Differences in Urine Protein Profiles between Preterm and Full-Term Infants Based on Urine Proteomic Analysis

Area of Science:

• Nephrology
• Proteomics
• Infant Health

Background:

• Preterm birth is a significant risk factor for developing chronic kidney disease (CKD).
• Urine analysis can offer insights into renal conditions and potential CKD mechanisms.
• Understanding the urine proteome in preterm infants is crucial for early risk assessment.

Purpose of the Study:

• To investigate differences in urine protein profiles between preterm and full-term infants.
• To identify potential urinary biomarkers associated with the increased risk of CKD in preterm infants.
• To explore the underlying mechanisms linking prematurity to long-term renal dysfunction.

Main Methods:

• Urine samples collected from preterm infants (gestational age <28 weeks) and full-term infants.
• Liquid chromatography-tandem mass spectrometry (LC-MS/MS) for urine proteome analysis.
• Bioinformatics analysis to identify differentially expressed proteins, validated by ELISA (e.g., CDH6, CDH11).

Main Results:

• Identified 2,634 proteins; 366 highly expressed in preterm infants, 102 in full-term infants.
• Proteins in preterm infants' urine implicated in structure organization and cell adhesion.
• Proteins in full-term infants' urine linked to immune response; kidney cells observed in preterm infants' urine.
• CDH6 and CDH11 validated as more abundant in preterm infants' urine.

Conclusions:

• Significant differences exist in urine protein profiles between preterm and full-term infants.
• The study provides a potential new explanation for the high risk of CKD development following preterm birth.
• Urinary proteomic analysis may aid in identifying infants at risk for long-term renal complications.