Unbiased Combinatorial Screening Identifies a Bispecific IgG1 that Potently Inhibits HER3 Signaling via HER2-Guided Ligand Blockade

Cecile A.W. Geuijen, Camilla De Nardis, David Maussang, Eric Rovers, Tristan Gallenne, Linda J.A. Hendriks, Therese Visser, Roy Nijhuis, Ton Logtenberg, John de Kruif, Piet Gros, Mark Throsby*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

HER2-driven cancers require phosphatidylinositide-3 kinase (PI3K)/Akt signaling through HER3 to promote tumor growth and survival. The therapeutic benefit of HER2-targeting agents, which depend on PI3K/Akt inhibition, can be overcome by hyperactivation of the heregulin (HRG)/HER3 pathway. Here we describe an unbiased phenotypic combinatorial screening approach to identify a bispecific immunoglobulin G1 (IgG1) antibody against HER2 and HER3. In tumor models resistant to HER2-targeting agents, the bispecific IgG1 potently inhibits the HRG/HER3 pathway and downstream PI3K/Akt signaling via a “dock & block” mechanism. This bispecific IgG1 is a potentially effective therapy for breast cancer and other tumors with hyperactivated HRG/HER3 signaling. Geuijen et al. identify a bispecific IgG1 antibody against HER2 and HER3 using a phenotypic combinatorial screening approach. This antibody potently inhibits the heregulin/HER3 pathway and downstream PI3K/Akt signaling via a “dock & block” mechanism in tumor models resistant to agents targeting HER2.

Original languageEnglish
Pages (from-to)922-936.e10
JournalCancer Cell
Volume33
Issue number5
DOIs
Publication statusPublished - 14 May 2018
Externally publishedYes

Keywords

  • bispecific antibody
  • cancer
  • HER2
  • HER3
  • heregulin
  • MCLA-128
  • NRG1
  • PB4188
  • PI3K/Akt
  • zenocutuzumab

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