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Redox-active, luminescent coordination nanosheet capsules containing magnetite.

ABSTRACT: Two-dimensional coordination nanosheets (CONASHs) are grown at the spherical liquid-liquid interface of a dichloromethane droplet in water to form zero-dimensional nano- and micro-capsules using a simple dropping method, a syringe-pump method, and an emulsion method. Reaction of 1,3,5-tris[4-(4'-2,2':6',2″-terpyridyl)phenyl]benzene (1) with Fe(BF₄)₂ affords electrochromic Fe(tpy)₂ CONASH capsules and that of ligand 1 with ZnSO₄ does photoluminescent Zn₂(μ-O₂SO₂)₂(tpy)₂ CONASH capsules. Fe(tpy)₂ CONASH capsules containing magnetite particles were produced by the syringe-pump method by adding magnetite to the aqueous phase, with the assembly and dispersion of the magnetite-containing CONASH capsules being easily controlled with a magnet. This indicates that physicochemically functional CONASH capsules are suitable for incorporating other functional materials to develop hybrid systems.

SUBMITTER: Arai R

PROVIDER: S-EPMC7429495 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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Redox-active, luminescent coordination nanosheet capsules containing magnetite.

Arai Ryo R Li Mengjuan M Toyoda Ryojun R Maeda Hiroaki H Nishihara Hiroshi H

Scientific reports 20200814 1

Two-dimensional coordination nanosheets (CONASHs) are grown at the spherical liquid-liquid interface of a dichloromethane droplet in water to form zero-dimensional nano- and micro-capsules using a simple dropping method, a syringe-pump method, and an emulsion method. Reaction of 1,3,5-tris[4-(4'-2,2':6',2″-terpyridyl)phenyl]benzene (1) with Fe(BF4)2 affords electrochromic Fe(tpy)2 CONASH capsules and that of ligand 1 with ZnSO4 does photoluminescent Zn ...[more]

PMID: 32796883

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Project description:Rationale: The tireless research for effective drug delivery approaches is prompted by poor target tissue penetration and limited selectivity against diseased cells. To overcome these issues, various nano- and micro-carriers have been developed so far, but some of them are characterized by slow degradation time, thus hampering repeated drug administrations. The aim of this study was to pursue a selective delivery of magnetic biodegradable polyelectrolyte capsules in a mouse breast cancer model, using an external magnetic field. Methods: Four different kinds of magnetic polyelectrolyte capsules were fabricated via layer-by-layer assembly of biodegradable polymers on calcium carbonate templates. Magnetite nanoparticles were embedded either into the capsules' shell (sample S) or both into the shell and the inner volume of the capsules (samples CnS, where n is the number of nanoparticle loading cycles). Samples were first characterized in terms of their relaxometric and photosedimentometric properties. In vitro magnetic resonance imaging (MRI) experiments, carried out on RAW 264.7 cells, allowed the selection of two lead samples that proceeded for the in vivo testing on a mouse breast cancer model. In the set of in vivo experiments, an external magnet was applied for 1 hour following the intravenous injection of the capsules to improve their delivery to tumor, and MRI scans were acquired at different time points post administration. Results: All samples were considered non-cytotoxic as they provided more than 76% viability of RAW 264.7 cells upon 2 h incubation. Sample S appeared to be the most efficient in terms of T2-MRI contrast, but the less sensitive to external magnet navigation, since no difference in MRI signal with and without the magnet was observed. On the other side, sample C6S was efficiently delivered to the tumor tissue, with a three-fold T2-MRI contrast enhancement upon the external magnet application. The effective magnetic targeting of C6S capsules was also confirmed by the reduction in T2-MRI contrast in spleen if compared with the untreated with magnet mice values, and the presence of dense and clustered iron aggregates in tumor histology sections even 48 h after the magnetic targeting. Conclusion: The highlighted strategy of magnetic biodegradable polyelectrolyte capsules' design allows for the development of an efficient drug delivery system, which through an MRI-guided externally controlled navigation may lead to a significant improvement of the anticancer chemotherapy performance.

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Redox-active, luminescent coordination nanosheet capsules containing magnetite.

Publications

Redox-active, luminescent coordination nanosheet capsules containing magnetite.

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