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Título: | Ras- and Raf-mediated regulation of transforming growth factor β1 gene expression by ligands of tyrosine kinase receptors in PC12 cells |
Autor: | Cosgaya, José Miguel CSIC ORCID; Aranda, Ana CSIC ORCID | Palabras clave: | Egr-1 Growth factors PC12 cells Raf Ras TGF-β1 |
Fecha de publicación: | 20-jun-1996 | Editor: | Nature Publishing Group | Citación: | Oncogene 12(12): 2651-2660 (1996) | Resumen: | Different ligands of tyrosine kinase receptors have neurotrophic or mitogenic effects in PC12 cells. NFG and FGF, which cause morphological differentiation, as well as EGF, that induces cell growth, produce a significant increase of TGF-β1 transcripts in PC12 cells. Sequences responsible for the transcriptional effects of the growth factors are located in the 5'-flanking region of the TGF-β1 gene. The TGF-β1 gene has two promoters and the growth factors significantly enhance the activity of constructs containing either the first or the second promoter. A functional p21(ras) is required for the regulation of TGF-β1 by ligands of tyrosine kinase receptors since expression of oncogenic ras in PC12 cells also increases TGF-β1 transcripts, and a dominant inhibitory pas mutant blocks activation of TGF-β1 gene expression by NGF. Oncogenic raf stimulates the activity of both promoters and a dominant negative raf also significantly inhibits growth factor activation. As determined by Mv1Lu cell proliferation inhibition assay, PC12 cells release a significant amount of TGF-β1 in a latent form and incubation with growth factors or expression of oncogenic ras further increase TGF-β1 production. These results suggest that during proliferation or growth factor-induced differentiation of sympathetic neurons there is an increase in TGF-β1 that could be an important mediator of neural cells function. | URI: | http://hdl.handle.net/10261/268221 | Identificadores: | issn: 0950-9232 e-issn: 1476-5594 |
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