Presence of Stromal Cells Enhances Epithelial-to-Mesenchymal Transition (EMT) Induction in Lung Bronchial Epithelium after Protracted Exposure to Oxidative Stress of Gamma Radiation

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Acheva , A , Haghdoost , S , Sollazzo , A , Launonen , V & Kämäräinen , M 2019 , ' Presence of Stromal Cells Enhances Epithelial-to-Mesenchymal Transition (EMT) Induction in Lung Bronchial Epithelium after Protracted Exposure to Oxidative Stress of Gamma Radiation ' , Oxidative medicine and cellular longevity , vol. 2019 , 4120379 . https://doi.org/10.1155/2019/4120379

Title: Presence of Stromal Cells Enhances Epithelial-to-Mesenchymal Transition (EMT) Induction in Lung Bronchial Epithelium after Protracted Exposure to Oxidative Stress of Gamma Radiation
Author: Acheva, Anna; Haghdoost, Siamak; Sollazzo, Alice; Launonen, Virpi; Kämäräinen, Meerit
Other contributor: University of Helsinki, Veterinary Pathology and Parasitology



Date: 2019-09-08
Language: eng
Number of pages: 14
Belongs to series: Oxidative medicine and cellular longevity
ISSN: 1942-0900
DOI: https://doi.org/10.1155/2019/4120379
URI: http://hdl.handle.net/10138/305932
Abstract: The aim of the study was to investigate the role of a microenvironment in the induction of epithelial-to-mesenchymal transition (EMT) as a sign of early stages of carcinogenesis in human lung epithelial cell lines after protracted low-dose rate gamma-radiation exposures. BEAS-2B and HBEC-3KT lung cell lines were irradiated with low-dose rate gamma-rays (Cs-137, 1.4 or 14 mGy/h) to 0.1 or 1 Gy with or without adding TGF-beta. TGF-beta-treated samples were applied as positive EMT controls and tested in parallel to find out if the radiation has a potentiating effect on the EMT induction. To evaluate the effect of the stromal component, the epithelial cells were irradiated in cocultures with stromal MRC-9 lung fibroblasts. On day 3 post treatment, the EMT markers: alpha-SMA, vimentin, fibronectin, and E-cadherin, were analyzed. The oxidative stress levels were evaluated by 8-oxo-dG analysis in both epithelial and fibroblast cells. The protracted exposure to low Linear Energy Transfer (LET) radiation at the total absorbed dose of 1 Gy was able to induce changes suggestive of EMT. The results show that the presence of the stromal component and its signaling (TGF-beta) in the cocultures enhances the EMT. Radiation had a minor cumulative effect on the TGF-beta-induced EMT with both doses. The oxidative stress levels were higher than the background in both epithelial and stromal cells post chronic irradiation (0.1 and 1 Gy); as for the BEAS-2B cell line, the increase was statistically significant. We suggest that the induction of EMT in bronchial epithelial cells by radiation requires more than single acute exposure and the presence of stromal component might enhance the effect through free radical production and accumulation.
Subject: CANCER-ASSOCIATED FIBROBLASTS
TGF-BETA
NUCLEOTIDE POOL
TUMOR-GROWTH
ACTIVATION
MICROENVIRONMENT
CARCINOGENESIS
MECHANISMS
8-OXO-DG
TARGET
1182 Biochemistry, cell and molecular biology
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