Journal
MOLECULAR NUTRITION & FOOD RESEARCH
Volume 57, Issue 3, Pages 504-515Publisher
WILEY
DOI: 10.1002/mnfr.201200456
Keywords
Fibrosis; HO-1; miR-132; miR-200c; Ochratoxin A
Categories
Funding
- Polish Ministry for Science and Higher Education [IP2011 031071]
- National Science Center [N N401 297835, N N301 033440]
- Foundation for Polish Science-Parent-Bridge Programme
- European Union within European Regional Development Fund
- Wellcome Trust Senior Research Fellowship in Basic Biomedical Science
- DFG cluster of excellence Inflammation at Interfaces
- European Union
- Polish Ministry of Science and Higher Education [POIG.02.01.00-12-064/0802.02.00-00-014/08, 01.01.02-00-069/09, 01.01.02-00-109/09]
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Scope Ochratoxin A (OTA) is a mycotoxin exhibiting nephrotoxic and potential carcinogenic activity. We investigated the cross-talk between microRNAs, nuclear factor E2-related factor 2 (Nrf2), and heme oxygenase-1 (HO-1) in ochratoxin A-mediated effects. Methods and results In porcine renal proximal tubular cells, OTA increased expression of profibrotic transforming growth factors (TGF) while concomitantly decreasing expression of Nrf2, HO-1, and erythropoietin. Adenoviral overexpression of Nrf2 counteracted OTA-mediated reduction in HO-1 and erythropoietin expression and cell proliferation as well as increase in reactive oxygen species (ROS) generation and TGF expression. Additionally, inhibition of HO activity enhanced whereas adenoviral overexpression of HO-1 reduced expression of TGF. Moreover, antioxidants, N-acetyl-cysteine and desferioxamine, prevented OTA-mediated enhancement of ROS generation, and TGF expression. Finally, OTA modulated microRNA processing by upregulating LINeage protein 28 and DiGeorge syndrome critical region-8, increasing the total pool of cellular microRNAs and elevating the expression of miR-132 and miR-200c. Inhibition of miR-132 by specific antagomir restored the OTA-driven reduction in Nrf2 expression. Moreover, anti-miR-132 and anti-miR-200c counteracted OTA-mediated decrease in HO-1 levels as well as increase in ROS production and TGF expression. Conclusion We showed that attenuation of Nrf2 and HO-1 expression through induction of miR-132 and miR-200c by OTA elevates ROS levels and profibrotic TGF expression.
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