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SLAP deficiency decreases dsDNA autoantibody production #MMPMID24440645
Peterson LK; Pennington LF; Shaw LA; Brown M; Treacy EC; Friend SF; Hatlevik Ø; Rubtsova K; Rubtsov AV; Dragone LL
Clin Immunol 2014[Feb]; 150 (2): 201-9 PMID24440645show ga
Src-like adaptor protein (SLAP) adapts c-Cbl, an E3 ubiquitin ligase, to activated components of the BCR signaling complex regulating BCR levels and signaling in developing B cells. Based on this function, we asked whether SLAP deficiency could decrease the threshold for tolerance and eliminate development of autoreactive B cells in two models of autoantibody production. First, we sensitized mice with a dsDNA mimetope that causes an anti-dsDNA response. Despite equivalent production of anti-peptide antibodies compared to BALB/c controls, SLAP?/? mice did not produce anti-dsDNA. Second, we used the 56R tolerance model. SLAP?/? 56R mice had decreased levels of dsDNA-reactive antibodies compared to 56R mice due to skewed light chain usage. Thus, SLAP is a critical regulator of B-cell development and function and its deficiency leads to decreased autoreactive B cells that are otherwise maintained by inefficient receptor editing or failed negative selection.