Journal
PHARMACEUTICAL RESEARCH
Volume 30, Issue 5, Pages 1409-1422Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11095-013-0979-6
Keywords
ectopic activity; NaV1.7; pharmacokinetics and pharmacodynamics; sodium channels; spinal nerve ligation rat model
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In vivo and ex vivo inhibition of ectopic activity of clinically used and newly developed sodium channel (NaV) blockers were quantified in the rat spinal nerve ligation (SNL) model using a pharmacokinetic-pharmacodynamic (PKPD) approach and correlated to in vitro NaV1.7 channel inhibition and clinical effective concentrations. In vivo, drug exposure and inhibition of ectopic activity were assessed in anaesthetized SNL rats at two dose levels. Ex vivo, compounds were applied at increasing concentrations to dorsal root ganglias isolated from SNL rats. The inhibitory potency (IC (50) ) was estimated using PKPD analysis. In vitro IC (50) was estimated using an electrophysiology-based assay using recombinant rat and human NaV1.7 expressing HEK293 cells. In vivo and ex vivo inhibition of ectopic activity correlated well with the in vitro inhibition on the rat NaV1.7 channel. The estimated IC (50s) for inhibition of ectopic activity in the SNL model occurred at similar unbound concentrations as clinical effective concentrations in humans. Inhibition of ectopic activity in the SNL model could be useful in predicting clinical effective concentrations for novel sodium channel blockers. In addition, in vitro potency could be used for screening, characterization and selection of compounds, thereby reducing the need for in vivo testing.
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