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Chinese Journal of Lung Diseases(Electronic Edition) ›› 2024, Vol. 17 ›› Issue (06): 869-874. doi: 10.3877/cma.j.issn.1674-6902.2024.06.004

• Original articles • Previous Articles    

Association of serum S1P with disease severity and immunosuppressive therapy in connective tissueassociated interstitial lung disease

Xiao Han1, Fenglian Tang1, Youwen Zhang1, Gaochao Lv1, Bo Jiang1, Lijiang Wang1,()   

  1. 1.Department of Respiratory and Critical Care Medicine, Jining Medical College Affiliated Hospital,Jining, Shandong 272000, China
  • Received:2024-07-17 Online:2024-12-25 Published:2025-01-23
  • Contact: Lijiang Wang

Abstract:

Objective

To investigate the relationship between serum sphingosine 1-phosphate (S1P)level,disease severity and immunosuppressive therapy in patients with connective tissue disease-associated interstitial lung disease (CTD-ILD).

Methods

All of 85 cases of CTD-ILD patients admitted to the Department of Respiratory and Critical Care Medicine,Affiliated Hospital of Jining Medical College from December 2022 to January 2024 were selected as the study objects.The severity of CTD-ILD disease and the extent of lung involvement were assessed using carbon monoxide dispersion as a percentage of expected value(DLCO%) and high-resolution CT ( HRCT) scanning.All CTD-ILD patients received standard cyclophosphamide (CTX) impulse therapy and were divided into response subgroup and response subgroup according to treatment effect.Serum S1P levels in CTD-ILD patients were detected by enzyme-linked immunosorbent assay at baseline,3 months after treatment and 6 months after treatment.Spearman method was used to evaluate the relationship between serum S1P and other indicators.

Results

In the 85 cases,34 cases(40.00%) were mild CTD-ILD,38 cases (44.71%) were moderate CTD-ILD,and 13 cases (15.29%) were severe CTD-ILD.Compared with mild patients,lung function (FVC%,FEV1%,DLCO%) was significantly decreased in moderate and severe patients (F=20.206, F=33.587, F=71.133, P<0.05).The baseline serum S1P levels of CTD-ILD patients in mild,moderate and severe groups were 663.70 (249.76,1 045.27) ng/ml,877.47 (705.31,1 861.98) ng/ml and 1 624.38 (1 016.52,3 753.87) ng/ml(H=14.028, P<0.001).Spearman and multivariate linear regression analysis showed that baseline serum S1P level in CTD-ILD patients was correlated with FVC% (β=-0.009, t=-3.943, P<0.001),FEV1% (β=-0.009, t=-3.912, P<0.001),DLCO% (nonstandardized coefficient β = -0.008, t = -3.871, P <0.001) was still negatively correlated.After CTX shock therapy,all 85 CDT-ILD patients received HRCT scans and PFT at three time points,64 patients were diagnosed as effective or stable (response subgroup),and the remaining 21 patients(24.71%) were classified as ineffective subgroup.The baseline PLT/LYM ratio[129.06(88.64,184.32)vs.193.62(120.24,265.94)] and CRP level[4.99(3.30,20.07)mg/L vs. 11.90(3.69,31.07)mg/L] in the remission subgroup were slightly lower than those in the ineffective subgroup (P<0.05).Further trend analysis showed that the serum S1P level in the remission subgroup gradually decreased over time,and at 3 and 6 months after treatment,the serum S1P level[851.13(412.68,1 497.11)ng/ml vs. 962.07(438.99,1 561.03)ng/ml] in the remission subgroup was lower than that in the ineffective subgroup (P<0.05).

Conclusion

Serum S1P levels tend to decrease in patients who are in remission after CTX shock therapy,S1P may also be a supportive indicator of treatment effectiveness in CTD-ILD patients.

Key words: Connective tissue disease-associated interstitial lung disease, Serum sphingosine-1-phosphate, Severity, Immunosuppressive therapy

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