bims-mricoa 2022-05-08 papers

Issue of 2022–05–08
two papers selected by
Merve Yavuz, Bilkent University

RSC Adv. 2020 Aug 03. 10(48): 28786-28797

Magnetic hyperthermia with ε-Fe2O3 nanoparticles.

Yuanyu Gu, Marie Yoshikiyo, Asuka Namai, Debora Bonvin, Abelardo Martinez, Rafael Piñol, Pedro Téllez, Nuno J O Silva, Fredrik Ahrentorp, Christer Johansson, Joaquín Marco-Brualla, Raquel Moreno-Loshuertos, Patricio Fernández-Silva, Yuwen Cui, Shin-Ichi Ohkoshi, Angel Millán.

Biocompatibility restrictions have limited the use of magnetic nanoparticles for magnetic hyperthermia therapy to iron oxides, namely magnetite (Fe3O4) and maghemite (γ-Fe2O3). However, there is yet another magnetic iron oxide phase that has not been considered so far, in spite of its unique magnetic properties: ε-Fe2O3. Indeed, whereas Fe3O4 and γ-Fe2O3 have a relatively low magnetic coercivity, ε-Fe2O3 exhibits a giant coercivity. In this report, the heating power of ε-Fe2O3 nanoparticles in comparison with γ-Fe2O3 nanoparticles of similar size (∼20 nm) was measured in a wide range of field frequencies and amplitudes, in uncoated and polymer-coated samples. It was found that ε-Fe2O3 nanoparticles primarily heat in the low-frequency regime (20-100 kHz) in media whose viscosity is similar to that of cell cytoplasm. In contrast, γ-Fe2O3 nanoparticles heat more effectively in the high frequency range (400-900 kHz). Cell culture experiments exhibited no toxicity in a wide range of nanoparticle concentrations and a high internalization rate. In conclusion, the performance of ε-Fe2O3 nanoparticles is slightly inferior to that of γ-Fe2O3 nanoparticles in human magnetic hyperthermia applications. However, these ε-Fe2O3 nanoparticles open the way for switchable magnetic heating owing to their distinct response to frequency.

DOI: https://doi.org/10.1039/d0ra04361c

J Tissue Eng. 2022 Jan-Dec;13:13 20417314221085390

Application of microneedle patches for drug delivery; doorstep to novel therapies.

Fateme Nazary Abrbekoh, Leila Salimi, Sepideh Saghati, Hassan Amini, Sonia Fathi Karkan, Keyvan Moharamzadeh, Emel Sokullu, Reza Rahbarghazi.

In the past decade, microneedle-based drug delivery systems showed promising approaches to become suitable and alternative for hypodermic injections and can control agent delivery without side effects compared to conventional approaches. Despite these advantages, the procedure of microfabrication is facing some difficulties. For instance, drug loading method, stability of drugs, and retention time are subjects of debate. Besides, the application of novel refining fabrication methods, types of materials, and instruments are other issues that need further attention. Herein, we tried to summarize recent achievements in controllable drug delivery systems (microneedle patches) in vitro and in vivo settings. In addition, we discussed the influence of delivered drugs on the cellular mechanism and immunization molecular signaling pathways through the intradermal delivery route. Understanding the putative efficiency of microneedle patches in human medicine can help us develop and design sophisticated therapeutic modalities.

Keywords: Microneedle patches; delivery system; diabetes; drugs; transdermal injection

DOI: https://doi.org/10.1177/20417314221085390