Magnetic hyperthermia and MRI relaxometry with dendrimer coated iron oxide nanoparticles

Introduction: Recently, some studies have focused on dendrimer nanopolymers as an MRI contrast agent or a vehicle for gene and drug delivery. Considering the suitable properties of these materials, they are appropriate candidates for coating iron oxide nanoparticles which are applied to magnetic hyperthermia. To the best of our knowledge, the novelty of this study is the investigation of fourth-generation dendrimer-coated iron oxide nanoparticles (G۴@IONPs) in magnetic hyperthermia and MR imaging. Materials and Methods: IONPs were synthesized via co-precipitation and coated with the fourth generation (G۴) of poly amidoamine (PAMAM) dendrimer. The cytotoxicity of G۴@IONPs with different concentrations was assessed in hum a breast cancer cell line (MCF۷) and human fibroblast cell line (HDF۱). Hemolysis and stability of G۴@IONPs were investigated and also, the interaction of these particles with MCF۷ cells was assessed by Prussian blue staining. Heat generation and specific absorption rate (SAR) were calculated from measurement and simulation results at ۲۰۰ and ۳۰۰ kHz. MCF۷ and HDF۱ cells were incubated with G۴@IONPs for ۲ h and then put into the magnetic coil for ۱۲۰ min. relaxometry experiments were performed with different concentrations of G۴@IONPs with T۱ and T۲-weighted MR images.   Results: The TEM results showed that G۴@IONPs were ۱۰±۴ nm. The in vitro toxicity assessments showed that synthesized NPs had low toxicity. The viability of MCF۷ cells incubated with G۴@IONPs decreased significantly after magnetic. Also, MR imaging revealed that G۴@IONPs improved transverse relaxivity (r۲) significantly.   Conclusion: Our results encouraged the future application of G۴@IONPs in magnetic hyperthermia and MR imaging.

کلیدواژه ها:

Magnetic hyperthermia MRI ، Iron oxide ، Nanoparticles Dendrimer