In Vivo Clearance of Human Protein S in a Mouse Model: Influence of C4b-Binding Protein and the Heerlen Polymorphism

In Vivo Clearance of Human Protein S in a Mouse Model: Influence of C4b-Binding Protein and the Heerlen Polymorphism
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小鼠模型中人蛋白 S 的体内清除:C4b 结合蛋白和 Heerlen 多态性的影响

DOI:
10.1161/01.atv.0000181760.55269.6b
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发表时间:
2005
期刊:
Arteriosclerosis, Thrombosis, and Vascular Biology
影响因子:
--
通讯作者:
P. Lenting
P. Lenting
中科院分区:
--
文献类型:
--
作者:
C. Denis;S. Roberts;T. Hackeng;P. Lenting

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目的:探讨Heerlen多态性和c4b结合蛋白(C4BP)对体内体外蛋白S分解代谢的影响。方法与结果- THP-1巨噬细胞能有效结合并降解放射性标记蛋白S,且在S载体蛋白C4BP的存在下,这两个过程均显著降低。为了测试C4BP在体内是否具有类似的保护作用,我们在小鼠身上进行了生存实验。在没有C4BP的情况下,放射性标记的人蛋白S以双相方式消失(平均停留时间[MRT] 2小时)。然而,C4BP的存在导致蛋白S存活时间延长4倍(MRT为8小时,P<0.0001)。我们还将该实验模型应用于重组蛋白S-Heerlen,这是一种含有Ser460Pro取代的自然变异。这些清除实验表明,重组蛋白S-S460P的存活时间明显降低(MRT为0.6小时,P=0.021),与S-S460P相比,C4BP的MRT为1.4小时,P=0.012。结论:S- s460p蛋白在体内的存活率较低,这可能解释了携带该多态性的个体中游离S蛋白水平较低的原因。此外,C4BP防止蛋白质S的过早清除,并利用这种能力来补偿蛋白质S- s460p的增加清除。
Objective—To explore the effect of the Heerlen polymorphism and C4b-binding protein (C4BP) on protein S catabolism in vitro and in vivo. Methods and Results—Radiolabeled protein S was efficiently bound and intracellularly degraded by THP-1 macrophages, and both processes were strongly reduced in the presence of the protein S-carrier protein C4BP. To test whether C4BP displays a similar protective effect in vivo, survival experiments were performed in mice. In the absence of C4BP, radiolabeled human protein S disappeared in a biphasic manner (mean residence time [MRT] 2 hours). However, the presence of C4BP resulted in a 4-fold prolonged survival of protein S (MRT 8 hours; P<0.0001). We also applied this experimental model to recombinant protein S-Heerlen, a naturally occurring variant that contains a Ser460Pro substitution. These clearance experiments revealed a strongly decreased survival of recombinant protein S-S460P (MRT 0.6 hours; P=0.021), which could be compensated partially by C4BP (MRT 1.4 hours; P=0.012 compared with protein S-S460P). Conclusion—Protein S-S460P has a reduced survival in vivo, which may explain the low levels of free protein S in individuals carrying this polymorphism. Furthermore, C4BP prevents premature clearance of protein S and uses this ability to compensate the increased clearance of protein S-S460P.
DOI: 10.1016/s0021-9258(19)68566-2
发表时间: 1981-11
期刊: The Journal of biological chemistry
影响因子: --
作者:
F. Walker
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DOI: 10.1172/jci111632
发表时间: 1984-01-01
影响因子: 15.9
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DOI: --
发表时间: 1999
期刊: Thrombosis and haemostasis.
影响因子: --
作者:
van'tVeer,C;Butenas,S;Golden,NJ;Mann,KG
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DOI: --
发表时间: 1993
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: Griffin,JH
DOI: 10.1073/pnas.95.16.9524
发表时间: 1998-08-04
影响因子: 11.1
作者:
Denis, C;Methia, N;Wagner, DD
通讯作者: Wagner, DD