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Issue 7, 2020
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Layered double hydroxide nanosheets: towards ultrasensitive tumor microenvironment responsive synergistic therapy

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Abstract

The tumor microenvironment (TME), which is characterised by high H2O2 and glutathione (GSH) levels, low pH value and hypoxia, imposes crucial influences on tumor therapeutic outcomes. Rational design and preparation of nanomaterial systems that are responsive to the intrinsic properties of the TME open a promising avenue towards tumor-specific treatment. Herein, CoMn-layered double hydroxide (CoMn-LDH) nanosheets were synthesized via a bottom-up method followed by surface modification with a photosensitizer, chlorin e6 (Ce6), which exhibited TME-responsive imaging as well as photodynamic and chemodynamic synergistic therapy (PDT/CDT). Due to their ultralow bond energy and large adsorption energy, CoMn-LDH nanosheets show fast self-degradability in a GSH (10 mM) microenvironment, giving an excellent CDT activity in mildly acidic conditions (pH = 6.5), superior GSH removal ability (99.82%) and O2 production (35.37 μg L−1 s−1). Moreover, Ce6/CoMn-LDH nanosheets display satisfactory photoacoustic (PA) imaging and GSH-enhanced magnetic resonance imaging (MRI) with a 45.1-fold T1-enhancement. In addition, both in vitro and in vivo therapeutic tests based on Ce6/CoMn-LDH demonstrate a satisfactory anticancer activity with complete cancer cell apoptosis and dramatic tumor elimination. This work provides a new perspective for the design of multifunctional 2D nanosheets towards a fully promoted TME-responsive synergistic therapy, which holds great promise for future clinical diagnosis and treatment.

Graphical abstract: Layered double hydroxide nanosheets: towards ultrasensitive tumor microenvironment responsive synergistic therapy

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Supplementary files

Article information


Submitted
18 Nov 2019
Accepted
08 Jan 2020
First published
09 Jan 2020

J. Mater. Chem. B, 2020,8, 1445-1455
Article type
Paper

Layered double hydroxide nanosheets: towards ultrasensitive tumor microenvironment responsive synergistic therapy

L. Yan, Y. Wang, T. Hu, X. Mei, X. Zhao, Y. Bian, L. Jin, R. Liang, X. Weng and M. Wei, J. Mater. Chem. B, 2020, 8, 1445
DOI: 10.1039/C9TB02591J

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