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http://dx.doi.org/10.1016/j.jgr.2020.08.005

Saponins from Panax japonicus ameliorate age-related renal fibrosis by inhibition of inflammation mediated by NF-κB and TGF-β1/Smad signaling and suppression of oxidative stress via activation of Nrf2-ARE signaling  

Gao, Yan (College of Medical Science, China Three Gorges University)
Yuan, Ding (College of Medical Science, China Three Gorges University)
Gai, Liyue (College of Medical Science, China Three Gorges University)
Wu, Xuelian (College of Medical Science, China Three Gorges University)
Shi, Yue (College of Medical Science, China Three Gorges University)
He, Yumin (College of Medical Science, China Three Gorges University)
Liu, Chaoqi (College of Medical Science, China Three Gorges University)
Zhang, Changcheng (College of Medical Science, China Three Gorges University)
Zhou, Gang (College of Traditional Chinese Medicine, China Three Gorges University)
Yuan, Chengfu (College of Medical Science, China Three Gorges University)
Publication Information
Journal of Ginseng Research / v.45, no.3, 2021 , pp. 408-419 More about this Journal
Abstract
Background: The decreased renal function is known to be associated with biological aging, of which the main pathological features are chronic inflammation and renal interstitial fibrosis. In previous studies, we reported that total saponins from Panax japonicus (SPJs) can availably protect acute myocardial ischemia. We proposed that SPJs might have similar protective effects for aging-associated renal interstitial fibrosis. Thus, in the present study, we evaluated the overall effect of SPJs on renal fibrosis. Methods: Sprague-Dawley (SD) aging rats were given SPJs by gavage beginning from 18 months old, at 10 mg/kg/d and 60 mg/kg/d, up to 24 months old. After the experiment, changes in morphology, function and fibrosis of their kidneys were detected. The levels of serum uric acid (UA), β2-microglobulin (β2-MG) and cystatin C (Cys C) were assayed with ELISA kits. The levels of extracellular matrix (ECM), matrix metalloproteinases (MMPs), tissue inhibitors of metalloproteinases (TIMPs), inflammatory factors and changes of oxidative stress parameters were examined. Results: After SPJs treatment, SD rats showed significantly histopathological changes in kidneys accompanied by decreased renal fibrosis and increased renal function; As compared with those in 3-month group, the levels of serum UA, Cys C and β2-MG in 24-month group were significantly increased (p < 0.05). Compared with those in the 24-month group, the levels of serum UA, Cys C and β2-MG in the SPJ-H group were significantly decreased. While ECM was reduced and the levels of MMP-2 and MMP-9 were increased, the levels of TIMP-1, TIMP-2 and transforming growth factor-β1 (TGF-β1)/Smad signaling were decreased; the expression level of phosphorylated nuclear factor kappa-B (NF-κB) was down-regulated with reduced inflammatory factors; meanwhile, the expression of nuclear factor erythroid 2-related factor 2-antioxidant response element (Nrf2-ARE) signaling was aggrandized. Conclusion: These results suggest that SPJs treatment can improve age-associated renal fibrosis by inhibiting TGF-β1/Smad, NFκB signaling pathways and activating Nrf2-ARE signaling pathways and that SPJs can be a potentially valuable anti-renal fibrosis drug.
Keywords
Total saponins of panax japonicus; Aging; Renal fibrosis; $TGF-{\beta}1$/Smad; Nrf2-ARE signaling pathways;
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