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Kostrzewska-Poczekaj M, Byzia E, Soloch N, Jarmuz-Szymczak M, Janiszewska J, Kowal E, Paczkowska J, Kiwerska K, Wierzbicka M, Bartochowska A, Ustaszewski A, Greczka G, Grenman R, Szyfter K, Giefing M. DIAPH2 alterations increase cellular motility and may contribute to the metastatic potential of laryngeal squamous cell carcinoma. Carcinogenesis 2020; 40:1251-1259. [PMID: 30793164 DOI: 10.1093/carcin/bgz035] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 01/30/2019] [Accepted: 02/20/2019] [Indexed: 02/06/2023] Open
Abstract
Low 5-year survival rate in laryngeal squamous cell carcinoma (LSCC) is to large extent attributable to high rate of recurrences and metastases. Despite the importance of the latter process, its complex genetic background remains not fully understood. Recently, we identified two metastasis-related candidate genes, DIAPH2 and DIAPH3 to be frequently targeted by hemizygous/homozygous deletions, respectively, in LSCC cell lines. They physiologically regulate such processes as cell movement and adhesion, hence we found it as a rationale, to study if tumor LSCC specimens harbor mutations of these genes and whether the mutations are associated with metastasizing tumors. As a proof of concept, we sequenced both genes in five LSCC cell lines derived from lymph node metastases assuming there the highest probability of finding alterations. Indeed, we identified one hemizygous deletion (c.3116_3240del125) in DIAPH2 targeting the FH2 domain. Moreover, we analyzed 95 LSCC tumors (53 N0 and 42 N+) using the Illumina platform and identified three heterozygous single nucleotide variants in DIAPH2 targeting conserved domains exclusively in N+ tumors. By combining these results with cBioPortal data we showed significant enrichment of DIAPH2 mutations (P = 0.036) in N+ tumors. To demonstrate the consequences of DIAPH2 inactivation, CRISPR/Cas9 editing was used to obtain a heterozygous DIAPH2+/- mutant HEK-293T cell line. Importantly, the edited line shows a shift from 'proliferation' to 'migration' phenotype typically observed in metastasizing cells. In conclusion, we report that DIAPH2 alterations are present primarily in metastasizing specimens of LSCC and suggest that they may contribute to the metastatic potential of the tumor.
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Affiliation(s)
| | - E Byzia
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - N Soloch
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - M Jarmuz-Szymczak
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland.,Department of Hematology and Bone Marrow Transplantation, Poznan University of Medical Sciences, Poznan, Poland
| | - J Janiszewska
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - E Kowal
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - J Paczkowska
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - K Kiwerska
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland.,Department of Tumor Pathology, Greater Poland Cancer Center, Poznan, Poland
| | - M Wierzbicka
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland.,Department of Otolaryngology and Laryngological Oncology, Poznan University of Medical Sciences, Poznan, Poland
| | - A Bartochowska
- Department of Otolaryngology and Laryngological Oncology, Poznan University of Medical Sciences, Poznan, Poland
| | - A Ustaszewski
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - G Greczka
- Department of Otolaryngology and Laryngological Oncology, Poznan University of Medical Sciences, Poznan, Poland
| | - R Grenman
- Department of Otorhinolaryngology-Head and Neck Surgery, Turku University Central Hospital and Turku University, Turku, Finland
| | - K Szyfter
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - M Giefing
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland.,Department of Otolaryngology and Laryngological Oncology, Poznan University of Medical Sciences, Poznan, Poland
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2
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Janiszewska J, Bodnar M, Kostrzewska-Poczekaj M, Bednarek K, Paczkowska J, Greenam R, Szyfter K, Wierzbicka M, Jarmuz-Szymczak M, Giefing M. PO-380 Epigenetically regulated MAF is a new potential tumour suppressor gene in LSCC. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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3
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Wurster KD, Hummel F, Richter J, Giefing M, Hartmann S, Hansmann ML, Kreher S, Köchert K, Krappmann D, Klapper W, Hummel M, Wenzel SS, Lenz G, Janz M, Dörken B, Siebert R, Mathas S. Inactivation of the putative ubiquitin-E3 ligase PDLIM2 in classical Hodgkin and anaplastic large cell lymphoma. Leukemia 2016; 31:602-613. [PMID: 27538486 PMCID: PMC5339435 DOI: 10.1038/leu.2016.238] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 08/02/2016] [Accepted: 08/09/2016] [Indexed: 12/12/2022]
Abstract
Apart from its unique histopathological appearance with rare tumor cells embedded in an inflammatory background of bystander cells, classical Hodgkin lymphoma (cHL) is characterized by an unusual activation of a broad range of signaling pathways involved in cellular activation. This includes constitutive high-level activity of nuclear factor-κB (NF-κB), Janus kinase/signal transducer and activator of transcription (JAK/STAT), activator protein-1 (AP-1) and interferon regulatory factor (IRF) transcription factors (TFs) that are physiologically only transiently activated. Here, we demonstrate that inactivation of the putative ubiquitin E3-ligase PDLIM2 contributes to this TF activation. PDLIM2 expression is lost at the mRNA and protein levels in the majority of cHL cell lines and Hodgkin and Reed–Sternberg (HRS) cells of nearly all cHL primary samples. This loss is associated with PDLIM2 genomic alterations, promoter methylation and altered splicing. Reconstitution of PDLIM2 in HRS cell lines inhibits proliferation, blocks NF-κB transcriptional activity and contributes to cHL-specific gene expression. In non-Hodgkin B-cell lines, small interfering RNA-mediated PDLIM2 knockdown results in superactivation of TFs NF-κB and AP-1 following phorbol 12-myristate 13-acetate (PMA) stimulation. Furthermore, expression of PDLIM2 is lost in anaplastic large cell lymphoma (ALCL) that shares key biological aspects with cHL. We conclude that inactivation of PDLIM2 is a recurrent finding in cHL and ALCL, promotes activation of inflammatory signaling pathways and thereby contributes to their pathogenesis.
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Affiliation(s)
- K D Wurster
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany.,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - F Hummel
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany.,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - J Richter
- Institute of Human Genetics, Christian-Albrechts University Kiel, Kiel, Germany
| | - M Giefing
- Institute of Human Genetics, Christian-Albrechts University Kiel, Kiel, Germany.,Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland
| | - S Hartmann
- Dr Senckenberg Institute of Pathology, University of Frankfurt, Medical School, Frankfurt, Germany
| | - M-L Hansmann
- Dr Senckenberg Institute of Pathology, University of Frankfurt, Medical School, Frankfurt, Germany
| | - S Kreher
- Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - K Köchert
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany.,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - D Krappmann
- Research Unit Cellular Signal Integration, Helmholtz Zentrum München für Gesundheit und Umwelt, Neuherberg, Germany
| | - W Klapper
- Department of Pathology, Haematopathology Section and Lymph Node Registry, Christian-Albrechts University Kiel, Kiel, Germany
| | - M Hummel
- Institute of Pathology, Charité-Universitätsmedzin Berlin, Berlin, Germany
| | - S-S Wenzel
- Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - G Lenz
- Division of Translational Oncology, Department of Medicine A, University Hospital Münster, and Cluster of Excellence EXC 1003, Cells in Motion, Münster, Germany
| | - M Janz
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany.,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - B Dörken
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany.,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany.,German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - R Siebert
- Institute of Human Genetics, Christian-Albrechts University Kiel, Kiel, Germany.,Institute of Human Genetics, University Hospital Ulm, Ulm, Germany
| | - S Mathas
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany.,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany.,German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg, Germany
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4
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Giefing M, Byzia E, Zemke N, Kiwerska K, Kostrzewska-Poczekaj M, Jarmuz-Szymczak M, Wierzbicka M, Greczka G, Grenman R, Szyfter K. Next generation sequencing in laryngeal cancer specimens reveals alterations of the DIAPH2 gene that can putatively contribute to the metastatic potential of squamous carcinoma. Eur J Cancer 2016. [DOI: 10.1016/s0959-8049(16)61161-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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Bednarek K, Kiwerska K, Szaumkessel M, Bodnar M, Kostrzewska-Poczekaj M, Marszalek A, Janiszewska J, Bartochowska A, Jackowska J, Wierzbicka M, Grenman R, Szyfter K, Giefing M, Jarmuz-Szymczak M. Recurrent CDK1 overexpression in laryngeal squamous cell carcinoma. Tumour Biol 2016; 37:11115-26. [PMID: 26912061 PMCID: PMC4999469 DOI: 10.1007/s13277-016-4991-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 02/11/2016] [Indexed: 12/12/2022] Open
Abstract
In this study, we analyzed the expression profile of four genes (CCNA2, CCNB1, CCNB2, and CDK1) in laryngeal squamous cell carcinoma (LSCC) cell lines and tumor samples. With the application of microarray platform, we have shown the overexpression of these genes in all analyzed LSCC samples in comparison to non-cancer controls from head and neck region. We have selected CDK1 for further analysis, due to its leading role in cell cycle regulation. It is a member of the Ser/Thr protein kinase family of proven oncogenic properties. The results obtained for CDK1 were further confirmed with the application of reverse transcription quantitative polymerase chain reaction (RT-qPCR) technique, Western blot, and immunohistochemistry (IHC). The observed upregulation of CDK1 in laryngeal squamous cell carcinoma has encouraged us to analyze for genetic mechanisms that can be responsible this phenomenon. Therefore, with the application of array-CGH, sequencing analysis and two methods for epigenetic regulation analysis (DNA methylation and miRNA expression), we tried to identify such potential mechanisms. Our attempts to identify the molecular mechanisms responsible for observed changes failed as we did not observe significant alterations neither in the DNA sequence nor in the gene copy number that could underline CDK1 upregulation. Similarly, the pyrosequencing and miRNA expression analyses did not reveal any differences in methylation level and miRNA expression, respectively; thus, these mechanisms probably do not contribute to elevation of CDK1 expression in LSCC. However, our results suggest that alteration of CDK1 expression on both mRNA and protein level probably appears on the very early step of carcinogenesis.
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Affiliation(s)
- K Bednarek
- Department of Cancer Genetics, Institute of Human Genetics, PAS, Poznan, Poland
| | - K Kiwerska
- Department of Cancer Genetics, Institute of Human Genetics, PAS, Poznan, Poland
| | - M Szaumkessel
- Department of Cancer Genetics, Institute of Human Genetics, PAS, Poznan, Poland
| | - M Bodnar
- Department of Clinical Pathomorphology, Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland
| | | | - A Marszalek
- Department of Clinical Pathomorphology, Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland.,Department of Oncologic Pathology, Greater Poland Cancer Centre, Poznan, Poland
| | - J Janiszewska
- Department of Cancer Genetics, Institute of Human Genetics, PAS, Poznan, Poland
| | - A Bartochowska
- Department of Otolaryngology and Laryngological Oncology, University of Medical Sciences, Poznan, Poland
| | - J Jackowska
- Department of Otolaryngology and Laryngological Oncology, University of Medical Sciences, Poznan, Poland
| | - M Wierzbicka
- Department of Otolaryngology and Laryngological Oncology, University of Medical Sciences, Poznan, Poland
| | - R Grenman
- Department of Otorhinolaryngology-Head and Neck Surgery and Department of Medical Biochemistry, Turku University Hospital and University of Turku, Turku, Finland
| | - K Szyfter
- Department of Audiology and Phoniatry, University of Medical Sciences, Poznan, Poland
| | - M Giefing
- Department of Cancer Genetics, Institute of Human Genetics, PAS, Poznan, Poland.,Department of Otolaryngology and Laryngological Oncology, University of Medical Sciences, Poznan, Poland
| | - M Jarmuz-Szymczak
- Department of Cancer Genetics, Institute of Human Genetics, PAS, Poznan, Poland. .,Department of Hematology, University of Medical Sciences, Poznan, Poland.
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6
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Szyfter K, Bednarek K, Bodnar M, Kostrzewska-Poczekaj M, Grenman R, Jarmuz-Szymczak M, Marszalek A, Giefing M. 466: Potential oncogenic activity of CDK1 gene in laryngeal squamous cell carcinoma. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)50417-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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7
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Byzia E, Szaumkessel M, Kiwerska K, Kostrzewska-Poczekaj M, Jarmuz-Szymczak M, Zemke N, Grenman R, Szyfter K, Giefing M. 448: Promoter hypermethylation and overexpression of putative oncomiRs may contribute to silencing of the tumor suppressor gene PCDH17 in laryngeal squamous cell carcinoma. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)50400-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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8
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Baudis M, Giefing M, Cai H, Kumar N, Vater I, Richter J, Siebert R. Array-basierter Nachweis chromosomaler Aberrationen bei malignen Neoplasien. MED GENET-BERLIN 2012. [DOI: 10.1007/s11825-012-0328-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Zusammenfassung
Array-basierte Methoden zum Nachweis chromsomaler Imbalancen haben in der vergangenen Dekade zunehmende Bedeutung in der tumorgenetischen Analytik gewonnen. Dabei werden im Wesentlichen auf Array-CGH („comparative genomic hybridization“) und SNP(Single-nucleotide-polymorphism)-Array basierte Technologien unterschieden, die je nach Fragestellung, Ausgangsmaterial und gewünschter Auflösung Vor- und Nachteile haben. So erlauben SNP-basierte Methoden im Gegensatz zum klassischen Array-CGH-Ansatz den gleichzeitigen Nachweis von chromosomalen Imbalancen und von Verlust der Heterozygotie ohne Veränderung der Kopienzahl („copy-neutral loss of heterozygosity“, CN-LOH). Bei allen Array-basierten Analysen von Tumoren ist zu beachten, dass im Gegensatz zu den Analysen zum Nachweis konstitutioneller Veränderungen zumeist nicht alle untersuchten Zellen dem neoplastischen Klon oder einem chromosomal aberranten Subklon angehören. Einsatzgebiete von Array-basierten Technologien bei Tumoren sind z. B. die Charakterisierung pathogenetisch relevanter Imbalancen, die Definition von molekularen und klinischen Subgruppen von Tumoren oder die Identifizierung von Targets für eine individualisierte Therapie.
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Affiliation(s)
- M. Baudis
- Aff1_328 grid.7400.3 0000000419370650 Institut für Molekulare Biologie Universität Zürich Zürich Schweiz
| | - M. Giefing
- Aff2_328 grid.412468.d 0000000406462097 Institut für Humangenetik Christian-Albrechts-Universität zu Kiel & Universitätsklinikum Schleswig-Holstein, Campus Kiel Schwanenweg 24 24105 Kiel Deutschland
- Aff3_328 Institut für Humangenetik Polnische Akademie der Wissenschaften Posen Polen
| | - H. Cai
- Aff1_328 grid.7400.3 0000000419370650 Institut für Molekulare Biologie Universität Zürich Zürich Schweiz
| | - N. Kumar
- Aff1_328 grid.7400.3 0000000419370650 Institut für Molekulare Biologie Universität Zürich Zürich Schweiz
| | - I. Vater
- Aff2_328 grid.412468.d 0000000406462097 Institut für Humangenetik Christian-Albrechts-Universität zu Kiel & Universitätsklinikum Schleswig-Holstein, Campus Kiel Schwanenweg 24 24105 Kiel Deutschland
| | - J. Richter
- Aff2_328 grid.412468.d 0000000406462097 Institut für Humangenetik Christian-Albrechts-Universität zu Kiel & Universitätsklinikum Schleswig-Holstein, Campus Kiel Schwanenweg 24 24105 Kiel Deutschland
| | - R. Siebert
- Aff2_328 grid.412468.d 0000000406462097 Institut für Humangenetik Christian-Albrechts-Universität zu Kiel & Universitätsklinikum Schleswig-Holstein, Campus Kiel Schwanenweg 24 24105 Kiel Deutschland
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9
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Ammerpohl O, Haake A, Pellissery S, Giefing M, Richter J, Balint B, Kulis M, Le J, Bibikova M, Drexler HG, Seifert M, Shaknovic R, Korn B, Küppers R, Martín-Subero JI, Siebert R. Array-based DNA methylation analysis in classical Hodgkin lymphoma reveals new insights into the mechanisms underlying silencing of B cell-specific genes. Leukemia 2011; 26:185-8. [DOI: 10.1038/leu.2011.194] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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10
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Rydzanicz M, Giefing M, Ziolkowski A, Kasprzyk M, Gabriel A, Dyszkiewicz W, Szyfter K. Nonrandom DNA copy number changes related to lymph node metastases in squamous cell carcinoma of the lung. Neoplasma 2008; 55:493-500. [PMID: 18999877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Lung cancer is one of the most common malignancies and cancer-related death worldwide. Lymph node metastasis is the main cause of treatment failure. Although many studies were performed to evaluate genetic events associated with development and progression of lung cancer, molecular mechanism still remains poorly defined. In the present study, using comparative genomic hybridization (CGH) technique, we described the pattern of DNA copy number changes in a cohort of 42 primary squamous cell carcinomas (SCC) of the lung. A direct comparison of nonmetastatic (TxN0M0) and metastatic (TxN1-2M0) tumors was performed to define chromosomal imbalances related to lymph node metastases. Some genetic alterations were observed more frequently in metastatic than in non-metastatic tumors, including losses at 11q, 16p, 16q, 19p and gains at 4q, 7q, 12p, 13q, 18p. The gain at 7q with the smallest common altered region 7q31.2-q32, was found to be directly associated with lymph node involvement (p=0.0407). We suggest that the established chromosomal region harbors two putative tumor suppressor genes WNT2 and c-Met. An overexpresion of these genes seems to be involved in inducing the invasive growth and metastatic potential of SCC of the lung.
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Affiliation(s)
- M Rydzanicz
- Institute of Human Genetics Polish Academy of Sciences, Poznań, Poland.
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11
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Giefing M, Wierzbicka M, Rydzanicz M, Cegla R, Kujawski M, Szyfter K. Chromosomal gains and losses indicate oncogene and tumor suppressor gene candidates in salivary gland tumors. Neoplasma 2008; 55:55-60. [PMID: 18190242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The incidence of salivary gland tumor in Poland is growing in the last two decades. Simultaneously a progress in understanding the genetic mechanisms of formation of this tumor was achieved by detecting several genes like PLAG1 involved in its pathogenesis. In this study we perform a whole genome, CGH analysis with the aim to identify recurrent, chromosomal copy number changes possibly indicating novel tumor suppressor gene or oncogene loci. 29 salivary tumor samples: Cystadenolymphoma-warthin (15) and adenoma polymorphum (14) located in the parotid (27) and submandibular gland (2) were collected and CGH was performed. The established copy number profiles were compared in order to asses the smallest common region of gains and losses. The delineated regions were further analyzed with the UCSC Genome Browser on Human Mar. 2006 Assembly to asses their gene content. Altogether, salivary gland tumors presented a different aberration pattern than these reported for head and neck squamous cell carcinoma (HNSCC) but no significant differences were observed between Warthin and adenoma polymorphum tumors. Moreover, several potential tumor suppressor genes and oncogenes were identified in the smallest, common altered regions. We show a frequent deletion of the harakiri gene (12q24.2) in 12/29 tumors and TP53 gene (17p13.1) in 11/29 tumors as potential tumor suppressors in salivary gland cancers. Besides, we detected a frequent amplification of the 13q22.1-22.2 region in 13/29 cases harboring the KLF5 and KLF12 genes. KLF5 regulates the expression of survivin, an oncogene widely expressed in the majority of human cancers. The observed alterations may indicate important genetic events in the formation of salivary gland tumors. Especially the amplification in 13q may be a mechanism contributing to the expression of survivin and tumor progression.
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Affiliation(s)
- M Giefing
- Institute of Human Genetics, Polish Academy of Sciences, Poznan, Poland.
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12
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Giefing M, Rydzanicz M, Szukala K, Wozniak A, Wierzbicka M, Szyfter K, Kujawski M. Second primary tumors (SPT) of head and neck: distinguishing of "true" SPT from micrometastasis by LOH analysis of selected chromosome regions. Neoplasma 2005; 52:374-80. [PMID: 16151577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The reason of treatment failures in head and neck tumors is often connected with the appearance of second primary tumors (SPT). Three mechanisms of SPT development of clonal or non clonal secondary tumors were described: 1. via micrometastases (clonal); 2. from a common carcinogenic field - Second Field Tumors (SFT - partially clonal); 3. via independent events (from different carcinogenic fields - "true" SPT - not clonal). Assessing the clonality of diagnosed tumors carries important clinical implications including chemoprevention, radiotherapy and general patient management. In this study a set of 12 microsatellite markers was used to find similarities and/or differences in allelic imbalance patterns between 22 pairs of tumors (the first tumor designate as index and SPT). The aim of the study was to identify a potential clonal origin and progression within given pairs of tumors. The results indicate that within the tumors diagnosed by clinical examination as SPT at least two mechanisms mentioned above should be taken into account as 6/23 (26%) were clonally unrelated ("true" SPT) and 3/23 (13%) carried clonal genetic changes (formation by micrometastasis or SFT). In 14/23 (61%) cases the results were insufficient or ambiguous to determine the clonality status. The final results indicate the complexity of carcinogenesis in these tumors and thus stress that clinical diagnosis of second primary tumors should be considered carefully.
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Affiliation(s)
- M Giefing
- Institute of Human Genetics, Polish Academy of Sciences, 60-479 Poznan, Poland.
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