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High-Throughput Screening Campaign Identified a Potential Small Molecule RXFP3/4 Agonist

Guang-yao Lin,Yang Feng,Xiao-qing Cai,Cai-hong Zhou,Lijun Shao,Yan Chen,Linhai Chen,Qing Liu,Qingtong Zhou,R. Bathgate,Dehua Yang,Ming-Wei Wang

Published 2021 in Molecules

ABSTRACT

Relaxin/insulin-like family peptide receptor 3 (RXFP3) belongs to class A G protein-coupled receptor family. RXFP3 and its endogenous ligand relaxin-3 are mainly expressed in the brain with important roles in the regulation of appetite, energy metabolism, endocrine homeostasis and emotional processing. It is therefore implicated as a potential target for treatment of various central nervous system diseases. Since selective agonists of RXFP3 are restricted to relaxin-3 and its analogs, we conducted a high-throughput screening campaign against 32,021 synthetic and natural product-derived compounds using a cyclic adenosine monophosphate (cAMP) measurement-based method. Only one compound, WNN0109-C011, was identified following primary screening, secondary screening and dose-response studies. Although displayed agonistic effect in cells overexpressing the human RXFP3, it also showed cross-reactivity with the human RXFP4. This hit compound may provide not only a chemical probe to investigate the function of RXFP3/4, but also a novel scaffold for the development of RXFP3/4 agonists.

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