A micro-perfusion chamber for single-cell fluorescence measurements.

Area of Science:

• Biomedical Engineering
• Cell Biology
• Microscopy

Background:

• Accurate single-cell analysis requires specialized equipment for controlled environments.
• Existing perfusion chambers may limit microscopic magnification or experimental flexibility.

Purpose of the Study:

• To develop and characterize a versatile closed micro-perfusion chamber for high-magnification single-cell fluorescence measurements.
• To demonstrate the chamber's utility for studying cellular functions in real-time.

Main Methods:

• Design and construction of a closed micro-perfusion chamber with adaptable coverslip mounting.
• Integration of ports for perfusion, reagent injection, temperature monitoring, and heating.
• Characterization of perfusion and temperature stability within the chamber.
• Application in single-cell fluorescence measurements of NAD(P)H and intracellular calcium in macrophages.

Main Results:

• The chamber facilitates attachment of cells on coverslips for both inverted and upright microscopy.
• Ports allow for controlled micro-environmental manipulation, including perfusion and rapid reagent delivery.
• The chamber is constructed from non-toxic, sterilizable materials.
• Successful real-time fluorescence measurements of NAD(P)H and intracellular calcium in human monocyte-derived macrophages were achieved.

Conclusions:

• The developed micro-perfusion chamber is a versatile tool for advanced single-cell fluorescence imaging.
• It enables precise control over the cellular micro-environment for dynamic physiological studies.
• The chamber is suitable for various cell types and microscopy setups, particularly for studying metabolic and ionic signaling.