title: Peroxiredoxin 5 Protects TGF-β Induced Fibrosis by Inhibiting Stat3 Activation in Rat Kidney Interstitial Fibroblast Cells.
abstract: Renal fibrosis is a common final pathway of end-stage kidney disease which is induced by aberrant accumulation of myofibroblasts. This process is triggered by reactive oxygen species (ROS) and proinflammatory cytokines generated by various source of injured kidney cells. Peroxiredoxin 5 (Prdx5) is a thiol-dependent peroxidase that reduces oxidative stress by catalyzing intramolecular disulfide bonds. Along with its antioxidant effects, expression level of Prdx5 also was involved in inflammatory regulation by immune stimuli. However, the physiological effects and the underlying mechanisms of Prdx5 in renal fibrosis have not been fully characterized. Sprague-Dawley rats were subjected to unilateral ureteral obstruction (UUO) for 1 or 7 days. For the in vitro model, NRK49F cells, a rat kidney interstitial fibroblast cell lines, were treated with transforming growth factor β (TGF-β) for 0, 1, 3, or 5 days. To access the involvement of its peroxidase activity in TGF-β induced renal fibrosis, wild type Prdx5 (WT) and double mutant Prdx5 (DM), converted two active site cysteines at Cys 48 and Cys 152 residue to serine, were transiently expressed in NRK49F cells. The protein expression of Prdx5 was reduced in UUO kidneys. Upregulation of fibrotic markers, such as fibronectin and alpha-smooth muscle actin (α-SMA), declined at 5 days in time point of higher Prdx5 expression in TGF-β treated NRK49F cells. The overexpression of wild type Prdx5 by transient transfection in NRK49F cells attenuated the TGF-β induced upregulation of fibronectin and α-SMA. On the other hand, the transient transfection of double mutant Prdx5 did not prevent the activation of fibrotic markers. Overexpression of Prdx5 also suppressed the TGF-β induced upregulation of Stat3 phosphorylation, while phosphorylation of Smad 2/3 was unchanged. In conclusion, Prdx5 protects TGF-β induced fibrosis in NRK49F cells by modulating Stat3 activation in a peroxidase activity dependent manner.
authors.affiliation: Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea.
authors.forename: Hoon-In
authors.initials: HI
authors.lastname: Choi
authors.affiliation: Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea.
authors.forename: Seong Kwon
authors.initials: SK
authors.lastname: Ma
authors.affiliation: Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea.
authors.forename: Eun Hui
authors.initials: EH
authors.lastname: Bae
authors.affiliation: Department of Physiology, Chonnam National University Medical School, Gwangju, Republic of Korea.
authors.forename: JongUn
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea.
authors.forename: Soo Wan
authors.initials: SW
authors.lastname: Kim
mesh_terms: D000818:Animals; D002460:Cell Line; D005347:Fibroblasts / Q000378:metabolism / Q000473:pathology*; D005355:Fibrosis; D007668:Kidney / Q000378:metabolism / Q000473:pathology*; D008297:Male; D054464:Peroxiredoxins / Q000378:metabolism*; D017207:Rats, Sprague-Dawley; D017382:Reactive Oxygen Species / Q000378:metabolism; D050796:STAT3 Transcription Factor / Q000378:metabolism*; D016212:Transforming Growth Factor beta / Q000378:metabolism*
chemical_list: D017382:Reactive Oxygen Species; D050796:STAT3 Transcription Factor; D016212:Transforming Growth Factor beta; D054464:Peroxiredoxins