Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/24135
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Ha-ras interference with thyroid cell differentiation is associated with a down-regulation of thyroid transcription factor-1 phosphorylation |
Autor: | Velasco, Juan A.; Acebrón, Alvaro CSIC; Zannini, Mariastella; Martín-Pérez, Jorge CSIC ORCID ; Lauro, Roberto di; Santisteban, Pilar CSIC ORCID | Fecha de publicación: | jun-1998 | Editor: | Endocrine Society | Citación: | Endocrinology 139(6): 2796-2802 (1998) | Resumen: | Mechanisms responsible for the lack of thyroid-specific differentiation markers in Ha-ras transformed FRTL-5 cells have been investigated. In vivo cell labeling and immunoprecipitation demonstrate that phosphorylation of the thyroid transcription factor-1 (TTF-1) is clearly reduced in thyroid cells transformed with the Ha-ras oncogene. Fingerprinting analysis of phosphotryptic peptides from FRTL-5 and Ha-ras-FRTL-5 cells also reveals a heterogeneous pattern of TTF-1 phosphorylation in the transformed cell line. This heterogeneity is localized in the amino terminal cluster of phosphoserines, as determined by transfection of HeLa cells with TTF-1 mutants in which serine residues have been replaced by alanines. Amplification and nucleotide sequence of the 5'-coding region of the TTF-1 gene in Ha-ras-FRTL-5 cells rule out the possibility that differences in phosphorylation were the consequence of any mutational event affecting residues within the N-terminal protein sequence. Hypophosphorylated TTF-1 is still able to bind its DNA consensus sequence within the thyroglobulin promoter, although a reporter construct whose expression is exclusively dependent on TTF-1 is not transactivated. Transfection of Ha-ras-FRTL-5 cells with an expression vector encoding the cAMP dependent protein kinase A (PKA) catalytic subunit partially reestablishes TTF-1 transcriptional activity. Taken together, these results indicate that the lack of specific thyroid gene expression in Ha-ras-FRTL-5 cells could be a direct consequence of the inability of TTF-1 to promote transcription. | Descripción: | 7 pages, 6 figures. | Versión del editor: | http://dx.doi.org/10.1210/en.139.6.2796 | URI: | http://hdl.handle.net/10261/24135 | DOI: | 10.1210/en.139.6.2796 | ISSN: | 0013-7227 |
Aparece en las colecciones: | (IIBM) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
Ha-ras interference.pdf | 296,5 kB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
WEB OF SCIENCETM
Citations
19
checked on 28-feb-2024
Page view(s)
379
checked on 18-mar-2024
Download(s)
273
checked on 18-mar-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.