Regulation of MUC5AC Expression by NAD(P)H:quinone Oxidoreductase 1

Overview

Journal Free Radic Biol Med

Specialties Biochemistry
Biology
General Medicine

Date 2007 Mar 31

PMID 17395013

Citations 18

Authors

Shuo Zheng

Angela S Byrd

Bernard M Fischer

Amy R Grover

Andrew J Ghio

Judith A Voynow

Affiliations

Soon will be listed here.

Abstract

Neutrophil elastase (NE), a potent neutrophil inflammatory mediator, increases MUC5AC mucin gene expression through undefined pathways involving reactive oxygen species. To determine the source of NE-generated reactive oxygen species, we used pharmacologic inhibitors of oxidoreductases to test whether they blocked NE-regulated MUC5AC mRNA expression. We found that dicumarol, an inhibitor of the NADP(H):quinone oxidoreductase 1 (NQO1), inhibited MUC5AC mRNA expression in A549 lung adenocarcinoma cells and primary normal human bronchial epithelial cells. We further tested the role of NQO1 in mediating NE-induced MUC5AC expression by inhibiting NQO1 expression using short interfering RNA (siRNA). Transfection with siRNA specific for NQO1 suppressed NQO1 expression and significantly abrogated MUC5AC mRNA expression. NE treatment caused lipid peroxidation in A549 cells; this effect was inhibited by pretreatment with dicumarol, suggesting that NQO1 also regulates oxidant stress in A549 cells after NE exposure. NE exposure increased NQO1 protein and activity levels; NQO1 expression and activity were limited to the cytosol and did not translocate to the plasma membrane. Our results indicate that NQO1 has an important role as a key mediator of NE-regulated oxidant stress and MUC5AC mucin gene expression.

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