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Allen B, Savoy L, Ryabinin P, Bottomly D, Chen R, Goff B, Wang A, McWeeney SK, Zhang H. Upregulation of HOXA3 by isoform-specific Wilms tumour 1 drives chemotherapy resistance in acute myeloid leukaemia. Br J Haematol 2024; 205:207-219. [PMID: 38867543 DOI: 10.1111/bjh.19563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Accepted: 05/14/2024] [Indexed: 06/14/2024]
Abstract
Upregulation of the Wilms' tumour 1 (WT1) gene is common in acute myeloid leukaemia (AML) and is associated with poor prognosis. WT1 generates 12 primary transcripts through different translation initiation sites and alternative splicing. The short WT1 transcripts express abundantly in primary leukaemia samples. We observed that overexpression of short WT1 transcripts lacking exon 5 with and without the KTS motif (sWT1+/- and sWT1-/-) led to reduced cell growth. However, only sWT1+/- overexpression resulted in decreased CD71 expression, G1 arrest, and cytarabine resistance. Primary AML patient cells with low CD71 expression exhibit resistance to cytarabine, suggesting that CD71 may serve as a potential biomarker for chemotherapy. RNAseq differential expressed gene analysis identified two transcription factors, HOXA3 and GATA2, that are specifically upregulated in sWT1+/- cells, whereas CDKN1A is upregulated in sWT1-/- cells. Overexpression of either HOXA3 or GATA2 reproduced the effects of sWT1+/-, including decreased cell growth, G1 arrest, reduced CD71 expression and cytarabine resistance. HOXA3 expression correlates with chemotherapy response and overall survival in NPM1 mutation-negative leukaemia specimens. Overexpression of HOXA3 leads to drug resistance against a broad spectrum of chemotherapeutic agents. Our results suggest that WT1 regulates cell proliferation and drug sensitivity in an isoform-specific manner.
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MESH Headings
- Humans
- Antigens, CD/genetics
- Antigens, CD/metabolism
- Antigens, CD/biosynthesis
- Cell Line, Tumor
- Cytarabine/pharmacology
- Cytarabine/therapeutic use
- Drug Resistance, Neoplasm/genetics
- Gene Expression Regulation, Leukemic/drug effects
- Homeodomain Proteins/genetics
- Homeodomain Proteins/metabolism
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/drug therapy
- Leukemia, Myeloid, Acute/metabolism
- Leukemia, Myeloid, Acute/pathology
- Nucleophosmin
- Protein Isoforms
- Receptors, Transferrin
- Up-Regulation
- WT1 Proteins/genetics
- WT1 Proteins/metabolism
- WT1 Proteins/biosynthesis
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Affiliation(s)
- Basil Allen
- Division of Oncological Sciences, Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Lindsey Savoy
- Division of Oncological Sciences, Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Peter Ryabinin
- Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Daniel Bottomly
- Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Reid Chen
- Division of Oncological Sciences, Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Bonnie Goff
- Division of Oncological Sciences, Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Anthony Wang
- Division of Oncological Sciences, Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Shannon K McWeeney
- Division of Bioinformatics and Computational Biology, Department of Medical Informatics and Clinical Epidemiology, Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Haijiao Zhang
- Division of Oncological Sciences, Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
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Gao J, Wu Y, Yu J, Qiu Y, Yi T, Luo C, Zhang J, Lu G, Li X, Xiong F, Wu X, Pan X. Impact of genomic and epigenomic alterations of multigene on a multicancer pedigree. Cancer Med 2024; 13:e7394. [PMID: 38970307 PMCID: PMC11226725 DOI: 10.1002/cam4.7394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 05/14/2024] [Accepted: 06/05/2024] [Indexed: 07/08/2024] Open
Abstract
BACKGROUND Germline mutations have been identified in a small number of hereditary cancers, but the genetic predisposition for many familial cancers remains to be elucidated. METHODS This study identified a Chinese pedigree that presented different cancers (breast cancer, BRCA; adenocarcinoma of the esophagogastric junction, AEG; and B-cell acute lymphoblastic leukemia, B-ALL) in each of the three generations. Whole-genome sequencing and whole-exome sequencing were performed on peripheral blood or bone marrow and cancer biopsy samples. Whole-genome bisulfite sequencing was conducted on the monozygotic twin brothers, one of whom developed B-ALL. RESULTS According to the ACMG guidelines, bioinformatic analysis of the genome sequencing revealed 20 germline mutations, particularly mutations in the DNAH11 (c.9463G > A) and CFH (c.2314G > A) genes that were documented in the COSMIC database and validated by Sanger sequencing. Forty-one common somatic mutated genes were identified in the cancer samples, displaying the same type of single nucleotide substitution Signature 5. Meanwhile, hypomethylation of PLEK2, MRAS, and RXRA as well as hypermethylation of CpG island associated with WT1 was shown in the twin with B-ALL. CONCLUSIONS These findings reveal genomic alterations in a pedigree with multiple cancers. Mutations found in the DNAH11, CFH genes, and other genes predispose to malignancies in this family. Dysregulated methylation of WT1, PLEK2, MRAS, and RXRA in the twin with B-ALL increases cancer susceptibility. The similarity of the somatic genetic changes among the three cancers indicates a hereditary impact on the pedigree. These familial cancers with germline and somatic mutations, as well as epigenomic alterations, represent a common molecular basis for many multiple cancer pedigrees.
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Affiliation(s)
- Jinyu Gao
- Department of PediatricsNanfang Hospital, Southern Medical UniversityGuangzhouChina
- Guangdong Provincial Key Laboratory of Single Cell Technology and ApplicationSouthern Medical UniversityGuangzhouChina
| | - Yongzhang Wu
- Guangdong Provincial Key Laboratory of Single Cell Technology and ApplicationSouthern Medical UniversityGuangzhouChina
- Department of Biochemistry and Molecular BiologySchool of Basic Medical Sciences, Southern Medical UniversityGuangzhouChina
| | - Jieming Yu
- Guangdong Provincial Key Laboratory of Single Cell Technology and ApplicationSouthern Medical UniversityGuangzhouChina
- Affiliated Shenzhen Maternity and Child Healthcare Hospital, Southern Medical UniversityShenzhenChina
| | - Yinbin Qiu
- Guangdong Provincial Key Laboratory of Single Cell Technology and ApplicationSouthern Medical UniversityGuangzhouChina
| | - Tiantian Yi
- Department of PediatricsNanfang Hospital, Southern Medical UniversityGuangzhouChina
- Guangdong Provincial Key Laboratory of Single Cell Technology and ApplicationSouthern Medical UniversityGuangzhouChina
| | - Chaochao Luo
- Guangdong Provincial Key Laboratory of Single Cell Technology and ApplicationSouthern Medical UniversityGuangzhouChina
| | - Junxiao Zhang
- SequMed Institute of Biomedical SciencesGuangzhouChina
| | - Gary Lu
- Department of Fetal Medicine and Prenatal DiagnosisZhujiang Hospital, Southern Medical UniversityGuangzhouChina
| | - Xu Li
- Kaiser Permanente Regional Genetics Laboratory, San Jose Medical CenterSan JoseCaliforniaUSA
| | - Fu Xiong
- Department of Medical GeneticsSchool of Basic Medical Sciences, Southern Medical UniversityGuangzhouChina
| | - Xuedong Wu
- Department of PediatricsNanfang Hospital, Southern Medical UniversityGuangzhouChina
- Guangdong Provincial Key Laboratory of Single Cell Technology and ApplicationSouthern Medical UniversityGuangzhouChina
| | - Xinghua Pan
- Department of PediatricsNanfang Hospital, Southern Medical UniversityGuangzhouChina
- Guangdong Provincial Key Laboratory of Single Cell Technology and ApplicationSouthern Medical UniversityGuangzhouChina
- Department of Biochemistry and Molecular BiologySchool of Basic Medical Sciences, Southern Medical UniversityGuangzhouChina
- Precision Regenerative Medicine Research Centre, Division of Medical SciencesMacau University of Science and TechnologyMacaoChina
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3
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Chen M, Fang X, Du R, Meng J, Liu J, Liu M, Yang Y, Wang C. A Nucleus-Targeting WT1 Antagonistic Peptide Encapsulated in Polymeric Nanomicelles Combats Refractory Chronic Myeloid Leukemia. Pharmaceutics 2023; 15:2305. [PMID: 37765274 PMCID: PMC10534672 DOI: 10.3390/pharmaceutics15092305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 08/30/2023] [Accepted: 09/01/2023] [Indexed: 09/29/2023] Open
Abstract
Chronic myeloid leukemia (CML) is recognized as a classic clonal myeloproliferative disorder. Given the limited treatment options for CML patients in the accelerated phase (AP) and blast phase (BP), there is an evident need to develop new therapeutic strategies. This has the potential to improve outcomes for individuals in the advanced stages of CML. A promising therapeutic target is Wilms' tumor 1 (WT1), which is highly expressed in BP-CML cells and plays a crucial role in CML progression. In this study, a chemically synthesized nucleus-targeting WT1 antagonistic peptide termed WIP2W was identified. The therapeutic implications of both the peptide and its micellar formulation, M-WIP2W, were evaluated in WT1+ BP-CML cell lines and in mice. The findings indicate that WIP2W can bind specifically to the WT1 protein, inducing cell cycle arrest and notable cytotoxicity in WT1+ BP-CML cells. Moreover, subcutaneous injections of M-WIP2W were observed to significantly enhance intra-tumoral accumulation and to effectively inhibit tumor growth. Thus, WIP2W stands out as a potent and selective WT1 inhibitor, and the M-WIP2W nanoformulation appears promising for the therapeutic treatment of refractory CML as well as other WT1-overexpressing malignant cancers.
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Affiliation(s)
- Mengting Chen
- CAS Key Laboratory of Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China; (M.C.); (X.F.); (R.D.); (J.M.); (J.L.); (M.L.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaocui Fang
- CAS Key Laboratory of Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China; (M.C.); (X.F.); (R.D.); (J.M.); (J.L.); (M.L.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Rong Du
- CAS Key Laboratory of Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China; (M.C.); (X.F.); (R.D.); (J.M.); (J.L.); (M.L.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jie Meng
- CAS Key Laboratory of Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China; (M.C.); (X.F.); (R.D.); (J.M.); (J.L.); (M.L.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jingyi Liu
- CAS Key Laboratory of Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China; (M.C.); (X.F.); (R.D.); (J.M.); (J.L.); (M.L.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Mingpeng Liu
- CAS Key Laboratory of Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China; (M.C.); (X.F.); (R.D.); (J.M.); (J.L.); (M.L.)
- University of Chinese Academy of Sciences, Beijing 100049, China
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yanlian Yang
- CAS Key Laboratory of Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China; (M.C.); (X.F.); (R.D.); (J.M.); (J.L.); (M.L.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chen Wang
- CAS Key Laboratory of Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China; (M.C.); (X.F.); (R.D.); (J.M.); (J.L.); (M.L.)
- University of Chinese Academy of Sciences, Beijing 100049, China
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Novel WT1 Target Genes: IL-2, IL-2RB, and IL-2RG Discovered during WT1 Silencing Using Lentiviral-Based RNAi in Myeloid Leukemia Cells. BIOMED RESEARCH INTERNATIONAL 2020; 2020:7851414. [PMID: 33110919 PMCID: PMC7582064 DOI: 10.1155/2020/7851414] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 09/18/2020] [Accepted: 09/28/2020] [Indexed: 12/19/2022]
Abstract
Wilms' tumor 1 (WT1) is a transcription factor which plays a major role in cell proliferation, differentiation, survival, and apoptosis. WT1 was first identified as a tumor suppressor gene in Wilms' tumor. However, overexpression of WT1 has been detected in several types of malignancy including some types of leukemia. To investigate the molecular mechanism underlying WT1-mediated leukemogenesis, lentiviral-based siRNA was employed as a tool to suppress WT1 expression in the myeloid leukemia cell line, K562. Successfully, both WT1 RNA and protein levels were downregulated in the leukemia cells. The silencing of WT1 resulted in significant growth inhibition in WT1-siRNA-treated cells for 40 ± 7.0%, 44 ± 9.5%, and 88 ± 9.1% at 48, 72, and 96 hours posttransduction as compared with the control cells, respectively. By using apoptosis detection assays (caspase-3/7 activity and Annexin V-FITC/PI assays), WT1 silencing induced a higher degree of early and late apoptosis in siRNA-treated K562 as compared with the control cells. Interestingly, the expression of survival signaling genes, IL-2, IL-2RB, and IL-2RG, was also suppressed after WT1-siRNA treatment. In addition, the WT1 silencing also inhibited the S phase of the cell cycle and induced cell death. Our results indicated that WT1 silencing by siRNA can suppress cellular proliferation, induce apoptosis, and reduce S phase fraction of K562 cells. Moreover, transcriptional modulation of IL-2, IL-2RB, and IL2-2RG expression by WT1 was likely involved in this phenotypic change. Overall, this study confirmed the oncogenic role of WT1 in myeloid leukemia and discovered the new target genes of WT1 which are likely involved in WT1-mediated leukemogenesis.
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5
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Wilms tumor gene single nucleotide polymorphism rs16754 predicts a favorable outcome in children with acute lymphoblastic leukemia. J Cancer Res Clin Oncol 2015. [DOI: 10.1007/s00432-015-2018-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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6
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Hicks C, Miele L, Koganti T, Young-Gaylor L, Rogers D, Vijayakumar V, Megason G. Analysis of Patterns of Gene Expression Variation within and between Ethnic Populations in Pediatric B-ALL. Cancer Inform 2013; 12:155-73. [PMID: 24023509 PMCID: PMC3762614 DOI: 10.4137/cin.s11831] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
B-Precursor acute lymphoblastic leukemia (B-ALL) is the most common childhood cancer. Although 80% of B-ALL patients are able to be cured, significant challenges persist. Significant disparities in clinical outcomes and mortality rates exist between racial/ethnic populations. The objective of this study was to determine whether gene expression levels significantly differ between ethnic populations. We compared gene expression levels between four ethnic populations (Whites, Blacks, Hispanics, and Asians) in the United States. Additionally, we performed network and pathway analysis to identify gene networks and pathways. Gene expression data involved 198 samples distributed as follows: 126 Whites, 51 Hispanics, 13 Blacks, and 8 Asians. We identified 300 highly significantly (P < 0.001) differentially expressed genes between the four ethnic populations. Among the identified genes included the genes PHF6, BRD3, CRLF2, and RNF135 which have been implicated in pediatric B-ALL. We identified key pathways implicated in B-ALL including the PDGF, PI3/AKT, ERBB2-ERBB3, and IL-15 signaling pathways.
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Affiliation(s)
- Chindo Hicks
- Department of Medicine, University of Mississippi Medical Center, Jackson, MS. ; Cancer Institute, University of Mississippi Medical Center, Jackson, MS. ; Chindren's Cancer Center University of Mississippi Medical Center, Jackson, MS
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7
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Bourkoula K, Englert C, Giaisi M, Köhler R, Krammer PH, Li-Weber M. The Wilms' tumor suppressor WT1 enhances CD95L expression and promotes activation-induced cell death in leukemic T cells. Int J Cancer 2013; 134:291-300. [DOI: 10.1002/ijc.28379] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2013] [Revised: 06/25/2013] [Accepted: 06/27/2013] [Indexed: 12/12/2022]
Affiliation(s)
- Konstantina Bourkoula
- Tumor Immunology Program (D030); German Cancer Research Center (DKFZ); Heidelberg Germany
| | - Christoph Englert
- Leibniz Institute for Age Research-Fritz Lipmann Institute e.V. (FLI); Jena Germany
| | - Marco Giaisi
- Tumor Immunology Program (D030); German Cancer Research Center (DKFZ); Heidelberg Germany
| | - Rebecca Köhler
- Tumor Immunology Program (D030); German Cancer Research Center (DKFZ); Heidelberg Germany
| | - Peter H. Krammer
- Tumor Immunology Program (D030); German Cancer Research Center (DKFZ); Heidelberg Germany
| | - Min Li-Weber
- Tumor Immunology Program (D030); German Cancer Research Center (DKFZ); Heidelberg Germany
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8
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Passmore MR, Nataatmadja M, Fraser JF. Assessment of control tissue for gene and protein expression studies: a comparison of three alternative lung sources. ScientificWorldJournal 2012; 2012:523840. [PMID: 22593690 PMCID: PMC3346271 DOI: 10.1100/2012/523840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Accepted: 11/24/2011] [Indexed: 11/23/2022] Open
Abstract
The use of an appropriate control group in human research is essential in investigating the level of a pathological disorder. This study aimed to compare three alternative sources of control lung tissue and to determine their suitability for gene and protein expression studies. Gene and protein expression levels of the vascular endothelial growth factor (VEGF) and gelatinase families and their receptors were measured using real-time reverse transcription polymerase chain reaction (RT-PCR) and immunohistochemistry. The gene expression levels of VEGFA, placental growth factor (PGF), and their receptors, fms-related tyrosine kinase 1 (FLT1), and kinase insert domain receptor (KDR) as well as matrix metalloproteinase-2 (MMP-2) and the inhibitors, tissue inhibitor of matrix metalloproteinase-1 (TIMP-1) and TIMP-2 were significantly higher in lung cancer resections. The gene expression level of MMP-9 was significantly lower in the corresponding samples. Altered protein expression was also detected, depending on the area assessed. The results of this study show that none of the three control groups studied are completely suitable for gene and protein studies associated with the VEGF and gelatinase families, highlighting the need for researchers to be selective in which controls they opt for.
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Affiliation(s)
- Margaret R Passmore
- Critical Care Research Group, University of Queensland, Prince Charles Hospital, Brisbane, Australia.
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9
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Zhang L, Greiner J. Leukemia-associated antigens are immunogenic and have prognostic value in acute myeloid leukemia. Immunotherapy 2012; 3:697-9. [PMID: 21668302 DOI: 10.2217/imt.11.50] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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10
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Ichinohasama R, Oji Y, Yokoyama H, Takeuchi K, Fujiwara T, Ishizawa K, Taniguchi O, Tsuboi A, Oka Y, Sugiyama H. Sensitive immunohistochemical detection of WT1 protein in tumors with anti-WT1 antibody against WT1 235 peptide. Cancer Sci 2010; 101:1089-92. [PMID: 20180815 PMCID: PMC11159499 DOI: 10.1111/j.1349-7006.2010.01522.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
The Wilms' tumor 1 (WT1) gene is overexpressed in leukemia and various types of solid tumor, such as lung and colorectal cancer, and plays an oncogenic role in their tumorigenesis. Recent studies have demonstrated the potential of WT1-targeting cancer immunotherapy in clinical settings. As expression of WT1 protein in tumor cells is a prerequisite for WT1-targeting immunotherapy, immunohistochemical methods to detect WT1 protein with high sensitivity and specificity are required. In the present study, we developed a rabbit polyclonal antibody (WT1-R) against the 9-mer WT1 235 peptide, which is used for vaccination. The specificity of WT1-R was confirmed by immunoprecipitation, western blotting analysis, and competitive enzyme-linked immunosorbent assay. Immunocytochemistry showed the same reactivity against five cell lines (K562, Daudi, HT-180, SW480, and PC-14), whereas levels of WT1 mRNA expression determined by real-time qPCR (RT-PCR) analysis were not equivalent. Next, we examined the reactivity of WT1-R in tissue samples compared with a previously developed anti-WT1 antibody, 6F-H2. WT1-R showed greater sensitivity for detecting WT1 protein expression in samples from four different breast cancer patients than 6F-H2 antibody. The discrepancy in WT1 expression between these methods suggested that immunohistochemical detection of WT1 peptide may be advantageous for predicting the efficacy of WT1 vaccine compared to RT-PCR, and the highly sensitive WT1 antibody, WT1-R, may be useful to detect WT1 protein in tumors.
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Affiliation(s)
- Ryo Ichinohasama
- Division of Hematopathology, Tohoku University Graduate School of Medicine, Sendai, Japan.
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Rushing EJ, Sandberg GD, Horkayne-Szakaly I. High-grade astrocytomas show increased Nestin and Wilms's tumor gene (WT1) protein expression. Int J Surg Pathol 2009; 18:255-9. [PMID: 19578047 DOI: 10.1177/1066896909338596] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Wilms's tumor gene (WT1) is overexpressed in a variety of hematologic malignancies and solid tumors. Recently, WT1 protein has been considered as a molecular target of cancer immunotherapy for several solid tumors and as a tool for monitoring minimal residual disease in leukemia patients. There are only few investigations on WT1 expression in central nervous system neoplasms, which suggest that the WT1 gene may play an important role in tumorigenesis of primary astrocytic tumors and that high-grade tumors express high levels of WT1 proteins. We examined 50 low-grade and high-grade gliomas using tissue microarray and immunohistochemical methods to identify WT1 protein, P53, Ki-67, GFAP, NFP, EGFR, nestin, and Neu-N expression. WT1 and nestin shared overlapping expression in all gliomas and were increased in high-grade examples, highlighting their potential use as diagnostic and prognostic tumor markers. Our results support the combined role of WT1 and nestin in glial tumorigenesis and progression.
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Affiliation(s)
- Elisabeth J Rushing
- Department of Neuropathology and Ophthalmic Pathology, Armed Forces Institute of Pathology, Washington, DC, USA.
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12
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Kerst G, Bergold N, Viebahn S, Gieseke F, Kalinova M, Trka J, Handgretinger R, Müller I. WT1 protein expression in slowly proliferating myeloid leukemic cell lines is scarce throughout the cell cycle with a minimum in G0/G1 phase. Leuk Res 2008; 32:1393-9. [PMID: 18457871 DOI: 10.1016/j.leukres.2008.03.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2007] [Revised: 03/03/2008] [Accepted: 03/10/2008] [Indexed: 11/26/2022]
Abstract
Wilms' tumor gene 1 (WT1) is overexpressed in various hematological malignancies and has been proposed as a target for minimal residual disease (MRD) detection and for immunotherapy. Although WT1 is known as a key molecule for tumor cell proliferation, the expression pattern of WT1 in leukemic cells in dependency of proliferation has not yet been investigated. Furthermore, WT1 expression was mostly studied by reverse transcriptase PCR and the expression of WT1 protein has not been extensively studied. Here, we analyzed WT1 protein expression in the human myeloid leukemia cell lines K562 and HL-60 by indirect immunofluorescence and flow cytometry. Both cell lines exhibited varying nuclear WT1 immunoreactivity pointing to a cell cycle-dependent and/or proliferation-dependent WT1 expression. In rapidly proliferating cells high levels of WT1 protein were detected by flow cytometry. A reduced proliferation rate was associated with a low WT1 protein expression and an accumulation of cells in G(0)/G(1) phase. During G(0)/G(1) phase cells expressed WT1 at a lower level than in S or G(2)/M phase. Moreover, WT1 expression was diminished in all cell cycle phases in slowly proliferating cells. We conclude that WT1 protein expression is dependent on the cell cycle phase as well as on the proliferation rate. This finding might be relevant for MRD studies and immunotherapeutic strategies targeting WT1.
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Affiliation(s)
- Gunter Kerst
- Department of Pediatric Cardiology, University Children's Hospital Tuebingen, Hoppe-Seyler-Str. 1, 72076 Tuebingen, Germany.
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