1. L-tyrosine-loaded nanoparticles increase the antitumoral activity of direct electric current in a metastatic melanoma cell model.
- Author
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de Campos VE, Teixeira CA, da Veiga VF, Ricci E Jr, and Holandino C
- Subjects
- Animals, Antineoplastic Agents chemistry, Cell Line, Tumor, Cell Proliferation drug effects, Cell Survival drug effects, Combined Modality Therapy, Electrochemical Techniques, Melanoma, Experimental drug therapy, Melanoma, Experimental pathology, Mice, Microscopy, Electron, Transmission, Nanoparticles chemistry, Nanoparticles ultrastructure, Particle Size, Polyesters chemistry, Trypan Blue, Tyrosine chemistry, Antineoplastic Agents administration & dosage, Electric Stimulation Therapy methods, Melanoma, Experimental therapy, Nanoparticles administration & dosage, Tyrosine administration & dosage
- Abstract
Inhibition of tumor growth induced by treatment with direct electric current (DC) has been reported in several models. One of the mechanisms responsible for the antitumoral activity of DC is the generation of oxidative species, known as chloramines. With the aim of increasing chloramine production in the electrolytic medium and optimizing the antitumoral effects of DC, poly(ɛ-caprolactone) (PCL) nanoparticles (NPs) loaded with the amino acid tyrosine were obtained. The physical-chemical characterization showed that the NPs presented size in nanometric range and monomodal distribution. A slightly negative electrokinetic potential was also found in both blank NPs and L-tyrosine-loaded PCL NPs. The yield of the loading process was approximately 50%. Within 3 h of dissolution assay, a burst release of about 80% L-tyrosine was obtained. The in vitro cytotoxicity of DC was significantly increased when associated with L-tyrosine-loaded NPs, using a murine multidrug-resistant melanoma cell line model. This study showed that the use of the combination of nanotechnology and DC has a promising antineoplastic potential and opens a new perspective in cancer therapy.
- Published
- 2010
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