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Interactions between trypanocidal drugs and membrane phospholipids. A surface pressure, surface potential and
F Lakhdar-Ghazal1, A Vigroux, M Willson
1Centre de Recherches de Biochimie et de Génétique Cellulaires, CNRS, Université Paul Sabatier, Toulouse, France.
Biochemical Pharmacology
|November 6, 1991
Summary
Amphiphilic diphenyl methane derivatives interact with phospholipids, influencing their biological activity. Drug D3 shows stronger binding to phosphatidylserine (PS) than D2, correlating with observed antiproliferative and trypanocidal effects.
Area of Science:
- Biochemistry
- Pharmacology
- Materials Science
Background:
- Amphiphilic diphenyl methane derivatives possess antiproliferative and trypanocidal properties.
- Understanding drug-lipid interactions is crucial for explaining biological activity.
Purpose of the Study:
- To investigate the interaction of diphenyl methane derivatives (D1, D2, D3) with phospholipids (phosphatidylcholine and phosphatidylserine).
- To correlate these interactions with the compounds' biological effects.
Main Methods:
- Monolayer experiments measuring surface pressure and potential.
- Electrophoretic mobility measurements on liposomes.
- Analysis of drug-lipid binding constants.
Main Results:
- Compounds D2 and D3 interacted with phosphatidylcholine (PC) and phosphatidylserine (PS).
- Binding constants of approximately 10^4 M⁻¹ were determined for D2 and D3.
- D3 demonstrated stronger binding to PS than D2, particularly in bilayers.
Conclusions:
- The binding affinity of D3 to PS is greater than D2.
- These phospholipid interactions correlate with the observed antiproliferative and trypanocidal activities.
- The findings help explain discrepancies between drug concentrations for biological and binding activities.