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- W2102893019 abstract "Abstract Rheumatoid arthritis (RA) is an inflammatory autoimmune joint disease in which the complement system plays an important role. Of the several components of complement, current evidence points to C5 as the most important inducer of inflammation. Several groups generated Abs or small interfering RNAs (siRNAs) or small molecule inhibitors against C5 and C5aR1 (CD88) that have showed some efficacy in RA in animal models. However, none of these candidate therapeutics has moved from bench to bedside. In this study, we test in collagen Ab-induced arthritis (CAIA) a new therapeutic strategy using a novel anti–C5ab-C5 siRNA conjugate. We first demonstrate that although C5aR2 or C5L2 (GPR77) plays no role in CAIA, C5aR1 contributes to pathogenesis. We demonstrate that injection of siRNAs blocking C5, C5aR1, or the combination decreased clinical disease activity in mice with CAIA by 45%, 51%, and 58%, respectively. Anti-C5 Ab (BB5.1) has only limited efficacy, but significantly reduced arthritis up to 66%. We then generated a novel anti-C5aR1 Ab–protamine–C5 siRNA conjugate. To our knowledge, we show for the first time that whereas unconjugated Ab plus siRNAs reduce arthritis by 19%, our anti-C5aR1 Ab–protamine–C5 siRNA conjugate was effective in reducing arthritis by 83% along with a parallel decrease in histopathology, C3 deposition, neutrophils, and macrophages in the joints of mice with CAIA. These data suggest that by targeting anti-C5 siRNAs to the receptor for its C5a activation fragment (C5aR1), a striking clinical effect can be realized." @default.
- W2102893019 created "2016-06-24" @default.
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- W2102893019 date "2015-06-01" @default.
- W2102893019 modified "2023-09-27" @default.
- W2102893019 title "A New Approach for the Treatment of Arthritis in Mice with a Novel Conjugate of an Anti-C5aR1 Antibody and C5 Small Interfering RNA" @default.
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- W2102893019 doi "https://doi.org/10.4049/jimmunol.1403012" @default.
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