Rutin maintains redox balance to relieve oxidative stress induced by TBHP in nucleus pulposus cells.

Rutin is well known for its anti-inflammatory and antioxidant properties against oxidative stress. However, its protective function in nucleus pulposus cells (NPCs) remains unclear. This study was aimed to explore the effects of rutin on oxidative stress in NPCs. Primary NPCs were obtained from 1-mo-old SD rats. The NPCs were treated with tert-butyl hydrogen peroxide (TBHP) to obtain the oxidative stress, and different concentrations of rutin were used to observe its influence on the oxidative stress in NPCs. Fluorescent probe DCFH-DA was used to detect reactive oxide species (ROS). The antioxidant proteins and genes of heat shock protein 70 (HSP70), manganese superoxide dismutase (Mn-SOD), catalase, aggrecan and collagen II in NPCs were measured by western blot and real-time PCR. With the stimulation of TBHP, the content of ROS in NPCs increased significantly and showed solubility correlation. Rutin effectively reduced the accumulation of ROS in a dose-dependent manner. The antioxidant proteins of HSP70, Mn-SOD, and catalase and the matrix proteins of aggrecan and collagen II decreased remarkably with the stimulation of TBHP, while the matrix metalloproteinase-13 (MMP-13) significantly increased after TBHP intervention. Rutin boosted the expressions of the HSP70, Mn-SOD, and catalase, elevated the contents of aggrecan and collagen II, and inhibited the expression of MMP-13 in NPCs. The findings of this study suggested that rutin is able to reverse oxidative stress and maintain cellular function of NPCs, and it was indicated that rutin could be a possible therapeutic option for intervertebral disc degeneration.