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Abstract
PURPOSE OF REVIEW Normal hematopoietic stem cells (HSCs) and leukemic stem cells (LSCs) interact with the stem cell niche bone marrow in different ways. Understanding the potentially unique microenvironmental regulation of LSCs is key to understanding in-vivo leukemogenic mechanisms and developing novel antileukemic therapies. RECENT FINDINGS When leukemic cells are engrafted in the stem cell niche, the cellular nature of the niche - including mesenchymal stromal cells - is reprogramed. Altered mesenchymal cells selectively support leukemic cells and reinforce the pro-leukemic environment. As the niche plays an active role in leukemogenesis, its remodeling may significantly influence the leukemogenic pattern, and cause differences in clinical prognosis. Notably, niche cells could be stimulated to revert to a pronormal/antileukemic state, creating potential for niche-based antileukemic therapy. SUMMARY Bone marrow microenvironments are under dynamic regulation for normal and leukemic cells, and there is bi-directional control of leukemic cells in the niche. Leukemic cells are both protected by stroma and able to reprogram stromal cells to transform the niche to a state, which reinforces leukemogenesis. Because of its dynamic nature, the niche could be converted to an environment with antileukemic properties, making it an attractive target for therapy.
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Ryk modulates the niche activity of mesenchymal stromal cells by fine-tuning canonical Wnt signaling. Exp Mol Med 2020; 52:1140-1151. [PMID: 32724069 PMCID: PMC8080773 DOI: 10.1038/s12276-020-0477-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 04/02/2020] [Accepted: 04/02/2020] [Indexed: 12/12/2022] Open
Abstract
The importance of modulating the intensity of Wnt signaling has been highlighted in various biological models, but their mechanisms remain unclear. In this study, we found that Ryk—an atypical Wnt receptor with a pseudokinase domain—has a Wnt-modulating effect in bone marrow stromal cells to control hematopoiesis-supporting activities. We first found that Ryk is predominantly expressed in the mesenchymal stromal cells (MSCs) of the bone marrow (BM) compared with hematopoietic cells. Downregulation of Ryk in MSCs decreased their clonogenic activity and ability to support self-renewing expansion of primitive hematopoietic progenitors (HPCs) in response to canonical Wnt ligands. In contrast, under high concentrations of Wnt, Ryk exerted suppressive effects on the transactivation of target genes and HPC-supporting effects in MSCs, thus fine-tuning the signaling intensity of Wnt in BM stromal cells. This ability of Ryk to modulate the HPC-supporting niche activity of MSCs was abrogated by induction of deletion mutants of Ryk lacking the intracellular domain or extracellular domain, indicating that the pseudokinase-containing intracellular domain mediates the Wnt-modulating effects in response to extracellular Wnt ligands. These findings indicate that the ability of the BM microenvironment to respond to extracellular signals and support hematopoiesis may be fine-tuned by Ryk via modulation of Wnt signaling intensity to coordinate hematopoietic activity. Steady production of immune and blood cells depends on a signaling protein that helps maintain stable stem cell populations within the bone marrow. Hematopoietic stem cells (HSCs), which give rise to blood cells, reside within a supportive “niche” surrounded by mesenchymal stromal cells (MSCs), with extensive communication between the two populations. Researchers led by Il-Hoan Oh at The Catholic University of Korea, Seoul, have now identified a mechanism that MSCs employ to stabilize the niche environment through fine-tuning the signaling intensity of Wnt. Oh and colleagues focused on a signaling pathway that controls the undifferentiated state of HSCs, and showed that these signals are specifically modulated by an MSC protein known as Ryk. Without Ryk, MSCs can no longer promote HSC proliferation. However, when these signals are excessively strong, Ryk helps suppress proliferation to keep HSC numbers under control.
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Zhang Y, Shen B, Guan X, Qin M, Ren Z, Ma Y, Dai W, Ding X, Jiang Y. Safety and efficacy of ex vivo expanded CD34 + stem cells in murine and primate models. Stem Cell Res Ther 2019; 10:173. [PMID: 31196160 PMCID: PMC6567473 DOI: 10.1186/s13287-019-1275-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 04/25/2019] [Accepted: 05/22/2019] [Indexed: 11/29/2022] Open
Abstract
Background Hematopoietic stem cell (HSC) transplantation has been widely applied to the treatment of malignant blood diseases. However, limited number of functional HSCs hinders successful transplantation. The purpose of our current study is to develop a new and cost-efficient medium formulation that could greatly enhance the expansion of HSCs while retaining their long-term repopulation and hematopoietic properties for effective clinical transplantation. Methods Enriched human CD34+ cells and mobilized nonhuman primate peripheral blood CD34+ cells were expanded with a new, cost-efficient expansion medium formulation, named hematopoietic expansion medium (HEM), consisting of various cytokines and nutritional supplements. The long-term repopulation potential and hematologic-lineage differentiation ability of expanded human cells were studied in the non-obese diabetic/severe combined immunodeficiency mouse model. Furthermore, the efficacy and safety studies were performed by autologous transplantation of expanded primate cells in the nonhuman primate model. Results HEM could effectively expand human CD34+ cells by up to 129 fold within 9 days. Expanded HSCs retained long-term repopulation potential and hematologic-lineage differentiation ability, as indicated by (1) maintenance (over unexpanded HSCs) of immunophenotypes of CD38−CD90+CD45RA−CD49f+ in CD34+ cells after expansion; (2) significant presence of multiple human hematopoietic lineages in mouse peripheral blood and bone marrow following primary transplantation; (3) enrichment (over unexpanded HSCs) in SCID-repopulating cell frequency measured by limiting dilution analysis; and (4) preservation of both myeloid and lymphoid potential among human leukocytes from mouse bone marrow in week 24 after primary transplantation or secondary transplantation. Moreover, the results of autologous transplantation in nonhuman primates demonstrated that HEM-expanded CD34+ cells could enhance hematological recovery after myelo-suppression. All primates transplanted with the expanded autologous CD34+ cells survived for over 18 months without any noticeable abnormalities. Conclusions Together, these findings demonstrate promising potential for the utility of HEM to improve expansion of HSCs for clinical application. Electronic supplementary material The online version of this article (10.1186/s13287-019-1275-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yu Zhang
- Biopharmaceutical R&D Center, Chinese Academy of Medical Sciences & Peking Union Medical College, Suzhou, 215126, China
| | - Bin Shen
- Biopharmaceutical R&D Center, Chinese Academy of Medical Sciences & Peking Union Medical College, Suzhou, 215126, China
| | - Xin Guan
- Biopharmaceutical R&D Center, Chinese Academy of Medical Sciences & Peking Union Medical College, Suzhou, 215126, China.,Biopharmagen Corp, Suzhou, 215126, China
| | - Meng Qin
- Biopharmaceutical R&D Center, Chinese Academy of Medical Sciences & Peking Union Medical College, Suzhou, 215126, China.,Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Zhihua Ren
- Biopharmaceutical R&D Center, Chinese Academy of Medical Sciences & Peking Union Medical College, Suzhou, 215126, China.,Biopharmagen Corp, Suzhou, 215126, China
| | - Yupo Ma
- Biopharmaceutical R&D Center, Chinese Academy of Medical Sciences & Peking Union Medical College, Suzhou, 215126, China.,Department of Pathology, BST-9C, The State University of New York at Stony Brook, Stony Brook, NY, 11794, USA
| | - Wei Dai
- Biopharmaceutical R&D Center, Chinese Academy of Medical Sciences & Peking Union Medical College, Suzhou, 215126, China.,Department of Environmental Medicine, NYU Langone Medical Center, Tuxedo, NY, 10987, USA
| | - Xinxin Ding
- Biopharmaceutical R&D Center, Chinese Academy of Medical Sciences & Peking Union Medical College, Suzhou, 215126, China. .,Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ, 85721, USA.
| | - Yongping Jiang
- Biopharmaceutical R&D Center, Chinese Academy of Medical Sciences & Peking Union Medical College, Suzhou, 215126, China. .,Biopharmagen Corp, Suzhou, 215126, China.
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Lee GY, Jeong SY, Lee HR, Oh IH. Age-related differences in the bone marrow stem cell niche generate specialized microenvironments for the distinct regulation of normal hematopoietic and leukemia stem cells. Sci Rep 2019; 9:1007. [PMID: 30700727 PMCID: PMC6353913 DOI: 10.1038/s41598-018-36999-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 11/20/2018] [Indexed: 02/06/2023] Open
Abstract
The bone marrow (BM) microenvironment serves as a stem cell niche regulating the in vivo cell fate of normal hematopoietic stem cells (HSC) as well as leukemia stem cells (LSCs). Accumulating studies have indicated that the regeneration of normal HSCs and the process of leukemogenesis change with advancing age. However, the role of microenvironmental factors in these age-related effects are unclear. Here, we compared the stem cell niche in neonatal and adult BM to investigate potential differences in their microenvironmental regulation of both normal and leukemic stem cells. We found that the mesenchymal niche in neonatal BM, compared to adult BM, was characterized by a higher frequency of primitive subsets of mesenchymal stroma expressing both platelet-derived growth factor receptor and Sca-1, and higher expression levels of the niche cross-talk molecules, Jagged-1 and CXCL-12. Accordingly, normal HSCs transplanted into neonatal mice exhibited higher levels of regeneration in BM, with no difference in homing efficiency or splenic engraftment compared to adult BM. In contrast, in vivo self-renewal of LSCs was higher in adult BM than in neonatal BM, with increased frequencies of leukemia-initiating cells as well as higher lympho-myeloid differentiation potential towards biphenotypic leukemic cells. These differences in LSC self-renewal capacity between neonates and adults was abrogated by switching of recipients, confirming their microenvironmental origin. Our study provides insight into the differences in leukemic diseases observed in childhood and adults, and is important for interpretation of many transplantation studies involving neonatal animal models.
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Affiliation(s)
- Ga-Young Lee
- Catholic High-Performance Cell Therapy Center and Department of Medical Lifescience, The Catholic University of Korea, College of Medicine, Seoul, 137-701, Korea
| | - Seon-Yeong Jeong
- Catholic High-Performance Cell Therapy Center and Department of Medical Lifescience, The Catholic University of Korea, College of Medicine, Seoul, 137-701, Korea
| | - Hae-Ri Lee
- Catholic High-Performance Cell Therapy Center and Department of Medical Lifescience, The Catholic University of Korea, College of Medicine, Seoul, 137-701, Korea
| | - Il-Hoan Oh
- Catholic High-Performance Cell Therapy Center and Department of Medical Lifescience, The Catholic University of Korea, College of Medicine, Seoul, 137-701, Korea. .,Department of Medical Lifescience, The Catholic University of Korea, College of Medicine, Seoul, 137-701, Korea.
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Jeong SY, Kim JA, Oh IH. The Adaptive Remodeling of Stem Cell Niche in Stimulated Bone Marrow Counteracts the Leukemic Niche. Stem Cells 2018; 36:1617-1629. [PMID: 30004606 DOI: 10.1002/stem.2870] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 05/29/2018] [Accepted: 06/05/2018] [Indexed: 02/06/2023]
Abstract
Accumulating studies have shown the cellular nature of hematopoietic stem cell (HSC) niche in bone marrow (BM) and their degenerative changes under leukemic conditions. However, the dynamic adaptation of niche cells to changes in physiological stimulatory signals remains largely uncharacterized. Here, we have established a niche stimulation model induced by 5-fluorouracil. This model reveals a rapid and reversible conversion of mesenchymal cells into niche-like stromal cells, which exhibit a platelet-derived growth factor receptor-alpha+ /leptin receptor+ (PL) phenotype. These cells selectively induce the niche signaling molecule, Jagged-1, but not CXCL12, to initiate a stimulation-induced regeneration of HSCs in a Jagged-1 dependent manner. Conversion of mesenchymal cells into niche-like cells occurred independently of mitotic activation. The conversion was accompanied by the acquisition of primitive mesenchymal cell characteristics, including the rapid induction of stage specific embryonic antigen-3 and the acquisition of clonogenic potential. The stimulation-induced remodeling of the BM niche resulted in a positive stimulatory effect on the regeneration of normal HSC, but exerted inhibitory effects on leukemic cells, leading to a competitive advantage for normal HSCs in the BM niche and prolonged survival of mice engrafted with leukemic cells. Thus, the reactive conversion of mesenchymal stroma into niche-like cells reveals the adaptive changes of the BM microenvironment to stimuli, and provides insight on the remodeling of niche toward pronormal/antileukemic microenvironment, which can counteract the progressive proleukemic changes driven by the leukemic niche. Our study raises the potential for antileukemic niche targeting therapy. Stem Cells 2018;36:1617-1629.
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Affiliation(s)
- Seon-Yeong Jeong
- Catholic High-Performance Cell Therapy Center and Department of Medical Lifescience, The Catholic University of Korea, College of Medicine, Seoul, South Korea
| | - Jin-A Kim
- Catholic High-Performance Cell Therapy Center and Department of Medical Lifescience, The Catholic University of Korea, College of Medicine, Seoul, South Korea
| | - Il-Hoan Oh
- Catholic High-Performance Cell Therapy Center and Department of Medical Lifescience, The Catholic University of Korea, College of Medicine, Seoul, South Korea.,Department of Medical Lifescience, The Catholic University of Korea, College of Medicine, Seoul, South Korea
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Kim JA, Shim JS, Lee GY, Yim HW, Kim TM, Kim M, Leem SH, Lee JW, Min CK, Oh IH. Microenvironmental remodeling as a parameter and prognostic factor of heterogeneous leukemogenesis in acute myelogenous leukemia. Cancer Res 2015; 75:2222-31. [PMID: 25791383 DOI: 10.1158/0008-5472.can-14-3379] [Citation(s) in RCA: 115] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 02/27/2015] [Indexed: 12/16/2022]
Abstract
Acute myelogenous leukemia (AML) is a heterogeneous disorder characterized by clonal proliferation of stem cell-like blasts in bone marrow (BM); however, their unique cellular interaction within the BM microenvironment and its functional significance remain unclear. Here, we assessed the BM microenvironment of AML patients and demonstrate that the leukemia stem cells induce a change in the transcriptional programming of the normal mesenchymal stromal cells (MSC). The modified leukemic niche alters the expressions of cross-talk molecules (i.e., CXCL12 and JAG1) in MSCs to provide a distinct cross-talk between normal and leukemia cells, selectively suppressing normal primitive hematopoietic cells while supporting leukemogenesis and chemoresistance. Of note, AML patients exhibited distinct heterogeneity in the alteration of mesenchymal stroma in BM. The distinct pattern of stromal changes in leukemic BM at initial diagnosis was associated with a heterogeneous posttreatment clinical course with respect to the maintenance of complete remission for 5 to 8 years and early or late relapse. Thus, remodeling of mesenchymal niche by leukemia cells is an intrinsic self-reinforcing process of leukemogenesis that can be a parameter for the heterogeneity in the clinical course of leukemia and hence serve as a potential prognostic factor.
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Affiliation(s)
- Jin-A Kim
- Catholic High-Performance Cell Therapy Center, The Catholic University of Korea, Seoul, Republic of Korea. Department of Medical Lifescience, The Catholic University of Korea, Seoul, Republic of Korea
| | - Jae-Seung Shim
- Catholic High-Performance Cell Therapy Center, The Catholic University of Korea, Seoul, Republic of Korea. Department of Medical Lifescience, The Catholic University of Korea, Seoul, Republic of Korea
| | - Ga-Young Lee
- Catholic High-Performance Cell Therapy Center, The Catholic University of Korea, Seoul, Republic of Korea. Department of Medical Lifescience, The Catholic University of Korea, Seoul, Republic of Korea
| | - Hyeon Woo Yim
- Department of Preventive Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Tae-Min Kim
- Center for Cancer Evolution, Medical Research Center, The Catholic University of Korea, Seoul, Republic of Korea
| | - Myungshin Kim
- Department of Laboratory Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Sun-Hee Leem
- Department of Biological Science, Dong-A University, Busan, Republic of KoreaSouth Korea
| | - Jong-Wook Lee
- Catholic Stem Cell Transplantation Center, Seoul St. Mary's Hospital, Seoul, Republic of Korea
| | - Chang-Ki Min
- Catholic Stem Cell Transplantation Center, Seoul St. Mary's Hospital, Seoul, Republic of Korea
| | - Il-Hoan Oh
- Catholic High-Performance Cell Therapy Center, The Catholic University of Korea, Seoul, Republic of Korea. Department of Medical Lifescience, The Catholic University of Korea, Seoul, Republic of Korea.
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Exhaustion of nucleus pulposus progenitor cells with ageing and degeneration of the intervertebral disc. Nat Commun 2013; 3:1264. [PMID: 23232394 PMCID: PMC3535337 DOI: 10.1038/ncomms2226] [Citation(s) in RCA: 325] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Accepted: 10/25/2012] [Indexed: 02/07/2023] Open
Abstract
Despite the high prevalence of intervertebral disc disease, little is known about changes in intervertebral disc cells and their regenerative potential with ageing and intervertebral disc degeneration. Here we identify populations of progenitor cells that are Tie2 positive (Tie2+) and disialoganglioside 2 positive (GD2+), in the nucleus pulposus from mice and humans. These cells form spheroid colonies that express type II collagen and aggrecan. They are clonally multipotent and differentiated into mesenchymal lineages and induced reorganization of nucleus pulposus tissue when transplanted into non-obese diabetic/severe combined immunodeficient mice. The frequency of Tie2+ cells in tissues from patients decreases markedly with age and degeneration of the intervertebral disc, suggesting exhaustion of their capacity for regeneration. However, progenitor cells (Tie2+GD2+) can be induced from their precursor cells (Tie2+GD2−) under simple culture conditions. Moreover, angiopoietin-1, a ligand of Tie2, is crucial for the survival of nucleus pulposus cells. Our results offer insights for regenerative therapy and a new diagnostic standard. Back pain and sciatica are often caused by intervertebral disc degeneration. Sakai and colleagues identify a subset of nucleus pulposus progenitor cells from the intervertebral disc and show that loss of these progenitor cells correlates with ageing and intervertebral disc degeneration.
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Increasing hematopoietic stem cell yield to develop mice with human immune systems. BIOMED RESEARCH INTERNATIONAL 2013; 2013:740892. [PMID: 23509770 PMCID: PMC3586441 DOI: 10.1155/2013/740892] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 12/17/2012] [Accepted: 12/27/2012] [Indexed: 01/14/2023]
Abstract
Hematopoietic stem cells (HSCs) are unique in their capacity to give rise to all mature cells of the immune system. For years, HSC transplantation has been used for treatment of genetic and neoplastic diseases of the hematopoietic and immune systems. The sourcing of HSCs from human umbilical cord blood has salient advantages over isolation from mobilized peripheral blood. However, poor sample yield has prompted development of methodologies to expand HSCs ex vivo. Cytokines, trophic factors, and small molecules have been variously used to promote survival and proliferation of HSCs in culture, whilst strategies to lower the concentration of inhibitors in the culture media have recently been applied to promote HSC expansion. In this paper, we outline strategies to expand HSCs in vitro, and to improve engraftment and reconstitution of human immune systems in immunocompromised mice. To the extent that these “humanized” mice are representative of the endogenous human immune system, they will be invaluable tools for both basic science and translational medicine.
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Zhou B, Tsaknakis G, Coldwell KE, Khoo CP, Roubelakis MG, Chang CH, Pepperell E, Watt SM. A novel function for the haemopoietic supportive murine bone marrow MS-5 mesenchymal stromal cell line in promoting human vasculogenesis and angiogenesis. Br J Haematol 2012; 157:299-311. [PMID: 22324374 DOI: 10.1111/j.1365-2141.2012.09050.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2011] [Accepted: 01/05/2012] [Indexed: 12/17/2022]
Abstract
The bone marrow contains specific microenvironmental stem cell niches that maintain haemopoiesis. CXCL12-expressing mesenchymal stromal cells are closely associated with the bone marrow sinusoidal endothelia, forming key elements of the haemopoietic stem cell niche, yet their ability to regulate endothelial function is not clearly defined. Given that the murine nestin(+) cell line, MS-5, provides a clonal surrogate bone marrow stromal niche capable of regulating both murine and human primitive haemopoietic stem/progenitor cell (HSC/HPC) fate in vitro, we hypothesized that MS-5 cells might also support new blood vessel formation and function. Here, for the first time, we demonstrate that this is indeed the case. Using proteome arrays, we identified HSC/HPC active angiogenic factors that are preferentially secreted by haemopoietic supportive nestin(+) MS-5 cells, including CXCL12 (SDF-1), NOV (CCN3), HGF, Angiopoietin-1 and CCL2 (MCP-1). Concentrating on CXCL12, we confirmed its presence in MS-5 conditioned media and demonstrated that its antagonist in receptor binding, AMD-3100, which mobilizes HSC/HPCs and endothelial progenitors from bone marrow, could significantly reduce MS-5 mediated human vasculogenesis in vitro, principally by regulating human endothelial cell migration. Thus, the clonal nestin(+) MS-5 murine bone marrow stromal cell line not only promotes human haemopoiesis but also induces human vasculogenesis, with CXCL12 playing important roles in both processes.
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Affiliation(s)
- Bob Zhou
- Stem Cell Research Laboratory, NHS Blood and Transplant, John Radcliffe Hospital, Headington, Oxford, UK
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Development of a high-resolution purification method for precise functional characterization of primitive human cord blood–derived CD34–negative SCID-repopulating cells. Exp Hematol 2011; 39:203-213.e1. [DOI: 10.1016/j.exphem.2010.11.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2010] [Revised: 11/17/2010] [Accepted: 11/17/2010] [Indexed: 11/21/2022]
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Muguruma Y, Matsushita H, Yahata T, Yumino S, Tanaka Y, Miyachi H, Ogawa Y, Kawada H, Ito M, Ando K. Establishment of a xenograft model of human myelodysplastic syndromes. Haematologica 2010; 96:543-51. [PMID: 21193418 DOI: 10.3324/haematol.2010.027557] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND To understand how myelodysplastic syndrome cells evolve from normal stem cells and gain competitive advantages over normal hematopoiesis, we established a murine xenograft model harboring bone marrow cells from patients with myelodysplastic syndromes or acute myeloid leukemia with myelodysplasia-related changes. DESIGN AND METHODS Bone marrow CD34(+) cells obtained from patients were injected, with or without human mesenchymal stem cells, into the bone marrow of non-obese diabetic/severe combined immunodeficient/IL2Rγ(null) hosts. Engraftment and differentiation of cells derived from the patients were investigated by flow cytometry and immunohistochemical analysis. RESULTS Co-injection of patients' cells and human mesenchymal stem cells led to successful engraftment of patient-derived cells that maintained the immunophenotypes and genomic abnormalities of the original patients. Myelodysplastic syndrome-originated clones differentiated into mature neutrophils, megakaryocytes, and erythroblasts. Two of the samples derived from patients with acute myeloid leukemia with myelodysplasia-related changes were able to sustain neoplastic growth into the next generation while these cells had limited differentiation ability in the murine host. The hematopoiesis of mice engrafted with patients' cells was significantly suppressed even when human cells accounted for less than 1% of total marrow mononuclear cells. Histological studies revealed invasion of the endosteal surface by patient-derived CD34(+) cells and disruption of extracellular matrix architecture, which probably caused inhibition of murine hematopoiesis. CONCLUSIONS We established murine models of human myelodysplastic syndromes using cells obtained from patients: the presence of neoplastic cells was associated with the suppression of normal host hematopoiesis. The efficiency of engraftment was related to the presence of an abnormality in chromosome 7.
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Affiliation(s)
- Yukari Muguruma
- Research Center for Regenerative Medicine, Division of Hematopoiesis, Tokai University School of Medicine, Isehara, Japan
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In vivo dynamics of human cord blood-derived CD34− SCID-repopulating cells using intra-bone marrow injection. Leukemia 2009; 24:162-8. [DOI: 10.1038/leu.2009.206] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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da Silva CL, Gonçalves R, Porada CD, Ascensão JL, Zanjani ED, Cabral JMS, Almeida-Porada G. Differences amid bone marrow and cord blood hematopoietic stem/progenitor cell division kinetics. J Cell Physiol 2009; 220:102-11. [PMID: 19277981 DOI: 10.1002/jcp.21736] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Human hematopoietic stem/progenitor cells (HSC) isolated based upon specific patterns of CD34 and CD38 expression, despite phenotypically identical, were found to be functionally heterogeneous, raising the possibility that reversible expression of these antigens may occur during cellular activation and/or proliferation. In these studies, we combined PKH67 tracking with CD34/CD38 immunostaining to compare cell division kinetics between human bone marrow (BM) and cord blood (CB)-derived HSC expanded in a serum-free/stromal-based system for 14 days (d), and correlated CD34 and CD38 expression with the cell divisional history. CB cells began dividing 24 h earlier than BM cells, and significantly higher numbers underwent mitosis during the time in culture. By d10, over 55% of the CB-cells reached the ninth generation, whereas BM-cells were mostly distributed between the fifth and seventh generation. By d14, all CB cells had undergone multiple cell divisions, while 0.7-3.8% of BM CD34(+) cells remained quiescent. Furthermore, the percentage of BM cells expressing CD34 decreased from 60.8 +/- 6.3% to 30.6 +/- 6.7% prior to initiating division, suggesting that downmodulation of this antigen occurred before commencement of proliferation. Moreover, with BM, all primitive CD34(+)CD38(-) cells present at the end of culture arose from proliferating CD34(+)CD38(+) cells that downregulated CD38 expression, while in CB, a CD34(+)CD38(-) population was maintained throughout culture. These studies show that BM and CB cells differ significantly in cell division kinetics and expression of CD34 and CD38, and that the inherent modulation of these antigens during ex vivo expansion may lead to erroneous quantification of the stem cell content of the expanded graft.
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Abstract
PURPOSE OF REVIEW Regulation of the multiple fates of hematopoietic stem cells - including quiescence, self-renewal, differentiation, apoptosis, and mobilization from the niche - requires the cooperative actions of several cytokines and other hormones that bind to receptors on these cells. In this review we discuss recent advances in the identification of novel hematopoietic stem cell supportive cytokines and the mechanisms by which they control hematopoietic stem cell fate decisions. RECENT FINDINGS Several extrinsic factors that stimulate ex-vivo expansion of hematopoietic stem cells were recently identified by a number of experimental approaches, including forward genetic screening and transcriptional profiling of supportive stromal cells. Recent experiments in which multiple cytokine signaling pathways are activated or suppressed in hematopoietic stem cells reveal the complexity of signal transduction and cell-fate choice in hematopoietic stem cells in vivo and in vitro. SUMMARY The study of genetically modified mice and improvements in the in-vitro hematopoietic stem cell culture system will be powerful tools to elucidate the functions of cytokines that regulate hematopoietic stem cell function. These will further reveal the complex nature of the mechanisms by which extrinsic factors regulate signal transduction and cell-fate decisions of hematopoietic stem cells.
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