Cigarette smoke regulates the competitive interactions between NRF2 and BACH1 for heme oxygenase-1 induction

Wen Hsin Chang, Philip Thai, Jihao Xu, David C. Yang, Reen Wu, Ching-Hsien Chen

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Cigarette smoke has been shown to trigger aberrant signaling pathways and pathophysiological processes; however, the regulatory mechanisms underlying smoke-induced gene expression remain to be established. Herein, we observed that two smoke-responsive genes, HO-1 and CYP1A1, are robustly induced upon smoke by different mechanisms in human bronchial epithelia. CYP1A1 is mediated by aryl hydrocarbon receptor signaling, while induction of HO-1 is regulated by oxidative stress, and suppressed by N-acetylcysteine treatment. In light of a pivotal role of NRF2 and BACH1 in response to oxidative stress and regulation of HO-1, we examined if smoke-induced HO-1 expression is modulated through the NRF2/BACH1 axis. We demonstrated that smoke causes significant nuclear translocation of NRF2, but only a slight decrease in nuclear BACH1. Knockdown of NRF2 attenuated smoke-induced HO-1 expression while down-regulation of BACH1 had stimulatory effects on both basal and smoke-induced HO-1 with trivial influence on NRF2 nuclear translocation. Chromatin immunoprecipitation assays showed that smoke augments promoter-specific DNA binding of NRF2 but suppresses BACH1 binding to the HO-1 promoter ARE sites, two of which at −1.0 kb and −2.6 kb are newly identified. These results suggest that the regulation of NRF2 activator and BACH1 repressor binding to the ARE sites are critical for smoke-mediated HO-1 induction.

Original languageEnglish (US)
Article number2386
JournalInternational Journal of Molecular Sciences
Volume18
Issue number11
DOIs
StatePublished - Nov 10 2017

Fingerprint

Heme Oxygenase-1
smoke
Smoke
Tobacco Products
induction
interactions
Cytochrome P-450 CYP1A1
Oxidative stress
Oxidative Stress
Acetylcysteine
Oxygenases
Aryl Hydrocarbon Receptors
chromatin
epithelium
Chromatin Immunoprecipitation
gene expression
Gene expression
genes
Chromatin
Assays

Keywords

  • Airway epithelium
  • Gene regulation
  • HO-1
  • NRF2
  • Smoke

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

Cite this

Cigarette smoke regulates the competitive interactions between NRF2 and BACH1 for heme oxygenase-1 induction. / Chang, Wen Hsin; Thai, Philip; Xu, Jihao; Yang, David C.; Wu, Reen; Chen, Ching-Hsien.

In: International Journal of Molecular Sciences, Vol. 18, No. 11, 2386, 10.11.2017.

Research output: Contribution to journalArticle

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abstract = "Cigarette smoke has been shown to trigger aberrant signaling pathways and pathophysiological processes; however, the regulatory mechanisms underlying smoke-induced gene expression remain to be established. Herein, we observed that two smoke-responsive genes, HO-1 and CYP1A1, are robustly induced upon smoke by different mechanisms in human bronchial epithelia. CYP1A1 is mediated by aryl hydrocarbon receptor signaling, while induction of HO-1 is regulated by oxidative stress, and suppressed by N-acetylcysteine treatment. In light of a pivotal role of NRF2 and BACH1 in response to oxidative stress and regulation of HO-1, we examined if smoke-induced HO-1 expression is modulated through the NRF2/BACH1 axis. We demonstrated that smoke causes significant nuclear translocation of NRF2, but only a slight decrease in nuclear BACH1. Knockdown of NRF2 attenuated smoke-induced HO-1 expression while down-regulation of BACH1 had stimulatory effects on both basal and smoke-induced HO-1 with trivial influence on NRF2 nuclear translocation. Chromatin immunoprecipitation assays showed that smoke augments promoter-specific DNA binding of NRF2 but suppresses BACH1 binding to the HO-1 promoter ARE sites, two of which at −1.0 kb and −2.6 kb are newly identified. These results suggest that the regulation of NRF2 activator and BACH1 repressor binding to the ARE sites are critical for smoke-mediated HO-1 induction.",
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