Document Detail

Combination of HDAC and topoisomerase inhibitors in small cell lung cancer.
MedLine Citation:
PMID:  22441819     Owner:  NLM     Status:  Publisher    
Histone deacetylase (HDAC) inhibitors, including MGCD0103 and vorinostat, have led to tumor growth inhibition and apoptosis in vivo. However, with limited single-agent activity demonstrated in solid tumor trials, we examined the potential for enhanced effects in combination with topoisomerase I and II inhibitors, a staple for treatment in refractory small cell lung cancer (SCLC). SCLC cell lines were exposed to increasing concentrations of single-agent HDAC inhibitors and topoisomerase inhibitors, in various combinations, to assess for cell viability, additivity or synergy, and apoptosis. We found that MGCD0103 and vorinostat decreased cell viability by at least 60% and 80%, respectively. In the majority of cell lines, the strongest synergism was seen when vorinostat was followed by either etoposide or topotecan; concurrent therapy led to antagonism in most cell lines. Synergistic effects were seen when MGCD0103 was given concurrently or sequentially with both amrubicin and epirubicin. Enhanced additive effects leading to caspase activation were noted for the combination of MGCD0103 or vorinostat with a topoisomerase inhibitor versus either agent alone. Thus, the combination of HDAC inhibitors and topoisomerase inhibitors showed enhanced cytotoxic effects in SCLC cell lines. Further evaluation in a clinical setting may be warranted.
Jhanelle Gray; Christopher L Cubitt; Shumin Zhang; Alberto Chiappori
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-01
Journal Detail:
Title:  Cancer biology & therapy     Volume:  13     ISSN:  1555-8576     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-3-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101137842     Medline TA:  Cancer Biol Ther     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
H. Lee Moffitt Cancer Center and Research Institute; Tampa, Florida.
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