Evaluation of 1,2,5-thiadiazoles as modulators of M₁/M₅ muscarinic receptor subtypes.

Abstract:

:Studies have demonstrated the presence of allosteric binding sites on each of the muscarinic acetylcholine receptor (mAChR) subtypes. Since most drugs targeting muscarinic receptors bind to the highly conserved orthosteric binding site, they fail to achieve appreciable subtype selectivity. Targeting non-conserved allosteric sites may provide a new way of enhancing selectivity for individual subtypes of muscarinic receptor. Tetra(ethyleneglycol)(3-methoxy-1,2,5-thiadiazol-4-yl)[3-(1-methyl-1,2,5,6-tetrahydropyrid-3-yl)-1,2,5-thiadiazol-4-yl] ether, CDD-0304 (10), was found to be a M₁/₂/₄ selective muscarinic agonist and might prove useful in treating the symptoms associated with schizophrenia (J. Med. Chem.2003, 46, 4273). It was hypothesized that the observed subtype selectivity demonstrated by 10 may be due to its ability to function as a bitopic ligand (J. Med. Chem.2006, 49, 7518). To further investigate this possibility, a novel series of compounds was synthesized using a 1,2,5-thiadiazole moiety along with varying lengths of a polyethylene glycol linker and terminal groups, for evaluation as potential allosteric modulators of muscarinic receptors. Preliminary biological studies were performed using carbachol to stimulate M₁ and M₅ receptors. No significant agonist activity was observed at either M₁ or M₅ receptors for any of the compounds. Compound 18, 2-(4-methoxy-1,2,5-thiadiazol-3-yloxy)-N,N-dimethylethanamine fumarate (CDD-0361F) was found to block the effects of carbachol at M5 muscarinic receptors.

journal_name

Bioorg Med Chem

authors

Maheshwari A,Rao PS,Messer WS Jr

doi

10.1016/j.bmc.2014.01.049

subject

Has Abstract

pub_date

2014-03-15 00:00:00

pages

1838-44

issue

6

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(14)00086-8

journal_volume

22

pub_type

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