WS-50030 [7-{4-[3-(1H-inden-3-yl)propyl]piperazin-1-yl}-1,3-benzoxazol- 2(3H)-one]: A novel dopamine D2 receptor partial agonist/serotonin reuptake inhibitor with preclinical antipsychotic-like and antidepressant-like activity

Julie Adams Brennan, Radka Graf, Steven M. Grauer, Rachel L. Navarra, Claudine M. Pulicicchio, Zoë A. Hughes, Qian Lin, Caitlin Wantuch, Sharon Rosenzweig-Lipson, Farhana Pruthi, Margaret Lai, Deborah Smith, Wouter Goutier, Martina Van De Neut, Albert J. Robichaud, David Rotella, Rolf W. Feenstra, Chris Kruse, Pierre Broqua, Chad E. BeyerAndrew C. McCreary, Mark H. Pausch, Karen L. Marquis

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The preclinical characterization of WS-50030 [7-{4-[3-(1Hinden-3-yl)propyl] piperazin-1-yl}-1,3-benzoxazol-2(3H)-one] is described. In vitro binding and functional studies revealed highest affinity to the D2 receptor (D2L Ki, 4.0 nM) and serotonin transporter (Ki, 7.1 nM), potent D2 partial agonist activity (EC50, 0.38 nM; Emax, 30%), and complete block of the serotonin transporter (IC50, 56.4 nM). Consistent with this in vitro profile, WS-50030 (10 mg/kg/day, 21 days) significantly increased extracellular 5-HT in the rat medial prefrontal cortex, short-term WS-50030 treatment blocked apomorphine-induced climbing (ID50, 0.51 mg/kg) in a dose range that produced minimal catalepsy in mice and induced low levels of contralateral rotation in rats with unilateral substantia nigra 6-hydroxydopamine lesions (10 mg/kg i.p.), a behavioral profile similar to that of the D2 partial agonist aripiprazole. In a rat model predictive of antipsychotic-like activity, WS-50030 and aripiprazole reduced conditioned avoidance responding by 42 and 55% at 10 mg/kg, respectively. Despite aripiprazole's reported lack of effect on serotonin transporters, long-term treatment with aripiprazole or WS-50030 reversed olfactory bulbectomy-induced hyperactivity at doses that did not reduce activity in sham-operated rats, indicating antidepressant-like activity for both compounds. Despite possessing serotonin reuptake inhibitory activity in addition to D2 receptor partial agonism, WS-50030 displays activity in preclinical models predictive of antipsychotic- and antidepressant efficacy similar to aripiprazole, suggesting potential efficacy of WS-50030 versus positive and negative symptoms of schizophrenia, comorbid mood symptoms, bipolar disorder, major depressive disorder, and treatment-resistant depression. Furthermore, WS-50030 provides a tool to further explore how combining these mechanisms might differentiate from other antipsychotics or antidepressants.

Original languageEnglish
Pages (from-to)190-201
Number of pages12
JournalJournal of Pharmacology and Experimental Therapeutics
Issue number1
StatePublished - 1 Jan 2010


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