Characterization of major phytocannabinoids, cannabidiol and cannabinol, as isoform-selective and potent inhibitors of human CYP1 enzymes

Biochemical Pharmacology
Satoshi YamaoriKazuhito Watanabe

Abstract

Inhibitory effects of Delta(9)-tetrahydrocannabinol (Delta(9)-THC), cannabidiol (CBD), and cannabinol (CBN), the three major constituents in marijuana, on catalytic activities of human cytochrome P450 (CYP) 1 enzymes were investigated. These cannabinoids inhibited 7-ethoxyresorufin O-deethylase activity of recombinant CYP1A1, CYP1A2, and CYP1B1 in a competitive manner. CBD most potently inhibited the CYP1A1 activity; the apparent K(i) value (0.155microM) was at least one-seventeenth of the values for other CYP1 isoforms. On the other hand, CBN more effectively decreased the activity of CYP1A2 and CYP1B1 (K(i)=0.0790 and 0.148microM, respectively) compared with CYP1A1 (K(i)=0.541microM). Delta(9)-THC less potently inhibited the CYP1 activity than CBD and CBN, and showed low selectivity against the CYP1 inhibition (K(i)=2.47-7.54microM). The preincubation of CBD resulted in a time- and concentration-dependent decrease in catalytic activity of all the recombinant CYP1 enzymes and human liver microsomes. Similarly, the preincubation of Delta(9)-THC or CBN caused a time- and concentration-dependent inhibition of recombinant CYP1A1. The inactivation of CYP1A1 by CBD indicated the highest k(inact)/K(I) value (540l/mmol/min) among the ...Continue Reading

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Citations

Jan 16, 2013·Drug Metabolism and Pharmacokinetics·Rongrong JiangKazuhito Watanabe
Nov 30, 2013·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Jiawang LiuMaryam Foroozesh
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