Objective To investigate the relationship between serum Th1/Th2 cytokine expres-sion levels and the degree of bone destruction in patients with skeletal tuberculosis.Methods A to-tal of 75 patients with skeletal tuberculosis admitted from August 2022 to August 2024 were enrolled as the study subjects.Based on varied degree of bone destruction assessed by imaging,the patients were divided into mild bone destruction group(n=51)and severe bone destruction group(n=24).Clinical data of the two groups were compared.Fasting venous blood samples were collected from the patients in the early morning.The levels of Th1 cytokines[tumor necrosis factor-α(TNF-α),interferon-γ(IFN-γ),interleukin-2(IL-2)]and Th2 cytokines[transforming growth factor-β(TGF-β),inter-leukin-4(IL-4),interleukin-10(IL-10)]in the serum were measured using the enzyme-linkedim-munosorbent assay(ELISA).Meanwhile,imaging data such as plain X-rays and magnetic reso-nance imaging(MRI)were collected to assess the degree of bone destruction.Spearman correlation analysis was used to evaluate the correlation between serum Th1/Th2 cytokine expression and the degree of bone destruction.Multivariate Logistic regression analysis was conducted to identify the in-fluencing factors of the degree of bone destruction in patients with skeletal tuberculosis.The receiver operating characteristic(ROC)curve was employed to analyze the diagnostic efficacy of serum Th1/Th2 cytokines for the degree of bone destruction in patients with skeletal tuberculosis.Results There were no significant differences in age,gender,body mass index(BMI),and the proportions of patients with a history of hypertension,diabetes mellitus,or hyperlipidemia between the two groups(P＞0.05).Compared with the mild bone destruction group,the severe bone de-struction group showed significantly elevated serum levels of Th1 cytokines(TNF-α,IFN-γ,IL-2)and significantly decreased serum levels of Th2 cytokines(TGF-β,IL-10)(P＜0.05).Spearman correlation analysis revealed that serum TNF-α(r=0.363,P=0.001),IFN-γ(r=0.383,P＜0.001),and IL-2(r=0.347,P=0.002)levels were positively correlated with the degree of bone destruction,while serum TGF-β(r=-0.380,P＜0.001)and IL-10(r=-0.365,P=0.001)levels were negatively correlated with the degree of bone destruction.Logistic regression analysis in-dicated that TNF-α,IFN-γ,TGF-β,and IL-10 were independent influencing factors for the degree of bone destruction in patients with skeletal tuberculosis(P＜0.05).ROC curve analysis demon-strated that the areas under the curve(AUCs)for TNF-α,IFN-γ,TGF-β,and IL-10 in predicting the degree of bone destruction in patients with skeletal tuberculosis were 0.725,0.737,0.735,and 0.726,respectively.The corresponding sensitivities were 62.50％,75.00％,62.50％,and 83.33％,and the specificities were 84.31％,62.75％,86.27％,and 62.75％,respectively.The combined AUC of these indicators was 0.887,which was superior to that of individual predic-tions.Conclusion In patients with skeletal tuberculosis,as the degree of bone destruction increa-ses,the serum levels of TNF-α,IFN-γ,and IL-2 rise,the serum levels of TGF-β and IL-10 gradu-ally decrease.TNF-α,IFN-γ,TGF-β,and IL-10 are independent influencing factors for the degree of bone destruction.Moreover,the combined application of Th1/Th2 cytokines has a certain predic-tive value for the degree of bone destruction.

Based on microfabrication technology and electrochemical modification method, a micro electrochemical sensor for nitrate ( NO-3 ) determination was developed. A micro sensor chip with working electrode and counter electrode was used as the signal convertor of the sensor. The area of the micro working_electrode was only 1 mm2 . As an electrocatalysis sensitive material, copper was electrodeposited onto the working electrode by square_wave pulse current electrodeposition method. The morphologies and components of freshly deposited materials were examined by scanning electron microscopy ( SEM ) and X_ray diffraction ( XRD) to explore key factors that affected the electrocatalytic ability of the deposited copper layer for reducing nitrate ions. The experimental results revealed that under the optimal conditions, the deposited copper layer was macroporous and had a larger effective surface area that could serve as a more effective electrocatalyst in facilitating nitrate reduction. Electrochemical response of the macroporous copper layer was characterized by linear sweep voltammetry in acidic supporting electrolytes ( pH=2 ) . The electroanalytical results showed that the modified microsensor had marked sensitivity for standard nitrate samples within the concentration range from 12. 5 to 3000 μmol/L (in the range of 12. 5-200 μmol/L yielded straight line:y1=-0. 1422x-10. 326, R12=0. 9976, while in the range of 200-3000 μmol/L yielded straight line: y2=-0. 0984x-22. 144, R22=0. 9927) with a detection limit of 2 μmol/L (S/N=3). The developed electrochemical microsensor was also employed for nitrate determination in water samples collected from lakes and rivers near the city of Beijing. The results were in good agreement with the data given by qualified water quality detection institute, with the deviations from 3 . 9% to 15 . 4%.