Cutting edge: A threshold of B cell costimulatory signals is required for spontaneous germinal center formation in autoimmunity

Kristy Chiang, Andrea D. Largent, Tanvi Arkatkar, Christopher D. Thouvenel, Samuel W. Du, Natali Shumlak, Jonathan Woods, Quan Zhen Li, Yifan Liu, Baidong Hou, David J. Rawlings, Shaun W. Jackson

Research output: Contribution to journalArticlepeer-review

Abstract

Cognate interactions between autoreactive B and T cells promote systemic lupus erythematosus pathogenesis by inter alia facilitating spontaneous germinal center (GC) formation. Whereas both myeloid and B cell APCs express B7 ligands (CD80 and CD86), the prevailing model holds that dendritic cell costimulation is sufficient for CD28-dependent T cell activation. In this study, we report that B cell-intrinsic CD80/CD86 deletion unexpectedly abrogates GCs in murine lupus. Interestingly, absent GCs differentially impacted serum autoantibodies. In keeping with distinct extrafollicular and GC activation pathways driving lupus autoantibodies, lack of GCs correlated with loss of RNA-associated autoantibodies but preserved anti-dsDNA and connective tissue autoantibody titers. Strikingly, even heterozygous B cell CD80/CD86 deletion was sufficient to prevent autoimmune GCs and RNA-associated autoantibodies. Together, these findings identify a key mechanism whereby B cells promote lupus pathogenesis by providing a threshold of costimulatory signals required for autoreactive T cell activation.

Original languageEnglish (US)
Pages (from-to)2217-2222
Number of pages6
JournalJournal of Immunology
Volume207
Issue number9
DOIs
StatePublished - Nov 1 2021

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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