Abstract
The purpose of this study was to investigate the effect of oral myricetin on the bioavailability and pharmacokinetics of orally and intravenously administered doxorubicin (DOX) in rats for oral delivery. The effect of myricetin on the P-glycoprotein (P-gp) and CYP3A4 activity was also evaluated. Myricetin inhibited CYP3A4 enzyme activity with 50% inhibition concentration of 7.8 μM. In addition, myricetin significantly enhanced the cellular accumulation of rhodamine 123 in MCF-7/ADR cells overexpressing P-gp. The pharmacokinetic parameters of DOX were determined in rats after oral (40 mg/kg) or intravenous (10 mg/kg) administration of DOX to rats in the presence and absence of myricetin (0.4, 2 or 10 mg/kg). Compared to the control group, myricetin significantly (p < 0.05, 2 mg/kg; p < 0.01, 10 mg/kg) increased the area under the plasma concentration-time curve (AUC, 51–117% greater) of oral DOX. Myricetin also significantly (p < 0.05, 2 mg/kg; p < 0.01, 10 mg/kg) increased the peak plasma concentration of DOX. Consequently, the absolute bioavailability of DOX was increased by myricetin compared to that in the control group, and the relative bioavailability of oral DOX was increased by 1.51- to 2.17-fold. The intravenous pharmacokinetics of DOX were not affected by the concurrent use of myricetin in contrast to the oral administration of DOX. Accordingly, the enhanced oral bioavailability in the presence of myricetin, while there was no significant change in the intravenous pharmacokinetics of DOX, could be mainly due to the increased intestinal absorption via P-gp inhibition by myricetin rather than to the reduced elimination of DOX. These results suggest that the increase in the oral bioavailability of DOX might be mainly attributed to enhanced absorption in the gastrointestinal tract via the inhibition of P-gp and to reduced first-pass metabolism of DOX due to inhibition of CYP3A in the small intestine and/or in the liver by myricetin.
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Choi, SJ., Shin, SC. & Choi, JS. Effects of myricetin on the bioavailability of doxorubicin for oral drug delivery in Rats: Possible role of CYP3A4 and P-glycoprotein inhibition by myricetin. Arch. Pharm. Res. 34, 309–315 (2011). https://doi.org/10.1007/s12272-011-0217-x
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DOI: https://doi.org/10.1007/s12272-011-0217-x