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Serum Immunoglobulin Levels in Children with Sickle Cell Disease: A Large Prospective Study
Sophia Cherif-Alami1, Isabelle Hau2, Cécile Arnaud3
1Service de Pédiatrie, Centre de Référence de la Drépanocytose, Centre Hospitalier Intercommunal de Créteil, 40 Avenue de Verdun, 94000 Créteil, France. sophia.cherif-alami@chu-dijon.fr.
Insights
Children with severe sickle cell disease (SCD) show higher immunoglobulin A (IgA) and G (IgG) levels than those with milder SCD. Hydroxyurea treatment increased IgA and IgG, while transfusions stabilized them.
Area of Science:
- Pediatric Hematology
- Immunology
- Sickle Cell Disease Research
Background:
- Sickle cell disease (SCD) is a genetic blood disorder affecting hemoglobin.
- Immunoglobulin (Ig) levels can be altered in various chronic diseases.
- Understanding Ig dynamics in pediatric SCD is crucial for patient management.
Purpose of the Study:
- To prospectively evaluate immunoglobulin levels in a large cohort of children with SCD.
- To investigate the impact of sickle cell genotype on Ig levels.
- To assess the effect of hydroxyurea and transfusion therapies on Ig levels.
Main Methods:
- Prospective evaluation of 888 children with SCD over 3 decades.
- Stratification of patients based on severe (HbSS, HbSβ0) and milder (HbSC, HbSβ+) genotypes.
- Analysis of serum immunoglobulin (IgG, IgA, IgM) levels.
Main Results:
- Consistent differences in IgG and IgA levels between severe and milder SCD genotypes observed from childhood to adolescence.
- Elevated IgA and IgG levels in severe SCD genotypes compared to milder ones.
- Low serum IgM levels were consistent across all SCD genotypes.
- Hydroxyurea therapy significantly increased IgA and IgG levels.
- Transfusion programs stabilized IgA and IgG levels.
Conclusions:
- Sickle cell genotype significantly influences IgG and IgA levels in children with SCD.
- Therapeutic interventions like hydroxyurea and transfusions differentially affect Ig levels.
- Further research is needed to elucidate the mechanisms and clinical significance of these Ig alterations in pediatric SCD.
Abstract:
Over the past 3 decades, the pediatric department of the university Intercommunal Créteil hospital, a referral center for sickle cell disease (SCD), has prospectively evaluated immunoglobulin (Ig) levels in a cohort of 888 children with SCD, including 731 with severe sickle genotypes (HbSS and HbSβ0 thalassemia) and 157 with milder genotypes (HbSC and HbSβ+ thalassemia). We found consistent sickle genotype differences in levels of IgG and IgA, with increased levels of IgA and IgG in the severe versus milder genotype, from early childhood to late adolescence. Additionally, our results revealed a low serum IgM level, irrespective of sickle genotype. Finally, we found that IgA and IgG levels were significantly increased after therapeutic intensification with hydroxyurea but were stabilized in children receiving a transfusion program. The mechanisms contributing to these changes in Ig levels are unclear as is their clinical significance. We believe they should be further investigated.
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