c-Jun amplification and overexpression are oncogenic in liposarcoma but not always sufficient to inhibit the adipocytic differentiation programme

Genomic amplification of c-Jun and its upstream kinases have been implicated as a mechanism of progression from well-differentiated to dedifferentiated liposarcoma. To further define the role of c-Jun in liposarcoma progression, we performed immunohistochemistry for c-Jun and its activating kinase A...

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Veröffentlicht in:The Journal of pathology 2009-07, Vol.218 (3), p.292-300
Hauptverfasser: Snyder, Eric L, Sandstrom, Deborah J, Law, Kenneth, Fiore, Christopher, Sicinska, Ewa, Brito, Joseph, Bailey, Dyane, Fletcher, Jonathan A, Loda, Massimo, Rodig, Scott J, Dal Cin, Paola, Fletcher, Christopher DM
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container_issue 3
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container_title The Journal of pathology
container_volume 218
creator Snyder, Eric L
Sandstrom, Deborah J
Law, Kenneth
Fiore, Christopher
Sicinska, Ewa
Brito, Joseph
Bailey, Dyane
Fletcher, Jonathan A
Loda, Massimo
Rodig, Scott J
Dal Cin, Paola
Fletcher, Christopher DM
description Genomic amplification of c-Jun and its upstream kinases have been implicated as a mechanism of progression from well-differentiated to dedifferentiated liposarcoma. To further define the role of c-Jun in liposarcoma progression, we performed immunohistochemistry for c-Jun and its activating kinase ASK1 on a series of liposarcomas (n = 81). We correlated the results with fluorescence in situ hybridization to detect c-Jun amplification. We also derived new cell lines from dedifferentiated liposarcomas with c-Jun amplification. c-Jun protein is expressed in the majority of dedifferentiated liposarcomas (91%) and their well-differentiated components (59%), but only in the minority of pure well-differentiated liposarcomas (27%). When c-Jun is amplified in dedifferentiated liposarcoma, it is interspersed with amplified MDM2 on ring and giant marker chromosomes. MDM2 amplification is one of the earliest events in liposarcoma development, and these results suggest that c-Jun was amplified at a similar time in the evolution of the tumour. In addition, shRNA to c-Jun in c-Jun-amplified liposarcoma cells reduces cell number in vitro and inhibits tumour formation in vivo without an observable effect on the differentiation state of the liposarcoma cells. Thus, c-Jun amplification is oncogenic in liposarcomas but not always sufficient for inhibition of adipocytic differentiation. Copyright © 2009 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
doi_str_mv 10.1002/path.2564
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To further define the role of c-Jun in liposarcoma progression, we performed immunohistochemistry for c-Jun and its activating kinase ASK1 on a series of liposarcomas (n = 81). We correlated the results with fluorescence in situ hybridization to detect c-Jun amplification. We also derived new cell lines from dedifferentiated liposarcomas with c-Jun amplification. c-Jun protein is expressed in the majority of dedifferentiated liposarcomas (91%) and their well-differentiated components (59%), but only in the minority of pure well-differentiated liposarcomas (27%). When c-Jun is amplified in dedifferentiated liposarcoma, it is interspersed with amplified MDM2 on ring and giant marker chromosomes. MDM2 amplification is one of the earliest events in liposarcoma development, and these results suggest that c-Jun was amplified at a similar time in the evolution of the tumour. In addition, shRNA to c-Jun in c-Jun-amplified liposarcoma cells reduces cell number in vitro and inhibits tumour formation in vivo without an observable effect on the differentiation state of the liposarcoma cells. Thus, c-Jun amplification is oncogenic in liposarcomas but not always sufficient for inhibition of adipocytic differentiation. Copyright © 2009 Pathological Society of Great Britain and Ireland. 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Pathol</addtitle><description>Genomic amplification of c-Jun and its upstream kinases have been implicated as a mechanism of progression from well-differentiated to dedifferentiated liposarcoma. To further define the role of c-Jun in liposarcoma progression, we performed immunohistochemistry for c-Jun and its activating kinase ASK1 on a series of liposarcomas (n = 81). We correlated the results with fluorescence in situ hybridization to detect c-Jun amplification. We also derived new cell lines from dedifferentiated liposarcomas with c-Jun amplification. c-Jun protein is expressed in the majority of dedifferentiated liposarcomas (91%) and their well-differentiated components (59%), but only in the minority of pure well-differentiated liposarcomas (27%). When c-Jun is amplified in dedifferentiated liposarcoma, it is interspersed with amplified MDM2 on ring and giant marker chromosomes. 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Published by John Wiley &amp; Sons, Ltd.</description><subject>Adipocytes - pathology</subject><subject>Animals</subject><subject>Biological and medical sciences</subject><subject>c-Jun</subject><subject>c-Jun protein</subject><subject>Cell Differentiation - physiology</subject><subject>Cell Line, Tumor</subject><subject>Cell number</subject><subject>Chromosomes</subject><subject>dedifferentiation</subject><subject>Dermatology</subject><subject>Differentiation</subject><subject>Disease Progression</subject><subject>Evolution</subject><subject>Fluorescence in situ hybridization</subject><subject>Gene Amplification</subject><subject>Genes, jun</subject><subject>genomics</subject><subject>Humans</subject><subject>Immunohistochemistry</subject><subject>In Situ Hybridization, Fluorescence</subject><subject>Investigative techniques, diagnostic techniques (general aspects)</subject><subject>Liposarcoma</subject><subject>Liposarcoma - genetics</subject><subject>Liposarcoma - metabolism</subject><subject>Liposarcoma - pathology</subject><subject>MAP kinase</subject><subject>MAP Kinase Kinase Kinase 5 - metabolism</subject><subject>MDM2 protein</subject><subject>Medical sciences</subject><subject>Mice</subject><subject>Mice, Nude</subject><subject>Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques</subject><subject>Proto-Oncogene Proteins c-jun - metabolism</subject><subject>Transcription factors</subject><subject>Tumors of the skin and soft tissue. 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Pathol</addtitle><date>2009-07</date><risdate>2009</risdate><volume>218</volume><issue>3</issue><spage>292</spage><epage>300</epage><pages>292-300</pages><issn>0022-3417</issn><eissn>1096-9896</eissn><coden>JPTLAS</coden><abstract>Genomic amplification of c-Jun and its upstream kinases have been implicated as a mechanism of progression from well-differentiated to dedifferentiated liposarcoma. To further define the role of c-Jun in liposarcoma progression, we performed immunohistochemistry for c-Jun and its activating kinase ASK1 on a series of liposarcomas (n = 81). We correlated the results with fluorescence in situ hybridization to detect c-Jun amplification. We also derived new cell lines from dedifferentiated liposarcomas with c-Jun amplification. c-Jun protein is expressed in the majority of dedifferentiated liposarcomas (91%) and their well-differentiated components (59%), but only in the minority of pure well-differentiated liposarcomas (27%). 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subjects Adipocytes - pathology
Animals
Biological and medical sciences
c-Jun
c-Jun protein
Cell Differentiation - physiology
Cell Line, Tumor
Cell number
Chromosomes
dedifferentiation
Dermatology
Differentiation
Disease Progression
Evolution
Fluorescence in situ hybridization
Gene Amplification
Genes, jun
genomics
Humans
Immunohistochemistry
In Situ Hybridization, Fluorescence
Investigative techniques, diagnostic techniques (general aspects)
Liposarcoma
Liposarcoma - genetics
Liposarcoma - metabolism
Liposarcoma - pathology
MAP kinase
MAP Kinase Kinase Kinase 5 - metabolism
MDM2 protein
Medical sciences
Mice
Mice, Nude
Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques
Proto-Oncogene Proteins c-jun - metabolism
Transcription factors
Tumors of the skin and soft tissue. Premalignant lesions
title c-Jun amplification and overexpression are oncogenic in liposarcoma but not always sufficient to inhibit the adipocytic differentiation programme
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