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Oncodevelopmental alpha-fetoprotein acts as a selective proangiogenic factor on endothelial cell from the
Olin D Liang1, Thomas Korff, Jessica Eckhardt
1Department of Obstetrics and Gynecology, Justus-Liebig-University, D-35385 Giessen, Germany.
The Journal of Clinical Endocrinology and Metabolism
|March 6, 2004
Summary
Alpha-fetoprotein (AFP) promotes blood vessel growth in the placenta during pregnancy. This oncodevelopmental protein may be crucial for forming a functional fetomaternal vasculature in later pregnancy stages.
Area of Science:
- Reproductive biology
- Vascular biology
- Developmental biology
Background:
- Angiogenesis and vascular remodeling are vital for placental and uterine vasculature development during pregnancy.
- Alpha-fetoprotein (AFP), an oncodevelopmental albumin homolog, is synthesized by the fetus and linked to vascularized tumors.
Purpose of the Study:
- To investigate the angiogenic activity of AFP.
- To explore AFP's role in the fetomaternal unit during pregnancy.
Main Methods:
- Immunohistochemistry to detect AFP-binding proteins in placental blood vessels.
- In vitro studies on endothelial cell proliferation and migration (placental, uterine, umbilical vein).
- In vivo chick chorioallantoic membrane assay for angiogenesis.
Main Results:
- AFP-binding proteins are present in placental blood vessels from the second and third trimesters.
- Low concentrations of AFP stimulate or enhance vascular endothelial growth factor (VEGF)-induced endothelial cell proliferation and sprout formation via a MAPK-dependent pathway.
- AFP promotes blood vessel formation in vivo and specifically affects fetomaternal endothelial cells, not umbilical vein endothelial cells without VEGF.
Conclusions:
- AFP acts as a specific proangiogenic factor for endothelial cells within the fetomaternal unit.
- This activity is prominent during advanced stages of pregnancy.
- AFP's role in vascular development is critical for a functional pregnancy vasculature.