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Updated: Jul 14, 2026
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Fluorescence-Based Measurements of Phosphatidylserine/Phosphatidylinositol 4-Phosphate Exchange Between Membranes
Published on: March 14, 2021
Oxidized phospholipids as potential novel drug targets
Juha-Pekka Mattila1, Karen Sabatini, Paavo K J Kinnunen
1Helsinki Biophysics and Biomembrane Group, Institute of Biomedicine/Medical Biochemistry, FIN-00014, University of Helsinki, Helsinki, Finland.
Biophysical Journal
|July 3, 2007
Summary
Three drugs, including antipsychotics and an anticancer agent, bind strongly to oxidized phospholipids. Their interactions reveal distinct hydrophobic and electrostatic binding mechanisms, relevant to drug-induced oxidative stress and clinical side effects.
Area of Science:
- Pharmacology
- Biochemistry
- Oxidative Stress Research
Background:
- Therapeutic agents can interact with cellular lipids, potentially leading to oxidative stress.
- Oxidatively modified phospholipids (PCs) are implicated in various disease states.
- Understanding drug-lipid interactions is crucial for explaining drug efficacy and side effects.
Purpose of the Study:
- To investigate the binding interactions of antipsychotics (HPD, CPZ) and an anthracycline (DOX) with oxidatively modified phospholipids.
- To elucidate the driving forces (hydrophobic vs. electrostatic) behind these drug-lipid interactions.
- To connect these findings to the known induction of oxidative stress by these drugs.
Main Methods:
- Utilized fluorescence quenching of a pyrene-labeled lipid derivative to monitor drug-phospholipid interactions.
- Studied binding affinities of HPD, CPZ, and DOX to two types of oxidized PCs (aldehyde and carboxylic functions).
- Investigated drug dissociation from oxidized lipids using DNA, acidic phospholipids, and NaCl to determine binding characteristics.
Main Results:
- All three drugs exhibited avid binding to both aldehyde and carboxylic oxidized PCs.
- Chlorpromazine (CPZ) showed the highest affinity for the oxidized lipid with a carboxylic function.
- Binding to aldehyde lipids was primarily hydrophobic, while binding to carboxylic lipids involved significant electrostatic contributions.
Conclusions:
- Drug binding to oxidized phospholipids is a key factor in their biological activity and potential toxicity.
- The distinct binding mechanisms (hydrophobic/electrostatic) explain varied drug interactions with membrane phospholipids.
- These findings provide a molecular basis for understanding drug-induced oxidative stress and associated clinical side effects.
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