Abstract:
:Effective therapy for advanced hepatocellular carcinoma (HCC) is lacking. Conventional chemotherapy was judged to be ineffective. We previously demonstrated that the histone deacetylase inhibitor Trichostatin A (TSA) blocks growth of HCC cells in vitro. The anti-tumoral effect of a combination of more than 2 classes of drugs remains unexplored. Four hepatoma cell lines were incubated with increasing concentrations of Tamoxifen (TAM), 9-cis retinoic acid (CRA), the methioninaminopeptidase inhibitor TNP-470 and TSA as single agents and in combination. Anti-proliferative and pro-apoptotic effects were assessed using BrdU-incorporation, FACS analysis and immunocytochemistry. Central pro- and anti-apoptotic proteins were measured by semi-quantitative Western blotting and substrate assays. All single substances inhibited proliferation and induced apoptosis in HCC cells only at high concentrations. The combination of TAM/CRA/TNP/TSA multiplied the anti-tumoral effects, reaching up to 93% inhibition of proliferation and 63% induction of apoptosis after 24 h in Hep1B cells. Pro-apoptotic factors bax and caspase 3 were highly increased with quadruple therapy, while anti-apoptotic bcl-2 decreased to undetectable levels. Fibroblasts remained largely unaffected. While the single substances were not effective on hepatoma cells in tolerable doses, their combination significantly increases anti-tumoral efficacy. Combination therapy with biomodulators is a promising treatment option for HCC.
journal_name
Oncol Repjournal_title
Oncology reportsauthors
Ganslmayer M,Ocker M,Zopf S,Leitner S,Hahn EG,Schuppan D,Herold Ckeywords:
subject
Has Abstractpub_date
2004-05-01 00:00:00pages
943-50issue
5eissn
1021-335Xissn
1791-2431journal_volume
11pub_type
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