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Recurrence of acute poststreptococcal glomerulonephritis
1Department of Pediatrics, Niigata City General Hospital, Niigata, Japan. twata@hosp.niigata.niigata.jp
Pediatric Nephrology (Berlin, Germany)
|July 24, 2001
Summary
Recurrence of acute poststreptococcal glomerulonephritis (APSGN) is rare. This case suggests APSGN may recur in patients lacking a natural immune response to the nephritis-associated plasmin receptor protein (NAP1r).
Area of Science:
- Nephrology
- Immunology
- Microbiology
Background:
- Acute poststreptococcal glomerulonephritis (APSGN) is a kidney inflammation typically following a streptococcal infection.
- Recurrence of APSGN is uncommon, with limited understanding of underlying mechanisms.
Observation:
- An 8-year-old boy experienced a second episode of APSGN 12 months after full recovery from the first.
- Renal biopsy during the second episode revealed characteristic APSGN histological findings.
- The nephritis-associated plasmin receptor protein (NAP1r), a newly identified pathogenic antigen in APSGN, was detected in kidney tissue.
Findings:
- Despite NAP1r detection in the glomeruli, the patient lacked detectable antibodies against it in serum.
- Histology showed diffuse endocapillary proliferation and immune complex deposition (C3, IgG, IgA, fibrinogen).
Implications:
- This case highlights a potential mechanism for APSGN recurrence: an absent natural immune response to the NAP1r antigen.
- Further research into immune responses to NAP1r may offer insights into preventing or managing recurrent APSGN.