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• W1801497811 startingPage "466" @default.
• W1801497811 abstract "Natural polymers are used as components of nanoparticles (NPs) for drug delivery, as they provide targeted, sustained release and biodegradability. The purpose of this study was to increase the efficacy of the photodynamic therapy (PDT) by the combination of 5-aminolevulinic acid (ALA) with 5-fluorouracil-loaded-chitosan-nanoparticles (5-Fu-CNPs).Nanoparticles based on chitosan (CNPs) were synthesized by the ionic crosslinking method via the TPP addition. 5-Fluorouracil (5-Fu), a first-line anticancer drug, was loaded into these 5Fu-CNPs, and they were assayed as controlled delivery formulation. HeLa cells were incubated in the presence of 5Fu-CNPs for 24h, next ALA was added to the culture medium and 4h later, to complete the PDT, light irradiation took place. Analysis of cell viability, reactive oxygen species (ROS) production, observation of the apoptosis by fluorescence microscopy followed by analysis of caspase-3 activity were carried out.Spherical 5Fu-CNPs with a mean diameter of 324±43nm, were successfully synthesized and characterized by TEM and DLS. 5-Fu incorporation was achieved successfully (12.3μg 5Fu/mg CNP) and the maximum 5-Fu release took place at 2h. The combined administration of 5Fu-CNPs and PDT mediated by ALA (ALA-PDT) led to an improved efficacy of the antineoplastic treatment by generation of great cytotoxicity inducted through an increased ROS production. HeLa cells were destroyed by apoptosis through activation of caspase pathway.This study proves that combination therapy (photodynamic ALA+chemical 5-Fu+immunoadjuvant chitosan) may be an effective approach for the treatment of cancer." @default.
• W1801497811 created "2016-06-24" @default.
• W1801497811 creator A5025179447 @default.
• W1801497811 creator A5046750388 @default.
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• W1801497811 date "2015-09-01" @default.
• W1801497811 modified "2023-10-17" @default.
• W1801497811 title "Assessment of sequential combination of 5-fluorouracil-loaded-chitosan-nanoparticles and ALA-photodynamic therapy on HeLa cell line" @default.
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• W1801497811 doi "https://doi.org/10.1016/j.pdpdt.2015.05.001" @default.
• W1801497811 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25976508" @default.
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