Autophagy Regulates the Wnt/GSK3β/β-catenin/cyclin D1 Pathway in Mesenchymal Stem Cells (MSCs) Exposed to Titanium Dioxide Nanoparticles (TiONPs)

Overview

Journal Toxicol Rep

Date 2020 Sep 30

PMID 32995296

Citations 1

Authors

Shunbang Yu

Feng Wang

Yujie Bi

Pu Wang

Rui Zhang

Joanna Bohatko-Naismith

Xudong Zhang

He Wang

Affiliations

Soon will be listed here.

Abstract

The application of titanium dioxide nanoparticles (TiONPs) is on the increase, and so the number of studies dedicated to describing this material's biological effects. Previous studies have presented results indicating the controversial impact of TiONPs on cell fate regarding death and survival. We speculate that this may be due to focusing on each of the subject cells as an isolated individual. In this study, we made a difference by looking at the subject cells as an interrelated population. Specifically, we exposed mesenchymal stem cells (MSCs) to TiONPs and observed cell death and stimulation of proliferation among the cell population. Our data shows that the exposure to TiONPs initiated autophagy, which led to an increase in extracellular Wnt protein levels and increased Wnt/GSK3β/β-catenin/cyclin D1 signalling in the cell population. Autophagy inhibitor repressed the effects of TiONPs, which indicates that β-catenin regulation was dependent on TiONPs-induced autophagy. The inhibition of β-catenin resulted in dysregulation of cyclin D1 protein expression level. In conclusion, following exposure to TiONPs, MSCs undergo autophagy, which induces cell proliferation among the cell population by upregulation of cyclin D1 through the Wnt/GSK3β/β-catenin pathway.

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