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Angiogenesis and intrauterine growth restriction
1Department of Reproductive and Vascular Biology, The Medical School, Birmingham, Edgbaston, B15 2TT, UK.
Summary
Intrauterine growth restriction (IUGR) disrupts placental development by altering vascular growth factors. These factors, including vascular endothelial growth factor (VEGF) and angiopoietin, also regulate trophoblast behavior independently of blood vessel formation.
Area of Science:
- Reproductive biology
- Developmental biology
- Vascular biology
Background:
- Human placental development requires coordinated angiogenesis and trophoblast outgrowth.
- Intrauterine growth restriction (IUGR) compromises these processes.
- Adaptive angiogenesis in IUGR placentas is linked to dysregulated vascular growth factor expression.
Purpose of the Study:
- To investigate the role of vascular endothelial growth factor (VEGF), placenta growth factor (PlGF), and angiopoietin in placental development and IUGR.
- To explore the autocrine functions of these factors on trophoblast behavior.
Main Methods:
- Analysis of expression profiles of VEGF, PlGF, and angiopoietin during placental development.
- Examination of VEGF receptors and angiopoietin receptor Tie-2 expression on trophoblast.
- Assessment of the impact of receptor activation on trophoblast proliferation, migration, and nitric oxide production.
Main Results:
- An imbalance in VEGF, PlGF, and angiopoietin expression profiles characterizes adaptive angiogenesis in IUGR placental villi.
- VEGF and angiopoietin receptors (Tie-2) are expressed on trophoblast cells.
- Activation of these receptors stimulates trophoblast proliferation, migration, and nitric oxide synthesis.
Conclusions:
- Vascular growth factors act as autocrine regulators of trophoblast behavior.
- These factors are crucial for the development of the utero-/feto-placental circulation.
- Their role in trophoblast regulation is independent of their established functions in vascular endothelium.