Production of three plasminogen activators and an inhibitor in keratinocyte cultures.

Production of three plasminogen activators and an inhibitor in keratinocyte cultures.
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在角质形成细胞培养物中产生三种纤溶酶原激活剂和一种抑制剂。

DOI:
10.1016/0304-4165(83)90339-2
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发表时间:
1983
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Taylor,RE
Taylor,RE
中科院分区:
--
文献类型:
--
作者:
Birkedal-Hansen,H;Taylor,RE

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研究了角质形成细胞在细胞外蛋白水解中的作用。在支持上皮集落持续扩增但限制成纤维细胞增殖的条件下(30-32 ℃和pH 6.8-7.0),维持和连续繁殖源自大鼠舌腹侧上皮的角化细胞。这些文化,和文化的建立,终末分化的角质形成细胞系,也来自腹侧上皮的大鼠舌,释放大量的纤溶酶原激活剂活性,如可视化的纤维蛋白-琼脂覆盖技术。此外,角质形成细胞直接生长在3 H-标记的纤维蛋白裂解此基板在纤溶酶辅助的过程。血清的存在下调制的反应的动力学的方式,这表明,一个恒定的抑制剂张力用于包含在组织中的蛋白水解反应,并防止连锁反应。角质形成细胞分泌蛋白和细胞裂解物的电泳分辨率显示三个不同的活化剂迁移的分子量为48 000,66 000和95 000。角质形成细胞还产生主要针对活化步骤的纤维蛋白溶解反应的抑制剂。在无血清培养收获培养基中存在抑制活性,其量足以完全消灭内源性激活剂。
Keratinocyte function in extracellular proteolysis was investigated. Keratinocytes derived from rat tongue ventral epithelium were maintained and serially propagated under conditions which support continuous expansion of epithelial colonies but are restrictive to fibroblast proliferation (30–32°C and pH 6.8–7.0). These cultures, and cultures of an established, terminally differentiating keratinocyte line, also derived from the ventral epithelium of the rat tongue, released substantial plasminogen activator activity as visualized by the fibrin-agar overlay technique. In addition, keratinocytes grown directly on3H-labeled fibrin lysed this substrate in a plasmin-assisted process. The presence of serum modulated the kinetics of the reaction in a manner which suggests that a constant inhibitor tonus serves to contain the proteolytic reaction in the tissues and to prevent a chain reaction. Electrophoretic resolution of keratinocyte secretory proteins and of cell lysates revealed three distinct activators migrating at molecular weights of 48 000, 66 000 and 95 000. The keratinocytes also manufactured inhibitor(s) of the fibrinolytic reaction mainly directed against the activation step. The inhibitory activity was present in serum-free culture harvest media in quantities sufficient to completely annihilate the endogenous activators.
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