A versatile chamber for microphysiologic studies with gas mixtures under high pressure

Area of Science:

• Neuroscience
• Physiology
• Biomedical Engineering

Background:

• Studying the effects of elevated gas pressures on biological tissues requires specialized equipment.
• Existing methods may lack the precision or versatility needed for detailed in vitro investigations.

Purpose of the Study:

• To describe a newly developed pressure chamber for microelectrode recordings.
• To demonstrate its utility in studying the effects of gas pressure on isolated mammalian CNS preparations.

Main Methods:

• Design and construction of a pressure chamber capable of withstanding up to 200 bar.
• Integration of features for complete access, visibility, perfusion, and temperature control.
• Utilizing micromanipulators for precise microelectrode placement (1-micron steps).
• Conducting physiological tests with hippocampal slice preparations.

Main Results:

• The pressure chamber allows for versatile experimental configurations and various study types.
• Single-unit recordings were achieved in vitro at normal and elevated gas pressures.
• Physiological tests with hippocampal slices confirmed the system's reliability.

Conclusions:

• The described pressure chamber is a reliable tool for in vitro research.
• It is highly useful for investigating gas pressure effects on isolated mammalian CNS networks.