Catania, Annunziata (2006) Selective transcription and cellular proliferation induced by PDGF require histone deacetylase activity. [Tesi di dottorato] (Inedito)

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Tipologia del documento: Tesi di dottorato
Lingua: English
Titolo: Selective transcription and cellular proliferation induced by PDGF require histone deacetylase activity
Autori:
AutoreEmail
Catania, Annunziata[non definito]
Data: 2006
Tipo di data: Pubblicazione
Numero di pagine: 38
Istituzione: Università degli Studi di Napoli Federico II
Dipartimento: Biologia e patologia cellullare e molecolare "L. Califano"
Dottorato: Patologia e fisiopatologia molecolare
Ciclo di dottorato: 17
Coordinatore del Corso di dottorato:
nomeemail
Avvedimento, Vittorio Enrico[non definito]
Tutor:
nomeemail
Carlomagno, Maria Stella[non definito]
Data: 2006
Numero di pagine: 38
Parole chiave: Tyrosine kinase receptors; Phosphorylation; Histone deacetylases inhibitors; STAT activation; Oncogenes
Settori scientifico-disciplinari del MIUR: Area 06 - Scienze mediche > MED/04 - Patologia generale
Depositato il: 30 Lug 2008
Ultima modifica: 05 Dic 2014 11:40
URI: http://www.fedoa.unina.it/id/eprint/779
DOI: 10.6092/UNINA/FEDOA/779

Abstract

Histone deacetylases (HDACs) are key regulatory enzymes involved in the control of gene expression in any cell type, and their inhibition by specific drugs has been widely correlated to cell cycle arrest, terminal differentiation and apoptosis. Although some of these compounds gave already very promising results in Phase I and II clinical trials for a large array of tumors, the molecular targets responsible for their anti-tumoral activity are still largely unknown. Here, we investigated whether HDAC activity was required for PDGF-dependent signal transduction and cellular proliferation. Exposure of PDGF-stimulated NIH3T3 fibroblasts to the HDAC inhibitor trichostatin A (TSA) potently repressed the expression of a group of genes strongly correlated to PDGF-dependent cellular growth and pro-survival activity, namely c-myc, VEGF and bcl-XL. Moreover, we show that TSA interfered with STAT3-dependent transcriptional activity induced by PDGF, suggesting STAT proteins as mediators of HDAC activity on PDGF transcriptional responses. Still, neither phosphorylation nor nuclear translocation and DNA-binding of STAT3 were affected by using TSA to interfere with PDGF stimulation. Finally, TSA treatment resulted in the suppression of PDGF-dependent cell proliferation as scored by a bromodeoxyuridine (BrdU) incorporation assay. Our data indicate that inhibition of HDAC activity by specific pharmacological inhibitors antagonizes the mitogenic effect of PDGF, suggesting that these drugs may specifically act on the expression of growth-related, STAT-dependent, PDGF early- and late-responsive genes.

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