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Published in: Journal of Cancer Research and Clinical Oncology 10/2015

01-10-2015 | Original Article – Cancer Research

Paraoxonase-2 (PON2) protects oral squamous cell cancer cells against irradiation-induced apoptosis

Authors: Maximilian Krüger, Andreas Max Pabst, Bilal Al-Nawas, Sven Horke, Maximilian Moergel

Published in: Journal of Cancer Research and Clinical Oncology | Issue 10/2015

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Abstract

Purpose

Patients with oral squamous cell carcinomas (OSCC) often receive radiotherapy to preferentially induce apoptosis of cancer cells through generation of overwhelming DNA damage. This is amplified by generation of reactive oxygen species (ROS), thereby causing oxidative stress and cell death. However, tumors resist through different mechanisms, including upregulation of anti-apoptotic factors and enhanced ROS resistance. We recently reported that the antioxidative enzyme PON2 significantly enhances cellular stress resistance by attenuating mitochondrial ROS-mediated apoptosis. Further, PON2 is often upregulated in cancer. This prompted us to investigate its yet unknown role in the protection of OSCC against irradiation-induced cell death.

Methods

PON2 expression was determined after 7 Gy singular irradiation in four OSCC cell lines (PCI-13, PCI-52, SCC-4, SCC-68) accompanied by the detection of caspase 3/7 activity. A direct role of PON2 was tested by siRNA-mediated knockdown. In vivo PON2 expression was tested in five patients with oral carcinoma and compared with healthy mucosa for the evaluation of clinical significance.

Results

PON2 is variably expressed in OSCC in vitro and in vivo. Compared with the other cell lines, SCC-4 cells showed twofold more basal PON2 (p ≤ 0.05) and the lowest caspase 3/7 activity after singular irradiation (p ≤ 0.05). Contrarily, irradiation led to 1.2-fold induction of PON2 in PCI-13 with no effect on SCC-4 (≤0.05), suggesting that PON2 levels reflect the cells’ irradiation sensitivity. In agreement, PON2 knockdown resulted in significant higher apoptosis rates (p ≤ 0.05).

Conclusion

Our findings give first evidence that upregulation of PON2 may protect OSCC against irradiation-induced apoptosis.
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Metadata
Title
Paraoxonase-2 (PON2) protects oral squamous cell cancer cells against irradiation-induced apoptosis
Authors
Maximilian Krüger
Andreas Max Pabst
Bilal Al-Nawas
Sven Horke
Maximilian Moergel
Publication date
01-10-2015
Publisher
Springer Berlin Heidelberg
Published in
Journal of Cancer Research and Clinical Oncology / Issue 10/2015
Print ISSN: 0171-5216
Electronic ISSN: 1432-1335
DOI
https://doi.org/10.1007/s00432-015-1941-2

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