Abstract:
:Activation of plasminogen, the zymogen of the primary thrombolytic enzyme, plasmin, is markedly promoted when plasminogen is bound to cell surfaces, arming cells with the broad spectrum proteolytic activity of plasmin. In addition to its role in thrombolysis, cell surface plasmin facilitates a wide array of physiologic and pathologic processes. Carboxypeptidase B-sensitive plasminogen binding sites promote plasminogen activation on eukaryotic cells. However, no integral membrane plasminogen receptors exposing carboxyl terminal basic residues on cell surfaces have been identified. Here we use the exquisite sensitivity of multidimensional protein identification technology and an inducible progenitor cell line to identify a novel differentiation-induced integral membrane plasminogen receptor that exposes a C-terminal lysine on the cell surface, Plg-R(KT) (C9orf46 homolog). Plg-R(KT) was highly colocalized on the cell surface with the urokinase receptor, uPAR. Our data suggest that Plg-R(KT) also interacts directly with tissue plasminogen activator. Furthermore, Plg-R(KT) markedly promoted cell surface plasminogen activation. Database searching revealed that Plg-R(KT) mRNA is broadly expressed by migratory cell types, including leukocytes, and breast cancer, leukemic, and neuronal cells. This structurally unique plasminogen receptor represents a novel control point for regulating cell surface proteolysis.
journal_name
Bloodjournal_title
Bloodauthors
Andronicos NM,Chen EI,Baik N,Bai H,Parmer CM,Kiosses WB,Kamps MP,Yates JR 3rd,Parmer RJ,Miles LAdoi
10.1182/blood-2008-11-188938subject
Has Abstractpub_date
2010-02-18 00:00:00pages
1319-30issue
7eissn
0006-4971issn
1528-0020pii
blood-2008-11-188938journal_volume
115pub_type
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