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Paclitaxel partitioning into lipid bilayers

M R Wenk1, A Fahr, R Reszka

  • 1Department of Biophysics, University of Basel, Switzerland.

Journal of Pharmaceutical Sciences
|February 1, 1996
PubMed
Summary
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Paclitaxel, an anticancer drug, faces solubility challenges. This study quantifies its binding to lipid vesicles, revealing an enthalpy-driven interaction crucial for drug delivery systems.

Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Pharmacology

Background:

  • Paclitaxel (Taxol) is a vital anticancer drug with a unique cytostatic mechanism.
  • Poor water solubility hinders paclitaxel's therapeutic application.
  • Lipid-based formulations are explored to enhance paclitaxel bioavailability.

Purpose of the Study:

  • To determine the partition coefficient of paclitaxel into small unilamellar lipid vesicles.
  • To elucidate the thermodynamic driving forces behind paclitaxel's interaction with lipid bilayers.

Main Methods:

  • High-sensitivity titration calorimetry.
  • Fluorescence spectrometry.
  • Partitioning studies using 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine vesicles.

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Main Results:

  • Partition coefficient (Kp) of approximately 9,500 M⁻¹.
  • Partition enthalpy (ΔH) of -25 ± 3 kcal mol⁻¹.
  • Free energy of binding (ΔG) of -7.9 kcal mol⁻¹.

Conclusions:

  • Paclitaxel's binding to lipid vesicles is strongly enthalpy-driven, suggesting favorable van der Waals interactions.
  • Temperature significantly impacts paclitaxel's solubility in lipid phases, decreasing by a factor of 4 per 10°C increase.
  • These findings are critical for designing effective liposome-based paclitaxel delivery systems.