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Serum bile acids and their conjugates in breast-fed infants with prolonged jaundice
Insights
Breast milk jaundice in infants is linked to altered bile acid metabolism. Breast-fed infants with jaundice show a different bile acid profile compared to non-jaundiced infants, suggesting a potential cause.
Area of Science:
- Biochemistry
- Pediatrics
- Neonatology
Background:
- Prolonged jaundice in breast-fed infants, often termed breast milk jaundice, is a common clinical observation.
- The underlying mechanisms of breast milk jaundice are not fully understood, prompting investigations into metabolic factors.
- Bile acids play crucial roles in digestion and metabolism, and their alterations can indicate underlying pathologies.
Purpose of the Study:
- To investigate serum bile acid profiles in breast-fed infants with prolonged jaundice.
- To compare bile acid patterns between jaundiced breast-fed infants and non-jaundiced controls (breast-fed and bottle-fed).
- To explore the relationship between bile acid metabolism and the severity of jaundice in breast-fed infants.
Main Methods:
- Analysis of serum bile acids and their conjugates in 20 breast-fed infants with prolonged jaundice.
- Comparison with control groups of breast-fed and bottle-fed infants without jaundice.
- Determination of the glycine- to taurine-conjugated bile acid ratio (G/T ratio) as a key indicator of bile acid metabolism.
Main Results:
- Mean total serum bile acid levels were higher in jaundiced breast-fed infants, though not significantly different from controls.
- All breast-fed infants, jaundiced or not, predominantly had taurine-conjugated bile acids (G/T ratio < 1.00).
- Bottle-fed infants without jaundice predominantly had glycine-conjugated bile acids (G/T ratio > 1.00).
- A significantly lower mean G/T ratio was observed in jaundiced breast-fed infants with higher serum bilirubin levels (> 10 mg/100 ml).
Conclusions:
- Altered bile acid metabolism, characterized by a shift towards taurine conjugates, may be associated with the pathogenesis of breast milk jaundice.
- The findings suggest that specific bile acid profiles could be indicative of or contribute to prolonged jaundice in breast-fed infants.
- Further research is warranted to elucidate the precise role of bile acid dysregulation in breast milk jaundice.
Abstract:
Serum bile acids and their conjugates were analysed in 20 breast-fed infants with prolonged jaundice. The mean total bile acid levels in serum were increased in the breast-fed infants with jaundice, as compared with those in either breast- or bottle-fed infants without jaundice. However, there were no significant differences between the groups. All the breast-fed infants examined, regardless of association with jaundice, had a bile acid pattern dominated by taurine conjugates (the ratio of glycine- to taurine-conjugated bile acid, G/T ratio, less than 1.00). In contrast, the bottle-fed infants without jaundice had a pattern dominated by glycine conjugates (G/T ratio, more than 1.00). Among the breast-fed infants with jaundice, the mean G/T ratio in those who had serum bilirubin levels over 10 mg/100 ml was significantly lower than that in those who had serum bilirubin levels of less than 10 mg/100 ml. The altered bile acid metabolism might be associated with the pathology of breast milk jaundice.