Activated protein C (APC) is an anticoagulant serine protease derived from the two chain, vitamin K-dependent zymogen, protein C (3-7). A complex between alpha-thrombin and thrombomodulin catalyzes a single cleavage at Arg-12 (Arg-14 in bovine) in the heavy chain of protein C, to generate activated Protein C. Several non-physiologically relevant proteases such as RVV-X activator, trypsin, and PROTAC are also capable of activating protein C.
APC functions as an anticoagulant which catalyzes the proteolytic inactivation of the cofactors, factors Va and VIIIa, leading to inhibition of the prothrombinase and factor Xase complexes. The inactivation of factors Va and VIIIa is both Ca2+ and phospholipid dependent. The vitamin K dependent cofactor, protein S, moderately increases this rate of inactivation by forming a 1:1 complex with APC (Kd=6x10-9M) (8).
Several factors attenuate the anticoagulant activity of APC. Factor Xa protects factor Va from proteolysis by APC by competing for a similar binding site on factor Va. Thrombin has also been proposed as a regulator of APC by proteolytic inactivation of protein S. In addition, APC is regulated by a circulating heparin-dependent protein C inhibitor (PAI-3), a circulating heparin-independent protein C inhibitor, a platelet-derived protein C inhibitor, and PAI-1. The complexes formed between APC and both types of PAI have been reported to account for increased fibrinolysis observed upon infusion of APC or the generation of APC in vivo.
In addition to our standard APC preparation, an active site-blocked form containing Dansyl-EGR-chloromethlyketone is also available.
Activated protein C is prepared from purified protein C by activation with thrombin followed by ion exchange chromatography (4). APC is supplied in 50% (vol/vol) glycerol/H2O and should be stored at -20oC. Purity is determined by SDS-PAGE analysis and activity is measured using a chromogenic substrate assay. All production lots of APC are also tested for their ability to prolong the aPTT of normal human plasma, as required for the APC resistance assay (10,11). The results of this test are provided for each lot, as an aPTT (+/- APC) ratio (10nM APC).
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HSV1型导致的一般都是腰部以上的感染，典型症状是水泡有可能引起脑炎，而且有非活化状态的潜伏。所以我觉得你根本就不用担心这个抗体IgG阳性的化验单。
您好，对于优生学检查，有两种抗体，一种是IGG抗体，一种是IGM抗体，如果是前者阳性，只能说明即往以前有感染了这类病原体，而不能说明当前正在感染这个病毒的。
指导意见：
如果是后一种阳性，也就是说IGM抗体阳性时，就提示当前正在感染这个病毒的，需要及时行抗病毒的药物治疗为佳，治好后才行怀孕的，否则对于怀孕的胎儿有很大的影响的。
aware可自测不用抽血祝您健康天 猫！
2-IgM也是一种特异性感染指标，但在人体内持续时间不长（有时是30天更短），往往是传染病的近期感染指标。呈阴性是指：你近期没有感染过结核杆菌。
风疹病毒抗体IgM阳性才需要治疗。
