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Article

Electrostatically Driven Encapsulation of Hydrophilic, Non-Conformational Peptide Epitopes into Liposomes

1
Polymun Scientific Immunbiologische Forschung GmbH, 3400 Klosterneuburg, Austria
2
Department of Biotechnology, University of Natural Resources and Life Sciences, 1190 Vienna, Austria
3
Institute of Clinical and Molecular Virology, Universitätsklinikum Erlangen, 91054 Erlangen, Germany
4
FH Campus Wien - University of Applied Sciences, 1100 Vienna, Austria
*
Author to whom correspondence should be addressed.
Pharmaceutics 2019, 11(11), 619; https://doi.org/10.3390/pharmaceutics11110619
Received: 16 October 2019 / Revised: 1 November 2019 / Accepted: 12 November 2019 / Published: 18 November 2019
Since the first use of liposomes as carriers for antigens, much work has been done to elucidate the mechanisms involved in the encapsulation of vaccine-relevant biomolecules. However, only a few studies have specifically investigated the encapsulation of hydrophilic, non-conformational peptide epitopes. We performed comprehensive and systematic screening studies, in order to identify conditions that favor the electrostatic interaction of such peptides with lipid membranes. Moreover, we have explored bi-terminal sequence extension as an approach to modify the isoelectric point of peptides, in order to modulate their membrane binding behavior and eventually shift/expand the working range under which they can be efficiently encapsulated in an electrostatically driven manner. The findings of our membrane interaction studies were then applied to preparing peptide-loaded liposomes. Our results show that the magnitude of membrane binding observed in our exploratory in situ setup translates to corresponding levels of encapsulation efficiency in both of the two most commonly employed methods for the preparation of liposomes, i.e., thin-film hydration and microfluidic mixing. We believe that the methods and findings described in the present studies will be of use to a wide audience and can be applied to address the ongoing relevant issue of the efficient encapsulation of hydrophilic biomolecules. View Full-Text
Keywords: electrostatic interactions; encapsulation; encapsulation efficiency; hydrophilic peptides; in situ binding; liposomes; microfluidics; peptides; peptide-membrane interaction; vaccines electrostatic interactions; encapsulation; encapsulation efficiency; hydrophilic peptides; in situ binding; liposomes; microfluidics; peptides; peptide-membrane interaction; vaccines
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MDPI and ACS Style

Suleiman, E.; Damm, D.; Batzoni, M.; Temchura, V.; Wagner, A.; Überla, K.; Vorauer-Uhl, K. Electrostatically Driven Encapsulation of Hydrophilic, Non-Conformational Peptide Epitopes into Liposomes. Pharmaceutics 2019, 11, 619. https://doi.org/10.3390/pharmaceutics11110619

AMA Style

Suleiman E, Damm D, Batzoni M, Temchura V, Wagner A, Überla K, Vorauer-Uhl K. Electrostatically Driven Encapsulation of Hydrophilic, Non-Conformational Peptide Epitopes into Liposomes. Pharmaceutics. 2019; 11(11):619. https://doi.org/10.3390/pharmaceutics11110619

Chicago/Turabian Style

Suleiman, Ehsan, Dominik Damm, Mirjam Batzoni, Vladimir Temchura, Andreas Wagner, Klaus Überla, and Karola Vorauer-Uhl. 2019. "Electrostatically Driven Encapsulation of Hydrophilic, Non-Conformational Peptide Epitopes into Liposomes" Pharmaceutics 11, no. 11: 619. https://doi.org/10.3390/pharmaceutics11110619

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