Genetic variation responsible for mouse strain differences in integrin alpha 2 expression is associated with altered platelet responses to collagen.

Abstract:

:As mouse models have become commonplace for studying hemostasis and thrombosis, we considered whether the mouse system had utility for assessing genetic alterations in platelet receptors. Platelets from 5 mouse strains (C57BL/6 [C57], FVB/N [FVB], BALB/c, C3H/He, and 129Sv) showed only minor differences in the expression of integrin alpha(IIb), integrin beta(3), glycoprotein (GP) Ib alpha, or GPVI across strains. However, FVB platelets expressed approximately 50% the level of integrin alpha(2) as platelets from other strains (P <.0001). We bred FVB mice with C57 and assessed alpha(2) expression in FVB/C57xFVB/C57 (F2) offspring. Linkage analysis demonstrated the gene responsible for alpha(2) levels is tightly linked to the D13mit260 marker (log odds [lod] score 6.7) near the alpha(2) gene. FVB platelets showed reduced aggregation and a longer lag phase to collagen. FVB and C57 platelets aggregated similarly to collagen-related peptide, but FVB platelets showed a reduction in rhodocytin-induced Syk and PLC gamma 2 tyrosine phosphorylation. Thus, FVB platelets express half the level of alpha(2) as other mouse strains, a trait linked to the alpha(2) gene and seemingly responsible for reduced platelet aggregation to collagen. These strain differences serve as a useful model for the 2-fold difference in human platelet alpha(2)beta(1) expression and demonstrate that alpha(2)beta(1) participates in signaling during platelet activation.

journal_name

Blood

journal_title

Blood

authors

Li TT,Larrucea S,Souza S,Leal SM,López JA,Rubin EM,Nieswandt B,Bray PF

doi

10.1182/blood-2003-10-3721

subject

Has Abstract

pub_date

2004-05-01 00:00:00

pages

3396-402

issue

9

eissn

0006-4971

issn

1528-0020

pii

2003-10-3721

journal_volume

103

pub_type

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