Postnatal gender-dependent maturation of cellular cysteine uptake

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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
PubMed

Insights

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.
Abstract

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