| Acute phase protein alpha 1-acid glycoprotein interacts with plasminogen activator inhibitor type 1 and stabilizes its inhibitory activity. | |
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MedLine Citation:
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PMID: 11418606 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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alpha(1)-Acid glycoprotein, one of the major acute phase proteins, was found to interact with plasminogen activator inhibitor type 1 (PAI-1) and to stabilize its inhibitory activity toward plasminogen activators. This conclusion is based on the following observations: (a) alpha(1)-acid glycoprotein was identified to bind PAI-1 by a yeast two-hybrid system. Three of 10 positive clones identified by this method to interact with PAI-1 contained almost the entire sequence of alpha(1)-acid glycoprotein; (b) this protein formed complexes with PAI-1 that could be immunoprecipitated from both the incubation mixtures and blood plasma by specific antibodies to either PAI-1 or alpha(1)-acid glycoprotein. Such complexes could be also detected by a solid phase binding assay; and (c) the real-time bimolecular interactions monitored by surface plasmon resonance indicated that the complex of alpha(1)-acid glycoprotein with PAI-1 is less stable than that formed by vitronectin with PAI-1, but in both cases, the apparent K(D) values were in the range of strong interactions (4.51 + 1.33 and 0.58 + 0.07 nm, respectively). The on rate for binding of PAI-1 to alpha(1)-glycoprotein or vitronectin differed by 2-fold, indicating much faster complex formation by vitronectin than by alpha(1)-acid glycoprotein. On the other hand, dissociation of PAI-1 bound to vitronectin was much slower than that from the alpha(1)-acid glycoprotein, as indicated by 4-fold lower k(off) values. Furthermore, the PAI-1 activity toward urokinase-type plasminogen activator and tissue-type plasminogen activator was significantly prolonged in the presence of alpha(1)-acid glycoprotein. These observations suggest that the complex of PAI-1 with alpha(1)-acid glycoprotein can play a role as an alternative reservoir of the physiologically active form of the inhibitor, particularly during inflammation or other acute phase reactions. |
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Authors:
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J Boncela; I Papiewska; I Fijalkowska; B Walkowiak; C S Cierniewski |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2001-06-19 |
Journal Detail:
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Title: The Journal of biological chemistry Volume: 276 ISSN: 0021-9258 ISO Abbreviation: J. Biol. Chem. Publication Date: 2001 Sep |
Date Detail:
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Created Date: 2001-09-17 Completed Date: 2001-10-25 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 2985121R Medline TA: J Biol Chem Country: United States |
Other Details:
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Languages: eng Pagination: 35305-11 Citation Subset: IM |
Affiliation:
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Center for Microbiology and Virology, Polish Academy of Sciences 93-232 Lodz, Poland. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Humans Orosomucoid / metabolism* Plasminogen Activator Inhibitor 1 / metabolism* Precipitin Tests Protein Binding Surface Plasmon Resonance Tissue Plasminogen Activator / antagonists & inhibitors Two-Hybrid System Techniques Urokinase-Type Plasminogen Activator / antagonists & inhibitors Vitronectin / metabolism |
| Chemical | |
Reg. No./Substance:
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0/Orosomucoid; 0/Plasminogen Activator Inhibitor 1; 0/Vitronectin; EC 3.4.21.68/Tissue Plasminogen Activator; EC 3.4.21.73/Urokinase-Type Plasminogen Activator |
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