Abstract:
:Plasminogen activation by tissue-plasminogen activator (t-PA) is accelerated by the presence of a macromolecular surface, which acts as a template that brings enzyme and substrate in close proximity. Modification of lysine residues, which are important for this template function, occurs in diabetic patients as a consequence of glycation of proteins. In this study, we investigated the effects of glycation of fibrin and other proteins in t-PA-catalyzed plasmin formation. Plasminogen activation on glycated fibrin(ogen) was increased compared to non-glycated fibrin(ogen), which could fully be attributed to an increased affinity of t-PA for glycated fibrin(ogen). Binding of plasminogen to glycated fibrin was increased, but did not contribute to increased plasminogen activation. Both plasminogen activator inhibitor-1 (PAI-1) binding and activity were increased on glycated fibrin. Induction of template function in plasminogen activation was also observed on immobilized glycated bovine serum albumin (BSA) and human gamma-globulins (IgG). Increased plasmin generation at sites of deposition of glycated proteins may lead to increased extracellular matrix breakdown and thereby affect the integrity of the endothelial monolayer. Moreover, soluble glycated BSA and glycated IgG can inhibit t-PA binding to immobilized glycated fibrin and interfere with fibrinolysis in diabetic patients.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Bobbink IW,Tekelenburg WL,Sixma JJ,de Boer HC,Banga JD,de Groot PGdoi
10.1006/bbrc.1997.7718subject
Has Abstractpub_date
1997-11-26 00:00:00pages
595-601issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(97)97718-4journal_volume
240pub_type
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