Competition of Nuclear Factor-erythroid 2 Factors Related Transcription Factor Isoforms, Nrf1 and Nrf2, in Antioxidant Enzyme Induction

Overview

Journal Redox Biol

Specialties Biology
Cell Biology
Endocrinology

Date 2013 Sep 12

PMID 24024152

Citations 18

Authors

Nikolai L Chepelev

Hongqiao Zhang

Honglei Liu

Skye McBride

Andrew J Seal

Todd E Morgan

Caleb E Finch

William G Willmore

Kelvin J A Davies

Henry Jay Forman

Affiliations

Soon will be listed here.

Abstract

Although the Nrf2 (nuclear factor-erythroid 2 p45 subunit-related factor 2) regulated expression of multiple antioxidant and cytoprotective genes through the electrophile responsive element (EpRE) is well established, interaction of Nrf2/EpRE with Nrf1, a closely-related transcription factor, is less well understood. Due to either proteolysis or alternative translation, Nrf1 has been found as proteins of varying size, p120, p95, and p65, which have been described as either activators of EpRE or competitive inhibitors of Nrf2. We investigated the effect of Nrf1 on EpRE-regulated gene expression using the catalytic and modifier subunits of glutamate cysteine ligase (GCLC and GCLM) as models and explored the potential role of Nrf1 in altering their expression in aging and upon chronic exposure to airborne nano-sized particulate matter (nPM). Nrf1 knockout resulted in the increased expression of GCLC and GCLM in human bronchial epithelial (HBE1) cells. Overexpression Nrf2 in combination with either p120 or p65 diminished or failed to further increase the GCLC- and GLCM-EpRE luciferase activity. All known forms of Nrf1 protein, remained unchanged in the lungs of mice with age or in response to nPM. Our study shows that Nrf1 could inhibit EpRE activity in vitro, whereas the precise role of Nrf1 in vivo requires further investigations. We conclude that Nrf1 may not be directly responsible for the loss of Nrf2-dependent inducibility of antioxidant and cytoprotective genes observed in aged animals.

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