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Nrf2 deficiency exacerbates ochratoxin A-induced toxicity in vitro and in vivo.

Abstract：

:Several mechanisms are postulated to be responsible for nephrotoxic and nephrocarcinogenic activities of mycotoxin and food contaminant, ochratoxin A (OTA). Although Nrf2 transcription factor was suggested to be involved in OTA-mediated renal injury, comprehensive study evaluating the effect of OTA toxicity in Nrf2 knock-out mice with special regard to sex-dependency has not been performed yet. Our results clearly show exacerbated OTA toxicity in porcine tubular epithelial cells after shRNA-mediated Nrf2 inhibition as well as in proximal tubular cells isolated from Nrf2-/- male mice in comparison to cells derived from their wild-type counterparts. In vivo study revealed that male mice are significantly more susceptible to OTA-mediated injury than females and this effect was further enhanced in mice lacking Nrf2. OTA increased the expression of pro-fibrotic, pro-inflammatory and pro-apoptotic factors, while concomitantly decreased the level of claudin-2 and vascular endothelial growth factor (VEGF). Importantly, miR-21, miR-34a and miR-382 were potently up-regulated after OTA delivery. Noteworthy, treatment with sulforaphane (SFN), diminished expression of OTA-induced inflammatory cytokines (IL-1β, IL-6), pro-apoptotic factors (c-myc, PUMA) and microRNAs (miR-382, miR-34a) in male mice. In summary, our data implies sex-dependent effect of OTA, with males being more sensitive. The lack of Nrf2 enhances susceptibility to mycotoxin-induced pathologies, suggesting that modulation of the Nrf2 pathway may provide a therapeutic approach to treat OTA-triggered renal diseases.

journal_name

Toxicology

journal_title

Toxicology

authors

Loboda A,Stachurska A,Sobczak M,Podkalicka P,Mucha O,Jozkowicz A,Dulak J

doi

10.1016/j.tox.2017.07.004

subject

Has Abstract

pub_date

2017-08-15 00:00:00

pages

42-52

eissn

0300-483X

issn

1879-3185

pii

S0300-483X(17)30184-1

journal_volume

389

pub_type

杂志文章

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