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2015 ; 195
(6
): 2571-9
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B Cell-Specific MHC Class II Deletion Reveals Multiple Nonredundant Roles for B
Cell Antigen Presentation in Murine Lupus
#MMPMID26268653
Giles JR
; Kashgarian M
; Koni PA
; Shlomchik MJ
J Immunol
2015[Sep]; 195
(6
): 2571-9
PMID26268653
show ga
B cells have both Ab-dependent and Ab-independent functions in systemic
autoimmune diseases, including systemic lupus erythematosus (SLE). Ab-independent
functions are known to be important, because mice with B cells but no secreted Ig
have severe disease. These functions could include roles in lymphoid development,
cytokine secretion, and Ag presentation; however, these possibilities have not
been directly tested in SLE models. In this study, we show by lineage-specific
ablation of MHC class II (MHCII) that B cell Ag presentation plays a nonredundant
role in CD4(+) T cell activation and effector differentiation in the MRL.Fas(lpr)
mouse model of SLE. MHCII-mediated interactions between B and T cells further
promote B cell proliferation and differentiation, and, in fact, inefficient MHCII
deletion on B cells led to strong selection of escaped cells in activated and
plasmablast compartments, further underscoring the central role of B cell Ag
presentation. Despite the leakiness in the system, B cell-specific MHCII deletion
resulted in substantially ameliorated clinical disease. Hence, B cell Ag
presentation is critical for T and B cell activation and differentiation, as well
as target organ damage.