Impaired thrombin generation in beta 2-glycoprotein I null mice.

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The Journal of biological chemistry 2001 Apr 27;276(17):13817-21. Epub 2001 Jan 5.

Impaired thrombin generation in beta 2-glycoprotein I null mice.

Y Sheng;SW Reddel;H Herzog;YX Wang;T Brighton;MP France;SA Robertson;SA Krilis

Department of Medicine and the Department of Immunology, Allergy, and Infectious Disease, University of New South Wales, The St. George Hospital, Sydney, New South Wales 2217, Australia.

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Autoimmune antibodies to beta(2)-glycoprotein I (beta2GPI) have been proposed to be clinically relevant because of their strong association with thrombosis, miscarriage, and thrombocytopenia. By using a homologous recombination approach, beta2GPI-null mice were generated to begin to understand the physiologic and pathologic role of this prominent plasma protein in mammals. When beta2GPI heterozygotes on a 129/Sv/C57BL/6 mixed genetic background were intercrossed, only 8.9% of the resulting 336 offspring possessed both disrupted alleles. These data suggest that beta2GPI plays a beneficial role in implantation and/or fetal development in at least some mouse strains. Although those beta2GPI-null mice that were born appeared to be relatively normal anatomically and histologically, subsequent analysis revealed that they possessed an impaired in vitro ability to generate thrombin relative to wild type mice. Thus, beta2GPI also appears to play an important role in thrombin-mediated coagulation.

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