Abstract
Angiogenesis is crucial in human development. Extravillous trophoblast (EVT) cells mimic endothelial cells in angiogenesis during endovascular differentiation, inducing a remodeling of spiral arteries that increases blood flow toward the intravillous space. We have previously shown that tumor necrosis factor (TNF) alpha regulates expression of ITGA6 and ITGA1, which are involved in cell survival, in the human EVT cell line TCL1. To further investigate endovascular differentiation, we examined the effects of vascular endothelial growth factor (VEGF), TNF, and extracellular matrix (ECM) on TCL1 cells. Seeded on Matrigel, TCL1 cells show tube-like formation that specifically recalls morphological changes in endothelial cells. Anti-ITGAV/ITGB3 antibodies significantly reduced the size of the capillary network (P < 0.05) on Matrigel and also suppressed TNF-induced apoptosis (P < 0.05) in TCL1 cells. VEGF induced expression of ITGAV/ITGB3 subunits and protein aggregation, as in the case of TNF, which in turn, induces synthesis of VEGF in TCL1 cells. Soluble FLT1 suppressed these activities in TCL1 cells, indicating that signals involving VEGF axis are essential for endovascular differentiation. These results suggest that TNF, VEGF, and ECM collaboratively regulate EVT behavior, including cell survival and endovascular differentiation, through integrin signaling during establishment and maintenance of successful human pregnancies.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.