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Hay Q, Pak E, Gardner L, Shaw A, Roger LM, Lewinski NA, Segal RA, Reynolds AM. A mathematical model for wound healing in the reef-building coral Pocillopora damicornis. J Theor Biol 2024; 593:111897. [PMID: 38971400 DOI: 10.1016/j.jtbi.2024.111897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 07/01/2024] [Accepted: 07/01/2024] [Indexed: 07/08/2024]
Abstract
Coral reefs, among the most diverse ecosystems on Earth, currently face major threats from pollution, unsustainable fishing practices , and perturbations in environmental parameters brought on by climate change. Corals also sustain regular wounding from other sea life and human activity. Recent reef restoration practices have even involved intentional wounding by systematically breaking coral fragments and relocating them to revitalize damaged reefs, a practice known as microfragmentation. Despite its importance, very little research has explored the inner mechanisms of wound healing in corals. Some reef-building corals have been observed to initiate an immunological response to wounding similar to that observed in mammalian species. Utilizing prior models of wound healing in mammalian species as the mathematical basis, we formulated a mechanistic model of wound healing, including observations of the immune response and tissue repair in scleractinian corals for the species Pocillopora damicornis. The model consists of four differential equations which track changes in remaining wound debris, number of cells involved in inflammation, number of cells involved in proliferation, and amount of wound closure through re-epithelialization. The model is fit to experimental wound size data from linear and circular shaped wounds on a live coral fragment. Mathematical methods, including numerical simulations and local sensitivity analysis, were used to analyze the resulting model. The parameter space was also explored to investigate drivers of other possible wound outcomes. This model serves as a first step in generating mathematical models for wound healing in corals that will not only aid in the understanding of wound healing as a whole, but also help optimize reef restoration practices and predict recovery behavior after major wounding events.
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Affiliation(s)
- Quintessa Hay
- Department of Mathematics & Applied Mathematics, Virginia Commonwealth University, Richmond, VA, USA
| | - Eunice Pak
- Department of Biomedical Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Luke Gardner
- Department of Mathematics & Applied Mathematics, Virginia Commonwealth University, Richmond, VA, USA
| | - Anna Shaw
- Department of Mathematics & Applied Mathematics, Virginia Commonwealth University, Richmond, VA, USA
| | - Liza M Roger
- Department of Chemical & Life Science Engineering, Virginia Commonwealth University, Richmond, VA, USA; School of Molecular Sciences, Arizona State University, Tempe, AZ, USA; School of Ocean Futures, Arizona State University, Tempe, AZ, USA
| | - Nastassja A Lewinski
- Department of Chemical & Life Science Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Rebecca A Segal
- Department of Mathematics & Applied Mathematics, Virginia Commonwealth University, Richmond, VA, USA
| | - Angela M Reynolds
- Department of Mathematics & Applied Mathematics, Virginia Commonwealth University, Richmond, VA, USA.
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2
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Almansour S, Dunster JL, Crofts JJ, Nelson MR. A systematic evaluation of the influence of macrophage phenotype descriptions on inflammatory dynamics. MATHEMATICAL MEDICINE AND BIOLOGY : A JOURNAL OF THE IMA 2024; 41:81-109. [PMID: 38604176 PMCID: PMC11258393 DOI: 10.1093/imammb/dqae004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 01/18/2024] [Accepted: 03/28/2024] [Indexed: 04/13/2024]
Abstract
Macrophages play a wide range of roles in resolving the inflammatory damage that underlies many medical conditions and have the ability to adopt different phenotypes in response to different environmental stimuli. Categorising macrophage phenotypes exactly is a difficult task, and there is disparity in the literature around the optimal nomenclature to describe these phenotypes; however, what is clear is that macrophages can exhibit both pro- and anti-inflammatory behaviours dependent upon their phenotype, rendering mathematical models of the inflammatory response potentially sensitive to their description of the macrophage populations that they incorporate. Many previous models of inflammation include a single macrophage population with both pro- and anti-inflammatory functions. Here, we build upon these existing models to include explicit descriptions of distinct macrophage phenotypes and examine the extent to which this influences the inflammatory dynamics that the models emit. We analyse our models via numerical simulation in MATLAB and dynamical systems analysis in XPPAUT, and show that models that account for distinct macrophage phenotypes separately can offer more realistic steady state solutions than precursor models do (better capturing the anti-inflammatory activity of tissue resident macrophages), as well as oscillatory dynamics not previously observed. Finally, we reflect on the conclusions of our analysis in the context of the ongoing hunt for potential new therapies for inflammatory conditions, highlighting manipulation of macrophage polarisation states as a potential therapeutic target.
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Affiliation(s)
- Suliman Almansour
- School of Science & Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK
| | - Joanne L Dunster
- Institute for Cardiovascular and Metabolic Research, University of Reading, Reading, RG6 6AS, UK
| | - Jonathan J Crofts
- School of Science & Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK
| | - Martin R Nelson
- School of Science & Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK
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3
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Shashikumar U, Saraswat A, Deshmukh K, Hussain CM, Chandra P, Tsai PC, Huang PC, Chen YH, Ke LY, Lin YC, Chawla S, Ponnusamy VK. Innovative technologies for the fabrication of 3D/4D smart hydrogels and its biomedical applications - A comprehensive review. Adv Colloid Interface Sci 2024; 328:103163. [PMID: 38749384 DOI: 10.1016/j.cis.2024.103163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 03/18/2024] [Accepted: 04/21/2024] [Indexed: 05/26/2024]
Abstract
Repairing and regenerating damaged tissues or organs, and restoring their functioning has been the ultimate aim of medical innovations. 'Reviving healthcare' blends tissue engineering with alternative techniques such as hydrogels, which have emerged as vital tools in modern medicine. Additive manufacturing (AM) is a practical manufacturing revolution that uses building strategies like molding as a viable solution for precise hydrogel manufacturing. Recent advances in this technology have led to the successful manufacturing of hydrogels with enhanced reproducibility, accuracy, precision, and ease of fabrication. Hydrogels continue to metamorphose as the vital compatible bio-ink matrix for AM. AM hydrogels have paved the way for complex 3D/4D hydrogels that can be loaded with drugs or cells. Bio-mimicking 3D cell cultures designed via hydrogel-based AM is a groundbreaking in-vivo assessment tool in biomedical trials. This brief review focuses on preparations and applications of additively manufactured hydrogels in the biomedical spectrum, such as targeted drug delivery, 3D-cell culture, numerous regenerative strategies, biosensing, bioprinting, and cancer therapies. Prevalent AM techniques like extrusion, inkjet, digital light processing, and stereo-lithography have been explored with their setup and methodology to yield functional hydrogels. The perspectives, limitations, and the possible prospects of AM hydrogels have been critically examined in this study.
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Affiliation(s)
- Uday Shashikumar
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University (KMU), Kaohsiung City 807, Taiwan
| | - Aditya Saraswat
- Department of Chemistry, Amity Institute of Applied Sciences, Amity University, Noida, UP, India
| | - Kalim Deshmukh
- New Technologies - Research Centre University of West Bohemia Univerzitní 2732/8, 30100, Plzeň, Czech Republic
| | - Chaudhery Mustansar Hussain
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102, United States
| | - Pranjal Chandra
- Laboratory of Bio-Physio Sensors and Nanobioengineering, School of Biochemical Engineering, Indian Institute of Technology (BHU) Varanasi, Uttar Pradesh, India
| | - Pei-Chien Tsai
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University (KMU), Kaohsiung City 807, Taiwan; Department of Computational Biology, Institute of Bioinformatics, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Chennai 602105, Tamil Nadu, India
| | - Po-Chin Huang
- National Institute of Environmental Health Sciences, National Health Research Institutes (NHRI), Miaoli County 35053, Taiwan; Research Center for Precision Environmental Medicine, Kaohsiung Medical University (KMU), Kaohsiung City 807, Taiwan; Department of Medical Research, China Medical University Hospital (CMUH), China Medical University (CMU), Taichung City, Taiwan
| | - Yi-Hsun Chen
- Division of Gastroenterology, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung City, Taiwan.
| | - Liang-Yin Ke
- Department of Medical Laboratory Science and Biotechnology, College of Health Sciences, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yuan-Chung Lin
- Institute of Environmental Engineering, National Sun Yat-sen University (NSYSU), Kaohsiung City 804, Taiwan; Center for Emerging Contaminants Research, National Sun Yat-sen University (NSYSU), Kaohsiung City 804, Taiwan.
| | - Shashi Chawla
- Department of Chemistry, Amity Institute of Applied Sciences, Amity University, Noida, UP, India.
| | - Vinoth Kumar Ponnusamy
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University (KMU), Kaohsiung City 807, Taiwan; Research Center for Precision Environmental Medicine, Kaohsiung Medical University (KMU), Kaohsiung City 807, Taiwan; Department of Medical Laboratory Science and Biotechnology, College of Health Sciences, Kaohsiung Medical University, Kaohsiung, Taiwan; Center for Emerging Contaminants Research, National Sun Yat-sen University (NSYSU), Kaohsiung City 804, Taiwan; Department of Medical Research, Kaohsiung Medical University Hospital (KMUH), Kaohsiung City 807, Taiwan; Department of Chemistry, National Sun Yat-sen University (NSYSU), Kaohsiung City 804, Taiwan.
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Liu Y, Guo L, Li X, Liu S, Du J, Xu J, Hu J, Liu Y. Challenges and tissue engineering strategies of periodontal guided tissue regeneration. Tissue Eng Part C Methods 2022; 28:405-419. [PMID: 35838120 DOI: 10.1089/ten.tec.2022.0106] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Periodontitis is a chronic infectious oral disease with a high prevalence rate in the world, and is a major cause of tooth loss. Nowadays, people have realized that the local microenvironment that includes proteins, cytokines, and extracellular matrix has a key influence on the functions of host immune cells and periodontal ligament stem cells during a chronic infectious disease such as periodontitis. The above pathological process of periodontitis will lead to a defect of periodontal tissues. Through the application of biomaterials, biological agents, and stem cells therapy, guided tissue regeneration (GTR) makes it possible to reconstruct healthy periodontal ligament tissue after local inflammation control. To date, substantial advances have been made in periodontal guided tissue regeneration. However, the process of periodontal remodeling experiences complex microenvironment changes, and currently periodontium regeneration still remains to be a challenging feat. In this review, we summarized the main challenges in each stage of periodontal regeneration, and try to put forward appropriate biomaterial treatment mechanisms or potential tissue engineering strategies that provide a theoretical basis for periodontal tissue engineering regeneration research.
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Affiliation(s)
- Yitong Liu
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China;
| | - Lijia Guo
- Department of Orthodontics, School of Stomatology, Capital Medical University, Beijing, China;
| | - Xiaoyan Li
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China;
| | - Siyan Liu
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China;
| | - Juan Du
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China;
| | - Junji Xu
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China;
| | - Jingchao Hu
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China;
| | - Yi Liu
- Capital Medical University School of Stomatology, Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction,, Tian Tan Xi Li No.4, Beijing, Beijing , China, 100050;
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Eftimie G, Eftimie R. Quantitative predictive approaches for Dupuytren disease: a brief review and future perspectives. MATHEMATICAL BIOSCIENCES AND ENGINEERING : MBE 2022; 19:2876-2895. [PMID: 35240811 DOI: 10.3934/mbe.2022132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In this study we review the current state of the art for Dupuytren's disease (DD), while emphasising the need for a better integration of clinical, experimental and quantitative predictive approaches to understand the evolution of the disease and improve current treatments. We start with a brief review of the biology of this disease and current treatment approaches. Then, since certain aspects in the pathogenesis of this disorder have been compared to various biological aspects of wound healing and malignant processes, next we review some in silico (mathematical modelling and simulations) predictive approaches for complex multi-scale biological interactions occurring in wound healing and cancer. We also review the very few in silico approaches for DD, and emphasise the applicability of these approaches to address more biological questions related to this disease. We conclude by proposing new mathematical modelling and computational approaches for DD, which could be used in the absence of animal models to make qualitative and quantitative predictions about the evolution of this disease that could be further tested in vitro.
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Affiliation(s)
| | - Raluca Eftimie
- Laboratoire Mathématiques de Besançon, UMR - CNRS 6623 Université de Bourgogne Franche-Comté, Besançon 25000, France
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6
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Isoherranen K, Kluger N, Hannula-Jouppi K, Väkevä L. The Role of Negative Pressure Wound Therapy (NPWT) in the Management of Vasculitic Wounds: Case Series of Eight Patients. INT J LOW EXTR WOUND 2021:15347346211063700. [PMID: 34878340 DOI: 10.1177/15347346211063700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Vasculitic ulcers belong to the category of atypical ulcers and are traditionally very slow to heal. The aim of this study is to retrospectively analyze the files of eight patients with vasculitic ulcers treated with negative pressure wound therapy (NPWT). Immunosuppression was initiated at least two weeks prior to starting NPWT. We suggest that this is a safe and promising protocol to treat these hard-to-heal ulcers.
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Affiliation(s)
- Kirsi Isoherranen
- 159841Department of Dermatology and allergology, University of Helsinki and Inflammation center, Helsinki University Hospital, Helsinki, Finland
| | - Nicolas Kluger
- 159841Department of Dermatology and allergology, University of Helsinki and Inflammation center, Helsinki University Hospital, Helsinki, Finland
| | - Katariina Hannula-Jouppi
- 159841Department of Dermatology and allergology, University of Helsinki and Inflammation center, Helsinki University Hospital, Helsinki, Finland
| | - Liisa Väkevä
- 159841Department of Dermatology and allergology, University of Helsinki and Inflammation center, Helsinki University Hospital, Helsinki, Finland
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7
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Pavan C, L R Xavier A, Ramos M, Fisher J, Kritsilis M, Linder A, Bentzer P, Nedergaard M, Lundgaard I. DNase Treatment Prevents Cerebrospinal Fluid Block in Early Experimental Pneumococcal Meningitis. Ann Neurol 2021; 90:653-669. [PMID: 34397111 DOI: 10.1002/ana.26186] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 07/29/2021] [Accepted: 07/31/2021] [Indexed: 12/30/2022]
Abstract
OBJECTIVE Streptococcus pneumoniae is the most common cause of bacterial meningitis, a disease that, despite treatment with antibiotics, still is associated with high mortality and morbidity worldwide. Diffuse brain swelling is a leading cause of morbidity in S pneumoniae meningitis. We hypothesized that neutrophil extracellular traps (NETs) disrupt cerebrospinal fluid (CSF) transport by the glymphatic system and contribute to edema formation in S pneumoniae meningitis. METHODS We used DNase I treatment to disrupt NETs and then assessed glymphatic function by cisterna magna injections of CSF tracers in a rat model of S pneumoniae meningitis. RESULTS Our analysis showed that CSF influx into the brain parenchyma, as well as CSF drainage to the cervical lymph nodes, was significantly reduced in the rat model of S pneumoniae meningitis. Degrading NETs by DNase treatment restored glymphatic transport and eliminated the increase in brain weight in the rats. In contrast, first-line antibiotic treatment had no such effect on restoring fluid dynamics. INTERPRETATION This study suggests that CSF accumulation is responsible for cerebral edema formation and identifies the glymphatic system and NETs as possible new treatment targets in S pneumoniae meningitis. ANN NEUROL 2021;90:653-669.
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Affiliation(s)
- Chiara Pavan
- Center for Translational Neuromedicine, Faculties of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Anna L R Xavier
- Center for Translational Neuromedicine, Faculties of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Marta Ramos
- Department of Experimental Medicine Science, Lund University, Lund, Sweden
- Wallenberg Center for Molecular Medicine, University of Lund, Lund, Sweden
| | - Jane Fisher
- Faculty of Medicine, Department of Clinical Sciences Lund, Division of Infection Medicine, Lund University, Lund, Sweden
| | - Marios Kritsilis
- Department of Experimental Medicine Science, Lund University, Lund, Sweden
- Wallenberg Center for Molecular Medicine, University of Lund, Lund, Sweden
| | - Adam Linder
- Faculty of Medicine, Department of Clinical Sciences Lund, Division of Infection Medicine, Lund University, Lund, Sweden
| | - Peter Bentzer
- Faculty of Medicine, Department of Clinical Sciences Lund, Division of Infection Medicine, Lund University, Lund, Sweden
- Department of Anesthesia and Intensive Care, Helsingborg Hospital, Helsingborg, Sweden
| | - Maiken Nedergaard
- Center for Translational Neuromedicine, Faculties of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Division of Glial Disease and Therapeutics, Center for Translational Neuromedicine, Department of Neurosurgery, University of Rochester Medical Center, Rochester, NY
| | - Iben Lundgaard
- Department of Experimental Medicine Science, Lund University, Lund, Sweden
- Wallenberg Center for Molecular Medicine, University of Lund, Lund, Sweden
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8
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Topical application of Dianthus essential oil improved the infected healing process of wounds infected with Staphylococcus aureus in an experimental model. JOURNAL OF RESEARCH IN APPLIED AND BASIC MEDICAL SCIENCES 2021. [DOI: 10.52547/rabms.7.1.18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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9
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El Mohtadi M, Whitehead K, Dempsey-Hibbert N, Belboul A, Ashworth J. Estrogen deficiency - a central paradigm in age-related impaired healing? EXCLI JOURNAL 2021; 20:99-116. [PMID: 33510594 PMCID: PMC7838826 DOI: 10.17179/excli2020-3210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 01/04/2021] [Indexed: 11/10/2022]
Abstract
Wound healing is a dynamic biological process achieved through four sequential, overlapping phases; hemostasis, inflammation, tissue proliferation and remodeling. For effective wound healing, all four phases must occur in the appropriate order and time frame. It is well accepted that the wound healing process becomes disrupted in the elderly, increasing the propensity of non-healing wound states that can lead to substantial patient morbidity and an enormous financial burden on healthcare systems. Estrogen deprivation in the elderly has been identified as the key driver of age-related delayed wound healing in both genders, with topical and systemic estrogen replacement reversing the detrimental effects of aging on wound repair. Evidence suggests estrogen deprivation may contribute to the development of chronic wound healing states in the elderly but research in this area is somewhat limited, warranting further investigations. Moreover, although the beneficial effects of estrogen on cutaneous healing have been widely explored, the development of estrogen-based treatments to enhance wound repair in the elderly have yet to be widely exploited. This review explores the critical role of estrogen in reversing age-related impaired healing and evaluates the prospect of developing more focused novel therapeutic strategies that enhance wound repair in the elderly via activation of specific estrogen signaling pathways in regenerating tissues, whilst leaving non-target tissues largely unaffected.
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Affiliation(s)
- Mohamed El Mohtadi
- Department of Biology, Edge Hill University, Ormskirk, Lancashire, L39 4QP, UK
| | - Kathryn Whitehead
- Centre for Bioscience, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK
| | - Nina Dempsey-Hibbert
- Centre for Bioscience, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK
| | - Amina Belboul
- Centre for Bioscience, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK
| | - Jason Ashworth
- Centre for Bioscience, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK
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Raeder K, Jachan DE, Müller-Werdan U, Lahmann NA. Prevalence and risk factors of chronic wounds in nursing homes in Germany: A Cross-Sectional Study. Int Wound J 2020; 17:1128-1134. [PMID: 32815303 PMCID: PMC7949346 DOI: 10.1111/iwj.13486] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 08/01/2020] [Accepted: 08/03/2020] [Indexed: 12/28/2022] Open
Abstract
The burdens caused by chronic wounds on the affected persons themselves and also on the health care system are well recognised. The aim of this study was to investigate the prevalence and risk factors of chronic wounds in German nursing homes. An annual cross-sectional study was conducted in nursing home residents from 2012 to 2018. The proportion of men affected by chronic wounds was to some extent higher than that of women, 9.0% males vs 7.5% females. In total, 7.8% of all residents were affected by chronic wounds. Of all residents with a chronic wound, 50.5% were affected by pressure ulcer. Male residents were twice as often affected by diabetic foot ulcer than female residents (18.0% vs 8.9%; P = 0.002). Bivariate analysis showed that chronic wounds were highly associated with poor nutrition, urinary incontinence, stool incontinence, diabetes mellitus, and limited mobility (P = 0.000). According to multivariate analysis, the strongest predictors for chronic wounds were limited mobility and diabetes mellitus. The highest prevalence of chronic wounds was in residents who were not restricted in their mobility, had diabetes, were male, and lived in a metropolitan region (23.7%). This study identified the prevalence and risk factors of chronic wounds in nursing home residents. Further research is needed to identify causal factors of the gender difference in the prevalence of chronic wounds. This may have an impact on the choice of prophylactic and therapeutic measures.
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Affiliation(s)
- Kathrin Raeder
- Charité - Universitätsmedizin Berlin, Department of Geriatric Medicine, Nursing Research Group in Geriatrics, Berlin, Germany
| | - Deborah Elisabeth Jachan
- Charité - Universitätsmedizin Berlin, Department of Geriatric Medicine, Nursing Research Group in Geriatrics, Berlin, Germany
| | - Ursula Müller-Werdan
- Charité - Universitätsmedizin Berlin, Department of Geriatric Medicine, Nursing Research Group in Geriatrics, Berlin, Germany
| | - Nils Axel Lahmann
- Charité - Universitätsmedizin Berlin, Department of Geriatric Medicine, Nursing Research Group in Geriatrics, Berlin, Germany
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11
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Torres M, Wang J, Yannie PJ, Ghosh S, Segal RA, Reynolds AM. Identifying important parameters in the inflammatory process with a mathematical model of immune cell influx and macrophage polarization. PLoS Comput Biol 2019; 15:e1007172. [PMID: 31365522 PMCID: PMC6690555 DOI: 10.1371/journal.pcbi.1007172] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 08/12/2019] [Accepted: 06/07/2019] [Indexed: 02/08/2023] Open
Abstract
In an inflammatory setting, macrophages can be polarized to an inflammatory M1 phenotype or to an anti-inflammatory M2 phenotype, as well as existing on a spectrum between these two extremes. Dysfunction of this phenotypic switch can result in a population imbalance that leads to chronic wounds or disease due to unresolved inflammation. Therapeutic interventions that target macrophages have therefore been proposed and implemented in diseases that feature chronic inflammation such as diabetes mellitus and atherosclerosis. We have developed a model for the sequential influx of immune cells in the peritoneal cavity in response to a bacterial stimulus that includes macrophage polarization, with the simplifying assumption that macrophages can be classified as M1 or M2. With this model, we were able to reproduce the expected timing of sequential influx of immune cells and mediators in a general inflammatory setting. We then fit this model to in vivo experimental data obtained from a mouse peritonitis model of inflammation, which is widely used to evaluate endogenous processes in response to an inflammatory stimulus. Model robustness is explored with local structural and practical identifiability of the proposed model a posteriori. Additionally, we perform sensitivity analysis that identifies the population of apoptotic neutrophils as a key driver of the inflammatory process. Finally, we simulate a selection of proposed therapies including points of intervention in the case of delayed neutrophil apoptosis, which our model predicts will result in a sustained inflammatory response. Our model can therefore provide hypothesis testing for therapeutic interventions that target macrophage phenotype and predict outcomes to be validated by subsequent experimentation. Using experimental data and mathematical analysis, we develop a model for the inflammatory response that includes macrophage polarization between M1 and M2 phenotypes. Dysfunction of this phenotypic switch can disrupt the timely influx and egress of immune cells during the healing process and lead to chronic wounds or disease. The modulation of macrophage population has been suggested as a strategy to dampen inflammation in diseases that feature chronic inflammation, such as diabetes and atherosclerosis. It is therefore important that we learn more about which components of the system drive the population level switch in phenotype. Our model is able to reproduce the expected timing of sequential influx of neutrophils and macrophages in response to an inflammatory stimulus. Model parameters were estimated with weighted least squares fitting to in vivo experimental data from a mouse model of peritonitis while considering identifiability of parameter sets. We perform sensitivity analysis that identifies primary drivers of the system, and predict the effects of variations in these key parameters on immune cell populations.
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Affiliation(s)
- Marcella Torres
- Department of Mathematics and Applied Mathematics, Virginia Commonwealth University, Richmond, Virginia, United States of America
| | - Jing Wang
- Department of Internal Medicine, Virginia Commonwealth University, Richmond, Virginia, United States of America
| | - Paul J. Yannie
- Hunter Holmes McGuire VA Medical Center, Richmond, Virginia, United States of America
| | - Shobha Ghosh
- Department of Internal Medicine, Virginia Commonwealth University, Richmond, Virginia, United States of America
- Hunter Holmes McGuire VA Medical Center, Richmond, Virginia, United States of America
| | - Rebecca A. Segal
- Department of Mathematics and Applied Mathematics, Virginia Commonwealth University, Richmond, Virginia, United States of America
| | - Angela M. Reynolds
- Department of Mathematics and Applied Mathematics, Virginia Commonwealth University, Richmond, Virginia, United States of America
- Victoria Johnson Center for Lung Disease Research, Virginia Commonwealth University, Richmond, Virginia, United States of America
- * E-mail:
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12
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Correia CR, Gaifem J, Oliveira MB, Silvestre R, Mano JF. The influence of surface modified poly(l-lactic acid) films on the differentiation of human monocytes into macrophages. Biomater Sci 2018; 5:551-560. [PMID: 28128374 DOI: 10.1039/c6bm00920d] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Macrophages play a crucial role in the biological performance of biomaterials, as key factors in defining the optimal inflammation-healing balance towards tissue regeneration and implant integration. Here, we investigate how different surface modifications performed on poly(l-lactic acid) (PLLA) films would influence the differentiation of human monocytes into macrophages. We tested PLLA films without modification, surface-modified by plasma treatment (pPLLA) or by combining plasma treatment with different coating materials, namely poly(l-lysine) and a series of proteins from the extracellular matrix: collagen I, fibronectin, vitronectin, laminin and albumin. While all the tested films are non-cytotoxic, differences in cell adhesion and morphology are observed. Monocyte-derived macrophages (MDM) present a more rounded shape in non-modified films, while a more elongated phenotype is observed containing filopodia-like and podosome-like structures in all modified films. No major differences are found for the expression of HLA-DR+/CD80+ and CD206+/CD163+ surface markers, as well as for the ability of MDM to phagocytize. Interestingly, MDM differentiated on pPLLA present the highest expression of MMP9. Upon differentiation, MDM in all surface modified films present lower amounts of IL-6 and IL-10 compared to non-modified films. After stimulating MDM with the potent pro-inflammatory agent LPS, pPLLA and poly(l-lysine) and fibronectin-modified films reveal a significant reduction in IL-6 secretion, while the opposite effect is observed with IL-10. Of note, in comparison to non-modified films, all surface modified films induce a significant reduction of the IL-6/IL-10 ratio, a valuable prognosticator of the pro- versus anti-inflammatory balance. These findings provide important insights into MDM-biomaterial interactions, while strengthening the need for designing immune-informed biomaterials.
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Affiliation(s)
- Clara R Correia
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4805-017 Barco, Guimarães, Portugal. and ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal.
| | - Joana Gaifem
- ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal. and Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal
| | - Mariana B Oliveira
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4805-017 Barco, Guimarães, Portugal. and ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal.
| | - Ricardo Silvestre
- ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal. and Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal
| | - João F Mano
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4805-017 Barco, Guimarães, Portugal. and ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal.
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13
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Estrogen Effects on Wound Healing. Int J Mol Sci 2017; 18:ijms18112325. [PMID: 29099810 PMCID: PMC5713294 DOI: 10.3390/ijms18112325] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 10/30/2017] [Accepted: 11/02/2017] [Indexed: 02/07/2023] Open
Abstract
Wound healing is a physiological process, involving three successive and overlapping phases—hemostasis/inflammation, proliferation, and remodeling—to maintain the integrity of skin after trauma, either by accident or by procedure. Any disruption or unbalanced distribution of these processes might result in abnormal wound healing. Many molecular and clinical data support the effects of estrogen on normal skin homeostasis and wound healing. Estrogen deficiency, for example in postmenopausal women, is detrimental to wound healing processes, notably inflammation and re-granulation, while exogenous estrogen treatment may reverse these effects. Understanding the role of estrogen on skin might provide further opportunities to develop estrogen-related therapy for assistance in wound healing.
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Gobbi S, Hu Q, Zimmer C, Belluti F, Rampa A, Hartmann RW, Bisi A. Targeting Steroidogenic Cytochromes P450 (CYPs) with 6-Substituted 1-Imidazolylmethylxanthones. ChemMedChem 2016; 11:1770-7. [DOI: 10.1002/cmdc.201600078] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 03/11/2016] [Indexed: 12/26/2022]
Affiliation(s)
- Silvia Gobbi
- Department of Pharmacy and Biotechnology; University of Bologna; Via Belmeloro 6 40126 Bologna Italy
| | - Qingzhong Hu
- Pharmaceutical and Medicinal Chemistry; Saarland University & Helmholtz Institute for Pharmaceutical Research Saarland (HIPS); Universitätscampus E8 1 66123 Saarbrücken Germany
- Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
| | - Christina Zimmer
- Pharmaceutical and Medicinal Chemistry; Saarland University & Helmholtz Institute for Pharmaceutical Research Saarland (HIPS); Universitätscampus E8 1 66123 Saarbrücken Germany
| | - Federica Belluti
- Department of Pharmacy and Biotechnology; University of Bologna; Via Belmeloro 6 40126 Bologna Italy
| | - Angela Rampa
- Department of Pharmacy and Biotechnology; University of Bologna; Via Belmeloro 6 40126 Bologna Italy
| | - Rolf W. Hartmann
- Pharmaceutical and Medicinal Chemistry; Saarland University & Helmholtz Institute for Pharmaceutical Research Saarland (HIPS); Universitätscampus E8 1 66123 Saarbrücken Germany
| | - Alessandra Bisi
- Department of Pharmacy and Biotechnology; University of Bologna; Via Belmeloro 6 40126 Bologna Italy
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15
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Gobbi S, Hu Q, Zimmer C, Engel M, Belluti F, Rampa A, Hartmann RW, Bisi A. Exploiting the Chromone Scaffold for the Development of Inhibitors of Corticosteroid Biosynthesis. J Med Chem 2016; 59:2468-77. [DOI: 10.1021/acs.jmedchem.5b01609] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Silvia Gobbi
- Department
of Pharmacy and Biotechnology, University of Bologna, Via Belmeloro,
6, I-40126 Bologna, Italy
| | - Qingzhong Hu
- Pharmaceutical
and Medicinal Chemistry, Saarland University and Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Universitätscampus E8 1, 66123 Saarbrücken, Germany
| | - Christina Zimmer
- Pharmaceutical
and Medicinal Chemistry, Saarland University and Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Universitätscampus E8 1, 66123 Saarbrücken, Germany
| | - Matthias Engel
- Pharmaceutical
and Medicinal Chemistry, Saarland University and Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Universitätscampus E8 1, 66123 Saarbrücken, Germany
| | - Federica Belluti
- Department
of Pharmacy and Biotechnology, University of Bologna, Via Belmeloro,
6, I-40126 Bologna, Italy
| | - Angela Rampa
- Department
of Pharmacy and Biotechnology, University of Bologna, Via Belmeloro,
6, I-40126 Bologna, Italy
| | - Rolf W. Hartmann
- Pharmaceutical
and Medicinal Chemistry, Saarland University and Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Universitätscampus E8 1, 66123 Saarbrücken, Germany
| | - Alessandra Bisi
- Department
of Pharmacy and Biotechnology, University of Bologna, Via Belmeloro,
6, I-40126 Bologna, Italy
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16
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Bicer YO, Koybasi S, Seyhan S, Firat T, Kazaz H. Outcomes from Cyanoacrylate Use in Tracheal Anastomosis in a Rat Model. Otolaryngol Head Neck Surg 2015; 153:815-21. [PMID: 26340926 DOI: 10.1177/0194599815601986] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Accepted: 07/31/2015] [Indexed: 11/16/2022]
Abstract
OBJECTIVES We aimed to investigate the histologic effects of N-butyl-2-cyanoacrylate (NBCA) and metacryloxisulfolane (MS) comonomer on tracheal anastomosis in vivo on a rat model of tracheal resection and end-to-end anastomosis. STUDY DESIGN Animal experiment. Rat model of tracheal resection and end-to-end anastomosis. SETTING Animal laboratory. SUBJECTS AND METHODS Tracheal resection and end-to-end anastomosis were performed in 28 Wistar albino rats. Rats were randomly divided into 2 groups: control (n = 14), in which anastomoses were performed with 8/0 Vicryl, and study (n = 14), in which NBCA and MS comonomer was used in addition to 8/0 Vicryl to perform anastomosis. Seven rats from each group were sacrificed on day 7 and the remaining on day 28 for gross and histologic examination. RESULTS Indurations at the site of anastomoses were detected in all rats of study group. Slight narrowing at the site of anastomosis was observed in 8 rats of the study group and in only 1 of the control group. The difference was significant on day 28 (P = .021). The inflammatory cell infiltration was significantly increased in the study group on day 28 (P = .022). Epithelial regeneration was found to be worse in the study group on day 28 (P = .022). CONCLUSIONS The use of NBCA and MS comonomer increased the inflammation in rat tracheal anastomosis with respect to inflammatory cell count and epithelial regeneration. So the use of NBCA and MS comonomer in tracheal surgery cannot be recommended yet in the light of our data.
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Affiliation(s)
- Yusuf Ozgur Bicer
- Department of Otolaryngology, Faculty of Medicine, Abant Izzet Baysal University, Bolu, Turkey
| | - Serap Koybasi
- Department of Otolaryngology, Faculty of Medicine, Abant Izzet Baysal University, Bolu, Turkey
| | - Sinan Seyhan
- Department of Otolaryngology, Faculty of Medicine, Abant Izzet Baysal University, Bolu, Turkey
| | - Tulin Firat
- Department of Histology and Embryology, Faculty of Medicine, Abant Izzet Baysal University, Bolu, Turkey
| | - Hasan Kazaz
- Department of Otolaryngology, Faculty of Medicine, Abant Izzet Baysal University, Bolu, Turkey
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Geller FC, Teixeira MR, Pereira ABD, Dourado LPA, Souza DG, Braga FC, Simões CMO. Evaluation of the Wound Healing Properties ofHancornia speciosaLeaves. Phytother Res 2015; 29:1887-93. [DOI: 10.1002/ptr.5438] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Revised: 07/22/2015] [Accepted: 07/28/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Fabiana Cristina Geller
- Department of Pharmaceutical Sciences, Center of Health Sciences; Universidade Federal de Santa Catarina; Campus Trindade Florianópolis SC 88.040-900 Brazil
| | - Marina Rodrigues Teixeira
- Department of Pharmaceutical Sciences, Center of Health Sciences; Universidade Federal de Santa Catarina; Campus Trindade Florianópolis SC 88.040-900 Brazil
| | - Ana Bárbara Dias Pereira
- Department of Pharmaceutical Products, Faculty of Pharmacy; Federal University of Minas Gerais; Belo Horizonte MG Brazil
| | - Luana Pereira Antunes Dourado
- Department of Microbiology, Institute of Biological Sciences; Universidade Federal de Minas Gerais; Campus Pampulha Belo Horizonte MG 31.270-901 Brazil
| | - Danielle G. Souza
- Department of Microbiology, Institute of Biological Sciences; Universidade Federal de Minas Gerais; Campus Pampulha Belo Horizonte MG 31.270-901 Brazil
| | - Fernão Castro Braga
- Department of Pharmaceutical Products, Faculty of Pharmacy; Federal University of Minas Gerais; Belo Horizonte MG Brazil
| | - Cláudia Maria Oliveira Simões
- Department of Pharmaceutical Sciences, Center of Health Sciences; Universidade Federal de Santa Catarina; Campus Trindade Florianópolis SC 88.040-900 Brazil
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