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Abstract:

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.

Registro:

Documento: Artículo
Título: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
Autor:Labriola, L.; Salatino, M.; Proietti, C.J.; Pecei, A.; Coso, O.A.; Kornblihtt, A.R.; Charreau, E.H.; Elizalde, P.V.
Filiación:Inst. de Biol./Medicina Experimental, Buenos Aires 1428, Argentina
Fac. de Ciencias Exactas/Naturales, Universidad de Buenos Aires, Buenos Aires 1428, Argentina
Lab. Molec. Mech. of Carcinogenesis, Inst. de Biol./Medicina Experimental, Obligado 2490, Buenos Aires 1428, Argentina
Palabras clave: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
Año:2003
Volumen:23
Número:3
Página de inicio:1095
Página de fin:1111
DOI: http://dx.doi.org/10.1128/MCB.23.3.1095-1111.2003
Título revista:Molecular and Cellular Biology
Título revista abreviado:Mol. Cell. Biol.
ISSN:02707306
CODEN:MCEBD
CAS:2 (2 amino 3 methoxyphenyl)chromone, 167869-21-8; epidermal growth factor receptor 2, 137632-09-8; medroxyprogesterone acetate, 71-58-9; mifepristone, 84371-65-3; mitogen activated protein kinase 1, 137632-08-7; mitogen activated protein kinase, 142243-02-5; progesterone, 57-83-0; protein, 67254-75-5; Enzyme Inhibitors; Flavonoids; Hormone Antagonists; Mifepristone, 84371-65-3; Mitogen-Activated Protein Kinases, EC 2.7.1.37; Neuregulin-1; PD 98059; progesterone receptor A; progesterone receptor B; Receptor, erbB-2, EC 2.7.1.112; Receptors, Progesterone; RNA, Messenger; RNA, Neoplasm
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02707306_v23_n3_p1095_Labriola

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Citas:

---------- APA ----------
Labriola, L., Salatino, M., Proietti, C.J., Pecei, A., Coso, O.A., Kornblihtt, A.R., Charreau, E.H.,..., Elizalde, P.V. (2003) . 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. Molecular and Cellular Biology, 23(3), 1095-1111.
http://dx.doi.org/10.1128/MCB.23.3.1095-1111.2003
---------- CHICAGO ----------
Labriola, L., Salatino, M., Proietti, C.J., Pecei, A., Coso, O.A., Kornblihtt, A.R., et al. "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" . Molecular and Cellular Biology 23, no. 3 (2003) : 1095-1111.
http://dx.doi.org/10.1128/MCB.23.3.1095-1111.2003
---------- MLA ----------
Labriola, L., Salatino, M., Proietti, C.J., Pecei, A., Coso, O.A., Kornblihtt, A.R., et al. "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" . Molecular and Cellular Biology, vol. 23, no. 3, 2003, pp. 1095-1111.
http://dx.doi.org/10.1128/MCB.23.3.1095-1111.2003
---------- VANCOUVER ----------
Labriola, L., Salatino, M., Proietti, C.J., Pecei, A., Coso, O.A., Kornblihtt, A.R., et al. 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. Mol. Cell. Biol. 2003;23(3):1095-1111.
http://dx.doi.org/10.1128/MCB.23.3.1095-1111.2003