1
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Zeng Z, Yoshida Y, Wang D, Fujii Y, Shen M, Mimura T, Tanaka Y. Inflammatory Cytokines and Chemokines Are Synergistically Induced in a ROS-Dependent Manner by a Co-Culture of Corneal Epithelial Cells and Neutrophil-like Cells in the Presence of Particulate Matter. Antioxidants (Basel) 2024; 13:467. [PMID: 38671915 PMCID: PMC11047649 DOI: 10.3390/antiox13040467] [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: 02/29/2024] [Revised: 03/31/2024] [Accepted: 04/12/2024] [Indexed: 04/28/2024] Open
Abstract
Ocular exposure to particulate matter (PM) causes local inflammation; however, the influence of neutrophils on PM-induced ocular inflammation is still not fully understood. In this study, we constructed a system to investigate the role of PM in ocular inflammation using a co-culture of human corneal epithelial cells (HCE-T) and differentiation-induced neutrophils (dHL-60). To investigate whether HCE-T directly endocytosed PM, we performed a holographic analysis, which showed the endocytosis of PM in HCE-T. The cytokines and chemokines produced by HCE-T were measured using an ELISA. HCE-T treated with PM produced IL-6 and IL-8, which were inhibited by N-Acetyl-L-cysteine (NAC), suggesting the involvement of ROS. Their co-culture with dHL-60 enhanced their production of IL-6, IL-8, and MCP-1. This suggests an inflammatory loop involving intraocular corneal epithelial cells and neutrophils. These cytokines and chemokines are mainly regulated by NF-κB. Therefore, this co-culture system was examined in the presence of an IKK inhibitor known to downregulate NF-κB activity. The IKK inhibitor dramatically suppressed the production of these factors in co-culture supernatants. The results suggest that the inflammatory loop observed in the co-culture is mediated through ROS and the transcription factor NF-κB. Thus, the co-culture system is considered a valuable tool for analyzing complex inflammations.
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Affiliation(s)
- Zirui Zeng
- The First Department of Internal Medicine, School of Medicine, University of Occupational and Environmental Health, Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu 807-8555, Japan
| | - Yasuhiro Yoshida
- Department of Immunology and Parasitology, School of Medicine, University of Occupational and Environmental Health, Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu 807-8555, Japan; (Y.F.)
| | - Duo Wang
- Department of Radiobiology and Hygiene Management, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu 807-8555, Japan
| | - Yuri Fujii
- Department of Immunology and Parasitology, School of Medicine, University of Occupational and Environmental Health, Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu 807-8555, Japan; (Y.F.)
| | - Mengyue Shen
- Department of Immunology and Parasitology, School of Medicine, University of Occupational and Environmental Health, Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu 807-8555, Japan; (Y.F.)
- Department of Medical Teaching, West China Center of Medical Sciences of Sichuan University, Chengdu 610041, China
| | - Tatsuya Mimura
- Department of Ophthalmology, Teikyo University School of Medicine, Tokyo 173-0003, Japan
| | - Yoshiya Tanaka
- The First Department of Internal Medicine, School of Medicine, University of Occupational and Environmental Health, Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu 807-8555, Japan
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2
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Abdalkader RK, Fujita T. Corneal epithelium models for safety assessment in drug development: Present and future directions. Exp Eye Res 2023; 237:109697. [PMID: 37890755 DOI: 10.1016/j.exer.2023.109697] [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: 06/30/2022] [Revised: 10/18/2023] [Accepted: 10/24/2023] [Indexed: 10/29/2023]
Abstract
The human corneal epithelial barrier plays a crucial role in drug testing studies, including drug absorption, distribution, metabolism, and excretion (ADME), as well as toxicity testing during the preclinical stages of drug development. However, despite the valuable insights gained from animal and current in vitro models, there remains a significant discrepancy between preclinical drug predictions and actual clinical outcomes. Additionally, there is a growing emphasis on adhering to the 3R principles (refine, reduce, replace) to minimize the use of animals in testing. To tackle these challenges, there is a rising demand for alternative in vitro models that closely mimic the human corneal epithelium. Recently, remarkable advancements have been made in two key areas: microphysiological systems (MPS) or organs-on-chips (OoCs), and stem cell-derived organoids. These cutting-edge platforms integrate four major disciplines: stem cells, microfluidics, bioprinting, and biosensing technologies. This integration holds great promise in developing powerful and biomimetic models of the human cornea.
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Affiliation(s)
- Rodi Kado Abdalkader
- Ritsumeikan Global Innovation Research Organization (R-GIRO), Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga, 525-8577, Japan.
| | - Takuya Fujita
- Ritsumeikan Global Innovation Research Organization (R-GIRO), Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga, 525-8577, Japan; Department of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga, 525-8577, Japan
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3
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Anandi L, Garcia J, Janská L, Liu J, Ros M, Carmona-Fontaine C. Direct visualization of emergent metastatic features within an ex vivo model of the tumor microenvironment. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.01.09.523294. [PMID: 36712084 PMCID: PMC9882016 DOI: 10.1101/2023.01.09.523294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Preventing tumor cells from acquiring metastatic properties would significantly reduce cancer mortality 1-5 . However, due to the complex nature of this process, it remains one of the most poorly understood and untreatable aspects of cancer 6-8 . Ischemia and hypoxia in solid tumors are requisite in metastasis formation - conditions that arise far from functional blood vessels and deep within tumor tissues 9,10 . These secluded locations impede the observation of pre-metastatic tumor cells and their interactions with stromal cells, which are also critical in the initiation of this process 11,12 . Thus, the initiation of metastasis has been incredibly difficult to model in the lab and to observe in vivo . We present an ex vivo model of the tumor microenvironment, called 3MIC, which overcomes these experimental challenges and enables the observation of ischemic tumor cells in their native 3D context with high spatial and temporal resolutions. The 3MIC recreates ischemic conditions in the tumor microenvironment and facilitates the co-culture of different cell types. Using live microscopy, we showed that ischemia, but not hypoxia alone, increases the motility and invasive properties of cells derived from primary tumors. These changes are phenotypic and can occur without clonal selection. We directly observed how interactions with stromal cells such as macrophages increased tumor invasion in conjunction with the effects of an ischemic microenvironment. Finally, we tested the effects of chemotherapy drugs under different metabolic microenvironments and found that ischemic tumor cells are more resistant to paclitaxel, possibly due to a metabolic resistance mechanism. Overall, the 3MIC is a cost-effective system that allows for the dissection of the complexity of the tumor microenvironment and direct observation of the emergence of metastasis, as well as the testing of treatments that may halt this process.
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4
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Bonassera M, Clews E, BéruBé K. Transparency in Non-Technical Project Summaries to Promote the Three Rs in Respiratory Disease Research. Altern Lab Anim 2022; 50:349-364. [DOI: 10.1177/02611929221121076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Non-Technical Project Summaries (NTS) are legal documents that were first introduced by the Directive 2010/63/EU to enhance transparency within scientific animal experimentation. Researchers intending to conduct biological research on animal models must fulfil the NTS requirements by outlining their proposed use of animals and how they plan to implement the Three Rs (replacement, reduction and refinement of animal use) in their experiments. This study outlines a novel systematic analysis approach that enables the assessment of NTS transparency based on the accuracy of reporting of certain Three Rs-specific information. This potentially customisable strategy could help toward the development of practical guidelines for use by Animal Welfare and Ethical Review Bodies (AWERBs) in establishments conducting animal research, in the process of scrutinising NTS during their pre-submission review of proposed licence applications. This could help to identify gaps in reporting of Three Rs-specific information relating to the planned animal experiments, which represents a remarkable step toward achieving greater openness in scientific communication. This study supports the concept that NTS transparency can promote the implementation of non-animal alternatives in fields where this is currently lacking, such as respiratory disease research. Although NTS were originally conceived as informative documents for a lay audience, we can conclude that data in NTS can be successfully used as a basis for systematic analysis. By reviewing the NTS, the experimental limitations of the currently available replacement strategies can also be highlighted, potentially pinpointing where there is a need for future method development.
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Affiliation(s)
| | - Esther Clews
- School of Biosciences, Cardiff University, Cardiff, Wales, UK
| | - Kelly BéruBé
- School of Biosciences, Cardiff University, Cardiff, Wales, UK
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5
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Abstract
Translational biomedical research relies on animal experiments and provides the underlying proof of practice for clinical trials, which places an increased duty of care on translational researchers to derive the maximum possible output from every experiment performed. The implementation of open science practices has the potential to initiate a change in research culture that could improve the transparency and quality of translational research in general, as well as increasing the audience and scientific reach of published research. However, open science has become a buzzword in the scientific community that can often miss mark when it comes to practical implementation. In this Essay, we provide a guide to open science practices that can be applied throughout the research process, from study design, through data collection and analysis, to publication and dissemination, to help scientists improve the transparency and quality of their work. As open science practices continue to evolve, we also provide an online toolbox of resources that we will update continually. Open science has become a buzzword in the scientific community that too often misses the practical application for individual researchers. This Essay, provides a guide to choosing the most appropriate tools to make animal research more transparent.
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6
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Schwedhelm P, Kusnick J, Heinl C, Schönfelder G, Bert B. How many animals are used for SARS-CoV-2 research?: An overview on animal experimentation in pre-clinical and basic research. EMBO Rep 2021; 22:e53751. [PMID: 34490973 PMCID: PMC8490974 DOI: 10.15252/embr.202153751] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 08/19/2021] [Indexed: 11/09/2022] Open
Abstract
Non-technical summaries of research projects allow tracking the numbers and purpose of animal experiments related to SARS-CoV2 research so as to provide greater transparency on animal use.
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Affiliation(s)
- Philipp Schwedhelm
- German Centre for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment, Berlin, Germany
| | - Johanna Kusnick
- German Centre for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment, Berlin, Germany.,Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany
| | - Céline Heinl
- German Centre for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment, Berlin, Germany
| | - Gilbert Schönfelder
- German Centre for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment, Berlin, Germany.,Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Bettina Bert
- German Centre for the Protection of Laboratory Animals (Bf3R), German Federal Institute for Risk Assessment, Berlin, Germany
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7
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Tilelli CQ, Flôres LR, Cota VR, Castro OWD, Garcia-Cairasco N. Amygdaloid complex anatomopathological findings in animal models of status epilepticus. Epilepsy Behav 2021; 121:106831. [PMID: 31864944 DOI: 10.1016/j.yebeh.2019.106831] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 11/15/2019] [Accepted: 11/25/2019] [Indexed: 12/13/2022]
Abstract
Temporal lobe epileptic seizures are one of the most common and well-characterized types of epilepsies. The current knowledge on the pathology of temporal lobe epilepsy relies strongly on studies of epileptogenesis caused by experimentally induced status epilepticus (SE). Although several temporal lobe structures have been implicated in the epileptogenic process, the hippocampal formation is the temporal lobe structure studied in the greatest amount and detail. However, studies in human patients and animal models of temporal lobe epilepsy indicate that the amygdaloid complex can be also an important seizure generator, and several pathological processes have been shown in the amygdala during epileptogenesis. Therefore, in the present review, we systematically selected, organized, described, and analyzed the current knowledge on anatomopathological data associated with the amygdaloid complex during SE-induced epileptogenesis. Amygdaloid complex participation in the epileptogenic process is evidenced, among others, by alterations in energy metabolism, circulatory, and fluid regulation, neurotransmission, immediate early genes expression, tissue damage, cell suffering, inflammation, and neuroprotection. We conclude that major efforts should be made in order to include the amygdaloid complex as an important target area for evaluation in future research on SE-induced epileptogenesis. This article is part of the Special Issue "NEWroscience 2018".
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Affiliation(s)
- Cristiane Queixa Tilelli
- Laboratory of Physiology, Campus Centro-Oeste Dona Lindu, Universidade Federal de São João del-Rei, Av. Sebastião Gonçalves Coelho, 400, Bairro Belvedere, Divinópolis, MG 35.501-296, Brazil.
| | - Larissa Ribeiro Flôres
- Laboratory of Physiology, Campus Centro-Oeste Dona Lindu, Universidade Federal de São João del-Rei, Av. Sebastião Gonçalves Coelho, 400, Bairro Belvedere, Divinópolis, MG 35.501-296, Brazil
| | - Vinicius Rosa Cota
- Laboratory of Neuroengineering and Neuroscience (LINNce), Department of Electrical Engineering, Campus Santo Antônio, Universidade Federal de São João del-Rei, Praça Frei Orlando, 170, Centro, São João Del Rei, MG 36307-352, Brazil
| | - Olagide Wagner de Castro
- Institute of Biological Sciences and Health, Campus A. C. Simões, Universidade Federal de Alagoas, Av. Lourival Melo Mota, s/n, Tabuleiro do Martins, Maceió, AL 57072-970, Brazil
| | - Norberto Garcia-Cairasco
- Neurophysiology and Experimental Neuroethology Laboratory (LNNE), Department of Physiology, School of Medicine, Universidade de São Paulo, Av. Bandeirantes, 3900, Monte Alegre, Ribeirão Preto, SP 14049-900, Brazil.
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8
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Janská L, Anandi L, Kirchberger NC, Marinkovic ZS, Schachtner LT, Guzelsoy G, Carmona-Fontaine C. The MEMIC: An ex vivo system to model the complexity of the tumor microenvironment. Dis Model Mech 2021; 14:271783. [PMID: 34407185 PMCID: PMC8382743 DOI: 10.1242/dmm.048942] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 07/12/2021] [Indexed: 01/02/2023] Open
Abstract
There is an urgent need for accurate, scalable and cost-efficient models of the tumor microenvironment. Here, we detail how to fabricate and use the metabolic microenvironment chamber (MEMIC) – a 3D-printed ex vivo model of intratumoral heterogeneity. A major driver of the cellular and molecular diversity in tumors is accessibility to the blood stream. Whereas perivascular tumor cells have direct access to oxygen and nutrients, cells further from the vasculature must survive under progressively more ischemic environments. The MEMIC simulates this differential access to nutrients, allow co-culturing any number of cell types, and it is optimized for live imaging and other microscopy-based analyses. Owing to a modular design and full experimental control, the MEMIC provides insights into the tumor microenvironment that would be difficult to obtain via other methods. As proof of principle, we show that cells sense gradual changes in metabolite concentration leading to predictable molecular and cellular spatial patterns. We propose the MEMIC as a complement to standard in vitro and in vivo experiments, diversifying the tools available to accurately model, perturb and monitor the tumor microenvironment. Editor's choice: We present how to fabricate the MEMIC, an experimental model of the tumor microenvironment, describing proof-of-principle experiments and providing image analysis tools that are helpful when using this system.
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Affiliation(s)
- Libuše Janská
- Center for Genomics & Systems Biology, Department of Biology, New York University, New York, NY 10003, USA
| | - Libi Anandi
- Center for Genomics & Systems Biology, Department of Biology, New York University, New York, NY 10003, USA
| | - Nell C Kirchberger
- Center for Genomics & Systems Biology, Department of Biology, New York University, New York, NY 10003, USA
| | - Zoran S Marinkovic
- Center for Genomics & Systems Biology, Department of Biology, New York University, New York, NY 10003, USA
| | - Logan T Schachtner
- Center for Genomics & Systems Biology, Department of Biology, New York University, New York, NY 10003, USA
| | - Gizem Guzelsoy
- Center for Genomics & Systems Biology, Department of Biology, New York University, New York, NY 10003, USA
| | - Carlos Carmona-Fontaine
- Center for Genomics & Systems Biology, Department of Biology, New York University, New York, NY 10003, USA
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9
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Three-Dimensional Culture Models to Study Innate Anti-Tumor Immune Response: Advantages and Disadvantages. Cancers (Basel) 2021; 13:cancers13143417. [PMID: 34298630 PMCID: PMC8303518 DOI: 10.3390/cancers13143417] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 06/29/2021] [Accepted: 07/05/2021] [Indexed: 12/12/2022] Open
Abstract
Several approaches have shown that the immune response against tumors strongly affects patients' clinical outcome. Thus, the study of anti-tumor immunity is critical to understand and potentiate the mechanisms underlying the elimination of tumor cells. Natural killer (NK) cells are members of innate immunity and represent powerful anti-tumor effectors, able to eliminate tumor cells without a previous sensitization. Thus, the study of their involvement in anti-tumor responses is critical for clinical translation. This analysis has been performed in vitro, co-incubating NK with tumor cells and quantifying the cytotoxic activity of NK cells. In vivo confirmation has been applied to overcome the limits of in vitro testing, however, the innate immunity of mice and humans is different, leading to discrepancies. Different activating receptors on NK cells and counter-ligands on tumor cells are involved in the antitumor response, and innate immunity is strictly dependent on the specific microenvironment where it takes place. Thus, three-dimensional (3D) culture systems, where NK and tumor cells can interact in a tissue-like architecture, have been created. For example, tumor cell spheroids and primary organoids derived from several tumor types, have been used so far to analyze innate immune response, replacing animal models. Herein, we briefly introduce NK cells and analyze and discuss in detail the properties of 3D tumor culture systems and their use for the study of tumor cell interactions with NK cells.
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10
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Seki H, Fujiwara T, Hijikata W, Murashige T, Tahara T, Yokota S, Ogata A, Ohuchi K, Mizuno T, Arai H. Evaluation of real-time thrombus detection method in a magnetically levitated centrifugal blood pump using a porcine left ventricular assist circulation model. Artif Organs 2021; 45:726-735. [PMID: 33432615 DOI: 10.1111/aor.13915] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 12/16/2020] [Accepted: 01/04/2021] [Indexed: 01/08/2023]
Abstract
Pump thrombosis induces significant complications and requires timely detection. We proposed real-time monitoring of pump thrombus in a magnetically levitated centrifugal blood pump (mag-lev pump) without using additional sensors, by focusing on the changes in the displacement of the pump impeller. The phase difference between the current and displacement of the impeller increases with pump thrombus. This thrombus detection method was previously evaluated through simulated circuit experiments using porcine blood. Evaluation of real-time thrombus detection in a mag-lev blood pump was performed using a porcine left ventricular assist circulation model in this study. Acute animal experiments were performed five times using five Japanese domestic pigs. To create thrombogenic conditions, fibrinogen coating that induces thrombus formation in a short time was applied to the inner surfaces of the pump. An inflow and an outflow cannula were inserted into the apex of the left ventricle and the carotid artery, respectively, by a minimally invasive surgical procedure that allowed minimal bleeding and hypothermia. Pump flow was maintained at 1 L/min without anticoagulation. The vibrational frequency of the impeller (70 Hz) and its vibrational amplitude (30 μm) were kept constant. The thrombus was detected based on the fact that the phase difference between the impeller displacement and input current to the magnetic bearing increases when a thrombus is formed inside a pump. The experiment was terminated when the phase difference increased by over 1° from the lowest value or when the phase difference was at the lowest value 12 hours after commencing measurements. The phase difference increased by over 1° in three cases. The pump was stopped after 12 hours in two cases. Pump thrombi were found in the pump in three cases in which the phase difference increased by over 1°. No pump thrombus was found in the other two cases in which the phase difference did not increase. We succeeded in real-time thrombus monitoring of a mag-lev pump in acute animal experiments.
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Affiliation(s)
- Haruna Seki
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tatsuki Fujiwara
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Wataru Hijikata
- School of Engineering, Tokyo Institute of Technology, Tokyo, Japan
| | - Tomotaka Murashige
- School of Engineering, Tokyo Institute of Technology, Tokyo, Japan.,Department of Advanced Surgical Technology Research and Development, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tomoki Tahara
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Sachie Yokota
- Faculty of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - Asato Ogata
- Faculty of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - Katsuhiro Ohuchi
- Department of Advanced Surgical Technology Research and Development, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tomohiro Mizuno
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hirokuni Arai
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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11
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Huang H, Chen D, Lippuner K, Hunziker EB. Induced Experimental Periimplantitis and Periodontitis: What are the Differences in the Inflammatory Response ? J ORAL IMPLANTOL 2020; 47:359-369. [PMID: 33259586 DOI: 10.1563/aaid-joi-d-19-00362] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This preliminary study investigates the differences between experimental periodontitis and periimplantitis in a dog model, with a focus on the histopathology, the inflammatory responses and specific immunoregulatory activities, driven by Th1/Th2 positive cells. Twelve dental implants were inserted into the edentulated posterior mandibles of six Beagle dogs and were given twelve weeks time for osseointegration. Experimental periimplantitis and periodontitis (first mandible molar) was then induced using cotton-floss ligatures. Twelve weeks later, alveolar bones were quantitated by cone beam-computer tomography. Histopathological analysis of the inflamed gingiva and of the periodontal tissues was performed by light microscopy, and the Th1/ Th2 cell populations were investigated by flow cytometry. Periimplantitis as well as periodontitis were both found to be associated with pronounced bone resorption effects, both to a similar degree vertically, but with a differential bone resorption pattern mesio-distally, and with a significantly higher and consistent bone resorption result in periimplantitis; however, with a higher variance of bone resorption in periodontitis. The histological appearances of the inflammatory tissues were identical. The percentages of Th1/ Th2 cells in the inflamed gingival tissues of both experimental periimplantitis and periodontitis were also found to be similar. Experimental periodontitis and periimplantitis in the dog model show essentially the same cellular pathology of inflammation. However, bone resorption was found to be significantly higher in periimplantitis; the histopathological changes in the periodontal tissues were similar in both groups, but showed a higher inter-individual variation in periodontitis, and appeared more uniform in periimplantitis. This preliminary study indicates that more focused experimental in-vivo inflammation models need to be developed to better simulate the human pathology in the two different diseases, and in order to have a valuable tool to investigate more specifically how novel treatments/prevention approaches may heal the differential adverse effects on bone tissue and on periodontium in periodontitis and in periimplantitis.
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Affiliation(s)
- Hairong Huang
- Department of Oral Implantology and Prosthetic Dentistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije University Amsterdam, Gustav Mahlerlaan 3004, 1081LA Amsterdam, Nord-Holland, the Netherlands
| | - Dong Chen
- State Key Laboratory of Basic Science of Stomatology, Laboratory of Oral Biomedicine, School and Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Kurt Lippuner
- Department of Osteoporosis, Inselspital Bern University Hospital, Freiburgstrasse 3, CH-3010 Bern, Switzerland
| | - Ernst Bruno Hunziker
- Inselspital Universitatsspital Bern Research Head Osteoporosis and Othopaedic Research Freiburgstrasse 3 SWITZERLAND Bern Bern 3010 +41860794446551 +41794446551 Departments of Osteoporosis and Orthopaedic Surgery, Inselspital Bern University Hospital, Freiburgstrasse 3, CH-3010 Bern, Switzerland
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12
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Abstract
Animal welfare is a growing societal concern and the well-being of animals used
for experimental purposes is under particular scrutiny. The vast majority of
laboratory animals are mice living in small cages that do not offer very much
variety. Moreover, the experimental procedure often takes very little time
compared to the time these animals have been bred to the desired age or are
being held available for animal experimentation. However, for the assessment of
animal welfare, the time spent waiting for an experiment or the time spent after
finishing an experiment has also to be taken into account. In addition to
experimental animals, many additional animals (e.g. for breeding and maintenance
of genetic lines, surplus animals) are related to animal experimentation and
usually face similar living conditions. Therefore, in terms of improving the
overall welfare of laboratory animals, there is not only a need for refinement
of experimental conditions but especially for improving living conditions
outside the experiment. The improvement of animal welfare thus depends to a
large extent on the housing and maintenance conditions of all animals related to
experimentation. Given the current state of animal welfare research there is
indeed a great potential for improving the overall welfare of laboratory
animals.
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Affiliation(s)
- Lars Lewejohann
- German Federal Institute for Risk Assessment (BfR), German Centre for the Protection of Laboratory Animals (Bf3R), Berlin, Germany.,Institute of Animal Welfare, Animal Behavior and Laboratory Animal Science, Freie Universität Berlin, Germany
| | - Kerstin Schwabe
- Department of Neurosurgery, Hannover Medical School, Germany
| | - Christine Häger
- Institute for Laboratory Animal Science, Hannover Medical School, Germany
| | - Paulin Jirkof
- Department Animal Welfare and 3Rs, University of Zurich, Switzerland
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13
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Bressers S, van den Elzen H, Gräwe C, van den Oetelaar D, Postma PHA, Schoustra SK. Policy driven changes in animal research practices: mapping researchers' attitudes towards animal-free innovations using the Netherlands as an example. Res Integr Peer Rev 2019; 4:8. [PMID: 31024742 PMCID: PMC6477718 DOI: 10.1186/s41073-019-0067-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 03/18/2019] [Indexed: 11/10/2022] Open
Abstract
Background Reducing the number of animals used in experiments has become a priority for the governments of many countries. For these reductions to occur, animal-free alternatives must be made more available and, crucially, must be embraced by researchers. Methods We conducted an international online survey for academics in the field of animal science (N = 367) to explore researchers’ attitudes towards the implementation of animal-free innovations. Through this survey, we address three key questions. The first question is whether scientists who use animals in their research consider governmental goals for animal-free innovations achievable and whether they would support such goals. Secondly, responders were asked to rank the importance of ten roadblocks that could hamper the implementation of animal-free innovations. Finally, responders were asked whether they would migrate (either themselves or their research) if increased animal research regulations in their country of residence restricted their research. Results While nearly half (40%) of the responders support governmental goals, the majority (71%) of researchers did not consider such goals achievable in their field within the near future. In terms of roadblocks for implementation of animal-free methods, ~ 80% of the responders considered ‘reliability’ as important, making it the most highly ranked roadblock. However, all other roadblocks were reported by most responders as somewhat important, suggesting that they must also be considered when addressing animal-free innovations. Importantly, a majority reported that they would consider migration to another country in response to a restrictive animal research policy. Thus, governments must consider the risk of researchers migrating to other institutes, states or countries, leading to a ‘brain-drain’ if policies are too strict or suitable animal-free alternatives are not available. Conclusion Our findings suggest that development and implementation of animal-free innovations are hampered by multiple factors. We outline three pillars concerning education, governmental influence and data sharing, the implementation of which may help to overcome these roadblocks to animal-free innovations. Electronic supplementary material The online version of this article (10.1186/s41073-019-0067-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- S Bressers
- Radboud Honours Academy, Radboud University, Nijmegen, the Netherlands
| | - H van den Elzen
- Radboud Honours Academy, Radboud University, Nijmegen, the Netherlands
| | - C Gräwe
- Radboud Honours Academy, Radboud University, Nijmegen, the Netherlands
| | | | - P H A Postma
- Radboud Honours Academy, Radboud University, Nijmegen, the Netherlands
| | - S K Schoustra
- Radboud Honours Academy, Radboud University, Nijmegen, the Netherlands
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Lotz C, Kiesewetter L, Schmid FF, Hansmann J, Walles H, Groeber-Becker F. Replacing the Draize eye test: Impedance spectroscopy as a 3R method to discriminate between all GHS categories for eye irritation. Sci Rep 2018; 8:15049. [PMID: 30301970 PMCID: PMC6177390 DOI: 10.1038/s41598-018-33118-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 09/21/2018] [Indexed: 11/09/2022] Open
Abstract
Highly invasive animal based test procedures for risk assessment such as the Draize eye test are under increasing criticism due to poor transferability for the human organism and animal-welfare concerns. However, besides all efforts, the Draize eye test is still not completely replaced by alternative animal-free methods. To develop an in vitro test to identify all categories of eye irritation, we combined organotypic cornea models based on primary human cells with an electrical readout system that measures the impedance of the test models. First, we showed that employing a primary human cornea epithelial cell based model is advantageous in native marker expression to the primary human epidermal keratinocytes derived models. Secondly, by employing a non-destructive measuring system based on impedance spectroscopy, we could increase the sensitivity of the test system. Thereby, all globally harmonized systems categories of eye irritation could be identified by repeated measurements over a period of 7 days. Based on a novel prediction model we achieved an accuracy of 78% with a reproducibility of 88.9% to determine all three categories of eye irritation in one single test. This could pave the way according to the 3R principle to replace the Draize eye test.
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Affiliation(s)
- C Lotz
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, Würzburg, 97070, Germany.
| | - L Kiesewetter
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, Würzburg, 97070, Germany
| | - F F Schmid
- Translational Center for Regenerative Therapies, Fraunhofer Institute for Silicate Research, Würzburg, 97070, Germany
| | - J Hansmann
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, Würzburg, 97070, Germany.,Translational Center for Regenerative Therapies, Fraunhofer Institute for Silicate Research, Würzburg, 97070, Germany
| | - H Walles
- Department Tissue Engineering & Regenerative Medicine (TERM), University Hospital Würzburg, Würzburg, 97070, Germany.,Translational Center for Regenerative Therapies, Fraunhofer Institute for Silicate Research, Würzburg, 97070, Germany
| | - F Groeber-Becker
- Translational Center for Regenerative Therapies, Fraunhofer Institute for Silicate Research, Würzburg, 97070, Germany
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