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Deprecated: Implicit conversion from float 278.79999999999995 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Cell+Stress+Chaperones 2016 ; 21 (2): 239-49 Nephropedia Template TP
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Salidroside protects against bleomycin-induced pulmonary fibrosis: activation of Nrf2-antioxidant signaling, and inhibition of NF-?B and TGF-?1/Smad-2/-3 pathways #MMPMID26577463
Tang H; Gao L; Mao J; He H; Liu J; Cai X; Lin H; Wu T
Cell Stress Chaperones 2016[Mar]; 21 (2): 239-49 PMID26577463show ga
Pulmonary fibrosis (PF) can severely disrupt lung function, leading to fatal consequences. Salidroside is a principal active ingredient of Rhodiola rosea and has recently been reported to protect against lung injures. The present study was aimed at exploring its therapeutic effects on PF. Lung fibrotic injuries were induced in SD rats by a single intratracheal instillation of 5 mg/kg bleomycin (BLM). Then, these rats were administrated with 50, 100, or 200 mg/kg salidroside for 28 days. BLM-triggered structure distortion, collagen overproduction, excessive inflammatory infiltration, and pro-inflammatory cytokine release, and oxidative stress damages in lung tissues were attenuated by salidroside in a dose-dependent manner. Furthermore, salidroside was noted to inhibit I?B? phosphorylation and nuclear factor kappa B (NF-?B) p65 nuclear accumulation while activating Nrf2-antioxidant signaling in BLM-treated lungs. Downregulation of E-cadherin and upregulation of vimentin, fibronectin, and ?-smooth muscle actin (?-SMA) indicated an epithelial-mesenchymal transition (EMT)-like shift in BLM-treated lungs. These changes were suppressed by salidroside. The expression of TGF-?1 and the phosphorylation of its downstream targets, Smad-2/-3, were enhanced by BLM, but weakened by salidroside. Additionally, salidroside was capable of reversing the recombinant TGF-?1-induced EMT-like changes in alveolar epithelial cells in vitro. Our study reveals that salidroside?s protective effects against fibrotic lung injuries are correlated to its anti-inflammatory, antioxidative, and antifibrotic properties.