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  • Animal/s, Biotransformation, Cannabidiol (CBD), Cannabinoid/s, Cannabinol (CBN), Cytochrome P450, Electrophoresis, Enzyme system, In Vitro Techniques, Inbred strain/s, Liver, Male, Metyrapone, Microsomes, Oxidation-Reduction, Polyacrylamide Gel, Pyridines, rat/s, Testosterone
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Mechanism for inhibitory effect of cannabidiol on microsomal testosterone oxidation in male rat liver

Effects of four cannabinoids [cannabidiol (CBD), delta 8-tetrahydrocannabinol, delta 9-tetrahydrocannabinol, and cannabinol] on hepatic microsomal oxidation of testosterone (17 beta-hydroxy-androst-4-ene-3-one) were examined in adult male rats. Only CBD (30 microM) competitively inhibited 2 alpha-hydroxy-testosterone (2 alpha-OH-T) and 16 alpha-OH-T formation by hepatic microsomes but did not affect androstenedione (androst-4-ene-3,17-dione) and 7 alpha-OH-T formation. Kinetic analyses demonstrated that the inhibitory profile of CBD for testosterone oxidation was different from those of SKF 525-A, which caused competitive inhibition for 2 alpha- and 16 alpha-hydroxylations and noncompetitive inhibition for 6 alpha-hydroxylation, and of metyrapone, which inhibited only 6 beta-hydroxylation competitively. CBD also suppressed formation of 2 alpha-OH-T,...
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Pharmacokinetics and metabolism of the plant cannabinoids, delta9-tetrahydrocannabinol, cannabidiol and cannabinol

Increasing interest in the biology, chemistry, pharmacology, and toxicology of cannabinoids and in the development of cannabinoid medications necessitates an understanding of cannabinoid pharmacokinetics and disposition into biological fluids and tissues. A drug's pharmacokinetics determines the onset, magnitude, and duration of its pharmacodynamic effects. This review of cannabinoid pharmacokinetics encompasses absorption following diverse routes of administration and from different drug formulations, distribution of analytes throughout the body, metabolism by different tissues and organs, elimination from the body in the feces, urine, sweat, oral fluid, and hair, and how these processes change over time. Cannabinoid pharmacokinetic research has been especially challenging due to low analyte...
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