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Peyraut A, Genet M. A model of mechanical loading of the lungs including gravity and a balancing heterogeneous pleural pressure. Biomech Model Mechanobiol 2024:10.1007/s10237-024-01876-w. [PMID: 39368052 DOI: 10.1007/s10237-024-01876-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Accepted: 07/12/2024] [Indexed: 10/07/2024]
Abstract
Recent years have seen the development of multiple in silico lung models, notably with the aim of improving patient care for pulmonary diseases. These models vary in complexity and typically only consider the implementation of pleural pressure, a depression that keeps the lungs inflated. Gravity, often considered negligible compared to pleural pressure, has been largely overlooked, also due to the complexity of formulating physiological boundary conditions to counterbalance it. However, gravity is known to affect pulmonary functions, such as ventilation. In this study, we incorporated gravity into a recent lung poromechanical model. To do so, in addition to the gravitational body force, we proposed novel boundary conditions consisting in a heterogeneous pleural pressure field constrained to counterbalance gravity to reach global equilibrium of applied forces. We assessed the impact of gravity on the global and local behavior of the model, including the pressure-volume response and porosity field. Our findings reveal that gravity, despite being small, influences lung response. Specifically, the inclusion of gravity in our model led to the emergence of heterogeneities in deformation and stress distribution, compatible with in vivo imaging data. This could provide valuable insights for predicting the progression of certain pulmonary diseases by correlating areas subjected to higher deformation and stresses with disease evolution patterns.
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Affiliation(s)
- Alice Peyraut
- Solid Mechanics Laboratory, École Polytechnique/IPP/CNRS, Palaiseau, France
- MΞDISIM Team, INRIA, Palaiseau, France
| | - Martin Genet
- Solid Mechanics Laboratory, École Polytechnique/IPP/CNRS, Palaiseau, France.
- MΞDISIM Team, INRIA, Palaiseau, France.
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Mišík O, Kejíková J, Cejpek O, Malý M, Jugl A, Bělka M, Mravec F, Lízal F. Nebulization and In Vitro Upper Airway Deposition of Liposomal Carrier Systems. Mol Pharm 2024; 21:1848-1860. [PMID: 38466817 PMCID: PMC10988550 DOI: 10.1021/acs.molpharmaceut.3c01146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 02/29/2024] [Accepted: 03/01/2024] [Indexed: 03/13/2024]
Abstract
Liposomal carrier systems have emerged as a promising technology for pulmonary drug delivery. This study focuses on two selected liposomal systems, namely, dipalmitoylphosphatidylcholine stabilized by phosphatidic acid and cholesterol (DPPC-PA-Chol) and dipalmitoylphosphatidylcholine stabilized by polyethylene glycol and cholesterol (DPPC-PEG-Chol). First, the research investigates the stability of these liposomal systems during the atomization process using different kinds of nebulizers (air-jet, vibrating mesh, and ultrasonic). The study further explores the aerodynamic particle size distribution of the aerosol generated by the nebulizers. The nebulizer that demonstrated optimal stability and particle size was selected for more detailed investigation, including Andersen cascade impactor measurements, an assessment of the influence of flow rate and breathing profiles on aerosol particle size, and an in vitro deposition study on a realistic replica of the upper airways. The most suitable combination of a nebulizer and liposomal system was DPPC-PA-Chol nebulized by a Pari LC Sprint Star in terms of stability and particle size. The influence of the inspiration flow rate on the particle size was not very strong but was not negligible either (decrease of Dv50 by 1.34 μm with the flow rate increase from 8 to 60 L/min). A similar effect was observed for realistic transient inhalation. According to the in vitro deposition measurement, approximately 90% and 70% of the aerosol penetrated downstream of the trachea using the stationary flow rate and the realistic breathing profile, respectively. These data provide an image of the potential applicability of liposomal carrier systems for nebulizer therapy. Regional lung drug deposition is patient-specific; therefore, deposition results might vary for different airway geometries. However, deposition measurement with realistic boundary conditions (airway geometry, breathing profile) brings a more realistic image of the drug delivery by the selected technology. Our results show how much data from cascade impactor testing or estimates from the fine fraction concept differ from those of a more realistic case.
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Affiliation(s)
- Ondrej Mišík
- Department
of Thermodynamics and Environmental Engineering, Faculty of Mechanical
Engineering, Brno University of Technology, Technicka 2896/2, 616 69 Brno, Czech Republic
| | - Jana Kejíková
- Institute
of Physical and Applied Chemistry, Faculty of Chemistry, Brno University of Technology, Purkyňova 464/118, Královo Pole, 612 00 Brno, Czech Republic
| | - Ondřej Cejpek
- Department
of Thermodynamics and Environmental Engineering, Faculty of Mechanical
Engineering, Brno University of Technology, Technicka 2896/2, 616 69 Brno, Czech Republic
| | - Milan Malý
- Department
of Thermodynamics and Environmental Engineering, Faculty of Mechanical
Engineering, Brno University of Technology, Technicka 2896/2, 616 69 Brno, Czech Republic
| | - Adam Jugl
- Institute
of Physical and Applied Chemistry, Faculty of Chemistry, Brno University of Technology, Purkyňova 464/118, Královo Pole, 612 00 Brno, Czech Republic
| | - Miloslav Bělka
- Department
of Thermodynamics and Environmental Engineering, Faculty of Mechanical
Engineering, Brno University of Technology, Technicka 2896/2, 616 69 Brno, Czech Republic
| | - Filip Mravec
- Institute
of Physical and Applied Chemistry, Faculty of Chemistry, Brno University of Technology, Purkyňova 464/118, Královo Pole, 612 00 Brno, Czech Republic
| | - František Lízal
- Department
of Thermodynamics and Environmental Engineering, Faculty of Mechanical
Engineering, Brno University of Technology, Technicka 2896/2, 616 69 Brno, Czech Republic
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Kaul H. Multiscale computational modeling offers key to understanding molecular logic underpinning development and disease. Biotechniques 2023; 74:282-285. [PMID: 37326337 DOI: 10.2144/btn-2023-0039] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023] Open
Affiliation(s)
- Himanshu Kaul
- University of Leicester, School of Engineering, Leicester, LE1 7RH, UK
- Department of Respiratory Sciences, University of Leicester, Leicester, LE1 9HN, UK
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Safarlou CW, Jongsma KR, Vermeulen R, Bredenoord AL. The ethical aspects of exposome research: a systematic review. EXPOSOME 2023; 3:osad004. [PMID: 37745046 PMCID: PMC7615114 DOI: 10.1093/exposome/osad004] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
In recent years, exposome research has been put forward as the next frontier for the study of human health and disease. Exposome research entails the analysis of the totality of environmental exposures and their corresponding biological responses within the human body. Increasingly, this is operationalized by big-data approaches to map the effects of internal as well as external exposures using smart sensors and multiomics technologies. However, the ethical implications of exposome research are still only rarely discussed in the literature. Therefore, we conducted a systematic review of the academic literature regarding both the exposome and underlying research fields and approaches, to map the ethical aspects that are relevant to exposome research. We identify five ethical themes that are prominent in ethics discussions: the goals of exposome research, its standards, its tools, how it relates to study participants, and the consequences of its products. Furthermore, we provide a number of general principles for how future ethics research can best make use of our comprehensive overview of the ethical aspects of exposome research. Lastly, we highlight three aspects of exposome research that are most in need of ethical reflection: the actionability of its findings, the epidemiological or clinical norms applicable to exposome research, and the meaning and action-implications of bias.
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Affiliation(s)
- Caspar W. Safarlou
- Department of Global Public Health and Bioethics, Julius Center for
Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The
Netherlands
| | - Karin R. Jongsma
- Department of Global Public Health and Bioethics, Julius Center for
Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The
Netherlands
| | - Roel Vermeulen
- Department of Global Public Health and Bioethics, Julius Center for
Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The
Netherlands
- Department of Population Health Sciences, Utrecht University,
Utrecht, The Netherlands
| | - Annelien L. Bredenoord
- Department of Global Public Health and Bioethics, Julius Center for
Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The
Netherlands
- Erasmus School of Philosophy, Erasmus University Rotterdam,
Rotterdam, The Netherlands
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Virtual cells in a virtual microenvironment recapitulate early development-like patterns in human pluripotent stem cell colonies. Stem Cell Reports 2022; 18:377-393. [PMID: 36332630 PMCID: PMC9859929 DOI: 10.1016/j.stemcr.2022.10.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 10/04/2022] [Accepted: 10/06/2022] [Indexed: 11/06/2022] Open
Abstract
The mechanism by which morphogenetic signals engage the regulatory networks responsible for early embryonic tissue patterning is incompletely understood. Here, we developed a minimal gene regulatory network (GRN) model of human pluripotent stem cell (hPSC) lineage commitment and embedded it into "cellular" agents that respond to a dynamic morphogenetic signaling microenvironment. Simulations demonstrated that GRN wiring had significant non-intuitive effects on tissue pattern order, composition, and dynamics. Experimental perturbation of GRN connectivities supported model predictions and demonstrated the role of OCT4 as a master regulator of peri-gastrulation fates. Our so-called GARMEN strategy provides a multiscale computational platform to understand how single-cell-based regulatory interactions scale to tissue domains. This foundation provides new opportunities to simulate the impact of network motifs on normal and aberrant tissue development.
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A quasi-static poromechanical model of the lungs. Biomech Model Mechanobiol 2022; 21:527-551. [DOI: 10.1007/s10237-021-01547-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 12/09/2021] [Indexed: 11/02/2022]
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