Title : Breast cancer resistance protein (Bcrp1/Abcg2) limits net intestinal uptake of quercetin in rats by facilitating apical efflux of glucuronides.

Pub. Date : 2005 Jun

PMID : 15749994






5 Functional Relationships(s)
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1 Breast cancer resistance protein (Bcrp1/Abcg2) limits net intestinal uptake of quercetin in rats by facilitating apical efflux of glucuronides. Quercetin ATP binding cassette subfamily G member 2 Rattus norvegicus
2 Breast cancer resistance protein (Bcrp1/Abcg2) limits net intestinal uptake of quercetin in rats by facilitating apical efflux of glucuronides. Quercetin ATP binding cassette subfamily G member 2 Rattus norvegicus
3 When intestinal Bcrp1 was inhibited by FTC in Mrp2-deficient rats, total plasma concentrations of quercetin and its methylated metabolite isorhamnetin after 30 min of perfusion were more than twice that of controls (12.3 +/- 1.5 versus 5.6 +/- 1.3 muM; p < 0.01), whereas uptake of free quercetin from the intestinal lumen was not affected. Quercetin ATP binding cassette subfamily G member 2 Rattus norvegicus
4 When intestinal Bcrp1 was inhibited by FTC in Mrp2-deficient rats, total plasma concentrations of quercetin and its methylated metabolite isorhamnetin after 30 min of perfusion were more than twice that of controls (12.3 +/- 1.5 versus 5.6 +/- 1.3 muM; p < 0.01), whereas uptake of free quercetin from the intestinal lumen was not affected. Quercetin ATP binding cassette subfamily G member 2 Rattus norvegicus
5 In conclusion, Bcrp1 limits net intestinal absorption of quercetin by pumping quercetin glucuronides back into the lumen. Quercetin ATP binding cassette subfamily G member 2 Rattus norvegicus