Oncogenic HRAS suppresses clusterin expression through promoter hypermethylation

Silencing of gene expression by methylation of CpG islands in regulatory elements is frequently observed in cancer. However, an influence of the most common oncogenic signalling pathways onto DNA methylation has not yet been investigated thoroughly. To address this issue, we identified genes suppres...

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Veröffentlicht in:Oncogene 2006-08, Vol.25 (35), p.4890-4903
Hauptverfasser: Lund, P, Weißhaupt, K, Mikeska, T, Jammas, D, Chen, X, Kuban, R-J, Ungethüm, U, Krapfenbauer, U, Herzel, H-P, Schäfer, R, Walter, J, Sers, C
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container_end_page 4903
container_issue 35
container_start_page 4890
container_title Oncogene
container_volume 25
creator Lund, P
Weißhaupt, K
Mikeska, T
Jammas, D
Chen, X
Kuban, R-J
Ungethüm, U
Krapfenbauer, U
Herzel, H-P
Schäfer, R
Walter, J
Sers, C
description Silencing of gene expression by methylation of CpG islands in regulatory elements is frequently observed in cancer. However, an influence of the most common oncogenic signalling pathways onto DNA methylation has not yet been investigated thoroughly. To address this issue, we identified genes suppressed in HRAS -transformed rat fibroblasts but upregulated after treatment with the demethylating agent 5-Aza-2-deoxycytidine and with the MEK1,2 inhibitor U0126. Analysis of gene expression by microarray and Northern blot analysis revealed the MEK/ERK target genes clusterin , matrix metalloproteinase 2 ( Mmp2 ), peptidylpropyl isomerase C-associated protein , syndecan 4, Timp2 and Thbs1 to be repressed in the HRAS -transformed FE-8 cells in a MEK/ERK- and methylation-dependent manner. Hypermethylation of putative regulatory elements in HRAS -transformed cells as compared to immortalized fibroblasts was detected within a CpG island 14.5 kb upstream of clusterin , within the clusterin promoter and within a CpG island of the Mmp2 promoter by bisulphite sequencing. Furthermore, hypermethylation of the clusterin promoter was observed 10 days after induction of HRAS in immortalized rat fibroblasts and a clear correlation between reduced clusterin expression and hypermethlyation could also be observed in distinct rat tissues. These results suggest that silencing of individual genes by DNA methylation is controlled by oncogenic signalling pathways, yet the mechanisms responsible for initial target gene suppression are variable.
doi_str_mv 10.1038/sj.onc.1209502
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Action of oncogenes and antioncogenes</subject><subject>Clusterin</subject><subject>Clusterin - antagonists &amp; inhibitors</subject><subject>Clusterin - biosynthesis</subject><subject>Clusterin - genetics</subject><subject>CpG islands</subject><subject>DNA Methylation</subject><subject>DNA microarrays</subject><subject>Fibroblasts</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Gelatinase A</subject><subject>Gene expression</subject><subject>Gene silencing</subject><subject>Genes, ras</subject><subject>Genes, Suppressor</subject><subject>Human Genetics</subject><subject>Hydroxamic Acids - pharmacology</subject><subject>Internal Medicine</subject><subject>Matrix metalloproteinase</subject><subject>Medicine</subject><subject>Medicine &amp; Public Health</subject><subject>Metalloproteinase</subject><subject>Molecular and cellular biology</subject><subject>Molecular genetics</subject><subject>Oncology</subject><subject>original-article</subject><subject>Promoter Regions, Genetic</subject><subject>Rats</subject><subject>Regulatory sequences</subject><subject>Rodents</subject><subject>Signal transduction</subject><subject>Signal Transduction - genetics</subject><subject>Syndecan</subject><subject>Tissue inhibitor of metalloproteinase 2</subject><subject>Transcription. Transcription factor. Splicing. 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subjects Animals
Antimetabolites, Antineoplastic - pharmacology
Apoptosis
Apoptosis - drug effects
Azacitidine - analogs & derivatives
Azacitidine - pharmacology
Biological and medical sciences
Cell Biology
Cell Line, Transformed
Cell physiology
Cell transformation and carcinogenesis. Action of oncogenes and antioncogenes
Clusterin
Clusterin - antagonists & inhibitors
Clusterin - biosynthesis
Clusterin - genetics
CpG islands
DNA Methylation
DNA microarrays
Fibroblasts
Fundamental and applied biological sciences. Psychology
Gelatinase A
Gene expression
Gene silencing
Genes, ras
Genes, Suppressor
Human Genetics
Hydroxamic Acids - pharmacology
Internal Medicine
Matrix metalloproteinase
Medicine
Medicine & Public Health
Metalloproteinase
Molecular and cellular biology
Molecular genetics
Oncology
original-article
Promoter Regions, Genetic
Rats
Regulatory sequences
Rodents
Signal transduction
Signal Transduction - genetics
Syndecan
Tissue inhibitor of metalloproteinase 2
Transcription. Transcription factor. Splicing. Rna processing
Transformed cells
title Oncogenic HRAS suppresses clusterin expression through promoter hypermethylation
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