Sarcosine-Based Glycine Transporter Type-1 (GlyT-1) Inhibitors Containing Pyridazine Moiety: A Further Search for Drugs with Potential to Influence Schizophrenia Negative Symptoms.

Abstract:

:We have synthesized a novel series of N-substituted sarcosines, analogues of NFPS (N-[3-(biphenyl-4- yloxy)-3-(4-fluorophenyl)propyl]-N-methylglycine), as type-1 glycine transporter (GlyT-1) inhibitors. Several compounds incorporated a diazine ring inhibited recombinant hGlyT-1b expressed permanently in CHO cells and GlyT-1 in rat brain synaptosomal preparations. A structure-activity relationship for the newly synthesized compounds was obtained and discussed on the ground of their GlyT-1 inhibitory potencies. Replacement of the biphenyl-4-yloxy moiety in NFPS with a 5-pyridazinylphenoxy moiety (compounds 3, 4, 5, and 6) or a 2-phenyl-5- pyridazinyloxy moiety (compounds 10, 11, and 12) afforded compounds exhibiting potent inhibition on GlyT-1 activity. The GlyT-1 inhibitory properties of NFPS analogues, in which sarcosine was closed into a ring forming (methylamino)pyridazine-3-(2H)-one, were markedly reduced (compounds 13 and 14). The pyridazine-containing GlyT-1 inhibitors with in vitro GlyT-1 inhibitory potency also enhanced extracellular glycine concentrations in conscious rat striatum as was measured by microdialysis technique. In contrast to NFPS, sarcosine-based pyridazine containing GlyT-1 inhibitors failed to evoke compulsive running behavior whereas they inhibited phencyclidine- induced hypermotility in mice. It is believed that increase of extracellular concentrations of glycine by inhibition of its reuptake may probably influence positively glutamate N-methyl-D-aspartate (NMDA)-type ionotropic receptors in the central nervous system. This may have importance in the treatment of neuropsychiatric disorders associated with hypofunctional NMDA receptor-mediated glutamatergic neurochemical transmission. Thus, impaired NMDA receptor functions have been shown to be involved in the development of the negative symptoms and the cognitive deficit of schizophrenia and the treatment of these symptoms is the possible clinical indication of GlyT-1 inhibitors including those containing pyridazine moiety.

journal_name

Curr Pharm Des

authors

Harsing LG Jr,Timar J,Szabo G,Udvari S,Nagy KM,Marko B,Zsilla G,Czompa A,Tapolcsanyi P,Kocsis A,Matyus P

doi

10.2174/1381612821666150109125623

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

2291-303

issue

17

eissn

1381-6128

issn

1873-4286

pii

CPD-EPUB-64434

journal_volume

21

pub_type

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