Abstract
With the aim of improving the topical delivery of the antineoplastic drug 5-fluorouracil (5FU), it was loaded into ultradeformable liposomes composed of soy phosphatidylcholine and sodium cholate (UDL-5FU). The liposome populations had a mean size of 70 nm without significant changes in 56 days, and the ultradeformable formulations were up to 324-fold more elastic than conventional liposomes. The interaction between 5FU and the liposomal membrane was studied by three methods, and also release profile was obtained. UDL-5FU did penetrate the stratum corneum of human skin. At in vitro experiments, the formulation was more toxic on a human melanoma-derived than on a human keratinocyte-derived cell line. Cells captured liposomes by metabolically active processes. In vivo toxicity experiments were carried out in zebrafish (Danio rerio) larvae by studying the swimming activity, morphological changes, and alterations in the heart rate after incubation. UDL-5FU was more toxic than free 5FU. Therefore, this nano-formulation could be useful for topical application in deep skin precancerous lesions with advantages over current treatments. This is the first work that assessed the induction of apoptosis, skin penetration in a Saarbrücken penetration model, and the toxicological effects in vivo of an ultradeformable 5FU-loaded formulation.
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Acknowledgements
Jorge Montanari, María Jimena Prieto, C. Facundo Temprana, and Silvia del Valle Alonso are members of CONICET, Argentina. María Natalia Calienni acknowledges fellowships from CONICET Argentina and Ministero degli Affari Esteri e della Cooperazione Internazionale Italia. Authors would like to thank Dr. Humberto Jimenez for the skin explants, The Berry Store for providing the blueberry, and Dr. Juan Montes de Oca and Dr. Roberto Candal of INQUIMAE-CONICET.
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This work was supported by a grant from Universidad Nacional de Quilmes and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) (PIP 0358, 2014-2016).
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All animal procedures were performed in strict accordance with International Guidelines for animal care and maintenance. The protocols were approved by the Institutional Committee for the Care and Use of Laboratory Animals and the Ethic Committee of the National University of Quilmes (CE-UNQ 2/2014, CICUAL-UNQ 013-15 and CICUAL-UNQ 014-15) (Buenos Aires, Argentina).
All institutional and national guidelines for the care and use of laboratory animals were followed.
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Calienni, M.N., Temprana, C.F., Prieto, M.J. et al. Nano-formulation for topical treatment of precancerous lesions: skin penetration, in vitro, and in vivo toxicological evaluation. Drug Deliv. and Transl. Res. 8, 496–514 (2018). https://doi.org/10.1007/s13346-017-0469-1
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DOI: https://doi.org/10.1007/s13346-017-0469-1