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| Correlation of Serum YKL-40, Hcy, UA, and BDNF Levels with Cognitive Function in Patients with Parkinson's Disease |
| GAO Yuan, TIAN Feng |
| Department of Neurology, The First Affiliated Hospital of Shihezi University, Shihezi Xinjiang 832000 |
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Abstract 【Objective】 To investigate the relationship of serum levels of human cartilage glycoprotein 39 (YKL-40), homocysteine (Hcy), uric acid (UA), and brain-derived neurotrophic factor (BDNF) with cognitive function in patients with Parkinson's disease (PD).【Methods】 A total of 113 PD patients were enrolled. According to the presence or absence of cognitive impairment, they were divided into a cognitive impairment group (Group A, n=62) and a non-cognitive impairment group (Group B, n=51). Patients in Group A were further classified into a mild group (n=34), a moderate group (n=18), and a severe group (n=10) based on the severity of cognitive impairment. The serum levels of YKL-40, Hcy, UA, and BDNF were compared between Groups A and B and analyzed among sub-groups of patients with different degrees of cognitive impairment as well. The predictive value for cognitive impairment was analyzed, and the correlations between these serum indicators and the degree of cognitive impairment were further examined. 【Results】Serum YKL-40 and Hcy levels in Group A were significantly higher than those in Group B, whereas serum UA and BDNF levels were significantly lower than those in Group B (P<0.05). Receiver operating characteristic curve analysis showed that the optimal cutoff values YKL-40,Hcy,UA,BDNF for predicting cognitive impairment were 4.015 mg/mL, 24.930 μmol/L, 296.235 μmol/L, and 11.195 ng/mL (all P<0.05). In the severe subgroup, serum YKL-40 and Hcy levels were higher and UA and BDNF levels were lower than those in both mild and moderate subgroups (P<0.05). In the moderate subgroup, serum YKL-40 and Hcy levels were higher and UA and BDNF levels were lower than those in the mild subgroup (P<0.05). Correlation analysis showed that serum YKL-40 and Hcy levels were positively correlated with the degree of cognitive impairment (P<0.05), whereas serum UA and BDNF levels were negatively correlated with the degree of cognitive impairment (P<0.05). 【Conclusion】 PD patients with cognitive impairment exhibit notably elevated serum YKL-40 and Hcy levels as well as decreased serum UA and BDNF levels, all of which are closely related to the severity of cognitive impairment.
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Received: 14 September 2023
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2025, Vol. 42 
