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Article Abstract
C57BL/6 mice bearing the Sle2(z) lupus-susceptibility congenic interval on chromosome 4 display high titers of polyclonal autoantibodies with generalized B cell hyperactivity, hallmarks of systemic lupus erythematosus. In B6.Sle2(z)HEL(Ig).sHEL BCR-transgenic mice, Sle2(z) did not breach central tolerance, but it led to heightened expression of endogenous Ig H and L chains in splenic B cells, upregulation of RAG, and serological polyreactivity, suggestive of excessive receptor revision. Fatty acid amide hydrolase (FAAH), a gene in the minimal subcongenic interval generated through recombinant mapping, was found to be upregulated in Sle2(z) B cells by microarray analysis, Western blot, and functional assays. Pharmacological inhibition of FAAH reversed the increase in receptor revision, RAG expression, and polyreactive autoantibodies in lupus-prone mice. These studies indicate that increased peripheral BCR revision, or selective peripheral expansion of BCR-revised B cells, may lead to systemic autoimmunity and that FAAH is a lupus-susceptibility gene that might regulate this process.
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| http://dx.doi.org/10.4049/jimmunol.1500291 | DOI Listing |
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