Blockade of a key region in the extracellular domain inhibits HER2 dimerization and signaling

Autores
Menendez, Javier; Schroeder, Barbara; Peirce, Susan K.; Vellón, Luciano; Papadimitropoulou, Adriana; Espinoza, Ingrid; Lupu, Ruth
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Background: Several treatment strategies target the human epidermal growth factor receptor 2 (HER2) in breast carcinomas, including monoclonal antibodies directed against HER2?s extracellular domain (ECD) and small molecule inhibitors of its tyrosine kinase activity. Yet, novel therapies are needed that prevent HER2 dimerization with other HER family members, because current treatments are only partially effective. Methods: To test the hypothesis that HER2 activation requires a protein sequence in the HER2-ECD that mediates HER2 homo- and heterodimerization, we introduced a series of deletion mutations in the third subdomain of HER2-ECD. These deletion mutants were retrovirally expressed in breast cancer (BC) cells that naturally overexpress HER2 and in noncancerous, HER2-negative breast epithelial cells. One-factor analysis of variance or Student?s t test were used to analyze differences. All statistical tests were two-sided. Results: The smallest deletion in the ECD domain of HER2, which removed only 16 amino acids (HER2-ECDΔ451?466), completely disrupted the oncogenic potential of HER2. In contrast to wild-type HER2, the mutant-inhibited anchorage- independent growth (mean number of colonies: mutant, 70, 95% confidence interval [CI] = 55 to 85; wild-type, 400, 95% CI = 320 to 480, P < .001) increased sensitivity to paclitaxel treatment in both transformed and nontransformed cells. Overexpression of HER2Δ451?466 efficiently inhibited activation of HER1, HER2, and HER3 in all cell lines tested. Conclusions: These findings reveal that an essential ?activating? sequence exists in the extracellular domain of HER2. Disruption of this sequence disables the HER2 dimerization loop, blocks subsequent activation of HER2-driven oncogenic signaling, and generates a dominant-negative form of HER2. Reagents specifically against this molecular activation switch may represent a novel targeted approach for the management of HER2-overexpressing carcinomas.
Fil: Menendez, Javier. Instituto Catalán de Oncología; España
Fil: Schroeder, Barbara. Mayo Clinic Cancer Center; Estados Unidos
Fil: Peirce, Susan K.. Kateric CROC; Estados Unidos
Fil: Vellón, Luciano. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina
Fil: Papadimitropoulou, Adriana. Laboratory of Molecular Biology and Immunobiotechnology. Hellenic Pasteur Institute; Estados Unidos
Fil: Espinoza, Ingrid. Cancer Institute. University of Mississippi Medical Center; Estados Unidos
Fil: Lupu, Ruth. Mayo Clinic Cancer Center; Estados Unidos
Materia
Breast Carcinomas
Her2
Herceptin
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/3060

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network_name_str CONICET Digital (CONICET)
spelling Blockade of a key region in the extracellular domain inhibits HER2 dimerization and signalingMenendez, JavierSchroeder, BarbaraPeirce, Susan K.Vellón, LucianoPapadimitropoulou, AdrianaEspinoza, IngridLupu, RuthBreast CarcinomasHer2Herceptinhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Background: Several treatment strategies target the human epidermal growth factor receptor 2 (HER2) in breast carcinomas, including monoclonal antibodies directed against HER2?s extracellular domain (ECD) and small molecule inhibitors of its tyrosine kinase activity. Yet, novel therapies are needed that prevent HER2 dimerization with other HER family members, because current treatments are only partially effective. Methods: To test the hypothesis that HER2 activation requires a protein sequence in the HER2-ECD that mediates HER2 homo- and heterodimerization, we introduced a series of deletion mutations in the third subdomain of HER2-ECD. These deletion mutants were retrovirally expressed in breast cancer (BC) cells that naturally overexpress HER2 and in noncancerous, HER2-negative breast epithelial cells. One-factor analysis of variance or Student?s t test were used to analyze differences. All statistical tests were two-sided. Results: The smallest deletion in the ECD domain of HER2, which removed only 16 amino acids (HER2-ECDΔ451?466), completely disrupted the oncogenic potential of HER2. In contrast to wild-type HER2, the mutant-inhibited anchorage- independent growth (mean number of colonies: mutant, 70, 95% confidence interval [CI] = 55 to 85; wild-type, 400, 95% CI = 320 to 480, P < .001) increased sensitivity to paclitaxel treatment in both transformed and nontransformed cells. Overexpression of HER2Δ451?466 efficiently inhibited activation of HER1, HER2, and HER3 in all cell lines tested. Conclusions: These findings reveal that an essential ?activating? sequence exists in the extracellular domain of HER2. Disruption of this sequence disables the HER2 dimerization loop, blocks subsequent activation of HER2-driven oncogenic signaling, and generates a dominant-negative form of HER2. Reagents specifically against this molecular activation switch may represent a novel targeted approach for the management of HER2-overexpressing carcinomas.Fil: Menendez, Javier. Instituto Catalán de Oncología; EspañaFil: Schroeder, Barbara. Mayo Clinic Cancer Center; Estados UnidosFil: Peirce, Susan K.. Kateric CROC; Estados UnidosFil: Vellón, Luciano. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); ArgentinaFil: Papadimitropoulou, Adriana. Laboratory of Molecular Biology and Immunobiotechnology. Hellenic Pasteur Institute; Estados UnidosFil: Espinoza, Ingrid. Cancer Institute. University of Mississippi Medical Center; Estados UnidosFil: Lupu, Ruth. Mayo Clinic Cancer Center; Estados UnidosOxford Univ Press Inc2015-04-17info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/3060Menendez, Javier; Schroeder, Barbara; Peirce, Susan K.; Vellón, Luciano; Papadimitropoulou, Adriana; et al.; Blockade of a key region in the extracellular domain inhibits HER2 dimerization and signaling; Oxford Univ Press Inc; Journal Of The National Cancer Institute.; 107; 6; 17-4-2015; 1-110027-88741460-2105enginfo:eu-repo/semantics/altIdentifier/url/http://jnci.oxfordjournals.org/content/107/6/djv090.abstractinfo:eu-repo/semantics/altIdentifier/doi/doi:10.1093/jnci/djv090info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:11:47Zoai:ri.conicet.gov.ar:11336/3060instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:11:47.834CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Blockade of a key region in the extracellular domain inhibits HER2 dimerization and signaling
title Blockade of a key region in the extracellular domain inhibits HER2 dimerization and signaling
spellingShingle Blockade of a key region in the extracellular domain inhibits HER2 dimerization and signaling
Menendez, Javier
Breast Carcinomas
Her2
Herceptin
title_short Blockade of a key region in the extracellular domain inhibits HER2 dimerization and signaling
title_full Blockade of a key region in the extracellular domain inhibits HER2 dimerization and signaling
title_fullStr Blockade of a key region in the extracellular domain inhibits HER2 dimerization and signaling
title_full_unstemmed Blockade of a key region in the extracellular domain inhibits HER2 dimerization and signaling
title_sort Blockade of a key region in the extracellular domain inhibits HER2 dimerization and signaling
dc.creator.none.fl_str_mv Menendez, Javier
Schroeder, Barbara
Peirce, Susan K.
Vellón, Luciano
Papadimitropoulou, Adriana
Espinoza, Ingrid
Lupu, Ruth
author Menendez, Javier
author_facet Menendez, Javier
Schroeder, Barbara
Peirce, Susan K.
Vellón, Luciano
Papadimitropoulou, Adriana
Espinoza, Ingrid
Lupu, Ruth
author_role author
author2 Schroeder, Barbara
Peirce, Susan K.
Vellón, Luciano
Papadimitropoulou, Adriana
Espinoza, Ingrid
Lupu, Ruth
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Breast Carcinomas
Her2
Herceptin
topic Breast Carcinomas
Her2
Herceptin
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Background: Several treatment strategies target the human epidermal growth factor receptor 2 (HER2) in breast carcinomas, including monoclonal antibodies directed against HER2?s extracellular domain (ECD) and small molecule inhibitors of its tyrosine kinase activity. Yet, novel therapies are needed that prevent HER2 dimerization with other HER family members, because current treatments are only partially effective. Methods: To test the hypothesis that HER2 activation requires a protein sequence in the HER2-ECD that mediates HER2 homo- and heterodimerization, we introduced a series of deletion mutations in the third subdomain of HER2-ECD. These deletion mutants were retrovirally expressed in breast cancer (BC) cells that naturally overexpress HER2 and in noncancerous, HER2-negative breast epithelial cells. One-factor analysis of variance or Student?s t test were used to analyze differences. All statistical tests were two-sided. Results: The smallest deletion in the ECD domain of HER2, which removed only 16 amino acids (HER2-ECDΔ451?466), completely disrupted the oncogenic potential of HER2. In contrast to wild-type HER2, the mutant-inhibited anchorage- independent growth (mean number of colonies: mutant, 70, 95% confidence interval [CI] = 55 to 85; wild-type, 400, 95% CI = 320 to 480, P < .001) increased sensitivity to paclitaxel treatment in both transformed and nontransformed cells. Overexpression of HER2Δ451?466 efficiently inhibited activation of HER1, HER2, and HER3 in all cell lines tested. Conclusions: These findings reveal that an essential ?activating? sequence exists in the extracellular domain of HER2. Disruption of this sequence disables the HER2 dimerization loop, blocks subsequent activation of HER2-driven oncogenic signaling, and generates a dominant-negative form of HER2. Reagents specifically against this molecular activation switch may represent a novel targeted approach for the management of HER2-overexpressing carcinomas.
Fil: Menendez, Javier. Instituto Catalán de Oncología; España
Fil: Schroeder, Barbara. Mayo Clinic Cancer Center; Estados Unidos
Fil: Peirce, Susan K.. Kateric CROC; Estados Unidos
Fil: Vellón, Luciano. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina
Fil: Papadimitropoulou, Adriana. Laboratory of Molecular Biology and Immunobiotechnology. Hellenic Pasteur Institute; Estados Unidos
Fil: Espinoza, Ingrid. Cancer Institute. University of Mississippi Medical Center; Estados Unidos
Fil: Lupu, Ruth. Mayo Clinic Cancer Center; Estados Unidos
description Background: Several treatment strategies target the human epidermal growth factor receptor 2 (HER2) in breast carcinomas, including monoclonal antibodies directed against HER2?s extracellular domain (ECD) and small molecule inhibitors of its tyrosine kinase activity. Yet, novel therapies are needed that prevent HER2 dimerization with other HER family members, because current treatments are only partially effective. Methods: To test the hypothesis that HER2 activation requires a protein sequence in the HER2-ECD that mediates HER2 homo- and heterodimerization, we introduced a series of deletion mutations in the third subdomain of HER2-ECD. These deletion mutants were retrovirally expressed in breast cancer (BC) cells that naturally overexpress HER2 and in noncancerous, HER2-negative breast epithelial cells. One-factor analysis of variance or Student?s t test were used to analyze differences. All statistical tests were two-sided. Results: The smallest deletion in the ECD domain of HER2, which removed only 16 amino acids (HER2-ECDΔ451?466), completely disrupted the oncogenic potential of HER2. In contrast to wild-type HER2, the mutant-inhibited anchorage- independent growth (mean number of colonies: mutant, 70, 95% confidence interval [CI] = 55 to 85; wild-type, 400, 95% CI = 320 to 480, P < .001) increased sensitivity to paclitaxel treatment in both transformed and nontransformed cells. Overexpression of HER2Δ451?466 efficiently inhibited activation of HER1, HER2, and HER3 in all cell lines tested. Conclusions: These findings reveal that an essential ?activating? sequence exists in the extracellular domain of HER2. Disruption of this sequence disables the HER2 dimerization loop, blocks subsequent activation of HER2-driven oncogenic signaling, and generates a dominant-negative form of HER2. Reagents specifically against this molecular activation switch may represent a novel targeted approach for the management of HER2-overexpressing carcinomas.
publishDate 2015
dc.date.none.fl_str_mv 2015-04-17
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/3060
Menendez, Javier; Schroeder, Barbara; Peirce, Susan K.; Vellón, Luciano; Papadimitropoulou, Adriana; et al.; Blockade of a key region in the extracellular domain inhibits HER2 dimerization and signaling; Oxford Univ Press Inc; Journal Of The National Cancer Institute.; 107; 6; 17-4-2015; 1-11
0027-8874
1460-2105
url http://hdl.handle.net/11336/3060
identifier_str_mv Menendez, Javier; Schroeder, Barbara; Peirce, Susan K.; Vellón, Luciano; Papadimitropoulou, Adriana; et al.; Blockade of a key region in the extracellular domain inhibits HER2 dimerization and signaling; Oxford Univ Press Inc; Journal Of The National Cancer Institute.; 107; 6; 17-4-2015; 1-11
0027-8874
1460-2105
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://jnci.oxfordjournals.org/content/107/6/djv090.abstract
info:eu-repo/semantics/altIdentifier/doi/doi:10.1093/jnci/djv090
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Oxford Univ Press Inc
publisher.none.fl_str_mv Oxford Univ Press Inc
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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