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Some synthetic agonists of the VR1 vanilloid (capsaicin) receptor also inhibit the facilitated transport into cells of the endogenous cannabinoid anandamide (arachidonoylethanolamide, AEA). Here we tested several AEA derivatives containing various derivatized phenyl groups or different alkyl chains as either inhibitors of the AEA membrane transporter (AMT) in intact cells or functional agonists of the VR1 vanilloid receptor in HEK cells transfected with the human VR1. We found that four known AMT inhibitors, AM404, arvanil, olvanil and linvanil, activate VR1 receptors at concentrations 400-10000-fold lower than those necessary to inhibit the AMT. However, we also found three novel AEA derivatives, named VDM11, VDM12 and VDM13, which inhibit the AMT as potently as AM404 but exhibit little or no agonist activity at hVR1. These compounds are weak inhibitors of AEA enzymatic hydrolysis and poor CB(1)/CB(2) receptor ligands. We show for the first time that, despite the overlap between the chemical moieties of AMT inhibitors and VR1 agonists, selective inhibitors of AEA uptake that do not activate VR1 (e.g. VDM11) can be developed.

Type

Journal article

Journal

FEBS Lett

Publication Date

13/10/2000

Volume

483

Pages

52 - 56

Keywords

Animals, Arachidonic Acids, Binding, Competitive, Biological Transport, Calcium, Capsaicin, Cell Line, Dose-Response Relationship, Drug, Endocannabinoids, Humans, Ligands, Polyunsaturated Alkamides, Rats, Receptors, Cannabinoid, Receptors, Drug, TRPV Cation Channels, Tumor Cells, Cultured