and related physiological processes.