5-aza-2′-deoxycytidine upregulates caspase-9 expression cooperating with p53-induced apoptosis in human lung cancer cells

Treating lung cancer cell lines using low-dose 5-aza-2′-deoxycytidine (DAC) caused an accumulation of procaspase-9 through mRNA upregulation, but the cells did not undergo apoptosis. However, when cells were treated with DAC and infected with a low dose of a recombinant wild-type p53 adenovirus vect...

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Veröffentlicht in:Oncogene 2004-09, Vol.23 (40), p.6779-6787
Hauptverfasser: Gomyo, Yoshihito, Sasaki, Ji-ichiro, Branch, Cynthia, Roth, Jack A, Mukhopadhyay, Tapas
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creator Gomyo, Yoshihito
Sasaki, Ji-ichiro
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Mukhopadhyay, Tapas
description Treating lung cancer cell lines using low-dose 5-aza-2′-deoxycytidine (DAC) caused an accumulation of procaspase-9 through mRNA upregulation, but the cells did not undergo apoptosis. However, when cells were treated with DAC and infected with a low dose of a recombinant wild-type p53 adenovirus vector (Ad-p53), a synergistic growth inhibitory effect was observed. Combination treatment induced Apaf-1 and procaspase-9 expression in which cytochrome c releases by Ad-p53 triggered the mitochondrial pathway of apoptosis. Selective blockage of caspase-9 activities by Z-LEHD-FMK completely attenuated DAC-induced enhancement of apoptosis mediated by Ad-p53 infection, and ectopic overexpression of procaspase-9 sensitized cells to Ad-p53-induced apoptosis in p53-null cells. In addition, DAC sensitized lung cancer cells to cisplatin and paclitaxel. Induction of the mitochondrial pathway of apoptosis using a slightly toxic dose of DAC may therefore be a strategy for treating lung cancer, and DAC treatment may have clinical implications when combined with chemotherapy or apoptosis-inducing gene therapy.
doi_str_mv 10.1038/sj.onc.1207381
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subjects Adenovirus
Ageing, cell death
Antimetabolites, Antineoplastic - pharmacology
Apaf-1 protein
Apoptosis
Apoptosis - drug effects
Apoptosis - physiology
Azacitidine - analogs & derivatives
Azacitidine - pharmacology
Biological and medical sciences
Cancer therapies
Caspase 9
Caspases - genetics
Cell Biology
Cell Line, Tumor
Cell physiology
Cell transformation and carcinogenesis. Action of oncogenes and antioncogenes
Chemotherapy
Cisplatin
Cytochrome c
Fundamental and applied biological sciences. Psychology
Gene Expression Regulation, Enzymologic - drug effects
Gene Expression Regulation, Enzymologic - genetics
Gene Expression Regulation, Neoplastic - drug effects
Gene Expression Regulation, Neoplastic - genetics
Gene therapy
Human Genetics
Humans
Internal Medicine
Lung cancer
Lung Neoplasms - pathology
Medical sciences
Medicine
Medicine & Public Health
Mitochondria
Molecular and cellular biology
mRNA
Null cells
Oncology
original-paper
p53 Protein
Paclitaxel
Pneumology
Tumor cell lines
Tumor Suppressor Protein p53 - physiology
Tumors of the respiratory system and mediastinum
title 5-aza-2′-deoxycytidine upregulates caspase-9 expression cooperating with p53-induced apoptosis in human lung cancer cells
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