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Placental apoptosis in normal human pregnancy
S C Smith1, P N Baker, E M Symonds
1University Department of Obstetrics and Gynaecology, University of Nottingham, City Hospital, United Kingdom.
American Journal of Obstetrics and Gynecology
|July 1, 1997
Summary
Apoptosis, programmed cell death, was confirmed in human placental tissue. Its incidence significantly increases from the first to the third trimester of pregnancy.
Area of Science:
- Reproductive Biology
- Cell Biology
- Histology
Background:
- Apoptosis, or programmed cell death, is a fundamental biological process.
- Understanding placental apoptosis is crucial for comprehending pregnancy development and potential complications.
Purpose of the Study:
- To definitively confirm the presence of apoptosis in human placental tissue.
- To accurately quantify the incidence of apoptosis across different stages of pregnancy.
Main Methods:
- Human placental samples were collected from the first and third trimesters.
- Apoptosis was identified using light microscopy, electron microscopy, and TUNL (terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick end-labeling) staining.
- Incidence was quantified via light microscopy.
Main Results:
- Apoptosis was conclusively demonstrated in placental tissue from both trimesters.
- The incidence of apoptosis was significantly higher in the third trimester (0.14%) compared to the first trimester (0.07%).
- Statistical analysis confirmed a significant increase in apoptosis as pregnancy progressed (p < 0.01).
Conclusions:
- Placental apoptosis incidence rises significantly with advancing pregnancy.
- This increase suggests a potential role for apoptosis in normal placental development and aging.