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Related Experiment Video

Updated: May 26, 2026

High-Efficiency Generation of Antigen-Specific Primary Mouse Cytotoxic T Cells for Functional Testing in an Autoimmune Diabetes Model
11:31

High-Efficiency Generation of Antigen-Specific Primary Mouse Cytotoxic T Cells for Functional Testing in an Autoimmune Diabetes Model

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Distributed Clonal Deletion Prevents Autoimmune Disease Progression.

Anna M Newen1, Uzair A Ansari1, Mikala J Simpson1

  • 1Experimental Immunology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health; Bethesda, MD 20892, USA.

Biorxiv : the Preprint Server for Biology
|May 25, 2026
PubMed
Summary

Distributed clonal deletion, involving mitochondrial apoptosis (MOMP) checkpoints, prevents autoimmune disease. Early checkpoints limit B cell diversification, while later ones restrict expanded autoreactive clones, preventing lethal disease.

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Area of Science:

  • Immunology
  • Cell Biology
  • Autoimmunity

Background:

  • Self-reactive B cells are generated during normal development.
  • Activation-induced cytidine deaminase (AID)-mediated diversification can increase B cell pathogenicity.
  • The precise role of clonal deletion in preventing autoimmune disease across developmental stages is unclear.

Purpose of the Study:

  • To investigate how clonal deletion is distributed across developmental and activation stages to prevent autoimmune disease.
  • To elucidate the role of temporally distinct mitochondrial apoptosis (MOMP) checkpoints in regulating autoreactive B cell fate.

Main Methods:

  • Utilized conditional Bcl-2 expression to inhibit MOMP at different stages (before or after B cell activation).
  • Analyzed the survival, maturation, and diversification of autoreactive B cells.
  • Assessed autoantibody production, antigen breadth, disease progression, and pathology.

Main Results:

  • Early MOMP inhibition allowed autoreactive B cell survival and maturation, leading to expanded antigen breadth autoantibodies and lethal, female-biased autoimmune disease.
  • Late MOMP inhibition resulted in restricted autoreactivity, limited pathology, and normal survival.
  • Early MOMP inhibition did not affect immature bone marrow B cells, indicating peripheral checkpoints.

Conclusions:

  • A Distributed Clonal Deletion Model is proposed, where early checkpoints restrict B cell diversification and later checkpoints limit the persistence of autoreactive clones.
  • Temporally distinct MOMP checkpoints differentially regulate autoreactive B cell fate and autoimmune disease progression.
  • Peripheral checkpoints are crucial for preventing autoimmune disease by controlling autoreactive B cells post-activation.