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NRF2 antioxidant response protects against acidic bile salts-induced oxidative stress and DNA damage in esophageal cells.

Abstract：

:Gastroesophageal reflux disease (GERD) is the main risk factor for Barrett's tumorigenesis. In this study, we investigated the role of NRF2 in response to exposure to acidic bile salts (ABS), in conditions that mimic GERD, using Barrett's esophagus cell models. We detected an increase in NRF2 protein levels, following exposure to ABS. We found oxidization of cysteines (cysteines with oxidized thiol groups) in KEAP1 protein with a weaker interaction between NRF2 and KEAP1, following ABS exposure. Treatment with bile salts increased nuclear NRF2 levels, enhancing its transcription activity, as measured by an ARE (antioxidant response element) luciferase reporter assay. The mRNA expression levels of NRF2 target genes, HO-1 and GR, were increased in response to ABS exposure. Using genetic overexpression and knockdown of NRF2, we found that NRF2 has a critical role in suppressing ABS-induced ROS levels, oxidative DNA damage, DNA double strand breaks, and apoptosis. Collectively, our results suggest that transient induction of NRF2 in response to ABS plays a pivotal role in protecting esophageal cells by maintaining the levels of oxidative stress and DNA damage below lethal levels under GERD conditions.

journal_name

Cancer Lett

journal_title

Cancer letters

authors

Peng D,Lu H,Zhu S,Zhou Z,Hu T,Chen Z,Zaika A,El-Rifai W

doi

10.1016/j.canlet.2019.05.031

subject

Has Abstract

pub_date

2019-08-28 00:00:00

pages

46-55

eissn

0304-3835

issn

1872-7980

pii

S0304-3835(19)30326-X

journal_volume

458

pub_type

杂志文章

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