Biomarkers for febrile urinary tract infection in children

Area of Science:

• Pediatric infectious diseases
• Clinical diagnostics
• Biomarker discovery

Background:

• Leukocyte esterase testing for urinary tract infection (UTI) diagnosis has suboptimal sensitivity and specificity.
• Recent research suggests novel protein markers may improve UTI diagnosis accuracy in children.

Purpose of the Study:

• To evaluate the diagnostic accuracy of specific urinary protein markers, including NGAL, CCL3, and IL-8, for identifying UTIs in children.
• To compare these markers against traditional diagnostic methods.

Main Methods:

• A prospective cross-sectional study involving 192 children.
• Urine samples were analyzed from febrile children with UTI, febrile controls without UTI, and healthy asymptomatic controls.
• Quantification of inflammatory proteins: CCL3, IL-8, CXCL1, TNF-alpha, IL-6, IFN-gamma, IL-17, IL-9, IL-2, and NGAL.

Main Results:

• Urinary NGAL, CCL3, and IL-8 levels were significantly higher in children with febrile UTI compared to controls.
• NGAL demonstrated a local bacteriostatic role via iron chelation.
• CCL3 and IL-8 are involved in leukocyte and neutrophil recruitment, respectively.
• These proteins were largely undetectable in asymptomatic children.

Conclusions:

• NGAL, CCL3, and IL-8 show potential as accurate biomarkers for the early diagnosis of pediatric UTIs.
• These markers may offer improved diagnostic capabilities over current methods.