Efficacy of a recombinant single-chain fragment variable region, VasSF, as a new drug for vasculitis.


Department of Research and Development, A-CLIP Institute, Ltd., Chiba, Japan, [Email]


UNASSIGNED : Anti-neutrophil cytoplasmic autoantibodies (ANCA) associated vasculitis is a pauci-immune disease with the inflammation of the small blood vessels. The efficacies of antibody drugs for induction therapies of vasculitis vary among cases. Here, we developed a novel clone of a single chain Fv region (ScFv) with vasculitis-specific therapeutic potential.
UNASSIGNED : The clone, termed VasSF, was selected from our Escherichia coli expression library of recombinant human ScFv based on the therapeutic efficacy in an SCG/Kj mouse model of MPO-ANCA-associated vasculitis (MAAV), such as improvement of the urinary score and decreased crescent formation in glomeruli, granulomatous in lung, MPO-ANCA biomarkers, the anti-moesin antibody, and some cytokine levels.
UNASSIGNED : We identified vasculitis-associated apolipoprotein A-II (VAP2) as a target molecule of the clone and confirmed the independently-established VAP2 antibodies were also therapeutic in SCG/Kj mice. In MAAV, MPO-ANCA and cytokines stimulate neutrophils by facilitating heterodimer formation of VAP2 with apolipoprotein A-I in HDL.
UNASSIGNED : VasSF would constitute a novel antibody drug for vasculitis by suppressing the heterodimer formation of the apolipoproteins.


ANCA antibody drug,HDL,MPO,SCG/Kj,VasSF,apolipoprotein,myeloperoxidase,vasculitis,

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