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Lipid-itraconazole interaction in lipid model membranes
R Brasseur1, E Goormaghtigh, J M Ruysschaert
1Laboratoire de Chimie Physique des Macromolécules aux Interfaces, Free University Brussels, Belgium.
The Journal of Pharmacy and Pharmacology
|March 1, 1991
Summary
Itraconazole, a fungal sterol-biosynthesis inhibitor, does not alter lipid membrane organization. Its molecular properties and interactions suggest it integrates seamlessly within the phospholipid bilayer, maintaining membrane integrity.
Area of Science:
- Biophysics
- Pharmacology
- Membrane Biology
Background:
- Itraconazole is a lipophilic antifungal agent inhibiting fungal sterol biosynthesis.
- Understanding its interaction with biological membranes is crucial for its therapeutic application and to predict potential side effects.
Purpose of the Study:
- To investigate the effects of itraconazole on the organization and dynamics of lipid membranes.
- To determine the molecular interactions and positional behavior of itraconazole within a phospholipid environment.
Main Methods:
- Differential scanning calorimetry (DSC) to measure membrane organization parameters.
- Infrared spectroscopy to assess molecular conformations and interactions.
- Conformational analysis to model itraconazole's position and volume in the lipid bilayer.
Main Results:
- Itraconazole does not disturb membrane organization parameters.
- Its molecular volume and position in the lipid membrane resemble dipalmitoyl phosphatidylcholine.
- The mean energy of interaction between itraconazole and phospholipids is -60.6 kJ/mol, indicating favorable integration.
- Itraconazole occupies a mean molecular area of 60 Ų/molecule at the lipid-water interface, similar to the pure lipid.
Conclusions:
- Itraconazole integrates into lipid membranes without disrupting their structural organization.
- The drug's biophysical properties allow for favorable interactions and accommodation within the phospholipid bilayer.
- These findings support the membrane compatibility of itraconazole during its use as an antifungal agent.