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Increasing amounts of evidence demonstrated that accumulative reactive oxygen species (ROS) and apoptosis of human endometrial stromal cells (ESCs) are closely associated with endometrial dysfunction induced by oxidative stress,which plays an important role in the pathological process of multiple gynecological and reproduction-related diseases.SCM-198,an alkaloid active component of Leonurus japonicas Houtt,has been reported to have anti-oxidative activity.However,the specific mechanisms of SCM-198 in the prevention of endometrial damage remain unknown.In the present study,we assessed the effect of SCM-198 on hydrogen peroxide (H2O2)-induced oxidative injury in ESCs.ESCs were pretreated with SCM-198 for 4 h and then challenged with H2O2.Morphology changes,apoptosis rate,and intracellular ROS production were measured to assess the level of oxidative injury.Flow cytometry and weste blot analysis were performed to detect the expression levels of Bax,Bcl-2,active-caspase-3,and mitogen-activated protein kinases pathways.Classic inflammation cytokines were measured by real-time polymerase chain reactions.Our results showed that SCM-198 attenuated apoptosis and ROS generation of ESCs induced by H2O2.H2O2 induced the apparent apoptotic characteristics,including fragmentation of DNA,upregulation of Bax/Bcl2,activation of caspase-3,and secretion of inflammation cytokines,which were all ameliorated by SCM-198.Furthermore,H2O2-induced apoptosis-related ERK1/2 pathway activation was restrained by SCM-198 pretreatment.These findings suggested that SCM-198 could protect ESCs from oxidative injury,mainly by inhibiting oxidative stress and reducing apoptosis.