Journal
JOURNAL OF AUTOIMMUNITY
Volume 62, Issue -, Pages 81-92Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jaut.2015.06.003
Keywords
B cells; Germinal center; Autoimmunity; Primary immunodeficiency; Wiskott-Aldrich syndrome; N-WASp
Categories
Funding
- Karolinska Institutet
- Fundacao para a Ciencia e a Tecnologia
- Swedish Cancer Society
- Queen Silvia foundation
- Erik and Edith Fernstrom foundation
- Swedish Society for Medical Research
- Swedish Research Council
- Childhood cancer foundation
- European Commission [249177]
- Jeansson Foundation
- Clas Groschinsky Foundation
- Ake Wiberg Foundation
- Bergvall Foundation
- Swedish Society of Medicine
- Center for Allergy Research
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Humoral immunodeficiency caused by mutations in the Wiskott-Aldrich syndrome protein (WASp) is associated with failure to respond to common pathogens and high frequency of autoimmunity. Here we addressed the question how deficiency in WASp and the homologous protein N-WASP skews the immune response towards autoreactivity. Mice devoid of WASp or both WASp and N-WASp in B cells formed germinal center to increased load of apoptotic cells as a source of autoantigens. However, the germinal centers showed abolished polarity and B cells retained longer and proliferated less in the germinal centers. While WASp-deficient mice had high titers of autoreactive IgG, B cells devoid of both WASp and N-WASp produced mainly IgM autoantibodies with broad reactivity to autoantigens. Moreover, B cells lacking both WASp and N-WASP induced somatic hypermutation at reduced frequency. Despite this, IgG1-expressing B cells devoid of WASP and N-WASp acquired a specific high affinity mutation, implying an increased BCR signaling threshold for selection in germinal centers. Our data provides evidence for that N-WASp expression alone drives WASp-deficient B cells towards autoimmunity. (C) 2015 Elsevier Ltd. All rights reserved.
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