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- Title
Intermedin attenuates renal fibrosis by induction of heme oxygenase-1 in rats with unilateral ureteral obstruction.
- Authors
Xi Qiao; Lihua Wang; Yanhong Wang; Xiaole Su; Yufeng Qiao; Yun Fan; Zhiqiang Peng; Qiao, Xi; Wang, Lihua; Wang, Yanhong; Su, Xiaole; Qiao, Yufeng; Fan, Yun; Peng, Zhiqiang
- Abstract
<bold>Background: </bold>Intermedin [IMD, adrenomedullin-2 (ADM-2)] attenuates renal fibrosis by inhibition of oxidative stress. However, the precise mechanisms remain unknown. Heme oxygenase-1 (HO-1), an antioxidant agent, is associated with antifibrogenic effects. ADM is known to induce HO-1. Whether IMD has any effect on HO-1 is unclear. Herein, we determined whether the antifibrotic properties of IMD are mediated by induction of HO-1.<bold>Methods: </bold>Renal fibrosis was induced by unilateral ureteral obstruction (UUO) performed on male Wistar rats. Rat proximal tubular epithelial cell line (NRK-52E) was exposed to rhTGF-β1 (10 ng/ml) to establish an in vitro model of epithelial-mesenchymal transition (EMT). IMD was over-expressed in vivo and in vitro using the vector pcDNA3.1-IMD. Zinc protoporphyrin (ZnPP) was used to block HO-1 enzymatic activity. IMD effects on HO-1 expression in the obstructed kidney of UUO rat and in TGF-β1-stimulated NRK-52E were analyzed by real-time RT-PCR, Western blotting or immunohistochemistry. HO activity in the obstructed kidney, contralateral kidney of UUO rat and NRK-52E was examined by measuring bilirubin production. Renal fibrosis was determined by Masson trichrome staining and collagen I expression. Macrophage infiltration and IL-6 expression were evaluated using immunohistochemical analysis. In vivo and in vitro EMT was assessed by measuring α-smooth muscle actin (α-SMA) and E-cadherin expression using Western blotting or immunofluorescence, respectively.<bold>Results: </bold>HO-1 expression and HO activity were increased in IMD-treated UUO kidneys or NRK-52E. The obstructed kidneys of UUO rats demonstrated significant interstitial fibrosis on day 7 after operation. In contrast, kidneys that were treated with IMD gene transfer exhibited minimal interstitial fibrosis. The obstructed kidneys of UUO rats also had greater macrophage infiltration and IL-6 expression. IMD restrained infiltration of macrophages and expression of IL-6 in UUO kidneys. The degree of EMT was extensive in obstructed kidneys of UUO rats as indicated by decreased expression of E-cadherin and increased expression of α-SMA. In vitro studies using NRK-52E confirmed these observations. EMT was suppressed by IMD gene delivery. However, all of the above beneficial effects of IMD were eliminated by ZnPP, an inhibitor of HO enzyme activity.<bold>Conclusion: </bold>This study demonstrates that IMD attenuates renal fibrosis by induction of HO-1.
- Subjects
MSH (Hormone); RENAL fibrosis; HEME oxygenase; MYOCARDIAL depressants; FIBROSIS; KIDNEY diseases; GENE therapy; GENETICS; THERAPEUTICS; KIDNEY disease prevention; ANIMAL experimentation; ANIMALS; CELL culture; GENES; GENETIC techniques; NEUROPEPTIDES; OXIDOREDUCTASES; PEPTIDE hormones; RATS; URETERIC obstruction
- Publication
BMC Nephrology, 2017, Vol 18, p1
- ISSN
1471-2369
- Publication type
journal article
- DOI
10.1186/s12882-017-0659-6