Placental overgrowth and fertility defects in mice with a hypermorphic allele of epidermal growth factor receptor

Abstract Epidermal growth factor receptor (EGFR) is a member of the ERBB family of receptor tyrosine kinases that has been shown to play an important developmental and physiologic role in many aspects of pregnancy. We have previously shown in mice that Egfrtm1Mag nullizygous placentas have fewer pro...
Ausführliche Beschreibung

Abstract Epidermal growth factor receptor (EGFR) is a member of the ERBB family of receptor tyrosine kinases that has been shown to play an important developmental and physiologic role in many aspects of pregnancy. We have previously shown in mice that Egfrtm1Mag nullizygous placentas have fewer proliferative trophoblasts than wild-type and exhibit strain-specific defects in the spongiotrophoblast and labyrinth layers. In this study we used mice with the hypermorphic EgfrDsk5 allele to study the effects of increased levels of EGFR signaling on placental development. On three genetic backgrounds, heterozygosity for EgfrDsk5 resulted in larger placental size with a more prominent spongiotrophoblast layer and increased expression of glycogen cell-specific genes. The C3HeB/FeJ strain showed additional placental enlargement of EgfrDsk5 homozygotes with a significant number of homozygous embryos dying prior to 15.5 days post-coitus (dpc). We also observed strain-specific subfertility in EgfrDsk5 heterozygous females and pregnancy loss was dependent on maternal factors rather than embryo genotype. Higher levels of phospho-EGFR were detected in the uterus of EgfrDsk5 heterozygotes but the structure of EgfrDsk5 heterozygous nonpregnant uteri appeared similar to wild-type. Collectively, our results demonstrate that mice with increased levels of EGFR signaling exhibit an extensive level of genetic background-dependent phenotypic variability. In addition, EGFR promotes growth of the placental spongiotrophoblast layer in mice, and EGFR expressed in the uterine stroma may play an underappreciated role in preparation of the uterus for embryo implantation. Ausführliche Beschreibung