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Immunological abnormalities in children with acute rheumatic carditis and acute post-streptococcal glomerulonephritis
A Benatar1, D W Beatty, D G Human
1Department of Paediatrics and Child Health, University of Cape Town, South Africa.
Insights
Abnormal immune responses to streptococcal products may cause heart damage in children with acute rheumatic fever (ARF). Immunological changes seen in ARF were not observed in acute nephritis, supporting this hypothesis.
Area of Science:
- Pediatric Immunology
- Rheumatology
- Infectious Diseases
Background:
- Acute rheumatic fever (ARF) is an inflammatory disease that can cause significant heart damage (carditis).
- The exact cause of carditis in ARF remains under investigation, with a focus on immunological mechanisms.
- Distinguishing ARF from other conditions like acute nephritis is crucial for accurate diagnosis and treatment.
Purpose of the Study:
- To investigate immunological functions in children with ARF and acute nephritis.
- To elucidate the role of immune responses in the development of heart damage in ARF.
- To compare immunological profiles between ARF and acute nephritis patients.
Main Methods:
- Studied immunological functions in 10 children with ARF and 11 children with acute nephritis.
- Measured serum IgG, IgA, and antistreptococcal antibodies during the acute phase of ARF.
- Assessed lymphocyte transformation responses to phytohemagglutinin and streptococcal antigens.
- Analyzed T-cell subsets (T-helper, T-suppressor) in ARF patients.
Main Results:
- Children with ARF and carditis exhibited elevated serum IgG, IgA, and antistreptococcal antibodies.
- Lymphocyte responses to phytohemagglutinin and streptococcal antigens were suppressed in acute ARF, attributed to a serum suppressor effect.
- Post-recovery from ARF, patients showed lymphocytosis and enhanced lymphocyte response to streptococcal antigen.
- No significant changes in immunological responses were observed in children with acute nephritis.
- Observed changes in T-cell subsets in ARF were not statistically significant in this study.
Conclusions:
- Results support the hypothesis that an abnormal immune response to streptococcal products is implicated in ARF carditis.
- The distinct immunological profile in ARF, compared to acute nephritis, highlights a specific autoimmune or inflammatory process.
- Further research into streptococcal-triggered immune dysregulation is warranted for understanding and managing ARF.
Abstract:
Immunological functions were investigated in 10 children with acute rheumatic fever and 11 children with acute nephritis to try and elucidate the cause of heart damage in acute rheumatic fever. Children with acute rheumatic fever and carditis showed an increase in serum IgG, IgA and antistreptococcal antibodies during the acute stage. Lymphocyte transformation responses to phytohaemagglutinin and streptococcal antigens were reduced but this was due to a serum suppressor effect. After recovering from acute rheumatic fever a lymphocytosis and an increased lymphocyte blastogenic response to streptococcal antigen were found. T-cells, T-helper cells and T-suppressor cells showed some changes in acute rheumatic fever but these were not statistically significant in our study. None of the changes in immunological responses that were seen in acute rheumatic fever were found in acute nephritis. These results support the hypothesis that an abnormal immune response to streptococcal products is involved in the development of carditis and the other phenomena observed in acute rheumatic fever.