Abstract
We investigated potential therapeutic effects of a conjugate of BAFF receptor specific-monoclonal antibody and short interference RNA in a mouse model of myasthenia gravis (EAMG). Whereas high-dose siRNA conjugate resulted in significant accumulation of Fas expressing CD19+/B220+ cells and concurrent expression of type 1 interferon in lymph nodes, low-dose conjugate did not induce FAS expression but caused marked BAFF receptor deficiency in lymph nodes that was further associated with improved MG symptoms. Unexpectedly, despite inhibiting BAFF receptor significantly in PBMCs and secondary lymphoid organs, conjugate treatment did not reduce the levels of autoantibody. Rather, at high dose, it caused robust increase in high affinity anti-AChR antibody and increased levels of serum IL10 and IL-4 cytokines. Our findings reveal a previously undocumented, dose dependent, immunomodulatory distant effect resulting from BAFF receptor specific mAb-siRNA conjugate treatment in an in vivo model of autoimmune disease.
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