淋巴细胞亚群联合趋化因子对儿童原发免疫性血小板减少症诊断价值研究

Study on the diagnostic value of lymphocyte subpopulations combined with chemokines in children with immunologic thrombocytopenic purpura

目的探讨淋巴细胞亚群联合趋化因子对儿童原发免疫性血小板减少症(ITP)的诊断价值。方法收集拟诊为ITP的132例患儿,根据ITP相关的临床诊断标准诊断结果将患儿分为ITP组与非ITP组。抽取外周静脉血6 ml,以流式细胞仪对CD4^(+)、CD8^(+)及CD3^(+)水平进行检测,以酶联免疫吸附法检测CC类趋化因子配体5(CCL5)、CC类趋化因子配体11(CXCL11)、单核细胞趋化蛋白-1(MCP-1)水平,以全自动细胞分析仪对血小板计数(PLT)进行检测。比较2组患儿淋巴细胞亚群及趋化因子水平,并对淋巴细胞亚群及趋化因子水平与PLT进行相关性分析;采用ROC法评估各指标单独检测与联合检测对ITP的诊断效能。结果ITP组患者CD4^(+)和CD3^(+)水平低于非ITP组,CD8^(+)水平高于非ITP组(P<0.05);ITP组患者CCL5、CXCL11和MCP-1水平均高于非ITP组(P<0.05);相关性分析结果显示ITP组患者CD4^(+)和CD3^(+)与PLT呈正相关(P<0.05),CD8^(+)、CCL5、CXCL11、MCP-1与血小板计数呈负相关(P<0.05);ROC分析结果显示,CD4^(+)、CD8^(+)、CD3^(+)、CCL5、CXCL11和MCP-1对儿童ITP诊断的截断值值分别为27.13%、24.02%、59.88%、41.02 ng/L、30.18 ng/L和188.27 ng/L,AUC分别为0.893、0.880、0.629、0.801、0.892和0.751,六者并联诊断(指并联检测时CD4^(+)、CD3^(+)中的一项及以上低于截断值和/或CD8^(+)、CCL5、CXCL11和MCP-1中的一项及以上高于截断值)的AUC为0.967,其诊断效能高于各指标单独检测(P<0.05)。结论儿童ITP患者与非ITP患者淋巴细胞亚群及趋化因子均具有差异,CD4^(+)、CD8^(+)、CD3^(+)、CCL5、CXCL11和MCP-1可用于儿童ITP的诊断,各指标联合检测可提高检测效能。

Objective To explore the diagnostic value of lymphocyte subpopulations combined with chemokines in children with immunologic thrombocytopenic purpura(ITP).Methods 132 children with proposed diagnosis of ITP were collected,and the children were divided into ITP and non-ITP groups according to the diagnostic results of ITP-related clinical diagnostic criteria.6 ml of peripheral venous blood was drawn,the levels of CD4^(+)CD8^(+)and CD3^(+)were detected using flow cytometry,and the levels of chemokine(C-C motif)ligand 5(CCL5),Recombinant Chemokine(C-X-C Motif)Ligand 1(CXCL11),and monocyte chemotactic protein-1(MCP-1)were detected using enzyme-linked immunosorbent assay,the blood platelet(PLT)was measured by a fully automated cell analyzer.The children were divided into ITP and non-ITP groups according to the clinical diagnostic criteria related to ITP.The lymphocyte subpopulations and chemokine levels of the two groups of children were compared,and the correlation between lymphocyte subpopulations and chemokine levels and PLT was analyzed.The ROC method was used to evaluate the diagnostic efficacy of individual and combined detection of each indicator for ITP.Results The levels of CD4^(+)and CD3^(+)in the ITP group were lower than those in the non ITP group(P<0.05),while the levels of CD8^(+)were higher than those in the non ITP group(P<0.05).The levels of CCL5,CXCL11,and MCP-1 in the ITP group were higher than those in the non ITP group(P<0.05).The correlation analysis results showed that CD4^(+),CD3^(+)and platelet count were positively correlated in the ITP group(P<0.05),while CD8^(+),CCL5,CXCL11,MCP-1 were negatively correlated with PLT(P<0.05).The ROC analysis results showed that the cut-off values of CD4^(+),CD8^(+),CD3^(+),CCL5,CXCL11,and MCP-1 for the diagnosis of ITP in children were 27.13%,24.02%,59.88%,41.02 ng/L,30.18 ng/L,and 188.27 ng/L,respectively.The AUC values were 0.893,0.880,0.629,0.801,0.892,and 0.751,respectively,The AUC of the parallel diagnosis(meaning that one or more of CD4^(+),CD3^(+)was below the cut-off value and/or one or more of CD8^(+),CCL5,CXCL11,MCP-1 was above the cut-off value at the time of parallel testing)was 0.967,indicating that one or more of them was lower than the cut off value and/or one or more of them was higher than the cut off value when tested separately.Its diagnostic efficacy was higher than that of each indicator tested separately(P<0.05).Conclusion There are significant differences in lymphocyte subpopulations and chemokines between pediatric ITP patients and non-ITP patients.CD4^(+),CD8^(+),CD3^(+),CCL5,CXCL11,and MCP-1 can be used for the diagnosis of pediatric ITP.Combined detection of various indicators can improve detection efficiency.