High-throughput functional assays of IP3-evoked Ca2+ release

Area of Science:

• Cell biology
• Molecular pharmacology
• Biochemistry

Background:

• Inositol 1,4,5-trisphosphate receptors (IP3Rs) are crucial for intracellular calcium signaling.
• Understanding IP3R function is vital for various physiological and pathological processes.
• Existing methods for IP3R analysis can be time-consuming and labor-intensive.

Purpose of the Study:

• To develop a high-throughput protocol for functional analysis of IP3Rs.
• To enable rapid and efficient measurement of IP3R-mediated calcium release.
• To provide a versatile method applicable to both native and recombinant IP3Rs.

Main Methods:

• Utilizes permeabilized cells to access intracellular components.
• Employs a low-affinity Ca(2+)-indicator (Mag-Fluo-4) within the endoplasmic reticulum (ER).
• Leverages a fluorescence plate-reader with automated additions for rapid Ca(2+) measurements.

Main Results:

• The protocol allows for high-throughput functional analysis of IP3Rs.
• Measurements of IP3R-evoked Ca(2+) release are rapid and automated.
• The method is effective for native IP3Rs in diverse cell types and recombinant IP3Rs.

Conclusions:

• This protocol offers an efficient and scalable approach for studying IP3R function.
• The developed method facilitates faster research into calcium signaling pathways.
• The technique is adaptable for various research settings investigating IP3R-related mechanisms.