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Lassi M, Tomar A, Comas-Armangué G, Vogtmann R, Dijkstra DJ, Corujo D, Gerlini R, Darr J, Scheid F, Rozman J, Aguilar-Pimentel A, Koren O, Buschbeck M, Fuchs H, Marschall S, Gailus-Durner V, Hrabe de Angelis M, Plösch T, Gellhaus A, Teperino R. Disruption of paternal circadian rhythm affects metabolic health in male offspring via nongerm cell factors. Sci Adv 2021; 7:7/22/eabg6424. [PMID: 34039610 PMCID: PMC8153725 DOI: 10.1126/sciadv.abg6424] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 04/02/2021] [Indexed: 06/12/2023]
Abstract
Circadian rhythm synchronizes each body function with the environment and regulates physiology. Disruption of normal circadian rhythm alters organismal physiology and increases disease risk. Recent epidemiological data and studies in model organisms have shown that maternal circadian disruption is important for offspring health and adult phenotypes. Less is known about the role of paternal circadian rhythm for offspring health. Here, we disrupted circadian rhythm in male mice by night-restricted feeding and showed that paternal circadian disruption at conception is important for offspring feeding behavior, metabolic health, and oscillatory transcription. Mechanistically, our data suggest that the effect of paternal circadian disruption is not transferred to the offspring via the germ cells but initiated by corticosterone-based parental communication at conception and programmed during in utero development through a state of fetal growth restriction. These findings indicate paternal circadian health at conception as a newly identified determinant of offspring phenotypes.
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Affiliation(s)
- Maximilian Lassi
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
| | - Archana Tomar
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
| | - Gemma Comas-Armangué
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
| | - Rebekka Vogtmann
- Department of Gynecology and Obstetrics-University Hospital Essen - Essen, Germany
| | - Dorieke J Dijkstra
- University of Groningen, University Medical Center Groningen, Department of Obstetrics and Gynecology, Groningen, Netherlands
| | - David Corujo
- Cancer and Leukemia Epigenetics and Biology Program, Josep Carreras Institute for Leukemia Research (IJC) Badalona, Spain
| | - Raffaele Gerlini
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
| | - Jonatan Darr
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
| | - Fabienne Scheid
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
| | - Jan Rozman
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50, Vestec, Czech Republic
| | - Antonio Aguilar-Pimentel
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
| | - Omry Koren
- Azrieli Faculty of Medicine, Bar Ilan University, Safed, Israel
| | - Marcus Buschbeck
- Cancer and Leukemia Epigenetics and Biology Program, Josep Carreras Institute for Leukemia Research (IJC) Badalona, Spain
- Program for Predictive and Personalized Medicine of Cancer, Germans Trias i Pujol Research Institute (PMPPC-IGTP), 08916 Badalona, Spain
| | - Helmut Fuchs
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
| | - Susan Marschall
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
| | - Valerie Gailus-Durner
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
| | - Martin Hrabe de Angelis
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- Chair of Experimental Genetics, School of Life Science Weihenstephan, Technische Universität München Freising, Germany
| | - Torsten Plösch
- University of Groningen, University Medical Center Groningen, Department of Obstetrics and Gynecology, Groningen, Netherlands
| | - Alexandra Gellhaus
- Department of Gynecology and Obstetrics-University Hospital Essen - Essen, Germany
| | - Raffaele Teperino
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany.
- German Center for Diabetes Research (DZD) Neuherberg, Germany
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Dijkstra DJ, Liem SIE, van Leeuwen NM, Fehres CM, de Vries-Bouwstra JK, Trouw LA. Anti-C1q autoantibodies may not serve as an adequate biomarker for lung manifestations in systemic sclerosis: a single-centre, cross-sectional study. Br J Dermatol 2021; 185:657-658. [PMID: 33913512 PMCID: PMC8453845 DOI: 10.1111/bjd.20412] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/19/2021] [Accepted: 04/23/2021] [Indexed: 12/04/2022]
Affiliation(s)
- D J Dijkstra
- Department of Immunology, Leiden University Medical Center, Leiden, the Netherlands
| | - S I E Liem
- Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
| | - N M van Leeuwen
- Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
| | - C M Fehres
- Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
| | - J K de Vries-Bouwstra
- Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
| | - L A Trouw
- Department of Immunology, Leiden University Medical Center, Leiden, the Netherlands
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3
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Dijkstra DJ, Verkaik-Schakel RN, Eskandar S, Limonciel A, Stojanovska V, Scherjon SA, Plösch T. Mid-gestation low-dose LPS administration results in female-specific excessive weight gain upon a western style diet in mouse offspring. Sci Rep 2020; 10:19618. [PMID: 33184349 PMCID: PMC7665071 DOI: 10.1038/s41598-020-76501-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 10/15/2020] [Indexed: 01/03/2023] Open
Abstract
Gestational complications, including preeclampsia and gestational diabetes, have long-term adverse consequences for offspring's metabolic and cardiovascular health. A low-grade systemic inflammatory response is likely mediating this. Here, we examine the consequences of LPS-induced gestational inflammation on offspring's health in adulthood. LPS was administered to pregnant C57Bl/6J mice on gestational day 10.5. Maternal plasma metabolomics showed oxidative stress, remaining for at least 5 days after LPS administration, likely mediating the consequences for the offspring. From weaning on, all offspring was fed a control diet; from 12 to 24 weeks of age, half of the offspring received a western-style diet (WSD). The combination of LPS-exposure and WSD resulted in hyperphagia and increased body weight and body fat mass in the female offspring. This was accompanied by changes in glucose tolerance, leptin and insulin levels and gene expression in liver and adipose tissue. In the hypothalamus, expression of genes involved in food intake regulation was slightly changed. We speculate that altered food intake behaviour is a result of dysregulation of hypothalamic signalling. Our results add to understanding of how maternal inflammation can mediate long-term health consequences for the offspring. This is relevant to many gestational complications with a pro-inflammatory reaction in place.
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Affiliation(s)
- Dorieke J Dijkstra
- Department of Obstetrics and Gynaecology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, CB22, 9713GZ, Groningen, The Netherlands
| | - Rikst Nynke Verkaik-Schakel
- Department of Obstetrics and Gynaecology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, CB22, 9713GZ, Groningen, The Netherlands
| | - Sharon Eskandar
- Department of Obstetrics and Gynaecology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, CB22, 9713GZ, Groningen, The Netherlands.,Section Molecular Neurobiology, Department of Biomedical Sciences of Cells and Systems, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | | | - Violeta Stojanovska
- Department of Environmental Immunology, Helmholtz Centre for Environmental Research, Leipzig, Germany
| | - Sicco A Scherjon
- Department of Obstetrics and Gynaecology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, CB22, 9713GZ, Groningen, The Netherlands
| | - Torsten Plösch
- Department of Obstetrics and Gynaecology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, CB22, 9713GZ, Groningen, The Netherlands. .,Perinatal Neurobiology, Department of Human Medicine, School of Medicine and Health Sciences Carl von Ossietzky University Oldenburg, Oldenburg, Germany.
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4
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Plösch T, Dijkstra DJ, Verkaik-Schakel RN, Stojanovska V, Scherjon SA. Mid‐gestation low‐dose LPS administration results in excessive weight gain upon a Western Style Diet in female mouse offspring. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.03887] [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: 11/11/2022]
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5
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Lubbers R, Oostindie SC, Dijkstra DJ, Parren PWHI, Verheul MK, Abendstein L, Sharp TH, de Ru A, Janssen GMC, van Veelen PA, van den Bremer ETJ, Bleijlevens B, de Kreuk BJ, Beurskens FJ, Trouw LA. Carbamylation reduces the capacity of IgG for hexamerization and complement activation. Clin Exp Immunol 2019; 200:1-11. [PMID: 31853959 PMCID: PMC7066385 DOI: 10.1111/cei.13411] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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] [Accepted: 12/11/2019] [Indexed: 02/06/2023] Open
Abstract
Carbamylation is a post‐translational modification that can be detected on a range of proteins, including immunoglobulin (Ig)G, in several clinical conditions. Carbamylated IgG (ca‐IgG) was reported to lose its capacity to trigger complement activation, but the mechanism remains unclear. Because C1q binds with high affinity to hexameric IgG, we analyzed whether carbamylation of IgG affects binding of C1q, hexamerization and complement‐dependent cytotoxicity (CDC). Synovial tissues of rheumatoid arthritis (RA) patients were analyzed for the presence of ca‐IgG in vivo. Synovial tissues from RA patients were analyzed for the presence of ca‐IgG using mass spectrometry (MS). Monomeric or hexameric antibodies were carbamylated in vitro and quality in solution was controlled. The capacity of ca‐IgG to activate complement was analyzed in enzyme‐linked immunosorbent (ELISAs) and cellular CDC assays. Using MS, we identified ca‐IgG to be present in the joints of RA patients. Using in vitro carbamylated antibodies, we observed that ca‐IgG lost its capacity to activate complement in both solid‐phase and CDC assays. Mixing ca‐IgG with non‐modified IgG did not result in effective inhibition of complement activation by ca‐IgG. Carbamylation of both monomeric IgG and preformed hexameric IgG greatly impaired the capacity to trigger complement activation. Furthermore, upon carbamylation, the preformed hexameric IgG dissociated into monomeric IgG in solution, indicating that carbamylation influences both hexamerization and C1q binding. In conclusion, ca‐IgG can be detected in vivo and has a strongly reduced capacity to activate complement which is, in part, mediated through a reduced ability to form hexamers.
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Affiliation(s)
- R Lubbers
- Department Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
| | - S C Oostindie
- Genmab, Utrecht, the Netherlands.,Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands
| | - D J Dijkstra
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands
| | - P W H I Parren
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands.,Lava Therapeutics, Utrecht, the Netherlands
| | - M K Verheul
- Department Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
| | - L Abendstein
- Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, the Netherlands
| | - T H Sharp
- Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, the Netherlands
| | - A de Ru
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, the Netherlands
| | - G M C Janssen
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, the Netherlands
| | - P A van Veelen
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, the Netherlands
| | | | | | | | | | - L A Trouw
- Department Rheumatology, Leiden University Medical Center, Leiden, the Netherlands.,Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands
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Plösch T, Dijkstra DJ, Stojanovska V, Verkaik‐Schakel RN, Scherjon SA. Maternal and Sex‐Specific Fetal Characteristics of Three Different Mouse Models for Fetal Programming by Preeclampsia. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.758.2] [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: 11/11/2022]
Affiliation(s)
- Torsten Plösch
- Obstetrics and GynecologyUniversity Medical Center GroningenGroningenNetherlands
| | - Dorieke J. Dijkstra
- Obstetrics and GynecologyUniversity Medical Center GroningenGroningenNetherlands
| | - Violeta Stojanovska
- Obstetrics and GynecologyUniversity Medical Center GroningenGroningenNetherlands
| | | | - Sicco A. Scherjon
- Obstetrics and GynecologyUniversity Medical Center GroningenGroningenNetherlands
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Stojanovska V, Dijkstra DJ, Vogtmann R, Gellhaus A, Scherjon SA, Plösch T. A double-hit pre-eclampsia model results in sex-specific growth restriction patterns. Dis Model Mech 2019; 12:dmm.035980. [PMID: 30683649 PMCID: PMC6398487 DOI: 10.1242/dmm.035980] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [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: 06/07/2018] [Accepted: 01/09/2019] [Indexed: 12/29/2022] Open
Abstract
Pre-eclampsia is a multifactorial pregnancy-associated disorder characterized by angiogenic dysbalance and systemic inflammation; however, animal models that combine these two pathophysiological conditions are missing. Here, we introduce a novel double-hit pre-eclampsia mouse model that mimics the complex multifactorial conditions present during pre-eclampsia and allows for the investigation of early consequences for the fetus. Adenoviral overexpression of soluble fms-like tyrosine kinase (sFlt-1) and lipopolysaccharide (LPS) administration at mid-gestation in pregnant mice resulted in hypertension and albuminuria comparable to that of the manifestation in humans. A metabolomics analysis revealed that pre-eclamptic dams have increased plasma concentrations of phosphadytilcholines. The fetuses of both sexes were growth restricted; however, in males a brain-sparing effect was seen as compensation for this growth restriction. According to the plasma metabolomics, male fetuses showed changes in amino acid metabolism, while female fetuses showed pronounced alterations in lipid metabolism. Our results show that combined exposure to sFlt-1 and LPS mimics the clinical symptoms of pre-eclampsia and affects fetal growth in a sex-specific manner, with accompanying metabolome changes.
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Affiliation(s)
- Violeta Stojanovska
- Department of Obstetrics and Gynecology, University Medical Center Groningen, University of Groningen, 9700RB Groningen, The Netherlands
| | - Dorieke J Dijkstra
- Department of Obstetrics and Gynecology, University Medical Center Groningen, University of Groningen, 9700RB Groningen, The Netherlands
| | - Rebekka Vogtmann
- Department of Gynecology and Obstetrics, University Hospital Duisburg-Essen, 45147 Essen, Germany
| | - Alexandra Gellhaus
- Department of Gynecology and Obstetrics, University Hospital Duisburg-Essen, 45147 Essen, Germany
| | - Sicco A Scherjon
- Department of Obstetrics and Gynecology, University Medical Center Groningen, University of Groningen, 9700RB Groningen, The Netherlands
| | - Torsten Plösch
- Department of Obstetrics and Gynecology, University Medical Center Groningen, University of Groningen, 9700RB Groningen, The Netherlands
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Stojanovska V, Dijkstra DJ, Vogtmann R, Gellhaus A, Scherjon SA, Plosch T. 202. Joint exposure to antiangiogenesis and inflammation in pregnant mice results in sex specific growth restriction patterns. Pregnancy Hypertens 2018. [DOI: 10.1016/j.preghy.2018.08.289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Stojanovska V, Sharma N, Dijkstra DJ, Scherjon SA, Jäger A, Schorle H, Plösch T. Placental insufficiency contributes to fatty acid metabolism alterations in aged female mouse offspring. Am J Physiol Regul Integr Comp Physiol 2018; 315:R1107-R1114. [PMID: 30207754 DOI: 10.1152/ajpregu.00420.2017] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Intrauterine growth restriction (IUGR) is an accepted risk factor for metabolic disorders in later life, including obesity and type 2 diabetes. The level of metabolic dysregulation can vary between subjects and is dependent on the severity and the type of IUGR insult. Classical IUGR animal models involve nutritional deprivation of the mother or uterine artery ligation. The latter aims to mimic a placental insufficiency, which is the most frequent cause of IUGR. In this study, we investigated whether IUGR attributable to placental insufficiency impacts the glucose and lipid homeostasis at advanced age. Placental insufficiency was achieved by deletion of the transcription factor AP-2y ( Tfap2c), which serves as one of the major trophoblast differentiation regulators. TdelT-IUGR mice were obtained by crossing mice with a floxed Tfap2c allele and mice with Cre recombinase under the control of the Tpbpa promoter. In advanced adulthood (9-12 mo), female and male IUGR mice are respectively 20% and 12% leaner compared with controls. At this age, IUGR mice have unaffected glucose clearance and lipid parameters (cholesterol, triglycerides, and phospholipids) in the liver. However, female IUGR mice have increased plasma free fatty acids (+87%) compared with controls. This is accompanied by increased mRNA levels of fatty acid synthase and endoplasmic reticulum stress markers in white adipose tissue. Taken together, our results suggest that IUGR by placental insufficiency may lead to higher lipogenesis in female mice in advanced adulthood, at least indicated by greater Fasn expression. This effect was sex specific for the aged IUGR females.
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Affiliation(s)
- Violeta Stojanovska
- Department of Obstetrics and Gynecology, University of Groningen, University Medical Center Groningen , Groningen , The Netherlands
| | - Neha Sharma
- Department of Developmental Pathology, Institute of Pathology, Bonn University Medical School , Bonn , Germany
| | - Dorieke J Dijkstra
- Department of Obstetrics and Gynecology, University of Groningen, University Medical Center Groningen , Groningen , The Netherlands
| | - Sicco A Scherjon
- Department of Obstetrics and Gynecology, University of Groningen, University Medical Center Groningen , Groningen , The Netherlands
| | - Andrea Jäger
- Department of Developmental Pathology, Institute of Pathology, Bonn University Medical School , Bonn , Germany
| | - Hubert Schorle
- Department of Developmental Pathology, Institute of Pathology, Bonn University Medical School , Bonn , Germany
| | - Torsten Plösch
- Department of Obstetrics and Gynecology, University of Groningen, University Medical Center Groningen , Groningen , The Netherlands
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Georgieva K, Dijkstra DJ, Fricke H, Willenbacher N. Clogging of microchannels by nano-particles due to hetero-coagulation in elongational flow. J Colloid Interface Sci 2010; 352:265-77. [PMID: 20851405 DOI: 10.1016/j.jcis.2010.08.065] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Revised: 08/23/2010] [Accepted: 08/25/2010] [Indexed: 10/19/2022]
Abstract
We have investigated the phenomenon of flow-induced aggregation in highly concentrated colloidal dispersions exposed to strongly converging flow fields. This phenomenon is relevant not only for classical technical operations like coating, pumping or filtration, but also for the application of concentrated suspensions in upcoming processing technologies based on microfluidic devices. A ring-slit device (gap height 10-25 μm), which allows for a variation of flow kinematics in a wide range, has been developed in order to investigate this phenomenon. Various polymer dispersions with different particle surface properties have been used as model systems. Our experiments exclude, that channel clogging is due to retention of pre-existing aggregates, fouling or hydrodynamic bridging. Instead, we demonstrate that clogging of the microchannel is induced by hetero-coagulation between primary colloidal particles and micron-sized impurities present at concentrations on the order of 100-1000 ppm. Clogging can occur even if the diameter of these impurities is less than a tenth of the gap height. Aggregation takes place in the converging flow field at the channel entrance, but not in the shear field within the slit. It can be suppressed by appropriate stabilization of the primary particles.
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Affiliation(s)
- K Georgieva
- Institute of Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany.
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11
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Affiliation(s)
- D J Dijkstra
- Department of Medical Genetics, University of Groningen, The Netherlands
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