首页> 外文期刊>Nature >ABNORMAL BLOOD VESSEL DEVELOPMENT AND LETHALITY IN EMBRYOS LACKING A SINGLE VEGF ALLELE
【24h】

ABNORMAL BLOOD VESSEL DEVELOPMENT AND LETHALITY IN EMBRYOS LACKING A SINGLE VEGF ALLELE

机译:缺乏单个VEGF等位基因的胚胎中的异常血管发育和死亡

获取原文
获取原文并翻译 | 示例
           

摘要

THE endothelial cell-specific vascular endothelial growth factor (VEGF)(1-5) and its cellular receptors Flt-1 (refs 6,7) and Flk-1 (refs 8,9) have been implicated in the formation of the embryonic vasculature. This is suggested by their colocalized expression during embryogenesis(10,11) and the impaired vessel formation in Flk-1 (ref. 12) and Flt-1 (ref. 13) deficient embryos. However, because Flt-1 also binds placental growth factor(14,15), a VEGF homologue, the precise role of VEGF was unknown. Here we report that formation of blood vessels was abnormal, but not abolished, in heterozygous VEGF-deficient (VEGF(+/-)) embryos, generated by aggregation of embryonic stem (ES) cells with tetraploid embryos (T-ES)(16,17), and more impaired in homozygous VEGF-deficient (VEGF(-/-)) T-ES embryos, resulting in death at mid-gestation. Similar phenotypes were observed in F-1-VEGF(+/-) embryos, generated by germline transmission. We believe that this heterozygous lethal phenotype, which differs from the homozygous lethality in VEGF-receptor-deficient embryos, is unprecedented for a targeted autosomal gene inactivation, and is indicative of a tight dose-dependent regulation of embryonic vessel development by VEGF. [References: 28]
机译:内皮细胞特异性血管内皮生长因子(1-5)及其细胞受体Flt-1(refs 6,7)和Flk-1(refs 8,9)与胚胎脉管系统的形成有关。 。这是由于它们在胚胎发生过程中的共定位表达(10,11)以及Flk-1(参考文献12)和Flt-1(参考文献13)缺陷胚胎的血管形成受损。然而,由于Flt-1也结合胎盘生长因子(14,15),即VEGF同源物,因此VEGF的确切作用尚不清楚。在这里,我们报道了在杂合性VEGF缺陷(VEGF(+/-))胚胎中,血管形成是异常的,但没有被消除,这是由胚胎干(ES)细胞与四倍体胚胎(T-ES)聚集而产生的(16 ,17),并且在纯合VEGF缺陷型(VEGF(-/-))T-ES胚胎中受损更大,导致妊娠中期死亡。在种系传播产生的F-1-VEGF(+/-)胚胎中观察到相似的表型。我们相信,这种杂合性致死表型不同于VEGF受体缺陷型胚胎中的纯合致死性,对于靶向常染色体基因失活是空前的,并且表明了VEGF对胚胎血管发育的严格剂量依赖性调节。 [参考:28]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号