group III mGlu receptors 2.2 nM (IC 50 ) |
group II mGlu receptors 46.2 nM (IC 50 ) |
CPPG ((RS)-CPPG) potently reversed both L-AP4 (IC 50 =2.2 nM)- and L-CCG-I (IC 50 =46.2 nM) -mediated inhibition of forskolin-stimulated cyclic AMP accumulation in adult rat cortical slices. CPPG is a potent antagonist against group II/III mGlu receptors in the adult rat cortex and shows moderate selectivity for group III mGlu receptors. Conversely, CPPG has weak effects at group I mGlu receptors in both the neonatal rat cortex and cultured cerebellar granule cells.