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Journal of Biomolecular Screening
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State-Dependent Compound Inhibition of Nav1.2 Sodium Channels Using the FLIPR Vm Dye: On-Target and Off-Target Effects of Diverse Pharmacological Agents

Elfrida R. Benjamin

Purdue Pharma L.P., 6 Cedarbrook Drive, Cranbury, NJ 08512 Elfrida.Benjamin{at}pharma.com

Farhana Pruthi

Shakira Olanrewaju

Victor I. Ilyin

Gregg Crumley

Elena Kutlina

Linguagen Corp., Cranbury, NJ

Kenneth J. Valenzano

Amicus Therapeutics, Cranbury, NJ

Richard M. Woodward

Adolor Corporation, Exton, PA

Voltage-gated sodiumchannels (NaChs) are relevant targets for pain, epilepsy, and a variety of neurological and cardiac disorders. Traditionally, it has been difficult to develop structure-activity relationships for NaCh inhibitors due to rapid channel kinetics and state-dependent compound interactions. Membrane potential (V m)dyes in conjunctionwith a high-throughput fluorescence imaging plate reader (FLIPR) offer a satisfactory 1st-tier solution. Thus, the authors have developed a FLIPR V m assay of rat Na v1.2NaCh. Channels were opened by addition of veratridine, and Vm dye responses were measured. The IC50 values from various structural classes of compounds were compared to the resting state binding constant (K r)and inactivated state binding constant (K i)obtained using patch-clamp electrophysiology (EP). The FLIPR values correlated with Ki but not K r.FLIPRIC50 values fellwithin 0.1-to 1.5-fold of EPKi values, indicating that the assay generally reports use-dependent inhibition rather than resting state block. The Library of Pharmacologically Active Compounds (LOPAC, Sigma) was screened. Confirmed hits arose from diverse classes such as dopamine receptor antagonists, serotonin transport inhibitors, and kinase inhibitors. These data suggest that NaCh inhibition is inherent in a diverse set of biologically active molecules and may warrant counterscreening NaChs to avoid unwanted secondary pharmacology.

Key Words: sodium • channel • membrane potential • inactivation • state dependent • fluorescent imaging plate reader

This version was published on February 1, 2006

Journal of Biomolecular Screening, Vol. 11, No. 1, 29-39 (2006)
DOI: 10.1177/1087057105280918
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