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The Tumor Suppressive mir-148a Is Epigenetically Inactivated in Classical Hodgkin Lymphoma. Cells 2020; 9:cells9102292. [PMID: 33066457 PMCID: PMC7602210 DOI: 10.3390/cells9102292] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 10/11/2020] [Accepted: 10/11/2020] [Indexed: 01/06/2023] Open
Abstract
DNA methylation was shown previously to be a crucial mechanism responsible for transcriptional deregulation in the pathogenesis of classical Hodgkin lymphoma (cHL). To identify epigenetically inactivated miRNAs in cHL, we have analyzed the set of miRNAs downregulated in cHL cell lines using bisulfite pyrosequencing. We focused on miRNAs with promoter regions located within or <1000 bp from a CpG island. Most promising candidate miRNAs were further studied in primary Hodgkin and Reed-Sternberg (HRS) cells obtained by laser capture microdissection. Last, to evaluate the function of identified miRNAs, we performed a luciferase reporter assay to confirm miRNA: mRNA interactions and therefore established cHL cell lines with stable overexpression of selected miRNAs for proliferation tests. We found a significant reverse correlation between DNA methylation and expression levels of mir-339-3p, mir-148a-3p, mir-148a-5p and mir-193a-5 demonstrating epigenetic regulation of these miRNAs in cHL cell lines. Moreover, we demonstrated direct interaction between miR-148a-3p and IL15 and HOMER1 transcripts as well as between mir-148a-5p and SUB1 and SERPINH1 transcripts. Furthermore, mir-148a overexpression resulted in reduced cell proliferation in the KM-H2 cell line. In summary, we report that mir-148a is a novel tumor suppressor inactivated in cHL and that epigenetic silencing of miRNAs is a common phenomenon in cHL.
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Cancer-Associated Function of 2-Cys Peroxiredoxin Subtypes as a Survival Gatekeeper. Antioxidants (Basel) 2018; 7:antiox7110161. [PMID: 30423872 PMCID: PMC6262534 DOI: 10.3390/antiox7110161] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 11/02/2018] [Accepted: 11/07/2018] [Indexed: 12/15/2022] Open
Abstract
Cancer cells are abnormal cells that do not comply with tissue homeostasis but undergo uncontrolled proliferation. Such abnormality is driven mostly by somatic mutations on oncogenes and tumor suppressors. Cancerous mutations show intra-tumoral heterogeneity across cancer types and eventually converge into the self-activation of proliferative signaling. While transient production of intracellular reactive oxygen species (ROS) is essential for cell signaling, its persistent production is cytotoxic. Thus, cancer cells require increased levels of intracellular ROS for continuous proliferation, but overexpress cellular peroxidase enzymes, such as 2-Cys peroxiredoxins, to maintain ROS homeostasis. However, suppression of 2-Cys peroxiredoxins has also been reported in some metastatic cancers. Hence, the cancer-associated functions of 2-Cys peroxiredoxins must be illuminated in the cellular context. In this review, we describe the distinctive signaling roles of 2-Cys peroxiredoxins beyond their intrinsic ROS-scavenging role in relation to cancer cell death and survival.
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Chandimali N, Jeong DK, Kwon T. Peroxiredoxin II Regulates Cancer Stem Cells and Stemness-Associated Properties of Cancers. Cancers (Basel) 2018; 10:cancers10090305. [PMID: 30177619 PMCID: PMC6162743 DOI: 10.3390/cancers10090305] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 08/31/2018] [Accepted: 08/31/2018] [Indexed: 01/06/2023] Open
Abstract
Cancer stem cells (CSCs) represent a sub-population of cancer cells with the ability to regulate stemness-associated properties which are specifically responsible for unlimited growth of cancers, generation of diverse cancer cells in differentiated state and resistance to existing chemotherapy and radiotherapy. Even though, current therapies destroy majority of cancer cells, it is believed to leave CSCs without eradicating which may be the conceptualization for chemoresistance and radio-resistance. Reactive oxygen species (ROS) maintain stem cells and regulate the stemness-associated properties of cancers. Beyond the maximum limit, ROS can damage cellular functions of cancers by subjecting them to oxidative stress. Thus, maintenance of ROS level plays an important role in cancers to regulate stemness-associated properties. Peroxiredoxin II (Prx II) is a member of peroxiredoxin antioxidant enzyme family which considers as a regulator of ROS in cellular environments by modulating redox status to maintain CSC phenotype and stemness properties. Prx II has cell type-dependent expression in various types of cancer cells and overexpression or silenced expression of Prx II in cancers is associated with stem cell phenotype and stemness-associated properties via activation or deactivation of various signaling pathways. In this review, we summarized available studies on Prx II expression in cancers and the mechanisms by which Prx II takes parts to regulate CSCs and stemness-associated properties. We further discussed the potential therapeutic effects of altering Prx II expression in cancers for better anticancer strategies by sensitizing cancer cells and stem cells to oxidative stress and inhibiting stemness-associated properties.
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Affiliation(s)
- Nisansala Chandimali
- Laboratory of Animal Genetic Engineering and Stem Cell Biology, Advanced Convergence Technology and Science, Jeju National University, Jeju 63243, Korea.
| | - Dong Kee Jeong
- Laboratory of Animal Genetic Engineering and Stem Cell Biology, Advanced Convergence Technology and Science, Jeju National University, Jeju 63243, Korea.
- Laboratory of Animal Genetic Engineering and Stem Cell Biology, Subtropical/Tropical Organism Gene Bank, Jeju National University, Jeju 63243, Korea.
| | - Taeho Kwon
- Laboratory of Animal Genetic Engineering and Stem Cell Biology, Advanced Convergence Technology and Science, Jeju National University, Jeju 63243, Korea.
- Laboratory of Animal Genetic Engineering and Stem Cell Biology, Subtropical/Tropical Organism Gene Bank, Jeju National University, Jeju 63243, Korea.
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Preconditioning by Hydrogen Peroxide Enhances Multiple Properties of Human Decidua Basalis Mesenchymal Stem/Multipotent Stromal Cells. Stem Cells Int 2018; 2018:6480793. [PMID: 29795719 PMCID: PMC5949187 DOI: 10.1155/2018/6480793] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Accepted: 03/26/2018] [Indexed: 02/06/2023] Open
Abstract
Stem cell-based therapies rely on stem cell ability to repair in an oxidative stress environment. Preconditioning of mesenchymal stem cells (MSCs) to a stress environment has beneficial effects on their ability to repair injured tissues. We previously reported that MSCs from the decidua basalis (DBMSCs) of human placenta have many important cellular functions that make them potentially useful for cell-based therapies. Here, we studied the effect of DBMSC preconditioning to a stress environment. DBMSCs were exposed to various concentrations of hydrogen peroxide (H2O2), and their functions were then assessed. DBMSC expression of immune molecules after preconditioning was also determined. DBMSC preconditioning with H2O2 enhanced their proliferation, colonogenicity, adhesion, and migration. In addition, DBMSCs regardless of H2O2 treatment displayed antiangiogenic activity. H2O2 preconditioning also increased DBMSC expression of genes that promote cellular functions and decreased the expression of genes, which have opposite effect on their functions. Preconditioning also reduced DBMSC expression of IL-1β, but had no effects on the expression of other immune molecules that promote proliferation, adhesion, and migration. These data show that DBMSCs resist a toxic environment, which adds to their potential as a candidate stem cell type for treating various diseases in hostile environments.
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Özdemir İ, Pınarlı FG, Pınarlı FA, Aksakal FNB, Okur A, Uyar Göçün P, Karadeniz C. Epigenetic silencing of the tumor suppressor genes SPI1, PRDX2, KLF4, DLEC1, and DAPK1 in childhood and adolescent lymphomas. Pediatr Hematol Oncol 2018; 35:131-144. [PMID: 30020823 DOI: 10.1080/08880018.2018.1467986] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The aim of the study was to investigate the expression and methylation status of seven distinctive genes with tumor suppressing properties in childhood and adolescent lymphomas. A total of 96 patients with Hodgkin Lymphoma (HL, n = 41), Non-Hodgkin Lymphoma (NHL, n = 15), and reactive lymphoid hyperplasia (RLH, n = 40, as controls) are included in the research. The expression status of CDKN2A, SPI1, PRDX2, DLEC1, FOXO1, KLF4 and DAPK1 genes were measured with QPCR method after the RNA isolation from paraffin blocks of tumor tissue and cDNA conversion. DNA isolation was performed from samples with low gene expression followed by methylation PCR study specific to promoter regions of these genes. We found that SPI1, PRDX2, DLEC1, KLF4, and DAPK1 genes are significantly less expressed in patient than the control group (p = 0.0001). However, expression of CDKNA2 and FOXO1 genes in the patient and control groups were not statistically different. The methylation ratios of all genes excluding the CDKN2A and FOXO1 were significantly higher in the HL and NHL groups than the controls (p = 0.0001). We showed that SPI1, PRDX2, DLEC1, KLF4 and DAPK1 genes are epigenetically silenced via hypermethylation in the tumor tissues of children with HL and NHL. As CDKN2A gene was not expressed in both patient and control groups, we conclude that it is not specific to malignancy. As FOXO1 gene was similarly expressed in both groups, its relationship with malignancy could not be established. The epigenetically silenced genes may be candidates for biomarkers or therapeutic targets in childhood and adolescent lymphomas.
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Affiliation(s)
- İhsan Özdemir
- a Department of Pediatrics , Gazi University Medical Faculty , Ankara , Turkey
| | - Faruk Güçlü Pınarlı
- b Department of Pediatric Oncology , Gazi University Medical Faculty , Ankara , Turkey
| | - Ferda Alpaslan Pınarlı
- c Center of Cell Research and Genetic Diagnosis, Dışkapı Yıldırım Beyazıt Research Hospital , Health Sciences University , Ankara , Turkey
| | - F Nur Baran Aksakal
- d Department of Public Health , Gazi University Medical Faculty , Ankara , Turkey
| | - Arzu Okur
- b Department of Pediatric Oncology , Gazi University Medical Faculty , Ankara , Turkey
| | - Pınar Uyar Göçün
- e Department of Pathology , Gazi University Medical Faculty , Ankara , Turkey
| | - Ceyda Karadeniz
- b Department of Pediatric Oncology , Gazi University Medical Faculty , Ankara , Turkey
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6
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Silencing of peroxiredoxin II by promoter methylation is necessary for the survival and migration of gastric cancer cells. Exp Mol Med 2018; 50:e443. [PMID: 29422545 PMCID: PMC5903821 DOI: 10.1038/emm.2017.267] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Revised: 09/04/2017] [Accepted: 09/13/2017] [Indexed: 12/16/2022] Open
Abstract
Peroxiredoxin (Prx), a family of ubiquitous thiol peroxidases, functions as a redox signaling regulator that controls cellular H2O2 in mammalian cells and has recently received attention for being overexpressed in various cancer types. In this study, we show that Prx type II (PrxII) is rather silenced in gastric cancer cells. PrxII expression is severely downregulated in 9 out of the 28 gastric cancer cell lines. Strikingly, PrxII expression is completely lost in three cell lines, MKN28, MKN74 and SNU484. Loss of PrxII expression is due to DNA methyltransferase 1-dependent methylation at the promoter region of the PrxII gene. Restoration of PrxII expression using a retroviral system markedly reduces the colony-forming ability and migratory activity of both MKN28 and SNU484 cells by inhibiting Src kinase. Mechanistically, PrxII peroxidase activity is essential for regulating gastric cancer cell migration. Bioinformatics analysis from The Cancer Genome Atlas stomach cancer data (STAD) revealed significantly low PrxII expression in gastric cancer patients and a negative correlation between PrxII expression and methylation levels. More importantly, low PrxII expression also strongly correlates with poor survival in cancer patients. Thus our study suggests that PrxII may be the first thiol peroxidase that simultaneously regulates both survival and metastasis in gastric cancer cells with high clinical relevance.
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Interaction of tankyrase and peroxiredoxin II is indispensable for the survival of colorectal cancer cells. Nat Commun 2017; 8:40. [PMID: 28659575 PMCID: PMC5489516 DOI: 10.1038/s41467-017-00054-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 05/02/2017] [Indexed: 12/16/2022] Open
Abstract
Mammalian 2-Cys peroxiredoxin (Prx) enzymes are overexpressed in most cancer tissues, but their specific signaling role in cancer progression is poorly understood. Here we demonstrate that Prx type II (PrxII) plays a tumor-promoting role in colorectal cancer by interacting with a poly(ADP-ribose) polymerase (PARP) tankyrase. PrxII deletion in mice with inactivating mutation of adenomatous polyposis coli (APC) gene reduces intestinal adenomatous polyposis via Axin/β-catenin axis and thereby promotes survival. In human colorectal cancer cells with APC mutations, PrxII depletion consistently reduces the β-catenin levels and the expression of β-catenin target genes. Essentially, PrxII depletion hampers the PARP-dependent Axin1 degradation through tankyrase inactivation. Direct binding of PrxII to tankyrase ARC4/5 domains seems to be crucial for protecting tankyrase from oxidative inactivation. Furthermore, a chemical compound targeting PrxII inhibits the expansion of APC-mutant colorectal cancer cells in vitro and in vivo tumor xenografts. Collectively, this study reveals a redox mechanism for regulating tankyrase activity and implicates PrxII as a targetable antioxidant enzyme in APC-mutation-positive colorectal cancer. 2-Cys peroxiredoxin (Prx) enzymes are highly expressed in most cancers but how they promote cancer progression is unclear. Here the authors show that in colorectal cancers with APC mutation, PrxII binds to tankyrase and prevents its oxidative inactivation, thereby preventing Axin1-dependent degradation of ²b-catenin.
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Ow SH, Chua PJ, Bay BH. Epigenetic regulation of peroxiredoxins: Implications in the pathogenesis of cancer. Exp Biol Med (Maywood) 2016; 242:140-147. [PMID: 27633575 DOI: 10.1177/1535370216669834] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Peroxiredoxin I to VI (PRX I-VI), a family of highly conserved antioxidants, has been implicated in numerous diseases. There have been reports that PRXs are expressed aberrantly in a variety of tumors, implying that they could play an important role in carcinogenesis. Epigenetic mechanisms such as DNA methylation, histone modifications, and microRNAs have been reported to modulate expression of PRXs. In addition, the use of epigenetic regulators, such as histone deacetylases, has been demonstrated to restore PRX to normal levels, indicating that the reversible nature of epigenetics can be exploited for future treatments.
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Affiliation(s)
- Suet-Hui Ow
- Department of Anatomy, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117594, Singapore
| | - Pei-Jou Chua
- Department of Anatomy, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117594, Singapore
| | - Boon-Huat Bay
- Department of Anatomy, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117594, Singapore
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Vergara D, Simeone P, De Matteis S, Carloni S, Lanuti P, Marchisio M, Miscia S, Rizzello A, Napolitano R, Agostinelli C, Maffia M. Comparative proteomic profiling of Hodgkin lymphoma cell lines. MOLECULAR BIOSYSTEMS 2016; 12:219-32. [PMID: 26588820 DOI: 10.1039/c5mb00654f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Classical Hodgkin lymphoma (cHL) is a malignancy with complex pathogenesis. The hallmark of the disease is the presence of large mononucleated Hodgkin and bi- or multinucleated Reed/Sternberg (H/RS) cells. The origin of HRS cells in cHL is controversial as these cells show the coexpression of markers of several lineages. Using a proteomic approach, we compared the protein expression profile of cHL models of T- and B-cell derivation to find proteins differentially expressed in these cell lines. A total of 67 proteins were found differentially expressed between the two cell lines including metabolic proteins and proteins involved in the regulation of the cytoskeleton and/or cell migration, which were further validated by western blotting. Additionally, the expression of selected B- and T-cell antigens was also assessed by flow cytometry to reveal significant differences in the expression of different surface markers. Bioinformatics analysis was then applied to our dataset to find enriched pathways and networks, and to identify possible key regulators. In the present study, a proteomic approach was used to compare the protein expression profiles of two cHL cell lines. The identified proteins and/or networks, many of which not previously related to cHL, may be important to better define the pathogenesis of the disease, to identify novel diagnostic markers, and to design new therapeutic strategies.
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Affiliation(s)
- D Vergara
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Monteroni, 73100 Lecce, Italy. and Laboratory of Clinical Proteomic, "Giovanni Paolo II" Hospital, ASL-Lecce, Italy.
| | - P Simeone
- Department of Medicine and Aging Science, School of Medicine and Health Science and Unit of Cytomorphology, Research Centre on Aging (Ce.S.I), University "G. d'Annunzio" of Chieti-Pescara, 66100 Chieti, Italy
| | - S De Matteis
- Biosciences Laboratory, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) IRCCS, 47014 Meldola, Italy
| | - S Carloni
- Biosciences Laboratory, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) IRCCS, 47014 Meldola, Italy
| | - P Lanuti
- Department of Medicine and Aging Science, School of Medicine and Health Science and Unit of Cytomorphology, Research Centre on Aging (Ce.S.I), University "G. d'Annunzio" of Chieti-Pescara, 66100 Chieti, Italy
| | - M Marchisio
- Department of Medicine and Aging Science, School of Medicine and Health Science and Unit of Cytomorphology, Research Centre on Aging (Ce.S.I), University "G. d'Annunzio" of Chieti-Pescara, 66100 Chieti, Italy
| | - S Miscia
- Department of Medicine and Aging Science, School of Medicine and Health Science and Unit of Cytomorphology, Research Centre on Aging (Ce.S.I), University "G. d'Annunzio" of Chieti-Pescara, 66100 Chieti, Italy
| | - A Rizzello
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Monteroni, 73100 Lecce, Italy. and Laboratory of Clinical Proteomic, "Giovanni Paolo II" Hospital, ASL-Lecce, Italy.
| | - R Napolitano
- Biosciences Laboratory, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) IRCCS, 47014 Meldola, Italy
| | - C Agostinelli
- Department of Experimental, Hematopathology and Hematology Sections, Diagnostic and Specialty Medicine, S. Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy
| | - M Maffia
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Monteroni, 73100 Lecce, Italy. and Laboratory of Clinical Proteomic, "Giovanni Paolo II" Hospital, ASL-Lecce, Italy.
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Jian W, Zhong L, Wen J, Tang Y, Qiu B, Wu Z, Yan J, Zhou X, Zhao T. SEPTIN2 and STATHMIN Regulate CD99-Mediated Cellular Differentiation in Hodgkin's Lymphoma. PLoS One 2015; 10:e0127568. [PMID: 26000982 PMCID: PMC4441373 DOI: 10.1371/journal.pone.0127568] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 04/16/2015] [Indexed: 11/30/2022] Open
Abstract
Hodgkin’s lymphoma (HL) is a lymphoid neoplasm characterized by Hodgkin’s and Reed-Sternberg (H/RS) cells, which is regulated by CD99. We previously reported that CD99 downregulation led to the transformation of murine B lymphoma cells (A20) into cells with an H/RS phenotype, while CD99 upregulation induced differentiation of classical Hodgkin’s lymphoma (cHL) cells (L428) into terminal B-cells. However, the molecular mechanism remains unclear. In this study, using fluorescence two-dimensional differential in-gel electrophoresis and matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS), we have analyzed the alteration of protein expression following CD99 upregulation in L428 cells as well as downregulation of mouse CD99 antigen-like 2 (mCD99L2) in A20 cells. Bioinformatics analysis showed that SEPTIN2 and STATHMIN, which are cytoskeleton proteins, were significantly differentially expressed, and chosen for further validation and functional analysis. Differential expression of SEPTIN2 was found in both models and was inversely correlated with CD99 expression. STATHMIN was identified in the A20 cell line model and its expression was positively correlated with that of CD99. Importantly, silencing of SEPTIN2 with siRNA substantially altered the cellular cytoskeleton in L428 cells. The downregulation of STATHMIN by siRNA promoted the differentiation of H/RS cells toward terminal B-cells. These results suggest that SEPTIN2-mediated cytoskeletal rearrangement and STATHMIN-mediated differentiation may contribute to changes in cell morphology and differentiation of H/RS cells with CD99 upregulation in HL.
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Affiliation(s)
- Wenjing Jian
- Department of Molecular and Tumor Pathology Laboratory of Guangdong Province, School of Basic Medical Science, Southern Medical University, Guangzhou, China
| | - Lin Zhong
- Department of Pathology, the Third Affiliated Hospital, Southern Medical University, Guangzhou, China
| | - Jing Wen
- Department of Molecular and Tumor Pathology Laboratory of Guangdong Province, School of Basic Medical Science, Southern Medical University, Guangzhou, China
| | - Yao Tang
- Department of Molecular and Tumor Pathology Laboratory of Guangdong Province, School of Basic Medical Science, Southern Medical University, Guangzhou, China
| | - Bo Qiu
- Department of Molecular and Tumor Pathology Laboratory of Guangdong Province, School of Basic Medical Science, Southern Medical University, Guangzhou, China
| | - Ziqing Wu
- Department of Molecular and Tumor Pathology Laboratory of Guangdong Province, School of Basic Medical Science, Southern Medical University, Guangzhou, China
| | - Jinhai Yan
- Department of Molecular and Tumor Pathology Laboratory of Guangdong Province, School of Basic Medical Science, Southern Medical University, Guangzhou, China
| | - Xinhua Zhou
- Department of Molecular and Tumor Pathology Laboratory of Guangdong Province, School of Basic Medical Science, Southern Medical University, Guangzhou, China
- * E-mail: (TZ); (XHZ)
| | - Tong Zhao
- Department of Pathology, the Third Affiliated Hospital, Southern Medical University, Guangzhou, China
- * E-mail: (TZ); (XHZ)
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CBFB-MYH11 hypomethylation signature and PBX3 differential methylation revealed by targeted bisulfite sequencing in patients with acute myeloid leukemia. J Hematol Oncol 2014; 7:66. [PMID: 25266220 PMCID: PMC4197269 DOI: 10.1186/s13045-014-0066-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Accepted: 09/06/2014] [Indexed: 12/18/2022] Open
Abstract
Background Studying DNA methylation changes in the context of structural rearrangements and point mutations as well as gene expression changes enables the identification of genes that are important for disease onset and progression in different subtypes of acute myeloid leukemia (AML) patients. The aim of this study was to identify differentially methylated genes with potential impact on AML pathogenesis based on the correlation of methylation and expression data. Methods The primary method of studying DNA methylation changes was targeted bisulfite sequencing capturing approximately 84 megabases (Mb) of the genome in 14 diagnostic AML patients and a healthy donors’ CD34+ pool. Subsequently, selected DNA methylation changes were confirmed by 454 bisulfite pyrosequencing in a larger cohort of samples. Furthermore, we addressed gene expression by microarray profiling and correlated methylation of regions adjacent to transcription start sites with expression of corresponding genes. Results Here, we report a novel hypomethylation pattern, specific to CBFB-MYH11 fusion resulting from inv(16) rearrangement that is associated with genes previously described as upregulated in inv(16) AML. We assume that this hypomethylation and corresponding overexpresion occurs in the genes whose function is important in inv(16) leukemogenesis. Further, by comparing all targeted methylation and microarray expression data, PBX3 differential methylation was found to correlate with its gene expression. PBX3 has been recently shown to be a key interaction partner of HOX genes during leukemogenesis and we revealed higher incidence of relapses in PBX3-overexpressing patients. Conclusions We discovered new genomic regions with aberrant DNA methylation that are associated with expression of genes involved in leukemogenesis. Our results demonstrate the potential of the targeted approach for DNA methylation studies to reveal new regulatory regions. Electronic supplementary material The online version of this article (doi:10.1186/s13045-014-0066-4) contains supplementary material, which is available to authorized users.
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