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Epigenetic and Glucocorticoid Receptor-Mediated Regulation of Glutathione Peroxidase 3 in Lung Cancer Cells

  • An, Byung Chull (Department of Anatomy, Chonnam National University Medical School) ;
  • Jung, Nak-Kyun (Department of Anatomy, Chonnam National University Medical School) ;
  • Park, Chun Young (Department of Pathology, Chonnam National University Medical School) ;
  • Oh, In-Jae (Department of Internal Medicine, Chonnam National University Medical School) ;
  • Choi, Yoo-Duk (Department of Pathology, Chonnam National University Medical School) ;
  • Park, Jae-Il (Animal Facility of Aging Science, Korea Basic Science Institute) ;
  • Lee, Seung-won (Department of Anatomy, Chonnam National University Medical School)
  • Received : 2016.06.29
  • Accepted : 2016.07.22
  • Published : 2016.08.31

Abstract

Glutathione peroxidase 3 (GPx3), an antioxidant enzyme, acts as a modulator of redox signaling, has immunomodulatory function, and catalyzes the detoxification of reactive oxygen species (ROS). GPx3 has been identified as a tumor suppressor in many cancers. Although hyper-methylation of the GPx3 promoter has been shown to down-regulate its expression, other mechanisms by which GPx3 expression is regulated have not been reported. The aim of this study was to further elucidate the mechanisms of GPx3 regulation. GPx3 gene analysis predicted the presence of ten glucocorticoid response elements (GREs) on the GPx3 gene. This result prompted us to investigate whether GPx3 expression is regulated by the glucocorticoid receptor (GR), which is implicated in tumor response to chemotherapy. The corticosteroid dexamethasone (Dex) was used to examine the possible relationship between GR and GPx3 expression. Dex significantly induced GPx3 expression in H1299, H1650, and H1975 cell lines, which exhibit low levels of GPx3 expression under normal conditions. The results of EMSA and ChIP-PCR suggest that GR binds directly to GRE 6 and 7, both of which are located near the GPx3 promoter. Assessment of GPx3 transcription efficiency using a luciferase reporter system showed that blocking formation of the GR-GRE complexes reduced luciferase activity by 7-8-fold. Suppression of GR expression by siRNA transfection also induced down-regulation of GPx3. These data indicate that GPx3 expression can be regulated independently via epigenetic or GR-mediated mechanisms in lung cancer cells, and suggest that GPx3 could potentiate glucocorticoid (GC)-mediated anti-infla-mmatory signaling in lung cancer cells.

Acknowledgement

Supported by : Chonnam National University Hospital Biomedical, National Research Foundation of Korea(NRF)

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