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26-Hydroxycholesterol disulfate: metabolism and excretion in the normal neonate
Insights
Neonates excrete most endogenous 26-hydroxycholesterol via meconium, not urine. This study reveals a small intestinal pool of this compound, indicating it minimally impacts bile acid synthesis in newborns.
Area of Science:
- Biochemistry
- Neonatal Metabolism
- Steroid Analysis
Background:
- Endogenous 26-hydroxycholesterol plays a role in neonatal physiology.
- Understanding its metabolism is crucial for assessing newborn health.
- Meconium analysis offers insights into fetal and neonatal development.
Purpose of the Study:
- To quantify the pool size, metabolism, and excretion of endogenous 26-hydroxycholesterol in neonates.
- To evaluate the compound's contribution to bile acid synthesis.
- To establish non-invasive methods for studying neonatal metabolic transitions.
Main Methods:
- Administration of deuterated 26-hydroxycholesterol disulfate as a tracer to normal neonates.
- Collection and analysis of meconium and urine samples over the initial 72 hours of life.
- Isotope recovery measurements to track compound metabolism and excretion.
Main Results:
- Neonatal excretion of endogenous 26-hydroxycholesterol in meconium ranged from 327 to 1096 micrograms within 72 hours.
- Recovery of the administered isotope was high (66-98%), indicating effective tracking.
- Only trace amounts of 26-hydroxycholesterol were detected in urine, suggesting limited renal excretion.
Conclusions:
- Neonates possess a small intestinal pool of 26-hydroxycholesterol that is rapidly excreted.
- This compound does not significantly contribute to bile acid synthesis in the neonatal period.
- Developed techniques offer a non-invasive approach to studying neonatal metabolic changes.
Abstract:
Deuterated 26-hydroxycholesterol disulfate has been given in a tracer amount to neonates to evaluate the pool size, metabolism and excretion of the endogenously occurring compound in meconium. In a group of 5 normal neonates excretion of endogenous 26-hydroxycholesterol during the initial 72 h of life ranged from 327 to 1096 micrograms. Recovery of administered isotope during the same period was 66-98%. Only trace amounts of 26-hydroxycholesterol were recovered in urine. The findings indicate that relative to bile acid pool size, the normal neonate has a small intestinal pool of 26-hydroxycholesterol which, for the most part, is rapidly excreted and does not contribute significantly to bile acid synthesis. The techniques developed during the course of the study provide an approach to non invasive metabolic studies that give insights on the normal transition from fetal to neonatal life.