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Lang Y, Lyu Y, Tan Y, Hu Z. Progress in construction of mouse models to investigate the pathogenesis and immune therapy of human hematological malignancy. Front Immunol 2023; 14:1195194. [PMID: 37646021 PMCID: PMC10461088 DOI: 10.3389/fimmu.2023.1195194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 07/27/2023] [Indexed: 09/01/2023] Open
Abstract
Hematological malignancy is a disease arisen by complicate reasons that seriously endangers human health. The research on its pathogenesis and therapies depends on the usage of animal models. Conventional animal model cannot faithfully mirror some characteristics of human features due to the evolutionary divergence, whereas the mouse models hosting human hematological malignancy are more and more applied in basic as well as translational investigations in recent years. According to the construction methods, they can be divided into different types (e.g. cell-derived xenograft (CDX) and patient-derived xenograft model (PDX) model) that have diverse characteristics and application values. In addition, a variety of strategies have been developed to improve human hematological malignant cell engraftment and differentiation in vivo. Moreover, the humanized mouse model with both functional human immune system and autologous human hematological malignancy provides a unique tool for the evaluation of the efficacy of novel immunotherapeutic drugs/approaches. Herein, we first review the evolution of the mouse model of human hematological malignancy; Then, we analyze the characteristics of different types of models and summarize the ways to improve the models; Finally, the way and value of humanized mouse model of human immune system in the immunotherapy of human hematological malignancy are discussed.
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Affiliation(s)
- Yue Lang
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, China
- Department of Dermatology, The First Hospital, Jilin University, Changchun, China
| | - Yanan Lyu
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, China
| | - Yehui Tan
- Department of Hematology, The First Hospital, Jilin University, Changchun, China
| | - Zheng Hu
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, China
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2
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Gama SM, Varela VA, Ribeiro NM, Bizzarro B, Hernandes C, Aloia TPA, Amano MT, Pereira WO. AKT inhibition interferes with the expression of immune checkpoint proteins and increases NK-induced killing of HL60-AML cells. EINSTEIN-SAO PAULO 2023; 21:eAO0171. [PMID: 37341216 DOI: 10.31744/einstein_journal/2023ao0171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Accepted: 10/03/2022] [Indexed: 06/22/2023] Open
Abstract
OBJECTIVE To determine the role of the AKT pathway in the regulating of natural Killer-induced apoptosis of acute myeloid leukemia cells and to characterize the associated molecular mechanisms. METHODS BALB/c nude mice were injected with HL60 cells to induce a xenogenic model of subcutaneous leukemic tumors. Mice were treated with perifosine, and their spleens were analyzed using biometry, histopathology, and immunohistochemistry. Gene expression analysis in leukemia cells was performed by real-time PCR. Protein analysis of leukemia and natural Killer cells was performed by flow cytometry. AKT inhibition in HL60 cells, followed by co-culture with natural Killer cells was performed to assess cytotoxicity. Apoptosis rate was quantified using flow cytometry. RESULTS Perifosine treatment caused a reduction in leukemic infiltration in the spleens of BALB/c nude mice. In vitro , AKT inhibition reduced HL60 resistance to natural Killer-induced apoptosis. AKT inhibition suppressed the immune checkpoint proteins PD-L1, galectin-9, and CD122 in HL60 cells, but did not change the expression of their co-receptors PD1, Tim3, and CD96 on the natural Killer cell surface. In addition, the death receptors DR4, TNFR1, and FAS were overexpressed by AKT inhibition, thus increasing the susceptibility of HL60 cells to the extrinsic pathway of apoptosis. CONCLUSION The AKT pathway is involved in resistance to natural Killer-induced apoptosis in HL60 cells by regulating the expression of immune suppressor receptors. These findings highlight the importance of AKT in contributing to immune evasion mechanisms in acute myeloid leukemia and suggests the potential of AKT inhibition as an adjunct to immunotherapy.
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Affiliation(s)
- Sofia Mônaco Gama
- Faculdade Israelita de Ciências da Saúde Albert Einstein , Hospital Israelita Albert Einstein , São Paulo , SP , Brazil
| | - Vanessa Araújo Varela
- Faculdade Israelita de Ciências da Saúde Albert Einstein , Hospital Israelita Albert Einstein , São Paulo , SP , Brazil
| | - Natalia Mazini Ribeiro
- Faculdade Israelita de Ciências da Saúde Albert Einstein , Hospital Israelita Albert Einstein , São Paulo , SP , Brazil
| | - Bruna Bizzarro
- Faculdade Israelita de Ciências da Saúde Albert Einstein , Hospital Israelita Albert Einstein , São Paulo , SP , Brazil
| | - Camila Hernandes
- Faculdade Israelita de Ciências da Saúde Albert Einstein , Hospital Israelita Albert Einstein , São Paulo , SP , Brazil
| | - Thiago Pinheiro Arrais Aloia
- Faculdade Israelita de Ciências da Saúde Albert Einstein , Hospital Israelita Albert Einstein , São Paulo , SP , Brazil
| | - Mariane Tami Amano
- Department of Clinical and Experimental Oncology , Escola Paulista de Medicina , Universidade Federal de São Paulo , São Paulo , SP , Brazil
| | - Welbert Oliveira Pereira
- Faculdade Israelita de Ciências da Saúde Albert Einstein , Hospital Israelita Albert Einstein , São Paulo , SP , Brazil
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Liu W, Teodorescu P, Halene S, Ghiaur G. The Coming of Age of Preclinical Models of MDS. Front Oncol 2022; 12:815037. [PMID: 35372085 PMCID: PMC8966105 DOI: 10.3389/fonc.2022.815037] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Accepted: 02/21/2022] [Indexed: 11/13/2022] Open
Abstract
Myelodysplastic syndromes (MDS) are a heterogeneous group of clonal bone-marrow diseases with ineffective hematopoiesis resulting in cytopenias and morphologic dysplasia of hematopoietic cells. MDS carry a wide spectrum of genetic abnormalities, ranging from chromosomal abnormalities such as deletions/additions, to recurrent mutations affecting the spliceosome, epigenetic modifiers, or transcription factors. As opposed to AML, research in MDS has been hindered by the lack of preclinical models that faithfully replicate the complexity of the disease and capture the heterogeneity. The complex molecular landscape of the disease poses a unique challenge when creating transgenic mouse-models. In addition, primary MDS cells are difficult to manipulate ex vivo limiting in vitro studies and resulting in a paucity of cell lines and patient derived xenograft models. In recent years, progress has been made in the development of both transgenic and xenograft murine models advancing our understanding of individual contributors to MDS pathology as well as the complex primary interplay of genetic and microenvironment aberrations. We here present a comprehensive review of these transgenic and xenograft models for MDS and future directions.
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Affiliation(s)
- Wei Liu
- Section of Hematology, Yale Cancer Center and Department of Internal Medicine, School of Medicine, Yale University, New Haven, CT, United States
| | - Patric Teodorescu
- Department of Oncology, The Johns Hopkins Hospital, Johns Hopkins Medicine, Baltimore, MD, United States
| | - Stephanie Halene
- Section of Hematology, Yale Cancer Center and Department of Internal Medicine, School of Medicine, Yale University, New Haven, CT, United States
| | - Gabriel Ghiaur
- Department of Oncology, The Johns Hopkins Hospital, Johns Hopkins Medicine, Baltimore, MD, United States
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4
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The Molecular Subtype of Adult Acute Lymphoblastic Leukemia Samples Determines the Engraftment Site and Proliferation Kinetics in Patient-Derived Xenograft Models. Cells 2022; 11:cells11010150. [PMID: 35011712 PMCID: PMC8750004 DOI: 10.3390/cells11010150] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/30/2021] [Accepted: 12/31/2021] [Indexed: 12/28/2022] Open
Abstract
In acute lymphoblastic leukemia (ALL), conventional cell lines do not recapitulate the clonal diversity and microenvironment. Orthotopic patient-derived xenograft models (PDX) overcome these limitations and mimic the clinical situation, but molecular stability and engraftment patterns have not yet been thoroughly assessed. We herein describe and characterize the PDX generation in NSG mice. In vivo tumor cell proliferation, engraftment and location were monitored by flow cytometry and bioluminescence imaging. Leukemic cells were retransplanted for up to four passages, and comparative analyses of engraftment pattern, cellular morphology and genomic hotspot mutations were conducted. Ninety-four percent of all samples were successfully engrafted, and the xenograft velocity was dependent on the molecular subtype, outcome of the patient and transplantation passage. While BCR::ABL1 blasts were located in the spleen, KMT2A-positive cases had higher frequencies in the bone marrow. Molecular changes appeared in most model systems, with low allele frequency variants lost during primary engraftment. After the initial xenografting, however, the PDX models demonstrated high molecular stability. This protocol for reliable ALL engraftment demonstrates variability in the location and molecular signatures during serial transplantation. Thorough characterization of experimentally used PDX systems is indispensable for the correct analysis and valid data interpretation of preclinical PDX studies.
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Skayneh H, Jishi B, Hleihel R, Hamieh M, Darwiche N, Bazarbachi A, El Sabban M, El Hajj H. A Critical Review of Animal Models Used in Acute Myeloid Leukemia Pathophysiology. Genes (Basel) 2019; 10:E614. [PMID: 31412687 PMCID: PMC6722578 DOI: 10.3390/genes10080614] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 07/30/2019] [Accepted: 08/01/2019] [Indexed: 12/24/2022] Open
Abstract
Acute myeloid leukemia (AML) is one of the most frequent, complex, and heterogeneous hematological malignancies. AML prognosis largely depends on acquired cytogenetic, epigenetic, and molecular abnormalities. Despite the improvement in understanding the biology of AML, survival rates remain quite low. Animal models offer a valuable tool to recapitulate different AML subtypes, and to assess the potential role of novel and known mutations in disease progression. This review provides a comprehensive and critical overview of select available AML animal models. These include the non-mammalian Zebrafish and Drosophila models as well as the mammalian rodent systems, comprising rats and mice. The suitability of each animal model, its contribution to the advancement of knowledge in AML pathophysiology and treatment, as well as its advantages and limitations are discussed. Despite some limitations, animal models represent a powerful approach to assess toxicity, and permit the design of new therapeutic strategies.
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Affiliation(s)
- Hala Skayneh
- Department of Experimental Pathology, Microbiology and Immunology, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon
| | - Batoul Jishi
- Department of Anatomy, Cell Biology and Physiological Sciences, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon
| | - Rita Hleihel
- Department of Internal Medicine, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon
| | - Maguy Hamieh
- Department of Experimental Pathology, Microbiology and Immunology, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon
- Department of Internal Medicine, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon
| | - Nadine Darwiche
- Department of Biochemistry and Molecular Genetics, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon
| | - Ali Bazarbachi
- Department of Anatomy, Cell Biology and Physiological Sciences, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon
- Department of Internal Medicine, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon
| | - Marwan El Sabban
- Department of Anatomy, Cell Biology and Physiological Sciences, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon.
| | - Hiba El Hajj
- Department of Experimental Pathology, Microbiology and Immunology, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon.
- Department of Internal Medicine, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon.
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Culen M, Kosarova Z, Jeziskova I, Folta A, Chovancova J, Loja T, Tom N, Bystry V, Janeckova V, Dvorakova D, Mayer J, Racil Z. The influence of mutational status and biological characteristics of acute myeloid leukemia on xenotransplantation outcomes in NOD SCID gamma mice. J Cancer Res Clin Oncol 2018; 144:1239-1251. [PMID: 29721667 DOI: 10.1007/s00432-018-2652-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 04/24/2018] [Indexed: 10/17/2022]
Abstract
PURPOSE This study aimed at analyzing the association of gene mutations and other acute myeloid leukemia (AML) characteristics with engraftment outcomes in immunodeficient mice and to select the engraftment outcomes that best reflect patient survival. METHODS Mutations in 19 genes as well as leukemia- and patient-related characteristics were analyzed for a group of 47 de novo AML samples with respect to three engraftment outcomes: engraftment ability, engraftment intensity (percentage of hCD45+ cells) and engraftment latency. Leukemia-related characteristics were additionally analyzed in an extended group of 68 samples that included the 47 de novo samples, and additional 21 samples from refractory and relapsed cases. Engraftment outcomes were compared with overall and event-free survival of the patients. RESULTS For the 47 de novo samples, no single mutation influenced engraftment, whereas the NPM1 mut /DNMT3A mut co-mutation was associated with higher engraftment ability. NPM1 mut /FLT3-ITD neg had lower engraftment intensity. Among leukemia-related characteristics, a complex karyotype was associated with higher engraftment intensity. Among patient-related characteristics, higher cytogenetic risk was associated with higher engraftment intensity, and failure to achieve clinical remission was associated with shorter engraftment latency. In the extended group of 68 samples, white blood count was associated with higher engraftment ability, and the presence of a complex karyotype was associated with higher engraftment intensity. Association with patient overall survival was seen only for engraftment intensity. CONCLUSIONS The engraftment of AML was influenced by mutation-interactions and other AML characteristics, rather than by single mutated genes, and engraftment intensity best reflected clinical penetrance of AML.
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Affiliation(s)
- Martin Culen
- Faculty of Medicine, Masaryk University, Brno, 625 00, Czech Republic.,Department of Internal Medicine, Hematology and Oncology, University Hospital Brno, Brno, 625 00, Czech Republic.,Central European Institute of Technology, Masaryk University, Brno, 625 00, Czech Republic
| | - Zdenka Kosarova
- Faculty of Medicine, Masaryk University, Brno, 625 00, Czech Republic
| | - Ivana Jeziskova
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno, Brno, 625 00, Czech Republic
| | - Adam Folta
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno, Brno, 625 00, Czech Republic
| | - Jana Chovancova
- Faculty of Medicine, Masaryk University, Brno, 625 00, Czech Republic.,Department of Internal Medicine, Hematology and Oncology, University Hospital Brno, Brno, 625 00, Czech Republic
| | - Tomas Loja
- Central European Institute of Technology, Masaryk University, Brno, 625 00, Czech Republic
| | - Nikola Tom
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno, Brno, 625 00, Czech Republic.,Central European Institute of Technology, Masaryk University, Brno, 625 00, Czech Republic
| | - Vojtech Bystry
- Central European Institute of Technology, Masaryk University, Brno, 625 00, Czech Republic
| | - Veronika Janeckova
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno, Brno, 625 00, Czech Republic
| | - Dana Dvorakova
- Faculty of Medicine, Masaryk University, Brno, 625 00, Czech Republic.,Department of Internal Medicine, Hematology and Oncology, University Hospital Brno, Brno, 625 00, Czech Republic
| | - Jiri Mayer
- Faculty of Medicine, Masaryk University, Brno, 625 00, Czech Republic.,Department of Internal Medicine, Hematology and Oncology, University Hospital Brno, Brno, 625 00, Czech Republic.,Central European Institute of Technology, Masaryk University, Brno, 625 00, Czech Republic
| | - Zdenek Racil
- Faculty of Medicine, Masaryk University, Brno, 625 00, Czech Republic. .,Department of Internal Medicine, Hematology and Oncology, University Hospital Brno, Brno, 625 00, Czech Republic. .,Central European Institute of Technology, Masaryk University, Brno, 625 00, Czech Republic.
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7
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Her Z, Yong KSM, Paramasivam K, Tan WWS, Chan XY, Tan SY, Liu M, Fan Y, Linn YC, Hui KM, Surana U, Chen Q. An improved pre-clinical patient-derived liquid xenograft mouse model for acute myeloid leukemia. J Hematol Oncol 2017; 10:162. [PMID: 28985760 PMCID: PMC5639594 DOI: 10.1186/s13045-017-0532-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 09/29/2017] [Indexed: 11/10/2022] Open
Abstract
Background Xenotransplantation of patient-derived AML (acute myeloid leukemia) cells in NOD-scid Il2rγnull (NSG) mice is the method of choice for evaluating this human hematologic malignancy. However, existing models constructed using intravenous injection in adult or newborn NSG mice have inferior engraftment efficiency, poor peripheral blood engraftment, or are difficult to construct. Methods Here, we describe an improved AML xenograft model where primary human AML cells were injected into NSG newborn pups intrahepatically. Results Introduction of primary cells from AML patients resulted in high levels of engraftment in peripheral blood, spleen, and bone marrow (BM) of recipient mice. The phenotype of engrafted AML cells remained unaltered during serial transplantation. The mice developed features that are consistent with human AML including spleen enlargement and infiltration of AML cells into multiple organs. Importantly, we demonstrated that although leukemic stem cell activity is enriched and mediated by CD34+CD117+ subpopulation, CD34+CD117− subpopulation can acquire CD34+CD117+ phenotype through de-differentiation. Lastly, we evaluated the therapeutic potential of Sorafenib and Regorafenib in this AML model and found that periphery and spleen AML cells are sensitive to these treatments, whereas BM provides a protective environment to AML. Conclusions Collectively, our improved model is robust, easy-to-construct, and reliable for pre-clinical AML studies. Electronic supplementary material The online version of this article (10.1186/s13045-017-0532-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Zhisheng Her
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Proteos, 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Kylie Su Mei Yong
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Proteos, 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Kathirvel Paramasivam
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Proteos, 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Wilson Wei Sheng Tan
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Proteos, 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Xue Ying Chan
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Proteos, 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Sue Yee Tan
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Proteos, 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Min Liu
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Proteos, 61 Biopolis Drive, Singapore, 138673, Singapore.,Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Yong Fan
- Key Laboratory for Major Obstetric Diseases of Guangdong Province, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150, China
| | - Yeh Ching Linn
- Department of Haematology, Singapore General Hospital, Singapore, Singapore
| | - Kam Man Hui
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Proteos, 61 Biopolis Drive, Singapore, 138673, Singapore.,Division of Cellular and Molecular Research, National Cancer Centre, Singapore, Singapore
| | - Uttam Surana
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Proteos, 61 Biopolis Drive, Singapore, 138673, Singapore. .,Department of Pharmacology, National University of Singapore, Singapore, Singapore. .,Bioprocessing Technology Institute, Agency for Science, Technology and Research, Singapore, Singapore.
| | - Qingfeng Chen
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Proteos, 61 Biopolis Drive, Singapore, 138673, Singapore. .,Key Laboratory for Major Obstetric Diseases of Guangdong Province, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150, China. .,Division of Cellular and Molecular Research, National Cancer Centre, Singapore, Singapore. .,Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
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Xu DD, Zhou PJ, Wang Y, Zhang Y, Zhang R, Zhang L, Chen SH, Fu WY, Ruan BB, Xu HP, Hu CZ, Tian L, Qin JH, Wang S, Wang X, Liu QY, Ren Z, Gu XK, Li YH, Liu Z, Wang YF. miR-150 Suppresses the Proliferation and Tumorigenicity of Leukemia Stem Cells by Targeting the Nanog Signaling Pathway. Front Pharmacol 2016; 7:439. [PMID: 27917123 PMCID: PMC5114241 DOI: 10.3389/fphar.2016.00439] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 11/03/2016] [Indexed: 12/18/2022] Open
Abstract
Proliferation, a key feature of cancer cells, accounts for the majority of cancer-related diseases resulting in mortality. MicroRNAs (miRNAs) plays important post-transcriptional modulation roles by acting on multiple signaling pathways, but the underlying mechanism in proliferation and tumorigenicity is unclear. Here, we identified the role of miR-150 in proliferation and tumorigenicity in leukemia stem cells (LSCs; CD34+CD38- cells). miR-150 expression was significantly down-regulated in LSCs from leukemia cell lines and clinical samples. Functional assays demonstrated that increased miR-150 expression inhibited proliferation and clonal and clonogenic growth, enhanced chemosensitivity, and attenuated tumorigenic activity of LSCs in vitro. Transplantation animal studies revealed that miR-150 overexpression progressively abrogates tumor growth. Immunohistochemistry assays demonstrated that miR-150 overexpression enhanced caspase-3 level and reduced Ki-67 level. Moreover, luciferase reporter assays indicated Nanog is a direct and functional target of miR-150. Nanog silencing using small interfering RNA recapitulated anti-proliferation and tumorigenicity inhibition effects. Furthermore, miR-150 directly down-regulated the expression of other cancer stem cell factors including Notch2 and CTNNB1. These results provide insights into the specific biological behavior of miR-150 in regulating LSC proliferation and tumorigenicity. Targeting this miR-150/Nanog axis would be a helpful therapeutic strategy to treat acute myeloid leukemia.
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Affiliation(s)
- Dan-Dan Xu
- College of Life Science and Technology, Jinan UniversityGuangzhou, China; College of Biology Technolgy, Guangdong Food and Drug Vocational CollegeGuangzhou, China
| | - Peng-Jun Zhou
- College of Life Science and Technology, Jinan University Guangzhou, China
| | - Ying Wang
- College of Life Science and Technology, Jinan UniversityGuangzhou, China; Faculty of Environmental and Biological Engineering, Guangdong University of Petrochemical TechnologyMaoming, China
| | - Yi Zhang
- Section of Otolaryngology, Department of Surgery, Yale School of Medicine, New Haven CT, USA
| | - Rong Zhang
- State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center Guangzhou, China
| | - Li Zhang
- College of Life Science and Technology, Jinan University Guangzhou, China
| | - Su-Hong Chen
- College of Biology Technolgy, Guangdong Food and Drug Vocational College Guangzhou, China
| | - Wu-Yu Fu
- Faculty of Environmental and Biological Engineering, Guangdong University of Petrochemical Technology Maoming, China
| | - Bi-Bo Ruan
- Faculty of Environmental and Biological Engineering, Guangdong University of Petrochemical Technology Maoming, China
| | - Hai-Peng Xu
- College of Life Science and Technology, Jinan University Guangzhou, China
| | - Chao-Zhi Hu
- College of Life Science and Technology, Jinan University Guangzhou, China
| | - Lu Tian
- College of Life Science and Technology, Jinan University Guangzhou, China
| | - Jin-Hong Qin
- College of Life Science and Technology, Jinan University Guangzhou, China
| | - Sheng Wang
- College of Life Science and Technology, Jinan University Guangzhou, China
| | - Xiao Wang
- College of Life Science and Technology, Jinan University Guangzhou, China
| | - Qiu-Ying Liu
- College of Life Science and Technology, Jinan University Guangzhou, China
| | - Zhe Ren
- College of Life Science and Technology, Jinan University Guangzhou, China
| | - Xue-Kui Gu
- The First Affiliated Hospital, Guangzhou Hospital of Traditional Chinese Medicine Guangzhou, China
| | - Yao-He Li
- The First Affiliated Hospital, Guangzhou Hospital of Traditional Chinese Medicine Guangzhou, China
| | - Zhong Liu
- College of Life Science and Technology, Jinan University Guangzhou, China
| | - Yi-Fei Wang
- College of Life Science and Technology, Jinan University Guangzhou, China
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9
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An X, Liu J, Wang N, Wang D, Huang L, Zhang L, Cai J, Wery JP, Zhou D, Zhou J, Li QX. AC220 and AraC cause differential inhibitory dynamics in patient-derived M5-AML with FLT3-ITD and, thus, ultimately distinct therapeutic outcomes. Exp Hematol 2016; 45:36-44.e2. [PMID: 27670587 DOI: 10.1016/j.exphem.2016.09.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 09/06/2016] [Accepted: 09/13/2016] [Indexed: 10/21/2022]
Abstract
Engrafting the bone marrow cells of a patient with M5 acute myeloid leukemia into immunocompromised mice (AM7577) resulted in serially transferrable stable AML and eventual mortality. The disease starts in the bone marrow and then expands to peripheral areas, which is typical of M5 leukemogenesis, where high leukemic burden in blood is coincident with symptoms/mortality. The leukemic cells in the mice had myeloid morphology, phenotypes, and genotypes (including the internal tandem duplication of FMS-like tyrosine kinase receptor 3 gene [FLT3-ITD]) similar to those of the original patient. Autocrine mechanisms of human granulocyte-macrophage colony-stimulating factor/interleukin-3 likely support AM7577 growth in mice. Treatment with FLT3 TKI (AC220) caused complete remission in peripheral blood, spleen, and bone, along with relief of symptoms and extended life, hinting that FLT3-ITD may be a key leukemogenic driver maintaining the disease. Interestingly, withdrawal of AC220 (high dose) did not result in relapse of disease, suggesting cure. These results, however, are in contrast to cytarabine (AraC) induction treatment: First, although AraC significantly suppresses the diseases in blood, and to a lesser degree in bone marrow and spleen, the suppression is temporary and does not prevent eventual onset of disease/death. Second, the withdrawal of AraC always resulted in rapid relapse in peripheral blood and eventually death. Our observation in this patient-derived model may provide useful information for clinical applications of the two drugs.
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Affiliation(s)
- Xiaoyu An
- Crown Bioscience, Inc., Santa Clara, CA, USA
| | - Jinping Liu
- Crown Bioscience, Inc., Santa Clara, CA, USA
| | - Na Wang
- Cancer Biology Research Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Di Wang
- Cancer Biology Research Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Liang Huang
- Cancer Biology Research Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Likun Zhang
- Crown Bioscience, Inc., Santa Clara, CA, USA
| | - Jie Cai
- Crown Bioscience, Inc., Santa Clara, CA, USA
| | | | - Demin Zhou
- State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China
| | - Jianfeng Zhou
- Cancer Biology Research Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Qi-Xiang Li
- Crown Bioscience, Inc., Santa Clara, CA, USA; State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China
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10
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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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11
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Drenberg CD, Buelow DR, Pounds SB, Wang YD, Finkelstein D, Rahija RJ, Shurtleff SA, Rubnitz JE, Inaba H, Gruber TA, Klco JM, Baker SD. Transcriptome profiling of patient derived xenograft models established from pediatric acute myeloid leukemia patients confirm maintenance of FLT3-ITD mutation. Leuk Lymphoma 2016; 58:247-250. [PMID: 27248844 DOI: 10.1080/10428194.2016.1187272] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Christina D Drenberg
- a Division of Pharmaceutics, College of Pharmacy , The Ohio State University , Columbus , OH , USA.,b Comprehensive Cancer Center , The Ohio State University , Columbus , OH , USA
| | - Daelynn R Buelow
- a Division of Pharmaceutics, College of Pharmacy , The Ohio State University , Columbus , OH , USA.,b Comprehensive Cancer Center , The Ohio State University , Columbus , OH , USA
| | - Stanley B Pounds
- c Department of Biostatics , St. Jude Children's Research Hospital , Memphis , TN , USA
| | - Yong-Dong Wang
- d Department of Computational Biology , St. Jude Children's Research Hospital , Memphis , TN , USA
| | - David Finkelstein
- d Department of Computational Biology , St. Jude Children's Research Hospital , Memphis , TN , USA
| | - Richard J Rahija
- e Animal Resource Center , St. Jude Children's Research Hospital , Memphis , TN , USA
| | - Sheila A Shurtleff
- f Department of Pathology , St. Jude Children's Research Hospital , Memphis , TN , USA
| | - Jeffrey E Rubnitz
- f Department of Pathology , St. Jude Children's Research Hospital , Memphis , TN , USA
| | - Hiroto Inaba
- f Department of Pathology , St. Jude Children's Research Hospital , Memphis , TN , USA
| | - Tanja A Gruber
- f Department of Pathology , St. Jude Children's Research Hospital , Memphis , TN , USA
| | - Jeffery M Klco
- g Department of Oncology , St. Jude Children's Research Hospital , Memphis , TN , USA
| | - Sharyn D Baker
- a Division of Pharmaceutics, College of Pharmacy , The Ohio State University , Columbus , OH , USA.,b Comprehensive Cancer Center , The Ohio State University , Columbus , OH , USA
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12
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Vick B, Rothenberg M, Sandhöfer N, Carlet M, Finkenzeller C, Krupka C, Grunert M, Trumpp A, Corbacioglu S, Ebinger M, André MC, Hiddemann W, Schneider S, Subklewe M, Metzeler KH, Spiekermann K, Jeremias I. An advanced preclinical mouse model for acute myeloid leukemia using patients' cells of various genetic subgroups and in vivo bioluminescence imaging. PLoS One 2015; 10:e0120925. [PMID: 25793878 PMCID: PMC4368518 DOI: 10.1371/journal.pone.0120925] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 01/27/2015] [Indexed: 12/21/2022] Open
Abstract
Acute myeloid leukemia (AML) is a clinically and molecularly heterogeneous disease with poor outcome. Adequate model systems are required for preclinical studies to improve understanding of AML biology and to develop novel, rational treatment approaches. Xenografts in immunodeficient mice allow performing functional studies on patient-derived AML cells. We have established an improved model system that integrates serial retransplantation of patient-derived xenograft (PDX) cells in mice, genetic manipulation by lentiviral transduction, and essential quality controls by immunophenotyping and targeted resequencing of driver genes. 17/29 samples showed primary engraftment, 10/17 samples could be retransplanted and some of them allowed virtually indefinite serial transplantation. 5/6 samples were successfully transduced using lentiviruses. Neither serial transplantation nor genetic engineering markedly altered sample characteristics analyzed. Transgene expression was stable in PDX AML cells. Example given, recombinant luciferase enabled bioluminescence in vivo imaging and highly sensitive and reliable disease monitoring; imaging visualized minimal disease at 1 PDX cell in 10000 mouse bone marrow cells and facilitated quantifying leukemia initiating cells. We conclude that serial expansion, genetic engineering and imaging represent valuable tools to improve the individualized xenograft mouse model of AML. Prospectively, these advancements enable repetitive, clinically relevant studies on AML biology and preclinical treatment trials on genetically defined and heterogeneous subgroups.
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Affiliation(s)
- Binje Vick
- Group Apoptosis, Department of Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
- German Cancer Consortium (DKTK), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Maja Rothenberg
- Department of Internal Medicine III, University Hospital Grosshadern, Ludwig-Maximilians-Universität (LMU), Munich, Germany
| | - Nadine Sandhöfer
- German Cancer Consortium (DKTK), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
- Department of Internal Medicine III, University Hospital Grosshadern, Ludwig-Maximilians-Universität (LMU), Munich, Germany
- Clinical Cooperation Group Leukemia, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Michela Carlet
- Group Apoptosis, Department of Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Cornelia Finkenzeller
- Group Apoptosis, Department of Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Christina Krupka
- Department of Internal Medicine III, University Hospital Grosshadern, Ludwig-Maximilians-Universität (LMU), Munich, Germany
- Clinical Cooperation Group Immunotherapy, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Michaela Grunert
- Group Apoptosis, Department of Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Andreas Trumpp
- German Cancer Consortium (DKTK), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
- Division of Stem Cells and Cancer, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Heidelberg Institute for Stem Cell Technology and Experimental Medicine (HI-STEM GmbH), Heidelberg, Germany
| | - Selim Corbacioglu
- Department of Pediatrics, University of Regensburg, Regensburg, Germany
| | - Martin Ebinger
- German Cancer Consortium (DKTK), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
- Department of Pediatric Hematology/Oncology, University Children’s Hospital, Eberhard Karls Universität, Tuebingen, Germany
| | - Maya C. André
- Department of Pediatric Hematology/Oncology, University Children’s Hospital, Eberhard Karls Universität, Tuebingen, Germany
- Department of Pediatric Intensive Care Medicine, University Children's Hospital (UKBB), Basel, Switzerland
| | - Wolfgang Hiddemann
- German Cancer Consortium (DKTK), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
- Department of Internal Medicine III, University Hospital Grosshadern, Ludwig-Maximilians-Universität (LMU), Munich, Germany
- Clinical Cooperation Group Leukemia, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Stephanie Schneider
- Department of Internal Medicine III, University Hospital Grosshadern, Ludwig-Maximilians-Universität (LMU), Munich, Germany
| | - Marion Subklewe
- German Cancer Consortium (DKTK), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
- Department of Internal Medicine III, University Hospital Grosshadern, Ludwig-Maximilians-Universität (LMU), Munich, Germany
- Clinical Cooperation Group Immunotherapy, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Klaus H. Metzeler
- Department of Internal Medicine III, University Hospital Grosshadern, Ludwig-Maximilians-Universität (LMU), Munich, Germany
- Clinical Cooperation Group Leukemia, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Karsten Spiekermann
- German Cancer Consortium (DKTK), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
- Department of Internal Medicine III, University Hospital Grosshadern, Ludwig-Maximilians-Universität (LMU), Munich, Germany
- Clinical Cooperation Group Leukemia, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Irmela Jeremias
- Group Apoptosis, Department of Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
- German Cancer Consortium (DKTK), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
- Department of Oncology, Dr von Haunersches Kinderspital, Ludwig Maximilians-Universität (LMU), Munich, Germany
- * E-mail:
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Annesley CE, Brown P. The Biology and Targeting of FLT3 in Pediatric Leukemia. Front Oncol 2014; 4:263. [PMID: 25295230 PMCID: PMC4172015 DOI: 10.3389/fonc.2014.00263] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Accepted: 09/08/2014] [Indexed: 12/22/2022] Open
Abstract
Despite remarkable improvement in treatment outcomes in pediatric leukemia over the past several decades, the prognosis for high-risk groups of acute myeloid leukemia (AML) and acute lymphoblastic leukemia (ALL), as well as for relapsed leukemia, remains poor. Intensification of chemotherapy regimens for those at highest risk has improved success rates, but at the cost of significantly increased morbidity and long-term adverse effects. With the success of imatinib in Philadelphia-chromosome-positive leukemia and all-trans retinoic acid in acute promyelocytic leukemia, the quest to find additional molecularly targeted therapies has generated much excitement over recent years. Another such possible target in pediatric acute leukemia is FMS-like tyrosine kinase 3 (FLT3). FLT3 aberrations are among the most frequently identified transforming events in AML, and have significant clinical implications in both high-risk pediatric AML and in certain high-risk groups of pediatric ALL. Therefore, the successful targeting of FLT3 has tremendous potential to improve outcomes in these subsets of patients. This article will give an overview of the molecular function and signaling of the FLT3 receptor, as well as its pathogenic role in leukemia. We review the discovery of targeting FLT3, discuss currently available FLT3 inhibitors in pediatric leukemia and results of clinical trials to date, and finally, consider the future promise and challenges of FLT3 inhibitor therapy.
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Affiliation(s)
- Colleen E. Annesley
- Oncology and Pediatrics, The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Patrick Brown
- Oncology and Pediatrics, The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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14
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Heterogeneity of clonal expansion and maturation-linked mutation acquisition in hematopoietic progenitors in human acute myeloid leukemia. Leukemia 2014; 28:1969-77. [PMID: 24721792 DOI: 10.1038/leu.2014.107] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Revised: 02/21/2014] [Accepted: 03/13/2014] [Indexed: 12/20/2022]
Abstract
Recent technological advances led to an appreciation of the genetic complexity of human acute myeloid leukemia (AML), but underlying progenitor cells remain poorly understood because their rarity precludes direct study. We developed a co-culture method integrating hypoxia, aryl hydrocarbon receptor inhibition and micro-environmental support via human endothelial cells to isolate these cells. X-chromosome inactivation studies of the least mature precursors derived following prolonged culture of CD34(+)/CD33(-) cells revealed polyclonal growth in highly curable AMLs, suggesting that mutations necessary for clonal expansion were acquired in more mature progenitors. Consistently, in core-binding factor (CBF) leukemias with known complementing mutations, immature precursors derived following prolonged culture of CD34(+)/CD33(-) cells harbored neither mutation or the CBF mutation alone, whereas more mature precursors often carried both mutations. These results were in contrast to those with leukemias with poor prognosis that showed clonal dominance in the least mature precursors. These data indicate heterogeneity among progenitors in human AML that may have prognostic and therapeutic implications.
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15
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Shan WL, Ma XL. How to Establish Acute Myeloid Leukemia Xenograft Models Using Immunodeficient Mice. Asian Pac J Cancer Prev 2013; 14:7057-63. [DOI: 10.7314/apjcp.2013.14.12.7057] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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16
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The Impact of FLT3 Mutations on the Development of Acute Myeloid Leukemias. LEUKEMIA RESEARCH AND TREATMENT 2013; 2013:275760. [PMID: 23936658 PMCID: PMC3725705 DOI: 10.1155/2013/275760] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 04/30/2013] [Accepted: 05/14/2013] [Indexed: 11/17/2022]
Abstract
The development of the genetic studies on acute myeloid leukemias (AMLs) has led to the identification of some recurrent genetic abnormalities. Their discovery was of fundamental importance not only for a better understanding of the molecular pathogenesis of AMLs, but also for the identification of new therapeutic targets. In this context, it is essential to identify AML-associated “driver” mutations, which have a causative role in leukemogenesis. Evidences accumulated during the last years indicate that activating internal tandem duplication mutations in FLT3 (FLT3-ITD), detected in about 20% of AMLs, represents driver mutations and valid therapeutic targets in AMLs. Furthermore, the screening of FLT3-ITD mutations has also considerably helped to improve the identification of more accurate prognostic criteria and of the therapeutic selection of patients.
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17
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Establishment of xenotransplantation model of human CN-AML with FLT3-ITD mut /NPM1 − in NOD/SCID mice. ACTA ACUST UNITED AC 2013; 33:329-334. [DOI: 10.1007/s11596-013-1119-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Indexed: 10/26/2022]
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18
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Peled A, Tavor S. Role of CXCR4 in the pathogenesis of acute myeloid leukemia. Theranostics 2013; 3:34-9. [PMID: 23382784 PMCID: PMC3563079 DOI: 10.7150/thno.5150] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2012] [Accepted: 12/10/2012] [Indexed: 02/02/2023] Open
Abstract
The Chemokine receptor CXCR4 and its ligand stromal derived factor-1 (SDF-1/CXCL12) are important players involved in cross-talk between leukemia cells and the bone marrow (BM) microenvironment. CXCR4 expression is associated with poor prognosis in AML patients with and without the mutated FLT3 gene.CXCL12 which is constrictively secreted from the BM stroma and AML cells is critical for the survival and retention of AML cells within the BM. In vitro, CXCR4 antagonists were shown to inhibit the migration of AML cells in response to CXCL12. In addition, such antagonists were shown to inhibit the survival and colony forming potential of AML cells and abrogate the protective effects of stromal cells on chemotherapy-induced apoptosis in AML cells. In vivo, using immune deficient mouse models, CXCR4 antagonists were found to induce the mobilization of AML cells and progenitor cells into the circulation and enhance anti leukemic effects of chemotherapy. The hypothesis that CXCL12/CXCR4 interactions contribute to the resistance of AML cells to signal transduction inhibitor- and chemotherapy-induced apoptosis is currently being tested in a series of Phase I/II studies in humans.
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Affiliation(s)
- Amnon Peled
- Goldyne Savad Institute of Gene Therapy, Hebrew University Hospital, P.O.B 12000, Jerusalem 91120, Israel.
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19
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Chu SH, Heiser D, Li L, Kaplan I, Collector M, Huso D, Sharkis SJ, Civin C, Small D. FLT3-ITD knockin impairs hematopoietic stem cell quiescence/homeostasis, leading to myeloproliferative neoplasm. Cell Stem Cell 2012; 11:346-58. [PMID: 22958930 PMCID: PMC3725984 DOI: 10.1016/j.stem.2012.05.027] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2011] [Revised: 01/30/2012] [Accepted: 05/24/2012] [Indexed: 11/25/2022]
Abstract
Internal tandem duplication (ITD) mutations within the FMS-like tyrosine kinase-3 (FLT3) render the receptor constitutively active driving proliferation and survival in leukemic blasts. Expression of FLT3-ITD from the endogenous promoter in a murine knockin model results in progenitor expansion and a myeloproliferative neoplasm. In this study, we show that this expansion begins with overproliferation within a compartment of normally quiescent long-term hematopoietic stem cells (LT-HSCs), which become rapidly depleted. This depletion is reversible upon treatment with the small molecule inhibitor Sorafenib, which also ablates the disease. Although the normal LT-HSC has been defined as FLT3(-) by flow cytometric detection, we demonstrate that FLT3 is capable of playing a role within this compartment by examining the effects of constitutively activated FLT3-ITD. This indicates an important link between stem cell quiescence/homeostasis and myeloproliferative disease while also giving novel insight into the emergence of FLT3-ITD mutations in the evolution of leukemic transformation.
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Affiliation(s)
- S. Haihua Chu
- Department of Oncology; Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore MD 21231, USA
| | - Diane Heiser
- Department of Oncology; Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore MD 21231, USA
- Center for Stem Cell Biology & Regenerative Medicine, University of Maryland School of Medicine, Baltimore MD 21201, USA
| | - Li Li
- Department of Oncology; Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore MD 21231, USA
| | - Ian Kaplan
- Department of Oncology; Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore MD 21231, USA
- Pediatric Oncology; Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore MD 21231, USA
| | - Michael Collector
- Department of Oncology; Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore MD 21231, USA
| | - David Huso
- Department of Oncology; Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore MD 21231, USA
- Molecular and Comparative Pathobiology; Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore MD 21231, USA
| | - Saul J Sharkis
- Department of Oncology; Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore MD 21231, USA
| | - Curt Civin
- Center for Stem Cell Biology & Regenerative Medicine, University of Maryland School of Medicine, Baltimore MD 21201, USA
| | - Don Small
- Department of Oncology; Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore MD 21231, USA
- Pediatric Oncology; Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore MD 21231, USA
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Establishment of reproducible xenotransplantation model of T cell acute lymphoblastic leukemia in NOD/SCID mice. JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY. MEDICAL SCIENCES = HUA ZHONG KE JI DA XUE XUE BAO. YI XUE YING DE WEN BAN = HUAZHONG KEJI DAXUE XUEBAO. YIXUE YINGDEWEN BAN 2012; 32:511-516. [PMID: 22886962 DOI: 10.1007/s11596-012-0088-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2011] [Indexed: 10/28/2022]
Abstract
T cell acute lymphoblastic leukemia (T-ALL) is an aggressive leukemia. However the poor prognosis and low morbidity restrict further analysis of the disease. Therefore there is an increasing demand to develop animal models for identifying novel therapeutic approaches. In this study, we inoculated the anti-mouse CD122 monoclonal antibody conditioned NOD/SCID mice with the leukemia cells from 9 T-ALL patients and 1 cell line via the tail vein. Four of the 9 patients and the cell line were successfully engrafted. Flow cytometry detected high percentage of human CD45(+) cells in recipient mice. Immunohistochemistry showed infiltration of human CD45(+) cells in different organs. Serial transplantation was also achieved. In vivo drug treatment showed that dexamethasone could extend survival, which was consistent with clinical observation. These results demonstrated that we successfully established 5 xenotransplantation models of T-ALL in anti-mCD122 mAb conditioned NOD/SCID mice, which recapitulated the characteristics of original disease.
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Abstract
Although the identification of cancer stem cells as therapeutic targets is now actively being pursued in many human malignancies, the leukemic stem cells in acute myeloid leukemia (AML) are a paradigm of such a strategy. Heterogeneity of these cells was suggested by clonal analyses indicating the existence of both leukemias resulting from transformed multipotent CD33(-) stem cells as well others arising from, or predominantly involving, committed CD33(+) myeloid precursors. The latter leukemias, which may be associated with an intrinsically better prognosis, offer a particularly attractive target for stem cell-directed therapies. Targeting the CD33 differentiation antigen with gemtuzumab ozogamicin was the first attempt of such an approach. Emerging clinical data indicate that gemtuzumab ozogamicin is efficacious not only for acute promyelocytic leukemia but, in combination with conventional chemotherapy, also for other favorable- and intermediate-risk AMLs, providing the first proof-of-principle evidence for the validity of this strategy. Herein, we review studies on the nature of stem cells in AML, discuss clinical data on the effectiveness of CD33-directed therapy, and consider the mechanistic basis for success and failure in various AML subsets.
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22
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Morisot S, Wayne AS, Bohana-Kashtan O, Kaplan IM, Gocke CD, Hildreth R, Stetler-Stevenson M, Walker RL, Davis S, Meltzer PS, Wheelan SJ, Brown P, Jones RJ, Shultz LD, Civin CI. High frequencies of leukemia stem cells in poor-outcome childhood precursor-B acute lymphoblastic leukemias. Leukemia 2010; 24:1859-66. [PMID: 20739953 PMCID: PMC3035974 DOI: 10.1038/leu.2010.184] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In order to develop a xenograft model to determine the efficacy of new therapies against primary human precursor-B acute lymphoblastic leukemia (ALL) stem cells (LSCs), we used the highly immunodeficient non-obese diabetic (NOD).Cg-Prkdc(scid)IL2rg(tmlWjl)/SzJ (NOD-severe combined immune deficient (scid) IL2rg(-/-)) mouse strain. Intravenous transplantation of 2 of 2 ALL cell lines and 9 of 14 primary ALL cases generated leukemia-like proliferations in recipient mice by 1-7 months after transplant. Leukemias were retransplantable, and the immunophenotypes, gene rearrangements and expression profiles were identical or similar to those of the original primary samples. NOD-scid mice transplanted with the same primary samples developed similar leukemias with only a slightly longer latency than did NOD-scid-IL2Rg(-/-) mice. In this highly sensitive NOD-scid-IL2Rg(-/-)-based assay, 1-100 unsorted primary human ALL cells from five of five tested patients, four of whom eventually experienced leukemia relapse, generated leukemias in recipient mice. This very high frequency of LSCs suggests that a hierarchical LSC model is not valuable for poor-outcome ALL.
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Affiliation(s)
- S Morisot
- Department of Pediatrics, Center for Stem Cell Biology & Regenerative Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
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Tanizaki R, Nomura Y, Miyata Y, Minami Y, Abe A, Hanamura A, Sawa M, Murata M, Kiyoi H, Matsushita T, Naoe T. Irrespective of CD34 expression, lineage-committed cell fraction reconstitutes and re-establishes transformed Philadelphia chromosome-positive leukemia in NOD / SCID / IL-2Rγc−/−mice. Cancer Sci 2010; 101:631-8. [DOI: 10.1111/j.1349-7006.2009.01440.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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Establishment of Leukemia Mouse Model Using Mouse-Derived A20 Leukemic Cells, and Detection of Tumor Cells in Bone Marrow. Lab Anim Res 2010. [DOI: 10.5625/lar.2010.26.4.415] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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25
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Abstract
The unique characteristics of stem cells, specifically pluripotency and self-renewal, are critical for sustaining the lifelong functionality of organs. Stem cells reside in a special microenvironment called the niche. Stem cells interact with the niche via adhesion molecules and exchange molecular signals that maintain the specific features of stem cells. A better understanding of the nature of stem cells and their niches is expected to provide an alternative approach to the treatment of various serious diseases, including cancer, in clinical practice. It has been suggested that tumor tissue contains a type of stem cell referred to as a cancer stem cell. Interestingly, there are a number of molecules that are commonly expressed in normal and cancer stem cells that lead to different phenomena depending on the local conditions. In this review, the hematopoietic system is used as an example to show how stem cells interact with different niches. The regulatory mechanisms of two kinds of bone marrow niche, osteoblastic and vascular, are covered in this review. Furthermore, the involvement of the niche in cancer stem cell regulation, tumor invasion and metastasis, and its response to oxidative stress is described, and novel therapeutic approaches involving the interactions between cancer stem cells and their niches are addressed.
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Affiliation(s)
- Hiroko Iwasaki
- Department of Cell Differentiation, The Sakaguchi Laboratory of Developmental Biology, Keio University School of Medicine, Tokyo, Japan
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Abstract
Primary human AML cells can be isolated and studied in vitro, but many experimental questions can only be addressed using in vivo models. In particular, tractable animal models are needed to test novel therapies. The genetic complexity of human AML poses significant challenges for the generation of reliable animal models. The hematopoietic systems of both zebrafish ( Danio rerio) and Drosophila have been well characterized ( reviewed in [5, 31]) . Both organisms are well suited to forward genetics mutagenesis screens. Although this approach has been useful for identification of mutants with hematopoietic phenotypes ( e.g., cloche), the impact on cancer biology and hematopoietic malignancies in particular has been limited. A zebrafish model of acute lymphoblastic leukemia has been generated [37] and Drosophila models have shed light on the biology of epithelial tumors ( reviewed in [60]). Nonetheless, in vivo modeling of human AML relies most heavily on mice. Most cellular, molecular, and developmental features of the hematopoietic system are well conserved across mammalian species. The availability of the human and mouse genome sequences and the capability of manipulating the mouse genome make mice the most valuable model organism for AML research. Mice have additional practical value because they have a short reproductive cycle and are relatively inexpensive to house.
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Affiliation(s)
- Julie M Fortier
- Washington University School of Medicine, St. Louis, MO, USA
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27
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Mulloy JC, Wunderlich M, Zheng Y, Wei J. Transforming human blood stem and progenitor cells: a new way forward in leukemia modeling. Cell Cycle 2008; 7:3314-9. [PMID: 18948748 DOI: 10.4161/cc.7.21.6951] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
MLL-AF9 (MA9) is a leukemia fusion gene formed upon translocation of the AF9 gene on chromosome 9 and the MLL gene on chromosome 11. MA9 is commonly found in acute myeloid leukemia (AML) and occasionally in acute lymphoid leukemia and is associated with intermediate to poor outcome. The specific signaling pathways downstream of MA9 are still poorly understood. We have recently described a model system whereby we expressed the MA9 fusion gene in human CD34(+) Umbilical Cord Blood (UCB) cells and showed that these cells transformed to acute myeloid or lymphoid leukemia when injected into immunodeficient mice. The Mixed Lineage Leukemia (MLL) oncogenes are unique in this model system in that they promote full transformation of primary human blood cells, while all other leukemia-associated oncogenes tested thus far have induced only partial phenotypes. Here we provide an update on the use of this system for modeling human leukemia and its potential application for therapeutic testing of novel compounds to treat the disease. We focus specifically on the Rho family of small guanosine triphosphatases (GTPases) as potential therapeutic targets, which we have implicated in the pathogenesis of AML associated with MA9 expression.
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Affiliation(s)
- James C Mulloy
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, University of Cincinnati, Cincinnati, Ohio 45229, USA.
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28
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Kennedy JA, Barabé F. Investigating human leukemogenesis: from cell lines to in vivo models of human leukemia. Leukemia 2008; 22:2029-40. [DOI: 10.1038/leu.2008.206] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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29
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Drake AS, Brady MT, Wang XH, Sait SJN, Earp JC, Ghoshal Gupta S, Ferrone S, Wang ES, Wetzler M. Targeting 11q23 positive acute leukemia cells with high molecular weight-melanoma associated antigen-specific monoclonal antibodies. Cancer Immunol Immunother 2008; 58:415-27. [PMID: 18677475 DOI: 10.1007/s00262-008-0567-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2007] [Accepted: 07/18/2008] [Indexed: 10/21/2022]
Abstract
BACKGROUND Acute leukemia with 11q23 aberrations is associated with a poor outcome with therapy. The lack of efficacy of conventional therapy has stimulated interest in developing novel strategies. Recent studies have shown that 11q23-positive acute leukemia cells express the high molecular weight-melanoma associated antigen (HMW-MAA). This tumor antigen represents a useful target to control growth of human melanoma tumors in patients and in severe combined immunodeficient (SCID) mice, utilizing antibody-based immunotherapy. This effect appears to be mediated by inhibition of the HMW-MAA function such as triggering of the focal adhesion kinase/proline-rich tyrosine kinase 2 (Pyk2) pathways. Therefore, in this study we tested whether HMW-MAA-specific monoclonal antibodies (mAb) could inhibit growth of 11q23-positive leukemia cells in SCID mice. METHODS HMW-MAA-specific mAb were tested for their ability to inhibit the in vitro proliferation of an 11q23-positive acute myeloid leukemia (AML) cell line and blasts from four patients with 11q23 aberrations and their in vivo growth in subcutaneous and disseminated xenograft models. RESULTS The HMW-MAA-specific mAb did not affect in vitro proliferation although they down-regulated phosphorylated (P) Pyk2 expression. Furthermore, the mAb enhanced the in vitro anti-proliferative effect of cytarabine. In vivo the mAb inhibited the growth of leukemic cells in a dose-dependent fashion. However, the difference did not reach statistical significance. No effect was detected on P-Pyk2 expression. Furthermore, HMW-MAA-specific mAb in combination with cytarabine did not improve tumor inhibition. Lastly, the combination of two mAb which recognize distinct HMW-MAA determinants had no detectable effect on survival in a disseminated xenograft model. CONCLUSIONS HMW-MAA-specific mAb down-regulated P-Pyk2 expression and enhanced the anti-proliferative effect of cytarabine in vitro, but had no detectable effect on survival or growth of leukemia cells in vivo. Whether the HMW-MAA-specific mAb can be used as carriers of toxins or chemotherapeutic agents against 11q23-acute leukemia remains to be determined.
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Affiliation(s)
- Allison S Drake
- Department of Medicine, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
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30
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Chemotherapy-resistant human AML stem cells home to and engraft within the bone-marrow endosteal region. Nat Biotechnol 2007; 25:1315-21. [PMID: 17952057 DOI: 10.1038/nbt1350] [Citation(s) in RCA: 712] [Impact Index Per Article: 41.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2006] [Accepted: 09/24/2007] [Indexed: 12/16/2022]
Abstract
Acute myelogenous leukemia (AML) is the most common adult leukemia, characterized by the clonal expansion of immature myeloblasts initiating from rare leukemic stem (LS) cells. To understand the functional properties of human LS cells, we developed a primary human AML xenotransplantation model using newborn nonobese diabetic/severe combined immunodeficient/interleukin (NOD/SCID/IL)2r gamma(null) mice carrying a complete null mutation of the cytokine gamma c upon the SCID background. Using this model, we demonstrated that LS cells exclusively recapitulate AML and retain self-renewal capacity in vivo. They home to and engraft within the osteoblast-rich area of the bone marrow, where AML cells are protected from chemotherapy-induced apoptosis. Quiescence of human LS cells may be a mechanism underlying resistance to cell cycle-dependent cytotoxic therapy. Global transcriptional profiling identified LS cell-specific transcripts that are stable through serial transplantation. These results indicate the potential utility of this AML xenograft model in the development of novel therapeutic strategies targeted at LS cells.
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31
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Lee EM, Bachmann PS, Lock RB. Xenograft models for the preclinical evaluation of new therapies in acute leukemia. Leuk Lymphoma 2007; 48:659-68. [PMID: 17454623 DOI: 10.1080/10428190601113584] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Major advances in understanding the pathophysiology of acute leukemia have resulted in a dramatic increase in the availability of novel compounds for clinical trials. However, since the number of new drugs far exceeds the number of clinical trials that can be conducted because of the availability of eligible patients, there is an urgent need to utilize reliable preclinical models for the prioritization of the most promising potential therapies for those clinical trials. The most widely used preclinical models for the acute leukemias are human tumor xenografts established in immune-deficient mice, and genetically engineered mouse strains. This review summarizes the recent developments and considerations in the use of xenograft models of acute lymphoblastic leukemia, acute myeloid leukemia, and acute promyelocytic leukemia for the preclinical testing of new therapies.
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Affiliation(s)
- Erwin M Lee
- Children's Cancer Institute Australia for Medical Research, University of New South Wales, Sydney, Australia
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32
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Lee C, Lin Y, Huang M, Lin C, Liu C, Chow J, Liu HE. Increased cellular glutathione and protection by bone marrow stromal cells account for the resistance of non-acute promylocytic leukemia acute myeloid leukemia cells to arsenic trioxide in vivo. Leuk Lymphoma 2006; 47:521-9. [PMID: 16396776 DOI: 10.1080/10428190500305851] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Arsenic trioxide (ATO) is a novel agent for acute promylocytic leukemia (APL). Studies performed in vitro have demonstrated that ATO also induces cell-cycle arrest and apoptosis in multiple cancers, including non-APL acute myeloid leukemia (AML). To explore the potential use of ATO on non-APL AML, we treated the leukemic cells in vivo using a NOD/SCID animal model. Mice harboring HL-60 or NB-4 leukemia or primary AML-M2 cells were treated daily with 5 mug/g ATO intraperitoneally for a maximum of 6 weeks. Although ATO initially appeared to be effective on HL-60 cells, it failed to decrease the leukemic cells in bone marrow (BM) after the extended treatment (52.2 +/- 10.7% vs. 62.2 +/- 2.6% in the controls; P = 0.51); whereas the same treatment to NB-4 leukemic mice significantly decreased the percentage of leukemic cells in BM. ATO also failed to eradicate the primary AML cells in vivo. The reason for the treatment failure was that HL-60 cells quickly developed resistance in vivo. The drug resistance could be partly attributable to the increase of cellular glutathione as a result of compensatory response to ATO treatment because depletion of glutathione with buthionine sulfoximine reversed the drug resistance in vitro. Meanwhile, BM stromal cells also contributed to the drug resistance. Leukemic cells grown on an adherent layer of MS-5 stromal cells in the presence of ATO were more proliferative and less apoptotic and had increased expression cyclin D1, Bcl-xL and Bcl-2 and decreased expression of p21, likely protecting the leukemic cells from ATO cytotoxicity. Therefore, our study suggests that strategies to inhibit the compensatory increase of glutathione and block the interaction between leukemic cells and BM stromal cells should be employed before applying ATO to non-APL hematologic malignancies.
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Affiliation(s)
- Chincheng Lee
- Department of Pathology, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan
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33
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Parcells BW, Ikeda AK, Simms-Waldrip T, Moore TB, Sakamoto KM. FMS-like tyrosine kinase 3 in normal hematopoiesis and acute myeloid leukemia. Stem Cells 2006; 24:1174-84. [PMID: 16410383 DOI: 10.1634/stemcells.2005-0519] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Ligand-mediated activation of the FMS-like tyrosine kinase 3 (FLT3) receptor is important for normal proliferation of primitive hematopoietic cells. However, activating mutations in FLT3 induce ligand-independent downstream signaling that promotes oncogenesis through pathways involved in proliferation, differentiation, and survival. FLT3 mutations are identified as the most frequent genetic abnormality in acute myeloid leukemia and are also observed in other leukemias. Multiple small-molecule inhibitors are under development to target aberrant FLT3 activity that confers a poor prognosis in patients.
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Affiliation(s)
- Bertrand W Parcells
- Division of Hematology-Oncology, Department of Pediatrics, Mattel Children's Hospital, Jonsson Comprehensive Cancer Center, Los Angeles, CA, USA
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34
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Pearce DJ, Taussig D, Zibara K, Smith LL, Ridler CM, Preudhomme C, Young BD, Rohatiner AZ, Lister TA, Bonnet D. AML engraftment in the NOD/SCID assay reflects the outcome of AML: implications for our understanding of the heterogeneity of AML. Blood 2005; 107:1166-73. [PMID: 16234360 PMCID: PMC1895911 DOI: 10.1182/blood-2005-06-2325] [Citation(s) in RCA: 187] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The nonobese diabetic/severe combined immunodeficient (NOD/SCID) assay is the current model for assessment of human normal and leukemic stem cells. We explored why 51% of 59 acute myeloid leukemia (AML) patients were unable to initiate leukemia in NOD/SCID mice. Increasing the cell dose, using more permissive recipients, and alternative tissue sources did not cause AML engraftment in most previously nonengrafting AML samples. Homing of AML cells to the marrow was the same between engrafters and nonengrafters. FLT3 internal tandem duplication (ITD) and nucleophosmin mutations occurred at a similar frequency in engrafters and nonengrafters. The only variable that was related to engraftment ability was the karyotypically defined risk stratification of individual AML cases. Of interest, follow-up of younger patients with intermediate-risk AML revealed a significant difference in overall survival between NOD/SCID engrafting and nonengrafting AMLs. Hence, the ability of AML to engraft in the NOD/SCID assay seems to be an inherent property of AML cells, independent of homing, conditioning, or cell frequency/source, which is directly related to prognosis. Our results suggest an important difference between leukemic initiating cells between engrafting and nonengrafting AML cases that correlates with treatment response.
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Affiliation(s)
- Daniel J Pearce
- Hematopoietic Stem Cell Laboratory, Cancer Research UK, London Research Institute, London, UK
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35
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Henschler R, Göttig S, Junghahn I, Bug G, Seifried E, Müller AM, Fichtner I. Transplantation of human acute myeloid leukemia (AML) cells in immunodeficient mice reveals altered cell surface phenotypes and expression of human endothelial markers. Leuk Res 2005; 29:1191-9. [PMID: 15941586 DOI: 10.1016/j.leukres.2005.03.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2004] [Revised: 02/15/2005] [Accepted: 03/14/2005] [Indexed: 01/07/2023]
Abstract
To better characterize acute myeloid leukemia (AML) development in non-obese diabetic (NOD)/severe combined immunodeficiency (SCID) mice, we transplanted samples from patients with AML or KG-1 and EOL-1 cell lines. We found 9/12 primary AML samples and both cell lines to engraft within 2-8 weeks, with 5-80% human cells in bone marrow. Compared with freshly isolated AML cells, percentages of human CD33+, CD38+, CD31+ CD13+ or CD15+ subpopulations increased after transplantation, whereas percentages of CD34+ cells decreased. Engrafted mice frequently showed expression of human endothelial cell markers. Thus, transplantation of human AML into NOD/SCID mice reveals expression of hematopoietic and endothelial differentiation markers.
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MESH Headings
- Acute Disease
- Adult
- Aged
- Animals
- Antigens, Surface/metabolism
- Biomarkers, Tumor/metabolism
- Endothelium, Vascular/cytology
- Endothelium, Vascular/embryology
- Endothelium, Vascular/pathology
- Flow Cytometry
- Humans
- Leukemia, Myeloid/classification
- Leukemia, Myeloid/immunology
- Leukemia, Myeloid/pathology
- Mice
- Mice, Inbred NOD
- Mice, SCID
- Middle Aged
- Phenotype
- Reverse Transcriptase Polymerase Chain Reaction
- Transplantation, Heterologous/immunology
- Transplantation, Heterologous/pathology
- Tumor Cells, Cultured
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Affiliation(s)
- Reinhard Henschler
- Institute of Transfusion Medicine and Immune Hematology, German Red Cross Blood Center, Johann Wolfgang Goethe University, Sandhofstrasse 1, D-60528 Frankfurt, Germany.
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36
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McCormack E, Bruserud O, Gjertsen BT. Animal models of acute myelogenous leukaemia - development, application and future perspectives. Leukemia 2005; 19:687-706. [PMID: 15759039 DOI: 10.1038/sj.leu.2403670] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
From the early inception of the transplant models through to contemporary genetic and xenograft models, evolution of murine leukaemic model systems have been critical to our general comprehension and treatment of cancer, and, more specifically, disease states such as acute myelogenous leukaemia (AML). However, even with modern advances in therapeutics and molecular diagnostics, the majority of AML patients die from their disease. Thus, in the absence of definitive in vitro models which precisely recapitulate the in vivo setting of human AMLs and failure of significant numbers of new drugs late in clinical trials, it is essential that murine AML models are developed to exploit more specific, targeted therapeutics. While various model systems are described and discussed in the literature from initial transplant models such as BNML and spontaneous murine leukaemia virus models, to the more definitive genetic and clinically significant NOD/SCID xenograft models, there exists no single compendium which directly assesses, reviews or compares the relevance of these models. Thus, the function of this article is to provide clinicians and experimentalists a chronological, comprehensive appraisal of all AML model systems, critical discussion on the elucidation of their roles in our understanding of AML and consideration to their efficacy in the development of AML chemotherapeutics.
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Affiliation(s)
- E McCormack
- Hematology Section, Institute of Medicine, University of Bergen, Bergen, Norway
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37
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Ishikawa F, Yasukawa M, Lyons B, Yoshida S, Miyamoto T, Yoshimoto G, Watanabe T, Akashi K, Shultz LD, Harada M. Development of functional human blood and immune systems in NOD/SCID/IL2 receptor {gamma} chain(null) mice. Blood 2005; 106:1565-73. [PMID: 15920010 PMCID: PMC1895228 DOI: 10.1182/blood-2005-02-0516] [Citation(s) in RCA: 707] [Impact Index Per Article: 37.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Here we report that a new nonobese diabetic/severe combined immunodeficient (NOD/SCID) mouse line harboring a complete null mutation of the common cytokine receptor gamma chain (NOD/SCID/interleukin 2 receptor [IL2r] gamma(null)) efficiently supports development of functional human hemato-lymphopoiesis. Purified human (h) CD34(+) or hCD34(+)hCD38(-) cord blood (CB) cells were transplanted into NOD/SCID/IL2rgamma(null) newborns via a facial vein. In all recipients injected with 10(5) hCD34(+) or 2 x 10(4) hCD34(+)hCD38(-) CB cells, human hematopoietic cells were reconstituted at approximately 70% of chimerisms. A high percentage of the human hematopoietic cell chimerism persisted for more than 24 weeks after transplantation, and hCD34(+) bone marrow grafts of primary recipients could reconstitute hematopoiesis in secondary NOD/SCID/IL2rgamma(null) recipients, suggesting that this system can support self-renewal of human hematopoietic stem cells. hCD34(+)hCD38(-) CB cells differentiated into mature blood cells, including myelomonocytes, dendritic cells, erythrocytes, platelets, and lymphocytes. Differentiation into each lineage occurred via developmental intermediates such as common lymphoid progenitors and common myeloid progenitors, recapitulating the steady-state human hematopoiesis. B cells underwent normal class switching, and produced antigen-specific immunoglobulins (Igs). T cells displayed the human leukocyte antigen (HLA)-dependent cytotoxic function. Furthermore, human IgA-secreting B cells were found in the intestinal mucosa, suggesting reconstitution of human mucosal immunity. Thus, the NOD/SCID/IL2rgamma(null) newborn system might be an important experimental model to study the human hemato-lymphoid system.
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MESH Headings
- ADP-ribosyl Cyclase/immunology
- ADP-ribosyl Cyclase 1
- Animals
- Antigens, CD/immunology
- Antigens, CD34/immunology
- Bone Marrow Cells/cytology
- Bone Marrow Cells/immunology
- Cord Blood Stem Cell Transplantation
- Disease Models, Animal
- Hematopoietic Stem Cell Transplantation
- Humans
- Immune System/immunology
- Infant, Newborn
- Membrane Glycoproteins
- Mice
- Mice, Inbred NOD
- Mice, Knockout
- Mice, SCID
- Receptors, Interleukin-2/deficiency
- Receptors, Interleukin-2/genetics
- Receptors, Interleukin-2/immunology
- Receptors, Interleukin-2/physiology
- Spleen/cytology
- Spleen/immunology
- Transplantation, Heterologous/immunology
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Affiliation(s)
- Fumihiko Ishikawa
- Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, 44 Binney St, no. 770, Boston, MA 02115, USA
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38
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Levis M, Murphy KM, Pham R, Kim KT, Stine A, Li L, McNiece I, Smith BD, Small D. Internal tandem duplications of the FLT3 gene are present in leukemia stem cells. Blood 2005; 106:673-80. [PMID: 15797998 PMCID: PMC1895185 DOI: 10.1182/blood-2004-05-1902] [Citation(s) in RCA: 102] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Internal tandem duplication mutations of the FLT3 gene (FLT3/ITD mutations) are the most frequent molecular abnormality in acute myeloid leukemia (AML) and are associated with a poor overall survival. While the normal FLT3 receptor is expressed in early hematopoietic progenitor cells, it has not been determined whether FLT3 mutations are present in the leukemic stem cells. In this study, we sorted primary AML samples into stem cell-enriched CD34+/CD38- fractions and then analyzed the sorted and unsorted cells for the FLT3 mutant-wild-type ratio. In each case, the FLT3 mutant-wild-type ratio was not changed by selection of CD34+/CD38- cells, implying that the mutations are present in the leukemic stem cells. We used the stem cell-enriched fraction to engraft nonobese diabetic-severe combined immunodeficient (NOD-SCID) mice and then confirmed that the FLT3/ITD mutation was present in the resultant engrafted marrow. As a final test of the importance of FLT3/ITD signaling in this engraftment model, we used a small molecule FLT3 inhibitor, CEP-701, to inhibit engraftment of FLT3/ITD stem cells. Taken together, these experiments establish that the FLT3/ITD mutations are present in leukemia stem cells, and that FLT3 inhibitors may have activity against these cells.
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MESH Headings
- ADP-ribosyl Cyclase/metabolism
- ADP-ribosyl Cyclase 1
- Adult
- Aged
- Animals
- Antigens, CD/metabolism
- Antigens, CD34/metabolism
- Base Sequence
- Carbazoles/pharmacology
- Cell Separation
- DNA, Neoplasm/genetics
- Enzyme Inhibitors/pharmacology
- Female
- Furans
- Gene Duplication
- Humans
- Indoles/pharmacology
- Leukemia, Myeloid, Acute/enzymology
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/immunology
- Leukemia, Myeloid, Acute/pathology
- Membrane Glycoproteins
- Mice
- Mice, Inbred NOD
- Mice, SCID
- Middle Aged
- Neoplasm Transplantation
- Neoplastic Stem Cells/enzymology
- Neoplastic Stem Cells/immunology
- Neoplastic Stem Cells/pathology
- Neoplastic Stem Cells/transplantation
- Proto-Oncogene Proteins/antagonists & inhibitors
- Proto-Oncogene Proteins/genetics
- Receptor Protein-Tyrosine Kinases/antagonists & inhibitors
- Receptor Protein-Tyrosine Kinases/genetics
- Tandem Repeat Sequences
- Transplantation, Heterologous
- fms-Like Tyrosine Kinase 3
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39
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Piloto O, Levis M, Huso D, Li Y, Li H, Wang MN, Bassi R, Balderes P, Ludwig DL, Witte L, Zhu Z, Hicklin DJ, Small D. Inhibitory Anti-FLT3 Antibodies Are Capable of Mediating Antibody-Dependent Cell-Mediated Cytotoxicity and Reducing Engraftment of Acute Myelogenous Leukemia Blasts in Nonobese Diabetic/Severe Combined Immunodeficient Mice. Cancer Res 2005; 65:1514-22. [PMID: 15735040 DOI: 10.1158/0008-5472.can-04-3081] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Aberrant FLT3 expression and/or mutation plays a significant role in leukemogenesis. This has prompted the development of selective small molecule tyrosine kinase inhibitors against FLT3. However, like most tyrosine kinase inhibitors, those against FLT3 are not completely specific and at the doses required to completely inhibit target, significant toxicities may occur. In addition, tyrosine kinase inhibitors for other kinases have been shown to select for cells that become resistant. To overcome some of these limitations we developed two fully human phage display monoclonal antibodies against FLT3 (IMC-EB10 and IMC-NC7). These antibodies inhibited ligand-mediated activation of wild-type FLT3 and constitutively activated mutant FLT3 and in most cell types affected downstream STAT5, AKT, and mitogen-activated protein kinase activation. In addition to interfering with FLT3 signaling, IMC-EB10 and, to a significantly lesser extent, IMC-NC7 initiated antibody-dependent cell-mediated cytotoxicity on FLT3-expressing cells. When IMC-EB10 was used in vivo to treat nonobese diabetic/severe combined immunodeficient mice given injections of primary FLT3/ITD acute myelogenous leukemia samples or myeloid cell lines with FLT3 expression, it significantly decreased engraftment of leukemic cells and increased survival, respectively. In contrast, IMC-EB10 treatment did not reduce engraftment of normal human CD34+ cord blood cells nor did it show any significant inhibition of normal murine hematopoiesis. Thus, these types of antibodies have the potential to be safe and effective new therapeutic agents for acute myelogenous leukemia and possibly other FLT3-expressing malignancies.
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MESH Headings
- Animals
- Antibodies, Monoclonal/immunology
- Antibodies, Monoclonal/pharmacology
- Antibody-Dependent Cell Cytotoxicity
- Antigens, CD34/biosynthesis
- Antigens, CD34/immunology
- Fetal Blood/cytology
- Fetal Blood/immunology
- Humans
- Leukemia, Myeloid, Acute/enzymology
- Leukemia, Myeloid, Acute/immunology
- Leukemia, Myeloid, Acute/pathology
- Leukemia, Myeloid, Acute/therapy
- Mice
- Mice, Inbred NOD
- Mice, SCID
- Neoplasm Transplantation
- Proto-Oncogene Proteins/antagonists & inhibitors
- Proto-Oncogene Proteins/immunology
- Receptor Protein-Tyrosine Kinases/antagonists & inhibitors
- Receptor Protein-Tyrosine Kinases/immunology
- Signal Transduction/immunology
- fms-Like Tyrosine Kinase 3
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Affiliation(s)
- Obdulio Piloto
- Department of Oncology and Comparative Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
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40
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Monaco G, Belmont JW, Konopleva M, Andreeff M, Tavor S, Petit I, Kollet O, Lapidot T. Correlation between CXCR4 and Homing or Engraftment of Acute Myelogenous Leukemia. Cancer Res 2004; 64:6832 author reply 6832-3. [PMID: 15375005 DOI: 10.1158/0008-5472.can-04-1936] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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41
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Rombouts EJC, Pavic B, Löwenberg B, Ploemacher RE. Relation between CXCR-4 expression, Flt3 mutations, and unfavorable prognosis of adult acute myeloid leukemia. Blood 2004; 104:550-7. [PMID: 15054042 DOI: 10.1182/blood-2004-02-0566] [Citation(s) in RCA: 224] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Recently it was shown that, analogous to normal hematopoietic cells, the level of CXC chemokine receptor 4 (CXCR-4) expression on acute myeloid leukemia (AML) cells correlates with stromal cell derived factor-1 alpha (SDF-1)-induced chemotaxis. As we speculated that an anomalous organ distribution of AML cells could affect cell survival and thus result in an altered fraction surviving chemotherapy, we examined a possible correlation between patient prognosis and CXCR-4 expression in AML patients. We found that patients with a high CXCR-4 expression in the CD34(+) subset had a significantly reduced survival and a higher probability of relapse, resulting in a median relapse-free survival (RFS) of only 8.3 months. CXCR-4 expression was significantly higher in fetal liver tyrosine kinase-3 (Flt3)/internal tandem duplication (ITD) AML than in Flt3/wild-type (wt) AML. Covariate analysis indicated that the prognostic significance of Flt3/ITDs with respect to RFS was no more apparent when analyzed in conjunction with the expression of CXCR-4 in the CD34(+) subset, suggesting that the poor prognosis of Flt3/ITD AML might be subordinate to the increased CXCR-4 expression. Using a granulocyte colony-stimulating factor receptor (G-CSF-R)-expressing 32D cell line, we observed that SDF-1/CXCR-4 interaction is required for the survival of myeloid differentiating cells, and it also induces a block in G-CSF-induced myeloid differentiation. These data suggest that the SDF-1/CXCR-4 axis may influence therapy responsiveness and defines unfavorable prognosis in AML.
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MESH Headings
- Acute Disease
- Adolescent
- Adult
- Aged
- Aged, 80 and over
- Animals
- Antigens, CD34/analysis
- Cell Differentiation
- Chemokine CXCL12
- Chemokines, CXC/metabolism
- Chemokines, CXC/pharmacology
- Chemotaxis/drug effects
- Female
- Gene Expression Regulation, Leukemic
- Humans
- Leukemia, Myeloid/mortality
- Leukemia, Myeloid/physiopathology
- Male
- Mice
- Mice, Inbred NOD
- Mice, SCID
- Middle Aged
- Neoplasm Transplantation
- Phenotype
- Predictive Value of Tests
- Prognosis
- Proto-Oncogene Proteins/genetics
- Receptor Protein-Tyrosine Kinases/genetics
- Receptors, CXCR4/genetics
- Receptors, CXCR4/metabolism
- Recurrence
- fms-Like Tyrosine Kinase 3
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Affiliation(s)
- Elwin J C Rombouts
- Department of Hematology, Room Ee1391, PO Box 1738, 3000 DR Rotterdam, The Netherlands.
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Huang SY, Tien HF, Su FH, Hsu SM. Nonirradiated NOD/SCID-human chimeric animal model for primary human multiple myeloma: a potential in vivo culture system. THE AMERICAN JOURNAL OF PATHOLOGY 2004; 164:747-56. [PMID: 14742278 PMCID: PMC1602249 DOI: 10.1016/s0002-9440(10)63162-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The NOD/SCID human chimeric animal model was generated by implanting of human fetal bones (FBs) into subcutaneous sites of NOD/SCID mice (NOD/SCID-hu(+)), followed by inoculation of primary bone marrow mononuclear cells (BMNCs) obtained from patients with multiple myeloma (MM) into the FBs. The BMNCs from 30 patients with MM were inoculated, and 28 (93%) of them revealed evidence of tumor growth of myeloma cells (MCs) in the NOD/SCID-hu(+) mice. Intriguingly, 17 (61%) of the 28 patients' BMNCs inoculated developed not only myeloma in the bone marrow of the FBs, but also extramedullary macrotumors (EMTs) along the periosteum of the FBs. The tumor cells in these EMTs had plasmacytoid morphology and preserved antigens and cytogenetics similar, if not identical, to those in the parent MCs. Moreover, small tumor blocks from nine EMTs were transplanted into subcutaneous sites of subsequent recipient NOD/SCID mice without human FBs (NOD/SCID-hu(-)), and all but one grew successfully. Two of the EMTs have been maintained in the animal model for more than 12 months. The NOD/SCID-hu(+) chimeric animal model is highly efficient for growth of primary MCs and presents clinical features of human MM. The engrafted MCs can be maintained subsequently in NOD/SCID-hu(-) mice as in vivo culture.
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Affiliation(s)
- Shang-Yi Huang
- Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei, Taiwan
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43
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Monaco G, Konopleva M, Munsell M, Leysath C, Wang RY, Jackson CE, Korbling M, Estey E, Belmont J, Andreeff M. Engraftment of Acute Myeloid Leukemia in NOD/SCID Mice Is Independent of CXCR4 and Predicts Poor Patient Survival. Stem Cells 2004; 22:188-201. [PMID: 14990858 DOI: 10.1634/stemcells.22-2-188] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The aim of this study was to investigate factors influencing the engraftment potential of acute myeloid leukemia (AML) CD34+ cells in nonobese diabetic/severe combined immunodeficiency (NOD/SCID) mice. We examined the relationship between engraftment, CXCR4 expression on CD34+ and CD34+CD38- cells, and patient (Pt) clinical/laboratory characteristics in 44 samples from 11 Pts. Engraftment, evaluated by Southern blot and CD45 flow cytometric analyses, was observed in murine bone marrow of 6 of 11 Pt samples, ranging from 0.1% to 73.9% by Southern blot and from 0.1%-36.8% by flow cytometry. Poor Pt prognosis was inversely correlated with engraftment; the median overall survival was 95.9 weeks for Pts whose cells did not engraft and 26.1 weeks for those whose cells did engraft (p = 0.012, log-rank test). No other clinical/laboratory variable predicted engraftment. No correlation between the level of CXCR4 expression on AML cells and engraftment was observed. Cells with virtually absent CXCR4 expression were able to engraft, and cells from two Pts with high expression levels of CXCR4 did not engraft. Furthermore, anti-CXCR4 antibody failed to block the engraftment of AML cells into NOD/SCID mice. In conclusion, we demonstrated that CXCR4 is not critical for the engraftment of AML CD34+ cells in NOD/SCID mice. The model may, however, reflect the clinical course of the disease.
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Affiliation(s)
- Giuseppe Monaco
- Department of Human Genetics, Baylor College of Medicine, Houston, Texas, USA
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44
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Brown P, Small D. FLT3 Inhibitors. Eur J Cancer 2004; 40:707-21, discussion 722-4. [PMID: 15010072 DOI: 10.1016/j.ejca.2003.08.030] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2003] [Revised: 08/27/2003] [Accepted: 08/27/2003] [Indexed: 01/01/2023]
Abstract
The area of molecularly-targeted cancer therapeutics is generating tremendous interest and excitement. While clinical investigation of these agents has been largely limited to adults, clinical trials for paediatric cancer patients with many of these agents are now underway. This paper reviews the current status of molecularly-targeted therapies for paediatric malignancies, with special attention given to one class of agents, inhibitors of the FLT3 receptor tyrosine kinase. FLT3 is expressed and activated in many human leukemias, including a significant percentage of pediatric AML and infant and childhood ALL, especially in the setting of MLL gene rearrangement. Activating mutations of FLT3 portend a poor prognosis in pediatric AML. Activated FLT3 can be effectively and selectively targeted by small molecule inhibitors, and these agents have shown promise in early phase clinical trials in adults with AML. Limited preclinical data with FLT3 inhibitors in MLL-rearranged ALL have also been reported. Challenges and future directions for the use of FLT3 inhibitors and other targeted agents in paediatric cancer are discussed.
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Affiliation(s)
- P Brown
- Department of Oncology, Sidney Kimmel Cancer Center at Johns Hopkins, Baltimore, MD 21231-1000, USA
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Matsui W, Huff CA, Wang Q, Malehorn MT, Barber J, Tanhehco Y, Smith BD, Civin CI, Jones RJ. Characterization of clonogenic multiple myeloma cells. Blood 2003; 103:2332-6. [PMID: 14630803 PMCID: PMC3311914 DOI: 10.1182/blood-2003-09-3064] [Citation(s) in RCA: 576] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The identity of the cells responsible for the initiation and maintenance of multiple myeloma (MM) remains unclear largely because of the difficulty growing MM cells in vitro and in vivo. MM cell lines and clinical specimens are characterized by malignant plasma cells that express the cell surface antigen syndecan-1 (CD138); however, CD138 expression is limited to terminally differentiated plasma cells during B-cell development. Moreover, circulating B cells that are clonally related to MM plasma cells have been reported in some patients with MM. We found that human MM cell lines contained small (< 5%) subpopulations that lacked CD138 expression and had greater clonogenic potential in vitro than corresponding CD138+ plasma cells. CD138- cells from clinical MM samples were similarly clonogenic both in vitro and in nonobese diabetic/severe combined immunodeficiency (NOD/SCID) mice, whereas CD138+ cells were not. Furthermore, CD138- cells from both cell lines and clinical samples phenotypically resembled postgerminal center B cells, and their clonogenic growth was inhibited by the anti-CD20 monoclonal antibody rituximab. These data suggest that MM "stem cells" are CD138- B cells with the ability to replicate and subsequently differentiate into malignant CD138+ plasma cells.
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Affiliation(s)
- William Matsui
- Sidney Kimmel Comprehensive Cancer Center, John Hopkins University School of Medicine, Bunting-Blaustein Cancer Research Bldg, Rm 245, 1650 Orleans St, Baltimore, MD 21231, USA.
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Abstract
FMS-like tyrosine kinase-3 (FLT3), a receptor tyrosine kinase, is important for the development of the hematopoietic and immune systems. Activating mutations of FLT3 are now recognized as the most common molecular abnormality in acute myeloid leukemia, and FLT3 mutations may play a role in other hematologic malignancies as well. The poor prognosis of patients harboring these mutations renders FLT3 an obvious target of therapy. This review summarizes the data on the molecular biology and clinical impact of FLT3 mutations, as well as the therapeutic potential of several small-molecule FLT3 inhibitors currently in development.
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Affiliation(s)
- M Levis
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
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