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Issue 22, 2019
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Induction of mTOR-dependent autophagy by WS2 nanosheets from both inside and outside of human cells

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Abstract

The applications of two-dimensional transition metal dichalcogenides (2D TMDCs) pose an increased risk to both the environment and human health. Due to the large surface area of 2D nanosheets, they often form multi-layered nanoclusters of various thicknesses in aqueous solution. In this work, we address the safety issue of 2D TMDCs with focus on the cellular effects of the thickness of WS2 nanosheets. At a very low and non-lethal concentration (4 cm2 mL−1 or 25 μg mL−1), 4-layered WS2 nanosheets (WS2-4) were primarily bound to the cell surface with less internalization, while 30-layered WS2 nanosheets (WS2-30) were mostly internalized by human bronchial epithelial cells. Although the cellular interactions at this low concentration caused no alterations in the cell cycle, apoptosis, necrosis and cytotoxicity, cell autophagy was induced in both cases through mTOR-dependent pathways by perturbing a number of signaling molecules, such as amyloid precursor protein (APP) and cysteine-X-cysteine chemokine receptor 4 (CXCR-4). The finding of activation of cell autophagy from both outside and inside of cells reveals a novel feature of biological perturbations by 2D nanosheets. This finding will help in the formulation of general guidelines for the safe application of 2D nanomaterials.

Graphical abstract: Induction of mTOR-dependent autophagy by WS2 nanosheets from both inside and outside of human cells

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Article information


Submitted
03 Apr 2019
Accepted
07 May 2019
First published
08 May 2019

Nanoscale, 2019,11, 10684-10694
Article type
Paper

Induction of mTOR-dependent autophagy by WS2 nanosheets from both inside and outside of human cells

X. Zhou and B. Yan, Nanoscale, 2019, 11, 10684
DOI: 10.1039/C9NR02850A

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