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Placental transfer of cholesterol-4-14C into rabbit and guinea pig fetus
Insights
Maternal blood transfers significant cholesterol to fetuses, with about 22% of fetal serum cholesterol originating from the mother. Dietary cholesterol influences this transfer but not newborn serum levels.
Area of Science:
- Biochemistry
- Developmental Biology
- Perinatal Medicine
Background:
- Cholesterol is vital for fetal development.
- Understanding maternal-fetal cholesterol transfer is crucial for perinatal health.
Purpose of the Study:
- To quantify maternal-to-fetal cholesterol transfer in guinea pigs.
- To investigate the impact of maternal cholesterol on fetal cholesterol levels and distribution.
Main Methods:
- Administered a cholesterol-4-(14)C tracer dose to pregnant guinea pigs.
- Analyzed maternal and fetal blood and tissue cholesterol content and specific activity at parturition.
- Compared isotopic specific activities between maternal and neonatal serum and tissues.
Main Results:
- Approximately 22% of fetal serum cholesterol was maternally derived.
- Newborn tissues generally mirrored serum cholesterol specific activity, except for brain tissue (8.4%).
- Maternal cholesterol intake increased the proportion of fetal cholesterol from maternal circulation but not newborn serum levels.
Conclusions:
- Significant maternal-to-fetal cholesterol transfer occurs across the placenta.
- Newborns rely considerably on maternal cholesterol, with some tissue-specific variations in uptake.
- Placental cholesterol transfer is rapid and a key source for neonatal cholesterol
Abstract:
A tracer dose of cholesterol-4-(14)C was given daily in the diet of six pregnant guinea pigs to establish an isotopic steady state. At the time of parturition, maternal and fetal blood and fetal tissues were collected and analyzed for cholesterol content and cholesterol specific activity. A comparison of these specific activities in neonatal and maternal serum indicated that about 22% of the fetal serum cholesterol was transferred from maternal blood. In the newborn, tissues generally had the same cholesterol specific activity as serum. Brain tissue was an exception in having a specific activity only 8.4% of that of serum. Dietary cholesterol did not increase serum cholesterol levels in the newborn but did increase the percentage of fetal cholesterol derived from the maternal circulation. The rapid transfer of cholesterol-4-(14)C across the placenta was indicated by the appearance of this isotope in the newborn 2 days after its administration to pregnant rabbits. A considerable amount of the cholesterol content of newborn guinea pigs and rabbits originated from the maternal blood.