G-protein coupled receptor 146 is a protein that in humans is encoded by the GPR146gene. The receptor has been shown to bind cholesin, a gut-derived hormone that is secreted from the intestine in response to dietary cholesterol absorption. In response to cholesin binding, GPR146 signaling inhibit cholesterol synthesis. Consistent with this interaction, murine genetic disruption of GPR146 lowers serum cholesterol and reduces atheroscleroticaortic lesions.
GPR146 has also been identified as a possible receptor for C-peptide.
Gloriam DE, Schiöth HB, Fredriksson R (Apr 2005). "Nine new human Rhodopsin family G-protein coupled receptors: identification, sequence characterisation and evolutionary relationship". Biochimica et Biophysica Acta (BBA) - General Subjects. 1722 (3): 235–46. doi:10.1016/j.bbagen.2004.12.001. PMID15777626.