Menthol Binding and Inhibition of α7-Nicotinic Acetylcholine Receptors

Abrar Ashoor, Jacob C. Nordman, Daniel Veltri, Keun Hang Susan Yang, Lina Al Kury, Yaroslav Shuba, Mohamed Mahgoub, Frank C. Howarth, Bassem Sadek, Amarda Shehu, Nadine Kabbani, Murat Oz

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

Menthol is a common compound in pharmaceutical and commercial products and a popular additive to cigarettes. The molecular targets of menthol remain poorly defined. In this study we show an effect of menthol on the α7 subunit of the nicotinic acetylcholine (nACh) receptor function. Using a two-electrode voltage-clamp technique, menthol was found to reversibly inhibit α7-nACh receptors heterologously expressed in Xenopus oocytes. Inhibition by menthol was not dependent on the membrane potential and did not involve endogenous Ca2+-dependent Cl- channels, since menthol inhibition remained unchanged by intracellular injection of the Ca2+ chelator BAPTA and perfusion with Ca2+-free bathing solution containing Ba2+. Furthermore, increasing ACh concentrations did not reverse menthol inhibition and the specific binding of [125I] α-bungarotoxin was not attenuated by menthol. Studies of α7- nACh receptors endogenously expressed in neural cells demonstrate that menthol attenuates α7 mediated Ca2+ transients in the cell body and neurite. In conclusion, our results suggest that menthol inhibits α7-nACh receptors in a noncompetitive manner.

Original languageEnglish
Article numbere67674
JournalPLoS ONE
Volume8
Issue number7
DOIs
Publication statusPublished - Jul 23 2013

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

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