J Med Chem. 2008 May 22;51(10):3005-19. Epub 2008 Apr 12.

Bioisosteric heterocyclic versions of 7-{[2-(4-phenyl-piperazin-1-yl)ethyl]propylamino}-5,6,7,8-tetrahydronaphthalen-2-ol: identification of highly potent and selective agonists for dopamine D3 receptor with potent in vivo activity.

Biswas S, Hazeldine S, Ghosh B, Parrington I, Kuzhikandathil E, Reith ME, Dutta AK.

Source

Department of Pharmaceutical Sciences, Wayne State University, Detroit, MI 48202, USA.

Abstract

In the current report, we extend the SAR study on our hybrid structure 7-{[2-(4-phenyl-piperazin-1-yl)ethyl]propylamino}-5,6,7,8-tetrahydronaphthalen-2-ol further to include heterocyclic bioisosteric analogues. Binding assays were carried out with HEK-293 cells expressing either D2 or D3 receptors with tritiated spiperone to evaluate inhibition constants (Ki). Functional activity of selected compounds in stimulating GTPgammaS binding was assessed with CHO cells expressing human D2 receptors and AtT-20 cells expressing human D3 receptors. The highest binding affinity and selectivity for D3 receptors were exhibited by (-)-34 (Ki=0.92 nM and D2/D3=253). In the functional GTPgammaS binding assay, (-)-34 exhibited full agonist activity with picomolar affinity for D3 receptor with high selectivity (EC50=0.08 nM and D2/D3=248). In the in vivo rotational study, (-)-34 exhibited potent rotational activity in 6-OH-DA unilaterally lesioned rats with long duration of action, which indicates its potential application in neuroprotective treatment of Parkinson's disease.

PMID:: 18410082; [PubMed - indexed for MEDLINE]

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