RESUMEN
AIM: We studied externally controlled anticancer effects of binding tumor growth inhibiting synthetic peptides to magnetoelectric nanoparticles (MENs) on treatment of glioblastomas. METHODS: Hydrothermally synthesized 30-nm MENs had the core-shell composition of CoFe2O4@BaTiO3. Molecules of growth hormone-releasing hormone antagonist of the MIA class (MIA690) were chemically bound to MENs. In vitro experiments utilized human glioblastoma cells (U-87MG) and human brain microvascular endothelial cells. RESULTS: The studies demonstrated externally controlled high-efficacy binding of MIA690 to MENs, targeted specificity to glioblastoma cells and on-demand release of the peptide by application of d.c. and a.c. magnetic fields, respectively. CONCLUSION: The results support the use of MENs as an effective drug delivery carrier for growth hormone-releasing hormone antagonists in the treatment of human glioblastomas.
Asunto(s)
Antineoplásicos/química , Neoplasias Encefálicas/tratamiento farmacológico , Portadores de Fármacos/química , Glioblastoma/tratamiento farmacológico , Hormona del Crecimiento/antagonistas & inhibidores , Nanopartículas de Magnetita/química , Péptidos/química , Antineoplásicos/administración & dosificación , Compuestos de Bario/química , Encéfalo/irrigación sanguínea , Línea Celular Tumoral , Supervivencia Celular/efectos de los fármacos , Cobalto/química , Liberación de Fármacos , Células Endoteliales/citología , Células Endoteliales/efectos de los fármacos , Compuestos Férricos/química , Hormona del Crecimiento/metabolismo , Antagonistas de Hormonas/uso terapéutico , Humanos , Campos Magnéticos , Microvasos/citología , Nanosferas/química , Tamaño de la Partícula , Péptidos/administración & dosificación , Titanio/químicaRESUMEN
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RESUMEN
Magnetoelectric (ME) nanoparticles (MENs) intrinsically couple magnetic and electric fields. Using them as nuclear magnetic resonance (NMR) sensitive nanoprobes adds another dimension for NMR detection of biological cells based on the cell type and corresponding particle association with the cell. Based on ME property, for the first time we show that MENs can distinguish different cancer cells among themselves as well as from their normal counterparts. The core-shell nanoparticles are 30 nm in size and were not superparamagnetic. Due to presence of the ME effect, these nanoparticles can significantly enhance the electric field configuration on the cell membrane which serves as a signature characteristic depending on the cancer cell type and progression stage. This was clearly observed by a significant change in the NMR absorption spectra of cells incubated with MENs. In contrast, conventional cobalt ferrite magnetic nanoparticles (MNPs) did not show any change in the NMR absorption spectra. We conclude that different membrane properties of cells which result in distinct MEN organization and the minimization of electrical energy due to particle binding to the cells contribute to the NMR signal. The nanoprobe based NMR spectroscopy has the potential to enable rapid screening of cancers and impact next-generation cancer diagnostic exams.
RESUMEN
AIM: The in vivo study on imprinting control region mice aims to show that magnetoelectric nanoparticles may directly couple the intrinsic neural activity-induced electric fields with external magnetic fields. METHODS: Approximately 10 µg of CoFe2O4-BaTiO3 30-nm nanoparticles have been intravenously administrated through a tail vein and forced to cross the blood-brain barrier via a d.c. field gradient of 3000 Oe/cm. A surgically attached two-channel electroencephalography headmount has directly measured the modulation of intrinsic electric waveforms by an external a.c. 100-Oe magnetic field in a frequency range of 0-20 Hz. RESULTS: The modulated signal has reached the strength comparable to that due the regular neural activity. CONCLUSION: The study opens a pathway to use multifunctional nanoparticles to control intrinsic fields deep in the brain.