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Molecular pattern recognition in peripheral B cell tolerance: lessons from age-associated B cells.

John L Johnson1, Jean L Scholz1, Ann Marshak-Rothstein2

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Mechanisms controlling self-reactive B cells in adults are unclear. Toll-like receptor 9 (TLR9) signals, not B cell receptor specificity, dictate whether B cells differentiate into Age-associated B cells (ABC) or undergo cell death, impacting autoimmunity.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Autoimmunity

Background:

  • Central tolerance mechanisms eliminate self-reactive B cells during development.
  • Peripheral tolerance mechanisms preventing autoreactive B cell differentiation from mature pools are not well understood.
  • Nucleic acid-sensing Toll-like receptors (TLRs), particularly TLR9, are implicated in autoimmunity and peripheral tolerance.

Purpose of the Study:

  • To investigate the role of TLR9 signaling in the differentiation of autoreactive B cells.
  • To understand the mechanisms governing the expansion of Age-associated B cells (ABC) in aging and autoimmunity.
  • To determine whether B cell receptor (BCR) epitope specificity or molecular pattern recognition mediates tolerogenic outcomes.

Main Methods:

  • Analysis of B cell populations during aging and in autoimmune settings.
  • Investigating the impact of TLR9 signals on B cell differentiation.
  • Examining the interplay between BCR signaling, costimulation, and TLR9 in B cell fate determination.

Main Results:

  • Age-associated B cells (ABC) expand during aging and in autoimmune conditions.
  • TLR9 signals can direct activated B cells towards an ABC phenotype.
  • BCR-delivered TLR9 signals induce cell death, but costimulation can override this, promoting ABC differentiation.
  • Molecular pattern recognition by TLR9, rather than BCR epitope specificity, appears crucial for peripheral B cell tolerance.

Conclusions:

  • TLR9 signaling plays a critical role in regulating the differentiation of mature B cells, influencing the development of autoimmunity.
  • The balance between TLR9-mediated cell death and costimulation determines the fate of activated B cells, impacting ABC expansion.
  • Peripheral B cell tolerance is fundamentally mediated by molecular pattern recognition pathways, not solely by BCR epitope specificity.