[Development of a functional cell-based HTS assay for the identification mGluR4 modulators]

Area of Science:

• Neuroscience
• Pharmacology
• Cell Biology

Background:

• Metabotropic glutamate receptor 4 (mGluR4) is a key target for neurological disorders.
• Identifying specific modulators requires robust and efficient screening assays.

Purpose of the Study:

• To develop a functional, cell-based high throughput screening (HTS) assay for metabotropic glutamate receptor 4 (mGluR4) modulators.
• To establish a stable recombinant cell line for screening mGluR4 agonists and antagonists.

Main Methods:

• Human mGluR4 cDNA was transfected into HEK-293 cells expressing promiscuous G-protein (Ga alpha15).
• A functional Ca2+ influx assay using Fluo Calcium Indicator was optimized.
• Assay performance was validated using known mGluR4 agonists and antagonists, and Z'-factor was calculated.

Main Results:

• A stable human mGluR4-expressing cell line was successfully generated and validated.
• The assay demonstrated high performance with Z'-factor values of 0.80 (96-well) and 0.65 (384-well).
• Rank order potency for agonists (L-AP4 > L-SOP > L-Glu) and antagonists (MSOP > MPPG) was established.

Conclusions:

• A robust and validated functional cell-based HTS assay for mGluR4 has been developed.
• This assay is suitable for screening large compound libraries to identify novel mGluR4 modulators.
• The established cell line provides a valuable tool for drug discovery targeting mGluR4.