Efficacy of (S)-lacosamide in preclinical models of cephalic pain

Aubin Moutal, Nathan Eyde, Edwin Telemi, Ki Duk Park, Jennifer Y. Xie, David W. Dodick, Frank Porreca, Rajesh Khanna

Research output: Contribution to journalArticlepeer-review


Migraine is one of the world'smost common neurological disorders. Current acutemigraine treatments have suboptimal efficacy, and new therapeutic options are needed. Approaches targeting calcitonin gene related peptide (CGRP) signaling are clinically effective, but small molecule antagonists have not been advanced because of toxicity. In this study, we explored the axonal growth/specification collapsin responsemediator protein 2 (CRMP2) as a novel "druggable"target for inhibiting CGRP release and for potential relevance for treatment of migraine pain. Collapsin response mediator protein 2 has been demonstrated to regulate N-type voltage-gated Ca2+ channel activity and Ca2+-dependent CGRP release in sensory neurons. The coexpression of CRMP2 with N-type voltage-gated Ca2+ channel and CGRP in trigeminal ganglia (TGs) sensory neurons suggested the possibility of a novel approach to regulate CGRP release in the trigeminal system. Screening protocols surprisingly revealed that (S)-lacosamide ((S)-LCM), an inactive analog of the clinically approved small molecule antiepileptic drug (R)-lacosamide (Vimpat), inhibited CRMP2 phosphorylation by cyclin-dependent kinase 5 in ratTGslices and decreased depolarization-evoked Ca2+ influx in TGcells in culture. (S)-LCMsignificantly blocked capsaicinevoked CGRP release from dural nerve terminals in the rat in ex vivo cranial cup preparation. Additionally, cephalic and extracephalic cutaneous allodynia induced in rats by activation of dural nociceptors with a cocktail of inflammatory mediators, was inhibited by oral administration of (S)-LCM. The confirmation of CRMP2 as an upstream mediator of CGRP release, together with the brain penetrance of this molecule suggests (S)-LCM as a potential therapy for acute migraine.

Original languageEnglish (US)
Article numbere565
JournalPain Reports
Issue number1
StatePublished - Jan 8 2016


  • (S)-Lacosamide
  • CGRP
  • CRMP2
  • CaV2.2
  • Calcium imaging
  • Cdk5
  • Cutaneous allodynia
  • Headache-related pain
  • Migraine
  • Phosphorylation
  • Trigeminal ganglia

ASJC Scopus subject areas

  • Anesthesiology and Pain Medicine


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