BOB.1 controls memory B-cell fate in the germinal center reaction

Maartje Levels 1, 2, 3 Cynthia Fehres 1, 2, 3 Lisa van Baarsen 1, 2, 3 Nathalie van Uden 1, 2, 3 Kristine Germar 1, 2, 3 Tom O'Toole 4 Iris Blijdorp 1, 2, 3 Johanna Semmelink 1, 2, 3 Marieke Doorenspleet 1, 2, 3 Arjen Bakker 5 Mikhail Krasavin 6 Alexey Tomilin 7 Sophie Brouard 8, * Hergen Spits 2 Dominique Baeten 1, 2, 3 Nataliya Yeremenko 1, 2, 3, *
* Corresponding author
1 Amsterdam UMC - Department of Rheumatology & Clinical Immunology [Amsterdam, the Netherlands]
2 Amsterdam UMC - Department of Experimental Immunology [Amsterdam, the Netherlands]
3 Amsterdam UMC - Amsterdam Rheumatology & Immunology Center - ARC [Amsterdam, the Netherlands]
4 Amsterdam UMC - Amsterdam Infection & Immunity Institute [Amsterdam, the Netherlands]
5 AIMM Therapeutics [Amsterdam, the Netherlands]
6 Saint Petersburg State University [Saint Petersburg, Russian Federation]
7 Institute of Cytology and Genetics
8 Team 4 - U1064 Inserm - CRTI - Immunoregulation And Immunointervention in Transplantation and Autoimmunity
U1064 Inserm - CRTI - Centre de Recherche en Transplantation et Immunologie
Abstract : During T cell-dependent (TD) germinal center (GC) responses, naïve B cells are instructed to differentiate towards GC B cells (GCBC), high-affinity long-lived plasma cells (LLPC) or memory B cells (Bmem). Alterations in the B cell-fate choice could contribute to immune dysregulation leading to the loss of self-tolerance and the initiation of autoimmune disease. Here we show that mRNA levels of the transcription regulator BOB.1 are increased in the lymph node compartment of patients with rheumatoid arthritis (RA), a prototypical auto-immune disease caused by the loss of immunological tolerance. Investigating to what extent levels of BOB.1 impact B cells during TD immune responses we found that BOB.1 has a crucial role in determining the B cell-fate decision. High BOB.1 levels promote the generation of cells with phenotypic and functional characteristics of Bmem. Mechanistically, overexpression of BOB.1 drives ABF1 and suppresses BCL6, favouring Bmem over LLPC or recycling GCBC. Low levels of BOB.1 are sufficient for LLPC but not for Bmem differentiation. Our findings demonstrate a novel role for BOB.1 in B cells during TD GC responses and suggest that its dysregulation may contribute to the pathogenesis of RA by disturbing the B cell-fate determination.
Keywords : Autoimmune disease Rheumatoid arthritis BOB.1 Germinal center B cell Memory B cell
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Maartje Levels, Cynthia Fehres, Lisa van Baarsen, Nathalie van Uden, Kristine Germar, et al.. BOB.1 controls memory B-cell fate in the germinal center reaction. Journal of Autoimmunity, Elsevier, 2019, Epub ahead of print. ⟨10.1016/j.jaut.2019.04.011⟩. ⟨inserm-02145823⟩

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