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Published in: Cancer Immunology, Immunotherapy 11/2012

01-11-2012 | Original article

Mechanism of resistance to trastuzumab and molecular sensitization via ADCC activation by exogenous expression of HER2-extracellular domain in human cancer cells

Authors: Ryosuke Yoshida, Hiroshi Tazawa, Yuuri Hashimoto, Shuya Yano, Teppei Onishi, Tsuyoshi Sasaki, Yasuhiro Shirakawa, Hiroyuki Kishimoto, Futoshi Uno, Masahiko Nishizaki, Shunsuke Kagawa, Toshiyoshi Fujiwara

Published in: Cancer Immunology, Immunotherapy | Issue 11/2012

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Abstract

Trastuzumab, a humanized antibody targeting HER2, exhibits remarkable therapeutic efficacy against HER2-positive breast and gastric cancers; however, acquired resistance presents a formidable obstacle to long-term tumor responses in the majority of patients. Here, we show the mechanism of resistance to trastuzumab in HER2-positive human cancer cells and explore the molecular sensitization by exogenous expression of HER2-extracellular domain (ECD) in HER2-negative or trastuzumab-resistant human cancer cells. We found that long-term exposure to trastuzumab induced resistance in HER2-positive cancer cells; HER2 expression was downregulated, and antibody-dependent cellular cytotoxicity (ADCC) activity was impaired. We next examined the hypothesis that trastuzumab-resistant cells could be re-sensitized by the transfer of non-functional HER2-ECD. Exogenous HER2-ECD expression induced by the stable transfection of a plasmid vector or infection with a replication-deficient adenovirus vector had no apparent effect on the signaling pathway, but strongly enhanced ADCC activity in low HER2-expressing or trastuzumab-resistant human cancer cells. Our data indicate that restoration of HER2-ECD expression sensitizes HER2-negative or HER2-downregulated human cancer cells to trastuzumab-mediated ADCC, an outcome that has important implications for the treatment of human cancers.
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Metadata
Title
Mechanism of resistance to trastuzumab and molecular sensitization via ADCC activation by exogenous expression of HER2-extracellular domain in human cancer cells
Authors
Ryosuke Yoshida
Hiroshi Tazawa
Yuuri Hashimoto
Shuya Yano
Teppei Onishi
Tsuyoshi Sasaki
Yasuhiro Shirakawa
Hiroyuki Kishimoto
Futoshi Uno
Masahiko Nishizaki
Shunsuke Kagawa
Toshiyoshi Fujiwara
Publication date
01-11-2012
Publisher
Springer-Verlag
Published in
Cancer Immunology, Immunotherapy / Issue 11/2012
Print ISSN: 0340-7004
Electronic ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-012-1249-x

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