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Synergistic anti-tumor efficacy of lovastatin and protein kinase C-beta inhibitor in hepatocellular carcinoma

Cited 25 time in Web of Science Cited 29 time in Scopus
Authors
Kim, Won; Yoon, Jung-Hwan; Kim, Jung-Ryul; Jang, In-Jin; Bang, Yung-Jue; Kim, Yoon-Jun; Lee, Hyo-Suk
Issue Date
2008-12-20
Publisher
Springer Verlag
Citation
Cancer Chemother Pharmacol. 64(3):497-507
Keywords
AnimalsAntineoplastic Combined Chemotherapy Protocols/*pharmacologyApoptosis/drug effectsCarcinoma, Hepatocellular/*drug therapy/physiopathologyCell Line, TumorDisease ProgressionDrug SynergismHumansHydroxymethylglutaryl-CoA Reductase Inhibitors/pharmacologyIn Situ Nick-End LabelingIndoles/administration & dosageLiver Neoplasms, Experimental/*drug therapy/physiopathologyLovastatin/administration & dosageMaleMiceMice, Inbred C3HMicrovessels/pathologyNeoplasm TransplantationProtein Kinase C/*antagonists & inhibitors
Abstract
PURPOSE: Hepatocellular carcinoma (HCC) is characterized by hypervascularity and chemoresistance. Protein kinase C (PKC) participates in cancer progression by enhancing anti-apoptotic signals, angiogenesis, and chemoresistance. Statins have a selective anti-cancer effect due to over-expression of 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMG-CoAR) in cancer cells, but statins may also activate PKC. Thus, we hypothesized that simultaneous treatment with statin and PKC inhibitor might synergistically enhance their anti-tumor efficacies against HCCs. METHODS: Hepatocellular carcinoma cell growth was assessed using MTS assays, apoptotic cell death by DAPI staining, and apoptotic signaling cascades were explored by immunoblotting. An in vivo model of HCC was established in C3H mice intradermally implanted with MH134 cells. Lovastatin and/or a PKC inhibitor (enzastaurin) was subsequently administered. Anti-tumor efficacies were evaluated by measuring tumor volumes and quantifying apoptotic cells and microvessel densities (MVD). RESULTS: Co-treatment with lovastatin and enzastaurin was found to synergistically suppress HCC cell growth in vitro. Lovastatin induced HCC cellular apoptosis by activating mitochondrial apoptotic signals, and although enzastaurin alone did not induce apoptosis, its addition significantly enhanced lovastatin-induced apoptosis. This enhanced apoptosis was attributed to increased caspase-9 activation in these cells. Moreover, tumor growth was significantly suppressed in mice co-treated with lovastatin and enzastaurin, and percentages of TUNEL-positive cells were significantly increased and MVDs were significantly decreased in those mice. CONCLUSION: Combinatorial treatment with statin and PKC inhibitor was found to enhance anti-tumor efficacy in vivo and in vitro. Further studies are warranted to prove anti-tumor efficacy of this potential therapy in human HCCs.
ISSN
1432-0843 (Electronic)
Language
English
URI
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=19096848

http://www.springerlink.com/content/t0w03w517206q706/fulltext.pdf

http://hdl.handle.net/10371/67542
DOI
https://doi.org/10.1007/s00280-008-0897-1
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College of Medicine/School of Medicine (의과대학/대학원)Pharmacology (약리학전공)Journal Papers (저널논문_약리학전공)
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