[The effect of antisense survivin-liposome complex on cell growth, apoptosis and cell cycle in hepatocellular carcinoma cells].
OBJECTIVE
To investigate the effects and the mechanisms of cell growth inhibition in hepatocellular carcinoma cells after induction with antisense survivin-liposome (LIP) complex, and to provide evidence in treatment for hepatocellular carcinoma and tumors expressing survivin.


METHODS
Survivin ODNs was transfected into HepG2 cells mediated by LiP reagent. The expression of survivin mRNA and protein was detected by RT-PCR and Western blot. MTT assay was applied to determine cell proliferation in HepG2 cells. Active caspase-3 and apoptosis rate were evaluated by flow cytometric analysis. The morphological changes were assessed by electron microscopy. Cell cycle was analyzed by flow cytometry in the cell cycle-synchronized hepatocellular carcinoma cells treated with the antisense compound.


RESULTS
Antisense compound efficiently down-regulated survivin expression (mRNA and protein) in a dose-dependent manner with an IC(50) of 250 nmol/L. Its maximal effect was achieved at a concentration of 600 nmol/L, when expression levels were down-regulated by 80%, as revealed by gradually increase of caspase-3-like protease activity and apoptosis rate in a time-dependent manner. Morphological apoptotic changes such as membrane blebbing, loss of microvilli, cytoplasmic vasculization, condensation of cytoplasm and nucleus, chromatin fragmentation, and apoptosis and cell growth inhibition were observed. In the cell cycle-synchronized hepatocellular carcinoma cells, antisense compound induced cell cycle arrest followed by apoptosis. After treated with low concentration of compound, the cell cycle was arrested at S phase or G2/M phase; while at high concentration, the cell cycle was mainly arrested at S phase. Apoptosis was obviously observed and the rate of apoptosis was increased in a time and concentration-dependent manner.


CONCLUSIONS
Antisense survivin has significant inhibitory effect on growth of hepatocellular carcinoma cells in vitro. This is associated with cell cycle arrest and apoptosis.
Dai
De-jian
DJ
Department of General Surgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China.
Wu
Dan
D
Meng
Hua
H
Lu
Cai-de
CD
D017209:Apoptosis / Q000187:drug effects*; D006528:Carcinoma, Hepatocellular / Q000473:pathology*; D053148:Caspase 3; D020169:Caspases / Q000378:metabolism; D002453:Cell Cycle / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D006801:Humans; D051034:Inhibitor of Apoptosis Proteins; D008081:Liposomes; D008113:Liver Neoplasms / Q000473:pathology*; D008869:Microtubule-Associated Proteins / Q000378:metabolism / Q000494:pharmacology*; D009363:Neoplasm Proteins / Q000378:metabolism / Q000494:pharmacology*; D016376:Oligonucleotides, Antisense / Q000494:pharmacology*; D000077022:Survivin
C107489:BIRC5 protein, human; D051034:Inhibitor of Apoptosis Proteins; D008081:Liposomes; D008869:Microtubule-Associated Proteins; D009363:Neoplasm Proteins; D016376:Oligonucleotides, Antisense; D000077022:Survivin; C505407:CASP3 protein, human; D053148:Caspase 3; D020169:Caspases