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Chen L, Pronk E, van Dijk C, Bian Y, Feyen J, van Tienhoven T, Yildirim M, Pisterzi P, de Jong MM, Bastidas A, Hoogenboezem RM, Wevers C, Bindels EM, Löwenberg B, Cupedo T, Sanders MA, Raaijmakers MH. A Single-Cell Taxonomy Predicts Inflammatory Niche Remodeling to Drive Tissue Failure and Outcome in Human AML. Blood Cancer Discov 2023; 4:394-417. [PMID: 37470778 PMCID: PMC10472197 DOI: 10.1158/2643-3230.bcd-23-0043] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 06/09/2023] [Accepted: 07/14/2023] [Indexed: 07/21/2023] Open
Abstract
Cancer initiation is orchestrated by an interplay between tumor-initiating cells and their stromal/immune environment. Here, by adapted single-cell RNA sequencing, we decipher the predicted signaling between tissue-resident hematopoietic stem/progenitor cells (HSPC) and their neoplastic counterparts with their native niches in the human bone marrow. LEPR+ stromal cells are identified as central regulators of hematopoiesis through predicted interactions with all cells in the marrow. Inflammatory niche remodeling and the resulting deprivation of critical HSPC regulatory factors are predicted to repress high-output hematopoietic stem cell subsets in NPM1-mutated acute myeloid leukemia (AML), with relative resistance of clonal cells. Stromal gene signatures reflective of niche remodeling are associated with reduced relapse rates and favorable outcomes after chemotherapy across all genetic risk categories. Elucidation of the intercellular signaling defining human AML, thus, predicts that inflammatory remodeling of stem cell niches drives tissue repression and clonal selection but may pose a vulnerability for relapse-initiating cells in the context of chemotherapeutic treatment. SIGNIFICANCE Tumor-promoting inflammation is considered an enabling characteristic of tumorigenesis, but mechanisms remain incompletely understood. By deciphering the predicted signaling between tissue-resident stem cells and their neoplastic counterparts with their environment, we identify inflammatory remodeling of stromal niches as a determinant of normal tissue repression and clinical outcomes in human AML. See related commentary by Lisi-Vega and Méndez-Ferrer, p. 349. This article is featured in Selected Articles from This Issue, p. 337.
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Affiliation(s)
- Lanpeng Chen
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Eline Pronk
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Claire van Dijk
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Yujie Bian
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Jacqueline Feyen
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Tim van Tienhoven
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Meltem Yildirim
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Paola Pisterzi
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Madelon M.E. de Jong
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Alejandro Bastidas
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | | | - Chiel Wevers
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Eric M. Bindels
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Bob Löwenberg
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Tom Cupedo
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
| | - Mathijs A. Sanders
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
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2
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Feyen J, Ernst MPT, van der Velden VHJ, Valk PJM, Broeders L, Touw IP, Raaijmakers MHGP. A congenital CSF3R mutation in chronic neutropenia reveals a vital role for a cytokine receptor extracellular hinge motif in the response to granulocyte colony-stimulating factor. Pediatr Blood Cancer 2023; 70:e30039. [PMID: 36316822 DOI: 10.1002/pbc.30039] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 08/26/2022] [Accepted: 08/29/2022] [Indexed: 02/24/2023]
Abstract
We describe a patient with congenital neutropenia (CN) with a homozygous germline mutation in the colony-stimulating factor 3 receptor gene (CSF3R). The patient's bone marrow shows lagging neutrophil development with subtle left shift and unresponsiveness to CSF3 in in vitro colony assays. This patient illustrates that the di-proline hinge motif in the extracellular cytokine receptor homology domain of CSF3R is critical for adequate neutrophil production, but dispensable for in vivo terminal neutrophil maturation. This report underscores that CN patients with inherited CSF3R mutations should be marked as a separate clinical entity, characterized by a failure to respond to CSF3.
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Affiliation(s)
- Jacqueline Feyen
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Martijn P T Ernst
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | | | - Peter J M Valk
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Lianne Broeders
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Ivo P Touw
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
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3
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Feyen J, Ping Z, Chen L, van Dijk C, van Tienhoven TVD, van Strien PMH, Hoogenboezem RM, Wevers MJW, Sanders MA, Touw IP, Raaijmakers MHGP. Myeloid cells promote interferon signaling-associated deterioration of the hematopoietic system. Nat Commun 2022; 13:7657. [PMID: 36496394 PMCID: PMC9741615 DOI: 10.1038/s41467-022-35318-x] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 11/28/2022] [Indexed: 12/13/2022] Open
Abstract
Innate and adaptive immune cells participate in the homeostatic regulation of hematopoietic stem cells (HSCs). Here, we interrogate the contribution of myeloid cells, the most abundant cell type in the mammalian bone marrow, in a clinically relevant mouse model of neutropenia. Long-term genetic depletion of neutrophils and eosinophils results in activation of multipotent progenitors but preservation of HSCs. Depletion of myeloid cells abrogates HSC expansion, loss of serial repopulation and lymphoid reconstitution capacity and remodeling of HSC niches, features previously associated with hematopoietic aging. This is associated with mitigation of interferon signaling in both HSCs and their niches via reduction of NK cell number and activation. These data implicate myeloid cells in the functional decline of hematopoiesis, associated with activation of interferon signaling via a putative neutrophil-NK cell axis. Innate immunity may thus come at the cost of system deterioration through enhanced chronic inflammatory signaling to stem cells and their niches.
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Affiliation(s)
- Jacqueline Feyen
- grid.508717.c0000 0004 0637 3764Department of Hematology, Erasmus MC Cancer Institute, 3015CN Rotterdam, the Netherlands
| | - Zhen Ping
- grid.508717.c0000 0004 0637 3764Department of Hematology, Erasmus MC Cancer Institute, 3015CN Rotterdam, the Netherlands
| | - Lanpeng Chen
- grid.508717.c0000 0004 0637 3764Department of Hematology, Erasmus MC Cancer Institute, 3015CN Rotterdam, the Netherlands
| | - Claire van Dijk
- grid.508717.c0000 0004 0637 3764Department of Hematology, Erasmus MC Cancer Institute, 3015CN Rotterdam, the Netherlands
| | - Tim V. D. van Tienhoven
- grid.508717.c0000 0004 0637 3764Department of Hematology, Erasmus MC Cancer Institute, 3015CN Rotterdam, the Netherlands
| | - Paulina M. H. van Strien
- grid.508717.c0000 0004 0637 3764Department of Hematology, Erasmus MC Cancer Institute, 3015CN Rotterdam, the Netherlands
| | - Remco M. Hoogenboezem
- grid.508717.c0000 0004 0637 3764Department of Hematology, Erasmus MC Cancer Institute, 3015CN Rotterdam, the Netherlands
| | - Michiel J. W. Wevers
- grid.508717.c0000 0004 0637 3764Department of Hematology, Erasmus MC Cancer Institute, 3015CN Rotterdam, the Netherlands
| | - Mathijs A. Sanders
- grid.508717.c0000 0004 0637 3764Department of Hematology, Erasmus MC Cancer Institute, 3015CN Rotterdam, the Netherlands
| | - Ivo P. Touw
- grid.508717.c0000 0004 0637 3764Department of Hematology, Erasmus MC Cancer Institute, 3015CN Rotterdam, the Netherlands
| | - Marc H. G. P. Raaijmakers
- grid.508717.c0000 0004 0637 3764Department of Hematology, Erasmus MC Cancer Institute, 3015CN Rotterdam, the Netherlands
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Kenswil KJG, Pisterzi P, Feyen J, Ter Borg M, Rombouts E, Braakman E, Raaijmakers MHGP. Immune composition and its association with hematologic recovery after chemotherapeutic injury in acute myeloid leukemia. Exp Hematol 2021; 105:32-38.e2. [PMID: 34800603 DOI: 10.1016/j.exphem.2021.11.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 10/15/2021] [Accepted: 11/10/2021] [Indexed: 11/25/2022]
Abstract
Chemotherapy-induced bone marrow (BM) injury is a significant cause of morbidity and mortality in acute myeloid leukemia (AML). Time to hematologic recovery after standard ("7 + 3") myeloablative chemotherapy can vary considerably among patients, but the factors that drive or predict BM recovery remain incompletely understood. Here, we assessed the composition of innate and adaptive immune subsets in the regenerating BM (day 17) after induction chemotherapy and related it to hematologic recovery in AML. T cells, and in particular the CD4 central memory (CD4CM) T-cell subset, were significantly enriched in the BM after chemotherapy, suggesting the relative chemoresistance of cells providing long-term memory for systemic pathogens. In contrast, B cells and other hematopoietic subsets were depleted. Higher frequencies of the CD4CM T-cell subset were associated with delayed hematopoietic recovery, whereas a high frequency of natural killer (NK) cells was related to faster recovery of neutrophil counts. The NK/CD4CM ratio in the BM after chemotherapy was significantly associated with the time to subsequent neutrophil recovery (Spearman's ρ = -0.723, p < 0.001, false discovery rate <0.01). The data provide novel insights into adaptive immune cell recovery after injury and identify the NK/CD4CM index as a putative predictor of hematopoietic recovery in AML.
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Affiliation(s)
| | - Paola Pisterzi
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Jacqueline Feyen
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Mariëtte Ter Borg
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Elwin Rombouts
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Eric Braakman
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
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5
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Kenswil KJG, Pisterzi P, Sánchez-Duffhues G, van Dijk C, Lolli A, Knuth C, Vanchin B, Jaramillo AC, Hoogenboezem RM, Sanders MA, Feyen J, Cupedo T, Costa IG, Li R, Bindels EMJ, Lodder K, Blom B, Bos PK, Goumans MJ, Ten Dijke P, Farrell E, Krenning G, Raaijmakers MHGP. Endothelium-derived stromal cells contribute to hematopoietic bone marrow niche formation. Cell Stem Cell 2021; 28:653-670.e11. [PMID: 33561425 DOI: 10.1016/j.stem.2021.01.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [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: 03/20/2020] [Revised: 09/29/2020] [Accepted: 01/11/2021] [Indexed: 12/22/2022]
Abstract
Bone marrow stromal cells (BMSCs) play pivotal roles in tissue maintenance and regeneration. Their origins, however, remain incompletely understood. Here we identify rare LNGFR+ cells in human fetal and regenerative bone marrow that co-express endothelial and stromal markers. This endothelial subpopulation displays transcriptional reprogramming consistent with endothelial-to-mesenchymal transition (EndoMT) and can generate multipotent stromal cells that reconstitute the bone marrow (BM) niche upon transplantation. Single-cell transcriptomics and lineage tracing in mice confirm robust and sustained contributions of EndoMT to bone precursor and hematopoietic niche pools. Interleukin-33 (IL-33) is overexpressed in subsets of EndoMT cells and drives this conversion process through ST2 receptor signaling. These data reveal generation of tissue-forming BMSCs from mouse and human endothelial cells and may be instructive for approaches to human tissue regeneration.
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Affiliation(s)
| | - Paola Pisterzi
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam 3015 CN, the Netherlands
| | - Gonzalo Sánchez-Duffhues
- Department of Cell and Chemical Biology, Leiden University Medical Centre, Leiden 2300 RC, the Netherlands
| | - Claire van Dijk
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam 3015 CN, the Netherlands
| | - Andrea Lolli
- Department of Oral and Maxillofacial Surgery, Erasmus MC, University Medical Center Rotterdam, Rotterdam 3000 DR, the Netherlands
| | - Callie Knuth
- Department of Oral and Maxillofacial Surgery, Erasmus MC, University Medical Center Rotterdam, Rotterdam 3000 DR, the Netherlands
| | - Byambasuren Vanchin
- Cardiovascular Regenerative Medicine Research Group, Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, Groningen 9713 GZ, the Netherlands
| | | | | | - Mathijs Arnoud Sanders
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam 3015 CN, the Netherlands
| | - Jacqueline Feyen
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam 3015 CN, the Netherlands
| | - Tom Cupedo
- Department of Hematology, Erasmus MC Cancer Institute, Rotterdam 3015 CN, the Netherlands
| | - Ivan G Costa
- Institute for Computational Genomics, Joint Research Center for Computational Biomedicine, RWTH Aachen, Aachen 52074, Germany
| | - Ronghui Li
- Institute for Computational Genomics, Joint Research Center for Computational Biomedicine, RWTH Aachen, Aachen 52074, Germany
| | | | - Kirsten Lodder
- Department of Cell and Chemical Biology, Leiden University Medical Centre, Leiden 2300 RC, the Netherlands
| | - Bianca Blom
- Amsterdam UMC, University of Amsterdam, Department of Experimental Immunology, Amsterdam institute for Infection & Immunity, Amsterdam 1105 AZ, the Netherlands
| | - Pieter Koen Bos
- Department of Orthopaedics, Erasmus MC, Rotterdam 3015CE, the Netherlands
| | - Marie-José Goumans
- Department of Cell and Chemical Biology, Leiden University Medical Centre, Leiden 2300 RC, the Netherlands
| | - Peter Ten Dijke
- Department of Cell and Chemical Biology, Leiden University Medical Centre, Leiden 2300 RC, the Netherlands; Oncode Institute, Leiden University Medical Centre, Leiden 2300 RC, the Netherlands
| | - Eric Farrell
- Department of Oral and Maxillofacial Surgery, Erasmus MC, University Medical Center Rotterdam, Rotterdam 3000 DR, the Netherlands
| | - Guido Krenning
- Cardiovascular Regenerative Medicine Research Group, Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, Groningen 9713 GZ, the Netherlands
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6
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Van Bergen T, Jonckx B, Moons L, Feyen J, Stalmans I. Complementary effects of PlGF inhibition and MMC in the improvement of surgical outcome after glaucoma filtration surgery. Acta Ophthalmol 2015. [DOI: 10.1111/j.1755-3768.2015.0345] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- T. Van Bergen
- Ophthalmology; ThromboGenics NV; Heverlee Belgium
- Lab of Ophthalmology; KU Leuven; Leuven Belgium
| | - B. Jonckx
- Ophthalmology; ThromboGenics NV; Heverlee Belgium
| | - L. Moons
- Lab of Ophthalmology; KU Leuven; Leuven Belgium
- Department of Biology-Zoological Institute; KU Leuven; Leuven Belgium
| | - J. Feyen
- Ophthalmology; ThromboGenics NV; Heverlee Belgium
| | - I. Stalmans
- Lab of Ophthalmology; KU Leuven; Leuven Belgium
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7
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Willekens K, Reyns G, Jonckx B, Feyen J, Yewei L, Coudyzer W, Yicheng N, Stalmans P. Imaging of intravitreal injected solution dispersion. Acta Ophthalmol 2015. [DOI: 10.1111/j.1755-3768.2015.1417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - G. Reyns
- Thrombogenics, Research and Development; Leuven Belgium
| | - B. Jonckx
- Thrombogenics, Research and Development; Leuven Belgium
| | - J. Feyen
- Thrombogenics, Research and Development; Leuven Belgium
| | - L. Yewei
- Radiology; UZ Leuven; Leuven Belgium
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8
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Etienne I, Jonckx B, Feyen J. Posterior vitreous detachment: more a case of the fibronectin interface than the inner limiting membrane? Acta Ophthalmol 2015. [DOI: 10.1111/j.1755-3768.2015.0322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - B. Jonckx
- ThromboGenics NV; R&D; Leuven Belgium
| | - J. Feyen
- ThromboGenics NV; R&D; Leuven Belgium
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9
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Willekens K, Reyns G, Jonckx B, Feyen J, Yewei L, Coudyzer W, Yicheng N, Stalmans P. Imaging of intravitreal injected solution dispersion. Acta Ophthalmol 2015. [DOI: 10.1111/j.1755-3768.2015.0417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - G. Reyns
- Thrombogenics; Research and Development; Leuven Belgium
| | - B. Jonckx
- Thrombogenics; Research and Development; Leuven Belgium
| | - J. Feyen
- Thrombogenics; Research and Development; Leuven Belgium
| | - L. Yewei
- Radiology; UZ Leuven; Leuven Belgium
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10
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Utz KH, Schneider D, Feyen J, Grüner M, Bayer S, Fimmers R, Müller F. Complete denture displacement following open-mouth reline. J Oral Rehabil 2012; 39:838-46. [DOI: 10.1111/j.1365-2842.2012.02339.x] [Citation(s) in RCA: 2] [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] [Accepted: 06/13/2012] [Indexed: 11/27/2022]
Affiliation(s)
- K.-H. Utz
- Department of Prosthetic Dentistry, Propaedeutics and Dental Materials; University of Bonn; Bonn
| | - D. Schneider
- Department of Prosthetic Dentistry, Propaedeutics and Dental Materials; University of Bonn; Bonn
| | - J. Feyen
- Private Practice, Lennestadt; Germany
| | - M. Grüner
- Department of Prosthetic Dentistry, Propaedeutics and Dental Materials; University of Bonn; Bonn
| | - S. Bayer
- Department of Prosthetic Dentistry, Propaedeutics and Dental Materials; University of Bonn; Bonn
| | - R. Fimmers
- Institute for Medical Biometrics, Informatics and Epidemiology (IMBIE); Bonn; Germany
| | - F. Müller
- Division of Gerodontology and Removable Prosthodontics; University of Geneva; Geneva; Switzerland
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11
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Verstraeten WW, Veroustraete F, Feyen J. Soil moisture retrieval from optical and thermal spaceborne remote sensing. Commun Agric Appl Biol Sci 2005; 70:27-30. [PMID: 16366269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Affiliation(s)
- W W Verstraeten
- Laboratory of Soil and Water Management, Katholieke Universiteit Leuven, Belgium
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Verstraeten WW, Veroustraete F, Feyen J. Estimating European forest evapo transpiration by processing NOAA/AVHRR and METEOSAT imagery. Commun Agric Appl Biol Sci 2004; 69:333-6. [PMID: 15560254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Affiliation(s)
- W W Verstraeten
- Teledetectie en Aardobservatieprocessen, Vito Boeretang 200, B-2400 Mol, Belgium
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Abstract
In this study, the transport and fate of nitrate within the soil profile and nitrate leaching to drains were analyzed by comparing historic field data with the simulation results of the DRAINMOD model. The nitrogen version of DRAINMOD was used to simulate the performance of the nitrogen transport and transformation of the Hooibeekhoeve experiment, situated in the sandy region of the Kempen (Belgium) and conducted for a 30-year (1969-1998) period. In the analysis, a continuous cropping with maize was assumed. Comparisons between experimentally measured and simulated state variables indicate that the nitrate concentrations in the soil and nitrate leaching to drains are controlled by the fertilizer practice, the initial conditions, and the rainfall depth and distribution. Furthermore, the study reveals that the model used gives a fair description of the nitrogen dynamics in the soil and subsurface drainage at field scale. From the comparative analysis between experimental data and simulation results it can also be concluded that the model after calibration is a useful tool to optimize as a function of the combination "climate-crop-soil-bottom boundary condition" the nitrogen application strategy resulting in an acceptable level of nitrate leaching for the environment.
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Affiliation(s)
- A El-Sadek
- Katholieke Universiteit Leuven, Hyddrauliccs Laboratory, Faculty of Engineering, Heverlee, Belgium.
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14
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Abstract
To model catchment surface water quantity and quality, different model types are available. They vary from detailed physically based models to simplified conceptual and empirical models. The most appropriate model type for a certain application depends on the project objectives and the data availability. The detailed models are very useful for short-term simulations of representative events. They cannot be used for long-term statistical information or as a management tool. For those purposes, more simplified (conceptual or meta-) models must be used. In this study, nitrogen dynamics are modeled in a river in Flanders. Nitrogen sources from agricultural leaching and domestic point sources are considered. Based on this input, concentrations of ammonium (NH4-N) and nitrate (NO3-N) in the river water are modeled in MIKE 11 by taking into consideration advection and dispersion and the most important biological and chemical processes. Model calibration was done on the basis of available measured water quality data. To this detailed model, a more simplified model was calibrated with the objective to more easily yield long-term simulation results that can be used in a statistical analysis. The results show that the conceptual simplified model is 1800 times faster than the MIKE 11 model. Moreover the two models have almost the same accuracy. The detailed models are recommended for short-term simulations unless there are enough data for model input and model parameters. The conceptual simplified model is recommended for long-term simulations.
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Affiliation(s)
- M Radwan
- K.U. Leuven, Hydraulics Laboratory, Faculty of Engineering, Heverlee, Belgium.
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15
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Jacques D, Mohanty B, Timmerman A, Feyen J. Study of time dependency of factors affecting the spatial distribution of soil water content in a field-plot. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s1464-1909(01)00060-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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16
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Missbach M, Jeschke M, Feyen J, Müller K, Glatt M, Green J, Susa M. A novel inhibitor of the tyrosine kinase Src suppresses phosphorylation of its major cellular substrates and reduces bone resorption in vitro and in rodent models in vivo. Bone 1999; 24:437-49. [PMID: 10321903 DOI: 10.1016/s8756-3282(99)00020-4] [Citation(s) in RCA: 141] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The tyrosine kinase Src has been implicated in the process of osteoclast-mediated bone resorption. Here, we describe a novel class of Src inhibitors, substituted 5,7-diphenyl-pyrrolo[2,3-d]pyrimidines, and characterize one of them, CGP77675, in vitro and in models of bone resorption in vivo. In vitro, CGP77675 inhibited phosphorylation of peptide substrates and autophosphorylation of purified Src (concentration producing half-maximal inhibition [IC50] values 5-20 and 40 nmol/L, respectively). The compound was selective toward other protein kinases: the Src IC50 value was lower than those for Cdc2 (>500-fold), epidermal growth factor (EGF) receptor (7.5-fold), and vascular endothelial growth factor receptor (>50-fold), and for v-Abl (15-fold) and focal adhesion kinase (Fak) (>25-fold). The Src kinase family members Lck and Yes were inhibited with IC50 values 20-fold higher than or equal to Src. To measure the inhibition of cellular Src activity, we identified the major tyrosine-phosphorylated proteins in an Src-overexpressing cell line IC8.1 as Src, Fak, and paxillin. CGP77675 potently inhibited tyrosine phosphorylation of the Src substrates Fak and paxillin, but had much less effect on Src (IC50 values 0.3, 0.5, and 5.7 micromol/L). The phosphorylation of Src in IC8.1 cells reflected phosphorylation of the negative regulatory tyrosine 527 (Y527); thus, the inhibitor was selective against the Y527 C-terminal Src kinase Csk. In osteoblastic MC3T3-E1 cells, CGP77675 inhibited signaling induced by PDGF at the receptor level, but not signaling by EGF, basic fibroblast growth factor, insulin-like growth factor-1, and phorbol 12-myristate 13-acetate. The effect of CGP77675 on bone resorption was evaluated in vitro and in vivo. The parathyroid hormone-induced bone resorption in rat fetal long bone cultures was inhibited with an IC50 of 0.8 micromol/L. CGP77675 dose-dependently reduced the hypercalcemia induced in mice by interleukin-1beta and partly prevented bone loss and microarchitectural changes in young ovariectomized rats, showing that the protective effect on bone was exerted via the inhibition of bone resorption. Thus, specific Src family kinase inhibitors may be useful for the treatment of diseases associated with elevated bone loss.
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Affiliation(s)
- M Missbach
- Research Bone Metabolism, Novartis Pharma AG, Basel, Switzerland
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Van Oost J, Feyen J, Opheide J. Compartment syndrome associated with an osteocartilaginous exostosis. Acta Orthop Belg 1996; 62:233-5. [PMID: 9008968] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The authors describe a compartment syndrome of the deep posterior flexor compartment due to perforation of the popliteal artery by an osteocartilaginous exostosis, in a healthy 13-year-old boy. The difficulties in making the diagnosis are discussed. In a review of the literature regarding this condition, the combination of compartment syndrome and exostoses could not be found.
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Affiliation(s)
- J Van Oost
- Department of Orthopedic Surgery, St. Dymphna Hospital, Geel Belgium
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Hausmann S, Law FM, Bonjour JP, Feyen J, Rizzoli R. Regulation of parathyroid hormone/parathyroid hormone-related protein receptor expression by osteoblast-deposited extracellular matrix in a human osteoblast-like cell line. J Cell Physiol 1995; 165:164-71. [PMID: 7559797 DOI: 10.1002/jcp.1041650119] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Parathyroid hormone (PTH) receptors and the biological response to PTH in osteoblasts have been shown to be influenced by glucocorticoids, growth factors, cytokines or PTH itself. Furthermore, components of extracellular matrix (ECM) appear to regulate the response to PTH as well. We investigated the effects of osteoblast-deposited ECM on PTH-related protein (PTHrP)-stimulated cAMP production, PTHrP binding and PTH/PTHrP receptor mRNA in the human osteoblast-like cell line SaOS-2. ECM was laid down by the human osteoblastic cell line MG-63. At confluence, maximal cAMP stimulation induced by 100 nmol/l PTHrP (1-34) was decreased in SaOS-2 cells grown on ECM as compared with cultures on plastic dishes, without any change in PTHrP concentration producing half-maximal stimulation. In contrast, cAMP production stimulated by PGE2 was increased in cells on ECM. Saturable 125I-PTHrP binding (as evaluated by Scatchard plot analysis) was markedly diminished in cells grown on ECM (5,600 +/- 2,010 vs. 20,700 +/- 1,710 binding sites/cell, x +/- S.E.M., P < 0.01, n = 4 experiments), without any significant change in affinity (1.3 +/- 0.4 vs. 2.5 +/- 0.5 nmol/l (NS), in cells on ECM and plastic, respectively). This apparent decrease in membrane receptor density was associated with markedly lower steady state PTH/PTHrP receptor mRNA levels as assessed by Northern blot analysis (ECM/control: 0.4 +/- 0.1). A difference in PTH/PTHrP receptor mRNA levels between cells on ECM or on plastic dishes was detectable by 8 hours but not by 4 hours, after seeding the cells at high density. By 24 hours after plating, PTH/PTHrP receptor mRNA levels were maximally decreased in cells on ECM. These results in the human osteoblast-like cell line SaOS-2 indicate that PTH/PTHrP receptors are down-regulated by growth on ECM. Thus, attachment of bone cells to bone surface could influence differentiation and function of osteoblasts.
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Affiliation(s)
- S Hausmann
- Department of Medicine, University Hospital, Geneva, Switzerland
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van der Vliet JA, Bonthuis F, Marquet RL, Feyen J. Toward a new device for islet cell immunoisolation in pancreatic transplantation. Transplant Proc 1992; 24:955. [PMID: 1604682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- J A van der Vliet
- Department of Surgery, Universities of Nijmegen, Rotterdam, The Netherlands
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Abstract
A review is given of the development of the concept of an artificial tympanic membrane. Starting with homologous tympanic membranes we compared biodegradable collagen materials (homologous and heterologous) and biodegradable synthetic materials, poly-glycolic acid, poly-lactic acid and poly-alpha-amino acids. As a non-degradable material microporous PTFE and bisphenol-A poly (carbonate) were investigated. It is concluded that either poly-alpha-amino acid or PTFE with poly-alpha-amino acid maybe a suitable material for an artificial tympanic membrane.
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Feyen J, Libbrecht P, Fabry G. Adductor myotomy, hamstring lengthening and Achilles tendon lengthening in cerebral palsy. Acta Orthop Belg 1984; 50:180-9. [PMID: 6741502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Feyen J, Martens M, Mulier JC. Infection of the knee joint with Mycobacterium xenopi. Clin Orthop Relat Res 1983:189-90. [PMID: 6617014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Mycobacterium xenopi infection of the knee joint occurred in a 71-year-old man. Owing to the failure to recognize the "contaminant" initially as a possible etiologic agent, the joint was destroyed and eventually treated by arthrodesis.
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Dhondt W, Feyen J, Hoogmartens M. Combined use of the Craig needle and the arthroscopic biopsy forceps for closed biopsy of the spine. Acta Orthop Belg 1982; 48:897-9. [PMID: 7164806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Feyen J, Kerschbaum T. ["Simple" prosthetic case: the small mandibular bridge]. Zahnarztl Mitt 1980; 70:1100-5. [PMID: 7015725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Feyen J, de Groot K, de Visser AC, Bantjes A. Poly( -p-nitrobenzyl-L-glutamate): synthetic aspects, sedimentation, and viscosity studies. Biopolymers 1971; 10:2509-23. [PMID: 5126522 DOI: 10.1002/bip.360101212] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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