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Aalders J, Léger L, Hassannia B, Goossens V, Vanden Berghe T, van Hengel J. Improving cardiac differentiation of human pluripotent stem cells by targeting ferroptosis. Regen Ther 2024; 27:21-31. [PMID: 38496011 PMCID: PMC10940893 DOI: 10.1016/j.reth.2024.02.007] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 02/08/2024] [Accepted: 02/25/2024] [Indexed: 03/19/2024] Open
Abstract
Generation of cardiomyocytes from human pluripotent stem cells (hPSCs) is of high interest for disease modelling and regenerative medicine. hPSCs can provide an unlimited source of patient-specific cardiomyocytes that are otherwise difficult to obtain from individuals. Moreover, the low proliferation rate of adult cardiomyocytes and low viability ex vivo limits the quantity of study material. Most protocols for the differentiation of cardiomyocytes from hPSCs are based on the temporal modulation of the Wnt pathway. However, during the initial stage of GSK-3 inhibition, a substantial number of cells are lost due to detachment. In this study, we aimed to increase the efficiency of generating cardiomyocytes from hPSCs. We identified cell death as a detrimental factor during this initial stage of in vitro cardiomyocyte differentiation. Through pharmacological targeting of different types of cell death, we discovered that ferroptosis was the main cell death type during the first 48 h of the in vitro differentiation procedure. Inhibiting ferroptosis using ferrostatin-1 during cardiomyocyte differentiation resulted in increased robustness and cell yield.
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Affiliation(s)
- Jeffrey Aalders
- Medical Cell Biology Research Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, Entrance 37a, 2nd floor, 9000, Ghent, Belgium
| | - Laurens Léger
- Medical Cell Biology Research Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, Entrance 37a, 2nd floor, 9000, Ghent, Belgium
| | - Behrouz Hassannia
- Cell Death Signalling Lab, Department of Biomedical Sciences, University of Antwerp, 2610 Antwerp, Belgium
| | | | - Tom Vanden Berghe
- Cell Death Signalling Lab, Department of Biomedical Sciences, University of Antwerp, 2610 Antwerp, Belgium
- Department of Biomedical Molecular Biology, Ghent University, 9000 Ghent, Belgium
- VIB-UGent Center for Inflammation Research, 9052 Ghent, Belgium
| | - Jolanda van Hengel
- Medical Cell Biology Research Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, Entrance 37a, 2nd floor, 9000, Ghent, Belgium
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Léger L, De Clercq C, Aalders J, Van Acker-Verberckt K, Braeckmans K, van Hengel J. Photoporation-mediated spatial intracellular delivery of stem cell-derived cardiomyocytes. MethodsX 2024; 12:102548. [PMID: 38292311 PMCID: PMC10825475 DOI: 10.1016/j.mex.2024.102548] [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: 11/15/2023] [Accepted: 01/03/2024] [Indexed: 02/01/2024] Open
Abstract
Human induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) are promising candidates for disease modeling and therapeutic purposes, however, non-viral intracellular delivery in these cells remains challenging. Gold nanoparticle (AuNP)-sensitized photoporation creates transient pores in the cell membrane by vapor nanobubble formation, allowing diffusion of extracellular biomolecules. This non-viral technique was employed to test and optimize its distinct physical mode of action in iPSC-CMs. Photoporation optimization was aimed at achieving high delivery rates while minimizing cell death. Various AuNP concentrations, in conjunction with different laser fluences, were explored to facilitate the intracellular delivery of 10 kDa and 150 kDa FITC-labelled dextran as model macromolecules. Cardiomyocyte viability was assessed using the CellTiter-Glo® viability assay, while the delivery efficiency was quantified through flow cytometry. On 30 day-old cardiomyocytes, AuNP photoporation was able to yield ∼60 % delivery efficiency while maintaining a high cell viability (∼70 %). Overall, higher AuNP concentrations resulted in greater delivery efficiencies, albeit at the expense of lower cell viability. Finally, photoporation was capable of patterning a geometric shape, demonstrating its exceptional selective resolution in delivering molecules to spatially restricted regions of the cell culture. In conclusion, AuNP-photoporation exhibits considerable potential as an effective and gentle non-viral method for intracellular delivery in iPSC-CMs.•AuNP-photoporation is a non-viral intracellular delivery method suitable for iPSC-CMs with high efficiency and cell viability•This method is capable of spatially resolved intracellular delivery with excellent resolution.
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Affiliation(s)
- Laurens Léger
- Medical Cell Biology Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Chloë De Clercq
- Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Jeffrey Aalders
- Medical Cell Biology Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Kiara Van Acker-Verberckt
- Medical Cell Biology Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Kevin Braeckmans
- Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Jolanda van Hengel
- Medical Cell Biology Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
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Aalders J, Léger L, Van der Meeren L, Sinha S, Skirtach AG, De Backer J, van Hengel J. Three-dimensional co-culturing of stem cell-derived cardiomyocytes and cardiac fibroblasts reveals a role for both cell types in Marfan-related cardiomyopathy. Matrix Biol 2024; 126:14-24. [PMID: 38224822 DOI: 10.1016/j.matbio.2024.01.003] [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: 08/10/2023] [Revised: 01/12/2024] [Accepted: 01/12/2024] [Indexed: 01/17/2024]
Abstract
Pathogenic variants in the FBN1 gene, which encodes the extracellular matrix protein fibrillin-1, cause Marfan syndrome (MFS), which affects multiple organ systems, including the cardiovascular system. Myocardial dysfunction has been observed in a subset of patients with MFS and in several MFS mouse models. However, there is limited understanding of the intrinsic consequences of FBN1 variants on cardiomyocytes (CMs). To elucidate the CM-specific contribution in Marfan's cardiomyopathy, cardiosphere cultures of CMs and cardiac fibroblasts (CFs) are used. CMs and CFs were derived by human induced pluripotent stem cell (iPSC) differentiation from MFS iPSCs with a pathogenic variant in FBN1 (c.3725G>A; p.Cys1242Tyr) and the corresponding CRISPR-corrected iPSC line (Cor). Cardiospheres containing MFS CMs show decreased FBN1, COL1A2 and GJA1 expression. MFS CMs cultured in cardiospheres have fewer binucleated CMs in comparison with Cor CMs. 13% of MFS CMs in cardiospheres are binucleated and 15% and 16% in cardiospheres that contain co-cultures with respectively MFS CFs and Cor CFs, compared to Cor CMs, that revealed up to 23% binucleation when co-cultured with CFs. The sarcomere length of CMs, as a marker of development, is significantly increased in MFS CMs interacting with Cor CF or MFS CF, as compared to monocultured MFS CMs. Nuclear blebbing was significantly more frequent in MFS CFs, which correlated with increased stiffness of the nuclear area compared to Cor CFs. Our cardiosphere model for Marfan-related cardiomyopathy identified a contribution of CFs in Marfan-related cardiomyopathy and suggests that abnormal early development of CMs may play a role in the disease mechanism.
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Affiliation(s)
- Jeffrey Aalders
- Medical Cell Biology Research Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Laurens Léger
- Medical Cell Biology Research Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Louis Van der Meeren
- Department of Biotechnology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Sanjay Sinha
- Wellcome-MRC Cambridge Stem Cell Institute, University of Cambridge, Cambridge, UK
| | - Andre G Skirtach
- Department of Biotechnology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Julie De Backer
- Centre for Medical Genetics, Ghent University Hospital, Belgium and Department of Biomolecular Medicine, Ghent University, Ghent, Belgium; Department of Cardiology, Ghent University Hospital, Ghent, Belgium
| | - Jolanda van Hengel
- Medical Cell Biology Research Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium.
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Aalders J, Léger L, Demolder A, Muiño Mosquera L, Coucke P, Menten B, De Backer J, van Hengel J. Generation of human induced pluripotent stem cell line UGENTi001-A from a patient with Marfan syndrome carrying a heterozygous c.7754 T > C variant in FBN1 and the isogenic control UGENT001-A-1 using CRISPR/Cas9 editing. Stem Cell Res 2023; 67:103036. [PMID: 36724552 DOI: 10.1016/j.scr.2023.103036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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] [Received: 01/13/2023] [Accepted: 01/24/2023] [Indexed: 01/26/2023] Open
Abstract
Marfan syndrome is an autosomal dominant genetic disorder resulting from pathogenic variants in FBN1 gene. FBN1 encodes for fibrillin-1, an important extracellular matrix protein. Impaired fibrillin-1 affects multiple organ systems, including the cardiovascular system. We generated an iPSC line carrying a heterozygous variant c.7754 T > C (p.Ile2585Thr, missense) in FBN1 from a patient with Marfan syndrome. Also, an isogenic control is generated, where the pathogenic variant is repaired using CRISPR-Cas9. This isogenic pair provides a valuable resource for in vitro disease modelling.
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Affiliation(s)
- Jeffrey Aalders
- Medical Cell Biology Research Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, Building B, Entrance 36, 9000 Ghent, Belgium
| | - Laurens Léger
- Medical Cell Biology Research Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, Building B, Entrance 36, 9000 Ghent, Belgium
| | - Anthony Demolder
- Center for Medical Genetics, Ghent University Hospital, Belgium and Department of Biomolecular Medicine, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium
| | - Laura Muiño Mosquera
- Center for Medical Genetics, Ghent University Hospital, Belgium and Department of Biomolecular Medicine, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium; Department of Paediatrics, Division of Paediatric Cardiology, Ghent University Hospital, 9000 Ghent, Belgium
| | - Paul Coucke
- Center for Medical Genetics, Ghent University Hospital, Belgium and Department of Biomolecular Medicine, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium
| | - Björn Menten
- Center for Medical Genetics, Ghent University Hospital, Belgium and Department of Biomolecular Medicine, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium
| | - Julie De Backer
- Center for Medical Genetics, Ghent University Hospital, Belgium and Department of Biomolecular Medicine, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium; Department of Cardiology, Ghent University Hospital, 9000 Ghent, Belgium
| | - Jolanda van Hengel
- Medical Cell Biology Research Group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, Building B, Entrance 36, 9000 Ghent, Belgium.
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Xiong R, Hua D, Van Hoeck J, Berdecka D, Léger L, De Munter S, Fraire JC, Raes L, Harizaj A, Sauvage F, Goetgeluk G, Pille M, Aalders J, Belza J, Van Acker T, Bolea-Fernandez E, Si T, Vanhaecke F, De Vos WH, Vandekerckhove B, van Hengel J, Raemdonck K, Huang C, De Smedt SC, Braeckmans K. Photothermal nanofibres enable safe engineering of therapeutic cells. Nat Nanotechnol 2021; 16:1281-1291. [PMID: 34675410 PMCID: PMC7612007 DOI: 10.1038/s41565-021-00976-3] [Citation(s) in RCA: 121] [Impact Index Per Article: 40.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 08/03/2021] [Indexed: 05/18/2023]
Abstract
Nanoparticle-sensitized photoporation is an upcoming approach for the intracellular delivery of biologics, combining high efficiency and throughput with excellent cell viability. However, as it relies on close contact between nanoparticles and cells, its translation towards clinical applications is hampered by safety and regulatory concerns. Here we show that light-sensitive iron oxide nanoparticles embedded in biocompatible electrospun nanofibres induce membrane permeabilization by photothermal effects without direct cellular contact with the nanoparticles. The photothermal nanofibres have been successfully used to deliver effector molecules, including CRISPR-Cas9 ribonucleoprotein complexes and short interfering RNA, to adherent and suspension cells, including embryonic stem cells and hard-to-transfect T cells, without affecting cell proliferation or phenotype. In vivo experiments furthermore demonstrated successful tumour regression in mice treated with chimeric antibody receptor T cells in which the expression of programmed cell death protein 1 (PD1) is downregulated after nanofibre photoporation with short interfering RNA to PD1. In conclusion, cell membrane permeabilization with photothermal nanofibres is a promising concept towards the safe and more efficient production of engineered cells for therapeutic applications, including stem cell or adoptive T cell therapy.
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Affiliation(s)
- Ranhua Xiong
- Joint Laboratory of Advanced Biomedical Materials (Nanjing Forestry University-Ghent University), International Innovation for Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing, People's Republic of China.
- Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium.
| | - Dawei Hua
- Joint Laboratory of Advanced Biomedical Materials (Nanjing Forestry University-Ghent University), International Innovation for Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing, People's Republic of China
- Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Jelter Van Hoeck
- Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Dominika Berdecka
- Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences, University of Antwerp, Antwerp, Belgium
| | - Laurens Léger
- Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Stijn De Munter
- Department of Diagnostic Sciences and Cancer Research Institute Ghent, Ghent University, Ghent, Belgium
| | - Juan C Fraire
- Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Laurens Raes
- Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Aranit Harizaj
- Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Félix Sauvage
- Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Glenn Goetgeluk
- Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Melissa Pille
- Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Jeffrey Aalders
- Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Joke Belza
- Department of Chemistry, Atomic and Mass Spectrometry Research Group, Ghent University, Ghent, Belgium
| | - Thibaut Van Acker
- Department of Chemistry, Atomic and Mass Spectrometry Research Group, Ghent University, Ghent, Belgium
| | - Eduardo Bolea-Fernandez
- Department of Chemistry, Atomic and Mass Spectrometry Research Group, Ghent University, Ghent, Belgium
| | - Ting Si
- Department of Modern Mechanics, University of Science and Technology of China, Hefei, People's Republic of China
| | - Frank Vanhaecke
- Department of Chemistry, Atomic and Mass Spectrometry Research Group, Ghent University, Ghent, Belgium
| | - Winnok H De Vos
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences, University of Antwerp, Antwerp, Belgium
| | - Bart Vandekerckhove
- Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Jolanda van Hengel
- Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Koen Raemdonck
- Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Chaobo Huang
- Joint Laboratory of Advanced Biomedical Materials (Nanjing Forestry University-Ghent University), International Innovation for Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing, People's Republic of China.
| | - Stefaan C De Smedt
- Joint Laboratory of Advanced Biomedical Materials (Nanjing Forestry University-Ghent University), International Innovation for Center for Forest Chemicals and Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing, People's Republic of China.
- Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium.
- Center for Advanced Light Microscopy, Ghent University, Ghent, Belgium.
| | - Kevin Braeckmans
- Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium.
- Center for Advanced Light Microscopy, Ghent University, Ghent, Belgium.
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Aalders J, Léger L, Tuerlings T, Ledda S, van Hengel J. Liquid marble technology to create cost-effective 3D cardiospheres as a platform for in vitro drug testing and disease modelling. MethodsX 2020; 7:101065. [PMID: 33005571 PMCID: PMC7509398 DOI: 10.1016/j.mex.2020.101065] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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] [Received: 07/10/2020] [Accepted: 09/09/2020] [Indexed: 01/28/2023] Open
Abstract
Three-dimensional (3D) cell culturing has several advantages over 2D cultures. 3D cell cultures more accurately mimic the in vivo environment, which is vital to obtain reliable results in disease modelling and toxicity testing. With the introduction of the Yamanaka factors, reprogramming of somatic cells to induced pluripotent stem cells (iPSCs) became available. This iPSC technology provides a scalable source of differentiated cells. iPSCs can be programmed to differentiate into any cell type of the body, including cardiomyocytes. These heart-specific muscle cells, can then serve as a model for therapeutic drug screening or assay development. Current methods to achieve multicellular spheroids by 3D cell cultures, such as hanging drop and spinner flasks are expensive, time-consuming and require specialized materials and training. Hydrophobic powders can be used to create a micro environment for cell cultures, which are termed liquid marbles (LM). In this procedure we describe the first use of the LM technology for 3D culturing in vitro derived human cardiomyocytes which results in the formation of cardiospheres within 24h. The cardiospheres could be used for several in depth and high-throughput analyses.
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Affiliation(s)
- Jeffrey Aalders
- Medical Cell Biology research group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, Building B, Entrance 36, 9000 Ghent, Belgium
| | - Laurens Léger
- Medical Cell Biology research group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, Building B, Entrance 36, 9000 Ghent, Belgium
| | - Tim Tuerlings
- Medical Cell Biology research group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, Building B, Entrance 36, 9000 Ghent, Belgium
| | - Sergio Ledda
- Department of Veterinary Medicine, University of Sassari, Sassari, Italy
| | - Jolanda van Hengel
- Medical Cell Biology research group, Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, Building B, Entrance 36, 9000 Ghent, Belgium
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Aalders J, Hartman E, Nefs G, Nieuwesteeg A, Hendrieckx C, Aanstoot H, Winterdijk P, van Mil E, Speight J, Pouwer F. Mindfulness and fear of hypoglycaemia in parents of children with Type 1 diabetes: results from Diabetes MILES Youth - The Netherlands. Diabet Med 2018; 35:650-657. [PMID: 29385240 PMCID: PMC5947298 DOI: 10.1111/dme.13594] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/25/2018] [Indexed: 01/10/2023]
Abstract
AIMS To identify the sociodemographic and clinical correlates of fear of hypoglycaemia among parents of children (aged 4-18 years) with Type 1 diabetes and to examine the relationships between parental fear of hypoglycaemia, mindfulness and mindful parenting. METHODS Sociodemographic, self-reported clinical and psychological data were extracted from the cross-sectional Diabetes MILES Youth - The Netherlands dataset. Questionnaires included the Hypoglycaemia Fear Survey - Parent Worry (parental fear of hypoglycaemia), the Freiburg Mindfulness Inventory - Short version (mindfulness) and the Interpersonal Mindfulness in Parenting Scale (mindful parenting). RESULTS A total of 421 parents (359 mothers) participated. Hierarchical linear regression analyses showed that greater parental fear of hypoglycaemia was related to younger parental age, low educational level, non-Dutch nationality, more frequent blood glucose monitoring, and less general mindfulness. Adding mindful parenting to the model negated the previous contribution of general mindfulness. In this model, lower mindful parenting was related to greater parental fear of hypoglycaemia. In particular, parents with an increased ability to be less judgemental of themselves as parents and less reactive to emotions within parenting interactions reported less fear of hypoglycaemia. In total, 21% of the variance in parental fear of hypoglycaemia was explained. CONCLUSION Parental fear of hypoglycaemia was associated largely with parental characteristics, including non-modifiable sociodemographics (i.e. age, education, nationality) and modifiable psychological factors (i.e. mindful parenting). These findings suggest that it is important to further explore mindfulness-based interventions for parents to reduce fear of hypoglycaemia next to interventions to reduce hypoglycaemia.
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Affiliation(s)
- J. Aalders
- Department of Medical and Clinical PsychologyCenter of Research on Psychological and Somatic Dsorders (CoRPS)Tilburg UniversityTilburgThe Netherlands
| | - E. Hartman
- Department of Medical and Clinical PsychologyCenter of Research on Psychological and Somatic Dsorders (CoRPS)Tilburg UniversityTilburgThe Netherlands
| | - G. Nefs
- Department of Medical and Clinical PsychologyCenter of Research on Psychological and Somatic Dsorders (CoRPS)Tilburg UniversityTilburgThe Netherlands
- Diabeter Centre for Pediatric and Adolescent Diabetes Care and ResearchRotterdamThe Netherlands
- Department of Medical PsychologyRadboud University Medical CentreRadboud Institute for Health ScienceNijmegenThe Netherlands
| | - A. Nieuwesteeg
- Department of Medical and Clinical PsychologyCenter of Research on Psychological and Somatic Dsorders (CoRPS)Tilburg UniversityTilburgThe Netherlands
- Máxima Medical CentreVeldhovenThe Netherlands
| | - C. Hendrieckx
- School of PsychologyDeakin UniversityGeelong, MelbourneAustralia
- Australian Centre for Behavioural Research in DiabetesDiabetes VictoriaMelbourneAustralia
| | - H.‐J. Aanstoot
- Diabeter Centre for Pediatric and Adolescent Diabetes Care and ResearchRotterdamThe Netherlands
| | - P. Winterdijk
- Diabeter Centre for Pediatric and Adolescent Diabetes Care and ResearchRotterdamThe Netherlands
| | - E. van Mil
- Kidz&Ko, Jeroen Bosch Hospital‘s‐HertogenboschThe Netherlands
| | - J. Speight
- School of PsychologyDeakin UniversityGeelong, MelbourneAustralia
- Australian Centre for Behavioural Research in DiabetesDiabetes VictoriaMelbourneAustralia
- AHP ResearchHornchurchUK
- Department of PsychologyUniversity of Southern DenmarkOdenseDenmark
| | - F. Pouwer
- School of PsychologyDeakin UniversityGeelong, MelbourneAustralia
- Department of PsychologyUniversity of Southern DenmarkOdenseDenmark
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Aalders J, Ali S, de Jong TJ, Richardson MK. Assessing Teratogenicity from the Clustering of Abnormal Phenotypes in Individual Zebrafish Larvae. Zebrafish 2016; 13:511-522. [PMID: 27560445 DOI: 10.1089/zeb.2016.1284] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [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: 12/21/2022] Open
Abstract
In previous publications, we described the population incidence of abnormalities in zebrafish larvae exposed to toxicants. Here, we examine the phenomenon of clustering or co-occurrence of abnormalities in individual larva. Our aim is to see how this clustering can be used to assess the specificity and severity of teratogenic effect. A total of 11,214 surviving larvae, exposed continuously from 1 day postfertilization (dpf) to one of 60 toxicants, were scored at 5 dpf for the presence of eight different abnormal phenotypes. These were as follows: pericardial edema, yolk sac edema, dispersed melanocytes, bent tail, bent trunk, hypoplasia of Meckel's cartilage, hypoplasia of branchial arches, and uninflated swim bladder. For 43/60 compounds tested, there was a concentration-dependent increase in the severity score (number of different abnormalities per larva). Statistical analysis showed that abnormalities tended to cluster (i.e., to occur in the same larva) more often than expected by chance alone. Yolk sac edema and dispersed melanocytes show a relatively strong association with one another and were typically the first abnormalities to appear in single larvae as the concentration of compound was increased. By contrast, hypoplastic branchial arches and hypoplastic Meckel's cartilage were only frequently observed in the most severely affected larvae. We developed a metric of teratogenicity (TC3/8), which represents the concentration of a compound that produces, on average, 3/8 abnormalities per larva. On this basis, the most teratogenic compounds tested here are amitriptyline, chlorpromazine hydrochloride, and sodium dodecyl sulfate; the least teratogenic is ethanol. We find a strong correlation between TC3/8 and LC50 of the 43 compounds that showed teratogenic effects. When we examined the ratio of TC3/8 to LC50, benserazide hydrochloride, copper (II) nitrate trihydrate, and nicotine had the highest specific teratogenicity, while aconitine, hesperidin, and ouabain octahydrate had the lowest. We conclude that analyzing the clustering of abnormalities per larva can provide an enriched teratogenic dataset compared with simple measurement of the population frequency of abnormalities.
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Affiliation(s)
- Jeffrey Aalders
- 1 Sylvius Laboratory, Institute of Biology, Leiden University , Leiden, the Netherlands
| | - Shaukat Ali
- 2 Department of Zoology, the University of Azad Jammu and Kashmir , Muzaffarabad, Pakistan
| | - Tom J de Jong
- 1 Sylvius Laboratory, Institute of Biology, Leiden University , Leiden, the Netherlands
| | - Michael K Richardson
- 1 Sylvius Laboratory, Institute of Biology, Leiden University , Leiden, the Netherlands
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Abstract
The zebrafish larva is a promising whole-animal model for safety pharmacology, environmental risk assessment, and developmental toxicity. This model has been used for the high-throughput toxicity screening of various compounds. Our aim here is to identify possible phenotypic markers of teratogenicity in zebrafish embryos that could be used for the assaying compounds for reproductive toxicity. We have screened a panel of 60 water-soluble toxicants to examine their effects on zebrafish development. A total of 22,080 wild-type zebrafish larvae were raised in 250 μL defined buffer in 96-well plates at a plating density of one embryo per well. They were exposed for a 96-h period starting at 24 h post-fertilization. A logarithmic concentration series was used for range-finding, followed by a narrower geometric series for developmental toxicity assessment. A total of 9017 survivors were analyzed at 5 days post-fertilization for nine phenotypes, namely, (1) normal, (2) pericardial oedema, (3) yolk sac oedema, (4) melanophores dispersed, (5) bent tail tip, (6) bent body axis, (7) abnormal Meckel's cartilage, (8) abnormal branchial arches, and (9) uninflated swim bladder. For each toxicant, the EC50 (concentration required to produce one or more of these abnormalities in 50% of embryos) was also calculated. For the majority of toxicants (55/60) there was, at the population level, a statistically significant, concentration-dependent increase in the incidence of abnormal phenotypes among survivors. The commonest abnormalities were pericardial oedema, yolk sac oedema, dispersed melanophores, and uninflated swim bladder. It is possible therefore that these could prove to be general indicators of reproductive toxicity in the zebrafish embryo assay.
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Affiliation(s)
- Shaukat Ali
- 1 Sylvius Laboratory, Institute of Biology, Leiden University , Leiden, The Netherlands
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Onsrud M, Aalders J, Abeler V, Taylor P. Endometrial carcinoma with cervical involvement (stage II): prognostic factors and value of combined radiological-surgical treatment. Gynecol Oncol 1982; 13:76-86. [PMID: 7060995 DOI: 10.1016/0090-8258(82)90011-7] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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11
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Iversen T, Abeler V, Aalders J. Individualized treatment of stage I carcinoma of the vulva. Obstet Gynecol 1981; 57:85-9. [PMID: 7454180] [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] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A series of 117 patients with stage I squamous cell carcinoma of the vulva was followed for 3 to 21 years. Twenty recurrences (17.1%) were found, 12 in the vulva or vagina, 7 in the groin, and 1 in a patient who developed distant metastases. Invasion of tumor cells in lymph or blood vessels was found in operative specimens from 19 patients (16.2%), 8 of whom (42.1%) developed local recurrences of metastases. Of 76 patients who underwent lymphadenectomy, 7 had ipsilateral and 1 had bilateral metastases to the inguinal lymph nodes. Five-year crude survival rate for the whole series was 79%, but only 52% for the group of patients with vessel invasion. Treatment should in most cases be hemivulvectomy with ipsilateral inguinal lymphadenectomy.
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Aalders J, Abeler V, Kolstad P, Onsrud M. Postoperative external irradiation and prognostic parameters in stage I endometrial carcinoma: clinical and histopathologic study of 540 patients. Obstet Gynecol 1980; 56:419-27. [PMID: 6999399] [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] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
From 1968 to 1974, 540 patients with stage I adenocarcinoma of the corpus uteri entered a prospective clinical trial to evaluate the effect of postoperative external pelvic irradiation. After primary surgery all patients received intravaginal radium irradiation; 6000 rads was delivered to the surface of the vaginal mucosa. At the time vaginal radium was given, randomization was performed: Group A received no further treatment (controls); group B received additional high-voltage irradiation to the pelvic field with a dose of 4000 rads to the pelvic lymph nodes. During the follow-up period of 3 to 10 years a significant reduction in vaginal and pelvic recurrences was found in group B as compared with group A (1.9 versus 6.9%, P < .01). On the other hand, more patients in group B developed distant metastases than those in group A (9.9 versus 5.4%). Thus, the 5-year survival rate was not improved by external irradiation. A more detailed analysis of the series led to the conclusion that only patients with poorly differentiated tumors (grade 3), which infiltrate more than half the myometrial thickness, might benefit from additional external radiotherapy. In almost 20% of 151 consecutive patients, tumor cells were found in endothelial lined spaces. Significantly more deaths and recurrences were found among these patients compared to those without vessel invasion (26.7 versus 9.1%, P < .01).
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