Coordinated induction of Nrf2 target genes protects against iron nitrilotriacetate (FeNTA)-induced nephrotoxicity.

Abstract:

:The iron chelate, ferric nitrilotriacetate (FeNTA), induces acute proximal tubular necrosis as a consequence of lipid peroxidation and oxidative tissue damage. Chronic exposure of FeNTA leads to a high incidence of renal adenocarcinomas in rodents. NF-E2-related factor 2 (Nrf2) is a transcription factor that is activated by oxidative stress and electrophiles, and regulates the basal and inducible expression of numerous detoxifying and antioxidant genes. To determine the roles of Nrf2 in regulating renal gene expression and protecting against oxidative stress-induced kidney damage, wild-type and Nrf2-null mice were administered FeNTA. Renal Nrf2 protein translocated to the nucleus at 6h after FeNTA treatment. FeNTA increased mRNA levels of Nrf2 target genes, including NQO1, GCLC, GSTpi1/2, Mrp1, 2, and 4 in kidneys from wild-type mice, but not Nrf2-null mice. Protein expression of NQO1, a prototypical Nrf2 target gene, was increased in wild-type mice, with no change in Nrf2-null mice. FeNTA produced more nephrotoxicity in Nrf2-null mice than wild-type mice as indicated by higher serum urea nitrogen and creatinine levels, as more urinary NAG, stronger 4-hydroxynonenal protein adduct staining, and more extensive proximal tubule damage. Furthermore, pretreatment with CDDO-Im, a potent small molecule Nrf2 activator, protected mice against FeNTA-induced renal toxicity. Collectively, these results suggest that activation of Nrf2 protects mouse kidneys from FeNTA-induced oxidative stress damage by coordinately up-regulating the expression of cytoprotective genes.

journal_name

Toxicol Appl Pharmacol

authors

Tanaka Y,Aleksunes LM,Goedken MJ,Chen C,Reisman SA,Manautou JE,Klaassen CD

doi

10.1016/j.taap.2008.05.022

subject

Has Abstract

pub_date

2008-09-15 00:00:00

pages

364-73

issue

3

eissn

0041-008X

issn

1096-0333

pii

S0041-008X(08)00227-5

journal_volume

231

pub_type

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