Characterization of antihuman IFNAR-1 monoclonal antibodies: Epitope localization and functional analysis

Lisa A. Goldman, Mohammad Zafari, Elizabeth Cali Cutrone, Anju Dang, Margot Brickelmeier, Laura Runkel, Christopher D. Benjamin, Leona E. Ling, Jerome A. Langer

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

The type I interferon receptor (IFNAR) is composed of two subunits, IFNAR-1 and IFNAR-2, encoding transmembrane polypeptides. IFNAR-2 has a dominant role in ligand binding, but IFNAR-1 contributes to binding affinity and to differential ligand recognition. A panel of five monoclonal antibodies (mAb) to human IFNAR-1 (HuIFNAR-1) was produced and characterized. The reactivity of each mAb toward HuIFNAR-1 on native and transfected cells and in Western blot and ELISA formats was determined. In functional assays, one mAb, EA12, blocked IFN-α2 binding to human cells and interfered with Stat activation and antiviral activity. Epitopes for the mAb were localized to subdomains of the HuIFNAR-1 extracellular domain by differential reactivity of the mAb to a series of human/bovine IFNAR-1 chimeras. The antibody EA12 seems to require native HuIFNAR-1 for reactivity and does not map to a single subdomain, perhaps recognizing an epitope containing noncontiguous sequences in at least two subdomains. In contrast, the epitopes of the nonneutralizing mAb FB2, AA3, and GB8 mapped, respectively, to the first, second, and third subdomains of HuIFNAR-1. The mAb DB2 primarily maps to the fourth subdomain, although its reactivity may be affected by other determinants.

Original languageEnglish (US)
Pages (from-to)15-26
Number of pages12
JournalJournal of Interferon and Cytokine Research
Volume19
Issue number1
DOIs
StatePublished - 1999

All Science Journal Classification (ASJC) codes

  • Immunology
  • Cell Biology
  • Virology

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