Kv4.3 is a potassium channel that is involved in the repolarisation of action potentials in cardiac muscle. Kv4.3 is not a classic cannabinoid receptor but its activity is modulated by cannabinoids. Since cannabinoids have a physiological effect on Kv4.3 it is effectively a cannabinoid receptor.
http://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=554
http://en.wikipedia.org/wiki/KCND3
Anandamide 2AG
References:
Pertwee, R.G., Howlett, A.C., Abood, M.E., Alexander, S.P.H., Di Marzo, V., Elphick, M.R., Greasley, P.J., Hansen, H.S., Kunos, G., Mackie, K., et al. (2010). International Union of Basic and Clinical Pharmacology. LXXIX. cannabinoid receptors and their ligands: beyond CB₁ and CB₂. Pharmacol. Rev. 62, 588–631.
Heart, brain (cortex, cerebellum, amygdala. caudate nucleus), smooth muscle, lower levels in the liver, skeletal muscle, kidney and pancreas.
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