2009
DOI: 10.1002/chir.20794
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Interactions between quercetin and Warfarin for albumin binding: A new eye on food/drug interference

Abstract: The interaction between quercetin, a popular antioxidant flavonoid, and human serum albumin (HSA) is investigated and characterized by means of induced circular dichroism and saturation transfer difference NMR. These techiques demonstrate the reversible binding of quercetin to the carrier protein, which is responsible for its dissolution in aqueous medium. Competition experiments with two classical probes for HSA binding sites, namely Ibuprofen and Warfarin (a common anticoagulant coumarin), demonstrate that q… Show more

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Cited by 27 publications
(20 citation statements)
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“…Thus, quercetin can effectively block the binding of albumin with curcumin, resulting in an increase in the fraction of unbound curcumin in the medium and thereby increasing the uptake of curcumin by WiDr cells. Our findings are also supported by those of recent in vitro studies, which showed that quercetin and warfarin compete for albumin bind- Bari et al, 2010). The possibility that the increase in the curcumin uptake was caused by quercetin-induced transporter inhibition (Anuchapreeda et al, 2002;Zhou et al, 2004;Li and Choi, 2009) can be excluded by considering the findings of studies on the effect of probenecid and cyclosporine A-multispecific active drug transport inhibitors (Shitara et al, 2005); these chemical inhibitors did not lead to any increase in the uptake of curcumin into WiDr cells.…”
Section: Resultssupporting
confidence: 90%
“…Thus, quercetin can effectively block the binding of albumin with curcumin, resulting in an increase in the fraction of unbound curcumin in the medium and thereby increasing the uptake of curcumin by WiDr cells. Our findings are also supported by those of recent in vitro studies, which showed that quercetin and warfarin compete for albumin bind- Bari et al, 2010). The possibility that the increase in the curcumin uptake was caused by quercetin-induced transporter inhibition (Anuchapreeda et al, 2002;Zhou et al, 2004;Li and Choi, 2009) can be excluded by considering the findings of studies on the effect of probenecid and cyclosporine A-multispecific active drug transport inhibitors (Shitara et al, 2005); these chemical inhibitors did not lead to any increase in the uptake of curcumin into WiDr cells.…”
Section: Resultssupporting
confidence: 90%
“…Based on a known significant overlap between the sets of proteins able to interact with warfarin and the flavonoid quercetin 32 , we hypothesized that quercetin may also interact with TG2 to alter its activity. Direct binding of quercetin to TG2 was demonstrated by a pull-down assay using quercetin-conjugated sepharose beads incubated with purified TG2 protein (Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The definition of “significant” interaction in rxlist.com is that the combination potentially can cause dangerous DDI and should be used with cautions and close monitoring. It is reported that quercetin displaces warfarin bound to human serum albumin [26] due to competitive binding and that genistein also shares the binding sites in human serum albumin with warfarin [27]. It is reported that special precautions are necessary when taking dronabinol together with warfarin [28].…”
Section: Resultsmentioning
confidence: 99%