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. 2011 Mar;41(3):595-601.
doi: 10.1002/eji.201041313. Epub 2011 Feb 10.

A20 deficiency in B cells enhances B-cell proliferation and results in the development of autoantibodies

Nadine Hövelmeyer  1 , Sonja Reissig, Nguyen Thi Xuan, Petra Adams-Quack, Dominika Lukas, Alexei Nikolaev, Dirk Schlüter, Ari Waisman
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Free article

A20 deficiency in B cells enhances B-cell proliferation and results in the development of autoantibodies

Nadine Hövelmeyer et al. Eur J Immunol. 2011 Mar.
Free article

Abstract

A20/TNFAIP3 is an ubiquitin-editing enzyme, important for the regulation of the NF-κB pathway. Mutations in the TNFAIP3 gene have been linked to different human autoimmune disorders. In human B-cell lymphomas, the inactivation of A20 results in constitutive NF-κB activation. Recent studies demonstrate that in mice the germline inactivation of A20 leads to early lethality, due to inflammation in multiple organs of the body. In this report, we describe a new mouse strain allowing for the tissue-specific deletion of A20. We show that B-cell-specific deletion of A20 results in a dramatic reduction in marginal zone B cells. Furthermore, A20-deficient B cells display a hyperactive phenotype represented by enhanced proliferation upon activation. Finally, these mice develop higher levels of serum immunoglobulins, resulting in an excessive production of self-reactive autoantibodies.

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