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Beola, Lilianne; Asín, Laura; Fratila, Raluca M; Herrero, Vanessa; de la Fuente, Jesús M; Grazú, Valeria; Gutiérrez, Lucía
ACS applied materials & interfaces, 12/2018, Letnik: 10, Številka: 51Journal Article
Magnetic hyperthermia is a promising therapy for the localized treatment of cancer based on the exposure of magnetic nanoparticles to an external alternating magnetic field. In order to evaluate some of the mechanisms involved in the cellular damage caused by this treatment, two different 3D cell culture models were prepared using collagen, which is the most abundant protein of the extracellular matrix. The same amount of nanoparticles was added to cells either before or after their incorporation into the 3D structure. Therefore, in one model, particles were located only inside cells (In model), while the other one had particles both inside and outside cells (In&Out model). In the In&Out model, the hyperthermia treatment facilitated the migration of the particles from the outer areas of the 3D structure to the inner parts, achieving a faster homogeneous distribution throughout the whole structure and allowing the particles to gain access to the inner cells. The cell death mechanism activated by the magnetic hyperthermia treatment was different in both models. Necrosis was observed in the In model and apoptosis in the In&Out model 24 h after the hyperthermia application. This was clearly correlated with the amount of nanoparticles located inside the cells. Thus, the combination of both 3D models allowed us to demonstrate two different roles of the magnetic particles during the hyperthermia treatment: (i) The modulation of the cell death mechanism depending on the amount of intracellular particles and (ii) the disruption of the collagen matrix caused by the extracellular nanoparticles.
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