51
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Prognostic and biological significance of the proangiogenic factor EGFL7 in acute myeloid leukemia. Proc Natl Acad Sci U S A 2017; 114:E4641-E4647. [PMID: 28533390 DOI: 10.1073/pnas.1703142114] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Epithelial growth factor-like 7 (EGFL7) is a protein that is secreted by endothelial cells and plays an important role in angiogenesis. Although EGFL7 is aberrantly overexpressed in solid tumors, its role in leukemia has not been evaluated. Here, we report that levels of both EGFL7 mRNA and EGFL7 protein are increased in blasts of patients with acute myeloid leukemia (AML) compared with normal bone marrow cells. High EGFL7 mRNA expression associates with lower complete remission rates, and shorter event-free and overall survival in older (age ≥60 y) and younger (age <60 y) patients with cytogenetically normal AML. We further show that AML blasts secrete EGFL7 protein and that higher levels of EGFL7 protein are found in the sera from AML patients than in sera from healthy controls. Treatment of patient AML blasts with recombinant EGFL7 in vitro leads to increases in leukemic blast cell growth and levels of phosphorylated AKT. EGFL7 blockade with an anti-EGFL7 antibody reduced the growth potential and viability of AML cells. Our findings demonstrate that increased EGFL7 expression and secretion is an autocrine mechanism supporting growth of leukemic blasts in patients with AML.
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52
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Siveen KS, Uddin S, Mohammad RM. Targeting acute myeloid leukemia stem cell signaling by natural products. Mol Cancer 2017; 16:13. [PMID: 28137265 PMCID: PMC5282735 DOI: 10.1186/s12943-016-0571-x] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 12/19/2016] [Indexed: 12/11/2022] Open
Abstract
Acute myeloid leukemia (AML) is the most commonly diagnosed leukemia in adults (25%) and comprises 15-20% in children. It is a genetically heterogeneous aggressive disease characterized by the accumulation of somatically acquired genetic changes, altering self-renewal, proliferation, and differentiation of hematopoietic progenitor cells, resulting in uncontrolled clonal proliferation of malignant progenitor myeloid cells in the bone marrow, peripheral blood, and occasionally in other body tissues. Treatment with modern chemotherapy regimen (cytarabine and daunorubicin) usually achieves high remission rates, still majority of patients are found to relapse, resulting in only 40-45% overall 5 year survival in young patients and less than 10% in the elderly AML patients. The leukemia stem cells (LSCs) are characterized by their unlimited self-renewal, repopulating potential and long residence in a quiescent state of G0/G1 phase. LSCs are considered to have a pivotal role in the relapse and refractory of AML. Therefore, new therapeutic strategies to target LSCs with limited toxicity towards the normal hematopoietic population is critical for the ultimate curing of AML. Ongoing research works with natural products like parthenolide (a natural plant extract derived compound) and its derivatives, that have the ability to target multiple pathways that regulate the self-renewal, growth and survival of LSCs point to ways for a possible complete remission in AML. In this review article, we will update and discuss various natural products that can target LSCs in AML.
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Affiliation(s)
- Kodappully Sivaraman Siveen
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, PO Box 3050, Doha, Qatar.
| | - Shahab Uddin
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, PO Box 3050, Doha, Qatar
| | - Ramzi M Mohammad
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, PO Box 3050, Doha, Qatar
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53
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Zebisch A, Hatzl S, Pichler M, Wölfler A, Sill H. Therapeutic Resistance in Acute Myeloid Leukemia: The Role of Non-Coding RNAs. Int J Mol Sci 2016; 17:ijms17122080. [PMID: 27973410 PMCID: PMC5187880 DOI: 10.3390/ijms17122080] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 12/01/2016] [Accepted: 12/05/2016] [Indexed: 01/12/2023] Open
Abstract
Acute myeloid leukemia (AML) is caused by malignant transformation of hematopoietic stem or progenitor cells and displays the most frequent acute leukemia in adults. Although some patients can be cured with high dose chemotherapy and allogeneic hematopoietic stem cell transplantation, the majority still succumbs to chemoresistant disease. Micro-RNAs (miRNAs) and long non-coding RNAs (lncRNAs) are non-coding RNA fragments and act as key players in the regulation of both physiologic and pathologic gene expression profiles. Aberrant expression of various non-coding RNAs proved to be of seminal importance in the pathogenesis of AML, as well in the development of resistance to chemotherapy. In this review, we discuss the role of miRNAs and lncRNAs with respect to sensitivity and resistance to treatment regimens currently used in AML and provide an outlook on potential therapeutic targets emerging thereof.
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Affiliation(s)
- Armin Zebisch
- Division of Hematology, Medical University of Graz, 8036 Graz, Austria.
| | - Stefan Hatzl
- Division of Hematology, Medical University of Graz, 8036 Graz, Austria.
| | - Martin Pichler
- Division of Oncology, Medical University of Graz, 8036 Graz, Austria.
| | - Albert Wölfler
- Division of Hematology, Medical University of Graz, 8036 Graz, Austria.
| | - Heinz Sill
- Division of Hematology, Medical University of Graz, 8036 Graz, Austria.
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54
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Roden C, Lu J. MicroRNAs in Control of Stem Cells in Normal and Malignant Hematopoiesis. CURRENT STEM CELL REPORTS 2016; 2:183-196. [PMID: 27547713 PMCID: PMC4988405 DOI: 10.1007/s40778-016-0057-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Studies on hematopoietic stem cells (HSCs) and leukemia stem cells (LSCs) have helped to establish the paradigms of normal and cancer stem cell concepts. For both HSCs and LSCs, specific gene expression programs endowed by their epigenome functionally distinguish them from their differentiated progenies. MicroRNAs (miRNAs), as a class of small non-coding RNAs, act to control post-transcriptional gene expression. Research in the past decade has yielded exciting findings elucidating the roles of miRNAs in control of multiple facets of HSC and LSC biology. Here we review recent progresses on the functions of miRNAs in HSC emergence during development, HSC switch from a fetal/neonatal program to an adult program, HSC self-renewal and quiescence, HSC aging, HSC niche, and malignant stem cells. While multiple different miRNAs regulate a diverse array of targets, two common themes emerge in HSC and LSC biology: miRNA mediated regulation of epigenetic machinery and cell signaling pathways. In addition, we propose that miRNAs themselves behave like epigenetic regulators, as they possess key biochemical and biological properties that can provide both stability and alterability to the epigenetic program. Overall, the studies of miRNAs in stem cells in the hematologic contexts not only provide key understandings to post-transcriptional gene regulation mechanisms in HSCs and LSCs, but also will lend key insights for other stem cell fields.
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Affiliation(s)
- Christine Roden
- Department of Genetics, Yale University School of Medicine, New Haven, Connecticut 06510, USA
- Yale Stem Cell Center, Yale Cancer Center, New Haven, Connecticut, 06520, USA
- Graduate Program in Biological and Biomedical Sciences, Yale University, New Haven, Connecticut 06510, USA
| | - Jun Lu
- Department of Genetics, Yale University School of Medicine, New Haven, Connecticut 06510, USA
- Yale Stem Cell Center, Yale Cancer Center, New Haven, Connecticut, 06520, USA
- Yale Center for RNA Science and Medicine, New Haven, Connecticut, 06520, USA
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55
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Elias HK, Khalaj M, Park CY. Divergent roles of miR-126 in normal and malignant stem cells. Transl Cancer Res 2016; 5:S328-S331. [PMID: 33088733 DOI: 10.21037/tcr.2016.07.15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Harold K Elias
- Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, NY, USA
| | - Mona Khalaj
- Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, NY, USA.,Weill Graduate School of Medical Sciences, Cornell University, NY, USA
| | - Christopher Y Park
- Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, NY, USA.,Weill Graduate School of Medical Sciences, Cornell University, NY, USA.,Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, NY, USA
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56
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Al-Mawali A, Gillis D, Lewis I. Immunoprofiling of leukemic stem cells CD34+/CD38-/CD123+ delineate FLT3/ITD-positive clones. J Hematol Oncol 2016; 9:61. [PMID: 27465508 PMCID: PMC4964068 DOI: 10.1186/s13045-016-0292-z] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2016] [Accepted: 07/21/2016] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Acute myeloid leukemia (AML) is a heterogeneous clonal disorder presenting with accumulation of proliferating undifferentiated blasts. Xenograft transplantation studies have demonstrated a rare population of leukemia-initiating cells called leukemic stem cells (LSCs) capable of propagating leukemia that are enriched in the CD34+/CD38- fraction. LSCs are quiescent, resistant to chemotherapy and likely responsible for relapse and therefore represent an ideal target for effective therapy. LSCs are reported to overexpress the alpha subunit of the IL-3 receptor (CD123) compared to normal CD34+/CD38- hematopoietic stem cells. It has not been demonstrated whether CD123-positive (CD34+/CD38-) subpopulation is enriched for any clonal markers of AML or any LSC properties. The aims of this study were to investigate whether FMS-like tyrosine kinase (FLT3)/internal tandem duplication (ITD) mutations are present at LSC level and whether FLT3/ITD mutation is confined to LSC as defined by CD34+/CD38-/CD123+ and not CD34+/CD38-/CD123-. METHODS Thirty-four AML cases were analyzed by five-color flow cytometry and sequential gating strategy to characterize of CD34+/CD38-/CD123+ cells. These cells were sorted, analyzed by PCR, and sequenced for FLT3/ITD. RESULTS In this study, we confirm significant expression of CD123 in 32/34 cases in the total blast population (median expression = 86 %). CD123 was also expressed in the CD34+/CD38- cells (96 ± 2 % positive) from 28/32 for CD123+ AML. CD123 was not expressed/low in normal bone marrow CD34+/CD38- cells (median expression = 0 %, range (0-.004 %). AML samples were tested for FLT3/ITD (10 positive/25). FLT3/ITD+ AML cases were sorted into two putative LSC populations according to the expression of CD123 and analyzed for FLT3/ITD again in the stem cell fractions CD34+/CD38-/CD123+ and CD34+/CD38-/CD123-. Interestingly, FLT3/ITD was only detected in CD34+/CD38-/CD123+ (7/7) and not in CD34+/CD38-/CD123- subpopulation (6/7). CONCLUSIONS This finding shows that FLT3/ITD are present at LSC level and may be a primary and not secondary event in leukemogenesis, and the oncogenic events of FLT3/ITD happen at a cell stage possessing CD123. It shows that CD123 immunoprofiling provides further delineation of FLT3+ LSC clone. This novel finding provides a rationale for treatment involving CD123-targeting antibodies with intracellular FLT3 inhibitors directed against CD34+/CD38-/CD123+. This may result in more effective anti-LSC eradication.
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Affiliation(s)
- Adhra Al-Mawali
- Division of Human Immunology and Haematology, SA Pathology, Hanson Institute, Frome Road, Adelaide, SA, 5000, Australia. .,Centre of Studies and Research, Ministry of Health, Muscat, Sultanate of Oman.
| | - David Gillis
- Division of Human Immunology and Haematology, SA Pathology, Hanson Institute, Frome Road, Adelaide, SA, 5000, Australia
| | - Ian Lewis
- Division of Human Immunology and Haematology, SA Pathology, Hanson Institute, Frome Road, Adelaide, SA, 5000, Australia
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57
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Exosomes miR-126a released from MDSC induced by DOX treatment promotes lung metastasis. Oncogene 2016; 36:639-651. [PMID: 27345402 PMCID: PMC5419051 DOI: 10.1038/onc.2016.229] [Citation(s) in RCA: 157] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 03/14/2016] [Accepted: 05/22/2016] [Indexed: 12/13/2022]
Abstract
Acquired resistance to chemotherapy remains a major stumbling block in cancer treatment. Chronic inflammation plays a crucial role in induction of chemo resistance, and results in part from the induction and expansion of inflammatory cells that include myeloid derived suppressor cells (MDSC) and IL-13+Th2 cells. The mechanisms that lead to induction of activated MDSCs and IL-13+Th2 cells have not yet been identified. Here we demonstrated that doxorubicin treatment of 4T1 breast tumor bearing mice led to the induction of IL-13R+miR-126a+MDSC (DOX-MDSC). DOX-MDSC promote breast tumor lung metastasis through MDSC miR-126a+exosomal mediated induction of IL-13+Th2 cells and tumor angiogenesis. The induction of DOX-MDSC is regulated in a paracrine manner. DOX treatment not only increases IL-33 released from breast tumor cells, which is crucial for the induction of IL-13+Th2 cells, but it also participates in the induction of IL-13 receptors and miR-126a expressed on/in the MDSCs. IL-13 released from IL-13+Th2 cells then promotes the production of DOX-MDSC and MDSC miR-126a+exosomes via MDSC IL-13R. MDSC miR-126a+exosomes further induce IL13+Th2 cells in a positive feed-back loop manner. We also showed that MDSC miR-126a rescues doxorubicin induced MDSC death in a S100A8/A9 dependent manner and promotes tumor angiogenesis. Our findings provide insight into the MDSC exosomal mediated chemo resistance mechanism, which will be useful for the design of inhibitors targeting the blocking of induction of miR-126a+MDSC.
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58
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Nucera S, Giustacchini A, Boccalatte F, Calabria A, Fanciullo C, Plati T, Ranghetti A, Garcia-Manteiga J, Cittaro D, Benedicenti F, Lechman ER, Dick JE, Ponzoni M, Ciceri F, Montini E, Gentner B, Naldini L. miRNA-126 Orchestrates an Oncogenic Program in B Cell Precursor Acute Lymphoblastic Leukemia. Cancer Cell 2016; 29:905-921. [PMID: 27300437 DOI: 10.1016/j.ccell.2016.05.007] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 01/12/2016] [Accepted: 05/18/2016] [Indexed: 12/11/2022]
Abstract
MicroRNA (miRNA)-126 is a known regulator of hematopoietic stem cell quiescence. We engineered murine hematopoiesis to express miRNA-126 across all differentiation stages. Thirty percent of mice developed monoclonal B cell leukemia, which was prevented or regressed when a tetracycline-repressible miRNA-126 cassette was switched off. Regression was accompanied by upregulation of cell-cycle regulators and B cell differentiation genes, and downregulation of oncogenic signaling pathways. Expression of dominant-negative p53 delayed blast clearance upon miRNA-126 switch-off, highlighting the relevance of p53 inhibition in miRNA-126 addiction. Forced miRNA-126 expression in mouse and human progenitors reduced p53 transcriptional activity through regulation of multiple p53-related targets. miRNA-126 is highly expressed in a subset of human B-ALL, and antagonizing miRNA-126 in ALL xenograft models triggered apoptosis and reduced disease burden.
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Affiliation(s)
- Silvia Nucera
- San Raffaele Telethon Institute for Gene Therapy, 20132 Milan, Italy
| | - Alice Giustacchini
- San Raffaele Telethon Institute for Gene Therapy, 20132 Milan, Italy; Vita Salute San Raffaele University, 20132 Milan, Italy
| | - Francesco Boccalatte
- San Raffaele Telethon Institute for Gene Therapy, 20132 Milan, Italy; Vita Salute San Raffaele University, 20132 Milan, Italy
| | - Andrea Calabria
- San Raffaele Telethon Institute for Gene Therapy, 20132 Milan, Italy
| | - Cristiana Fanciullo
- San Raffaele Telethon Institute for Gene Therapy, 20132 Milan, Italy; Vita Salute San Raffaele University, 20132 Milan, Italy
| | - Tiziana Plati
- San Raffaele Telethon Institute for Gene Therapy, 20132 Milan, Italy
| | - Anna Ranghetti
- San Raffaele Telethon Institute for Gene Therapy, 20132 Milan, Italy
| | - Jose Garcia-Manteiga
- Centre for Translational Genomics and Bioinformatics, IRCSS Ospedale San Raffaele, 20132 Milan, Italy
| | - Davide Cittaro
- Centre for Translational Genomics and Bioinformatics, IRCSS Ospedale San Raffaele, 20132 Milan, Italy
| | | | - Eric R Lechman
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - John E Dick
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Maurilio Ponzoni
- Vita Salute San Raffaele University, 20132 Milan, Italy; Pathology Unit, IRCSS Ospedale San Raffaele, 20132 Milan, Italy
| | - Fabio Ciceri
- Vita Salute San Raffaele University, 20132 Milan, Italy; Hematology and Bone Marrow Transplantation Unit, IRCSS Ospedale San Raffaele, 20132 Milan, Italy
| | - Eugenio Montini
- San Raffaele Telethon Institute for Gene Therapy, 20132 Milan, Italy
| | - Bernhard Gentner
- San Raffaele Telethon Institute for Gene Therapy, 20132 Milan, Italy; Hematology and Bone Marrow Transplantation Unit, IRCSS Ospedale San Raffaele, 20132 Milan, Italy.
| | - Luigi Naldini
- San Raffaele Telethon Institute for Gene Therapy, 20132 Milan, Italy; Vita Salute San Raffaele University, 20132 Milan, Italy.
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59
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Yeh CH, Moles R, Nicot C. Clinical significance of microRNAs in chronic and acute human leukemia. Mol Cancer 2016; 15:37. [PMID: 27179712 PMCID: PMC4867976 DOI: 10.1186/s12943-016-0518-2] [Citation(s) in RCA: 109] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Accepted: 05/01/2016] [Indexed: 01/01/2023] Open
Abstract
Small non-coding microRNAs (miRNAs) are epigenetic regulators that target specific cellular mRNA to modulate gene expression patterns and cellular signaling pathways. miRNAs are involved in a wide range of biological processes and are frequently deregulated in human cancers. Numerous miRNAs promote tumorigenesis and cancer progression by enhancing tumor growth, angiogenesis, invasion and immune evasion, while others have tumor suppressive effects (Hayes, et al., Trends Mol Med 20(8): 460-9, 2014; Stahlhut and Slack, Genome Med 5 (12): 111, 2013). The expression profile of cancer miRNAs can be used to predict patient prognosis and clinical response to treatment (Bouchie, Nat Biotechnol 31(7): 577, 2013). The majority of miRNAs are intracellular localized, however circulating miRNAs have been detected in various body fluids and represent new biomarkers of solid and hematologic cancers (Fabris and Calin, Mol Oncol 10(3):503-8, 2016; Allegra, et al., Int J Oncol 41(6): 1897-912, 2012). This review describes the clinical relevance of miRNAs, lncRNAs and snoRNAs in the diagnosis, prognosis and treatment response in patients with chronic lymphocytic leukemia (CLL), chronic myeloid leukemia (CML), acute lymphocytic leukemia (ALL), acute myeloid leukemia (AML) and acute adult T-cell leukemia (ATL).
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Affiliation(s)
- Chien-Hung Yeh
- Department of Pathology, Center for Viral Oncology, University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA
| | - Ramona Moles
- Department of Pathology, Center for Viral Oncology, University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA
| | - Christophe Nicot
- Department of Pathology, Center for Viral Oncology, University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.
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60
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Halle B, Thomassen M, Venkatesan R, Kaimal V, Marcusson EG, Munthe S, Sørensen MD, Aaberg-Jessen C, Jensen SS, Meyer M, Kruse TA, Christiansen H, Schmidt S, Mollenhauer J, Schulz MK, Andersen C, Kristensen BW. Shift of microRNA profile upon orthotopic xenografting of glioblastoma spheroid cultures. J Neurooncol 2016; 128:395-404. [PMID: 27063952 DOI: 10.1007/s11060-016-2125-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 04/07/2016] [Indexed: 11/30/2022]
Abstract
Glioblastomas always recur despite surgery, radiotherapy and chemotherapy. A key player in the therapeutic resistance may be immature tumor cells with stem-like properties (TSCs) escaping conventional treatment. A group of promising molecular targets are microRNAs (miRs). miRs are small non-coding RNAs exerting post-transcriptional regulation of gene expression. In this study we aimed to identify over-expressed TSC-related miRs potentially amenable for therapeutic targeting. We used non-differentiated glioblastoma spheroid cultures (GSCs) containing TSCs and compared these to xenografts using a NanoString nCounter platform. This revealed 19 over-expressed miRs in the non-differentiated GSCs. Additionally, non-differentiated GSCs were compared to neural stem cells (NSCs) using a microarray platform. This revealed four significantly over-expressed miRs in the non-differentiated GSCs in comparison to the NSCs. The three most over-expressed miRs in the non-differentiated GSCs compared to xenografts were miR-126, -137 and -128. KEGG pathway analysis suggested the main biological function of these over-expressed miRs to be cell-cycle arrest and diminished proliferation. To functionally validate the profiling results suggesting association of these miRs with stem-like properties, experimental over-expression of miR-128 was performed. A consecutive limiting dilution assay confirmed a significantly elevated spheroid formation in the miR-128 over-expressing cells. This may provide potential therapeutic targets for anti-miRs to identify novel treatment options for GBM patients.
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Affiliation(s)
- Bo Halle
- Department of Pathology, Odense University Hospital, Winsløwparken 15, 5000, Odense C, Denmark. .,Department of Neurosurgery, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark. .,Institute of Clinical Research, University of Southern Denmark, Winsløwparken 19.3, 5000, Odense C, Denmark.
| | - Mads Thomassen
- Institute of Clinical Research, University of Southern Denmark, Winsløwparken 19.3, 5000, Odense C, Denmark.,Department of Clinical Genetics, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark
| | - Ranga Venkatesan
- Regulus Therapeutics, 3545 John Hopkins Ct., Suite 210, San Diego, CA, 92121-1121, USA
| | - Vivek Kaimal
- Regulus Therapeutics, 3545 John Hopkins Ct., Suite 210, San Diego, CA, 92121-1121, USA
| | - Eric G Marcusson
- Regulus Therapeutics, 3545 John Hopkins Ct., Suite 210, San Diego, CA, 92121-1121, USA
| | - Sune Munthe
- Department of Pathology, Odense University Hospital, Winsløwparken 15, 5000, Odense C, Denmark.,Department of Neurosurgery, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark.,Institute of Clinical Research, University of Southern Denmark, Winsløwparken 19.3, 5000, Odense C, Denmark
| | - Mia D Sørensen
- Department of Pathology, Odense University Hospital, Winsløwparken 15, 5000, Odense C, Denmark.,Institute of Clinical Research, University of Southern Denmark, Winsløwparken 19.3, 5000, Odense C, Denmark
| | - Charlotte Aaberg-Jessen
- Department of Nuclear Medicine, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark
| | - Stine S Jensen
- Department of Pathology, Odense University Hospital, Winsløwparken 15, 5000, Odense C, Denmark.,Institute of Clinical Research, University of Southern Denmark, Winsløwparken 19.3, 5000, Odense C, Denmark
| | - Morten Meyer
- Department of Neurobiology Research, Institute of Molecular Medicine, University of Southern Denmark, Winsløwparken 21, 5000, Odense C, Denmark
| | - Torben A Kruse
- Institute of Clinical Research, University of Southern Denmark, Winsløwparken 19.3, 5000, Odense C, Denmark.,Department of Clinical Genetics, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark
| | - Helle Christiansen
- Faculty of Health Sciences, Lundbeckfonden Center of Excellence NanoCAN and Molecular Oncology, Institute of Molecular Medicine, University of Southern Denmark, Winsløwparken 25, 5000, Odense C, Denmark
| | - Steffen Schmidt
- Faculty of Health Sciences, Lundbeckfonden Center of Excellence NanoCAN and Molecular Oncology, Institute of Molecular Medicine, University of Southern Denmark, Winsløwparken 25, 5000, Odense C, Denmark
| | - Jan Mollenhauer
- Faculty of Health Sciences, Lundbeckfonden Center of Excellence NanoCAN and Molecular Oncology, Institute of Molecular Medicine, University of Southern Denmark, Winsløwparken 25, 5000, Odense C, Denmark
| | - Mette K Schulz
- Department of Neurosurgery, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark.,Institute of Clinical Research, University of Southern Denmark, Winsløwparken 19.3, 5000, Odense C, Denmark
| | - Claus Andersen
- Department of Neurosurgery, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark.,Institute of Clinical Research, University of Southern Denmark, Winsløwparken 19.3, 5000, Odense C, Denmark
| | - Bjarne W Kristensen
- Department of Pathology, Odense University Hospital, Winsløwparken 15, 5000, Odense C, Denmark.,Institute of Clinical Research, University of Southern Denmark, Winsløwparken 19.3, 5000, Odense C, Denmark
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Li X, Zhong H. The diagnosis, prognosis, and therapeutic application of MicroRNAs in haematological malignancies. ACTA ACUST UNITED AC 2016; 21:263-71. [PMID: 26907667 DOI: 10.1080/10245332.2015.1114766] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
OBJECTIVE MicroRNAs (miRNAs) are small noncoding RNA molecules that participate in vital cell processes such as proliferation, apoptosis, and differentiation. In recent years, they have been proven to play vital roles in haematological malignancies. In this review we briefly introduce some basic knowledge of microRNAs and summarize their ectopic expression in haematological malignancies, especially in leukaemia. We will also discuss the potential of microRNAs in the diagnosis of leukaemia, in the determination of the clinical prognosis of diverse subtypes, and in targeted therapy. DISCUSSION Despite current adoption of novel biological agents combining traditional chemotherapy regimens, leukaemia remains to have undesirable clinical outcomes due to inaccurate diagnosis, invasiveness of the disease, and patients' intolerance to chemotherapy, thus brand new therapeutic directions are urgently needed. MiRNAs regulate gene expression by means of binding to the 3'-untranslated regions of corresponding mRNAs, leading to the degradation of targeted mRNA or the inhibition of translation. It has been confirmed that they can either function as tumour inhibitors, or may trigger tumourigenesis in certain situations, this specific dual characteristic undoubtedly attract scientists to explore their roles in haematological malignancies. It is of great necessity to summarize the roles of miRNAs in haematological malignancies diagnosis, prognosis evaluation, and clinical treatment. CONCLUSIONS Future studies may take full advantage of miRNAs detection in diagnosing, in choosing targeted biological therapy, and in avoiding predictable side effect, thus the overall survival rate and cure efficiency of leukaemia should improve.
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Affiliation(s)
- Xin Li
- a Department of Hematology, Ren Ji Hospital, School of Medicine , Shanghai Jiao Tong University , P.R. China
| | - Hua Zhong
- a Department of Hematology, Ren Ji Hospital, School of Medicine , Shanghai Jiao Tong University , P.R. China
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62
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Abstract
Leukemic stem cells (LSCs) are resistant to conventional chemotherapy and promote acute myeloid leukemia (AML) progression and recurrence. In this issue of Cancer Cell, Lechman and colleagues (2016) identify the microRNA miR-126 as a regulator of PI3K-AKT-mTOR and CDK3 signaling driving LSC self-renewal and chemotherapy resistance.
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Affiliation(s)
- Simon Raffel
- Heidelberg Institute for Stem Cell Technology and Experimental Medicine (HI-STEM gGmbH), 69120 Heidelberg, Germany; Division of Stem Cells and Cancer, Deutsches Krebsforschungszentrum (DKFZ), 69120 Heidelberg, Germany
| | - Andreas Trumpp
- Heidelberg Institute for Stem Cell Technology and Experimental Medicine (HI-STEM gGmbH), 69120 Heidelberg, Germany; Division of Stem Cells and Cancer, Deutsches Krebsforschungszentrum (DKFZ), 69120 Heidelberg, Germany.
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63
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Lechman ER, Gentner B, Ng SWK, Schoof EM, van Galen P, Kennedy JA, Nucera S, Ciceri F, Kaufmann KB, Takayama N, Dobson SM, Trotman-Grant A, Krivdova G, Elzinga J, Mitchell A, Nilsson B, Hermans KG, Eppert K, Marke R, Isserlin R, Voisin V, Bader GD, Zandstra PW, Golub TR, Ebert BL, Lu J, Minden M, Wang JCY, Naldini L, Dick JE. miR-126 Regulates Distinct Self-Renewal Outcomes in Normal and Malignant Hematopoietic Stem Cells. Cancer Cell 2016; 29:214-28. [PMID: 26832662 PMCID: PMC4749543 DOI: 10.1016/j.ccell.2015.12.011] [Citation(s) in RCA: 155] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 07/13/2015] [Accepted: 12/21/2015] [Indexed: 12/16/2022]
Abstract
To investigate miRNA function in human acute myeloid leukemia (AML) stem cells (LSC), we generated a prognostic LSC-associated miRNA signature derived from functionally validated subpopulations of AML samples. For one signature miRNA, miR-126, high bioactivity aggregated all in vivo patient sample LSC activity into a single sorted population, tightly coupling miR-126 expression to LSC function. Through functional studies, miR-126 was found to restrain cell cycle progression, prevent differentiation, and increase self-renewal of primary LSC in vivo. Compared with prior results showing miR-126 regulation of normal hematopoietic stem cell (HSC) cycling, these functional stem effects are opposite between LSC and HSC. Combined transcriptome and proteome analysis demonstrates that miR-126 targets the PI3K/AKT/MTOR signaling pathway, preserving LSC quiescence and promoting chemotherapy resistance.
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Affiliation(s)
- Eric R Lechman
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Bernhard Gentner
- San Raffaele Telethon Institute for Gene Therapy, San Raffaele Hospital, Milan 20132, Italy; Vita Salute San Raffaele University, San Raffaele Scientific Institute, San Raffaele Hospital, Milan 20132, Italy; Hematology and Bone Marrow Transplantation Unit, San Raffaele Hospital, Milan 20132, Italy
| | - Stanley W K Ng
- Department of Chemical Engineering and Applied Chemistry, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON M5G 2M9, Canada; The Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Erwin M Schoof
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Peter van Galen
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - James A Kennedy
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Medicine, University of Toronto, Toronto, ON M5G 2M9, Canada
| | - Silvia Nucera
- San Raffaele Telethon Institute for Gene Therapy, San Raffaele Hospital, Milan 20132, Italy; Vita Salute San Raffaele University, San Raffaele Scientific Institute, San Raffaele Hospital, Milan 20132, Italy
| | - Fabio Ciceri
- Vita Salute San Raffaele University, San Raffaele Scientific Institute, San Raffaele Hospital, Milan 20132, Italy; Hematology and Bone Marrow Transplantation Unit, San Raffaele Hospital, Milan 20132, Italy
| | - Kerstin B Kaufmann
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Naoya Takayama
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Stephanie M Dobson
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Aaron Trotman-Grant
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Gabriela Krivdova
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Janneke Elzinga
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Amanda Mitchell
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Björn Nilsson
- Department of Hematology and Transfusion Medicine, Lund University Hospital, Lund 221 84, Sweden
| | - Karin G Hermans
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Kolja Eppert
- Department of Pediatrics, McGill University and The Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada
| | - Rene Marke
- Laboratory of Pediatric Oncology, Radboud University Medical Center, Nijmegen, 6500 HB, Netherlands
| | - Ruth Isserlin
- The Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Veronique Voisin
- The Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Gary D Bader
- The Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Peter W Zandstra
- Department of Chemical Engineering and Applied Chemistry, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON M5G 2M9, Canada; The Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Todd R Golub
- Department of Pediatric Oncology, Dana-Farber Cancer Institute, 44 Binney Street, Boston, MA 02115, USA
| | - Benjamin L Ebert
- Division of Hematology, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Jun Lu
- Yale Stem Cell Center, Yale Cancer Center, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Mark Minden
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Medicine, University of Toronto, Toronto, ON M5G 2M9, Canada
| | - Jean C Y Wang
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Medicine, University of Toronto, Toronto, ON M5G 2M9, Canada
| | - Luigi Naldini
- San Raffaele Telethon Institute for Gene Therapy, San Raffaele Hospital, Milan 20132, Italy; Vita Salute San Raffaele University, San Raffaele Scientific Institute, San Raffaele Hospital, Milan 20132, Italy
| | - John E Dick
- Princess Margaret Cancer Centre, University Health Network, University of Toronto, Toronto, ON M5G 1L7, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada; Princess Margaret Cancer Research Tower, Room 8-301, 101 College Street, Toronto M5G 1L7, Canada.
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64
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Dong Y, Fu C, Guan H, Zhang Z, Zhou T, Li B. Prognostic significance of miR-126 in various cancers: a meta-analysis. Onco Targets Ther 2016; 9:2547-55. [PMID: 27217773 PMCID: PMC4853159 DOI: 10.2147/ott.s103481] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
OBJECTIVE Recent studies have demonstrated that microRNA-126 (miR-126) might be a promising prognostic factor for cancer patients. This meta-analysis was conducted to assess the effectiveness of miR-126 as a prognostic biomarker for various cancers. METHODS The search of studies was performed by using PubMed and Embase until January 22, 2016. Pooled hazard ratio (HR) with 95% confidence interval (CI) for patients' survival was calculated. A fixed-effect or random-effects model was applied according to heterogeneity. The trim and fill method was used to adjust pooled HR. RESULTS In all 17 articles comprising of 2,437 participants were included in this meta-analysis. The results indicated that a high level of miR-126 played a favorable role in the overall survival (HR 0.70, 95% CI: 0.62-0.79, random-effects model), with a heterogeneity measure index of I (2)=63.2% (P<0.01). Subgroup analyses showed that pooled HR was more significant in patients with digestive system cancers (HR 0.70, 95% CI: 0.59-0.83, fixed-effects model) and respiratory system cancers (HR 0.71, 95% CI: 0.59-0.85, random-effects model). Owing to publication bias, HR was adjusted to 0.59 (0.463-0.752, P<0.01) by the trim and fill method. CONCLUSION miR-126 could be a promising biomarker for cancer prognosis prediction, especially in patients with digestive or respiratory system cancers.
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Affiliation(s)
- Yuanli Dong
- School of Medicine and Life Sciences, University of Jinan, Shandong Academy of Medical Sciences, Jinan, Shandong Province, People’s Republic of China
- Sixth Department of Radiation Oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong Province, People’s Republic of China
| | - Chengrui Fu
- Sixth Department of Radiation Oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong Province, People’s Republic of China
| | - Hui Guan
- Sixth Department of Radiation Oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong Province, People’s Republic of China
| | - Zicheng Zhang
- Sixth Department of Radiation Oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong Province, People’s Republic of China
| | - Tao Zhou
- Sixth Department of Radiation Oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong Province, People’s Republic of China
| | - Baosheng Li
- Sixth Department of Radiation Oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong Province, People’s Republic of China
- Correspondence: Baosheng Li, Sixth Department of Radiation Oncology, Shandong Cancer Hospital and Institute, 440 Jiyan Road, Jinan 250117, Shandong Province, People’s Republic of China, Tel +86 139 5416 8847, Fax +86 531 6762 6161, Email
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65
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Tian C, You MJ, Yu Y, Zhu L, Zheng G, Zhang Y. MicroRNA-9 promotes proliferation of leukemia cells in adult CD34-positive acute myeloid leukemia with normal karyotype by downregulation of Hes1. Tumour Biol 2015; 37:7461-71. [PMID: 26678889 DOI: 10.1007/s13277-015-4581-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 12/02/2015] [Indexed: 11/28/2022] Open
Abstract
Acute myeloid leukemia (AML) is a group of heterogeneous hematopoietic malignancies sustained by leukemic stem cells (LSCs) that can resist treatment. Previously, we found that low expression of Hes1 was a poor prognostic factor for AML. However, the activation status of Hes1 and its regulation in LSCs and leukemic progenitors (LPs) as well as normal hematopoietic stem cells (HSCs) in Hes1-low AML patients have not been elucidated. In this study, the expression of Hes1 in LSCs and LPs was analyzed in adult CD34(+) Hes1-low AML with normal karyotype and the upstream microRNA (miRNA) regulators were screened. Our results showed that the level of either Hes1 or p21 was lower in LSCs or LPs than in HSCs whereas the level of miR-9 was highest in LPs and lowest in HSCs. An inverse correlation was observed in the expression of Hes1 and miR-9. Furthermore, we validated miR-9 as one of the regulators of Hes1 by reporter gene analysis. Knockdown of miR-9 by lentivirus infection suppressed the proliferation of AML cells by the induction of G0 arrest and apoptosis in vitro. Moreover, knockdown of miR-9 resulted in decreased circulating leukemic cell counts in peripheral blood and bone marrow, attenuated splenomegaly, and prolonged survival in a xenotransplant mouse model. Our results indicate that the miR-9 plays an important role in supporting AML cell growth and survival by downregulation of Hes1 and that miR-9 has potential as a therapeutic target for treating AML.
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MESH Headings
- Adult
- Aged
- Animals
- Antigens, CD34/metabolism
- Apoptosis
- Biomarkers, Tumor/genetics
- Biomarkers, Tumor/metabolism
- Blotting, Western
- Cell Cycle
- Cell Proliferation
- Down-Regulation
- Female
- Follow-Up Studies
- Hematopoietic Stem Cells/metabolism
- Hematopoietic Stem Cells/pathology
- Humans
- Karyotype
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/metabolism
- Leukemia, Myeloid, Acute/pathology
- Male
- Mice
- Mice, Inbred NOD
- Mice, SCID
- MicroRNAs/genetics
- Middle Aged
- Neoplasm Staging
- Neoplastic Stem Cells/metabolism
- Neoplastic Stem Cells/pathology
- Prognosis
- RNA, Messenger/genetics
- Real-Time Polymerase Chain Reaction
- Reverse Transcriptase Polymerase Chain Reaction
- Transcription Factor HES-1/genetics
- Transcription Factor HES-1/metabolism
- Tumor Cells, Cultured
- Xenograft Model Antitumor Assays
- Young Adult
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Affiliation(s)
- Chen Tian
- Department of Hematology, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin, 300060, People's Republic of China
| | - M James You
- Department of Hematopathology, Division of Pathology and Laboratory Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Yong Yu
- Department of Hematology, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin, 300060, People's Republic of China
| | - Lei Zhu
- Department of Hematology, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin, 300060, People's Republic of China
| | - Guoguang Zheng
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, 300020, People's Republic of China.
| | - Yizhuo Zhang
- Department of Hematology, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin, 300060, People's Republic of China.
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66
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Function and significance of MicroRNAs in benign and malignant human stem cells. Semin Cancer Biol 2015; 35:200-11. [DOI: 10.1016/j.semcancer.2015.07.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 07/09/2015] [Accepted: 07/13/2015] [Indexed: 12/16/2022]
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67
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Hong SH, Kim KS, Oh IH. Concise review: Exploring miRNAs--toward a better understanding of hematopoiesis. Stem Cells 2015; 33:1-7. [PMID: 25132287 DOI: 10.1002/stem.1810] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 07/14/2014] [Indexed: 12/12/2022]
Abstract
Hematopoiesis is governed by a multidimensional regulatory network involving both intrinsic and extrinsic factors that control self-renewal and differentiation of hematopoietic stem cells (HSCs) through the coordination of influences that affect cell fate. Increasing evidence indicates that microRNAs (miRNAs), short noncoding RNAs of approximately 22 nucleotides, play a central role in orchestrating these regulatory mechanisms to modulate the multiple entities of hematopoietic function in a cell-type specific manner, including self-renewal, lineage commitment, and survival of HSCs as well as their microenvironmental crosstalk. Here, we summarize the current understanding regarding the regulatory effects of miRNA on hematopoietic cells, thus enlightening their role in fine-tuning HSC function and hematopoietic homeostasis.
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Affiliation(s)
- Seok-Ho Hong
- Department of Internal Medicine, School of Medicine, Stem Cell Institute, Kangwon National University, Chuncheon, South Korea
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68
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A simple one-tube assay for immunophenotypical quantification of leukemic stem cells in acute myeloid leukemia. Leukemia 2015; 30:439-46. [PMID: 26437777 DOI: 10.1038/leu.2015.252] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 08/30/2015] [Accepted: 09/07/2015] [Indexed: 01/01/2023]
Abstract
Relapses after initial successful treatment in acute myeloid leukemia are thought to originate from the outgrowth of leukemic stem cells. Their flow cytometrically assessed frequency is of importance for relapse prediction and is therefore assumed to be implemented in future risk group profiling. Since current detection methods are complex, time- and bone marrow consuming (multiple-tubes approach), it would be advantageous to have a broadly applicable approach that enables to quantify leukemia stem cells both at diagnosis and follow-up. We compared 15 markers in 131 patients concerning their prevalence, usefulness and stability in CD34(+)CD38(-) leukemic stem cell detection in healthy controls, acute myeloid leukemia diagnosis and follow-up samples. Ultimately, we designed a single 8-color detection tube including common markers CD45, CD34 and CD38, and specific markers CD45RA, CD123, CD33, CD44 and a marker cocktail (CLL-1/TIM-3/CD7/CD11b/CD22/CD56) in one fluorescence channel. Validation analyses in 31 patients showed that the single tube approach was as good as the multiple-tube approach. Our approach requires the least possible amounts of bone marrow, and is suitable for multi-institutional studies. Moreover, it enables detection of leukemic stem cells both at time of diagnosis and follow-up, thereby including initially low-frequency populations emerging under therapy pressure.
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69
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Overexpression and knockout of miR-126 both promote leukemogenesis. Blood 2015; 126:2005-15. [PMID: 26361793 DOI: 10.1182/blood-2015-04-639062] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2015] [Accepted: 09/04/2015] [Indexed: 12/16/2022] Open
Abstract
It is generally assumed that gain- and loss-of-function manipulations of a functionally important gene should lead to the opposite phenotypes. We show in this study that both overexpression and knockout of microRNA (miR)-126 surprisingly result in enhanced leukemogenesis in cooperation with the t(8;21) fusion genes AML1-ETO/RUNX1-RUNX1T1 and AML1-ETO9a (a potent oncogenic isoform of AML1-ETO). In accordance with our observation that increased expression of miR-126 is associated with unfavorable survival in patients with t(8;21) acute myeloid leukemia (AML), we show that miR-126 overexpression exhibits a stronger effect on long-term survival and progression of AML1-ETO9a-mediated leukemia stem cells/leukemia initiating cells (LSCs/LICs) in mice than does miR-126 knockout. Furthermore, miR-126 knockout substantially enhances responsiveness of leukemia cells to standard chemotherapy. Mechanistically, miR-126 overexpression activates genes that are highly expressed in LSCs/LICs and/or primitive hematopoietic stem/progenitor cells, likely through targeting ERRFI1 and SPRED1, whereas miR-126 knockout activates genes that are highly expressed in committed, more differentiated hematopoietic progenitor cells, presumably through inducing FZD7 expression. Our data demonstrate that miR-126 plays a critical but 2-faceted role in leukemia and thereby uncover a new layer of miRNA regulation in cancer. Moreover, because miR-126 depletion can sensitize AML cells to standard chemotherapy, our data also suggest that miR-126 represents a promising therapeutic target.
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70
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Prognostic Role of MicroRNA-126 for Survival in Malignant Tumors: A Systematic Review and Meta-Analysis. DISEASE MARKERS 2015; 2015:739469. [PMID: 26351404 PMCID: PMC4553299 DOI: 10.1155/2015/739469] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 07/28/2015] [Indexed: 12/20/2022]
Abstract
Background. Increasing studies found that miR-126 expression may be associated with the prognosis of cancers. Here, we performed a meta-analysis to assess the prognostic role of miR-126 in different cancers. Methods. Eligible studies were identified by searching in PubMed, Embase, the Cochrane Library, CNKI, and Wan Fang databases up to March 2015. Pooled hazard ratios (HRs) and their corresponding 95% confidence intervals (CIs) were calculated to investigate the correlation between miR-126 and survival of cancers. Results. Thirty studies including a total of 4497 participants were enrolled in this meta-analysis. The pooled results showed that high level of miR-126 was a predictor for favorable survival of carcinomas, with pooled HR of 0.77 (95% CI 0.64–0.93) for OS, 0.64 (95%CI 0.48–0.85) for DFS, and 0.70 (95% CI 0.50–0.98) for PFS/RFS/DSS. However, high level of circulating miR-126 predicted a significantly worse OS in patients with cancer (HR = 1.65, 95% CI 1.09–2.51). Conclusions. Our results indicated that miR-126 could act as a significant biomarker in the prognosis of various cancers.
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71
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MicroRNA-551b is highly expressed in hematopoietic stem cells and a biomarker for relapse and poor prognosis in acute myeloid leukemia. Leukemia 2015; 30:742-6. [PMID: 26108690 DOI: 10.1038/leu.2015.160] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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72
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Dorrance AM, Neviani P, Ferenchak GJ, Huang X, Nicolet D, Maharry KS, Ozer HG, Hoellarbauer P, Khalife J, Hill EB, Yadav M, Bolon BN, Lee RJ, Lee LJ, Croce CM, Garzon R, Caligiuri MA, Bloomfield CD, Marcucci G. Targeting leukemia stem cells in vivo with antagomiR-126 nanoparticles in acute myeloid leukemia. Leukemia 2015; 29:2143-53. [PMID: 26055302 PMCID: PMC4633325 DOI: 10.1038/leu.2015.139] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 04/15/2015] [Accepted: 05/06/2015] [Indexed: 12/31/2022]
Abstract
Current treatments for acute myeloid leukemia (AML) are designed to target rapidly dividing blast populations with limited success in eradicating the functionally distinct leukemia stem cell (LSC) population, which is postulated to be responsible for disease resistance and relapse. We have previously reported high miR-126 expression levels to be associated with a LSC-gene expression profile. Therefore, we hypothesized that miR-126 contributes to “stemness” and is a viable target for eliminating the LSC in AML. Here we first validate the clinical relevance of miR-126 expression in AML by showing that higher expression of this microRNA (miR) is associated with worse outcome in a large cohort of older (≥60 years) cytogenetically normal AML patients treated with conventional chemotherapy. We then show that miR-126 overexpression characterizes AML LSC-enriched cell subpopulations and contributes to LSC long-term maintenance and self-renewal. Finally, we demonstrate the feasibility of therapeutic targeting of miR-126 in LSCs with novel targeting nanoparticles (NP) containing antagomiR-126 resulting in in vivo reduction of LSCs likely by depletion of the quiescent cell subpopulation. Our findings suggest that by targeting a single miR, i.e., miR-126, it is possible to interfere with LSC activity, thereby opening potentially novel therapeutic approaches to treat AML patients.
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Affiliation(s)
- A M Dorrance
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Comprehensive Cancer Center, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA
| | - P Neviani
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Comprehensive Cancer Center, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA
| | - G J Ferenchak
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Comprehensive Cancer Center, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA
| | - X Huang
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Comprehensive Cancer Center, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Nanoscale Science and Engineering Center for Affordable Nanoengineering of Polymeric Biomedical Devices, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Department of Biomedical Informatics, Ohio State University, Columbus, OH, USA
| | - D Nicolet
- Comprehensive Cancer Center, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Alliance for Clinical Trials in Oncology Statistics and Data Center, Mayo Clinic, Rochester, MN, USA
| | - K S Maharry
- Comprehensive Cancer Center, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Alliance for Clinical Trials in Oncology Statistics and Data Center, Mayo Clinic, Rochester, MN, USA
| | - H G Ozer
- Department of Biomedical Informatics, Ohio State University, Columbus, OH, USA
| | - P Hoellarbauer
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Comprehensive Cancer Center, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA
| | - J Khalife
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Comprehensive Cancer Center, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA
| | - E B Hill
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Comprehensive Cancer Center, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA
| | - M Yadav
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Comprehensive Cancer Center, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA
| | - B N Bolon
- Comparative Pathology and Mouse Phenotyping Shared Resource, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA
| | - R J Lee
- Nanoscale Science and Engineering Center for Affordable Nanoengineering of Polymeric Biomedical Devices, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Department of Biomedical Informatics, Ohio State University, Columbus, OH, USA
| | - L J Lee
- Nanoscale Science and Engineering Center for Affordable Nanoengineering of Polymeric Biomedical Devices, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Department of Biomedical Informatics, Ohio State University, Columbus, OH, USA
| | - C M Croce
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Gehr Family Center for Leukemia Research, City of Hope, Duarte, CA, USA
| | - R Garzon
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Comprehensive Cancer Center, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Gehr Family Center for Leukemia Research, City of Hope, Duarte, CA, USA
| | - M A Caligiuri
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Comprehensive Cancer Center, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA
| | - C D Bloomfield
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA.,Comprehensive Cancer Center, Department of Internal Medicine, The Ohio State University, Columbus, OH, USA
| | - G Marcucci
- Gehr Family Center for Leukemia Research, City of Hope, Duarte, CA, USA
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73
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Yang T, Rycaj K. Targeted therapy against cancer stem cells. Oncol Lett 2015; 10:27-33. [PMID: 26170972 DOI: 10.3892/ol.2015.3172] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Accepted: 04/21/2015] [Indexed: 01/05/2023] Open
Abstract
Research into cancer stem cells (CSCs), which have the ability to self-renew and give rise to more mature (differentiated) cancer cells, and which may be the cells responsible for the overall organization of a tumor, has progressed rapidly and concomitantly with recent advances in studies of normal tissue stem cells. CSCs have been reported in a wide spectrum of human tumors. Like normal tissue stem cells, CSCs similarly exhibit significant phenotypic and functional heterogeneity. The ability of CSCs to self-renew results in the immortality of malignant cells at the population level, whereas the ability of CSCs to differentiate, either fully or partially, generates the cellular hierarchy and heterogeneity commonly observed in solid tumors. CSCs also appear to have maximized their pro-survival mechanisms leading to their relative resistance to anti-cancer therapies and subsequent relapse. Studies in animal models of human cancers have also provided insight into the heterogeneity and characteristics of CSCs, helping to establish a platform for the development of novel targeted therapies against specific CSCs. In the present study, we briefly review the most recent progress in dissecting CSC heterogeneity and targeting CSCs in various human tumor systems. We also highlight a few examples of CSC-targeted drug development and clinical trials, with the ultimate aim of developing more effective therapeutic regimens that are capable of preventing tumor recurrence and metastasis.
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Affiliation(s)
- Tao Yang
- Research Center for Translational Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, P.R. China
| | - Kiera Rycaj
- Department of Molecular Carcinogenesis, The University of Texas MD Anderson Cancer Center, Smithville, TX 78957, USA
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74
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Fallah P, Amirizadeh N, Poopak B, Toogeh G, Arefian E, Kohram F, Hosseini Rad SMA, Kohram M, Teimori Naghadeh H, Soleimani M. Expression pattern of key microRNAs in patients with newly diagnosed chronic myeloid leukemia in chronic phase. Int J Lab Hematol 2015; 37:560-8. [PMID: 25833191 DOI: 10.1111/ijlh.12351] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Accepted: 02/09/2015] [Indexed: 01/03/2023]
Abstract
INTRODUCTION Chronic myeloid leukemia (CML) is caused by reciprocal translocation in hematopoietic stem cells (HSCs). This translocation forms the BCR-ABL1 oncogene, which alters several signaling pathways that control malignancy. CML has three phases: chronic, accelerated, and blast crisis. The microRNAs (miRNAs or miRs) are noncoding RNAs that downregulate their target gene by targeting 3' UTR of mRNA or through translational inhibition. It has been shown that miRNAs regulate many biological processes, and dysregulation of these regulatory RNAs is involved in disease development, particularly in cancer. The important role of miRNAs as therapeutic agents and biomarkers has been demonstrated in CML patients at different phases of the disease. METHODS Stem-loop reverse transcription polymerase chain reaction was used to characterize differentially expressed miRNAs of leukocytes in the peripheral blood of 50 newly diagnosed CML patients in chronic phase. RESULTS Some onco-miRNAs were found to be downregulated (miR-155 and miR-106), and some tumor suppressor miRs (miR-16-1, miR-15a, miR-101, miR-568) were upregulated. CONCLUSION These results show that very few miRNAs alone would be good candidates for CML diagnosis independently of conflicting results, but together could be an additional tool for CML diagnosis. Moreover, miRNAs might be good candidates for prognosis prediction and CML therapy.
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Affiliation(s)
- P Fallah
- Blood Transfusion Research center, High institute for Research and Education in Transfusion Medicine, Tehran, Iran.,Alborz University of Medical Science, Karaj, Iran
| | - N Amirizadeh
- Blood Transfusion Research center, High institute for Research and Education in Transfusion Medicine, Tehran, Iran
| | - B Poopak
- Medical science branch, Islamic Azad University of Tehran, Tehran, Iran
| | - G Toogeh
- Thrombosis and Homeostasis Research Center, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran
| | - E Arefian
- Department of Microbiology, School of Biology, College of Science, University of Tehran, Tehran, Iran
| | - F Kohram
- Department of Biology, Cell Molecular and Structural Biology Program, Miami University, Oxford, OH, USA
| | - S M A Hosseini Rad
- Department of Molecular Biology and Genetic Engineering, Stem Cell Technology Research Center, Tehran, Iran
| | - M Kohram
- Genomic Medicine Institute, Geisinger Health System, Danville, PA, USA
| | - H Teimori Naghadeh
- Blood Transfusion Research center, High institute for Research and Education in Transfusion Medicine, Tehran, Iran
| | - M Soleimani
- Department of Hematology, Faculty of Medicine, Tarbiat Modares University, Tehran, Iran
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75
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Testa U, Pelosi E. MicroRNAs expressed in hematopoietic stem/progenitor cells are deregulated in acute myeloid leukemias. Leuk Lymphoma 2015; 56:1466-74. [PMID: 25242094 DOI: 10.3109/10428194.2014.955019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
MicroRNAs are key regulators of hematopoiesis, specifically involved in regulating the maintenance of stemness of primitive hematopoietic progenitor cells (HPCs) and the early and late stages of hematopoietic differentiation. Some microRNAs have been found to be expressed in hematopoietic stem cells (HSCs) and primitive HPCs, and play a relevant role in regulation of the early steps of hematopoietic cell differentiation. Notable examples of these microRNAs are given by miR-22, miR-29, miR-125 and miR-126. These HSC/HPC-regulating microRNAs are often deregulated in some subsets of acute myeloid leukemia (AML), with pathogenic, diagnostic and prognostic implications. Therefore, elucidation of the pattern of microRNA expression at the level of the early stages of hematopoietic cell differentiation has essential implications, not only for elucidation of the molecular bases of the early stages of hematopoietic differentiation, but also for a better understanding of the pathogenic mechanisms underlying AML.
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Affiliation(s)
- Ugo Testa
- Department of Hematology, Oncology and Molecular Medicine, Istituto Superiore di Sanità , Rome , Italy
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76
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Garofalo M, Croce CM. Role of microRNAs in maintaining cancer stem cells. Adv Drug Deliv Rev 2015; 81:53-61. [PMID: 25446141 PMCID: PMC4445133 DOI: 10.1016/j.addr.2014.11.014] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 11/07/2014] [Accepted: 11/11/2014] [Indexed: 12/14/2022]
Abstract
Increasing evidence sustains that the establishment and maintenance of many, if not all, human cancers are due to cancer stem cells (CSCs), tumor cells with stem cell properties, such as the capacity to self-renew or generate progenitor and differentiated cells. CSCs seem to play a major role in tumor metastasis and drug resistance, but albeit the potential clinical importance, their regulation at the molecular level is not clear. Recent studies have highlighted several miRNAs to be differentially expressed in normal and cancer stem cells and established their role in targeting genes and pathways supporting cancer stemness properties. This review focuses on the last advances on the role of microRNAs in the regulation of stem cell properties and cancer stem cells in different tumors.
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Affiliation(s)
- Michela Garofalo
- Department of Molecular Virology, Immunology and Medical Genetics, Comprehensive Cancer Center, Ohio State University, Columbus, OH, USA; Transcriptional Networks in Lung Cancer Group, Cancer Research UK Manchester Institute, University of Manchester, Wilmslow Road, Manchester M20 4BX, UK.
| | - Carlo M Croce
- Department of Molecular Virology, Immunology and Medical Genetics, Comprehensive Cancer Center, Ohio State University, Columbus, OH, USA.
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Prediction and identification of HLA-A*0201-restricted epitopes from leukemia-associated protein MLAA-22 which elicit cytotoxic T lymphocytes. Med Oncol 2014; 31:293. [PMID: 25355639 DOI: 10.1007/s12032-014-0293-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Accepted: 10/13/2014] [Indexed: 10/24/2022]
Abstract
Cytotoxic T lymphocytes (CTLs) play a critical role in the control of leukemia. However, few effective CTL epitopes have been identified to date yet. We previously reported that MLAA-22, a protein composed of 631 amino acid residues, is a novel acute myeloid leukemia (AML)-associated antigen. In the present study, ten high-score 9-mer peptides, which were selected from MLAA-22 by using ProPred1 and SYFPEITHI bioinformatics tools, were screened to identify HLA-A*0201-restricted-specific CTL epitopes. Monocyte-derived dendritic cells were generated in vitro to be used as antigen-presenting cells for the induction of CTLs. We found that peptide MLAA-22(379-387) (LLPNAIYKV) exhibited the highest binding affinity to HLA-A*0201 among all peptide candidates in the peptide-T2 binding assay. The percentage of positive T2 cells treated with MLAA-22(379-387) was about 96.3%, which is even higher than that of the positive control peptide CML28(173-181) (95.1%). MLAA-22(379-387)-induced CTLs showed the most significant cytotoxic activity and apparent killing effects on the cell lines including THP-1 (human acute monocytic leukemia), A549, T2, U937, and MCF-7, and the specific lysis ratios were 83.8, 32.6, 64.4, 64.4, and 32.6%, respectively, when the effector to target ratio (E/T) was 20:1. Specific lysis (%) of MLAA1 was significantly increased (P < 0.05, P < 0.001, respectively) in THP-1 cell than those in other cancer cell lines and were 28.5, 67.8, and 83.8% at ratio 5:1, 10:1, and 20:1, respectively. Hence, MLAA-22(379-387) is a potential tumor-associated antigen target for AML immunotherapy.
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Wouters R, Cucchi D, Kaspers GJL, Schuurhuis GJ, Cloos J. Relevance of leukemic stem cells in acute myeloid leukemia: heterogeneity and influence on disease monitoring, prognosis and treatment design. Expert Rev Hematol 2014; 7:791-805. [PMID: 25242511 DOI: 10.1586/17474086.2014.959921] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Acute myeloid leukemia is a bone marrow disease characterized by a block in differentiation of the myeloid lineage with a concomitant uncontrolled high proliferation rate. Development of acute myeloid leukemia from stem cells with specific founder mutations, leads to an oligoclonal disease that progresses into a very heterogeneous leukemia at diagnosis. Measurement of leukemic stem cell load and characterization of these cells are essential for prediction of relapse and target identification, respectively. Prediction of relapse by monitoring the disease during minimal residual disease detection is challenged by clonal shifts during therapy. To overcome this, characterization of the potential relapse-initiating cells is required using both flow cytometry and molecular analysis since leukemic stem cells can be targeted both on extracellular features and on stem-cell specific signal transduction pathways.
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Affiliation(s)
- Rolf Wouters
- Departments of Pediatric Oncology/Hematology and Hematology, VU University Medical Center, Amsterdam, The Netherlands
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Shukla S, Meeran SM. Epigenetics of cancer stem cells: Pathways and therapeutics. Biochim Biophys Acta Gen Subj 2014; 1840:3494-3502. [PMID: 25240776 DOI: 10.1016/j.bbagen.2014.09.017] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 09/10/2014] [Accepted: 09/11/2014] [Indexed: 12/30/2022]
Abstract
BACKGROUND Epigenetic alterations including DNA methylation and histone modifications are the key factors in the differentiation of stem cells into different tissue subtypes. The generation of cancer stem cells (CSCs) in the process of carcinogenesis may also involve similar kind of epigenetic reprogramming where, in contrast, it leads to the loss of expression of genes specific to the differentiated state and regaining of stem cell-specific characteristics. The most important predicament with treatment of cancers includes the non-responsive quiescent CSC. SCOPE OF REVIEW The distinctive capabilities of the CSCs make cancer treatment even more difficult as this population of cells tends to remain quiescent for longer intervals and then gets reactivated leading to tumor relapse. Therefore, the current review is aimed to focus on recent advances in understanding the relation of epigenetic reprogramming to the generation, self-renewal and proliferation of CSCs. MAJOR CONCLUSION CSC-targeted therapeutic approaches would improve the chances of patient survival by reducing the frequency of tumor relapse. Differentiation therapy is an emerging therapeutic approach in which the CSCs are induced to differentiate from their quiescent state to a mature differentiated form, through activation of differentiation-related signalling pathways, miRNA-mediated alteration and epigenetic differentiation therapy. Thus, understanding the origin of CSC and their epigenetic regulation is crucial to develop treatment strategy against not only for the heterogeneous population of cancer cells but also to CSCs. GENERAL SIGNIFICANCE Characterizing the epigenetic marks of CSCs and the associated signalling cascades might help in developing therapeutic strategies against chemo-resistant cancers.
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Affiliation(s)
- Samriddhi Shukla
- Laboratory of Cancer Epigenetics, Division of Endocrinology, CSIR-Central Drug Research Institute, Lucknow, India
| | - Syed Musthapa Meeran
- Laboratory of Cancer Epigenetics, Division of Endocrinology, CSIR-Central Drug Research Institute, Lucknow, India.
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