Silencing the Metallothionein-2A gene inhibits cell cycle progression from G1- to S-phase involving ATM and cdc25A signaling in breast cancer cells
Copyright policy )Silencing the Metallothionein-2A gene inhibits cell cycle progression from G1- to S-phase involving ATM and cdc25A signaling in breast cancer cells
Metallothioneins (MTs) are a group of metal-binding proteins involved in cell proliferation, differentiation and apoptosis. The MT-2A isoform is generally the most abundant isoform among the 10 known functional MT genes. In the present study, we observed that down-regulation of the MT-2A gene in MCF-7 cells via siRNA-mediated silencing inhibited cell growth by inducing cell cycle arrest in G1-phase (G1-arrest) and a marginal increase in cells in sub-G1-phase. Scanning electron microscopic examination of the cells with silenced expression of MT-2A (siMT-2A cells) revealed essentially normal cell morphology with presence of scattered apoptotic cells. To elucidate the underlying molecular mechanism, we examined the expression of cell cycle related genes in MT-2A-silenced cells and found a higher expression of the ataxia telangiectasia mutated (ATM) gene concomitant with a lower expression of the cdc25A gene. These data suggest that MT-2A could plausibly modulate cell cycle progression from G1- to S-phase via the ATM/Chk2/cdc25A pathway.
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- National University of Singapore Singapore
570, Blotting, Western, Down-Regulation, Gene Expression, Breast Neoplasms, Cell Cycle Proteins, Ataxia Telangiectasia Mutated Proteins, Cell cycle, Protein Serine-Threonine Kinases, Breast cancer, Cell Line, Tumor, 616, Humans, Gene Silencing, RNA, Messenger, Cell Proliferation, Cell Cycle, G1 Phase, Flow Cytometry, DNA-Binding Proteins, Checkpoint Kinase 2, cdc25A, ATM, Microscopy, Electron, Scanning, Female, Metallothionein
570, Blotting, Western, Down-Regulation, Gene Expression, Breast Neoplasms, Cell Cycle Proteins, Ataxia Telangiectasia Mutated Proteins, Cell cycle, Protein Serine-Threonine Kinases, Breast cancer, Cell Line, Tumor, 616, Humans, Gene Silencing, RNA, Messenger, Cell Proliferation, Cell Cycle, G1 Phase, Flow Cytometry, DNA-Binding Proteins, Checkpoint Kinase 2, cdc25A, ATM, Microscopy, Electron, Scanning, Female, Metallothionein
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