Heregulin induces transcriptional activation of the progesterone receptor by a mechanism that requires functional ErbB-2 and mitogen-activated protein kinase activation in breast cancer cells
The present study addresses the capacity of heregulin (HRG), a ligand of type I receptor tyrosine kinases, to transactivate the progesterone receptor (PR). For this purpose, we studied, on the one hand, an experimental model of hormonal carcinogenesis in which the synthetic progestin medroxyprogeste...
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2003
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02707306_v23_n3_p1095_Labriola http://hdl.handle.net/20.500.12110/paper_02707306_v23_n3_p1095_Labriola |
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paper:paper_02707306_v23_n3_p1095_Labriola2023-06-08T15:24:55Z Heregulin induces transcriptional activation of the progesterone receptor by a mechanism that requires functional ErbB-2 and mitogen-activated protein kinase activation in breast cancer cells 2 (2 amino 3 methoxyphenyl)chromone antisense oligodeoxynucleotide epidermal growth factor receptor 2 gestagen medroxyprogesterone acetate mifepristone mitogen activated protein kinase mitogen activated protein kinase 1 neu differentiation factor progesterone progesterone receptor protein tyrosine kinase receptor unclassified drug animal cell article autoradiography binding site breast adenocarcinoma breast cancer cancer cell culture carcinogenesis cell nucleus controlled study DNA protein complex down regulation enzyme activation enzyme activity genetic transfection molecular mechanics mouse nonhuman priority journal protein expression protein phosphorylation transactivation transcription initiation Animals Breast Neoplasms Cell Division Cell Nucleus Enzyme Inhibitors Female Flavonoids Genes, erbB-2 Hormone Antagonists Humans Mammary Neoplasms, Experimental Mice Mice, Inbred BALB C Mifepristone Mitogen-Activated Protein Kinases Neuregulin-1 Phosphorylation Receptor, erbB-2 Receptors, Progesterone RNA, Messenger RNA, Neoplasm Trans-Activation (Genetics) Tumor Cells, Cultured Animalia Eukaryota Felis catus Murinae The present study addresses the capacity of heregulin (HRG), a ligand of type I receptor tyrosine kinases, to transactivate the progesterone receptor (PR). For this purpose, we studied, on the one hand, an experimental model of hormonal carcinogenesis in which the synthetic progestin medroxyprogesterone acetate (MPA) induced mammary adenocarcinomas in female BALB/c mice and, on the other hand, the human breast cancer cell line T47D. HRG was able to exquisitely regulate biochemical attributes of PR in a way that mimicked PR activation by progestins. Thus, HRG treatment of primary cultures of epithelial cells of the progestin-dependent C4HD murine mammary tumor line and of T47D cells induced a decrease of protein levels of PRA and -B isoforms and the downregulation of progesterone-binding sites. HRG also promoted a significant increase in the percentage of PR localized in the nucleus in both cell types. DNA mobility shift assay revealed that HRG was able to induce PR binding to a progesterone response element (PRE) in C4HD and T47D cells. Transient transfections of C4HD and T47D cells with a plasmid containing a PRE upstream of a chloramphenicol acetyltransferase (CAT) gene demonstrated that HRG promoted a significant increase in CAT activity. In order to assess the molecular mechanisms underlying PR transactivation by HRG, we blocked ErbB-2 expression in C4HD and T47D cells by using antisense oligodeoxynucleotides to ErbB-2 mRNA, which resulted in the abolishment of HRG's capacity to induce PR binding to a PRE, as well as CAT activity in the transient-transfection assays. Although the inhibition of HRG binding to ErbB-3 by an anti-ErbB-3 monoclonal antibody suppressed HRG-induced PR activation, the abolishment of HRG binding to ErbB-4 had no effect on HRG activation of PR. To investigate the role of mitogen-activated protein kinases (MAPKs), we used the selective MEK1/MAPK inhibitor PD98059. Blockage of MAPK activation resulted in complete abrogation of HRG's capacity to induce PR binding to a PRE, as well as CAT activity. Finally, we demonstrate here for the first time that HRG-activated MAPK can phosphorylate both human and mouse PR in vitro. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02707306_v23_n3_p1095_Labriola http://hdl.handle.net/20.500.12110/paper_02707306_v23_n3_p1095_Labriola |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
2 (2 amino 3 methoxyphenyl)chromone antisense oligodeoxynucleotide epidermal growth factor receptor 2 gestagen medroxyprogesterone acetate mifepristone mitogen activated protein kinase mitogen activated protein kinase 1 neu differentiation factor progesterone progesterone receptor protein tyrosine kinase receptor unclassified drug animal cell article autoradiography binding site breast adenocarcinoma breast cancer cancer cell culture carcinogenesis cell nucleus controlled study DNA protein complex down regulation enzyme activation enzyme activity genetic transfection molecular mechanics mouse nonhuman priority journal protein expression protein phosphorylation transactivation transcription initiation Animals Breast Neoplasms Cell Division Cell Nucleus Enzyme Inhibitors Female Flavonoids Genes, erbB-2 Hormone Antagonists Humans Mammary Neoplasms, Experimental Mice Mice, Inbred BALB C Mifepristone Mitogen-Activated Protein Kinases Neuregulin-1 Phosphorylation Receptor, erbB-2 Receptors, Progesterone RNA, Messenger RNA, Neoplasm Trans-Activation (Genetics) Tumor Cells, Cultured Animalia Eukaryota Felis catus Murinae |
| spellingShingle |
2 (2 amino 3 methoxyphenyl)chromone antisense oligodeoxynucleotide epidermal growth factor receptor 2 gestagen medroxyprogesterone acetate mifepristone mitogen activated protein kinase mitogen activated protein kinase 1 neu differentiation factor progesterone progesterone receptor protein tyrosine kinase receptor unclassified drug animal cell article autoradiography binding site breast adenocarcinoma breast cancer cancer cell culture carcinogenesis cell nucleus controlled study DNA protein complex down regulation enzyme activation enzyme activity genetic transfection molecular mechanics mouse nonhuman priority journal protein expression protein phosphorylation transactivation transcription initiation Animals Breast Neoplasms Cell Division Cell Nucleus Enzyme Inhibitors Female Flavonoids Genes, erbB-2 Hormone Antagonists Humans Mammary Neoplasms, Experimental Mice Mice, Inbred BALB C Mifepristone Mitogen-Activated Protein Kinases Neuregulin-1 Phosphorylation Receptor, erbB-2 Receptors, Progesterone RNA, Messenger RNA, Neoplasm Trans-Activation (Genetics) Tumor Cells, Cultured Animalia Eukaryota Felis catus Murinae Heregulin induces transcriptional activation of the progesterone receptor by a mechanism that requires functional ErbB-2 and mitogen-activated protein kinase activation in breast cancer cells |
| topic_facet |
2 (2 amino 3 methoxyphenyl)chromone antisense oligodeoxynucleotide epidermal growth factor receptor 2 gestagen medroxyprogesterone acetate mifepristone mitogen activated protein kinase mitogen activated protein kinase 1 neu differentiation factor progesterone progesterone receptor protein tyrosine kinase receptor unclassified drug animal cell article autoradiography binding site breast adenocarcinoma breast cancer cancer cell culture carcinogenesis cell nucleus controlled study DNA protein complex down regulation enzyme activation enzyme activity genetic transfection molecular mechanics mouse nonhuman priority journal protein expression protein phosphorylation transactivation transcription initiation Animals Breast Neoplasms Cell Division Cell Nucleus Enzyme Inhibitors Female Flavonoids Genes, erbB-2 Hormone Antagonists Humans Mammary Neoplasms, Experimental Mice Mice, Inbred BALB C Mifepristone Mitogen-Activated Protein Kinases Neuregulin-1 Phosphorylation Receptor, erbB-2 Receptors, Progesterone RNA, Messenger RNA, Neoplasm Trans-Activation (Genetics) Tumor Cells, Cultured Animalia Eukaryota Felis catus Murinae |
| description |
The present study addresses the capacity of heregulin (HRG), a ligand of type I receptor tyrosine kinases, to transactivate the progesterone receptor (PR). For this purpose, we studied, on the one hand, an experimental model of hormonal carcinogenesis in which the synthetic progestin medroxyprogesterone acetate (MPA) induced mammary adenocarcinomas in female BALB/c mice and, on the other hand, the human breast cancer cell line T47D. HRG was able to exquisitely regulate biochemical attributes of PR in a way that mimicked PR activation by progestins. Thus, HRG treatment of primary cultures of epithelial cells of the progestin-dependent C4HD murine mammary tumor line and of T47D cells induced a decrease of protein levels of PRA and -B isoforms and the downregulation of progesterone-binding sites. HRG also promoted a significant increase in the percentage of PR localized in the nucleus in both cell types. DNA mobility shift assay revealed that HRG was able to induce PR binding to a progesterone response element (PRE) in C4HD and T47D cells. Transient transfections of C4HD and T47D cells with a plasmid containing a PRE upstream of a chloramphenicol acetyltransferase (CAT) gene demonstrated that HRG promoted a significant increase in CAT activity. In order to assess the molecular mechanisms underlying PR transactivation by HRG, we blocked ErbB-2 expression in C4HD and T47D cells by using antisense oligodeoxynucleotides to ErbB-2 mRNA, which resulted in the abolishment of HRG's capacity to induce PR binding to a PRE, as well as CAT activity in the transient-transfection assays. Although the inhibition of HRG binding to ErbB-3 by an anti-ErbB-3 monoclonal antibody suppressed HRG-induced PR activation, the abolishment of HRG binding to ErbB-4 had no effect on HRG activation of PR. To investigate the role of mitogen-activated protein kinases (MAPKs), we used the selective MEK1/MAPK inhibitor PD98059. Blockage of MAPK activation resulted in complete abrogation of HRG's capacity to induce PR binding to a PRE, as well as CAT activity. Finally, we demonstrate here for the first time that HRG-activated MAPK can phosphorylate both human and mouse PR in vitro. |
| title |
Heregulin induces transcriptional activation of the progesterone receptor by a mechanism that requires functional ErbB-2 and mitogen-activated protein kinase activation in breast cancer cells |
| title_short |
Heregulin induces transcriptional activation of the progesterone receptor by a mechanism that requires functional ErbB-2 and mitogen-activated protein kinase activation in breast cancer cells |
| title_full |
Heregulin induces transcriptional activation of the progesterone receptor by a mechanism that requires functional ErbB-2 and mitogen-activated protein kinase activation in breast cancer cells |
| title_fullStr |
Heregulin induces transcriptional activation of the progesterone receptor by a mechanism that requires functional ErbB-2 and mitogen-activated protein kinase activation in breast cancer cells |
| title_full_unstemmed |
Heregulin induces transcriptional activation of the progesterone receptor by a mechanism that requires functional ErbB-2 and mitogen-activated protein kinase activation in breast cancer cells |
| title_sort |
heregulin induces transcriptional activation of the progesterone receptor by a mechanism that requires functional erbb-2 and mitogen-activated protein kinase activation in breast cancer cells |
| publishDate |
2003 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02707306_v23_n3_p1095_Labriola http://hdl.handle.net/20.500.12110/paper_02707306_v23_n3_p1095_Labriola |
| _version_ |
1768542458030850048 |