Structure and function of murine alphaIIbbeta3 (GPIIb/IIIa): studies using monoclonal antibodies and beta3-null mice,.

Abstract:

:The alphaIIbeta3 receptor (GPIIb/IIIa) is the only platelet-specific integrin receptor and the most abundant adhesion/aggregation receptor on the surface of human platelets. Since mice are increasingly being used as models of human disease, we analyzed the structure and function of murine platelet alphaIIbeta3, utilizing both beta3 integrin-deficient mice, who have a phenotype that resembles Glanzmann thrombasthenia, and our hamster monoclonal antibody (mAb) 1B5 to murine alphaIIbbeta3. By immunoblot analysis, flow cytometry, and mAb binding studies, mouse platelets express abundant amounts of alphaIIbbeta3 (60-80,000 copies/platelet). Like their human counterparts, murine alphaIIb and beta3 exhibit different electrophoretic motilities under nonreducing (aIIb 135k Da; beta3 92k Da) and reducing (aIIb 120k Da; beta3 108k Da) conditions, and the alphaIIbbeta3 complex is dissociated by EDTA at pH 8 and 37 degrees C. Murine beta3 is less susceptible to proteolysis by plasmin than is human beta3. In addition to defective platelet aggregation, mouse platelets lacking alphaIIbbeta3 and alphaVbeta3 are unable to adhere to fibrinogen and prothrombin, but retain the ability to adhere to fibronectin and collagen. Following platelet activation, beta3-null platelets express slightly less P-selectin than do wild-type mouse platelets. Moreover, beta3-null platelets have altered tyrosine phosphorylation patterns following thrombin- and collagen-induced aggregation. These results suggest fundamental similarities between human and mouse platelet activation and aggregation, but delineate subtle differences that need to be considered when comparing studies from mice and humans.

journal_name

Thromb Haemost

authors

Smyth SS,Tsakiris DA,Scudder LE,Coller BS

keywords:

subject

Has Abstract

pub_date

2000-12-01 00:00:00

pages

1103-8

issue

6

eissn

0340-6245

issn

2567-689X

pii

00121103

journal_volume

84

pub_type

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