RT Journal Article
T1 Combined Magnetic Hyperthermia and Photothermia with Polyelectrolyte/Gold-Coated Magnetic Nanorods
A1 Lazaro, Marina
A1 Lupianez, Pablo
A1 Arias, Jose L.
A1 Carrasco-Jimenez, Maria P.
A1 Delgado, Angel, V
A1 Iglesias, Guillermo R.
K1 gold coating
K1 hyperthermia
K1 magnetic nanoparticles
K1 nanorods
K1 photothermia
K1 polyelectrolyte layer
K1 polyethyleneimine
AB Magnetite nanorods (MNRs) are synthesized based on the use of hematite nanoparticles of the desired geometry and dimensions as templates. The nanorods are shown to be highly monodisperse, with a 5:1 axial ratio, and with a 275 nm long semiaxis. The MNRs are intended to be employed as magnetic hyperthermia and photothermia agents, and as drug vehicles. To achieve a better control of their photothermia response, the particles are coated with a layer of gold, after applying a branched polyethyleneimine (PEI, 2 kDa molecular weight) shell. Magnetic hyperthermia is performed by application of alternating magnetic fields with frequencies in the range 118-210 kHz and amplitudes up to 22 kA/m. Photothermia is carried out by subjecting the particles to a near-infrared (850 nm) laser, and three monochromatic lasers in the visible spectrum with wavelengths 480 nm, 505 nm, and 638 nm. Best results are obtained with the 505 nm laser, because of the proximity between this wavelength and that of the plasmon resonance. A so-called dual therapy is also tested, and the heating of the samples is found to be faster than with either method separately, so the strengths of the individual fields can be reduced. Due to toxicity concerns with PEI coatings, viability of human hepatoblastoma HepG2 cells was tested after contact with nanorod suspensions up to 500 mu g/mL in concentration. It was found that the cell viability was indistinguishable from control systems, so the particles can be considered non-cytotoxic in vitro. Finally, the release of the antitumor drug doxorubicin is investigated for the first time in the presence of the two external fields, and of their combination, with a clear improvement in the rate of drug release in the latter case.
PB MDPI AG
YR 2022
FD 2022-11-07
LK http://hdl.handle.net/10668/21566
UL http://hdl.handle.net/10668/21566
LA en
NO Lázaro M, Lupiáñez P, Arias JL, Carrasco-Jiménez MP, Delgado ÁV, Iglesias GR. Combined Magnetic Hyperthermia and Photothermia with Polyelectrolyte/Gold-Coated Magnetic Nanorods. Polymers (Basel). 2022 Nov 14;14(22):4913
NO This research was funded by Junta de Andalucía, Spain, Consejería de Economía y Conocimiento/Proyectos de I + D + I del Plan Andaluz de Investigación, Desarrollo e Innovación/Grants P20_00346, P20_00233. Ministerio de Ciencia e Innovación, Spain, Plan Estatal I+D+I 2017-2020/Grant EQC2019-005930-P. Ministerio de Economía y Competitividad, Spain, Grant PID2019-109294RB-100.
DS RISalud
RD Sep 7, 2025