MAbs. 2018 Mar 01; doi: 10.1080/19420862.2018.1445451

Janna Bednenko, Rian Harriman, Lore Mariën, Hai M. Nguyen, Alka Agrawal, Ashot Papoyan, Yelena Bisharyan, Joanna Cardarelli, Donna Cassidy-Hanley, Ted Clark, Darlene Pedersen, Yasmina Abdiche, William Harriman, Bas van der Woning, Hans de Haard, Ellen Collarini, Heike Wulff, Paul Colussi

Abstract
Identifying monoclonal antibodies that block human voltage-gated ion channels (VGICs) is a challenging endeavor exacerbated by difficulties in producing recombinant ion channel proteins in amounts that support drug discovery programs. We have developed a general strategy to address this challenge by combining high-level expression of recombinant VGICs in Tetrahymena thermophila with immunization of phylogenetically diverse species and unique screening tools that allow deep-mining for antibodies that could potentially bind functionally important regions of the protein. Using this approach, we targeted human Kv1.3, a voltage-gated potassium channel widely recognized as a therapeutic target for the treatment of a variety of T-cell mediated autoimmune diseases. Recombinant Kv1.3 was used to generate and recover 69 full-length anti-Kv1.3 mAbs from immunized chickens and llamas, of which 10 were able to inhibit Kv1.3 current. Select antibodies were shown to be potent (IC50<10nM) and specific for Kv1.3 over related Kv1 family members, hERG and hNav1.5.

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