Development and validation of a cell-based high-throughput screening assay for TRPM2 channel modulators

Area of Science:

• Ion channel research
• Cellular physiology
• Pharmacology

Background:

• TRPM2 (transient receptor potential melastatin 2) is an ion channel activated by oxidative stress, increasing intracellular calcium.
• Understanding TRPM2's physiological roles requires specific modulators, but suitable high-throughput screening assays were lacking.

Purpose of the Study:

• To develop and validate a novel cell-based assay for high-throughput screening of TRPM2 ion channel modulators.

Main Methods:

• Utilized a novel suspension B lymphocyte cell line stably expressing TRPM2.
• Employed a Ca(2+)-sensitive fluorescence dye (Fluo-4 NW) in a 96-well plate format to measure TRPM2-dependent Ca(2+) transients induced by H(2)O(2) and N-methyl-N'-nitrosoguanidine.
• Validated assay robustness using Z' factor statistical analysis and tested known TRPM2 inhibitors.

Main Results:

• Developed a robust cell-based assay with a Z' factor consistently above 0.5.
• Successfully measured TRPM2-dependent Ca(2+) transients induced by oxidative/nitrosative stress agents.
• Demonstrated assay utility by confirming the effects of known TRPM2 modulators.

Conclusions:

• The developed cell-based assay is suitable for high-throughput screening.
• This assay can identify novel modulators of the TRPM2 ion channel from large compound libraries.
• Facilitates further research into TRPM2's function in cellular and organismal physiology.