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Suppression of Bcl-xL expression by a novel tumor-specific RNA interference system inhibits proliferation and enhances radiosensitivity in prostatic carcinoma cells

Bcl-xL , a novel member of anti-apoptotic Bcl-2 family that play important roles in regulating cell survival and apoptosis, is frequently overexpressed in various kinds of human cancers, including prostatic carcinoma. To explore its possibility as a therapeutic target for prostatic carcinoma, we dev...

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Published in:Cancer chemotherapy and pharmacology 2008-05, Vol.61 (6), p.943-952
Main Authors: Wang, Rui, Lin, Fang, Wang, Xi, Gao, Ping, Dong, Ke, Wei, San-Hua, Cheng, Shi-Yin, Zhang, Hui-Zhong
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description Bcl-xL , a novel member of anti-apoptotic Bcl-2 family that play important roles in regulating cell survival and apoptosis, is frequently overexpressed in various kinds of human cancers, including prostatic carcinoma. To explore its possibility as a therapeutic target for prostatic carcinoma, we developed a novel tumor-specific RNA interference system by using survivin promoter and employed it to suppress exogenous reporters ( LUC and EGFP ) and endogenous gene Bcl-xL expression and analyzed its phenotypes. We found that expression of exogenous reporters ( LUC and EGFP ) was specifically inhibited in tumor cells but not in normal cells. We also observed that the specific inhibition of Bcl-xL in human prostatic carcinoma cells (PC3) strongly suppressed in vitro cell proliferation and in vivo tumorigenicity. We observed significant apoptosis induction and radiosensitivity enhancement in PC3 cells by the RNA interference-mediated suppression of Bcl-xL expression. All these results indicate that inhibition of Bcl-xL expression can result in potent antitumor activity and radiosensitization in human prostatic carcinoma.
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subjects Antineoplastic agents
Apoptosis - drug effects
bcl-X Protein - antagonists & inhibitors
bcl-X Protein - biosynthesis
bcl-X Protein - genetics
Biological and medical sciences
Blotting, Western
Cancer Research
Cell Line, Tumor
Cell Proliferation - drug effects
Down-Regulation - drug effects
Flow Cytometry
Green Fluorescent Proteins - genetics
Humans
In Situ Nick-End Labeling
Luciferases - genetics
Male
Medical sciences
Medicine
Medicine & Public Health
Neoplasm Transplantation
Nephrology. Urinary tract diseases
Oncology
Original Article
Pharmacology. Drug treatments
Pharmacology/Toxicology
Plasmids - genetics
Promoter Regions, Genetic - genetics
Prostatic Neoplasms - drug therapy
Prostatic Neoplasms - metabolism
Prostatic Neoplasms - pathology
Radiation-Sensitizing Agents - pharmacology
Reverse Transcriptase Polymerase Chain Reaction
RNA Interference - physiology
Tetrazolium Salts
Thiazoles
Transfection
Transplantation, Heterologous
Tumor Stem Cell Assay
Tumors of the urinary system
Urinary tract. Prostate gland
title Suppression of Bcl-xL expression by a novel tumor-specific RNA interference system inhibits proliferation and enhances radiosensitivity in prostatic carcinoma cells
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