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Koedijk JB, van der Werf I, Penter L, Vermeulen MA, Barneh F, Perzolli A, Meesters-Ensing JI, Fiocco M, de Groot-Kruseman HA, Moeniralam R, Christensen KB, Porter B, Pfaff K, Garcia JS, Rodig SJ, Wu CJ, Hasle H, Nierkens S, Belderbos ME, Zwaan CM, Heidenreich O. A multidimensional analysis reveals distinct immune phenotypes and tertiary lymphoid structure-like aggregates in the bone marrow of pediatric acute myeloid leukemia. medRxiv 2023:2023.03.03.23286485. [PMID: 37961528 PMCID: PMC10635226 DOI: 10.1101/2023.03.03.23286485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Because of the low mutational burden, children with acute myeloid leukemia (AML) are thought to have a 'cold' tumor microenvironment and consequently, a low likelihood of response to T cell-directed immunotherapies. Here, we provide a multidimensional overview of the tumor immune microenvironment in newly diagnosed pediatric AML. On a cohort level, we demonstrate wide variation in T cell infiltration with nearly one-third of cases harboring an immune-infiltrated bone marrow. These immune-infiltrated cases are characterized by a decreased abundance of M2-like macrophages, which we find to be associated with response to T cell-directed immunotherapy in adult AML. On an organizational level, we reveal the composition of spatially organized immune aggregates in pediatric AML, and show that in the adult setting such aggregates in post-treatment bone marrow and extramedullary sites associate with response to ipilimumab-based therapy. Altogether, our study provides immune correlates of response to T cell-directed immunotherapies and indicates starting points for further investigations into immunomodulatory mechanisms in AML.
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Affiliation(s)
- Joost B. Koedijk
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands
- Department of Pediatric Oncology, Erasmus MC/Sophia Children’s Hospital, 3015 GD Rotterdam, The Netherlands
| | - Inge van der Werf
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands
- Oncode Institute, 3521 AL, Utrecht, The Netherlands
| | - Livius Penter
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
- Broad Institute of Massachusetts Institute of Technology and Harvard University, Cambridge, MA, USA
- Harvard Medical School, Boston, MA, USA
- Department of Hematology, Oncology, and Tumorimmunology, Campus Virchow Klinikum, Berlin, Charité - Universitätsmedizin Berlin, Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Marijn A. Vermeulen
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands
| | - Farnaz Barneh
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands
| | - Alicia Perzolli
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands
- Department of Pediatric Oncology, Erasmus MC/Sophia Children’s Hospital, 3015 GD Rotterdam, The Netherlands
| | | | - Marta Fiocco
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands
- Mathematical Institute, Leiden University, Leiden, The Netherlands
- Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden, The Netherlands
| | | | - Rubina Moeniralam
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands
| | | | - Billie Porter
- Center for Immuno-Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Kathleen Pfaff
- Center for Immuno-Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Jacqueline S. Garcia
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
| | - Scott J. Rodig
- Department of Pathology, Brigham and Women’s Hospital, Boston, MA, USA
| | - Catherine J. Wu
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
- Broad Institute of Massachusetts Institute of Technology and Harvard University, Cambridge, MA, USA
- Harvard Medical School, Boston, MA, USA
- Department of Medicine, Brigham and Women’s Hospital, Boston, MA, USA
| | - Henrik Hasle
- Pediatrics and Adolescent Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Stefan Nierkens
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands
- Center for Translational Immunology, University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands
| | - Mirjam E. Belderbos
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands
| | - C. Michel Zwaan
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands
- Department of Pediatric Oncology, Erasmus MC/Sophia Children’s Hospital, 3015 GD Rotterdam, The Netherlands
| | - Olaf Heidenreich
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands
- Wolfson Childhood Cancer Research Centre, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
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Koedijk JB, van Beek TB, Vermeulen MA, Kester LA, Schweighart EK, Nierkens S, Belderbos ME, Zwaan CM, Heitink-Pollé KMJ, Heidenreich O. Case Report: Immune dysregulation associated with long-lasting regression of a (pre)leukemic clone. Front Immunol 2023; 14:1280885. [PMID: 37908360 PMCID: PMC10613973 DOI: 10.3389/fimmu.2023.1280885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 10/03/2023] [Indexed: 11/02/2023] Open
Abstract
Regression of leukemia in the absence of disease-modifying therapy remains poorly understood, although immunological mechanisms are thought to play a role. Here, we present a unique case of a 17-year-old boy with immune dysregulation and long-lasting regression of a (pre)leukemic clone in the absence of disease-modifying therapy. Using molecular and immunological analyses, we identified bone marrow features associated with disease control and loss thereof. In addition, our case reveals that detection of certain fusion genes with hardly any blasts in the bone marrow may be indicative of an accompanying oncogenic fusion gene, with implications for disease surveillance- and management in future patients.
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Affiliation(s)
- Joost B. Koedijk
- Department of Hemato-Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, Netherlands
- Department of Pediatric Oncology, Erasmus Medical Center (MC)/Sophia Children’s Hospital, Rotterdam, Netherlands
| | - Thomas B. van Beek
- Department of Hemato-Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, Netherlands
| | - Marijn A. Vermeulen
- Department of Hemato-Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, Netherlands
| | - Lennart A. Kester
- Department of Hemato-Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, Netherlands
| | - Elizabeth K. Schweighart
- Department of Hemato-Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, Netherlands
| | - Stefan Nierkens
- Department of Hemato-Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, Netherlands
- Center for Translational Immunology, University Medical Center Utrecht, Utrecht, Netherlands
| | - Mirjam E. Belderbos
- Department of Hemato-Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, Netherlands
| | - C. Michel Zwaan
- Department of Hemato-Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, Netherlands
- Department of Pediatric Oncology, Erasmus Medical Center (MC)/Sophia Children’s Hospital, Rotterdam, Netherlands
| | | | - Olaf Heidenreich
- Department of Hemato-Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, Netherlands
- Wolfson Childhood Cancer Research Centre, Newcastle University, Newcastle upon Tyne, United Kingdom
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Middelkamp S, Manders F, Peci F, van Roosmalen MJ, González DM, Bertrums EJ, van der Werf I, Derks LL, Groenen NM, Verheul M, Trabut L, Pleguezuelos-Manzano C, Brandsma AM, Antoniou E, Reinhardt D, Bierings M, Belderbos ME, van Boxtel R. Comprehensive single-cell genome analysis at nucleotide resolution using the PTA Analysis Toolbox. Cell Genom 2023; 3:100389. [PMID: 37719152 PMCID: PMC10504672 DOI: 10.1016/j.xgen.2023.100389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 05/30/2023] [Accepted: 08/02/2023] [Indexed: 09/19/2023]
Abstract
Detection of somatic mutations in single cells has been severely hampered by technical limitations of whole-genome amplification. Novel technologies including primary template-directed amplification (PTA) significantly improved the accuracy of single-cell whole-genome sequencing (WGS) but still generate hundreds of artifacts per amplification reaction. We developed a comprehensive bioinformatic workflow, called the PTA Analysis Toolbox (PTATO), to accurately detect single base substitutions, insertions-deletions (indels), and structural variants in PTA-based WGS data. PTATO includes a machine learning approach and filtering based on recurrence to distinguish PTA artifacts from true mutations with high sensitivity (up to 90%), outperforming existing bioinformatic approaches. Using PTATO, we demonstrate that hematopoietic stem cells of patients with Fanconi anemia, which cannot be analyzed using regular WGS, have normal somatic single base substitution burdens but increased numbers of deletions. Our results show that PTATO enables studying somatic mutagenesis in the genomes of single cells with unprecedented sensitivity and accuracy.
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Affiliation(s)
- Sjors Middelkamp
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
- Oncode Institute, Utrecht, the Netherlands
| | - Freek Manders
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
- Oncode Institute, Utrecht, the Netherlands
| | - Flavia Peci
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
- Oncode Institute, Utrecht, the Netherlands
| | - Markus J. van Roosmalen
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
- Oncode Institute, Utrecht, the Netherlands
| | - Diego Montiel González
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
- Oncode Institute, Utrecht, the Netherlands
| | - Eline J.M. Bertrums
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
- Oncode Institute, Utrecht, the Netherlands
- Department of Pediatric Oncology, Erasmus Medical Center – Sophia Children’s Hospital, Rotterdam, the Netherlands
| | - Inge van der Werf
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
- Oncode Institute, Utrecht, the Netherlands
| | - Lucca L.M. Derks
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
- Oncode Institute, Utrecht, the Netherlands
| | - Niels M. Groenen
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
- Oncode Institute, Utrecht, the Netherlands
| | - Mark Verheul
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
- Oncode Institute, Utrecht, the Netherlands
| | - Laurianne Trabut
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
- Oncode Institute, Utrecht, the Netherlands
| | - Cayetano Pleguezuelos-Manzano
- Oncode Institute, Utrecht, the Netherlands
- Hubrecht Institute, Royal Netherlands Academy of Arts and Sciences (KNAW) and UMC Utrecht, Utrecht, the Netherlands
| | - Arianne M. Brandsma
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
- Oncode Institute, Utrecht, the Netherlands
| | - Evangelia Antoniou
- Department of Pediatric Hematology and Oncology, University Hospital Essen, Essen, Germany
| | - Dirk Reinhardt
- Department of Pediatric Hematology and Oncology, University Hospital Essen, Essen, Germany
| | - Marc Bierings
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | | | - Ruben van Boxtel
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
- Oncode Institute, Utrecht, the Netherlands
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Müskens KF, Lindemans CA, Dandis R, Nierkens S, Belderbos ME. Definitions, incidence and outcome of poor graft function after hematopoietic cell transplantation: A systematic review and meta-analysis. Blood Rev 2023; 60:101076. [PMID: 36990959 DOI: 10.1016/j.blre.2023.101076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/17/2023] [Accepted: 03/20/2023] [Indexed: 03/29/2023]
Abstract
Poor graft function (PGF) after allogeneic hematopoietic stem cell transplantation (HCT) is a serious complication with high morbidity and mortality. The reported incidence of PGF, its risk factors and outcome vary substantially between studies. This variability may be explained by heterogeneity in patient cohorts and HCT strategies, differences in the underlying causes of cytopenia, as well as by differences in PGF definition. In this systematic review and meta-analysis, we provide an overview of the various PGF definitions used and determined the impact of this variability on the reported incidence and outcome. We searched MEDLINE, EMBASE and Web of Science up to July 2022, for any study on PGF in HCT recipients. We performed random-effect meta-analyses for incidence and outcome and subgroup analyses based on different PGF criteria. Among 69 included studies (14.265 HCT recipients), we found 63 different PGF definitions, using various combinations of 11 common criteria. The median incidence of PGF was 7% (IQR: 5-11%, 22 cohorts). The pooled survival of PGF patients was 53% (95% CI: 45-61%, 23 cohorts). The most commonly reported risk factors associated with PGF were history of cytomegalovirus infection and prior graft-versus-host disease. Incidence was lower in studies with strict cytopenic cutoffs, while survival was lower for primary compared to secondary PGF. This work indicates that a standardized, quantitative definition of PGF is needed to facilitate clinical guideline development and to advance scientific progress.
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Affiliation(s)
- Konradin F Müskens
- Princess Máxima Center for Pediatric Oncology, Heidelberglaan 25, 3584 CS Utrecht, the Netherlands
| | - Caroline A Lindemans
- Princess Máxima Center for Pediatric Oncology, Heidelberglaan 25, 3584 CS Utrecht, the Netherlands; Wilhelmina Children's Hospital, University Medical Center Utrecht, Lundlaan 6, 3584 EA Utrecht, the Netherlands
| | - Rana Dandis
- Princess Máxima Center for Pediatric Oncology, Heidelberglaan 25, 3584 CS Utrecht, the Netherlands
| | - Stefan Nierkens
- Princess Máxima Center for Pediatric Oncology, Heidelberglaan 25, 3584 CS Utrecht, the Netherlands; Center for Translational Immunology, Utrecht University, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, the Netherlands
| | - Mirjam E Belderbos
- Princess Máxima Center for Pediatric Oncology, Heidelberglaan 25, 3584 CS Utrecht, the Netherlands.
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5
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Wojtowicz EE, Mistry JJ, Uzun V, Hellmich C, Scoones A, Chin DW, Kettyle LM, Grasso F, Lord AM, Wright DJ, Etherington GJ, Woll PS, Belderbos ME, Bowles KM, Nerlov C, Haerty W, Bystrykh LV, Jacobsen SEW, Rushworth SA, Macaulay IC. Panhematopoietic RNA barcoding enables kinetic measurements of nucleate and anucleate lineages and the activation of myeloid clones following acute platelet depletion. Genome Biol 2023; 24:152. [PMID: 37370129 PMCID: PMC10294477 DOI: 10.1186/s13059-023-02976-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 05/22/2023] [Indexed: 06/29/2023] Open
Abstract
BACKGROUND Platelets and erythrocytes constitute over 95% of all hematopoietic stem cell output. However, the clonal dynamics of HSC contribution to these lineages remains largely unexplored. RESULTS We use lentiviral genetic labeling of mouse hematopoietic stem cells to quantify output from all lineages, nucleate, and anucleate, simultaneously linking these with stem and progenitor cell transcriptomic phenotypes using single-cell RNA-sequencing. We observe dynamic shifts of clonal behaviors through time in same-animal peripheral blood and demonstrate that acute platelet depletion shifts the output of multipotent hematopoietic stem cells to the exclusive production of platelets. Additionally, we observe the emergence of new myeloid-biased clones, which support short- and long-term production of blood cells. CONCLUSIONS Our approach enables kinetic studies of multi-lineage output in the peripheral blood and transcriptional heterogeneity of individual hematopoietic stem cells. Our results give a unique insight into hematopoietic stem cell reactivation upon platelet depletion and of clonal dynamics in both steady state and under stress.
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Affiliation(s)
- Edyta E Wojtowicz
- Earlham Institute, Norwich Research Park, Norwich, UK.
- Norwich Medical School, University of East Anglia, Norwich, UK.
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden.
- Department of Medicine, Huddinge, Center for Hematology and Regenerative Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.
| | - Jayna J Mistry
- Earlham Institute, Norwich Research Park, Norwich, UK
- Norwich Medical School, University of East Anglia, Norwich, UK
| | - Vladimir Uzun
- Earlham Institute, Norwich Research Park, Norwich, UK
| | - Charlotte Hellmich
- Norwich Medical School, University of East Anglia, Norwich, UK
- Norfolk and Norwich University Hospital, Norwich, UK
| | - Anita Scoones
- Earlham Institute, Norwich Research Park, Norwich, UK
| | - Desmond W Chin
- Department of Medicine, Huddinge, Center for Hematology and Regenerative Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
| | - Laura M Kettyle
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
- Department of Medicine, Huddinge, Center for Hematology and Regenerative Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
| | - Francesca Grasso
- Department of Medicine, Huddinge, Center for Hematology and Regenerative Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
| | - Allegra M Lord
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
- Department of Medicine, Huddinge, Center for Hematology and Regenerative Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
| | | | | | - Petter S Woll
- Department of Medicine, Huddinge, Center for Hematology and Regenerative Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
| | | | - Kristian M Bowles
- Norwich Medical School, University of East Anglia, Norwich, UK
- Norfolk and Norwich University Hospital, Norwich, UK
| | - Claus Nerlov
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Wilfried Haerty
- Earlham Institute, Norwich Research Park, Norwich, UK
- School of Biological Sciences, University of East Anglia, Norwich, UK
| | - Leonid V Bystrykh
- European Research Institute for the Biology of Ageing (ERIBA), University Medical Center of Groningen (UMCG), University of Groningen, Groningen, The Netherlands
| | - Sten Eirik W Jacobsen
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden.
- Department of Medicine, Huddinge, Center for Hematology and Regenerative Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK.
| | | | - Iain C Macaulay
- Earlham Institute, Norwich Research Park, Norwich, UK.
- Norwich Medical School, University of East Anglia, Norwich, UK.
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Bystrykh LV, Belderbos ME. Measures of Clonal Hematopoiesis: Are We Missing Something? Front Med (Lausanne) 2022; 9:836141. [PMID: 35433751 PMCID: PMC9008402 DOI: 10.3389/fmed.2022.836141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 03/08/2022] [Indexed: 11/17/2022] Open
Abstract
Clonal Hematopoiesis (CH) is a common, age-related phenomenon of growing scientific interest, due to its association with hematologic malignancy, cardiovascular disease and decreased overall survival. CH is commonly attributed to the preferential outgrowth of a mutant hematopoietic stem cell (HSC) with enhanced fitness, resulting in clonal imbalance. In-depth understanding of the relation between HSC clonal dynamics, CH and hematologic malignancy requires integration of fundamental lineage tracing studies with clinical data. However, this is hampered by lack of a uniform definition of CH and by inconsistency in the analytical methods used for its quantification. Here, we propose a conceptual and analytical framework for the definition and measurement of CH. First, we transformed the conceptual definition of CH into the CH index, which provides a quantitative measure of clone numbers and sizes. Next, we generated a set of synthetic data, based on the beta-distribution, to simulate clonal populations with different degrees of imbalance. Using these clonal distributions and the CH index as a reference, we tested several established indices of clonal diversity and (in-)equality for their ability to detect and quantify CH. We found that the CH index was distinct from any of the other tested indices. Nonetheless, the diversity indices (Shannon, Simpson) more closely resembled the CH index than the inequality indices (Gini, Pielou). Notably, whereas the inequality indices mainly responded to changes in clone sizes, the CH index and the tested diversity indices also responded to changes in the number of clones in a sample. Accordingly, these simulations indicate that CH can result not only by skewing clonal abundancies, but also by variation in their overall numbers. Altogether, our model-based approach illustrates how a formalized definition and quantification of CH can provide insights into its pathogenesis. In the future, use of the CH index or Shannon index to quantify clonal diversity in fundamental as well as clinical clone-tracing studies will promote cross-disciplinary discussion and progress in the field.
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Affiliation(s)
- Leonid V. Bystrykh
- Department for Stem Cell Biology and Ageing, European Research Institute for the Biology of Ageing, University Medical Center Groningen, Groningen, Netherlands
- *Correspondence: Leonid V. Bystrykh,
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Brandsma AM, Bertrums EJM, van Roosmalen MJ, Hofman DA, Oka R, Verheul M, Manders F, Ubels J, Belderbos ME, van Boxtel R. Mutation signatures of pediatric acute myeloid leukemia and normal blood progenitors associated with differential patient outcomes. Blood Cancer Discov 2021; 2:484-499. [PMID: 34642666 PMCID: PMC7611805 DOI: 10.1158/2643-3230.bcd-21-0010] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
A subset of pediatric AML cases harbors more somatic mutations in their genomes compared to normal blood progenitors. This subset displays expression profiles that resemble more committed progenitors and associates with better patient survival. Acquisition of oncogenic mutations with age is believed to be rate limiting for carcinogenesis. However, the incidence of leukemia in children is higher than in young adults. Here we compare somatic mutations across pediatric acute myeloid leukemia (pAML) patient-matched leukemic blasts and hematopoietic stem and progenitor cells (HSPC), as well as HSPCs from age-matched healthy donors. HSPCs in the leukemic bone marrow have limited genetic relatedness and share few somatic mutations with the cell of origin of the malignant blasts, suggesting polyclonal hematopoiesis in patients with pAML. Compared with normal HSPCs, a subset of pAML cases harbored more somatic mutations and a distinct composition of mutational process signatures. We hypothesize that these cases might have arisen from a more committed progenitor. This subset had better outcomes than pAML cases with mutation burden comparable with age-matched healthy HSPCs. Our study provides insights into the etiology and patient stratification of pAML.
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Affiliation(s)
- Arianne M Brandsma
- Princess Máxima Center for Pediatric Oncology and Oncode Institute, Heidelberglaan 25, 3584CS Utrecht, The Netherlands
| | - Eline J M Bertrums
- Princess Máxima Center for Pediatric Oncology and Oncode Institute, Heidelberglaan 25, 3584CS Utrecht, The Netherlands
| | - Markus J van Roosmalen
- Princess Máxima Center for Pediatric Oncology and Oncode Institute, Heidelberglaan 25, 3584CS Utrecht, The Netherlands
| | - Damon A Hofman
- Princess Máxima Center for Pediatric Oncology and Oncode Institute, Heidelberglaan 25, 3584CS Utrecht, The Netherlands
| | - Rurika Oka
- Princess Máxima Center for Pediatric Oncology and Oncode Institute, Heidelberglaan 25, 3584CS Utrecht, The Netherlands
| | - Mark Verheul
- Princess Máxima Center for Pediatric Oncology and Oncode Institute, Heidelberglaan 25, 3584CS Utrecht, The Netherlands
| | - Freek Manders
- Princess Máxima Center for Pediatric Oncology and Oncode Institute, Heidelberglaan 25, 3584CS Utrecht, The Netherlands
| | - Joske Ubels
- Princess Máxima Center for Pediatric Oncology and Oncode Institute, Heidelberglaan 25, 3584CS Utrecht, The Netherlands
| | - Mirjam E Belderbos
- Princess Máxima Center for Pediatric Oncology and Oncode Institute, Heidelberglaan 25, 3584CS Utrecht, The Netherlands
| | - Ruben van Boxtel
- Princess Máxima Center for Pediatric Oncology and Oncode Institute, Heidelberglaan 25, 3584CS Utrecht, The Netherlands
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8
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Müskens KF, Lindemans CA, Belderbos ME. Hematopoietic Dysfunction during Graft-Versus-Host Disease: A Self-Destructive Process? Cells 2021; 10:cells10082051. [PMID: 34440819 PMCID: PMC8392486 DOI: 10.3390/cells10082051] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/27/2021] [Accepted: 08/03/2021] [Indexed: 11/16/2022] Open
Abstract
Graft-versus-host disease (GvHD) is a major complication of allogeneic hematopoietic (stem) cell transplantation (HCT). Clinically, GvHD is associated with severe and long-lasting hematopoietic dysfunction, which may contribute to the high mortality of GvHD after HCT. During GvHD, excessive immune activation damages both hematopoietic stem and progenitor cells and their surrounding bone marrow niche, leading to a reduction in cell number and functionality of both compartments. Hematopoietic dysfunction can be further aggravated by the occurrence—and treatment—of HCT-associated complications. These include immune suppressive therapy, coinciding infections and their treatment, and changes in the microbiome. In this review, we provide a structured overview of GvHD-mediated hematopoietic dysfunction, including the targets in the bone marrow, the mechanisms of action and the effect of GvHD-related complications and their treatment. This information may aid in the identification of treatment options to improve hematopoietic function in patients, during and after GvHD.
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Affiliation(s)
- Konradin F. Müskens
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands; (K.F.M.); (C.A.L.)
| | - Caroline A. Lindemans
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands; (K.F.M.); (C.A.L.)
- Wilhelmina Children’s Hospital, University Medical Center Utrecht, 3584 EA Utrecht, The Netherlands
| | - Mirjam E. Belderbos
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands; (K.F.M.); (C.A.L.)
- Correspondence:
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9
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Belderbos ME, Amelink GJ, Dankbaar JW, Linn FHH. [Posture-dependent headache caused by spontaneous intracranial hypotension]. Ned Tijdschr Geneeskd 2021; 165:D5411. [PMID: 33793124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A 36-year-old woman presented with a 3-4 month history of severe, progressive headache. The headache was characterized by postural variation, with excruciating headache in the upright position and near-immediate relief upon recumbence. There was no history of trauma or lumbar puncture. Gadolineum-enhanced brain MRI revealed abnormalities characteristic intracranial hypotension. Spinal MRI showed a longitudinal extradural fluid collection; a localization of the dural defect was not found. The patient was treated with caffeine, bed rest and lumbar epidural blood patches; she recovered completely. Severe orthostatic headache which aggravates upon standing and is relieved by recumbence, can be caused by spontaneous intracranial hypotension. Recognition of its characteristic symptoms is needed for timely referral. Treatment is usually successful and can prevent life-threatening complications.
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Affiliation(s)
- M E Belderbos
- Universitair Medisch Centrum Utrecht, Prinses Máxima Centrum voor Kinderoncologie, Utrecht
- Contact: M. E. Belderbos
| | - G J Amelink
- Universitair Medisch Centrum Utrecht, afd. Neurochirurgie, Utrecht
| | - J W Dankbaar
- Universitair Medisch Centrum Utrecht, afd. Radiologie, Utrecht
| | - F H H Linn
- Universitair Medisch Centrum Utrecht, afd. Neurologie, Utrecht
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10
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Jacobs S, Ausema A, Zwart E, Weersing E, de Haan G, Bystrykh LV, Belderbos ME. Detection of chemotherapy-resistant patient-derived acute lymphoblastic leukemia clones in murine xenografts using cellular barcodes. Exp Hematol 2020; 91:46-54. [PMID: 32946982 DOI: 10.1016/j.exphem.2020.09.188] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Revised: 09/09/2020] [Accepted: 09/12/2020] [Indexed: 01/07/2023]
Abstract
Clonal heterogeneity fuels leukemia evolution, therapeutic resistance, and relapse. Upfront detection of therapy-resistant leukemia clones at diagnosis may allow adaptation of treatment and prevention of relapse, but this is hampered by a paucity of methods to identify and trace single leukemia-propagating cells and their clonal offspring. Here, we tested methods of cellular barcoding analysis, to trace the in vivo competitive dynamics of hundreds of patient-derived leukemia clones upon chemotherapy-mediated selective pressure. We transplanted Nod/Scid/Il2Rγ-/- (NSG) mice with barcoded patient-derived or SupB15 acute lymphoblastic leukemia (ALL) cells and assessed clonal responses to dexamethasone, methotrexate, and vincristine, longitudinally and across nine anatomic locations. We illustrate that chemotherapy reduces clonal diversity in a drug-dependent manner. At end-stage disease, methotrexate-treated patient-derived xenografts had significantly fewer clones compared with placebo-treated mice (100 ± 10 vs. 160 ± 15 clones, p = 0.0005), while clonal complexity in vincristine- and dexamethasone-treated xenografts was unaffected (115 ± 33 and 150 ± 7 clones, p = NS). Using tools developed to assess differential gene expression, we determined whether these clonal patterns resulted from random clonal drift or selection. We identified 5 clones that were reproducibly enriched in methotrexate-treated patient-derived xenografts, suggestive of pre-existent resistance. Finally, we found that chemotherapy-mediated selection resulted in a more asymmetric distribution of leukemia clones across anatomic sites. We found that cellular barcoding is a powerful method to trace the clonal dynamics of human patient-derived leukemia cells in response to chemotherapy. In the future, integration of cellular barcoding with single-cell sequencing technology may allow in-depth characterization of therapy-resistant leukemia clones and identify novel targets to prevent relapse.
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Affiliation(s)
- Sabrina Jacobs
- Department of Ageing Biology and Stem Cells, European Research Institute for the Biology of Ageing, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Albertina Ausema
- Department of Ageing Biology and Stem Cells, European Research Institute for the Biology of Ageing, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Erik Zwart
- Department of Ageing Biology and Stem Cells, European Research Institute for the Biology of Ageing, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Ellen Weersing
- Department of Ageing Biology and Stem Cells, European Research Institute for the Biology of Ageing, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Gerald de Haan
- Department of Ageing Biology and Stem Cells, European Research Institute for the Biology of Ageing, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Leonid V Bystrykh
- Department of Ageing Biology and Stem Cells, European Research Institute for the Biology of Ageing, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Mirjam E Belderbos
- Oncode Institute, Utrecht, The Netherlands; Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands.
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11
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Di Genua C, Valletta S, Buono M, Stoilova B, Sweeney C, Rodriguez-Meira A, Grover A, Drissen R, Meng Y, Beveridge R, Aboukhalil Z, Karamitros D, Belderbos ME, Bystrykh L, Thongjuea S, Vyas P, Nerlov C. C/EBPα and GATA-2 Mutations Induce Bilineage Acute Erythroid Leukemia through Transformation of a Neomorphic Neutrophil-Erythroid Progenitor. Cancer Cell 2020; 37:690-704.e8. [PMID: 32330454 PMCID: PMC7218711 DOI: 10.1016/j.ccell.2020.03.022] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 01/12/2020] [Accepted: 03/27/2020] [Indexed: 01/08/2023]
Abstract
Acute erythroid leukemia (AEL) commonly involves both myeloid and erythroid lineage transformation. However, the mutations that cause AEL and the cell(s) that sustain the bilineage leukemia phenotype remain unknown. We here show that combined biallelic Cebpa and Gata2 zinc finger-1 (ZnF1) mutations cooperatively induce bilineage AEL, and that the major leukemia-initiating cell (LIC) population has a neutrophil-monocyte progenitor (NMP) phenotype. In pre-leukemic NMPs Cebpa and Gata2 mutations synergize by increasing erythroid transcription factor (TF) expression and erythroid TF chromatin access, respectively, thereby installing ectopic erythroid potential. This erythroid-permissive chromatin conformation is retained in bilineage LICs. These results demonstrate that synergistic transcriptional and epigenetic reprogramming by leukemia-initiating mutations can generate neomorphic pre-leukemic progenitors, defining the lineage identity of the resulting leukemia.
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Affiliation(s)
- Cristina Di Genua
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK
| | - Simona Valletta
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK
| | - Mario Buono
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK
| | - Bilyana Stoilova
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK; NIHR Oxford Biomedical Research Center, John Radcliffe Hospital, University of Oxford, Oxford OX3 9DU, UK
| | - Connor Sweeney
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK; NIHR Oxford Biomedical Research Center, John Radcliffe Hospital, University of Oxford, Oxford OX3 9DU, UK
| | - Alba Rodriguez-Meira
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK
| | - Amit Grover
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK
| | - Roy Drissen
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK
| | - Yiran Meng
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK
| | - Ryan Beveridge
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK
| | - Zahra Aboukhalil
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK; NIHR Oxford Biomedical Research Center, John Radcliffe Hospital, University of Oxford, Oxford OX3 9DU, UK
| | - Dimitris Karamitros
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK; NIHR Oxford Biomedical Research Center, John Radcliffe Hospital, University of Oxford, Oxford OX3 9DU, UK
| | - Mirjam E Belderbos
- Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, the Netherlands
| | - Leonid Bystrykh
- European Research Institute for the Biology of Ageing, University Medical Center Groningen, 9713 AV Groningen, the Netherlands
| | - Supat Thongjuea
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK; MRC WIMM Centre for Computational Biology, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, UK; NIHR Oxford Biomedical Research Center, John Radcliffe Hospital, University of Oxford, Oxford OX3 9DU, UK
| | - Paresh Vyas
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK; NIHR Oxford Biomedical Research Center, John Radcliffe Hospital, University of Oxford, Oxford OX3 9DU, UK
| | - Claus Nerlov
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK.
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12
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Belderbos ME, Jacobs S, Koster TK, Ausema A, Weersing E, Zwart E, de Haan G, Bystrykh LV. Donor-to-Donor Heterogeneity in the Clonal Dynamics of Transplanted Human Cord Blood Stem Cells in Murine Xenografts. Biol Blood Marrow Transplant 2019; 26:16-25. [PMID: 31494231 DOI: 10.1016/j.bbmt.2019.08.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 07/31/2019] [Accepted: 08/26/2019] [Indexed: 01/12/2023]
Abstract
Umbilical cord blood (UCB) provides an alternative source of hematopoietic stem cells (HSCs) for allogeneic transplantation. Administration of sufficient donor HSCs is critical to restore recipient hematopoiesis and to maintain long-term polyclonal blood formation. However, due to lack of unique markers, the frequency of HSCs among UCB CD34+ cells is the subject of ongoing debate, urging for reproducible strategies for their counting. Here, we used cellular barcoding to determine the frequency and clonal dynamics of human UCB HSCs and to determine how data analysis methods affect these parameters. We transplanted lentivirally barcoded CD34+ cells from 20 UCB donors into Nod/Scid/IL2Ry-/- (NSG) mice (n = 30). Twelve recipients (of 8 UCB donors) engrafted with >1% GFP+ cells, allowing for clonal analysis by multiplexed barcode deep sequencing. Using multiple definitions of clonal diversity and strategies for data filtering, we demonstrate that differences in data analysis can change clonal counts by several orders of magnitude and propose methods to improve their consistency. Using these methods, we show that the frequency of NSG-repopulating cells was low (median ∼1 HSC/104 CD34+ UCB cells) and could vary up to 10-fold between donors. Clonal patterns in blood became increasingly consistent over time, likely reflecting initial output of transient progenitors, followed by long-term HSCs with stable hierarchies. The majority of long-term clones displayed multilineage output, yet clones with lymphoid- or myeloid-biased output were also observed. Altogether, this study uncovers substantial interdonor and analysis-induced variability in the frequency of UCB CD34+ clones that contribute to post-transplant hematopoiesis. As clone tracing is increasingly relevant, we urge for universal and transparent methods to count HSC clones during normal aging and upon transplantation.
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Affiliation(s)
- Mirjam E Belderbos
- Department of Stem Cell Biology and Ageing, European Research Institute for the Biology of Ageing, University of Groningen, Groningen, Netherlands; Princess Máxima Center for Pediatric Oncology and Oncode Institute, Utrecht, Netherlands.
| | - Sabrina Jacobs
- Department of Stem Cell Biology and Ageing, European Research Institute for the Biology of Ageing, University of Groningen, Groningen, Netherlands
| | - Taco K Koster
- Department of Stem Cell Biology and Ageing, European Research Institute for the Biology of Ageing, University of Groningen, Groningen, Netherlands
| | - Albertina Ausema
- Department of Stem Cell Biology and Ageing, European Research Institute for the Biology of Ageing, University of Groningen, Groningen, Netherlands
| | - Ellen Weersing
- Department of Stem Cell Biology and Ageing, European Research Institute for the Biology of Ageing, University of Groningen, Groningen, Netherlands
| | - Erik Zwart
- Department of Stem Cell Biology and Ageing, European Research Institute for the Biology of Ageing, University of Groningen, Groningen, Netherlands
| | - Gerald de Haan
- Department of Stem Cell Biology and Ageing, European Research Institute for the Biology of Ageing, University of Groningen, Groningen, Netherlands
| | - Leonid V Bystrykh
- Department of Stem Cell Biology and Ageing, European Research Institute for the Biology of Ageing, University of Groningen, Groningen, Netherlands
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13
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Belderbos ME, Gennery AR, Dvorak CC, Blok HJ, Eikema DJ, Silva JMF, Veys P, Neven B, Buckley R, Cole T, Cowan MJ, Goebel WS, Hoenig M, Kuo CY, Stiehm ER, Wynn R, Bierings M. Outcome of domino hematopoietic stem cell transplantation in human subjects: An international case series. J Allergy Clin Immunol 2018; 142:1628-1631.e4. [PMID: 29981805 DOI: 10.1016/j.jaci.2018.06.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 06/14/2018] [Accepted: 06/27/2018] [Indexed: 11/26/2022]
Affiliation(s)
- Mirjam E Belderbos
- Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands.
| | - Andrew R Gennery
- Department of Pediatric Immunology, Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Christopher C Dvorak
- Pediatric Allergy Immunology and Blood and Marrow Transplant Division, University of California-San Francisco, Benioff Children's Hospital, San Francisco, Calif
| | - Henric-Jan Blok
- Department of Medical Statistics and Bioinformatics, Leiden University Medical Center, Leiden, The Netherlands
| | - Dirk-Jan Eikema
- Department of Medical Statistics and Bioinformatics, Leiden University Medical Center, Leiden, The Netherlands
| | - Juliana M F Silva
- Department of Bone Marrow Transplantation, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Paul Veys
- Department of Bone Marrow Transplantation, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Bénédicte Neven
- Department of Pediatric Hematology-Immunology, Hospital Necker-Enfants Malades, Assistance Publique-Hôspitaux de Paris, INSERM, Paris, France
| | - Rebecca Buckley
- Departments of Pediatrics and Immunology, Duke University School of Medicine, Duke University Medical Center, Durham, NC
| | - Theresa Cole
- Department of Allergy and Immunology, Royal Children's Hospital, Melbourne, Australia
| | - Morton J Cowan
- Pediatric Allergy Immunology and Blood and Marrow Transplant Division, University of California-San Francisco, Benioff Children's Hospital, San Francisco, Calif
| | - W Scott Goebel
- Department of Pediatrics and the Pediatric Stem Cell Transplantation Program, Indiana University School of Medicine, Riley Hospital for Children, Indianapolis, Ind
| | - Manfred Hoenig
- Department of Pediatrics, University Medical Center Ulm, Ulm, Germany
| | - Caroline Y Kuo
- Division of Allergy, Immunology and Rheumatology, Department of Pediatrics, David Geffen School of Medicine, UCLA Medical Center, Los Angeles, Calif
| | - E Richard Stiehm
- Division of Allergy, Immunology and Rheumatology, Department of Pediatrics, David Geffen School of Medicine, UCLA Medical Center, Los Angeles, Calif
| | - Robert Wynn
- Department of Pediatric Blood and Marrow Transplant, Royal Manchester Children's Hospital, Manchester, United Kingdom
| | - Marc Bierings
- Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands; Department of Pediatric Hematology and Stem Cell Transplantation, Wilhelmina Children's Hospital, Utrecht, The Netherlands.
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14
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Abstract
In this issue of JEM, Wu et al. (https://doi.org/10.1084/jem.20171341) use genetic barcoding of macaque hematopoietic stem cells to demonstrate that, after transplantation, HSCs are very asymmetrically distributed and uncover a thymus-independent pathway for mature T cell production in the bone marrow.
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Affiliation(s)
- Mirjam E Belderbos
- Department of Stem Cell Biology and Ageing, European Research Institute for the Biology of Ageing, University Medical Center Groningen, University of Groningen, Netherlands; Princess Máxima Center for Pediatric Oncology, Utrecht, Netherlands
| | - Leonid Bystrykh
- Department of Stem Cell Biology and Ageing, European Research Institute for the Biology of Ageing, University Medical Center Groningen, University of Groningen, Netherlands; Princess Máxima Center for Pediatric Oncology, Utrecht, Netherlands
| | - Gerald de Haan
- Department of Stem Cell Biology and Ageing, European Research Institute for the Biology of Ageing, University Medical Center Groningen, University of Groningen, Netherlands; Princess Máxima Center for Pediatric Oncology, Utrecht, Netherlands
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15
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Cornish-Bowden A, Cornish-Bowden A, Rasnick D, Heng HH, Horne S, Abdallah B, Liu G, Ye CJ, Bloomfield M, Vincent MD, Aldaz CM, Karlsson J, Valind A, Jansson C, Gisselsson D, Graves JAM, Stepanenko AA, Andreieva SV, Korets KV, Mykytenko DO, Huleyuk NL, Baklaushev VP, Kovaleva OA, Chekhonin VP, Vassetzky YS, Avdieiev SS, Bakker B, Taudt AS, Belderbos ME, Porubsky D, Spierings DCJ, de Jong TV, Halsema N, Kazemier HG, Hoekstra-Wakker K, Bradley A, de Bont ESJM, van den Berg A, Guryev V, Lansdorp PM, Tatché MC, Foijer F, Liehr T, Baudoin NC, Nicholson JM, Soto K, Quintanilla I, Camps J, Cimini D, Dürrbaum M, Donnelly N, Passerini V, Kruse C, Habermann B, Storchová Z, Mandrioli D, Belpoggi F, Silbergeld EK, Perry MJ, Skotheim RI, Løvf M, Johannessen B, Hoff AM, Zhao S, SveeStrømme JM, Sveen A, Lothe RA, Hehlmann R, Voskanyan A, Fabarius A, Böcking A, Biesterfeld S, Berynskyy L, Börgermann C, Engers R, Dietz J, Fritz A, Sehgal N, Vecerova J, Stojkovicz B, Ding H, Page N, Tye C, Bhattacharya S, Xu J, Stein G, Stein J, Berezney R, Gong X, Grasedieck S, Swoboda J, Rücker FG, Bullinger L, Pollack JR, Roumelioti FM, Chiourea M, Raftopoulou C, Gagos S, Duesberg P, Bloomfield M, Hwang S, Gustafsson HT, O’Sullivan C, Acevedo-Colina A, Huang X, Klose C, Schevchenko A, Dickson RC, Cavaliere P, Dephoure N, Torres EM, Stampfer MR, Vrba L, LaBarge MA, Futscher B, Garbe JC, Zhou YH, Trinh AL, Zhou YH, Digman M. Abstracts from the 3rd Conference on Aneuploidy and Cancer: Clinical and Experimental Aspects. Mol Cytogenet 2017. [PMCID: PMC5499067 DOI: 10.1186/s13039-017-0320-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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16
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Bakker B, Taudt A, Belderbos ME, Porubsky D, Spierings DCJ, de Jong TV, Halsema N, Kazemier HG, Hoekstra-Wakker K, Bradley A, de Bont ESJM, van den Berg A, Guryev V, Lansdorp PM, Colomé-Tatché M, Foijer F. Single-cell sequencing reveals karyotype heterogeneity in murine and human malignancies. Genome Biol 2016; 17:115. [PMID: 27246460 PMCID: PMC4888588 DOI: 10.1186/s13059-016-0971-7] [Citation(s) in RCA: 122] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Accepted: 04/29/2016] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Chromosome instability leads to aneuploidy, a state in which cells have abnormal numbers of chromosomes, and is found in two out of three cancers. In a chromosomal instable p53 deficient mouse model with accelerated lymphomagenesis, we previously observed whole chromosome copy number changes affecting all lymphoma cells. This suggests that chromosome instability is somehow suppressed in the aneuploid lymphomas or that selection for frequently lost/gained chromosomes out-competes the CIN-imposed mis-segregation. RESULTS To distinguish between these explanations and to examine karyotype dynamics in chromosome instable lymphoma, we use a newly developed single-cell whole genome sequencing (scWGS) platform that provides a complete and unbiased overview of copy number variations (CNV) in individual cells. To analyse these scWGS data, we develop AneuFinder, which allows annotation of copy number changes in a fully automated fashion and quantification of CNV heterogeneity between cells. Single-cell sequencing and AneuFinder analysis reveals high levels of copy number heterogeneity in chromosome instability-driven murine T-cell lymphoma samples, indicating ongoing chromosome instability. Application of this technology to human B cell leukaemias reveals different levels of karyotype heterogeneity in these cancers. CONCLUSION Our data show that even though aneuploid tumours select for particular and recurring chromosome combinations, single-cell analysis using AneuFinder reveals copy number heterogeneity. This suggests ongoing chromosome instability that other platforms fail to detect. As chromosome instability might drive tumour evolution, karyotype analysis using single-cell sequencing technology could become an essential tool for cancer treatment stratification.
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Affiliation(s)
- Bjorn Bakker
- European Research Institute for the Biology of Ageing, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
| | - Aaron Taudt
- European Research Institute for the Biology of Ageing, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
| | - Mirjam E Belderbos
- European Research Institute for the Biology of Ageing, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
- Department of Paediatrics, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
| | - David Porubsky
- European Research Institute for the Biology of Ageing, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
| | - Diana C J Spierings
- European Research Institute for the Biology of Ageing, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
| | - Tristan V de Jong
- European Research Institute for the Biology of Ageing, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
| | - Nancy Halsema
- European Research Institute for the Biology of Ageing, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
| | - Hinke G Kazemier
- European Research Institute for the Biology of Ageing, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
| | - Karina Hoekstra-Wakker
- European Research Institute for the Biology of Ageing, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
| | - Allan Bradley
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, CB10 1SA, UK
| | - Eveline S J M de Bont
- Department of Paediatrics, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
| | - Anke van den Berg
- Department of Pathology & Medical Biology, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
| | - Victor Guryev
- European Research Institute for the Biology of Ageing, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
| | - Peter M Lansdorp
- European Research Institute for the Biology of Ageing, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands
- Terry Fox Laboratory, BC Cancer Agency, Vancouver, BC, V5Z 1L3, Canada
- Division of Hematology, Department of Medicine, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
| | - Maria Colomé-Tatché
- European Research Institute for the Biology of Ageing, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands.
- Institute of Computational Biology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg, 85764, Germany.
| | - Floris Foijer
- European Research Institute for the Biology of Ageing, University of Groningen, University Medical Center Groningen, A. Deusinglaan 1, Groningen, 9713 AV, The Netherlands.
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17
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Abstract
Cellular barcoding is a recently rediscovered tool to trace the clonal output of individual cells with genetically distinct and heritable DNA sequences. Each year a few dozens of papers are published using the cellular barcoding technique. Those publications largely focus on mutually related issues, namely: counting cells capable of clonal proliferation and expansion, monitoring clonal dynamics in time, tracing the origin of differentiated cells, characterizing the differentiation potential of stem cells and similar topics. Apart from their biological content, claims and conclusions, these studies show remarkable diversity in technical aspects of the barcoding method and sometimes in major conclusions. Although a diversity of approaches is quite usual in data analysis, deviant handling of barcode data might directly affect experimental results and their biological interpretation. Here, we will describe typical challenges and caveats in cellular barcoding publications available so far.
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Affiliation(s)
- Leonid V Bystrykh
- Laboratory of Ageing Biology and Stem Cells, European Research Institute for the Biology of Ageing, University Medical Center Groningen, University of Groningen, Antonius Deusinglaan 1, Building 3226, Groningen, 9713, AV, The Netherlands.
| | - Mirjam E Belderbos
- Laboratory of Ageing Biology and Stem Cells, European Research Institute for the Biology of Ageing, University Medical Center Groningen, University of Groningen, Antonius Deusinglaan 1, Building 3226, Groningen, 9713, AV, The Netherlands
- Department of Pediatrics, University Medical Center Groningen, Groningen, The Netherlands
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18
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Abstract
Plasma is a rich mixture of immune regulatory factors that shape immune cell function. This immunomodulatory role of plasma is especially important in neonates. To maintain in utero feto-maternal tolerance and to allow for microbial colonization after birth, the neonatal immune system is biased against pro-inflammatory responses while favoring immune suppression. Therefore, the neonatal period provides a unique opportunity to study the physiologic mechanisms regulating the immune system. Several recent studies in neonates have identified plasma factors that play a key role in immune regulation. Insight into immune regulation by neonatal and adult plasma may have clinical implications, because plasma is easily accessible, affordable, and widely available. Herein, we review plasma-mediated immune regulation, with specific focus on neonatal plasma. We discuss how immune suppression is a key function of plasma and provide a systematic overview of the published literature regarding plasma-derived immune suppressive proteins, lipids, purines, and sugars. Finally, we outline how immune regulation by these factors, which are particularly abundant in neonatal plasma, may eventually be used to treat immune-mediated diseases, such as autoimmune, allergic, and inflammatory diseases.
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Abstract
Neonates are born with quantitative and qualitative defects in both adaptive and innate immune responses. The immune system is regulated by several mechanisms, including the signalling of inhibitory receptors. Increased expression of inhibitory receptors may result in a higher threshold for activation and suppressed function of neonatal cells. The aim of this study was to determine whether the expression of seven inhibitory receptors is increased on neonatal immune cells compared to adult immune cells. In a healthy birth cohort, we examined the expression of seven inhibitory immune receptors on neonatal neutrophils, monocytes, natural killer (NK) cells, CD4(+) and CD8(+)T cells. The expression of leucocyte-associated immunoglobulin (Ig)-like receptor-1 (LAIR-1), signal inhibitory receptor on leucocytes-1 (SIRL-1), CD31, signal-regulatory protein alpha (SIRPα), Siglec-9, CD200R, immune receptor expressed on myeloid cells-1 (IREM-1) and the membrane-bound ligand CD200 was studied by flow cytometry on leucocytes in cord blood (n = 14), neonatal venous blood (n = 24) and adult venous blood (n = 22). Expression of LAIR-1, CD31 and CD200 was increased consistently across all neonatal T cell subsets. Neonatal monocytes exhibited decreased expression of LAIR-1 and IREM-1 compared to adults. Furthermore, cord blood and neonatal venous blood samples contained a distinct LAIR-1-positive neutrophil population, which was not detected in adult blood. We demonstrated distinct expression of inhibitory receptors on neonatal peripheral blood immune cells in a healthy birth cohort. This is the first evidence that inhibitory receptors play a role in regulation of the neonatal immune system. Consistently increased inhibitory receptor expression on T cells may be an important mechanism in preventing the development of allergy and autoimmunity.
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Affiliation(s)
- J Walk
- Department of Paediatrics, Wilhelmina Children's Hospital, Utrecht, The Netherlands
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20
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Belderbos ME, Levy O, Stalpers F, Kimpen JL, Meyaard L, Bont L. Neonatal plasma polarizes TLR4-mediated cytokine responses towards low IL-12p70 and high IL-10 production via distinct factors. PLoS One 2012; 7:e33419. [PMID: 22442690 PMCID: PMC3307729 DOI: 10.1371/journal.pone.0033419] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Accepted: 02/08/2012] [Indexed: 01/01/2023] Open
Abstract
Human neonates are highly susceptible to infection, which may be due in part to impaired innate immune function. Neonatal Toll-like receptor (TLR) responses are biased against the generation of pro-inflammatory/Th1-polarizing cytokines, yet the underlying mechanisms are incompletely defined. Here, we demonstrate that neonatal plasma polarizes TLR4-mediated cytokine production. When exposed to cord blood plasma, mononuclear cells (MCs) produced significantly lower TLR4-mediated IL-12p70 and higher IL-10 compared to MC exposed to adult plasma. Suppression by neonatal plasma of TLR4-mediated IL-12p70 production, but not induction of TLR4-mediated IL-10 production, was maintained up to the age of 1 month. Cord blood plasma conferred a similar pattern of MC cytokine responses to TLR3 and TLR8 agonists, demonstrating activity towards both MyD88-dependent and MyD88-independent agonists. The factor causing increased TLR4-mediated IL-10 production by cord blood plasma was heat-labile, lost after protein depletion and independent of lipoprotein binding protein (LBP) or soluble CD14 (sCD14). The factor causing inhibition of TLR4-mediated IL-12p70 production by cord blood plasma was resistant to heat inactivation or protein depletion and was independent of IL-10, vitamin D and prostaglandin E2. In conclusion, human neonatal plasma contains at least two distinct factors that suppress TLR4-mediated IL-12p70 production or induce IL-10 or production. Further identification of these factors will provide insight into the ontogeny of innate immune development and might identify novel targets for the prevention and treatment of neonatal infection.
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Affiliation(s)
- Mirjam E Belderbos
- Department of Pediatrics, University Medical Center Utrecht, Utrecht, The Netherlands.
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Belderbos ME, Houben ML, van Bleek GM, Schuijff L, van Uden NOP, Bloemen-Carlier EM, Kimpen JLL, Eijkemans MJC, Rovers M, Bont LJ. Breastfeeding modulates neonatal innate immune responses: a prospective birth cohort study. Pediatr Allergy Immunol 2012; 23:65-74. [PMID: 22103307 DOI: 10.1111/j.1399-3038.2011.01230.x] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Neonatal Toll-like receptor (TLR) responses are biased toward Th2-polarizing responses at birth and rapidly mature toward more balanced responses during the first month of life. Postnatal TLR maturation may be guided by environmental exposure. AIMS To determine the environmental determinants of neonatal TLR function. MATERIALS AND METHODS A prospective birth cohort study was performed in 291 healthy term neonates. Mode of delivery, breastfeeding, birth month, siblings, pets and parental smoking were analyzed in relation to neonatal innate immune parameters at the age of 1 month. Whole blood concentrations of innate immune cells were measured by flow cytometry. In vitro TLR-mediated cytokine production was determined by ELISA. RESULTS Breastfeeding was the major determinant of neonatal innate immunity, associated with 5 (31%) of neonatal innate immune parameters, of which the association with TLR7-mediated IL-10 production was most significant (76 pg/ml in breastfed neonates vs. 293 pg/ml in formula-fed neonates, p = 0.001). Of innate immune variables, TLR3-mediated IL-12p70 production was highly associated with environmental exposures (pets, breastfeeding and mode of delivery), whereas TLR9-mediated cytokine responses were not associated with any environmental factor. CONCLUSION Neonatal innate immune responses are differentially modulated by environmental exposure in the first month of life. The protective effect of breastfeeding against subsequent infections and atopy might be explained by its innate immune modulatory effects in the first month of life.
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Affiliation(s)
- M E Belderbos
- Department of Pediatrics, University Medical Center Utrecht, Utrecht, The Netherlands.
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22
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Power Coombs MR, Belderbos ME, Gallington LC, Bont L, Levy O. Adenosine modulates Toll-like receptor function: basic mechanisms and translational opportunities. Expert Rev Anti Infect Ther 2011; 9:261-9. [PMID: 21342073 DOI: 10.1586/eri.10.158] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Adenosine is an endogenous purine metabolite whose concentration in human blood plasma rises from nanomolar to micromolar concentrations during the inflammatory process. Leukocytes express seven-transmembrane adenosine receptors whose engagement modulates Toll-like receptor-mediated cytokine responses, in part via modulation of intracellular cyclic adenosine monophosphate. Adenosine analogs are used clinically to treat arrhythmias and apnea of prematurity. Herein, we consider the potential of adenosine analogs as innate immune response modifiers to prevent and/or treat infection.
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Affiliation(s)
- Melanie R Power Coombs
- Department of Medicine/Infectious Diseases, Children's Hospital Boston, 300 Longwood Avenue, Boston, MA 02115, USA
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Belderbos ME, Houben ML, Wilbrink B, Lentjes E, Bloemen EM, Kimpen JLL, Rovers M, Bont L. Cord blood vitamin D deficiency is associated with respiratory syncytial virus bronchiolitis. Pediatrics 2011; 127:e1513-20. [PMID: 21555499 DOI: 10.1542/peds.2010-3054] [Citation(s) in RCA: 237] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Respiratory syncytial virus (RSV) is the most important pathogen causing severe lower respiratory tract infection (LRTI) in infants. Epidemiologic and basic studies suggest that vitamin D may protect against RSV LRTI. OBJECTIVE To determine the association between plasma vitamin D concentrations at birth and the subsequent risk of RSV LRTI. DESIGN A prospective birth cohort study was performed in healthy term neonates. Concentrations of 25-hydroxyvitamin D (25-OHD) in cord blood plasma were related to RSV LRTI in the first year of life, defined as parent-reported LRTI symptoms in a daily log and simultaneous presence of RSV RNA in a nose-throat specimen. RESULTS The study population included 156 neonates. Eighteen (12%) developed RSV LRTI. The mean plasma 25-OHD concentration was 82 nmol/L. Overall, 27% of neonates had 25-OHD concentrations < 50 nmol/L, 27% had 50-74 nmol/L and only 46% had 25-OHD 75 nmol/L. Cord blood 25-OHD concentrations were strongly associated with maternal vitamin D3 supplementation during pregnancy. Concentrations of 25-OHD were lower in neonates who subsequently developed RSV LRTI compared with those who did not (65 nmol/L versus 84 nmol/L, P = .009). Neonates born with 25-OHD concentrations <50 nmol/L had a sixfold (95% confidence interval: 1.6-24.9; P = .01) increased risk of RSV LRTI in the first year of life compared with those with 25-OHD concentrations ≥ 75 nmol/L. CONCLUSIONS Vitamin D deficiency in healthy neonates is associated with increased risk of RSV LRTI in the first year of life. Intensified routine vitamin D supplementation during pregnancy may be a useful strategy to prevent RSV LRTI during infancy.
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Houben ML, Bont L, Wilbrink B, Belderbos ME, Kimpen JLL, Visser GHA, Rovers MM. Clinical prediction rule for RSV bronchiolitis in healthy newborns: prognostic birth cohort study. Pediatrics 2011; 127:35-41. [PMID: 21187309 DOI: 10.1542/peds.2010-0581] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVE Our goal was to determine predictors of respiratory syncytial virus (RSV) lower respiratory tract infection (LRTI) among healthy newborns. METHODS In this prospective birth cohort study, 298 healthy term newborns born in 2 large hospitals in the Netherlands were monitored throughout the first year of life. Parents kept daily logs and collected nose/throat swabs during respiratory tract infections. The primary outcome was RSV LRTI, which was defined on the basis of the combination of positive RSV polymerase chain reaction results and acute wheeze or moderate/severe cough. RESULTS Of the 298 children, 42 (14%) developed RSV LRTI. Independent predictors for RSV LRTI were day care attendance and/or siblings, high parental education level, birth weight of >4 kg, and birth in April to September. The area under the receiver operating characteristic curve was 0.72 (95% confidence interval: 0.64-0.80). We derived a clinical prediction rule; possible scores ranged from 0 to 5 points. The absolute risk of RSV LRTI was 3% for children with scores of ≤2 (20% of all children) and 32% for children with all 4 factors (scores of 5; 8% of all children). Furthermore, 62% of the children with RSV LRTI experienced wheezing during the first year of life, compared with 36% of the children without RSV LRTI. CONCLUSIONS A simple clinical prediction rule identifies healthy newborns at risk of RSV LRTI. Physicians can differentiate between children with high and low risks of RSV LRTI and subsequently can target preventive and monitoring strategies toward children at high risk.
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Affiliation(s)
- Michiel L Houben
- Department of Pediatrics, Wilhelmina Children's Hospital, Utrecht, Netherlands
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Houben ML, Coenjaerts FEJ, Rossen JWA, Belderbos ME, Hofland RW, Kimpen JLL, Bont L. Disease severity and viral load are correlated in infants with primary respiratory syncytial virus infection in the community. J Med Virol 2010; 82:1266-71. [PMID: 20513094 PMCID: PMC7167003 DOI: 10.1002/jmv.21771] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Respiratory syncytial virus (RSV) is a major cause of respiratory tract infections in infants, with remarkable variability in disease severity. Factors determining severity of disease in previously healthy infants are still unclear. It was hypothesized that disease severity is correlated with viral load in primary RSV infection. Infants of a healthy birth cohort were included at signs of their first respiratory tract infection. Nasopharyngeal aspirate was obtained within 48-96 hr and disease severity was assessed with a previously published severity scoring model. PCR was applied to test the aspirates in a semi-quantitative way for the presence of 10 respiratory pathogens. In case of multiple infection, the pathogen with the highest load was defined as the primary pathogen. The correlation between disease severity and viral load was analyzed. A total of 82 infants were included over a period of 2 years. Median age at first respiratory tract infection was 3 months. Pathogens were detected in 77 (94%) infants; more than one pathogen was detected in 35 (43%) infants. RSV was present in aspirates of 30 infants; in 16 aspirates RSV was the primary pathogen. A negative correlation between RSV CT-value and disease severity was found in all RSV cases (rho = -0.52, P = 0.003) and in cases with RSV as the primary pathogen (rho = -0.54, P = 0.03). In conclusion, this is the first report on viral loads in previously healthy infants with RSV infection in the community. Disease severity correlated positively with viral load during primary RSV infection.
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Affiliation(s)
- M L Houben
- Department of Pediatrics, Utrecht University Medical Center, Utrecht, the Netherlands
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Belderbos ME, van Bleek GM, Levy O, Blanken MO, Houben ML, Schuijff L, Kimpen JLL, Bont L. Skewed pattern of Toll-like receptor 4-mediated cytokine production in human neonatal blood: low LPS-induced IL-12p70 and high IL-10 persist throughout the first month of life. Clin Immunol 2009; 133:228-37. [PMID: 19648060 DOI: 10.1016/j.clim.2009.07.003] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2009] [Revised: 06/27/2009] [Accepted: 07/02/2009] [Indexed: 10/20/2022]
Abstract
Newborns are highly susceptible to infectious diseases, which may be due to impaired immune responses. This study aims to characterize the ontogeny of neonatal TLR-based innate immunity during the first month of life. Cellularity and Toll-like receptor (TLR) agonist-induced cytokine production were compared between cord blood obtained from healthy neonates born after uncomplicated gestation and delivery (n=18), neonatal venous blood obtained at the age of one month (n=96), and adult venous blood (n=17). Cord blood TLR agonist-induced production of the Th1-polarizing cytokines IL-12p70 and IFN-alpha was generally impaired, but for TLR3, 7 and 9 agonists, rapidly increased to adult levels during the first month of life. In contrast, TLR4 demonstrated a slower maturation, with low LPS-induced IL-12p70 production and high IL-10 production up until the age of one month. Polarization in neonatal cytokine responses to LPS could contribute to neonatal susceptibility to severe bacterial infection.
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Affiliation(s)
- M E Belderbos
- Wilhelmina Children's Hospital, University Medical Centre Utrecht, Utrecht, The Netherlands
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