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Postnatal decline in pyridoxal phosphate and riboflavin. Accentuation by phototherapy
Insights
Phototherapy for neonatal jaundice significantly depletes riboflavin and pyridoxal phosphate (PALP) levels. This vitamin cofactor reduction may impact neurotransmitter synthesis and warrants further investigation into supplementation for jaundiced infants.
Area of Science:
- Biochemistry
- Neonatal Medicine
- Nutritional Science
Background:
- Riboflavin is crucial for converting pyridoxine (vitamin B6) to pyridoxal phosphate (PALP).
- PALP is an essential coenzyme in metabolic pathways, including neurotransmitter synthesis.
- Both riboflavin and pyridoxine are photosensitive, with conflicting reports on phototherapy's in vivo effects.
Purpose of the Study:
- To evaluate the riboflavin and PALP status in neonates undergoing phototherapy.
- To compare vitamin cofactor levels between neonates receiving phototherapy and healthy controls.
Main Methods:
- Study included 25 full-term neonates receiving phototherapy and 16 healthy controls.
- Assessed levels of riboflavin and pyridoxal phosphate (PALP) in both groups.
Main Results:
- Both riboflavin and PALP levels decreased in all infants studied.
- A significantly greater decrease in these vitamin cofactors was observed in the phototherapy group.
- The clinical significance of the observed PALP decline is yet to be established.
Conclusions:
- Phototherapy in neonates leads to a significant reduction in riboflavin and PALP levels.
- Decreased PALP availability might contribute to behavioral changes in jaundiced, irradiated neonates.
- Further research is needed to understand postnatal vitamin decline and the benefits of pyridoxine supplementation, especially for infants receiving phototherapy.
Abstract:
Riboflavin is a cofactor in the conversion of pyridoxine (vitamin B6) to pyridoxal phosphate (PALP), an essential coenzyme in numerous metabolic pathways, including neurotransmitter synthesis. Riboflavin and pyridoxine are light sensitive in vitro, and conflicting results have been reported on the in vivo effects of phototherapy on riboflavin. We studied 25 full-term neonates receiving phototherapy and 16 healthy controls to evaluate their riboflavin and PALP status. Both vitamin cofactors decreased in both sets of infants, but significantly more so in the irradiated group. While the biologic or clinical importance of a modest biochemical decline in the level of PALP has not been established, it is possible that transient behavioral changes in irradiated, jaundiced neonates could be mediated by decreased availability of PALP. The mechanism for the postnatal decline and the desirability of routine supplementation with pyridoxine, especially in irradiated infants, require further study.