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Rational Design of Cholesterol Derivative for Improved Stability of Paclitaxel Cationic Liposomes
Jasmin Monpara1, Chryso Kanthou2, Gillian M Tozer2
1Department of Pharmaceutical Sciences and Technology, University under Section 3 of UGC Act - 1956, Elite Status and Center of Excellence - Govt. of Maharashtra, TEQIP Phase II Funded, Institute of Chemical Technology, Mumbai, 400019, India.
A new cationic cholesterol derivative, Cholesteryl Arginine Ethylester (CAE), enhances paclitaxel (PTX) loading and stability in liposomes. This novel ligand improves drug delivery and shows no genotoxicity in vitro.
Area of Science:
- Lipid-based drug delivery systems
- Nanomedicine and targeted therapies
- Molecular dynamics simulations in pharmaceutics
Background:
- Development of effective drug delivery systems is crucial for enhancing therapeutic efficacy and reducing side effects.
- Paclitaxel (PTX) is a widely used chemotherapeutic agent with limited solubility and bioavailability.
- Cationic liposomes offer potential advantages in drug encapsulation and cellular interaction.
Purpose of the Study:
- To synthesize and characterize a novel cholesterol derivative, Cholesteryl Arginine Ethylester (CAE).
- To prepare and evaluate cationic liposomes incorporating CAE for improved paclitaxel (PTX) delivery.
- To investigate the interaction of PTX and CAE within the liposome membrane using molecular dynamics (MD) simulations and biophysical techniques.
Main Methods:
- Synthesis and characterization of CAE.
- Preparation of cationic liposomes (SPC/CAE/PTX) and conventional liposomes (SPC/cholesterol/PTX).
- MD simulations (10 ns) to study drug-membrane interactions.
- Differential Scanning Calorimetry (DSC) and Small Angle Neutron Scattering (SANS) for physical characterization.
- In vitro efficacy studies (MTT assay, endothelial cell migration assay) and safety assessment (Comet Assay).
Main Results:
- Cationic liposomes exhibited enhanced PTX loading efficiency and improved physical stability compared to conventional liposomes.
- MD simulations revealed hydrogen bonding between CAE and PTX, facilitating deeper PTX penetration into the bilayer.
- DSC indicated that CAE inclusion eliminates the glass transition temperature (Tg) of the DPPC bilayer, while SANS showed a more pronounced membrane thickening effect than cholesterol.
- Cationic liposomes demonstrated slightly improved cytotoxicity and enhanced endothelial cell migration inhibition.
- The Comet Assay confirmed that CAE alone is not genotoxic.
Conclusions:
- The novel cationic ligand CAE effectively retains paclitaxel within the phospholipid bilayer.
- CAE-based cationic liposomes offer improved drug loading and enhanced physical stability for PTX delivery.
- These findings suggest CAE as a promising component for developing advanced lipid-based nanocarriers for chemotherapy.
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