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Structural and in Vitro Functional Characterization of a Menthyl TRPM8 Antagonist Indicates Species-Dependent Regulation

  • V. Blair Journigan
  • , David Alarcón-Alarcón
  • , Zhiwei Feng
  • , Yuanqiang Wang
  • , Tianjian Liang
  • , Denise C. Dawley
  • , Arm R. Amin
  • , Camila Montano
  • , Wade D. Van Horn
  • , Xiang-Qun Xie
  • , Antonio Ferrer-Montiel
  • , Asia Fernández-Carvajal

Research output: Contribution to journalArticlepeer-review

Abstract

TRPM8 antagonists derived from its cognate ligand, (−)-menthol, are underrepresented. We determine the absolute stereochemistry of a well-known TRPM8 antagonist, (−)-menthyl 1, using VCD and 2D NMR. We explore 1 for its antagonist effects of the human TRPM8 (hTRPM8) orthologue to uncover species-dependent inhibition versus rat channels. (−)-Menthyl 1 inhibits menthol- and icilin-evoked Ca2+ responses at hTRPM8 with IC50 values of 805 ± 200 nM and 1.8 ± 0.6 μM, respectively, while more potently inhibiting agonist responses at the rat orthologue (rTRPM8 IC50 (menthol) = 117 ± 18 nM, IC50 (icilin) = 521 ± 20 nM). Whole-cell patch-clamp recordings of hTRPM8 confirm the 1 inhibition of menthol-stimulated currents, with an IC50 of 700 ± 200 nM. We demonstrate that 1 possesses ≥400-fold selectivity for hTRPM8 versus hTRPA1/hTRPV1. (−)-menthyl 1 can be used as a novel chemical tool to study hTRPM8 pharmacology and differences in species commonly used in drug discovery.

Original languageAmerican English
JournalPharmaceutical Science and Research
StatePublished - May 1 2021

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