GPR3 activates adenylate cyclase in the absence of ligand.[7] GPR3 is expressed in mammalian oocytes where it maintains meiotic arrest and is thought to be a communication link between oocytes and the surrounding somatic tissue.[8] It has been proposed that sphingosine 1-phosphate (S1P) and sphingosylphosphorylcholine (SPC) are GPR3 ligands,[9][10] however this result was not confirmed in a β-arrestin recruitment assay.[11]
^Uhlenbrock K, Gassenhuber H, Kostenis E (November 2002). "Sphingosine 1-phosphate is a ligand of the human gpr3, gpr6 and gpr12 family of constitutively active G protein-coupled receptors". Cell. Signal. 14 (11): 941–53. doi:10.1016/S0898-6568(02)00041-4. PMID12220620.
^Hinckley M, Vaccari S, Horner K, Chen R, Conti M (November 2005). "The G-protein-coupled receptors GPR3 and GPR12 are involved in cAMP signaling and maintenance of meiotic arrest in rodent oocytes". Dev. Biol. 287 (2): 249–61. doi:10.1016/j.ydbio.2005.08.019. PMID16229830.
Iismaa TP, Kiefer J, Liu ML, et al. (1995). "Isolation and chromosomal localization of a novel human G-protein-coupled receptor (GPR3) expressed predominantly in the central nervous system". Genomics. 24 (2): 391–4. doi:10.1006/geno.1994.1635. PMID7698767.
Heiber M, Docherty JM, Shah G, et al. (1995). "Isolation of three novel human genes encoding G protein-coupled receptors". DNA Cell Biol. 14 (1): 25–35. doi:10.1089/dna.1995.14.25. PMID7832990.