Related Experiment Videos
Invasive cytotrophoblast apoptosis in pre-eclampsia.
O Genbacev1, E DiFederico, M McMaster
1Department of Stomatology, University of California, San Francisco, 94143-0512, USA.
Human Reproduction (Oxford, England)
|February 26, 2000
Summary
Pre-eclampsia is linked to increased apoptosis, or programmed cell death, in placental cytotrophoblasts invading the uterus. This widespread cell death may explain the condition's sudden onset and associated clotting issues.
Area of Science:
- Reproductive Biology
- Maternal-Fetal Medicine
- Cellular Biology
Background:
- Pre-eclampsia is a pregnancy complication characterized by maternal endothelial dysfunction.
- Normal pregnancy involves cytotrophoblast stem cell differentiation for placental invasion and maternal blood flow.
- In pre-eclampsia, impaired cytotrophoblast differentiation compromises placental vascularization.
Purpose of the Study:
- To investigate if abnormal differentiation or hypoxia causes apoptosis in invasive cytotrophoblasts.
- To quantify apoptosis in uterine-invading cytotrophoblasts in pre-eclampsia.
Main Methods:
- Utilized TUNEL (terminal deoxynucleotidyl transferase-mediated dUTP nick end labelling) staining for DNA strand breaks.
- Examined placental and uterine wall tissue sections from pre-eclamptic and control pregnancies.
- Assessed Bcl-2 expression, a key survival factor, in trophoblast cells.
Main Results:
- Significantly higher rates of cytotrophoblast apoptosis (15-50% in 8/9 samples) were observed in the uterine wall of pre-eclamptic patients compared to controls.
- Apoptotic invasive cytotrophoblasts in pre-eclampsia samples lacked Bcl-2 expression.
- Control samples exhibited minimal to no apoptosis in these cells.
Conclusions:
- Pre-eclampsia is associated with extensive apoptosis of uterine-invading cytotrophoblasts.
- The degree of programmed cell death in this cytotrophoblast subpopulation may contribute to the abrupt symptom manifestation and coagulopathies seen in pre-eclampsia.