凝血酶-抗凝血酶复合物检测方法建立及初步应用
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引
言
凝血酶一抗凝血酶复合物(thrombin—antithrombin complex,TAT)是 人体内凝血和抗凝血相互作用以维持生理平衡的产物,是凝血酶 (thrombin,T)生成和凝血系统激活的标志物之一。
肝素(heparin,H)催化TAT的形成,首先肝素结合抗凝血酶 (antithrombin,AT),形成肝素一AT二联体(H—T),使AT抗凝活性基团暴
一 经过抗体配对试验,用针对TAT的凝血酶部位的Ⅺ号单抗作捕获抗
体,用针对TAT之抗凝血酶部位的Ⅲ号抗体作酶标检测抗体,建立了检测
TAT的双抗体夹心法酶联免疫吸附试验。该法的线性检测范围为
0.4—63.O!LLg/L,批内cV为3.9%一5.9%,批间cV为9.1%一13.3%,回收率为
92.6%一104.9%。加入20“gml的AT和凝血酶原对TAT检测无影响。检测
modification of thrombin’S and antithrombin’S structures will emerge.SO TAT
should have neoantigen different from thrombin and antithrolI虹in.Base 0n
those cases,and in order to obtain mere monoclonal antibodies specific to TAT the sNile time reduce cross-actions with thrombin or antithrombin,we
situations.
Behring laboratory in Germany coated microtitration plates with rabbit antibodies against human thrombin,conjugated horseradish peroxidase to
supposed that immning mice with TAT would be more reasonable than that
with thrombin and antithrombin individually.
Thrembin and antithrombin were mixed together in ratio after been
、
附试验临床应用。
酶联免疫吸
Development and鼬dimental Application of an Fnz,me-linked Immosorbent
Assay to Determine the Tlm妯irr-antitbrunbin Complex in Plasma
Abstract
fibromyama,myocardial infarction,liver diseases,acute leukemia ∞d
pregnancy.Testing TAT was significant to monitor the hi曲coagulation state in pregnancy,acute myocardial infarction and hepatitides.
上海第二医科大学 硕士学位论文
凝血酶-抗凝血酶复合物检测方法建立及初步应用 姓名:陈红兵
申请学位级别:硕士 专业:临床检验诊断学(免疫学测定)
指导教师:罗伟 2002.5.1
凝血酶一抗凝血酶复合物检测方法的建立及其初步临床应用
中文摘要
凝血酶一抗凝血酶复合物(thrombin—antithrombin complex,TAT)是 体内凝血酶原激活成凝血酶(thrombin,Z)后,迅速被抗凝血酶 (antithrombin,AT)结合,生成共价键相连的无活性不可逆复合物TAT,由 此维持凝血一抗凝血之间的生理平衡,目前认为该复合物的形成是凝血酶 生成的直接证据,标志凝血系统的激活。检测TAT的血浆水平可以监测凝 血系统的激活情况,是研究生理病理状态下凝血系统行为的一项有用指
标。一
一、{TAT在形成过程中,凝血酶裂解抗凝血酶的Ar9393-Ser394位肽键,
并以凝血酶丝氨酸活性中心Ser205结合抗凝血酶的Ar9393位,两者构象
均发生一定的改变,呈现出一定的新抗原表位。因此,用TAT免疫小鼠来
制备单克隆抗体可以得到针对T
高和特异性好的单克隆抗体,同
时减少与TAT前体分子的交叉反
the third as detection antibody(with antithrombin cross-reaction).The
linear rang of the assay vras from 0.4 u g/L to 63.0 u g/L.The intra-assay
and intez--assay variation coefficients were 3.弘5.9j6 and 9.1% ̄13.396 respectively.nle T』盯recovery rates were 92.6%to 104.弧Addition of
露。在血浆游离凝血酶生成后此H~T二联复合体立即与之结合,形成AT— T—H三联复合体,凝血酶酶解AT并与之形成共价键,凝血酶失活,两者构 象均有一定程度改变[1引。此后肝素脱离,稳定TAT形成。
国外研究表明,检测TAT对前DIC(pre—DIC)有高的敏感性和特异性 IT],可据TAT值对DIC(disseminated intravascular congulation,弥散 性血管内凝血)进行诊断和分级[8]。检测TAT可预测DVT(deep vein thrombosis,深静脉血栓)形成[9],可作DVT疗效指标“0|。检测TAT可对 AMI(acute myocardial infarct ion,急性心肌梗死)进行早期诊断、预测 再闭塞、考察溶栓疗效n1¨],可区分良性和恶性肿瘤、监视妇科癌症的转 移‘-5·川。可作为肝病严重程度和死亡预测指标[18、1引。TAT也在妊娠、感 染、类风湿病等升高[20≈4|。
溶酶复合物)、DD(D-dimer,D一二聚体)、FDP(fibrin(fibrinogen)
degradation products,纤维蛋白(原)降产物]显著相关。肝病、消化道 恶性肿瘤、急性白血病患者TAT也显著升高。TAT在预测心肌梗死、监视
妊娠、肝炎等高凝状态具有很大意义。
以上结果表明,该法可用于检测血浆TAT。为评估生理、病理状态下
利用肝素一Sepharose CL一6B
柱从人血浆中提取凝血酶和抗凝
血酶,然后两者按一定比例体外反应,即可得到浓度和纯度均较高的TAT
复合物(同时含有少量AT和多余的凝血酶)。以该反应的混合物免疫小
鼠,我们制备了一系列特异和非特异针对TAT的单克隆抗体,并得到了特
望. 对AT和特异针对凝血酶的单抗。
between the coagulation and anti-coagulation systen_L 1he complex is a direct indicator of in vivo thrombin generation.It is a good molecular marker to
purified from human fresh platelet absent plasma by affinity chromatography
on heparin-sepharose CL-6B,through this approach we prepared弋吼
blend(mainly TAT and alSO any residual anththrombin and thro曲in).Inmming
mice with this blend,we prepared a pool of monoclonal antibodies specific or unspecific to TAT,antithrombin and thrombin.
After antibodies sifting test。we established a sandwich ELISA employing the eleventh antibody(with thrembin cross-reaction)as capture antibody and
As soon as activated thrombinogen transforms to thrombin in
blood,antithrombin rapidly binds to thrombin by a covalent bond to form
inactive thrombin-antithrombin complex,in order to maintain the balance
detecting 50 normal and clinical specimens with variant concentrations of
掰?:
that,c唧ared Results obtained from different group of patients showed
to normal cortrols.higher 1虹concentration were observed in patients with
In view of these reults,we considered that the developed method was
useful in TAT determination.It was also a useful tool for studying the
activated state of coagulation system in曲ysiological and pathological
20Ug/ml AT or thrombinogen to the plasma did not interference the detection
of鼢lT.The correlation of results from the developed ELISA and the
comnercial TAT kit(DADE inc.America)was well㈣.969,KO.0001)according to
rabbit antibodies against hmmn antithrombin,successfully developed a
D1姗in sandwich甩ISA to出temine TAT in
19魄0ur method showed that
the era in china with no capability to detect TAT was over,SO was the era
in the world with no kit for TAT enDloying monoclonal antibodies.
Key words:Thrombin—antithrombin complex, Chromatography Monoclonal antibody,Enzyme—linked immunosorbent assay
的凝血系统行为提供了一个有用的工具。
1988年德国behring实验室建立了TAT检测方法,他们应用兔抗人凝
血酶的多抗作捕获抗体,用兔抗人的抗凝血酶的多抗作检测抗体。与之比
较,该法则采用亲和力和特异性均较强的单抗建立TAT检测方法,填补了
国内TAT检测能力的空白和国际上该方法学上的空白。
/ 。
关键词:凝血酶禽抗凝血酶复合物层折 单克隆抗体
50例含高、中、低值的血浆标本,与用美国DADE公司的试剂盒检测的结
果比较,两者相关系数为0.969,具有非常显著的意义(P<O.0001)。、丫 /
f
初步临床应用表明,健康年轻女性较健康年轻男性TAT显著增高,孕
妇及子宫肌瘤患者TAT显著升高。心肌梗死患者尤其是陈旧性心肌梗死患
者TAT上升显著,且与PAP(plasmin—antiplasmin complex,纤溶酶一抗纤
formation,蚴5 monitor the coagulation system in Imthological situations.
In TAT
of thrombin bonds to Ar9393 of antithrcmbin at
the same time that cleavage of a part of the antithrombin peptide and