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Developmental changes in bilirubin production in the rat
Journal of Pediatric Gastroenterology and Nutrition
|January 1, 1983
Summary
Bilirubin production and early labeling rates in rats are high in newborns and decrease rapidly with age. Hepatic heme oxygenase activity correlates with these changes, but phenobarbital affects labeling independently of enzyme activity.
Area of Science:
- Biochemistry
- Developmental Biology
- Pharmacology
Background:
- Bilirubin metabolism is crucial for neonatal health.
- Understanding postnatal changes in bilirubin production is essential.
Purpose of the Study:
- To investigate total bilirubin production and early labeling of bilirubin (ELB) rates in developing rats.
- To correlate these rates with hepatic heme oxygenase activity.
- To examine the effect of phenobarbital on bilirubin metabolism.
Main Methods:
- Quantified total bilirubin production via endogenous carbon monoxide excretion (VeCO).
- Measured ELB using glycine-2-14C and delta-aminolevulinic acid-5-14C incorporation into expired 14CO.
- Assessed hepatic heme oxygenase activity.
- Administered phenobarbital to weanling rats.
Main Results:
- VeCO and ELB were significantly higher in neonatal rats compared to adults.
- Hepatic heme oxygenase activity followed a similar postnatal pattern to ELB.
- Phenobarbital increased ELB from glycine but did not alter heme oxygenase activity.
Conclusions:
- Bilirubin production and ELB rates undergo significant postnatal development in rats.
- Hepatic heme oxygenase activity is a useful but not always perfect indicator of in vivo ELB.
- Phenobarbital influences bilirubin labeling pathways independently of heme oxygenase activity.