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Current Drug Targets


ISSN (Print): 1389-4501
ISSN (Online): 1873-5592

Assessing Receptor Affinity for Inverse Agonists: Schild and Cheng-Prusoff Methods Revisited

Author(s): Jesus Giraldo, Juan Serra, David Roche and Xavier Rovira

Volume 8, Issue 1, 2007

Page: [197 - 202] Pages: 6

DOI: 10.2174/138945007779315687

Price: $65


Classical methods for the estimation of antagonist affinity constants were developed under the assumption of one unique state for the receptor. The finding of receptor constitutive activity, which implies that at least two (one active and the other inactive) receptor states coexist at equilibrium, extended the concept of antagonism by distinguishing between neutral antagonists and inverse agonists. To account for the complexity introduced in the concept of antagonism, classical Schild and Cheng-Prusoff methods have been revisited within the two-state model of agonism. The resulting equations match the classical expressions for neutral antagonists but not for inverse agonists. It is suggested a revision of current routine procedures for antagonist affinity estimation.

Keywords: Schild regression, classical Cheng-Prusoff equation, neutral antagonist, Gaddum equation

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