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Impact Of Plk-1 Silencing On Endothelial Cells And Cancer Cells Of Diverse Histological Origin.
MedLine Citation:
PMID:  23531193     Owner:  NLM     Status:  Publisher    
The main goal of this work was to assess in vitro the potential of Polo-like kinase gene (PLK-1) as a molecular target within the tumor microenvironment, namely in both cancer cells of tumors of different histological origin and endothelial cells from angiogenic blood vessels, upon silencing with anti-PLK-1 siRNA. In addition, the effect of Plk-1 downregulation on the cancer cells chemosensitization to paclitaxel was further assessed. Downregulation of Plk-1 reduced cancer cells viability from 40 to 85% and up to 59% in endothelial cells. Regarding the latter, it compromised their ability to form new tube-like structures, decreasing the formation of network projections up to 46%. This suggested for the first time, PLK-1 as a valuable angiogenic molecular target. In combination with paclitaxel, anti-PLK-1 siRNA chemosensitized non-small cell lung cancer (NSCLC) and prostate carcinoma cell lines, leading up to a 2-fold increase in the drug cytotoxic effect. Moreover, the sequential incubation of anti-PLK-1 siRNA and paclitaxel led to a decrease in the IC50 of the latter up to 2.7- and 4.1-fold, in A-549 and PC-3 cells, respectively. The combination of anti-PLK-1 siRNA with paclitaxel led to cell cycle arrest, increasing the number of cells at the G2/M and S phases to 1.5 and 1.3-fold in PC-3 cells, and to 1.6 and 1.4-fold in A-549 cells, respectively. Overall, it has been demonstrated that PLK-1 silencing with siRNA can impact multiple cellular players of tumor aggressiveness, thus enabling the opportunity to interfere with different hallmarks of cancer, in tumors with diverse histological origin.
Carla P Gomes; Lígia C Gomes-da-Silva; José S Ramalho; M Conceição Pedroso de Lima; Sérgio Simões; João N Moreira
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-3-25
Journal Detail:
Title:  Current gene therapy     Volume:  -     ISSN:  1875-5631     ISO Abbreviation:  Curr Gene Ther     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-3-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101125446     Medline TA:  Curr Gene Ther     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Center for Neurosciences and Cell Biology, University of Coimbra, Largo Marquês de Pombal, 3004-517 Coimbra, Portugal.
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