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The uncoupling efficiency and affinity of flavonoids for vesicles.
C van Dijk1, A J Driessen, K Recourt
1ATO, P.O. Box 17, 6700 AA, Wageningen, The Netherlands. C.VANDIJK@ATO.WAG-UR.NL
Biochemical Pharmacology
|November 15, 2000
Summary
Flavonoids interact with artificial membranes, with flavones being more hydrophobic than flavanones. While some flavonoids can affect membrane potential, their in vivo uncoupling activity is minimal, though some may associate with membranes as antioxidants.
Area of Science:
- Biochemistry
- Membrane Biophysics
- Pharmacology
Background:
- Flavonoids are natural compounds with diverse biological activities.
- Their interaction with biological membranes is crucial for their function.
- Understanding flavonoid-membrane interactions informs their potential therapeutic applications.
Purpose of the Study:
- To investigate the relative hydrophobicity and membrane interaction of different flavonoid subclasses.
- To determine the effect of flavonoids on artificial membrane potential and affinity.
- To assess the potential in vivo implications of these interactions.
Main Methods:
- Utilized artificial vesicles (cytochrome c oxidase and liposomes) to model cell membranes.
- Measured membrane potential changes and transmembrane pH differences.
- Employed fluorescence quenching of diphenylhexatriene to study membrane probe interactions.
Main Results:
- Flavones were more hydrophobic than flavanones at similar hydroxylation.
- Flavonoids affected transmembrane potential and pH, with flavones showing higher uncoupling efficiency.
- Flavonols demonstrated higher affinity for liposomes than flavanones due to their planar structure.
Conclusions:
- In vivo, significant uncoupling activity of flavonoids is unlikely.
- Flavonols, like quercetin, may associate with biological membranes at physiological concentrations, potentially acting as antioxidants.