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Atypical antipsychotics and inverse agonism at 5-HT2 receptors

[ Vol. 21 , Issue. 26 ]


Laura C. Sullivan, William P Clarke and Kelly A. Berg   Pages 3732 - 3738 ( 7 )


It is now well accepted that receptors can regulate cellular signaling pathways in the absence of a stimulating ligand, and inverse agonists can reduce this ligand-independent or “constitutive” receptor activity. Both the serotonin 5-HT2A and 5-HT2C receptors have demonstrated constitutive receptor activity in vitro and in vivo. Each has been identified as a target for treatment of schizophrenia. Further, most, if not all, atypical antipsychotic drugs have inverse agonist properties at both 5-HT2A and 5-HT2C receptors. This paper describes our current knowledge of inverse agonism of atypical antipsychotics at 5-HT2A/2C receptor subtypes in vitro and in vivo. Exploiting inverse agonist properties of APDs may provide new avenues for drug development.


Antipsychotic drugs, atypical antipsychotic drugs, inverse agonism, constitutive activity, serotonin, 5-HT2A receptors, 5-HT2C receptors, schizophrenia.


Department of Pharmacology – MS 7764, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, USA.

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