Recent Patents on CNS Drug Discovery (Discontinued)

Vincenzo Di Marzo
Istituto di Chimica Biomolecolare (I.C.B.)
Consiglio Nazionale delle Ricerche (C.N.R.)
Via Campi Flegrei 34
Pozzuoli, Napoli 80078


Polyamine Modulation of NMDARs as a Mechanism to Reduce Effects of Alcohol Dependence

Author(s): Susan Barron, Ben Lewis, Kristen Wellmann, Megan Carter, Justin Farook, Josh Ring, Dennis Trent Rogers, Robert Holley, Peter Crooks, John Littleton.


Relapse and neurodegeneration are two of the major therapeutic targets in alcoholism. Fortuitously, the roles of glutamate/NMDA receptors (NMDARs) in withdrawal, conditioning and neurotoxicity mean that NMDAR inhibitors are potentially valuable for both targets. Preclinical studies further suggest that inhibitory modulators that specifically reduce the co-agonist effects of polyamines on NMDARs are potential non-toxic medications. Using agmatine as a lead compound, over 1000 novel compounds based loosely on this structure were synthesized using feedback from a molecular screen. A novel series of aryliminoguanidines with appropriate NMDAR activity in the molecular screen were discovered (US patent application filed 2007). The most potent and selective aryliminoguanidine, JR 220 [4- (chlorobenzylidenamino)- guanidine hydrochloride], has now been tested in a screening hierarchy for anti-relapse and neuroprotective activity, ranging from cell-based assay, through tissue culture to animal behavior. This hierarchy has been validated using drugs with known, or potential, clinical value at these targets (acamprosate (N-acetyl homotaurine), memantine and topiramate). JR220 was non-toxic and showed excellent activity in every screen with a potency 5-200x that of the FDA-approved anti-relapse agent, acamprosate. This chapter will present a review of the background and rationale for this approach and some of the findings garnered from this approach as well as patents targeting the glutamatergic system especially the NMDAR.

Keywords: NR2B neuroprotection, polyamine, relapse

Order Reprints Order Eprints Rights & PermissionsPrintExport

Article Details

Year: 2012
Page: [129 - 144]
Pages: 16
DOI: 10.2174/157488912800673128
Price: $100