Deleting the BAFF receptor TACI protects against systemic lupus erythematosus without extensive reduction of B cell numbers

作者：Figgett William A; Deliyanti Devy; Fairfax Kirsten A; Quah Pin Shie; Wilkinson Berka Jennifer L; Mackay Fabienne^*

来源：Journal of Autoimmunity, 2015, 61: 9-16.

DOI：10.1016/j.jaut.2015.04.007

• BAFF
• Systemic lupus erythematosus
• TACI
• TLR7
• Autoantibodies
• Lupus nephritis

B cell-activating factor of the TNF family (BAFF) is an essential B cell survival factor. However, high levels of BAFF promote systemic lupus erythematosus (SLE) in mice and humans. Belimumab (anti-human BAFF) limits B cell survival and is approved for use in patients with SLE. Surprisingly, the efficacy of rituximab (anti-human CD20) in SLE remains controversial, despite depleting B cells more potently than belimumab. This raises the question of whether B cell depletion is really the mechanism of action of belimumab. In BAFF transgenic mice, SLE development is T cell-independent but relies on innate activation of B cells via TLRs, and TLR expression is modulated by the BAFF receptor TACI. Here, we show that loss of TACI on B cells protected against BAFF-mediated autoimmune manifestations while preserving B cells, suggesting that loss of BAFF signaling through TACI rather than loss of B cells may underpin the effect of belimumab in the clinic. Therefore, B cell-sparing blockade of TACI may offer a more specific and safer therapeutic alternative to broad B cell depletion in SLE.

• 出版日期2015-7
• 单位河北医科大学