[Correlations of Melatonin and Glutathione Levels with Oxidative Stress Mechanism in Parkinson's Disease].

Objective To investigate the changes of serum melatonin(MLT)and glutathione(GSH)levels in patients with Parkinson's disease(PD)and explore their relationships with disease severity,cognitive dysfunction,and sleep disorders. Methods Totally 50 PD patients treated in our center from September 2017 to February 2018 were enrolled as the PD group,and 50 healthy controls matched with age and sex as the control group.The improved Hoehn and Yahr scale was used to assess the severity of PD.The Montreal Cognitive Assessment Scale was used to assess the cognitive function and Pittsburgh's Sleep Quality Index was used to detect the patient's sleep.The serum levels of MLT and GSH were detected by enzyme-linked immunosorbent assay and the results were compared. Results Serum MLT level in the PD group was significantly higher than that in the control group [(84.12±6.58)pg/ml vs.(46.29±9.73)pg/ml,P=0.000],and serum GSH level was significantly lower than that in the control group [(21.07±12.05)μmol/L vs.(77.73±39.90)μmol/L,P=0.000].There was a positive correlation between serum MLT level and H-Y grade(r=0.537,P=0.000),and there was a negative correlation between serum GSH level and H-Y grade(r=-0.596,P=0.000).Serum MLT was negatively correlated with GSH level in PD patients(r=-0.842,P=0.000).The MLT level in PD patients with sleep disorders was significantly higher than in those without sleep disorders [(85.79±6.45)pg/ml vs.(78.84±3.54)pg/ml,P=0.001];the level of GSH in PD patients with cognitive dysfunction was significant lower than in the non-cognitive dysfunction group [(17.47±10.67)μmol/L vs.(26.09±12.23)μmol/L,P=0.011]. Conclusions Serum MLT level increases and GSH level decreases in PD patients.Both MLT and GSH are correlated with PD severity,and there is a negative correlation between MLT and GSH.In addition,PD patients with sleep disorders have higher MLT level and those with cognitive impairment tend to have lower GSH level.