The Activity of Anandamide at Vanilloid VR1 Receptors Requires Facilitated Transport across the Cell Membrane and Is Limited by Intracellular Metabolism

Luciano De Petrocellis, Tiziana Bisogno, Mauro Maccarrone, John B. Davis, Alessandro Finazzi-Agrò, Vincenzo Di Marzo

Research output: Contribution to journalArticlepeer-review

Abstract

The endogenous ligand of CB1 cannabinoid receptors, anandamide, is also a full agonist at vanilloid VR1 receptors for capsaicin and resiniferatoxin, thereby causing an increase in cytosolic Ca2+ concentration in human VR1-overexpressing (hVR1-HEK) cells. Two selective inhibitors of anandamide facilitated transport into cells, VDM11 and VDM13, and two inhibitors of anandamide enzymatic hydrolysis, phenylmethylsulfonyl fluoride and methylarachidonoyl fluorophosphonate, inhibited and enhanced, respectively, the VR1-mediated effect of anandamide, but not of resiniferatoxin or capsaicin. The nitric oxide donor, sodium nitroprusside, known to stimulate anandamide transport, enhanced anandamide effect on the cytosolic Ca 2+ concentration. Accordingly, hVR1-HEK cells contain an anandamide membrane transporter inhibited by VDM11 and VDM13 and activated by sodium nitroprusside, and an anandamide hydrolase activity sensitive to phenylmethylsulfonyl fluoride and methylarachidonoyl fluorophosphonate, and a fatty acid amide hydrolase transcript. These findings suggest the following. (i) Anandamide activates VR1 receptors by acting at an intracellular site. (ii) Degradation by fatty acid amide hydrolase limits anandamide activity on VR1; and (iii) the anandamide membrane transporter inhibitors can be used to distinguish between CB1 or VR1 receptor-mediated actions of anandamide. By contrast, the CB1 receptor antagonist SR141716A inhibited also the VR1-mediated effect of anandamide and capsaicin on cytosolic Ca2+ concentration, although at concentrations higher than those required for CB1 antagonism.

Original languageEnglish
Pages (from-to)12856-12863
Number of pages8
JournalJournal of Biological Chemistry
Volume276
Issue number16
DOIs
Publication statusPublished - Apr 20 2001

ASJC Scopus subject areas

  • Biochemistry

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