Potent, selective peptide agonist for the neuropeptide Y Y5 receptor (IC50 values for inhibition of NPY binding to human Y5, Y1, Y2 and Y4 receptors are 0.24, 530, > 500, and 51 nM respectively, Ki at Y5 = 0.1 - 0.15 nM). Stimulates food intake in vivo.
CPPG is a potent antagonist of group II/III mGlu receptors. CPPG exhibits some selectivity (approximately 20 fold) for group III (IC50: 2.2 nM) over group II (IC50: 46.2 nM) mGlu receptors in the rat cerebral cortex.