S-nitrosylation of tissue-type plasminogen activator confers vasodilatory and antiplatelet properties on the enzyme.
Tissue-type plasminogen activator (t-PA) reacts upon exposure to endothelium-derived relaxing factor (EDRF) by way of the enzyme's single free sulfhydryl (Cys-83) to form a stable S-nitrosothiol protein adduct. S-nitrosylation endows t-PA with potent vasodilatory and antiplatelet properties that are accompanied by elevations in intracellular cyclic GMP analogous to those induced by low molecular weight (e.g., S-nitroso amino acid) S-nitrosothiols. Moreover, this chemical modification does not adversely affect the catalytic efficiency of t-PA, the fibrin stimulation of this activity, the binding of t-PA to fibrinogen, or the interaction of the enzyme with its physiologic serine protease inhibitor, plasminogen-activator inhibitor type I. The coupling of vasodilatory, antiplatelet, and fibrinolytic properties in one molecule makes the S-nitrosylated t-PA a unique molecular species and may provide insight into the mechanisms by which the endothelium maintains vessel patency. These data also suggest a pharmacologic approach to treatment of thromboocclusive disorders.
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Related Subject Headings
- Vasodilator Agents
- Tissue Plasminogen Activator
- Structure-Activity Relationship
- Platelet Aggregation Inhibitors
- Platelet Aggregation
- Nitroso Compounds
- Kinetics
- In Vitro Techniques
- Humans
- Fibrinogen
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Vasodilator Agents
- Tissue Plasminogen Activator
- Structure-Activity Relationship
- Platelet Aggregation Inhibitors
- Platelet Aggregation
- Nitroso Compounds
- Kinetics
- In Vitro Techniques
- Humans
- Fibrinogen