Quanto è utile/interessante questa discussione:
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Danae
Nuovo Arrivato
Città: Pisa
7 Messaggi |
 Inserito il - 30 marzo 2009 : 13:02:49
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Qualcuno di voi sa indicarmi il meccanismo d'azione del farmaco antitumorale Vorinostat? Ho cercato in letteratura, e ho capito che agisce inibendo l'enzima istone deacetilasi.. ma vorrei sapere come lo fa.. se esistono dei mediatori, o dei secondi messaggeri.
Grazie, se mi aiuterete vi sarò riconoscente! 
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Alessandrov
Nuovo Arrivato
Città: Roma
67 Messaggi |
Inserito il - 30 marzo 2009 : 15:56:27
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vedi se questo abstract può interessarti
Suberoylanilide hydroxamic acid (vorinostat) represses androgen receptor expression and acts synergistically with an androgen receptor antagonist to inhibit prostate cancer cell proliferation.
Authors:
Marrocco DL
Tilley WD
Bianco-Miotto T
Evdokiou A
Scher HI
Rifkind RA
Marks PA
Richon VM
Butler LM
Author Address: Dame Roma Mitchell Cancer Research Laboratories, Department of Medicine, University of Adelaide, Hanson Institute, Adelaide, South Australia 5000, Australia.
Source: Mol Cancer Ther. 2007, Jan; 6(1):51-60. [Molecular cancer therapeutics]
Abstract:
Growth of prostate cancer cells is initially dependent on androgens, and androgen ablation therapy is used to control tumor growth. Unfortunately, resistance to androgen ablation therapy inevitably occurs, and there is an urgent need for better treatments for advanced prostate cancer. Histone deacetylase inhibitors, such as suberoylanilide hydroxamic acid (SAHA; vorinostat), are promising agents for the treatment of a range of malignancies, including prostate cancer. SAHA inhibited growth of the androgen-responsive LNCaP prostate cancer cell line at low micromolar concentrations and induced caspase-dependent apoptosis associated with chromatin condensation, DNA fragmentation, and mitochondrial membrane depolarization at higher concentrations (>/=5 mumol/L). Gene profiling and immunoblot analyses showed a decrease in androgen receptor (AR) mRNA and protein in LNCaP cells cultured with SAHA compared with control cells, with a corresponding decrease in levels of the AR-regulated gene, prostate-specific antigen. Culture of LNCaP cells in steroid-free medium markedly sensitized the cells to SAHA. Moreover, a combination of low, subeffective doses of SAHA and the AR antagonist bicalutamide resulted in a synergistic reduction in cell proliferation and increase in caspase-dependent cell death. Addition of exogenous androgen prevented the induction of cell death, indicating that suppression of androgen signaling was required for synergy. At the subeffective concentrations, these agents had no effect, alone or in combination, on proliferation or death of AR-negative PC-3 prostate cancer cells. Our findings indicate that SAHA is effective in targeting the AR signaling axis and that androgen deprivation sensitizes prostate cancer cells to SAHA. Consequently, combinatorial treatments that target different components of the AR pathway may afford a more effective strategy to control the growth of prostate cancer cells. |
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Danae
Nuovo Arrivato
Città: Pisa
7 Messaggi |
Inserito il - 30 marzo 2009 : 16:58:21
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Grazie Alessandrov per l'abstract, ma purtroppo non mi dice niente di nuovo.. sisi, arriva a indurre caspasi e quindi apoptosi oltre a ristabilire l'espressione di oncosoppressori, ma quello che cercavo io era il passaggio intermedio.. come ci riesce?
Grazie lo stesso!
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Alessandrov
Nuovo Arrivato
Città: Roma
67 Messaggi |
Inserito il - 30 marzo 2009 : 17:11:32
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| mi spiace.personalmente non conosco tale molecola ma se è molto recente forse non si conoscono dettagliatamente i meccanismi di azione molecolari e per questo non si trova nulla in letteratura. |
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Vorinostat
