RXFP Receptor (松弛素家族肽受体)

RXFP Receptor is a type of G protein-coupled receptor (GPCRs) and belongs to the relaxin family. The family includes RXFP1 (LGR7), RXFP2 (LGR8), RXFP3 (GPCR135) and RXFP4 (GPCR142). Its upstream ligands include relaxin, insulin-like peptide 3 (INSL3), relaxin-3 (Relaxin-3) and insulin-like peptide 5 (INSL5). Multiple signaling pathways are involved downstream, such as cAMP, PI3K, MAPK and other signaling pathways. RXFP1 plays a role in reproductive organ development, tissue fibrosis regulation, vasodilation, etc.; RXFP2 is involved in testicular descent, germ cell survival and bone metabolism; RXFP3 may be related to anxiety, appetite regulation and neuroendocrine function; the function of RXFP4 has not yet been fully clarified, but it is associated with the role of INSL5. RXFP1 is closely related to cardiac and renal fibrosis, asthma, scleroderma, and abnormal embryo implantation; RXFP2 is associated with cryptorchidism and infertility; RXFP3 has potential application value in the treatment of anxiety and obesity^{[1][2][3][4][5][6]}.