Urokinase-type plasminogen activator up-regulates the expression of its cellular receptor

被引:22
|
作者
Montuori, N
Salzano, S
Rossi, G
Ragno, P
机构
[1] CNR, CEOS, I-80131 Naples, Italy
[2] Univ Naples Federico II, Dipartimento Biol & Patol Cellulare & Mol, I-80131 Naples, Italy
关键词
urokinase; urokinase receptor; plasminogen activation;
D O I
10.1016/S0014-5793(00)01713-0
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The expression of the receptor for the urokinase-type plasminogen activator (uPAR) can be regulated by several hormones, cytokines, tumor promoters, etc. Recently, it has been reported that uPAR is capable of transducing signals, el en though it is lacking a transmembrane domain and a cytoplasmatic tail. We now report that uPAR cell surface expression can be positively regulated by its ligand, uPA, in thyroid cells. The effect of uPA is independent of its proteolytic activity, since inactivated uPA or its aminoterminal fragment hare the same effects of the active enzyme. The increase of uPAR on the cell surface correlates with an increase of specific uPAR mRNA. Finally, uPA up-regulates uPAR expression also in other cell lines of different type and origin, thus suggesting that the regulatory role of uPA on uPAR expression is not restricted to thyroid cells, but it occurs in different tissues, both normal and tumoral. (C) 2000 Federation of European Biochemical Societies. Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码:166 / 170
页数:5
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