Chronic renal injury (CRI) is a common pathological damage in
chronic renal disease, and the therapeutic options for preventing its progression are limited at present.
Ginsenoside Rg1 (Rg1) is reported to have a protective effect on renal injury by improving oxidative stress and
inflammation.
Lipopolysaccharide (LPS) plays important roles in inducing inflammatory and high-dose LPS is often used to perform
acute renal injury. However, little is known about the effect of low-dose LPS on CRI, and the protective effect of Rg1 against chronic LPS-induced CRI. Here, we reported the protective effect and mechanism of Rg1 against LPS-induced CRI in mice. In this study, the results demonstrated that low-dose LPS (0.25 mg/kg) exposure for 14 days significantly induced renal function impairment and renal injury and
fibrosis. Meanwhile, LPS exposure significantly increased
reactive oxygen species (ROS) generation,
NADPH oxidase 4 (NOX4) and NLRP3
inflammasome expression in renal cortex. However, treatment with Rg1,
tempol (a
superoxide dismutase mimetic), and
apocynin (a NOX inhibitor) significantly improved renal function impairment and renal
fibrosis, and significantly decreased the levels of TGF-β, IL-1β, KIM-1, β-Gal, and
collagen IV in the kidneys. And Rg1 treatment also significantly reduced ROS generation and inhibited the activation of NOX4 and NLRP3
inflammasome. Overall, these results suggest that Rg1 treatment can ameliorate LPS-induced chronic kidney injury and renal
fibrosis, the mechanisms may be involved in reducing NOX2-mediated oxidative stress and inhibiting NLRP1
inflammasome.