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Normal and atypical butyrylcholinesterases in placental development, function, and malfunction
M Sternfeld1, J Rachmilewitz, Y Loewenstein-Lichtenstein
1Department of Biological Chemistry, Hebrew University of Jerusalem, Israel.
Cellular and Molecular Neurobiology
|June 1, 1997
Summary
Butyrylcholinesterase (BuChE) protects fetuses from drug exposure. Heterozygous atypical BuChE variants offer protection, while homozygous atypical variants do not, suggesting a role in preventing placental malfunction.
Area of Science:
- Biochemistry
- Pharmacology
- Obstetrics
Background:
- In utero exposure to xenobiotics can cause spontaneous abortion and placental issues.
- Butyrylcholinesterase (BuChE) is a key protein that detoxifies harmful compounds.
- Understanding BuChE's role in placental development is crucial for fetal health.
Purpose of the Study:
- To investigate BuChE expression during placental development.
- To analyze the interaction of atypical BuChE variants with toxins.
- To determine the correlation between BuChE variants and placental malfunction.
Main Methods:
- Reverse transcription-polymerase chain reaction (RT-PCR) for gene expression.
- Cytochemical staining for enzyme activity.
- Genotype analysis and drug-binding affinity assays.
Main Results:
- BuChE and acetylcholinesterase (AChE) mRNA are present throughout gestation.
- BuChE activity dominates in early placenta, while AChE activity is prominent in term placenta.
- Atypical BuChE variants show significantly lower affinity for cocaine and alpha-solanine compared to normal BuChE.
Conclusions:
- Heterozygous atypical BuChE carriers may protect fetuses from drug/poison exposure.
- Homozygous atypical BuChE variants do not offer similar protection.
- Heterozygous carriers of atypical BuChE are less frequent in patients with placental malfunction, suggesting a protective role.