Recombinant dimeric IgA antibodies against the epidermal growth factor receptor mediate effective tumor cell killing

Stefan Lohse, Stefanie Derer, Thomas Beyer, Katja Klausz, Matthias Peipp, Jeanette H.W. Leusen, Jan G.J. Van De Winkel, Michael Dechant, Thomas Valerius*

*Corresponding author for this work
45 Citations (Scopus)


Dimeric IgA Abs contribute significantly to the humoral part of the mucosal immune system. However, their potential as immunotherapeutic agent has hardly been explored. In this article, we describe the production, purification, and functional evaluation of recombinant dimeric IgA against the epidermal growth factor receptor. Human joining chain-containing IgAwas produced by non-adherent Chinese hamster ovarian (CHO)-K1 cells under serum-free conditions. Purification by anti-human κ and anti-His-tag affinity, as well as size exclusion chromatography, resulted in a homogenous preparation of highly pure IgA dimers. Functional studies demonstrated dimeric IgA to be at least as effective as monomeric IgA in triggering Ab-dependent cellular cytotoxicity by isolated monocytes or polymorphonuclear cell and in human whole-blood assays. Importantly, dimeric IgA was more effective in F(ab)-mediated killing mechanisms, such as inhibition of ligand binding, receptor downmodulation, and growth inhibition. Furthermore, only dimeric but not monomeric IgA or IgG was directionally transported by the polymeric Ig receptor through an epithelial cell monolayer. Together, these studies demonstrate that recombinant dimeric IgA Abs recruit a distinct repertoire of effector functions compared with monomeric IgA or IgG1 Abs.

Original languageEnglish
JournalJournal of Immunology
Issue number6
Pages (from-to)3770-3778
Number of pages9
Publication statusPublished - 15.03.2011

Research Areas and Centers

  • Academic Focus: Center for Brain, Behavior and Metabolism (CBBM)


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