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A study of protein turnover in preterm neonates using 15N enrichment of urinary ammonia
Insights
This study used labeled yeast protein to measure infant protein metabolism. The non-invasive technique showed significant individual variation but is promising for monitoring nitrogen and protein metabolism in preterm infants.
Area of Science:
- Neonatal nutrition
- Biochemical research
- Pediatric metabolism
Background:
- Accurate assessment of protein metabolism is crucial for preterm infants.
- Existing methods for measuring protein turnover can be invasive or complex.
- Developing non-invasive techniques is essential for monitoring infant health.
Purpose of the Study:
- To evaluate a novel, non-invasive method for measuring protein turnover, synthesis, and breakdown in preterm infants.
- To assess the feasibility and reproducibility of using 15N-labeled yeast protein as a tracer.
- To explore the relationship between protein turnover and infant age.
Main Methods:
- Administered hydrolyzed yeast protein labeled with stable isotope 15N as an intragastric bolus dose.
- Determined protein turnover by measuring 15N enrichment in urinary ammonia over 12-hour periods.
- Studied six preterm infants (birthweight < 1500 g, gestation 27-35 weeks) multiple times between 13 and 54 days post-natally.
Main Results:
- No significant correlation was found between protein turnover and increasing post-conceptional or post-natal age.
- Considerable interindividual variation in protein turnover was observed.
- Reproducibility of the measurements varied among different infants.
Conclusions:
- 15N-labeled yeast protein offers a convenient and non-invasive method for assessing nitrogen and protein metabolism in infants.
- The technique warrants further assessment for serial monitoring of infant metabolism.
- Significant interindividual variability highlights the need for personalized nutritional strategies.
Abstract:
Hydrolysed yeast protein labelled with 15N was used to measure protein turnover, protein synthesis and protein breakdown in preterm infants. The yeast tracer was given as a bolus intragastric dose and protein turnover was determined from the 15N enrichment of urinary ammonia over known periods of about 12 h. Six boys (birthweight less than 1500 g) with gestation of 27-35 weeks were studied either two or three times at post-natal ages ranging from 13 to 54 d. There was no significant correlation between protein turnover with increasing post-conceptional or post-natal age. There was considerable interindividual variation and reproducibility varied between different infants. We suggest that this is a convenient non-invasive technique for monitoring serially nitrogen and protein metabolism in infants and that as such it merits further assessment.