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The Human Thymus Is Enriched for Autoreactive B Cells
Magdalena B Rother1, Marco W J Schreurs1, Roel Kroek1
1Department of Immunology, Erasmus Medical Center, University Medical Center Rotterdam, 3000 DR Rotterdam, the Netherlands; and.
Thymic B cells, crucial for T cell development, are primarily mature and autoreactive, presenting autoantigens to T cell progenitors during negative selection.
Area of Science:
- Immunology
- Cell Biology
Background:
- B cells reside in the human thymus and may present autoantigens.
- Limited data exists on thymic B cell immunoglobulin (Ig) gene repertoires and autoantigen reactivity.
Purpose of the Study:
- To investigate the Ig gene repertoires and autoantigen reactivity of B cells from pediatric thymus.
- To compare thymic B cells with mature B cells from fetal and pediatric bone marrow.
Main Methods:
- Single-cell sorting of B cells from pediatric thymus, fetal bone marrow, and pediatric bone marrow.
- Analysis of Ig gene repertoires.
- Assessment of autoantigen reactivity.
Main Results:
- Thymic B cells are predominantly mature, with Ig gene repertoires similar to pediatric bone marrow.
- Fetal B cells showed high reactivity to dsDNA.
- Thymic B cells exhibited enrichment for autoreactive clones, particularly against peptide autoantigens.
Conclusions:
- Most B cells in the thymus are resident, not developing.
- Thymic B cells are enriched for autoantigen binding, supporting their role in T cell negative selection.
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