Characterisation of anifrolumab, a fully human anti-interferon receptor antagonist antibody for the treatment of systemic lupus erythematosus

作者：Jeffrey M. Riggs, Richard N. Hanna, Bhargavi Rajan, Kamelia Zerrouki, Jodi L. Karnell, Divya Sagar, Inna Vainshtein, Erika Farmer, Kimberly Rosenthal, Chris Morehouse, Melissa de los Reyes, Kevin P. Schifferli, Meina Liang, Miguel A. F. Sanjuán, Gary P. Sims, Roland Kolbeck · 发表于：Lupus Science & Medicine · 年份：2018 · DOI：10.1136/lupus-2018-000261 · 被引用次数：153 · 研究领域：Systemic Lupus Erythematosus Research、Rheumatoid Arthritis Research and Therapies、Multiple Sclerosis Research Studies

OBJECTIVE: We investigated the mechanistic and pharmacological properties of anifrolumab, a fully human, effector-null, anti-type I interferon (IFN) alpha receptor 1 (IFNAR1) monoclonal antibody in development for SLE. METHODS: IFNAR1 surface expression and internalisation on human monocytes before and after exposure to anifrolumab were assessed using confocal microscopy and flow cytometry. The effects of anifrolumab on type I IFN pathway activation were assessed using signal transducer and activator of transcription 1 (STAT1) phosphorylation, IFN-stimulated response element-luciferase reporter cell assays and type I IFN gene signature induction. The ability of anifrolumab to inhibit plasmacytoid dendritic cell (pDC) function and plasma cell differentiation was assessed by flow cytometry and ELISA. Effector-null properties of anifrolumab were assessed in antibody-dependent cell-mediated cytotoxicity (ADCC) and complement-dependent cytotoxicity (CDC) assays with B cells. RESULTS: Anifrolumab reduced cell surface IFNAR1 by eliciting IFNAR1 internalisation. Anifrolumab blocked type I IFN-dependent STAT1 phosphorylation and IFN-dependent signalling induced by recombinant and pDC-derived type I IFNs and serum of patients with SLE. Anifrolumab suppressed type I IFN production by blocking the type I IFN autoamplification loop and inhibited proinflammatory cytokine induction and the upregulation of costimulatory molecules on stimulated pDCs. Blockade of IFNAR1 suppressed plasma cell ...