Binding of tissue plasminogen activator to cultured human endothelial cells.

Binding of tissue plasminogen activator to cultured human endothelial cells.
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组织纤溶酶原激活剂与培养的人内皮细胞的结合。

DOI:
10.1172/jci113262
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发表时间:
1987
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Nachman,RL
Nachman,RL
中科院分区:
--
文献类型:
--
作者:
Hajjar,KA;Hamel,NM;Harpel,PC;Nachman,RL

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组织纤溶酶原激活剂(t-PA)和尿激酶(u-PA)是纤溶酶原的主要激活剂,由内皮细胞合成和释放。我们先前证明了纤溶酶原与培养的人脐静脉内皮细胞(HUVEC)的特异性和功能性结合。本研究发现t-PA可与HUVEC结合。t-PA与HUVEC的结合是特异性的、可饱和的、不依赖于纤溶酶原的,并且不需要赖氨酸结合位点。t-PA以快速和可逆的方式结合,涉及高亲和力(Kd,28.7 +/- 10.8 pM; Bmax,3,700 +/- 300)和低亲和力(Kd,18.1 +/- 3.8 nM; Bmax 815,000 +/-146,000)的结合位点。t-PA结合被100倍摩尔过量的u-PA抑制70%。当t-PA被绑定到HUVEC,其表观催化效率增加了三到四倍,测定纤溶酶原激活。HUVEC结合t-PA的活性位点受到其快速作用抑制剂纤溶酶原激活物抑制剂的保护。这些结果表明,t-PA与HUVEC特异性结合,并且这种结合保留了纤溶酶原激活的催化效率。因此,内皮细胞可以通过提供用于激活纤溶酶原的特异性结合位点来调节细胞表面的止血和血栓形成事件。
Tissue plasminogen activator (t-PA) and urokinase (u-PA), the major activators of plasminogen, are synthesized and released from endothelial cells. We previously demonstrated specific and functional binding of plasminogen to cultured human umbilical vein endothelial cells (HUVEC). In the present study we found that t-PA could bind to HUVEC. Binding of t-PA to HUVEC was specific, saturable, plasminogen-independent, and did not require lysine binding sites. The t-PA bound in a rapid and reversible manner, involving binding sites of both high (Kd, 28.7 +/- 10.8 pM; Bmax, 3,700 +/- 300) and low (Kd, 18.1 +/- 3.8 nM; Bmax 815,000 +/- 146,000) affinity. t-PA binding was 70% inhibited by a 100-fold molar excess of u-PA. When t-PA was bound to HUVEC, its apparent catalytic efficiency increased by three- or fourfold as measured by plasminogen activation. HUVEC-bound t-PA was active site-protected from its rapidly acting inhibitor: plasminogen activator inhibitor. These results demonstrate that t-PA specifically binds to HUVEC and that such binding preserves catalytic efficiency with respect to plasminogen activation. Therefore, endothelial cells can modulate hemostatic and thrombotic events at the cell surface by providing specific binding sites for activation of plasminogen.
凝血酶与血小板的平衡结合。
DOI: 10.1021/bi00667a021
发表时间: 1976
期刊: Biochemistry
影响因子: 2.9
作者:
B. M. Martin;W. W. Wasiewski;J. Fenton;T. Detwiler
通讯作者: T. Detwiler
DOI: 10.1016/s0021-9258(17)42691-3
发表时间: 1984-12
期刊: The Journal of biological chemistry
影响因子: --
作者:
J. V. van Mourik;D. Lawrence;D. Loskutoff
通讯作者: J. V. van Mourik;D. Lawrence;D. Loskutoff
顶体素抑制剂对公羊顶体素可溶性和膜结合形式的影响,以及该酶在受精中作用的重新评估。
DOI: --
发表时间: 1976
期刊: Hoppe-Seyler´s Zeitschrift für physiologische Chemie
影响因子: --
作者:
C. Brown;E. Hartree
通讯作者: E. Hartree
尿激酶与牛角膜内皮细胞结合。
DOI: 10.1016/s0014-4835(85)80028-2
发表时间: 1985
影响因子: 3.4
作者:
Shuman,MA;Merkel3rd,CH
通讯作者: Merkel3rd,CH
纤溶酶原与培养的人内皮细胞的结合。
DOI: --
发表时间: 1986
期刊: The Journal of biological chemistry
影响因子: --
作者:
Hajjar,KA;Harpel,PC;Jaffe,EA;Nachman,RL
通讯作者: Nachman,RL