Prolonged treatment with ligands affects ligand binding to the human serotonin1A receptor in chinese hamster ovary cells

Pucadyil, Thomas J. ; Jafurulla, Md. ; Chattopadhyay, Amitabha (2006) Prolonged treatment with ligands affects ligand binding to the human serotonin1A receptor in chinese hamster ovary cells Cellular and Molecular Neurobiology, 26 (3). pp. 247-257. ISSN 0272-4340

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Official URL: http://www.springerlink.com/content/k354m2065226p2...

Related URL: http://dx.doi.org/10.1007/s10571-006-9002-7

Abstract

1. The serotonin1A receptors are members of a superfamily of seven transmembrane domain receptors that couple to G-proteins, and appear to be involved in several behavioral and cognitive functions. 2. We monitored the effect of prolonged treatment of the human serotonin1A receptor expressed in Chinese hamster ovary (CHO) cells with pharmacologically well-characterized ligands on its binding to the agonist 8-hydroxy-2(di-N-propylamino)tetralin (8-OH-DPAT) and antagonist 4-(2'-methoxy)-phenyl-1-[2'-(N-2"-pyridinyl)-p-fluorodobenzamido]ethyl-piperazine (p-MPPF). 3. Our results indicate that prolonged treatment with the specific agonist (8-OH-DPAT) differentially affects subsequent binding of the agonist and antagonist to the receptor in a manner independent of receptor-G-protein coupling. Importantly, our results show that prolonged treatment with the commonly used antagonist p-MPPF, and its iodinated analogue 4-(2'-methoxy)-phenyl-1-[2'-(N-2"-pyridinyl)-p-iodobenzamido]ethyl-piperazine (p-MPPI), which have earlier been reported to display similar binding properties to serotonin1A receptors, induces significantly different effects on the ligand binding function of serotonin1A receptors.

Item Type:Article
Source:Copyright of this article belongs to Springer-Verlag.
Keywords:Serotonin1A Receptor; Agonist; Antagonist; Inverse Agonist; G-protein Coupling; Desensitization
ID Code:6981
Deposited On:26 Oct 2010 04:50
Last Modified:16 May 2016 17:14

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