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Sequestration of amitriptyline by liposomes.
Marissa S Fallon1, Anuj Chauhan
1Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA.
Journal of Colloid and Interface Science
|April 29, 2006
Summary
This study investigates how liposomes interact with amitriptyline, a drug causing overdose fatalities. Negatively charged liposomes effectively sequester amitriptyline, showing potential for drug detoxification strategies.
Area of Science:
- Pharmacology
- Biochemistry
- Materials Science
Background:
- Amitriptyline overdose is a significant cause of fatalities.
- Liposomes are widely used in drug delivery and biomaterial applications.
- Understanding drug-liposome interactions is crucial for therapeutic and detoxification strategies.
Purpose of the Study:
- To investigate the uptake of amitriptyline by 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) liposomes and DMPC:1,2-dioleoyl-sn-glycero-3-[phospho-rac(1-glycerol)] (DOPG) liposomes.
- To determine the influence of drug concentration, liposomal charge, pH, salt, and protein presence on amitriptyline uptake.
- To assess the potential of liposomes for amitriptyline detoxification.
Main Methods:
- Utilized precipitation and centrifugation methods to quantify drug uptake.
- Employed qualitative observations at high pH and conductivity measurements at neutral pH to study uptake kinetics.
- Investigated drug uptake in the presence of bovine serum albumin (BSA) to mimic physiological conditions.
Main Results:
- Amitriptyline uptake was rapid, occurring in less than 5 seconds.
- Fractional drug uptake decreased with increasing drug concentration but increased with pH and decreased with salt.
- Negatively charged DMPC:DOPG liposomes showed higher amitriptyline sequestration than neutral DMPC liposomes.
- Liposomes significantly reduced free drug concentration, with a 50:50 DMPC:DOPG formulation reducing it by approximately 3.5-fold in the presence of BSA.
Conclusions:
- Liposome-amitriptyline interactions are driven by both electrostatic and hydrophobic effects.
- Liposomes, particularly negatively charged ones, demonstrate high efficacy in sequestering amitriptyline.
- These findings highlight the potential of liposomes as a promising approach for amitriptyline detoxification.