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Exposure of Barrett’s and esophageal adenocarcinoma cells to bile acids activates EGFR–STAT3 signaling axis via induction of APE1

Oncogene volume 37, pages 6011–6024 (2018)Cite this article

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Abstract

The development of Barrett’s esophagus (BE) and its progression to esophageal adenocarcinoma (EAC) is highly linked to exposure to acidic bile salts due to chronic gastroesophageal reflux disease (GERD). In this study, we investigated the role of Apurinic/apyrimidinic endonuclease 1/redox effector factor-1 (APE1/REF-1) in STAT3 activation in response to acidic bile salts. Our results indicate that APE1 is constitutively overexpressed in EAC, whereas its expression is transiently induced in response to acidic bile salts in non-neoplastic BE. Using overexpression or shRNA knockdown of APE1, we found that APE1 is required for phosphorylation, nuclear localization, and transcriptional activation of STAT3. By using an APE1 redox-specific mutant (C65A) and APE1 redox inhibitor (E3330), we demonstrate that APE1 activates STAT3 in a redox-dependent manner. By using pharmacologic inhibitors and genetic knockdown systems, we found that EGFR is a required link between APE1 and STAT3. EGFR phosphorylation (Y1068) was directly associated with APE1 levels and redox function. Co-immunoprecipitation and proximity ligation assays indicated that APE1 coexists and interacts with the EGFR–STAT3 protein complex. Consistent with these findings, we demonstrated a significant induction in mRNA expression levels of STAT3 target genes (IL-6, IL-17A, BCL-xL, Survivin, and c-MYC) in BE and EAC cells, following acidic bile salts treatment. ChIP assays indicated that acidic bile salts treatment enhances binding of STAT3 to the promoter of its target genes, Survivin and BCL-xL. Inhibition of APE1/REF-1 redox activity using E3330 abrogated STAT3 DNA binding and transcriptional activity. The induction of APE1–STAT3 axis in acidic bile salts conditions provided a survival advantage and promoted cellular proliferation. In summary, our study provides multiple pieces of evidence supporting a critical role for APE1 induction in activating the EGFR–STAT3 signaling axis in response to acidic bile salts, the main risk factor for Barrett’s carcinogenesis.

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Acknowledgements

This study was supported by grants from the U.S. National Institutes of Health (R01CA206563) and the U.S. Department of Veterans affairs (1IK6BX003787 and I01BX001179). The content of this work is solely the responsibility of the authors and do not necessarily represent the official views of the Department of Veterans Affairs, National Institutes of Health, or the University of Miami.

Author contributions

AB: design of in vitro and in vivo experiments and acquisition of data; analysis and interpretation of data; drafting of the manuscript; technical and material support. HL and MS: assisted in in vitro experiments and interpretation of data. AZ: experimental troubleshooting; interpretation of data; critical revision of the manuscript. PR and AC: critical revision of the manuscript. WER: study concept and design; obtained funding; study supervision; experimental troubleshooting; interpretation of data; critical revision of the manuscript for important intellectual content.

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  1. Department of Surgery, Miller School of Medicine, University of Miami, Miami, FL, USA

    Ajaz A. Bhat, Heng Lu, Mohammed Soutto, Anthony Capobianco, Alexander Zaika & Wael El-Rifai

  2. Division of Translational Medicine, Research Branch, Sidra Medicine, Doha, Qatar

    Ajaz A. Bhat

  3. Department of Medicine, Division of Medical Oncology, Miller School of Medicine, University of Miami, Miami, FL, USA

    Priyamvada Rai

  4. Department of Veterans Affairs, Miami Healthcare System, Miami, FL, USA

    Alexander Zaika & Wael El-Rifai

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Bhat, A.A., Lu, H., Soutto, M. et al. Exposure of Barrett’s and esophageal adenocarcinoma cells to bile acids activates EGFR–STAT3 signaling axis via induction of APE1. Oncogene 37, 6011–6024 (2018). https://doi.org/10.1038/s41388-018-0388-8

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