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Severe combined immune deficiency presenting with cyclic hematopoiesis
A K Junker1, M C Poon, D I Hoar
1Department of Paediatrics, University of British Columbia, Vancouver, Canada.
Journal of Clinical Immunology
|November 1, 1991
Summary
Cyclic hematopoiesis (CH) in an infant was linked to a severe immune deficiency. Bone marrow transplant successfully resolved both CH and immune dysfunction, suggesting a differentiation factor deficiency.
Area of Science:
- Pediatric Hematology
- Immunology
- Stem Cell Transplantation
Background:
- Cyclic hematopoiesis (CH) is a rare disorder characterized by periodic drops in blood cell counts.
- Immune deficiency has not been previously associated with human CH.
Observation:
- A 2-month-old male infant presented with cyclic symptoms including fever, aphthous ulcers, and lymphadenopathy, consistent with CH.
- The infant developed progressive hypogammaglobulinemia, progressing to agammaglobulinemia and severe combined immune deficiency (SCID).
- He experienced severe Pneumocystis carinii pneumonia at 8 months of age.
Findings:
- Bone marrow transplantation from an HLA-identical sibling, without preconditioning, led to resolution of CH and immune deficiency.
- Post-transplant analysis revealed donor lymphocytes and recipient erythrocytes and neutrophils.
- This suggests the hematopoietic stem cells were not intrinsically abnormal.
Implications:
- The findings suggest a potential primary deficiency in a differentiation factor crucial for lymphoid and myeloid progenitor cell maturation.
- This case expands the understanding of CH complications and highlights the potential for stem cell transplantation in treating associated immune deficiencies.
- Further research into differentiation factors may reveal novel therapeutic targets for related disorders.