Docetaxel-loaded liposomes: The effect of lipid composition and purification on drug encapsulation and in vitro toxicity

Pereira, Sara, Egbu, Raphael, Jannati, Gemma and Al-Jamal, Wafa' T (2016) Docetaxel-loaded liposomes: The effect of lipid composition and purification on drug encapsulation and in vitro toxicity. International Journal of Pharmaceutics, 514 (1). pp. 150-159. ISSN 0378-5173

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Abstract

Docetaxel (DTX)-loaded liposomes have been formulated to overcome DTX solubility issue, improve its efficacy and reduce its toxicity. This study investigated the effect of steric stabilisation, varying liposome composition, and lipid:drug molar ratio on drug loading and on the physicochemical properties of the DTX-loaded liposomes. Size exclusion chromatography (SEC) was used to remove free DTX from the liposomal formulation, and its impact on drug loading and in vitro cytotoxicity was also evaluated. Liposomes composed of fluid, unsaturated lipid (DOPC:Chol:DSPE-PEG2000) showed the highest DTX loading compared to rigid, saturated lipids (DPPC:Chol:DSPE-PEG2000 and DSPC:Chol:DSPE-PEG2000). The inclusion of PEG showed a minimum effect on DTX encapsulation. Decreasing lipid:drug molar ratio from 40:1 to 5:1 led to an improvement in the loading capacities of DOPC-based liposomes only. Up to 3.6-fold decrease in drug loading was observed after liposome purification, likely due to the loss of adsorbed and loosely entrapped DTX in the SEC column. Our in vitro toxicity results in PC3 monolayer showed that non-purified, DTX-loaded DOPC:Chol liposomes were initially (24h) more potent than the purified ones, due to the fast action of the surface- adsorbed drug. However, we hypothesize that over time (48 and 72h) the purified, DTX-loaded DOPC:Chol liposomes became more toxic due to high intracellular release of encapsulated DTX. Finally, our cytotoxicity results in PC3 spheroids showed the superior activity of DTX-loaded liposomes compared to free DTX, which could overcome the DTX poor tissue penetration, drug resistance, and improve its therapeutic efficacy following systemic administration.

Item Type:	Article
Additional Information:	Crown Copyright © 2016. Published by Elsevier B.V. All rights reserved.
Uncontrolled Keywords:	docetaxel,liposome,purification,spheroid,prostate cancer,pc3,sdg 3 - good health and well-being ,/dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_being
Faculty \ School:	Faculty of Science > School of Pharmacy
UEA Research Groups:	Faculty of Science > Research Groups > Drug Delivery and Pharmaceutical Materials (former - to 2017)
Depositing User:	Pure Connector
Date Deposited:	30 Nov 2016 00:01
Last Modified:	21 Oct 2022 07:33
URI:	https://ueaeprints.uea.ac.uk/id/eprint/61518
DOI:	10.1016/j.ijpharm.2016.06.057

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