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Tyrosine phosphorylation of human urokinase-type plasminogen activator.

Abstract：

:Immunoblotting analysis of purified human urokinase plasminogen activator (u-PA), gives a positive signal when reacted with anti-phosphotyrosine monoclonal antibodies (MoAb anti-P-Tyr); competition with o-phospho-DL-tyrosine (P-Tyr) but not o-phospho-DL-threonine or serine (P-Treo, P-Ser) completely suppresses this signal. Either the 55 kDa u-PA form and the lower Mw form (33 kDa) derived from the 55 kDa u-PA are Tyr-phosphorylated also the u-PA secreted in the culture media of human fibrosarcoma cells (HT-1080) is phosphorylated in tyrosine as well as u-PA present in tissue extracts of tumors induced in nude mice by HT-1080 cells. These data show that urine purified human u-PA and u-PA produced by human fibrosarcoma cells, in vitro and in vivo, are phosphorylated in tyrosine; furthermore our data show that u-PA is the major Tyr-phosphorylated protein present in these human tumor cells.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Barlati S,Paracini F,Bellotti D,De Petro G

doi

10.1016/0014-5793(91)80377-f

subject

Has Abstract

pub_date

1991-04-09 00:00:00

pages

137-40

issue

1-2

eissn

0014-5793

issn

1873-3468

journal_volume

281

pub_type

杂志文章

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