The SFRP family of WNT inhibitors function as novel tumor suppressor genes epigenetically silenced in medulloblastoma

Medulloblastoma (MB) is the most common malignant pediatric brain tumor. Dysregulation of WNT signaling occurs in up to 20% of cases. Using a genome-wide approach, we identified the secreted frizzled-related protein 1, 2 and 3 ( SFRP1, SFRP2 and SFRP3 ) family of WNT inhibitors as putative tumor sup...

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Veröffentlicht in:Oncogene 2010-05, Vol.29 (20), p.3017-3024
Hauptverfasser: Kongkham, P N, Northcott, P A, Croul, S E, Smith, C A, Taylor, M D, Rutka, J T
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container_issue 20
container_start_page 3017
container_title Oncogene
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creator Kongkham, P N
Northcott, P A
Croul, S E
Smith, C A
Taylor, M D
Rutka, J T
description Medulloblastoma (MB) is the most common malignant pediatric brain tumor. Dysregulation of WNT signaling occurs in up to 20% of cases. Using a genome-wide approach, we identified the secreted frizzled-related protein 1, 2 and 3 ( SFRP1, SFRP2 and SFRP3 ) family of WNT inhibitors as putative tumor suppressor genes silenced by promoter region methylation in MB. SFRP1, SFRP2 and SFRP3 expression increased after 5-aza-2′-deoxycytidine treatment. SFRP1 , SFRP2 and SFRP3 methylation was identified in 23.5, 3.9 and 15.7% of primary MB specimens, respectively, by methylation-specific PCR. Stable SFRP1, SFRP2 and SFRP3 expression reduced phospho-DVL2 levels and hindered MB cell proliferation and colony formation in soft agar in vitro . In 60% of primary tumors, SFRP1 was expressed at levels twofold lower than that in normal cerebellum. SFRP1 expression impaired tumor formation in vivo in flank and orthotopic intracerebellar xenograft models and conferred a significant survival advantage ( P
doi_str_mv 10.1038/onc.2010.32
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Dysregulation of WNT signaling occurs in up to 20% of cases. Using a genome-wide approach, we identified the secreted frizzled-related protein 1, 2 and 3 ( SFRP1, SFRP2 and SFRP3 ) family of WNT inhibitors as putative tumor suppressor genes silenced by promoter region methylation in MB. SFRP1, SFRP2 and SFRP3 expression increased after 5-aza-2′-deoxycytidine treatment. SFRP1 , SFRP2 and SFRP3 methylation was identified in 23.5, 3.9 and 15.7% of primary MB specimens, respectively, by methylation-specific PCR. Stable SFRP1, SFRP2 and SFRP3 expression reduced phospho-DVL2 levels and hindered MB cell proliferation and colony formation in soft agar in vitro . In 60% of primary tumors, SFRP1 was expressed at levels twofold lower than that in normal cerebellum. SFRP1 expression impaired tumor formation in vivo in flank and orthotopic intracerebellar xenograft models and conferred a significant survival advantage ( P &lt;0.0001). We identify for the first time tumor suppressor gene function of SFRP genes in MB, and suggest that loss of WNT pathway inhibition due to SFRP gene silencing is an additional mechanism that may contribute to excessive WNT signaling in this disease.</description><identifier>ISSN: 0950-9232</identifier><identifier>EISSN: 1476-5594</identifier><identifier>DOI: 10.1038/onc.2010.32</identifier><identifier>PMID: 20208569</identifier><identifier>CODEN: ONCNES</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>631/208/176/2016 ; 631/67/1922 ; 631/67/581 ; 631/80/86 ; Adaptor Proteins, Signal Transducing - antagonists &amp; inhibitors ; Adaptor Proteins, Signal Transducing - genetics ; Adaptor Proteins, Signal Transducing - metabolism ; Animals ; Apoptosis ; Biological and medical sciences ; Brain cancer ; Brain tumors ; Cell Biology ; Cell Line, Tumor ; Cell physiology ; Cell proliferation ; Cell transformation and carcinogenesis. Action of oncogenes and antioncogenes ; Cellular signal transduction ; Cerebellum ; Cerebellum - metabolism ; Cerebellum - pathology ; Dishevelled protein ; Dishevelled Proteins ; DNA Methylation ; Frizzled protein ; Frizzled-related protein ; Frizzled-related protein 1 ; Fundamental and applied biological sciences. Psychology ; Gene expression ; Gene Expression Regulation, Neoplastic ; Gene Silencing ; Genes ; Genes, Tumor Suppressor - physiology ; Genetic aspects ; Genomes ; Genomics ; Glycoproteins - genetics ; Glycoproteins - metabolism ; Health aspects ; Human Genetics ; Humans ; Intercellular Signaling Peptides and Proteins - genetics ; Intercellular Signaling Peptides and Proteins - metabolism ; Internal Medicine ; Medical sciences ; Medicine ; Medicine &amp; Public Health ; Medulloblastoma ; Medulloblastoma - genetics ; Medulloblastoma - metabolism ; Medulloblastoma - pathology ; Membrane Proteins - genetics ; Membrane Proteins - metabolism ; Mice ; Mice, Nude ; Molecular and cellular biology ; Neurology ; Oncology ; Pediatrics ; Phosphoproteins - antagonists &amp; inhibitors ; Phosphoproteins - genetics ; Phosphoproteins - metabolism ; Phosphorylation ; Physiological aspects ; Promoter Regions, Genetic ; Proteins ; Risk factors ; short-communication ; Signal transduction ; Survival Rate ; Tumor suppressor genes ; Tumors of the nervous system. 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Dysregulation of WNT signaling occurs in up to 20% of cases. Using a genome-wide approach, we identified the secreted frizzled-related protein 1, 2 and 3 ( SFRP1, SFRP2 and SFRP3 ) family of WNT inhibitors as putative tumor suppressor genes silenced by promoter region methylation in MB. SFRP1, SFRP2 and SFRP3 expression increased after 5-aza-2′-deoxycytidine treatment. SFRP1 , SFRP2 and SFRP3 methylation was identified in 23.5, 3.9 and 15.7% of primary MB specimens, respectively, by methylation-specific PCR. Stable SFRP1, SFRP2 and SFRP3 expression reduced phospho-DVL2 levels and hindered MB cell proliferation and colony formation in soft agar in vitro . In 60% of primary tumors, SFRP1 was expressed at levels twofold lower than that in normal cerebellum. SFRP1 expression impaired tumor formation in vivo in flank and orthotopic intracerebellar xenograft models and conferred a significant survival advantage ( P &lt;0.0001). 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Action of oncogenes and antioncogenes</subject><subject>Cellular signal transduction</subject><subject>Cerebellum</subject><subject>Cerebellum - metabolism</subject><subject>Cerebellum - pathology</subject><subject>Dishevelled protein</subject><subject>Dishevelled Proteins</subject><subject>DNA Methylation</subject><subject>Frizzled protein</subject><subject>Frizzled-related protein</subject><subject>Frizzled-related protein 1</subject><subject>Fundamental and applied biological sciences. 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Dysregulation of WNT signaling occurs in up to 20% of cases. Using a genome-wide approach, we identified the secreted frizzled-related protein 1, 2 and 3 ( SFRP1, SFRP2 and SFRP3 ) family of WNT inhibitors as putative tumor suppressor genes silenced by promoter region methylation in MB. SFRP1, SFRP2 and SFRP3 expression increased after 5-aza-2′-deoxycytidine treatment. SFRP1 , SFRP2 and SFRP3 methylation was identified in 23.5, 3.9 and 15.7% of primary MB specimens, respectively, by methylation-specific PCR. Stable SFRP1, SFRP2 and SFRP3 expression reduced phospho-DVL2 levels and hindered MB cell proliferation and colony formation in soft agar in vitro . In 60% of primary tumors, SFRP1 was expressed at levels twofold lower than that in normal cerebellum. SFRP1 expression impaired tumor formation in vivo in flank and orthotopic intracerebellar xenograft models and conferred a significant survival advantage ( P &lt;0.0001). We identify for the first time tumor suppressor gene function of SFRP genes in MB, and suggest that loss of WNT pathway inhibition due to SFRP gene silencing is an additional mechanism that may contribute to excessive WNT signaling in this disease.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>20208569</pmid><doi>10.1038/onc.2010.32</doi><tpages>8</tpages></addata></record>
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subjects 631/208/176/2016
631/67/1922
631/67/581
631/80/86
Adaptor Proteins, Signal Transducing - antagonists & inhibitors
Adaptor Proteins, Signal Transducing - genetics
Adaptor Proteins, Signal Transducing - metabolism
Animals
Apoptosis
Biological and medical sciences
Brain cancer
Brain tumors
Cell Biology
Cell Line, Tumor
Cell physiology
Cell proliferation
Cell transformation and carcinogenesis. Action of oncogenes and antioncogenes
Cellular signal transduction
Cerebellum
Cerebellum - metabolism
Cerebellum - pathology
Dishevelled protein
Dishevelled Proteins
DNA Methylation
Frizzled protein
Frizzled-related protein
Frizzled-related protein 1
Fundamental and applied biological sciences. Psychology
Gene expression
Gene Expression Regulation, Neoplastic
Gene Silencing
Genes
Genes, Tumor Suppressor - physiology
Genetic aspects
Genomes
Genomics
Glycoproteins - genetics
Glycoproteins - metabolism
Health aspects
Human Genetics
Humans
Intercellular Signaling Peptides and Proteins - genetics
Intercellular Signaling Peptides and Proteins - metabolism
Internal Medicine
Medical sciences
Medicine
Medicine & Public Health
Medulloblastoma
Medulloblastoma - genetics
Medulloblastoma - metabolism
Medulloblastoma - pathology
Membrane Proteins - genetics
Membrane Proteins - metabolism
Mice
Mice, Nude
Molecular and cellular biology
Neurology
Oncology
Pediatrics
Phosphoproteins - antagonists & inhibitors
Phosphoproteins - genetics
Phosphoproteins - metabolism
Phosphorylation
Physiological aspects
Promoter Regions, Genetic
Proteins
Risk factors
short-communication
Signal transduction
Survival Rate
Tumor suppressor genes
Tumors of the nervous system. Phacomatoses
Wnt protein
Wnt Proteins - metabolism
Xenograft Model Antitumor Assays
Xenografts
title The SFRP family of WNT inhibitors function as novel tumor suppressor genes epigenetically silenced in medulloblastoma
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