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ADP-ribosylation factor-like 8b is required for the development of mouse models of systemic lupus erythematosus.
International Immunology 2019 Februrary 8
Toll-like receptor (TLR) 7 and type I interferon (IFN-1) are essential for the development of systemic lupus erythematosus (SLE) models such as BXSB.Yaa and 2,6,10,14-tetramethyl-pentadecane (TMPD)-induced experimental lupus. However, the mechanism underlying the development of SLE remains undefined. We report a requirement for ADP-ribosylation factor-like 8b (Arl8b) for TLR7-dependent IFN-1 production in plasmacytoid dendritic cells (pDCs). We analyzed whether Arl8b plays a role in two SLE models by comparing wild-type and Arl8b-deficient Arl8b GeneTrap (Arl8bGt/Gt) mice. We found that BXSB.YaaArl8bGt/Gt mice showed none of the abnormalities characterized in BXSB.Yaa mice. TMPD treatment of Arl8bGt/Gt mice significantly inhibited the development of SLE. pDCs were required for TMPD-induced peritonitis. Our data demonstrate that Arl8b contributes to disease pathogenesis in two SLE models via IFN-1-dependent and-independent mechanisms and suggest that Arl8b is an attractive new target for therapeutic intervention in SLE.
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