人血浆谷氨酸型纤溶酶原的检测及其临床意义

Detection of Glu-plasminogen in the human plasma and its clinical significance

目的 :探讨机体凝血和纤溶系统激活时 ,血浆中Glu -Plg(Pln)含量变化和其临床意义。方法 :利用自备的特异性针对Glu -Plg(Pln)抗原表位结构 (NH2 末端 1- 6 5aa)的单克隆抗体和针对Plg (Pln)重链区抗原表位的单克隆抗体 ,分别构建人血浆Glu -Plg(Pln)和Plg(Pln)二种双抗体夹心ELISA检测方法。应用 2种检测试剂分别对2 2 0例健康者、4 0例心外科手术后患者的血浆样品进行检测。结果 :实验结果表明 :2 2 0例健康者的Plg(Pln)含量为( 2 31 8± 6 2 1)mg/L ;Glu -Plg含量为 ( 2 13 9± 4 5 8)mg/L ;G/P比值为X =0 91。而 4 0例心外科手术后患者血浆中Glu -Plg(Pln)含量 ( 15 2 4± 6 8 1)mg/L与Plg(Pln)含量 ( 2 6 8 9± 73 3)mg/L比值显著为低 (P <0 0 1) ,其中 38例G/P比值也下降到X =0 5 4。结论 :血浆Glu -Plg(Pln)含量变化可能与血浆中Pln增加正反馈地促进Lys-Plg生成有关 ,增加的Lys -Plg能加速纤维蛋白水解。本实验建立的人血浆Glu -Plg(Pln)和Plg(Pln)

AIM: To observe the changes of plasma content of Glu-plasminogen (plasmin, Pln) in patients during blood coagulation and/or fibrinolytic system activation. METHODS: Using specific McAb to antigenic determinant in NH 2 terminal (1-65 aa) of Pln and specific McAb to antigenic determinant in heavy chain of plasminogen, the sandwiched ELISA method was established to detect Glu-plasminogen and total plasminogen in human plasma collected from 220 normal controls and 40 patients after heart surgery. RESULTS: The average total plasminogen was (231.8±62.1) mg/L and average Glu-plasminogen was (231.9±45.8) mg/L in 220 normal controls, the ratio of Glu-plasminogen to total plasminogen (G/P) was 0.91. The ratio of Glu-plasminogen [(152.4±68.1) mg/L] to total plasminogen [(268.9±73.3) mg/L] in 40 patients after heart surgery was significantly lower than that in normal controls ( P <0.01). CONCLUSION: The sandwiched ELISA method we established to detect Glu-plasminogen and total plasminogen in human plasma has comparatively better specificity and sensitivity for clinical use.