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Increase in bilirubin-binding affinity of serum with age of infant
The Journal of Pediatrics
|March 1, 1975
Insights
Infant serum
Area of Science:
- Biochemistry
- Pediatrics
- Neonatology
Background:
- Serum albumin is the primary transporter of bilirubin in the blood.
- Bilirubin binding affinity to albumin is crucial for preventing hyperbilirubinemia in newborns.
- Changes in albumin binding capacity during infancy may impact bilirubin metabolism.
Purpose of the Study:
- To investigate the developmental changes in bilirubin-binding affinity of infant serum.
- To determine the age at which infant serum bilirubin-binding affinity reaches adult levels.
Main Methods:
- Sephadex gel filtration was employed to assess bilirubin-binding capacity.
- Serum samples were collected from infants at various developmental stages.
Main Results:
- Bilirubin-binding affinity in infant serum increased significantly after the first week of life.
- Adult-level binding affinity was observed by 5 months of age.
- The observed increase may correlate with a shift to adult serum albumin or reduced competing substances.
Conclusions:
- Infant serum's capacity to bind bilirubin undergoes significant development during the first five months of life.
- These developmental changes are critical for understanding bilirubin homeostasis in neonates and infants.
- Further research is warranted to elucidate the precise molecular mechanisms driving these affinity changes.
Abstract:
The bilirubin-binding affinity of infant serum, as determined by Sephadex gel filtration, began to increase during the first week of life and continued to increase gradually until the age of 5 months, when it reached that of adult serum. This increase might be due to a transition from a fetal to an adult type of serum albumin and/or to a decrease in the concentration in serum of the substances thought to compete with bilirubin for binding to albumin.