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K Mackie, WA Devane and B Hille
Department of Physiology, University of Washington School of Medicine, Seattle 98195.
Anandamide (arachidonyl ethanolamide) has been identified as an endogenous ligand of cannabinoid receptors on the basis of its ability to displace 3H-labeled synthetic cannabinoid in a binding assay. One well characterized cellular action of cannabinoids is inhibition of hormonally stimulated adenylyl cyclase. Another action of synthetic cannabinoids is potent, stereospecific, and reversible inhibition of N- type calcium currents (ICa) in the NG108-15 neuroblastoma-glioma cell line via a pertussis toxin (PTX)-sensitive pathway, independently of cAMP metabolism. Here we used the N18 neuroblastoma cell line and the whole-cell voltage-clamp technique to show that anandamide also potently inhibits N-type ICa in a PTX-sensitive fashion. As with the cannabinomimetic aminoalkylindole WIN 55,212-2, inhibition by anandamide was voltage dependent and N-ethylmaleimide sensitive. However, anandamide was less efficacious than either WIN 55,212-2 or the nonclassical cannabinoid CP 55,940. Indeed, anandamide appears to act as a partial agonist at the cannabinoid receptor. Application of WIN 55,212-2 always caused further inhibition of ICa in cells exposed to a maximally effective concentration of anandamide, and application of anandamide always caused a partial recovery of ICa in cells exposed to a maximally effective concentration of WIN 55,212-2. This partial agonist property of anandamide suggests that, although anandamide inhibits N-type ICa via a PTX-sensitive G protein, its action as a neuromodulator in the intact animal may be more complex than would be inferred by extrapolating the results of in vivo studies with (-)-delta 9-tetra-hydrocannabinol or synthetic cannabinoids.
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