可溶性IL-2受体及NK细胞活性在噬血细胞性淋巴组织细胞增多症中的意义

本研究通过检测噬血细胞性淋巴组织细胞增多症(HLH)患者外周血中可溶性IL-2受体(sCD25)及NK细胞活性,探讨它们在HLH中的意义。应用酶联免疫吸附法检测20例HLH患者、15例正常对照者、20例急性髓系白血病(AML)患者及20例系统性红斑狼疮(SLE)患者外周血血清sCD25水平;用流式细胞术CD107a标记法及传统的LDH释放法检测HLH组及正常对照组外周血NK细胞活性。结果显示:HLH组血清sCD25水平较正常对照组、AML组及SLE组均明显升高(P<0.001);HLH组NK细胞活性明显低于正常对照组(P<0.05);将流式细胞术CD107a标记法与传统的LDH释放法检测NK细胞活性进行相关分析,该两种检测方法之间具有显著相关性(r=0.73,P<0.05)。结论:血清sCD25及外周血NK细胞活性检测是HLH重要的辅助诊断指标,流式细胞术CD107a标记法检测NK细胞活性简单、稳定、重复性高,有助于HLH的临床诊断。

Significance of soluble interleukin-2 receptor and NK cell activity in patients with hemophagocytic lymphohistiocytosis

This study was aimed to detect the level of soluble interleukin-2 receptor (sCD25) and cytotoxic activity of NK lymphocytes in patients with hemophagocytic lymphohistiocytosis (HLH), and to explore their clinical significance in HLH. The enzyme-linked immunosorbent assay was used to detect the sCD25 level in serum of 20 patients with HLH, 15 healthy controls, 20 cases of acute myeloid leukemia and 20 cases of systemic lupus erythematosus. The NK cell cytotoxicity in peripheral blood of patients with HLH and controls were detected by flow cytometry with CD107a antibody labeling and LDH release assay. The results indicated that the level of sCD25 in HLH patients was significantly higher than that in healthy controls and disease groups (P < 0.001). The NK cell cytotoxicity in peripheral blood detected by both methods in patients with HLH were lower than that in healthy controls (P < 0.05), and the results detected by flow cytometry correlated significantly with those by LDH release assay (r = 0.73, P < 0.05). It is concluded that detection of sCD25 levels and NK cell activity in peripheral blood in HLH is of great value. Using flow cytometry following CD107a antibody labeling to measure NK activity is a simple, stability, reproducibility method and can be used for clinical diagnosis of HLH.