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Membrane-thinning effect of curcumin.

Wei-Chin Hung1, Fang-Yu Chen, Chang-Chun Lee

  • 1Department of Physics, Chinese Military Academy, Fengshan, Kaohsiung, 83055 Taiwan.

Biophysical Journal
|March 4, 2008
PubMed
Summary

Curcumin thins lipid bilayers, potentially altering membrane protein function. This study quantifies curcumin

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Area of Science:

  • Biophysics
  • Membrane Biophysics
  • Pharmacology

Background:

  • Curcumin's interaction with lipid bilayers is poorly understood.
  • Previous studies show curcumin affects gramicidin channel lifetime in 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) bilayers without altering conductance.

Purpose of the Study:

  • To elucidate the mechanism behind curcumin's effect on membrane protein function.
  • To quantify curcumin's interaction with lipid bilayers and its impact on bilayer properties.

Main Methods:

  • Isothermal titration calorimetry (ITC) to determine curcumin's partition coefficient in DOPC bilayers.
  • X-ray lamellar diffraction to measure DOPC bilayer thickness changes with varying curcumin concentrations.

Main Results:

  • Curcumin exhibits a nonlinear membrane-thinning effect on DOPC bilayers.
  • The partition coefficient of curcumin binding to DOPC bilayers was measured.
  • Curcumin not only thins the bilayer but may also reduce its elastic moduli.

Conclusions:

  • Curcumin modifies lipid bilayer properties, including thickness and elasticity.
  • These modifications provide a plausible explanation for curcumin's observed effects on membrane protein function.
  • Curcumin's impact on membrane properties suggests a novel mechanism for modulating biological processes involving membrane proteins.

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