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Postnatal gender-dependent maturation of cellular cysteine uptake
Jean-Claude Lavoie1, Thérèse Rouleau, Anita C Truttmann
1Research Centre and Neonatal Service, Hĵpital Ste-Justine, Montreal, Que, Canada. jclavoie@justine.umontreal.ca
Free Radical Research
|November 8, 2002
Summary
Cysteine uptake is limited in premature infants, especially males, impacting glutathione levels. Female infants show maturity-related improvements in cysteine uptake and glutathione, suggesting a key role for this amino acid.
Area of Science:
- Biochemistry
- Neonatal Physiology
- Nutritional Science
Background:
- Glutathione synthesis is crucial for premature infants.
- Cysteine availability is a rate-limiting factor in glutathione synthesis.
- Immature cysteine uptake may explain low glutathione levels in premature infants.
Purpose of the Study:
- To investigate the impact of maturity and gender on cysteine uptake in newborns.
- To determine the relationship between cysteine uptake and glutathione levels.
- To understand gender-specific differences in neonatal cysteine metabolism.
Main Methods:
- Measured L-[35S] cysteine incorporation in leukocytes from cord blood and tracheal aspirates.
- Analyzed samples from newborns of varying gestational and postnatal ages and gender.
- Correlated cysteine uptake with glutathione levels in tracheal aspirates.
Main Results:
- Newborn girls' maturity positively influenced cysteine uptake, explaining 78% of glutathione variation.
- Gestational and postnatal ages did not affect cysteine uptake in newborn boys.
- Significant gender-related differences in cysteine uptake and glutathione levels were observed.
Conclusions:
- Cysteine uptake is a limiting factor for glutathione levels in premature infants, contributing to gender-related differences.
- Immature cysteine uptake in premature infants raises concerns about cysteine bioavailability in parenteral nutrition.
- This study highlights the importance of cysteine availability for neonatal antioxidant defense and development.