Functional GPCR microarrays

Area of Science:

• Biochemistry
• Pharmacology
• Materials Science

Background:

• G-protein-coupled receptors (GPCRs) are crucial drug targets.
• Developing efficient screening methods for GPCRs is essential for drug discovery.
• Existing assays may not always integrate primary screening with selectivity and safety assessments.

Purpose of the Study:

• To describe the development of G-protein-coupled receptor (GPCR) microarrays on porous glass substrates.
• To demonstrate functional assays for receptor activity using these microarrays.
• To evaluate the potential of these microarrays in streamlining drug discovery processes.

Main Methods:

• Fabrication of porous glass slides coated with gamma-aminopropyl silane (GAPS).
• Creation of GPCR microarrays (neurotensin receptor 1, cholinergic receptor muscarinic 2, opioid receptor mu, cannabinoid receptor 1) via pin printing.
• Functional assays utilizing a europium-labeled GTP analogue and a time-gated intensified CCD detector for fluorescence capture.

Main Results:

• Successful fabrication and characterization of GPCR microarrays.
• Demonstration of selective agonism for each immobilized receptor.
• Effective screening of potential antagonists using an agonist cocktail.
• Quantification of receptor activation sufficient for EC50 and IC50 determinations.

Conclusions:

• GPCR microarrays on porous glass are a viable platform for functional assays.
• This technology can integrate primary screening with selectivity and safety evaluations.
• The developed microarrays offer a streamlined approach to drug discovery without compromising functional information.