mortality/aging
• homozygotes are completely resorbed by E9.5
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embryo
• homozygotes exhibit an overall growth retardation at E8.5, followed by rapid resorption within the next 10-12 hrs
(J:74855)
• anti-coagulation treatment of pregnant mothers with heparin or warfarin does not overcome the growth defect, with E9.5 homozygotes resembling E8.5 wild-type mice
(J:82224)
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• at E8.5, homozygotes contain a reduced number of diploid ectoplacental trophoblast cells (63.5% of wild-type), as a result of reduced cell proliferation
• anti-coagulation therapy with heparin or warfarin does not overcome the growth defect in the ectoplacental cone
• growth arrest of trophoblast cells is not mediated by fibrin, but is a likely result of engagement of protease-activated receptors by coagulation factors
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• at E8.5, BrdU incorporation is marginally lower in mutant polyploid giant trophoblast cells, but is significantly reduced in diploid trophoblast cells of the ectoplacental cone
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• at E8.5, all homozygotes exhibit a significant increase in TUNEL+ giant trophoblast cells but only rarely in ectoplacental cone cells, indicating selective cell death of giant trophoblast cells
• at E8.5, BrdU incorporation is only marginally reduced in mutant polyploid giant trophoblast cells
• anti-coagulation treatment of pregnant mothers with heparin or warfarin inhibits cell death of giant trophoblast cells
• death of giant trophoblast cells is caused by conversion of the thrombin substrate fibrinogen to fibrin and subsequent formation of fibrin degradation products
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