1
|
Vašíček J, Shehata M, Schnabl S, Hilgarth M, Hubmann R, Jäger U, Bauer M, Chrenek P. Critical assessment of the efficiency of CD34 and CD133 antibodies for enrichment of rabbit hematopoietic stem cells. Biotechnol Prog 2018; 34:1278-1289. [PMID: 29882300 DOI: 10.1002/btpr.2659] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 03/25/2018] [Indexed: 12/11/2022]
Abstract
Rabbits have many hereditary diseases common to humans and are therefore a valuable model for regenerative disease and hematopoietic stem cell (HSC) therapies. Currently, there is no substantial data on the isolation and/or enrichment of rabbit HSCs. This study was initiated to evaluate the efficiency of the commercially available anti-CD34 and anti-CD133 antibodies for the detection and potential enrichment of rabbit HSCs from peripheral blood. PBMCs from rabbit and human blood were labelled with different clones of anti-human CD34 monoclonal antibodies (AC136, 581, and 8G12) and rabbit polyclonal CD34 antibody (pCD34) and anti-human CD133 monoclonal antibodies (AC133 and 293C3). Flow cytometry showed a higher percentage of rabbit CD34+ cells labelled by AC136 in comparison to the clone 581 and pCD34 (P < 0.01). A higher percentage of rabbit CD133+ cells were also detected by 293C3 compared to the AC133 clone (P < 0.01). Therefore, AC136 clone was used for the indirect immunomagnetic enrichment of rabbit CD34+ cells using magnetic-activated cell sorting (MACS). The enrichment of the rabbit CD34+ cells after sorting was low in comparison to human samples (2.4% vs. 39.6%). PCR analyses confirmed the efficient enrichment of human CD34+ cells and the low expression of CD34 mRNA in rabbit positive fraction. In conclusion, the tested antibodies might be suitable for detection, but not for sorting the rabbit CD34+ HSCs and new specific anti-rabbit CD34 antibodies are needed for efficient enrichment of rabbit HSCs. © 2018 American Institute of Chemical Engineers Biotechnol. Prog., 2018 © 2018 American Institute of Chemical Engineers Biotechnol. Prog., 34:1278-1289, 2018.
Collapse
Affiliation(s)
- Jaromír Vašíček
- NAFC-Research Institute for Animal Production in Nitra, Institute of Farm Animal Genetics and Reproduction, Lužianky, Slovak Republic, Hlohovecká 2, 951 41.,Research Centre AgroBioTech, Slovak University of Agriculture, Tr. A. Hlinku 2, 949 76 Nitra, Slovak Republic.,Faculty of Biotechnology and Food Science, Department of Biochemistry and Biotechnology, Slovak University of Agriculture, Nitra, Tr A. Hlinku 2, 949 76, Slovak Republic
| | - Medhat Shehata
- Dept. of Internal Medicine I, Div. of Haematology and Haemostaseology, Comprehensive Cancer Centre Vienna, Drug and Target Screening Unit DTSU, Medical University of Vienna, Waehringer Guertel 18-20, Vienna, A-1090, Austria
| | - Susanne Schnabl
- Dept. of Internal Medicine I, Div. of Haematology and Haemostaseology, Comprehensive Cancer Centre Vienna, Drug and Target Screening Unit DTSU, Medical University of Vienna, Waehringer Guertel 18-20, Vienna, A-1090, Austria
| | - Martin Hilgarth
- Dept. of Internal Medicine I, Div. of Haematology and Haemostaseology, Comprehensive Cancer Centre Vienna, Drug and Target Screening Unit DTSU, Medical University of Vienna, Waehringer Guertel 18-20, Vienna, A-1090, Austria
| | - Rainer Hubmann
- Dept. of Internal Medicine I, Div. of Haematology and Haemostaseology, Comprehensive Cancer Centre Vienna, Drug and Target Screening Unit DTSU, Medical University of Vienna, Waehringer Guertel 18-20, Vienna, A-1090, Austria
| | - Ulrich Jäger
- Dept. of Internal Medicine I, Div. of Haematology and Haemostaseology, Comprehensive Cancer Centre Vienna, Drug and Target Screening Unit DTSU, Medical University of Vienna, Waehringer Guertel 18-20, Vienna, A-1090, Austria
| | - Miroslav Bauer
- NAFC-Research Institute for Animal Production in Nitra, Institute of Farm Animal Genetics and Reproduction, Lužianky, Slovak Republic, Hlohovecká 2, 951 41.,Faculty of Natural Sciences, Department of Botany and Genetics, Constantine the Philosopher University in Nitra, 949 74 Nitra, mládeže, Slovak Republic, Nábrežie 91
| | - Peter Chrenek
- NAFC-Research Institute for Animal Production in Nitra, Institute of Farm Animal Genetics and Reproduction, Lužianky, Slovak Republic, Hlohovecká 2, 951 41.,Faculty of Biotechnology and Food Science, Department of Biochemistry and Biotechnology, Slovak University of Agriculture, Nitra, Tr A. Hlinku 2, 949 76, Slovak Republic
| |
Collapse
|
2
|
Moskalensky A, Chernyshev A, Yurkin M, Nekrasov V, Polshchitsin A, Parks D, Moore W, Filatenkov A, Maltsev V, Orlova D. Dynamic quantification of antigen molecules with flow cytometry. J Immunol Methods 2015; 427:139-47. [DOI: 10.1016/j.jim.2015.11.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
3
|
Moskalensky AE, Chernyshev AV, Yurkin MA, Nekrasov VM, Polshchitsin AA, Parks DR, Moore WA, Filatenkov A, Maltsev VP, Orlova DY. Dynamic quantification of antigen molecules with flow cytometry. J Immunol Methods 2015; 418:66-74. [PMID: 25687877 DOI: 10.1016/j.jim.2015.02.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 01/29/2015] [Accepted: 02/05/2015] [Indexed: 10/24/2022]
Abstract
Traditional methods for estimating the number of expressed molecules, based on the detection of target antigens bound with fluorescently labeled antibodies, assume that the antigen-antibody reaction reaches equilibrium. A calibration procedure is used to convert the intensity of the fluorescence signal to the number of target molecules. Along with the different limitations of every calibration system, this substantially limits the applicability of the traditional approaches especially in the case of low affinity antibodies. We address this problem here with studies in which we demonstrate a new approach to the antigen molecule quantification problem. Instead of using a static calibration system, we analyzed mean fluorescence values over time by flow cytometry during antibody-antigen binding. Experimental data obtained with an LSRII cytometer were fitted by a diffusion-reaction mathematical model using the Levenberg-Marquardt nonlinear least squares curve-fitting algorithm in order to obtain the number of target antigen molecules per cell. Results were compared with the Quanti-BRITE calibration system. We conclude that, instead of using experiment-specific calibration, the value of the binding rate constant for each particular antibody-antigen reaction can be used to quantify antigen molecules with flow cytometry. The radius of CD8 antibody molecule binding site was found, that allows recalculating the binding rate constant for other conditions (different sizes of reagent molecules, fluorescent label, medium viscosity and temperature). This approach is independent of specially prepared calibration beads, antibody reagents and the specific dye and can be applied to both low and high affinity antibodies, under both saturating and non-saturating binding conditions. The method was demonstrated on a human blood sample dataset investigating CD8α antigen on T cells in stable binding conditions.
Collapse
Affiliation(s)
- A E Moskalensky
- Institute of Chemical Kinetics and Combustion, 3 Institutskaya, 630090 Novosibirsk, Russia; Novosibirsk State University, 2 Pirogova, 630090 Novosibirsk, Russia
| | - A V Chernyshev
- Institute of Chemical Kinetics and Combustion, 3 Institutskaya, 630090 Novosibirsk, Russia; Novosibirsk State University, 2 Pirogova, 630090 Novosibirsk, Russia
| | - M A Yurkin
- Institute of Chemical Kinetics and Combustion, 3 Institutskaya, 630090 Novosibirsk, Russia; Novosibirsk State University, 2 Pirogova, 630090 Novosibirsk, Russia
| | - V M Nekrasov
- Institute of Chemical Kinetics and Combustion, 3 Institutskaya, 630090 Novosibirsk, Russia; Novosibirsk State University, 2 Pirogova, 630090 Novosibirsk, Russia
| | - A A Polshchitsin
- Institute of Chemical Kinetics and Combustion, 3 Institutskaya, 630090 Novosibirsk, Russia; Novosibirsk State University, 2 Pirogova, 630090 Novosibirsk, Russia; JSC "Vector-Best", 630559 Koltsovo, Russia
| | - D R Parks
- Department of Genetics, Stanford University School of Medicine, 279 Campus Drive, 94305 Stanford, CA, USA
| | - W A Moore
- Department of Genetics, Stanford University School of Medicine, 279 Campus Drive, 94305 Stanford, CA, USA
| | - A Filatenkov
- Division of Immunology and Rheumatology, Stanford University School of Medicine, 269 Campus Drive, 94305 Stanford, CA, USA
| | - V P Maltsev
- Institute of Chemical Kinetics and Combustion, 3 Institutskaya, 630090 Novosibirsk, Russia; Novosibirsk State University, 2 Pirogova, 630090 Novosibirsk, Russia; Novosibirsk State Medical University, 52 Krasny Prospect, 630091 Novosibirsk, Russia
| | - D Y Orlova
- Institute of Chemical Kinetics and Combustion, 3 Institutskaya, 630090 Novosibirsk, Russia; Department of Genetics, Stanford University School of Medicine, 279 Campus Drive, 94305 Stanford, CA, USA.
| |
Collapse
|
4
|
Hong KP, Kang SH, Lee KM, Ji GY, Yoon SS, Kim JS, Son BR, Lee DG, Lee OJ, Song HG. Characterization of a Novel Monoclonal Antibody (27H2) Recognizing Human CD34 Class III Epitope. Immune Netw 2010; 10:239-46. [PMID: 21286385 PMCID: PMC3026944 DOI: 10.4110/in.2010.10.6.239] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2010] [Revised: 11/26/2010] [Accepted: 12/06/2010] [Indexed: 12/01/2022] Open
Abstract
BACKGROUND Monoclonal antibodies (mAbs) recognizing Class III epitope of CD34 are essential for flow cytometric diagnosis of leukemia. METHODS 27H2 mAb was developed from a mouse alternatively immunized with human acute leukemia cell lines, KG1 and Molm-1. Using flow cytometric analysis of various leukemic cell lines and peripheral blood, immunohistochemical study of frozen tonsil, we characterized 27H2 mAb. Antigen immunoprecipitated with 27H2 mAb immunobloted with anti-CD34 mAb. A case of bone marrow sample of acute lymphoblastic leukemia (ALL) patient was obtained at CBNU Hospital. For epitope identification enzyme treatment with neuraminidase and O-sialoglycoprotein endopeptidase (OSGE) and blocking assay with known classIII mAb (HPCA-2) were done. RESULTS Only KG1 and Molm-1 revealed positive immunoreactivity. Immunohistochemical staining disclosed strong membranous immunoreactivity on high endothelial venules. Antigen immunoprecipitated by 27H2 mAb showed approximately 100 kDa sized band immunoblotted with anti-CD34 under non-reducing conditions. Epitope recognized by 27H2 mAb disclosed resistancy to both neuraminidase and OSGE treatment and completely blocked with known class III mAb preincubation. CD34 positive leukemic cells in BM of pre B cell ALL patient detected by FITC-conjugated 27H2 and HPCA-2 were identified with similar sensitivity. CONCLUSION A novel murine mAb recognizing class III epitope of human CD34 with high affinity, which is useful for flow cytometric diagnosis of leukemia, was developed.
Collapse
Affiliation(s)
- Kwon Pyo Hong
- Department of Pathology, College of Medicine and Medical Research Institute, Chungbuk National University, Cheongju 361-763, Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Khoury H, Dalal BI, Nevill TJ, Horsman DE, Barnett MJ, Shepherd JD, Toze CL, Conneally EA, Sutherland HJ, Hogge DE, Nantel SH. Acute Myelogenous Leukemia with t(8;21)—Identification of a Specific Immunophenotype. Leuk Lymphoma 2010; 44:1713-8. [PMID: 14692523 DOI: 10.1080/1042819031000116698] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Association between certain surface markers and acute myelogenous leukemia (AML) with t(8;21) has been described. The specificity and the predictive values of these markers have never been assessed. In this study, we aimed, to explore whether a specific pattern could predict for this translocation. Of 405 consecutive AML, 18 (4.4%) had the t(8;21). Patients with this cytogenetic abnormality showed higher frequency of CD34 (P = 0.003), HLA-DR (P = 0.03), Tdt (P = 0.02), CD19 (P < 0.0001), and CD56 (P < 0.0001) and lower CD33 (P = 0.0001). Taken singly, the sensitivity of these markers for AML with t(8;21) ranged between 39 and 100% with CD34+ having the highest and CD33- having the lowest and the positive predictive values (PPV) ranged between 5 and 21% with CD19+ having the highest and HLA-DR+ having the lowest. When combinations of different markers were analyzed by multivariate analysis, the pattern CD34+/HLA-DR+/MPO+ was found to have the highest sensitivity (100%) with a PPV of 14% and the pattern CD34+/CD19+/CD56+ had the highest PPV (100%) with a sensitivity of 67%. We conclude that AML with t(8;21) is better identified by a combination of markers than by a single antigen pattern, the absence of CD34+, HLA-DR+ or MPO+ would preclude and the expression of the pattern CD34+/CD19+/CD56+ is highly predictive and could serve as a screening criteria for the t(8;21).
Collapse
Affiliation(s)
- Haytham Khoury
- Leukemia/BMT Program of British Columbia, Vancouver, Canada.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Liu R, Mitchell DA. Survivin as an immunotherapeutic target for adult and pediatric malignant brain tumors. Cancer Immunol Immunother 2010; 59:183-93. [PMID: 19756596 PMCID: PMC11030045 DOI: 10.1007/s00262-009-0757-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2009] [Accepted: 08/18/2009] [Indexed: 12/22/2022]
Affiliation(s)
- Rebecca Liu
- The Preston Robert Tisch Brain Tumor Center at Duke, Durham, NC, USA.
| | | |
Collapse
|
7
|
Conway EJ, Wen J, Feng Y, Mo A, Huang WT, Keever-Taylor CA, Hari P, Vesole DH, Chang CC. Phenotyping studies of clonotypic B lymphocytes from patients with multiple myeloma by flow cytometry. Arch Pathol Lab Med 2009; 133:1594-9. [PMID: 19792049 DOI: 10.5858/133.10.1594] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/06/2009] [Indexed: 11/06/2022]
Abstract
CONTEXT Clonotypic B lymphocytes, monoclonal B lymphocytes sharing identical, rearranged IGH-CDR3 sequences with the patient's myeloma cells, have been detected in the peripheral blood of patients with multiple myeloma. These cells have been postulated to act as a therapy-resistant tumor reservoir that drives recurrence. OBJECTIVE To characterize clonotypic B lymphocytes for future investigation of their role in myeloma pathogenesis. DESIGN Harvests of cryopreserved peripheral blood stem-cells from 20 myeloma patients were enriched for clonotypic B lymphocytes. Cytoplasmic immunoglobulin light chain and surface immunophenotype were analyzed by flow cytometry. IGH-CDR3 gene-rearrangement pattern was performed to determine clonality. Posttransplant remission rate was compared with the percentage of clonotypic B lymphocytes. RESULTS Clonotypic B lymphocytes expressing CD34(+/-), CD38(+), CD184(+), CD31(+/-), CD50(+/-), CD138(-), CD19(-), CD20(-), and the same immunoglobulin light chain as the patients' known myeloma cells were identified in 12 of 20 patients (60%). Progenitor B lymphocytes expressing similar surface immunophenotype but opposite light chains were identified in the same patients. Polymerase chain reaction for IGH rearrangement showed clonal rearrangement pattern in clonotypic lymphocytes but not in B lymphocytes expressing light chains opposite to myeloma cells. There was no statistically significant correlation between the percentage of clonotypic B lymphocytes and response to autologous transplant. CONCLUSIONS Clonotypic B lymphocytes expressing CD34, but not CD19, were identified in stem cell harvests from patients with myeloma and could represent progenitor cells of neoplastic plasma cells. However, the same or similar immunophenotyping can be detected in both clonotypic B lymphocytes and benign progenitor B cells, suggesting clonality analysis might be needed to determine clonotypic B lymphocytes in patients with myeloma. Further studies are warranted to study the role of clonotypic B lymphocytes in the pathogenesis of myeloma.
Collapse
Affiliation(s)
- E Joseph Conway
- Department of Pathology, The Methodist Hospital and The Methodist Hospital Research Institute, Houston, Texas 77030, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Otto M, Chen X, Martin WJ, Leung W, Knowles J, Holladay M, Houston J, Handgretinger R, Barfield RC. Selection of Stem Cells by Using Antibodies That Target Different CD34 Epitopes Yields Different Patterns of T-Cell Differentiation. Stem Cells 2007; 25:537-42. [PMID: 17023516 DOI: 10.1634/stemcells.2006-0319] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The objective of this study was to compare the patterns of T-cell differentiation from CD34(+) human stem cells selected with different classes of antibody targeting the CD34 molecule. We compared signal-joint T-cell receptor excision circle (sjTREC) production in thymocytes selected with different classes of anti-CD34 antibody. Based on these results, we studied immune reconstitution in nonobese diabetic/severe combined immunodeficient (NOD/SCID) mice using human stem cells selected with the same antibodies that yielded variation in the thymocytes. Human CD34(+) stem cells were immunomagnetically selected using the class II QBEnd antibody (prevalent in clinical graft engineering) and the class III 8G12 antibody (common in diagnostic tests). Engraftment and T-cell reconstitution were examined after transplantation. Thymocytes selected with the 8G12 class III antibody have a higher TREC production than those selected with the QBEnd class II antibody. Of mice transplanted with cells selected using the 8G12 antibody, 50% had sjTREC production, compared with 14% of mice transplanted with cells selected using the clinically common antibody QBEnd. 8G12 thymic progenitors are characterized by higher quality in thymic distribution and higher activity in T-cell differentiation. Using class III antibody targeting the CD34 molecule resulted in increased T-cell reconstitution in the NOD/SCID mouse. Use of a single antibody epitope targeting the CD34 molecule may lead to loss of cells that might provide richer T-cell reconstitution. Use of different or multiple epitopes, targeting of alternate stem cell markers, or use of cell-depletion strategies might prevent this loss.
Collapse
Affiliation(s)
- Mario Otto
- Division of Stem Cell Transplantation, Department of Hematology/Oncology, St. Jude Children's Research Hospital, 332N Lauderdale Street, Memphis, Tennessee 38105-2794, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
9
|
van Lochem EG, van der Velden VHJ, Wind HK, te Marvelde JG, Westerdaal NAC, van Dongen JJM. Immunophenotypic differentiation patterns of normal hematopoiesis in human bone marrow: reference patterns for age-related changes and disease-induced shifts. CYTOMETRY PART B-CLINICAL CYTOMETRY 2005; 60:1-13. [PMID: 15221864 DOI: 10.1002/cyto.b.20008] [Citation(s) in RCA: 193] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND The abundance of monoclonal antibodies (mAb) and the routine use of quadruple stainings in flow cytometry allow stepwise analysis of bone marrow (BM) samples that are suspected for abnormal hematopoiesis. A screening phase that precedes lineage-specific classification phases should be sufficient to assess whether the BM has a normal or abnormal composition, as well as to identify the abnormal differentiation lineage. METHODS For a quick and easy flow cytometric screening of BM samples, we selected six quadruple immunostainings that cover multiple differentiation stages of the B-cell, monocytic, granulocytic, and erythroid lineages: TdT/CD20/CD19/CD10 and CD45/CD34/CD19/CD22 for B cells, CD34/CD117/CD45/CD13.33 for precursor granulocytic and precursor monocytic cells (myelo/monoblasts), CD14/CD33/CD45/CD34 for monocytic cells, CD16/CD13/CD45/CD11b for granulocytic cells, and CD71/CD235a/CD45/CD117 for erythroid cells. RESULTS The six quadruple immunostainings reveal specific staining patterns in normal BM, which allow the recognition of various subpopulations of the respective lineages. These staining patterns can be used as a frame of reference for recognition of normal and abnormal BM development. Examples of normal (age-related) variations in these otherwise stable staining patterns are presented together with several abnormal differentiation patterns. CONCLUSIONS Although alternative immunostainings can be used (e.g., including NK- and T-cell markers), we feel that the selected six stainings represent a comprehensive and easy screening phase for quick identification of shifts in the composition of the studied differentiation lineages, reflecting age-related changes or disease-induced BM abnormalities.
Collapse
Affiliation(s)
- E G van Lochem
- Department of Immunology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands.
| | | | | | | | | | | |
Collapse
|
10
|
Thiede C, Bornhäuser M, Ehninger G. Strategies and clinical implications of chimerism diagnostics after allogeneic hematopoietic stem cell transplantation. Acta Haematol 2004; 112:16-23. [PMID: 15179000 DOI: 10.1159/000077555] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Analysis of donor chimerism has become a routine method for the documentation of engraftment after allogeneic hematopoietic stem cell transplantation (HSCT). In recent years several groups have also focused on the application of this technique for the detection of relapsing disease after allogeneic HSCT. This review addresses technical issues (sensitivity, specificity) and discusses the advantages and limitations of methods currently used for chimerism analysis and their usefulness for the detection of MRD. In addition, the potential impact of novel procedures, e.g. subset chimerism or real-time PCR-based procedures, is discussed.
Collapse
Affiliation(s)
- Christian Thiede
- Medizinische Klinik und Poliklinik I, Universitätsklinikum Carl Gustav Carus der Technischen Universität, Dresden, Germany.
| | | | | |
Collapse
|
11
|
Isomura H, Yoshida M, Namba H, Yamada M. Interaction of human herpesvirus 6 with human CD34 positive cells. J Med Virol 2003; 70:444-50. [PMID: 12767009 DOI: 10.1002/jmv.10415] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We reported previously that human herpesvirus 6 (HHV-6) suppresses hematopoietic colony formation of erythroid (BFU-E), granulocyte/macrophage (CFU-GM), and megakaryocyte (CFU-Meg) lineages in vitro. Here we describe the interaction between HHV-6 and human CD34+ cells, which are a major source of hematopoietic progenitor cells. CD34+ cells were immunomagnetically isolated from cord blood mononuclear cells using anti-CD34+ antibodies coated onto either Dynabeads trade mark or MACS beads. The CD34+ population selected with Dynabeads showed a broad range of fluorescence. The population selected with MACS beads showed a narrow range of fluorescence. After infection with HHV-6, two transcripts of the immediate early genes were detected with both cell populations. HHV-6 suppressed colony formation of BFU-E, CFU-GM, and CFU-Meg. HHV-6 suppressed cell growth after 3 to 7 days culture in the presence of thrombopoietin (TPO). More differentiated CD34+ cells were more susceptible to the effects of HHV-6. These data indicate that the targets for hematopoietic suppression by HHV-6 are the differentiated cells.
Collapse
Affiliation(s)
- Hiroki Isomura
- Department of Virology, Okayama University Medical School, Okayama, Japan.
| | | | | | | |
Collapse
|
12
|
Penkowa M, Carrasco J, Giralt M, Molinero A, Hernández J, Campbell IL, Hidalgo J. Altered central nervous system cytokine-growth factor expression profiles and angiogenesis in metallothionein-I+II deficient mice. J Cereb Blood Flow Metab 2000; 20:1174-89. [PMID: 10950378 DOI: 10.1097/00004647-200008000-00003] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
To study the importance of metallothionein-I and -II (MT-I+II) for brain inflammation and regeneration, the authors examined normal and MT-I+II knock-out (MT-KO) mice subjected to a cortical freeze injury. Normal mice showed profound neurodegeneration, inflammation, and gliosis around the injury, which was repaired by 20 days postlesion (dpl). However, in MT-KO mice the lesion-associated inflammation was still present as late as 90 dpl. Scanning electron microscopy demonstrated that the number of capillaries was lower, and ultrastructural preservation of the lesioned parenchyma was poorer in MT-KO mice, suggesting an altered angiogenesis. To gain insight into the mechanisms involved, a number of cytokines and growth factors were evaluated. The number of cells expressing the proinflammatory cytokines IL-1beta, IL-6, and TNF-alpha was higher in MT-KO mice than in normal mice, which was confirmed by RNase protection analysis, whereas the number of cells expressing the growth factors bFGF, TGFbeta1, VEGF, and NT-3 was lower. Increased expression of proinflammatory cytokines could be involved in the sustained recruitment of CD-14+ and CD-34+ inflammatory cells and their altered functions observed in MT-KO mice. Decreases in trophic factors bFGF, TGFbeta1, and VEGF could mediate the decreased angiogenesis and regeneration observed in MT-KO mice after the freeze lesion. A role for MT-I+II in angiogenesis was also observed in transgenic mice expressing IL-6 under the control of the promoter of glial fibrillary acidic protein gene (GFAP-IL6 mice) because MT-I+II deficiency dramatically decreased the IL-6-induced angiogenesis of the GFAP-IL6 mice. In situ hybridization analysis indicated that the MT-III expression was not altered by MT-I+II deficiency. These results suggest that the MT-I+II isoforms have major regulatory functions in the brain inflammatory response to injury, especially in the angiogenesis process.
Collapse
Affiliation(s)
- M Penkowa
- Department of Medical Anatomy, The Panum Institute, University of Copenhagen, Denmark
| | | | | | | | | | | | | |
Collapse
|
13
|
Marti G, Johnsen H, Sutherland R, Serke S. A convergence of methods for a worldwide standard for CD34+ cell enumeration. JOURNAL OF HEMATOTHERAPY 1998; 7:105-9. [PMID: 9597567 DOI: 10.1089/scd.1.1998.7.105] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
14
|
Croockewit AJ, Raymakers RA, Preijers FW, Vierwinden G, de Witte TJ. The role of the different CD34 epitopes in detection and positive selection of CD34+ bone marrow and peripheral blood stem cells. Scand J Immunol 1998; 47:82-90. [PMID: 9467663 DOI: 10.1046/j.1365-3083.1998.00261.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Positive selection of CD34+ cells is an attractive approach to reduce tumour cell contamination in bone marrow (BM) and peripheral blood progenitor cell (PBPC) autografts in malignancies not expressing CD34. All current selection methods use monoclonal antibodies (MoAbs) specific for the class I or class II CD34 epitopes, while for detection most investigators use class III MoAbs. Since the distribution of the different CD34 epitopes on haematopoietic progenitors differs, we studied their significance in CD34+ selection procedures. Testing MoAbs against class I, II and III CD34 epitopes on normal BM we observed that +/- 23% of class III positive cells was class I negative. A higher expression of the class III epitope compared with classes I or II was observed on the KG1 cell line, whereas no differences in binding capability were found. The class III epitope anti-CD34, 561, was compared with the class I epitope anti-CD34, BI-3C5, both coupled to M450 Dynabeads. The yield of CD34+ cells obtained with the 561 beads was 1.7% of the mononuclear cells versus 0.95% using the class I epitope, a 1.95-fold increase (1.3-2.7), whereas the purity was similar (96% in both cases). The absolute number of CD34+ cells was therefore twofold higher after 561 selection, including cells with a more mature phenotype. In single cell assay comparable numbers of highly proliferative progenitors but higher numbers of differentiated colonies per phenotypic subfraction were measured. In conclusion, M450 beads coated with the 561 anti-class III CD34 epitope are more efficient in isolating CD34+ cells from bone marrow, probably due to a broader distribution of the class III epitope.
Collapse
Affiliation(s)
- A J Croockewit
- Department of Medicine, University Hospital Nijmegen, The Netherlands
| | | | | | | | | |
Collapse
|