UDP-glucuronyltransferase activities of rabbit liver microsomes for cannabinoids

UDP-glucuronyltransferase activities for delta 8-tetrahydrocannabinol, 11-hydroxy-delta 8-tetrahydrocannabinol, cannabidiol and cannabinol were examined using liver microsomes of rabbits. The activities for cannabidiol and cannabinol were 2.5 and 19 times higher, respectively, than those for delta 8-tetrahydrocannabinol and 11-hydroxy-delta 8-tetrahydrocannabinol. Thus, the present study supports the view that glucuronide formation plays an important role in the metabolism of cannabinol, but does only a minor role in that of delta 8-tetrahydrocannabinol and 11-hydroxy-delta 8-tetrahydrocannabinol.