骨髓单个核细胞Coombs试验阳性的血细胞减少患者补体水平变化及其意义

目的 了解骨髓单个核细胞Coombs试验阳性血细胞减少(CBCPC)患者补体水平的变化,探讨补体在CBCPC患者骨髓造血细胞破坏机制中的作用.方法 对124例CBCPC患者采用ELISA法测定其骨髓上清中的补体膜攻击复合物(C5b-9)、总补体溶血活性(CH50)以及补体C3、C4水平,并采用流式细胞术(FCM)检测CBCPC患者骨髓单个核细胞膜自身抗体结合率,测定23名正常人的骨髓液补体水平;并同时测定其中30例CBCPC患者和7名正常人的外估j血血清补体水平.结果 CBCPC初治组骨髓C5b-9水平[(119.8±54.0)μg/L]高于恢复组[(100.7±33.4)μg/L]和正常对照组[(93.9 ±28.8)μg/L](P<0.05);初治组、恢复组骨髓CH50水平[(33.3±11.5)kU/L,(30.8±10.3)kU/L]高于正常对照组[(24.1±6.4)kU/L](P<0.05);初治组、恢复组骨髓C3水平[(4.9±2.2)mg/L、(5.0±3.5)mg/L]低于正常对照组[(7.0±5.6)mg/L](P<0.05);外周血血清补体水平检测结果与骨髓检测结果一致.CBCPC患者骨髓CH50与C3水平呈负相关(r=-0.303,P=0.007);CH50与C5b-9水平呈止相关(r=0.241,P=0.003).骨髓细胞膜IgM阳性的CBCPC组C5b-9水平[(117.6±55.7)μg/L]高于IgM阴性组[(99.2 ±26.2)μg/L](P<0.05),骨髓CD34+细胞膜IgG结合率、CD34+细胞膜IgM结合昔罨与C5b-9呈正相关(r=0.593,P=0.000;r=0.326,P=0.049),CH50水平与网织红细胞呈正相关(r=0.421,P=0.000),与间接胆红素亦呈正相关(r=0.230,P=0.032).结论 CBCPC患者外周血细胞减少与骨髓单个核细胞自身抗体激活补体破坏造血细胞有关.

Variation in complement level and its significance in cytopenia patients with positive BMMNC-Coombs test

Objective To investigate the variation of bone marrow complement level in cytopenia pa-tients with positive BMMNC-Coombs test(CBCPC), and probe the role of complement in destroying hemato-poietic cells of CBCPC patients. Methods One hundred and twenty-four patients with CBCPC and twenty-three healthy donors as controls were enrolled in this study. The levels of CI-150, C3, C4, C5b-9 were tested with ELISA. The auto-antibodies on bone marrow hematupoietic cells (BMHC) were examined with flow cy-tometry. Results The level of C5b-9 in bone marrow(BM) of untreated CBCPC patients [(119.8 ± 54.0)μg,/L] was significantly higher than that of recovered patients [(100.7 ± 33.4) μg/L] or normal controls [(93.9 ± 28.8) μg/I.] (P < 0.05). The levels of CH50 in BM of untreated or recovered CBCPC patients [(33.3 ± 11.5) kU/L, (30.8 ± 10.3) kU/L] were significantly higher than that of normal controls [(24.1 ±6.4) kU/L] (P < 0.05). The level of C3 in BM of untreated or recovered CBCPC patients [(4.9 ± 2.2) mg/ L], (5.0 ± 3.5) mg/L] was significantly lower than that of normal controls [(7.0 ± 5.6) mg/L] (P < 0.05). The level of complement in peripheral blood was consistent with that in BM. CH50 in BM of CBCPC patients was negatively correlated with their C3 (r = - 0. 303, P = 0. 007) and positively correlated with their C5b-9(r = 0. 241, P = 0. 003) levels. The level of C5h-9 in BM of CBCPC patients was higher in the BMHC-IgM positive group [(117.6 ± 55.7) μg/L] than in the BMHC- IgM negative group [(99.2 ± 26.2)μg/L] (P < 0. 05). The positive rate of CD34+ -IgG or CD34 + -IgM of CBCPC patients was positively corre-lated with their C5 b-9 level (r = 0. 593, P = 0.000, r = 0. 326, P = 0. 049). The reticulocyte percentage (r =0. 421, P = 0.000) and serum indirect bilirubin level (r = 0. 230, P = 0. 032) of CBCPC patients were posi-tively correlated with their CHSO level. Conclusions The hematocytopenia of CBCPC patients might be re-lated to the hematopoietic cells destruction caused by auto-antibedy activated complements.