ABSENCE OF THE BLOOD-CLOTTING REGULATOR THROMBOMODULIN CAUSES EMBRYONIC LETHALITY IN MICE BEFORE DEVELOPMENT OF A FUNCTIONAL CARDIOVASCULAR-SYSTEM

被引:206
作者
HEALY, AM [1 ]
RAYBURN, HB [1 ]
ROSENBERG, RD [1 ]
WEILER, H [1 ]
机构
[1] MIT,DEPT BIOL,CAMBRIDGE,MA 02139
关键词
GENE TARGETING; EMBRYONIC GROWTH RETARDATION;
D O I
10.1073/pnas.92.3.850
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
We have targeted the murine thrombomodulin (TM) gene in embryonic stem cells and generated embryos as well as mice with TM deficiency. The heterozygous TM-deficient (TM(+)/(-)) mice as compared to wild-type (TM(+)/(+)) littermates exhibit 50% reductions in the levels of TM mRNA and TM protein. However, TM(+)/(-) mice appear normal and are free of thrombotic complications. The homozygous TM-deficient (TM(-)/(-)) embryos die before embryonic day 9.5. An overall retardation in growth and development of TM(-)/(-) embryos is first evident on embryonic day 8.5 (8-12 somite pairs). However, no specific pathologic abnormalities are observed. These initial changes take place at a time when TM is normally expressed in the parietal yolk sac. The removal of embryonic day 7.5 TM(-)/(-) embryos from maternal decidua and their subsequent culture in vitro allow development to proceed to stages not observed in vivo (13-20 somite pairs) with the appearance of normal blood vessels in the visceral yolk sac and embryo. The results of our studies suggest that the failure of TM(-)/(-) embryos to survive at mid-gestation is a consequence of dysfunctional maternal-embryonic interactions caused by the absence of TM in the parietal yolk sac and demonstrate that the receptor is necessary for normal embryonic development in utero.
引用
收藏
页码:850 / 854
页数:5
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