Secretory IgA in urinary tract infections

Area of Science:

• Immunology
• Pediatrics
• Urology

Background:

• Recurrent urinary tract infections (UTIs) are common in children.
• The role of specific immunoglobulins in non-obstructive UTIs requires further elucidation.

Purpose of the Study:

• To compare urinary secretory IgA (sIgA) levels in children with chronic/recurrent non-obstructive UTIs versus healthy children.
• To investigate the local production of sIgA in the bladder.

Main Methods:

• Radial immunodiffusion was used to measure sIgA in urine samples.
• Levels of IgA, IgG, and IgM were also quantified.
• Comparison was made between infected and normal pediatric groups.

Main Results:

• Absent or low sIgA levels were observed in both infected and normal children.
• Mean urinary sIgA levels were significantly higher in the infected group (3.3 mg/24 hours) compared to the normal group (0.78 mg/24 hours).
• Evidence suggests secretory IgA is produced locally within the bladder.

Conclusions:

• Elevated urinary secretory IgA levels in children may serve as an indicator of an antibody response to urinary tract infections.
• Local bladder production of sIgA is implicated in the immune response to UTIs.