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In vitro interactions of water-soluble garlic components with human cytochromes p450.

Eight water-soluble components of aged garlic extract were evaluated to assess their potential to inhibit the activity of human cytochrome-P450 (CYP) enzymes. The in vitro model consisted of human liver microsomes with index reactions chosen to profile the activity of the following six CYP isoforms: CYP1A2, 2B6, 2C9, 2C19, 2D6, and 3A. With only 2 exceptions, none of the 8 garlic components produced >50% inhibition even at high concentrations (100 micromol/L). S-methyl-L-cysteine and S-allyl-L-cysteine at 100 micromol/L produced modest inhibition of CYP3A, reducing activity to 20-40% of control. However available clinical evidence does not indicate CYP3A inhibition in vivo. The findings suggest that drug interactions involving inhibition of CYP3A enzymes by aged garlic extract are very unlikely.