Reference : CHARACTERIZATION AND OPTIMIZATION OF PEPTIDE ENCAPSULATION IN PEGYLATED LIPOSOMES

	Document type :	Scientific congresses and symposiums : Poster
	Discipline(s) :	Human health sciences : Pharmacy, pharmacology & toxicology
	To cite this reference:	http://hdl.handle.net/2268/39677

Title :	CHARACTERIZATION AND OPTIMIZATION OF PEPTIDE ENCAPSULATION IN PEGYLATED LIPOSOMES
Language :	English
Author, co-author :	Ducat, Emilie [Université de Liège - ULg > Département de pharmacie > Pharmacie galénique >]
	Brion, Michael [ > > ]
	Evrard, Brigitte [Université de Liège - ULg > Département de pharmacie > Pharmacie galénique >]
	Piel, Géraldine [Université de Liège - ULg > Département de pharmacie > Pharmacie galénique >]
Publication date :	2009
Page number :	A0
On invitation :	No
Audience :	International
Event name :	Pharmscifair
Event date :	du 9 au 12 juin 2009
Event place (city) :	Nice
Event country :	France
Abstract :	[en] Purpose: The purpose of this work is to study the peptide encapsulation into PEGylated liposomes. Two formulations (SPC:CHOL:mPEG-750-DSPE (47:47:6) or SPC:CHOL:mPEG-2000-DSPE (47:47:6)) were investigated. Methods: Blank SUV liposomes were prepared by the lipid film hydration and the encapsulation was achieved by applying freeze-thawing cycles. Because many factors may influence peptide entrapment (number of freeze-thawing cycles (NC), lipid concentration (LC), peptide concentration (PC), mixing time (MT) and liposome composition (COMP)), a design of experiment (DOE) was performed. Results: The screening permitted to identify two factors having a positive and significant influence on the encapsulation efficiencies (NC and LC) while the liposome composition had a relatively weak effect. For the second part of the DOE, the positive factors were optimized for liposomes containing mPEG2000. The obtained results revealed a theoretical optimum at 64.75±3.55% when 11 cycles were applied and for the following LC: 36.1mM SPC, 36.1mM CHOL and 4mM mPEG-2000-DSPE. Experimental results showed an encapsulation efficiency of 62.68±2.93%. Conclusion: The DOE led to significant improvement of encapsulation for liposomes containing mPEG2000. Thereafter, an optimization design for liposomes containing mPEG750 will be started. Acknowledgements: This work was supported by the Ministry of the Walloon Region.
Research units :	C.I.R.M.
Funders :	Région wallonne : Direction générale des Technologies, de la Recherche et de l'Energie - DGTRE
Name of the research project :	Peptides antagonistes d'oncoprotéines pour une thérapeutique du cancer du sein
Permalink :	http://hdl.handle.net/2268/39677

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