PCCG-4 is a research drug which acts as a selective antagonist for the group II metabotropic glutamate receptors (mGluR2/3), with slight selectivity for mGluR2 although not sufficient to distinguish mGluR2 and mGluR3 responses from each other. It is used in research into the function of the group II metabotropic glutamate receptors.
^Pellicciari R, Marinozzi M, Natalini B, Costantino G, Luneia R, Giorgi G, Moroni F, Thomsen C (May 1996). "Synthesis and pharmacological characterization of all sixteen stereoisomers of 2-(2'-carboxy-3'-phenylcyclopropyl)glycine. Focus on (2S,1'S,2'S,3'R)-2-(2'-carboxy-3'-phenylcyclopropyl)glycine, a novel and selective group II metabotropic glutamate receptors antagonist". Journal of Medicinal Chemistry. 39 (11): 2259–69. doi:10.1021/jm960059+. PMID8667369.
^Thomsen C, Bruno V, Nicoletti F, Marinozzi M, Pellicciari R (July 1996). "(2S,1'S,2'S,3'R)-2-(2'-carboxy-3'-phenylcyclopropyl)glycine, a potent and selective antagonist of type 2 metabotropic glutamate receptors". Molecular Pharmacology. 50 (1): 6–9. PMID8700119.
^Cozzi A, Attucci S, Peruginelli F, Marinozzi M, Luneia R, Pellicciari R, Moroni F (July 1997). "Type 2 metabotropic glutamate (mGlu) receptors tonically inhibit transmitter release in rat caudate nucleus: in vivo studies with (2S,1'S,2'S,3'R)-2-(2'-carboxy-3'-phenylcyclopropyl)glycine, a new potent and selective antagonist". The European Journal of Neuroscience. 9 (7): 1350–5. doi:10.1111/j.1460-9568.1997.tb01489.x. PMID9240392.
^Ciccarelli R, Di Iorio P, Bruno V, Battaglia G, D'Alimonte I, D'Onofrio M, Nicoletti F, Caciagli F (September 1999). "Activation of A(1) adenosine or mGlu3 metabotropic glutamate receptors enhances the release of nerve growth factor and S-100beta protein from cultured astrocytes". Glia. 27 (3): 275–81. doi:10.1002/(SICI)1098-1136(199909)27:3<275::AID-GLIA9>3.0.CO;2-0. PMID10457374.
^Vetter P, Garthwaite J, Batchelor AM (June 1999). "Regulation of synaptic transmission in the mossy fibre-granule cell pathway of rat cerebellum by metabotropic glutamate receptors". Neuropharmacology. 38 (6): 805–15. doi:10.1016/S0028-3908(99)00003-9. PMID10465684.