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Deng D, Hao T, Lu L, Yang M, Zeng Z, Lovell JF, Liu Y, Jin H. Applications of Intravital Imaging in Cancer Immunotherapy. Bioengineering (Basel) 2024; 11:264. [PMID: 38534538 DOI: 10.3390/bioengineering11030264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 02/20/2024] [Accepted: 03/06/2024] [Indexed: 03/28/2024] Open
Abstract
Currently, immunotherapy is one of the most effective treatment strategies for cancer. However, the efficacy of any specific anti-tumor immunotherapy can vary based on the dynamic characteristics of immune cells, such as their rate of migration and cell-to-cell interactions. Therefore, understanding the dynamics among cells involved in the immune response can inform the optimization and improvement of existing immunotherapy strategies. In vivo imaging technologies use optical microscopy techniques to visualize the movement and behavior of cells in vivo, including cells involved in the immune response, thereby showing great potential for application in the field of cancer immunotherapy. In this review, we briefly introduce the technical aspects required for in vivo imaging, such as fluorescent protein labeling, the construction of transgenic mice, and various window chamber models. Then, we discuss the elucidation of new phenomena and mechanisms relating to tumor immunotherapy that has been made possible by the application of in vivo imaging technology. Specifically, in vivo imaging has supported the characterization of the movement of T cells during immune checkpoint inhibitor therapy and the kinetic analysis of dendritic cell migration in tumor vaccine therapy. Finally, we provide a perspective on the challenges and future research directions for the use of in vivo imaging technology in cancer immunotherapy.
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Affiliation(s)
- Deqiang Deng
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Tianli Hao
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Lisen Lu
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Muyang Yang
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Zhen Zeng
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Jonathan F Lovell
- Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Yushuai Liu
- Department of Ophthalmology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Honglin Jin
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
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2
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Grambow E, Sorg H, Sorg CGG, Strüder D. Experimental Models to Study Skin Wound Healing with a Focus on Angiogenesis. Med Sci (Basel) 2021; 9:medsci9030055. [PMID: 34449673 PMCID: PMC8395822 DOI: 10.3390/medsci9030055] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 08/16/2021] [Accepted: 08/18/2021] [Indexed: 12/11/2022] Open
Abstract
A large number of models are now available for the investigation of skin wound healing. These can be used to study the processes that take place in a phase-specific manner under both physiological and pathological conditions. Most models focus on wound closure, which is a crucial parameter for wound healing. However, vascular supply plays an equally important role and corresponding models for selective or parallel investigation of microcirculation regeneration and angiogenesis are also described. In this review article, we therefore focus on the different levels of investigation of skin wound healing (in vivo to in virtuo) and the investigation of angiogenesis and its parameters.
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Affiliation(s)
- Eberhard Grambow
- Department of General, Visceral, Thoracic, Vascular and Transplantation Surgery, Rostock University Medical Center, 18057 Rostock, Germany
- Correspondence:
| | - Heiko Sorg
- Department of Health, University of Witten/Herdecke, Alfred-Herrhausen-Str. 50, 58455 Witten, Germany;
- Department of Plastic, Reconstructive, Aesthetic and Hand Surgery, Klinikum Westfalen, Am Knappschaftskrankenhaus 1, 44309 Dortmund, Germany
| | - Christian G. G. Sorg
- Chair of Management and Innovation in Health Care, Department of Management and Entrepreneurship, Faculty of Management, Economics and Society, Witten/Herdecke University, Alfred-Herrhausen-Straße 50, 58455 Witten, Germany;
| | - Daniel Strüder
- Department of Oto-Rhino-Laryngology, Head and Neck Surgery “Otto Körner”, Rostock University Medical Center, 18057 Rostock, Germany;
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3
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Rebling J, Ben‐Yehuda Greenwald M, Wietecha M, Werner S, Razansky D. Long-Term Imaging of Wound Angiogenesis with Large Scale Optoacoustic Microscopy. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2004226. [PMID: 34258153 PMCID: PMC8261523 DOI: 10.1002/advs.202004226] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 02/07/2021] [Indexed: 05/05/2023]
Abstract
Wound healing is a well-coordinated process, necessitating efficient formation of new blood vessels. Vascularization defects are therefore a major risk factor for chronic, non-healing wounds. The dynamics of mammalian tissue revascularization, vessel maturation, and remodeling remain poorly understood due to lack of suitable in vivo imaging tools. A label-free large-scale optoacoustic microscopy (LSOM) approach is developed for rapid, non-invasive, volumetric imaging of tissue regeneration over large areas spanning up to 50 mm with a depth penetration of 1.5 mm. Vascular networks in dorsal mouse skin and full-thickness excisional wounds are imaged with capillary resolution during the course of healing, revealing previously undocumented views of the angiogenesis process in an unperturbed wound environment. Development of an automatic analysis framework enables the identification of key features of wound angiogenesis, including vessel length, diameter, tortuosity, and angular alignment. The approach offers a versatile tool for preclinical research in tissue engineering and regenerative medicine, empowering label-free, longitudinal, high-throughput, and quantitative studies of the microcirculation in processes associated with normal and impaired vascular remodeling, and analysis of vascular responses to pharmacological interventions in vivo.
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Affiliation(s)
- Johannes Rebling
- Institute for Biomedical Engineering and Institute of Pharmacology and ToxicologyFaculty of MedicineUniversity of ZurichZurich8057Switzerland
- Institute for Biomedical EngineeringDepartment of Information Technology and Electrical EngineeringETH ZurichZurich8093Switzerland
| | | | - Mateusz Wietecha
- Institute of Molecular Health SciencesDepartment of BiologyETH ZurichZurich8093Switzerland
| | - Sabine Werner
- Institute of Molecular Health SciencesDepartment of BiologyETH ZurichZurich8093Switzerland
| | - Daniel Razansky
- Institute for Biomedical Engineering and Institute of Pharmacology and ToxicologyFaculty of MedicineUniversity of ZurichZurich8057Switzerland
- Institute for Biomedical EngineeringDepartment of Information Technology and Electrical EngineeringETH ZurichZurich8093Switzerland
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4
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Evaluation of a fluorescence endoscope in murine in-vivo auto-fluorescence glioma models. Ann Anat 2021; 237:151746. [PMID: 33894337 DOI: 10.1016/j.aanat.2021.151746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Revised: 04/03/2021] [Accepted: 04/03/2021] [Indexed: 11/23/2022]
Abstract
INTRODUCTION The value of extended and radical resection of high grade gliomas remains controversial, but the neurosurgical procedure is still vital for effective cancer treatment. Fluorescence guided surgery provides aggressive resection within the tumor margins even on microscopic levels. Aim of this study was to evaluate if a new developed fluorescence endoscope can improve intraoperative vision and tumor delineation. METHODS An autofluoresence C6 glioma cell line was established via GFP-transfection. These GFP-C6 glioma cells were transplanted both in a dorsal skinfold chamber of the mouse and orthotopically in a cranial window chamber of the mouse. After five days, tumors were examinated by intravital fluorescence microscopy, a standard fluorescence operation microscope and a fluorescence endoscope. Images were compared in terms of visualization, magnification and delineation of tumor cells from host tissue. RESULTS The fluorescence endoscope showed improved image quality and higher magnifications compared to the operation microscope. Even smallest tumor extensions were visualized by the fluorescence endoscope nearly reaching the quality of an intravital fluorescence microscope. CONCLUSIONS In summary better visualization can improve the intraoperative decision making of the surgeons. So endoscopic assistance can be seen as a promising tool for the fluorescence guided resection of high grade gliomas in the next years.
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TNF-α-Inhibition Improves the Biocompatibility of Porous Polyethylene Implants In Vivo. Tissue Eng Regen Med 2021; 18:297-303. [PMID: 33515166 PMCID: PMC8012447 DOI: 10.1007/s13770-020-00325-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 11/07/2020] [Accepted: 11/18/2020] [Indexed: 11/04/2022] Open
Abstract
Background:
To improve the biocompatibility of porous polyethylene (PPE) implants and expand their application range for reconstructive surgery in poorly vascularized environments, implants were coated with tumor necrosis factor α (TNFα) inhibitor Etanercept. While approved for systemic application, local application of the drug is a novel experimental approach. Microvascular and mechanical integration as well as parameters of inflammation were analyzed in vivo. Methods:
PPE implants were coated with Etanercept and extracellular matrix (ECM) components prior to implantation into dorsal skinfold chambers of C57BL/6 mice. Fluorescence microscopy analyses of angiogenesis and local inflammatory response were thrice performed in vivo over a period of 14 days to assess tissue integration and biocompatibility. Uncoated implants and ECM-coated implants served as controls. Results:
TNFα inhibition with Etanercept led to a reduced local inflammatory response: leukocyte-endothelial cell adherence was significantly lowered compared to both control groups (n = 6/group) on days 3 and 14, where the lowest values were reached: 3573.88 leukocytes/mm-2 ± 880.16 (uncoated implants) vs. 3939.09 mm-2 ± 623.34 (Matrigel only) vs. 637.98 mm-2 + 176.85 (Matrigel and Etanercept). Implant-coating with Matrigel alone and Matrigel and Etanercept led to significantly higher vessel densities 7 and 14 days vs. 3 days after implantation and compared to uncoated implants. Mechanical implant integration as measured by dynamic breaking strength did not differ after 14 days. Conclusion:
Our data show a reduced local inflammatory response to PPE implants after immunomodulatory coating with Etanercept in vivo, suggesting improved biocompatibility. Application of this tissue engineering approach is therefore warranted in models of a compromised host environment. Electronic supplementary material The online version of this article (10.1007/s13770-020-00325-w) contains supplementary material, which is available to authorized users.
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Schreiter JS, Beescho C, Kang J, Kursawe L, Moter A, Kikhney J, Langer S, Osla F, Wellner E, Kurow O. New model in diabetic mice to evaluate the effects of insulin therapy on biofilm development in wounds. GMS INTERDISCIPLINARY PLASTIC AND RECONSTRUCTIVE SURGERY DGPW 2020; 9:Doc06. [PMID: 33520591 PMCID: PMC7818390 DOI: 10.3205/iprs000150] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Objective: Diabetic patients suffer more frequently from biofilm-associated infections than normoglycemic patients. Well described in the literature is a relationship between elevated blood glucose levels in patients and the occurrence of biofilm-associated wound infections. Nevertheless, the underlying pathophysiological pathways leading to this increased infection vulnerability and its effects on biofilm development still need to be elucidated. We developed in our laboratory a model to allow the investigation of a biofilm-associated wound infection in diabetic mice under controlled insulin treatment. Methods: A dorsal skinfold chamber was used on 16 weeks old BKS.Cg-Dock7m +/+ Leprdb/J mice and a wound within the observation field of the dorsal skinfold chamber was created. These wounds were infected with Staphylococcus aureus ATCC 49230 (106 cells/mL). Simultaneously, we implanted implants for sustained insulin release into the ventral subcutaneous tissue (N=5 mice). Mice of the control group (N=5) were treated with sham implants. Serum glucose levels were registered before intervention and daily after the operation. Densitometrical analysis of the wound size was performed at day 0, 3, and 6 after intervention. Mice were sacrificed on day 6 and wound tissue was submitted to fluorescence in situ hybridization (FISH) and colony forming unit (CFU) analysis in addition to immunohistochemical staining to observe wound healing. Experiments were carried out in accordance with the National Institute of Health Guidelines for the Care and Use of Laboratory Animals (protocol number 05/19). Results: The insulin implants were able to reduce blood glucose levels in the mice. Hence, the diabetic mice in the intervention group were normoglycemic after the implantation. The combination with the dorsal skinfold chamber allowed for continuous, in vivo measurements of the infection development. Implantation of the insulin implant and the dorsal skinfold chamber was a tolerable condition for the diabetic mice. We succeeded to realize reproducible biofilm infections in the animals. Discussion: We developed a novel model to assess interactions between blood glucose level and S. aureus-induced biofilm-associated wound infections. The combination of the dorsal skinfold chamber model with a sustained insulin treatment has not been described so far. It allows a broad field of glucose and insulin dependent studies of infection.
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Affiliation(s)
| | - Christian Beescho
- Department of Orthopedics, Trauma and Plastic Surgery, University Hospital Leipzig, Germany
| | | | - Laura Kursawe
- MoKi Analytics GmbH, Berlin, Germany.,Biofilmzentrum, Department for Microbiology, Infectious Diseases and Immunology, Charité - Universitätsmedizin Berlin, Germany
| | - Annette Moter
- MoKi Analytics GmbH, Berlin, Germany.,Biofilmzentrum, Department for Microbiology, Infectious Diseases and Immunology, Charité - Universitätsmedizin Berlin, Germany
| | - Judith Kikhney
- MoKi Analytics GmbH, Berlin, Germany.,Biofilmzentrum, Department for Microbiology, Infectious Diseases and Immunology, Charité - Universitätsmedizin Berlin, Germany
| | - Stefan Langer
- Department of Orthopedics, Trauma and Plastic Surgery, University Hospital Leipzig, Germany
| | | | | | - Olga Kurow
- Department of Orthopedics, Trauma and Plastic Surgery, University Hospital Leipzig, Germany
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7
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Jia W, Burns JM, Villantay B, Tang JC, Vankayala R, Lertsakdadet B, Choi B, Nelson JS, Anvari B. Intravital Vascular Phototheranostics and Real-Time Circulation Dynamics of Micro- and Nanosized Erythrocyte-Derived Carriers. ACS APPLIED MATERIALS & INTERFACES 2020; 12:275-287. [PMID: 31820920 PMCID: PMC7028219 DOI: 10.1021/acsami.9b18624] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Erythrocyte-based carriers can serve as theranostic platforms for delivery of imaging and therapeutic payloads. Engineering these carriers at micro- or nanoscales makes them potentially useful for broad clinical applications ranging from vascular diseases to tumor theranostics. Longevity of these carriers in circulation is important in delivering a sufficient amount of their payloads to the target. We have investigated the circulation dynamics of micro (∼4.95 μm diameter) and nano (∼91 nm diameter) erythrocyte-derived carriers in real time using near-infrared fluorescence imaging, and evaluated the effectiveness of such carrier systems in mediating photothermolysis of cutaneous vasculature in mice. Fluorescence emission half-lives of micro- and nanosized carriers in response to a single intravenous injection were ∼49 and ∼15 min, respectively. A single injection of microsized carriers resulted in a 3-fold increase in signal-to-noise ratio that remained nearly persistent over 1 h of imaging time. Our results also suggest that a second injection of the carriers 7 days later can induce a transient inflammatory response, as manifested by the apparent leakage of the carriers into the perivascular tissue. The administration of the carriers into the mice vasculature reduced the threshold laser fluence to induce photothermolysis of blood vessels from >65 to 20 J/cm2. We discuss the importance of membrane physicochemical and mechanical characteristics in engineering erythrocyte-derived carriers and considerations for their clinical translation.
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Affiliation(s)
- Wangcun Jia
- Beckman Laser Institute and Medical Clinic, Department of Surgery, University of California, Irvine, Irvine, CA, 92617
| | - Joshua M. Burns
- Department of Bioengineering, University of California, Riverside, Riverside, CA, 92521
| | - Betty Villantay
- Beckman Laser Institute and Medical Clinic, Department of Surgery, University of California, Irvine, Irvine, CA, 92617
| | - Jack C. Tang
- Department of Bioengineering, University of California, Riverside, Riverside, CA, 92521
| | | | - Ben Lertsakdadet
- Beckman Laser Institute and Medical Clinic, Department of Surgery, University of California, Irvine, Irvine, CA, 92617
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, 92697
| | - Bernard Choi
- Beckman Laser Institute and Medical Clinic, Department of Surgery, University of California, Irvine, Irvine, CA, 92617
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, 92697
- Edwards Life Sciences Center for Advanced Cardiovascular Technology, University of California, Irvine, Irvine, CA 92697
| | - J. Stuart Nelson
- Beckman Laser Institute and Medical Clinic, Department of Surgery, University of California, Irvine, Irvine, CA, 92617
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, 92697
| | - Bahman Anvari
- Department of Bioengineering, University of California, Riverside, Riverside, CA, 92521
- Corresponding Author
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8
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Angiogenic effects of mesenchymal stem cells in combination with different scaffold materials. Microvasc Res 2020; 127:103925. [DOI: 10.1016/j.mvr.2019.103925] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 08/14/2019] [Accepted: 09/11/2019] [Indexed: 12/26/2022]
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9
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Hertz L, Ruppenthal S, Simionato G, Quint S, Kihm A, Abay A, Petkova-Kirova P, Boehm U, Weissgerber P, Wagner C, Laschke MW, Kaestner L. The Evolution of Erythrocytes Becoming Red in Respect to Fluorescence. Front Physiol 2019; 10:753. [PMID: 31275166 PMCID: PMC6593091 DOI: 10.3389/fphys.2019.00753] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 05/31/2019] [Indexed: 11/13/2022] Open
Abstract
Very young red blood cells, namely reticulocytes, can be quite easily recognized and labeled by cluster of differentiation antibodies (CD71, transferrin receptor) or by staining remnant RNA with thiazol orange. In contrast, age specific erythrocyte labeling is more difficult in later periods of their life time. While erythrocytes contain band 4.1 protein, a molecular clock, so far it has not been possible to read this clock on individual cells. One concept to track erythrocytes during their life time is to mark them when they are young, either directly in vivo or ex vivo followed by a transfusion. Several methods like biotinylation, use of isotopes or fluorescent labeling have proved to be useful experimental approaches but also have several inherent disadvantages. Genetic engineering of mice provides additional options to express fluorescent proteins in erythrocytes. To allow co-staining with popular green fluorescent dyes like Fluo-4 or other fluorescein-based dyes, we bred a mouse line expressing a tandem red fluorescent protein (tdRFP). Within this Brief Research Report, we provide the initial characterisation of this mouse line and show application examples ranging from transfusion experiments and intravital microscopy to multicolour flow cytometry and confocal imaging. We provide a versatile new tool for erythrocyte research and discuss a range of experimental opportunities to study membrane processes and other aspects of erythrocyte development and aging with help of these animals.
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Affiliation(s)
- Laura Hertz
- Institute for Molecular and Cell Biology, Saarland University, Homburg, Germany
| | - Sandra Ruppenthal
- Institute for Molecular and Cell Biology, Saarland University, Homburg, Germany
| | - Greta Simionato
- Theoretical Medicine and Biosciences, Saarland University, Homburg, Germany.,Experimental Physics, Saarland University, Saarbrücken, Germany
| | - Stephan Quint
- Experimental Physics, Saarland University, Saarbrücken, Germany
| | - Alexander Kihm
- Experimental Physics, Saarland University, Saarbrücken, Germany
| | - Asena Abay
- Experimental Physics, Saarland University, Saarbrücken, Germany
| | | | - Ulrich Boehm
- Center for Molecular Signaling (PZMS), Institute for Pharmacology, Saarland University, Homburg, Germany
| | - Petra Weissgerber
- Center for Molecular Signaling (PZMS), Institute for Pharmacology, Saarland University, Homburg, Germany
| | - Christian Wagner
- Experimental Physics, Saarland University, Saarbrücken, Germany.,Physics and Materials Science Research Unit, University of Luxembourg, Luxembourg City, Luxembourg
| | - Matthias W Laschke
- Institute for Clinical and Experimental Surgery, Saarland University, Homburg, Germany
| | - Lars Kaestner
- Theoretical Medicine and Biosciences, Saarland University, Homburg, Germany.,Experimental Physics, Saarland University, Saarbrücken, Germany
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10
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De Niz M, Meehan GR, Brancucci NM, Marti M, Rotureau B, Figueiredo LM, Frischknecht F. Intravital imaging of host-parasite interactions in skin and adipose tissues. Cell Microbiol 2019; 21:e13023. [PMID: 30825872 PMCID: PMC6590052 DOI: 10.1111/cmi.13023] [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: 11/09/2018] [Revised: 02/06/2019] [Accepted: 02/08/2019] [Indexed: 12/20/2022]
Abstract
Intravital microscopy allows the visualisation of how pathogens interact with host cells and tissues in living animals in real time. This method has enabled key advances in our understanding of host-parasite interactions under physiological conditions. A combination of genetics, microscopy techniques, and image analysis have recently facilitated the understanding of biological phenomena in living animals at cellular and subcellular resolution. In this review, we summarise findings achieved by intravital microscopy of the skin and adipose tissues upon infection with various parasites, and we present a view into possible future applications of this method.
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Affiliation(s)
- Mariana De Niz
- Institute of Cell Biology, Heussler GroupUniversity of BernBernSwitzerland
- Wellcome Centre for Integrative ParasitologyUniversity of GlasgowGlasgowUK
| | - Gavin R. Meehan
- Wellcome Centre for Integrative ParasitologyUniversity of GlasgowGlasgowUK
| | - Nicolas M.B. Brancucci
- Malaria Gene Regulation Unit, Department of Medical Parasitology and Infection BiologySwiss Tropical and Public Health InstituteBaselSwitzerland
- University of BaselBaselSwitzerland
| | - Matthias Marti
- Wellcome Centre for Integrative ParasitologyUniversity of GlasgowGlasgowUK
| | - Brice Rotureau
- Trypanosome Transmission Group, Trypanosome Cell Biology Unit, Department of Parasites and Insect Vectors, INSERM U1201Institut PasteurParisFrance
| | - Luisa M. Figueiredo
- Faculdade de Medicina, Instituto de Medicina Molecular João Lobo AntunesUniversidade de LisboaLisbonPortugal
| | - Friedrich Frischknecht
- Integrative Parasitology, Centre for Infectious DiseasesUniversity of Heidelberg Medical SchoolHeidelbergGermany
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11
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Regelin N, Heyder S, Laschke MW, Hadizamani Y, Borgmann M, Moehrlen U, Schramm R, Bals R, Menger MD, Hamacher J. A murine model to study vasoreactivity and intravascular flow in lung isograft microvessels. Sci Rep 2019; 9:5170. [PMID: 30914786 PMCID: PMC6435642 DOI: 10.1038/s41598-019-41590-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Accepted: 02/20/2019] [Indexed: 11/09/2022] Open
Abstract
Intravital microscopy of orthotopic lung tissue is technically demanding, especially for repeated investigations. Therefore, we have established a novel approach, which allows non-invasive repetitive in vivo microscopy of ectopic lung tissue in dorsal skinfold chambers. Syngeneic subpleural peripheral lung tissue and autologous endometrium (control) were transplanted onto the striated muscle within dorsal skinfold chambers of C57BL/6 mice. Grafts were analysed by intravital fluorescence microscopy over 14 days. Angiogenesis occurred in the grafts on day 3, as indicated by sinusoidal microvessels on the grafts’ edges with very slow blood flow, perifocal oedema, and haemorrhage. By day 10, lung transplants were completely revascularized, exhibited a dense network of microvessels with irregular diameters, chaotic angioarchitecture, and high blood flow. Compared to lung tissue, endometrial grafts contained a structured, glomerulus-like vessel architecture with lower blood flow. Despite missing ventilation, hypoxic vasoconstriction of the lung tissue arterioles occurred. In contrast, endometrium tissue arterioles dilated during hypoxia and constricted in hyperoxia. This demonstrates that ectopic lung grafts keep their ability for organ-specific hypoxic vasoconstriction. These findings indicate that our approach is suitable for repetitive in vivo pulmonary microcirculation analyses. The high blood flow and hypoxia-induced vasoconstriction in lung grafts suggest a physiological intrinsic vasoregulation independent of the recipient tissue.
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Affiliation(s)
- Nora Regelin
- Department of Internal Medicine V - Pulmonology, Allergology, Respiratory Intensive Care Medicine, Saarland University Hospital, 66424, Homburg, Germany.,Institute for Clinical & Experimental Surgery, Faculty of Medicine, Saarland University, 66421, Homburg, Germany
| | - Susanne Heyder
- Department of Internal Medicine V - Pulmonology, Allergology, Respiratory Intensive Care Medicine, Saarland University Hospital, 66424, Homburg, Germany.,Institute for Clinical & Experimental Surgery, Faculty of Medicine, Saarland University, 66421, Homburg, Germany.,Mediclin Albert Schweitzer Clinic, Pneumology, 78126, Königsfeld, Germany
| | - Matthias W Laschke
- Institute for Clinical & Experimental Surgery, Faculty of Medicine, Saarland University, 66421, Homburg, Germany
| | - Yalda Hadizamani
- Pneumology, Clinic for General Internal Medicine, Lindenhofspital Bern, 3012, Bern, Switzerland.,Lungen-und Atmungsstiftung, Bern, 3012, Bern, Switzerland
| | - Michèle Borgmann
- Pneumology, Clinic for General Internal Medicine, Lindenhofspital Bern, 3012, Bern, Switzerland.,Lungen-und Atmungsstiftung, Bern, 3012, Bern, Switzerland
| | - Ueli Moehrlen
- Lungen-und Atmungsstiftung, Bern, 3012, Bern, Switzerland.,Pediatric Surgery, University Children's Hospital Zurich, 8032, Zurich, Switzerland
| | - René Schramm
- Institute for Clinical & Experimental Surgery, Faculty of Medicine, Saarland University, 66421, Homburg, Germany.,Heart and Diabetes Centre North Rhine-Westphalia, University Hospital of the Ruhr University of Bochum, 32545, Bad Oeynhausen, Germany
| | - Robert Bals
- Department of Internal Medicine V - Pulmonology, Allergology, Respiratory Intensive Care Medicine, Saarland University Hospital, 66424, Homburg, Germany
| | - Michael D Menger
- Institute for Clinical & Experimental Surgery, Faculty of Medicine, Saarland University, 66421, Homburg, Germany
| | - Jürg Hamacher
- Department of Internal Medicine V - Pulmonology, Allergology, Respiratory Intensive Care Medicine, Saarland University Hospital, 66424, Homburg, Germany. .,Institute for Clinical & Experimental Surgery, Faculty of Medicine, Saarland University, 66421, Homburg, Germany. .,Pneumology, Clinic for General Internal Medicine, Lindenhofspital Bern, 3012, Bern, Switzerland. .,Lungen-und Atmungsstiftung, Bern, 3012, Bern, Switzerland.
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12
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Mussawy H, Viezens L, Schroeder M, Hettenhausen S, Sündermann J, Wellbrock J, Kossow K, Schaefer C. The bone microenvironment promotes tumor growth and tissue perfusion compared with striated muscle in a preclinical model of prostate cancer in vivo. BMC Cancer 2018; 18:979. [PMID: 30326868 PMCID: PMC6192198 DOI: 10.1186/s12885-018-4905-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 10/05/2018] [Indexed: 12/21/2022] Open
Abstract
Background Prostate cancer-related morbidity is associated with its preferential spread to the bone. Although the molecular interactions between the bone microenvironment and cancer cells have been researched extensively, the relevance of the microvascular properties of prostate cancer bone metastases remains largely unknown. Most preclinical studies focusing on microvascular analyses are based on heterotopic tumor implantation, whereas the impact of the microenvironment on site-specific growth behavior and angiogenesis is rarely addressed. Methods The microvascular changes associated with tumor growth in bone and soft tissue were characterized by implanting single cell suspensions of LnCap, Du145, and Pc3 cells into the femur (femur window) or striated muscle (dorsal skinfold chamber) of NSG mice. Tumor growth and the local microvasculature were analyzed for 21 days using intravital fluorescence microscopy. Results The results showed a higher engraftment of tumor cells in bone than in striated muscle associated with accelerated growth of LnCap cells and Pc3 cells. Permeability, blood flow, and tissue perfusion rates were greater in bone than in striated muscle. Du145 cells showed similar growth behavior in both tissues with similar vascular properties. The bone microenvironment facilitated tumor engraftment and growth. Increased microvascular density in striated muscle led to a higher tumor burden during early growth, whereas the increased perfusion promoted later prostate cancer growth in bone. Conclusions Monitoring prostate cancer microcirculation in bone and soft tissue may be useful to evaluate the organ-specific efficacy of new treatments. Electronic supplementary material The online version of this article (10.1186/s12885-018-4905-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Haider Mussawy
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany.
| | - Lennart Viezens
- Department of Trauma, Orthopaedic, and Plastic Surgery, University Medical Center Goettingen, Goettingen, Germany
| | - Malte Schroeder
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany.,Department of Spine Surgery, Klinikum Bad Bramstedt, 24576, Bad Bramstedt, Germany
| | - Svenja Hettenhausen
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany
| | - Jördis Sündermann
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany
| | - Jasmin Wellbrock
- Department of Hematology, Oncology and Stem Cell Transplantation with Section Pneumology, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany
| | - Kai Kossow
- Center of Psychosocial Medicine, Institute and Policlinics of Medical Psychology, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany
| | - Christian Schaefer
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany.,Department of Spine Surgery, Klinikum Bad Bramstedt, 24576, Bad Bramstedt, Germany
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13
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Desmet CM, Préat V, Gallez B. Nanomedicines and gene therapy for the delivery of growth factors to improve perfusion and oxygenation in wound healing. Adv Drug Deliv Rev 2018; 129:262-284. [PMID: 29448035 DOI: 10.1016/j.addr.2018.02.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 01/25/2018] [Accepted: 02/03/2018] [Indexed: 12/16/2022]
Abstract
Oxygen plays a key role in wound healing, and hypoxia is a major cause of wound healing impairment; therefore, treatments to improve hemodynamics and increase wound oxygenation are of particular interest for the treatment of chronic wounds. This article describes the roles of oxygen and angiogenesis in wound healing as well as the tools used to evaluate tissue oxygenation and perfusion and then presents a review of nanomedicines and gene therapies designed to improve perfusion and oxygenation and accelerate wound healing.
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14
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Mussawy H, Viezens L, Hauenherm G, Schroeder M, Schaefer C. In vivo functional and morphological characterization of bone and striated muscle microcirculation in NSG mice. PLoS One 2017; 12:e0183186. [PMID: 28800593 PMCID: PMC5553939 DOI: 10.1371/journal.pone.0183186] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2017] [Accepted: 07/30/2017] [Indexed: 11/18/2022] Open
Abstract
Organ-specific microcirculation plays a central role in tumor growth, tumor cell homing, tissue engineering, and wound healing. Mouse models are widely used to study these processes; however, these mouse strains often possess unique microhemodynamic parameters, making it difficult to directly compare experiments. The full functional characterization of bone and striated muscle microcirculatory parameters in non-obese diabetic-severe combined immunodeficiency/y-chain; NOD-Prkds IL2rg (NSG) mice has not yet been reported. Here, we established either a dorsal skinfold chamber or femur window in NSG mice (n = 23), allowing direct analysis of microcirculatory parameters in vivo by intravital fluorescence microscopy at 7, 14, 21, and 28 days after chamber preparation. Organ-specific differences were observed. Bone had a significantly lower vessel density but a higher vessel diameter than striated muscle. Bone also showed higher effective vascular permeability than striated muscle. The centerline velocity values were similar in the femur window and dorsal skinfold chamber, with a higher volumetric blood flow in bone. Interestingly, bone and striated muscle showed similar tissue perfusion rates. Knowledge of physiological microhemodynamic values of bone and striated muscle in NSG mice makes it possible to analyze pathophysiological processes at these anatomic sites, such as tumor growth, tumor metastasis, and tumor microcirculation, as well as the response to therapeutic agents.
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Affiliation(s)
- Haider Mussawy
- Department of Orthopaedic Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
- * E-mail:
| | - Lennart Viezens
- Department of Orthopaedic Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
- Department of Trauma-, Hand-, and Reconstructive Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
| | - Gerrit Hauenherm
- Department of Orthopaedic Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
| | - Malte Schroeder
- Department of Orthopaedic Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
- Department of Spine Surgery, Klinikum Bad Bramstedt, Bad Bramstedt, Germany
| | - Christian Schaefer
- Department of Orthopaedic Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
- Department of Spine Surgery, Klinikum Bad Bramstedt, Bad Bramstedt, Germany
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15
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Schreiter J, Meyer S, Schmidt C, Schulz RM, Langer S. Dorsal skinfold chamber models in mice. GMS INTERDISCIPLINARY PLASTIC AND RECONSTRUCTIVE SURGERY DGPW 2017; 6:Doc10. [PMID: 28706772 PMCID: PMC5506728 DOI: 10.3205/iprs000112] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Accepted: 12/06/2016] [Indexed: 01/07/2023]
Abstract
Background/purpose: The use of dorsal skinfold chamber models has substantially improved the understanding of micro-vascularisation in pathophysiology over the last eight decades. It allows in vivo pathophysiological studies of vascularisation over a continuous period of time. The dorsal skinfold chamber is an attractive technique for monitoring the vascularisation of autologous or allogenic transplants, wound healing, tumorigenesis and compatibility of biomaterial implants. To further reduce the animals’ discomfort while carrying the dorsal skinfold chamber, we developed a smaller chamber (the Leipzig Dorsal Skinfold Chamber) and summarized the commercial available chamber models. In addition we compared our model to the common chamber. Methods: The Leipzig Dorsal Skinfold Chamber was applied to 66 C57Bl/6 female mice with a mean weight of 22 g. Angiogenesis within the dorsal skinfold chamber was evaluated after injection of fluorescein isothiocyanate dextran with an Axio Scope microscope. The mean vessel density within the dorsal skinfold chamber was assessed over a period of 21 days at five different time points. The gained data were compared to previous results using a bigger and heavier dorsal skinfold model in mice. A PubMed and a patent search were performed and all papers related to “dorsal skinfold chamber” from 1st of January 2006 to 31st of December 2015 were evaluated regarding the dorsal skinfold chamber models and their technical improvements. The main models are described and compared to our titanium Leipzig Dorsal Skinfold Chamber model. Results: The Leipzig Dorsal Skinfold Chamber fulfils all requirements of continuous in vivo models known from previous chamber models while reducing irritation to the mice. Five different chamber models have been identified showing substantial regional diversity. The newly elaborated titanium dorsal skinfold chamber may replace the pre-existing titanium chamber model used in Germany so far, as it is smaller and lighter than the former ones. However, the new chamber does not reach the advantages of already existing chamber models used in Asia and the US, which are smaller and lighter. Conclusion: Elaborating a smaller and lighter dorsal skinfold chamber allows research studies on smaller animals and reduces the animals’ discomfort while carrying the chamber. Greater research exchange should be done to spread the use of smaller and lighter chamber models.
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Affiliation(s)
- Jeannine Schreiter
- Department of Plastic, Aesthetic and Special Hand Surgery, Clinic and Polyclinic for Orthopaedics, Traumatology and Plastic Surgery, University Hospital Leipzig, Germany
| | - Sophia Meyer
- Department of Plastic, Aesthetic and Special Hand Surgery, Clinic and Polyclinic for Orthopaedics, Traumatology and Plastic Surgery, University Hospital Leipzig, Germany
| | - Christian Schmidt
- Department of Plastic, Aesthetic and Special Hand Surgery, Clinic and Polyclinic for Orthopaedics, Traumatology and Plastic Surgery, University Hospital Leipzig, Germany.,Centre for Biotechnology and Biomedicine, Leipzig, Germany
| | - Ronny M Schulz
- Department of Plastic, Aesthetic and Special Hand Surgery, Clinic and Polyclinic for Orthopaedics, Traumatology and Plastic Surgery, University Hospital Leipzig, Germany.,Centre for Biotechnology and Biomedicine, Leipzig, Germany
| | - Stefan Langer
- Department of Plastic, Aesthetic and Special Hand Surgery, Clinic and Polyclinic for Orthopaedics, Traumatology and Plastic Surgery, University Hospital Leipzig, Germany
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16
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Senger S, Sperling J, Oberkircher B, Schilling MK, Kollmar O, Menger MD, Ziemann C. Portal branch ligation does not counteract the inhibiting effect of temsirolimus on extrahepatic colorectal metastatic growth. Clin Exp Metastasis 2017. [PMID: 28631253 DOI: 10.1007/s10585-017-9852-z] [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] [Indexed: 11/26/2022]
Abstract
The mTor-inhibitor temsirolimus (TEM) has potent anti-tumor activities on extrahepatic colorectal metastases. Treatment of patients with advanced disease may require portal branch ligation (PBL). While PBL can induce intrahepatic tumor growth, the effect of PBL on extrahepatic metastases under TEM treatment is unknown. Therefore, we analyzed the effects of TEM treatment on extrahepatic metastases during PBL-associated liver regeneration. GFP-transfected CT26.WT colorectal cancer cells were implanted into the dorsal skinfold chamber of BALB/c-mice. Mice were randomized to four groups (n = 8). One was treated daily with TEM (1.5 mg/kg), PBS-treated animals served as controls. Another group underwent PBL of the left liver lobe and received daily TEM treatment. Animals with PBL and PBS treatment served as controls. Tumor vascularization and growth as well as tumor cell migration, proliferation and apoptosis were studied over 14 days. In non-PBL animals TEM treatment inhibited tumor cell proliferation as well as vascularization and growth of the extrahepatic metastases. PBL did not influence tumor cell engraftment, vascularization and metastatic growth. Of interest, TEM treatment significantly reduced tumor cell engraftment, neovascularization and metastatic groth also after PBL. PBL does not counteract the inhibiting effect of TEM on extrahepatic colorectal metastatic growth.
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Affiliation(s)
- Sebastian Senger
- Institute for Clinical and Experimental Surgery, Saarland University, Homburg/Saar, Germany
- Department of Neurosurgery, Saarland University, Homburg/Saar, Germany
| | - Jens Sperling
- Institute for Clinical and Experimental Surgery, Saarland University, Homburg/Saar, Germany
- Department of General, Visceral and Pediatric Surgery, University Medical Center Göttingen, Göttingen, Germany
| | - Barbara Oberkircher
- Institute for Clinical and Experimental Surgery, Saarland University, Homburg/Saar, Germany
| | - Martin K Schilling
- Department of General, Visceral, Vascular and Pediatric Surgery, Saarland University, Homburg/Saar, Germany
- Klinik St. Anna Ärztehaus Lützelmatt, Lucerne, Switzerland
| | - Otto Kollmar
- Department of General, Visceral, Vascular and Pediatric Surgery, Saarland University, Homburg/Saar, Germany
- Department of General and Visceral Surgery, Dr. Horst Schmidt Kliniken, Wiesbaden, Germany
| | - Michael D Menger
- Institute for Clinical and Experimental Surgery, Saarland University, Homburg/Saar, Germany
| | - Christian Ziemann
- Institute for Clinical and Experimental Surgery, Saarland University, Homburg/Saar, Germany.
- Department of General, Visceral, Vascular and Pediatric Surgery, Saarland University, Homburg/Saar, Germany.
- Department of Cardiovascular Surgery, University Heart Center, University Medical Center, University of Freiburg, Freiburg, Germany.
- Department of General, Visceral, Vascular and Pediatric Surgery and Institute for Clinical and Experimental Surgery, Saarland Medical School, Saarland University, Kirrberger Straße 1, 66424, Homburg/Saar, Germany.
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17
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Hussain T, Schneider M, Summer B, Strieth S. Pre-operative in vitro fibroblast coating of porous polyethylene compound grafts - Cell survival in vivo and effects on biocompatibility. Biomed Mater Eng 2017; 27:237-49. [PMID: 27567778 DOI: 10.3233/bme-161579] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND Key factors for successful porous polyethylene (PPE) implantation are rapid vascularization and low inflammatory response. Dermal fibroblasts produce a variety of pro-angiogenic and immunmodulatory factors. OBJECTIVE The aim of this tissue engineering study was to investigate whether coating PPE implants with dermal fibroblasts in vitro is sustainable in vivo and whether the kinetics of blood vessel ingrowth and immunological responses are hereby affected. METHODS PPE implants were cultured with syngeneic GFP-transfected dermal fibroblasts. Cells on the biomaterial were quantified before implantation into dorsal skinfold chamber preparations of C57Bl/6 mice. Uncoated implants served as controls. Angiogenic activity and leukocyte-endothelial cell interactions were repeatedly analyzed. After 10 days, mechanical integration was measured and surviving fluorescently labeled fibroblasts were quantified. Expression of inflammatory cytokines was assessed by quantitative real time-reverse transcription PCR. RESULTS PPE implants were successfully coated with dermal fibroblasts in vitro and 69% of the cells were still detectable at the end of observation. Angiogenic parameters increased during the observation period in both groups. IL-2, IL17A and IL-10 tended to be increased in coated implants, but did not affect leukocyte-endothelial cell interactions. CONCLUSIONS Dermal fibroblast-coating of porous polyethylene implants is feasible and sustainable in vivo. Alone it does not improve biocompatibility but may be beneficial in combination with specific growth factor supplements.
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Affiliation(s)
- Timon Hussain
- Walter-Brendel-Center for Experimental Medicine (WBex), University of Munich (LMU), Marchioninistr. 27, 81377 Munich, Germany.,Department of Otorhinolaryngology, Head and Neck Surgery, University of Essen, Hufelandstr. 55, 45147 Essen, Germany
| | - Manuela Schneider
- Walter-Brendel-Center for Experimental Medicine (WBex), University of Munich (LMU), Marchioninistr. 27, 81377 Munich, Germany
| | - Burkhard Summer
- Department of Dermatology, University of Munich (LMU), Frauenlobstr. 9-11, 80337 Munich, Germany
| | - Sebastian Strieth
- Walter-Brendel-Center for Experimental Medicine (WBex), University of Munich (LMU), Marchioninistr. 27, 81377 Munich, Germany.,Department of Otorhinolaryngology, University Medical Center Mainz, Langenbeckstr. 1, 55131 Mainz, Germany
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18
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Heun Y, Hildebrand S, Heidsieck A, Gleich B, Anton M, Pircher J, Ribeiro A, Mykhaylyk O, Eberbeck D, Wenzel D, Pfeifer A, Woernle M, Krötz F, Pohl U, Mannell H. Targeting of Magnetic Nanoparticle-coated Microbubbles to the Vascular Wall Empowers Site-specific Lentiviral Gene Delivery in vivo. Theranostics 2017; 7:295-307. [PMID: 28042335 PMCID: PMC5197065 DOI: 10.7150/thno.16192] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Accepted: 09/13/2016] [Indexed: 12/13/2022] Open
Abstract
In the field of vascular gene therapy, targeting systems are promising advancements to improve site-specificity of gene delivery. Here, we studied whether incorporation of magnetic nanoparticles (MNP) with different magnetic properties into ultrasound sensitive microbubbles may represent an efficient way to enable gene targeting in the vascular system after systemic application. Thus, we associated novel silicon oxide-coated magnetic nanoparticle containing microbubbles (SO-Mag MMB) with lentiviral particles carrying therapeutic genes and determined their physico-chemical as well as biological properties compared to MMB coated with polyethylenimine-coated magnetic nanoparticles (PEI-Mag MMB). While there were no differences between both MMB types concerning size and lentivirus binding, SO-Mag MMB exhibited superior characteristics regarding magnetic moment, magnetizability as well as transduction efficiency under static and flow conditions in vitro. Focal disruption of lentiviral SO-Mag MMB by ultrasound within isolated vessels exposed to an external magnetic field decisively improved localized VEGF expression in aortic endothelium ex vivo and enhanced the angiogenic response. Using the same system in vivo, we achieved a highly effective, site-specific lentiviral transgene expression in microvessels of the mouse dorsal skin after arterial injection. Thus, we established a novel lentiviral MMB technique, which has great potential towards site-directed vascular gene therapy.
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19
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Damestani Y, Galan-Hoffman DE, Ortiz D, Cabrales P, Aguilar G. Inflammatory response to implantation of transparent nanocrystalline yttria-stabilized zirconia using a dorsal window chamber model. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2016; 12:1757-1763. [PMID: 27133190 DOI: 10.1016/j.nano.2016.04.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 03/10/2016] [Accepted: 04/14/2016] [Indexed: 10/21/2022]
Abstract
The long-range goal of the windows to the brain (WttB) is to improve patient care by providing a technique for delivery and/or collection of light into/from the brain, on demand, over large areas, and on a chronically-recurring basis without the need for repeated craniotomies. To evaluate the potential of nanocrystalline yttria-stabilized-zirconia (nc-YSZ) cranial implant for optical therapy and imaging, in vivo biocompatibility was studied using the dorsal window chamber model in comparison with control (no implant) and commercially available cranial implant materials (PEEK and PEKK). The host tissue response to implant was characterized by using transillumination and fluorescent microscopy to measure leukocyte adhesion, blood vessel diameter, blood flow rate, and vascular permeability over two weeks. The results indicated the lack of inflammatory reaction of the host tissue to nc-YSZ at the microscopic level, suggesting that nc-YSZ is a good alternative material for cranial implants.
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Affiliation(s)
- Yasaman Damestani
- Department of Bioengineering, University of California Riverside, Riverside, CA, USA
| | | | - Daniel Ortiz
- Department of Bioengineering, University of California San Diego, La Jolla, CA, USA
| | - Pedro Cabrales
- Department of Bioengineering, University of California San Diego, La Jolla, CA, USA
| | - Guillermo Aguilar
- Department of Mechanical Engineering, University of California Riverside, Riverside, CA, USA.
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20
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Lossi L, D’Angelo L, De Girolamo P, Merighi A. Anatomical features for an adequate choice of experimental animal model in biomedicine: II. Small laboratory rodents, rabbit, and pig. Ann Anat 2016; 204:11-28. [DOI: 10.1016/j.aanat.2015.10.002] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 10/01/2015] [Accepted: 10/05/2015] [Indexed: 01/24/2023]
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21
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Senger S, Kollmar O, Menger MD, Rupertus K. Darbepoetin-α Promotes Cell Proliferation in Established Extrahepatic Colorectal Tumors after Major Hepatectomy. Eur Surg Res 2015; 56:49-60. [PMID: 26678394 DOI: 10.1159/000442384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Accepted: 11/11/2015] [Indexed: 11/19/2022]
Abstract
BACKGROUND The glycoprotein hormone erythropoietin and its analogue darbepoetin-α (DPO) have been shown to reduce the risk of acute liver failure after major hepatectomy. However, previous experimental studies have also shown that DPO significantly enhances neovascularization and tumor cell proliferation in established colorectal liver metastasis in hepatectomized and nonhepatectomized mice. The present study now analyzes whether DPO influences cell proliferation and migration as well as vascularization and growth of established colorectal metastasis at extrahepatic sites after major hepatectomy. METHODS GFP-transfected CT26.WT colorectal cancer cells were implanted into dorsal skinfold chambers of syngeneic BALB/c mice. Five days after tumor cell implantation, the animals received a single dose of DPO (10 µg/kg body weight) or phosphate-buffered saline solution (PBS) intravenously. Additional animals received a 70% hepatectomy and DPO or PBS treatment. Tumor vascularization and growth as well as tumor cell migration, proliferation and apoptosis were studied repetitively over 14 days using intravital fluorescence microscopy, histology and immunohistochemistry. RESULTS DPO did not influence tumor cell migration and apoptosis. In addition, DPO did not stimulate tumor cell infiltration or vascularization; however, significantly increased tumor cell proliferation was detected in hepatectomized animals. CONCLUSION DPO increases cell proliferation in established extrahepatic colorectal metastases after major hepatectomy. Thus, DPO may not be recommended to stimulate regeneration of the remnant liver after major hepatectomy for colorectal liver metastasis.
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Affiliation(s)
- Sebastian Senger
- Institute for Clinical and Experimental Surgery, Homburg/Saar, Germany
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22
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Szél E, Polyánka H, Szabó K, Hartmann P, Degovics D, Balázs B, Németh IB, Korponyai C, Csányi E, Kaszaki J, Dikstein S, Nagy K, Kemény L, Erős G. Anti-irritant and anti-inflammatory effects of glycerol and xylitol in sodium lauryl sulphate-induced acute irritation. J Eur Acad Dermatol Venereol 2015; 29:2333-41. [PMID: 26370610 DOI: 10.1111/jdv.13225] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 05/21/2015] [Indexed: 11/27/2022]
Abstract
BACKGROUND Glycerol is known to possess anti-irritant and hydrating properties and previous studies suggested that xylitol may also have similar effects. OBJECTIVE Our aim was to study whether different concentrations of these polyols restore skin barrier function and soothe inflammation in sodium lauryl sulphate (SLS)-induced acute irritation. METHODS The experiments were performed on male SKH-1 hairless mice. The skin of the dorsal region was exposed to SLS (5%) for 3 h alone or together with 5% or 10% of glycerol respectively. Further two groups received xylitol solutions (8.26% and 16.52% respectively) using the same osmolarities, which were equivalent to those of the glycerol treatments. The control group was treated with purified water. Transepidermal water loss (TEWL) and skin hydration were determined. Microcirculatory parameters of inflammation were observed by means of intravital videomicroscopy (IVM). Furthermore, accumulation of neutrophil granulocytes and lymphocytes, the expression of inflammatory cytokines and SLS penetration were assessed, as well. RESULTS Treatment with the 10% of glycerol and both concentrations of xylitol inhibited the SLS-induced elevation of TEWL and moderated the irritant-induced increase in dermal blood flow and in the number of leucocyte-endothelial interactions. All concentrations of the applied polyols improved hydration and prevented the accumulation of lymphocytes near the treatment site. At the mRNA level, neither glycerol nor xylitol influenced the expression of interleukin-1 alpha. However, expression of interleukin-1 beta was significantly decreased by the 10% glycerol treatment, while expression of tumour necrosis factor-alpha decreased upon the same treatment, as well as in response to xylitol. Higher polyol treatments decreased the SLS penetration to the deeper layers of the stratum corneum. CONCLUSION Both of the analysed polyols exert considerable anti-irritant and anti-inflammatory properties, but the effective concentration of xylitol is lower than that of glycerol.
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Affiliation(s)
- E Szél
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
| | - H Polyánka
- Dermatological Research Group of the Hungarian Academy of Sciences, University of Szeged, Szeged, Hungary
| | - K Szabó
- Dermatological Research Group of the Hungarian Academy of Sciences, University of Szeged, Szeged, Hungary
| | - P Hartmann
- Institute of Surgical Research, University of Szeged, Szeged, Hungary
| | - D Degovics
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
| | - B Balázs
- Department of Pharmaceutical Technology, University of Szeged, Szeged, Hungary
| | - I B Németh
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
| | - C Korponyai
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
| | - E Csányi
- Department of Pharmaceutical Technology, University of Szeged, Szeged, Hungary
| | - J Kaszaki
- Institute of Surgical Research, University of Szeged, Szeged, Hungary
| | - S Dikstein
- Unit of Cell Pharmacology, Hebrew University, Jerusalem, Israel
| | - K Nagy
- Department of Oral Surgery, University of Szeged, Szeged, Hungary
| | - L Kemény
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary.,Dermatological Research Group of the Hungarian Academy of Sciences, University of Szeged, Szeged, Hungary
| | - G Erős
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary.,Department of Oral Biology and Experimental Dental Research, University of Szeged, Szeged, Hungary
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23
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Behrendt AK, Beythien M, Huber J, Zufraß T, Butschkau A, Mittlmeier T, Vollmar B. New TiAg composite coating for bone prosthesis engineering shows promising microvascular compatibility in the murine dorsal skinfold chamber model. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2015; 26:5373. [PMID: 25589204 DOI: 10.1007/s10856-014-5373-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 09/12/2014] [Indexed: 06/04/2023]
Abstract
The incorporation of antimicrobial substances like silver into implant surface coatings is one promising concept against primary infections of endoprosthesis, especially for immunocompromised patients as well as against reinfection after revision operations. However, besides good antimicrobial and mechanical properties it is equally important that the implant material does not disturb the local microvascular perfusion of muscle tissue to enable microbial host defense and tissue repair processes. In this study the biocompatibility of a newly developed TiAg-composite coating applied on conventional titanium via physical vapor deposition was analysed. To evaluate the local microvascular and inflammatory response of striated muscle tissue upon implantation of TiAg-coated plates the murine dorsal skinfold chamber model was used. We repetitively examined local capillary and venular perfusion, endothelial integrity as well as leucocyte activation by intravital fluorescence microscopy at 1 h, 24 h as well as 3 and 7 days after implantation. TiAg-implants were well tolerated by the vascular system as indicated by intact functional capillary density and endothelial integrity compared to pure titanium plates and controls without a metal implant. Furthermore, quantification of rolling and adherent leucocytes did not reveal signs of inflammation upon TiAg-implantation.
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Affiliation(s)
- Ann-Kathrin Behrendt
- Department of Trauma, Hand and Reconstructive Surgery, Rostock University Medical Center, Rostock, Germany,
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24
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Tar M, Cabrales P, Navati M, Adler B, Nacharaju P, Friedman AJ, Friedman J, Davies KP. Topically applied NO-releasing nanoparticles can increase intracorporal pressure and elicit spontaneous erections in a rat model of radical prostatectomy. J Sex Med 2014; 11:2903-14. [PMID: 25302850 DOI: 10.1111/jsm.12705] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
INTRODUCTION Patients undergoing radical prostatectomy (RP) suffer from erectile dysfunction (ED) refractory to phosphodiesterase 5 inhibitors, which act downstream of cavernous nerve (CN)-mediated release of nitric oxide (NO). Direct delivery of NO to the penis could potentially circumvent this limitation. AIM This study aimed to determine if topically applied NO-releasing nanoparticles (NO-NPs) could elicit erections in a rat model of RP through increased blood flow. METHODS Twenty-six Sprague Dawley rats underwent bilateral transection of the CN. One week later, NO-NPs were applied topically to the penile shaft in dimethylsulfoxide (DMSO) gel (10 animals) or coconut oil (6 animals). Control animals were treated with empty NPs. Erectile function was determined through the intracorporal pressure/blood pressure ratio (ICP/BP). The effect of the NO-NPs on blood flow was determined using a hamster dorsal window chamber. MAIN OUTCOME MEASURES Animals were investigated for spontaneous erections, onset and duration of erectile response, and basal ICP/BP ratio. Microcirculatory blood flow was determined through measurements of arteriolar and venular diameter and red blood cell velocity. RESULTS Eight of 10 animals treated with NO-NPs suspended in DMSO gel had significant increases in basal ICP/BP, and 6 out of these 10 animals demonstrated spontaneous erections of approximately 1 minute in duration. Time to onset of spontaneous erections ranged from 5 to 37 minutes, and they occurred for at least 45 minutes. Similar results were observed with NO-NPs applied in coconut oil. No erectile response was observed in control animal models treated with empty NPs. The hamster dorsal window chamber experiment demonstrated that NO-NPs applied as a suspension in coconut oil caused a significant increase in the microcirculatory blood flow, sustained over 90 minutes. CONCLUSIONS Topically applied NO-NPs induced spontaneous erections and increased basal ICP in an animal model of RP. These effects are most likely due to increased microcirculatory blood flow. These characteristics suggest that NO-NPs would be useful in penile rehabilitation of patients following RP.
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Affiliation(s)
- Moses Tar
- Department of Urology, Albert Einstein College of Medicine, New York, NY, USA
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Senger S, Kollmar O, Menger MD, Schilling MK, Rupertus K. Darbepoetin-α Accelerates Neovascularization and Engraftment of Extrahepatic Colorectal Metastases. Eur Surg Res 2014; 53:25-36. [DOI: 10.1159/000364944] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Accepted: 05/28/2014] [Indexed: 11/19/2022]
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Tschernig T, Veith NT, Schramm R, Laschke MW, Roller J, Rosenbruch M, Theegarten D, Bischoff M, Meier C, Menger MD. Direct visualisation of microparticles in the living lung. ACTA ACUST UNITED AC 2013; 65:883-6. [DOI: 10.1016/j.etp.2012.12.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Accepted: 12/14/2012] [Indexed: 01/29/2023]
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Wittig C, Laschke MW, Scheuer C, Menger MD. Incorporation of bone marrow cells in pancreatic pseudoislets improves posttransplant vascularization and endocrine function. PLoS One 2013; 8:e69975. [PMID: 23875013 PMCID: PMC3715469 DOI: 10.1371/journal.pone.0069975] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Accepted: 06/14/2013] [Indexed: 01/01/2023] Open
Abstract
Failure of revascularization is known to be the major reason for the poor outcome of pancreatic islet transplantation. In this study, we analyzed whether pseudoislets composed of islet cells and bone marrow cells can improve vascularization and function of islet transplants. Pancreatic islets isolated from Syrian golden hamsters were dispersed into single cells for the generation of pseudoislets containing 4×103 cells. To create bone marrow cell-enriched pseudoislets 2×103 islet cells were co-cultured with 2×103 bone marrow cells. Pseudoislets and bone marrow cell-enriched pseudoislets were transplanted syngeneically into skinfold chambers to study graft vascularization by intravital fluorescence microscopy. Native islet transplants served as controls. Bone marrow cell-enriched pseudoislets showed a significantly improved vascularization compared to native islets and pseudoislets. Moreover, bone marrow cell-enriched pseudoislets but not pseudoislets normalized blood glucose levels after transplantation of 1000 islet equivalents under the kidney capsule of streptozotocin-induced diabetic animals, although the bone marrow cell-enriched pseudoislets contained only 50% of islet cells compared to pseudoislets and native islets. Fluorescence microscopy of bone marrow cell-enriched pseudoislets composed of bone marrow cells from GFP-expressing mice showed a distinct fraction of cells expressing both GFP and insulin, indicating a differentiation of bone marrow-derived cells to an insulin-producing cell-type. Thus, enrichment of pseudoislets by bone marrow cells enhances vascularization after transplantation and increases the amount of insulin-producing tissue. Accordingly, bone marrow cell-enriched pseudoislets may represent a novel approach to increase the success rate of islet transplantation.
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Affiliation(s)
- Christine Wittig
- Institute for Clinical & Experimental Surgery, University of Saarland, Homburg/Saar, Germany.
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Kuehl AR, Abshagen K, Eipel C, Laschke MW, Menger MD, Laue M, Vollmar B. External inosculation as a feature of revascularization occurs after free transplantation of murine liver grafts. Am J Transplant 2013; 13:286-98. [PMID: 23205733 DOI: 10.1111/j.1600-6143.2012.04336.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Revised: 10/02/2012] [Accepted: 10/09/2012] [Indexed: 01/25/2023]
Abstract
The induction of angiogenesis is essential for successful engraftment of freely transplanted cells or cellular composites. How to augment angiogenesis to ensure an appropriate viability of the grafts is still under investigation. This study evaluated the proangiogenic capability of different syngeneic free liver transplants and elucidated the origin of the newly formed vascular network via use of an eGFP(+) /eGFP(-) (enhanced green fluorescent protein) cross-over design. Using intravital fluorescence microscopy, we found that neonatal and resected murine liver transplants implanted into dorsal skinfold chambers display a significantly enhanced vascularization compared to regular adult transplants. Immunohistochemically, less tissue hypoxia, apoptosis and macrophage infiltration was observed in the neonatal and resected transplants, which is in line with improved vascularization of those grafts. Additionally, electron microscopy revealed morphological hallmarks of liver cells. eGFP(+) liver transplants implanted on eGFP(-) recipients displayed vascular sprouting from the grafts themselves and connection to the recipients` microvasculature, which also undergoes transient proangiogenic response. This process is described as external inosculation, with microvessels exhibiting a chimeric nature of the endothelial lining. These data collectively show that proliferative stimulation is taking effect on angiogenic properties of free transplants and might provide a novel tool for modulating the revascularization of free grafts.
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Affiliation(s)
- A-R Kuehl
- Institute for Experimental Surgery, University of Rostock, Rostock, Germany
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Abstract
Experimental animals in biomedical research provide insights into disease mechanisms and models for determining the efficacy and safety of new therapies and for discovery of corresponding biomarkers. Although mouse and rat models are most widely used, observations in these species cannot always be faithfully extrapolated to human patients. Thus, a number of domestic species are additionally used in specific disease areas. This review summarizes the most important applications of domestic animal models and emphasizes the new possibilities genetic tailoring of disease models, specifically in pigs, provides.
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Affiliation(s)
- A Bähr
- Chair for Molecular Animal Breeding and Biotechnology, Department of Veterinary Sciences, Ludwig-Maximilians-Universität München, Munich, Germany
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James ML, Gambhir SS. A molecular imaging primer: modalities, imaging agents, and applications. Physiol Rev 2012; 92:897-965. [PMID: 22535898 DOI: 10.1152/physrev.00049.2010] [Citation(s) in RCA: 702] [Impact Index Per Article: 58.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Molecular imaging is revolutionizing the way we study the inner workings of the human body, diagnose diseases, approach drug design, and assess therapies. The field as a whole is making possible the visualization of complex biochemical processes involved in normal physiology and disease states, in real time, in living cells, tissues, and intact subjects. In this review, we focus specifically on molecular imaging of intact living subjects. We provide a basic primer for those who are new to molecular imaging, and a resource for those involved in the field. We begin by describing classical molecular imaging techniques together with their key strengths and limitations, after which we introduce some of the latest emerging imaging modalities. We provide an overview of the main classes of molecular imaging agents (i.e., small molecules, peptides, aptamers, engineered proteins, and nanoparticles) and cite examples of how molecular imaging is being applied in oncology, neuroscience, cardiology, gene therapy, cell tracking, and theranostics (therapy combined with diagnostics). A step-by-step guide to answering biological and/or clinical questions using the tools of molecular imaging is also provided. We conclude by discussing the grand challenges of the field, its future directions, and enormous potential for further impacting how we approach research and medicine.
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Affiliation(s)
- Michelle L James
- Molecular Imaging Program, Department of Radiology, Stanford University, Palo Alto, CA 94305, USA
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Ehrmantraut S, Naumann A, Willnecker V, Akinyemi S, Körbel C, Scheuer C, Meyer-Lindenberg A, Menger MD, Laschke MW. Vitalization of porous polyethylene (Medpor®) with chondrocytes promotes early implant vascularization and incorporation into the host tissue. Tissue Eng Part A 2012; 18:1562-72. [PMID: 22452340 DOI: 10.1089/ten.tea.2011.0340] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Porous polyethylene (Medpor(®)) is frequently used in craniofacial reconstructive surgery. The successful incorporation of this alloplastic biomaterial depends on adequate vascularization. Here, we analyzed whether the early vascularization of porous polyethylene can be accelerated by vitalization with human chondrocytes. For this purpose, small polyethylene samples were coated with platelet-rich plasma (PRP) or a suspension of PRP and human chondrocytes. Uncoated polyethylene samples served as controls. Subsequently, the samples were implanted into the dorsal skinfold chamber of CD-1 nude mice to repetitively analyze their vascularization and biocompatibility by means of intravital fluorescence microscopy. PRP-chondrocyte-coated polyethylene exhibited an accelerated and improved vascularization when compared with the other two groups. This was indicated by a significantly higher functional capillary density of the microvascular network developing around the implants. Moreover, a leukocyte-endothelial cell interaction was found in a physiological range at the implantation site of all three groups, demonstrating that the vitalization with PRP and chondrocytes did not affect the good biocompatibility of the alloplastic material. Additional histological, immunohistochemical, and in situ hybridization analyses revealed that the chondrocytes formed a bioprotective tissue layer, which prevented the accumulation of macrophages and foreign body giant cells on the polyethylene surface. These findings clearly indicate that vitalization of polyethylene with chondrocytes promotes early implant vascularization and incorporation into the host tissue and, thus, may be a promising approach that prevents postoperative complications such as implant extrusion, migration, and infection.
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Affiliation(s)
- Susanne Ehrmantraut
- Institute for Clinical and Experimental Surgery, University of Saarland, Homburg/Saar, Germany
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Goertz O, Lauer H, Hirsch T, Ring A, Lehnhardt M, Langer S, Steinau HU, Hauser J. Extracorporeal shock waves improve angiogenesis after full thickness burn. Burns 2012; 38:1010-8. [PMID: 22445836 DOI: 10.1016/j.burns.2012.02.018] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2012] [Accepted: 02/09/2012] [Indexed: 12/11/2022]
Abstract
OBJECTIVE Extensive wounds of burn patients remain a challenge due to wound infection and subsequent septicemia. We wondered whether extracorporeal shock wave application (ESWA) accelerates the healing process. The aim of the study was to analyze microcirculation, angiogenesis and leukocyte endothelium interaction after burns by using ESWA with two types of low intensity. METHODS Full-thickness burns were inflicted to the ears of hairless mice (n=51; area: 1.3 mm(2)). The mice were randomized into five groups: (A) low-energy shock waves after burn injury (0.04 mJ/mm(2)); (B) very low-energy shock waves after burn injury (0.015 mJ/mm(2)); (C) mice received burns but no ESWA (control group); (D) mice without burn were exposed to low-energy shock waves; (E) mice without burns and with no shock wave application. Intravital fluorescent microscopy was used to assess microcirculatory parameters, angiogenesis and leukocyte behavior. ESWA was performed on day 1, 3 and 7 (500 shoots, 1 Hz). Values were obtained straight after and on days 1, 3, 7 and 12 post burn. RESULTS Group A showed accelerated angiogenesis (non-perfused area at day 12: 5.3% vs. 9.1% (group B) and 12.6% (group C), p=0.005). Both shock wave groups showed improved blood flow after burn compared to group C. Shock waves significantly increased the number of rolling leukocytes compared to the non-ESWA-treated animals (group D: 210.8% vs. group E: 83.3%, p=0.017 on day 7 and 172.3 vs. 90.9%, p=0.01 on day 12). CONCLUSION Shock waves have a positive effect on several parameters of wound healing after burns, especially with regard to angiogenesis and leukocyte behaviour. In both ESWA groups, angiogenesis and blood flow outmatched the control group. Within the ESWA groups the higher intensity (0.04 mJ/mm(2)) showed better results than the lower intensity group. Moreover, shock waves increased the number of rolling and sticking leukocytes as a part of an improved metabolism.
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Affiliation(s)
- O Goertz
- Department of Plastic and Hand Surgery, Burn Center, BG-University Hospital Bergmannsheil, Ruhr-University Bochum, Buerkle-de-la-Camp Platz 1, 44789 Bochum, Germany.
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Feng D, Welker S, Körbel C, Rudzitis-Auth J, Menger MD, Montenarh M, Laschke MW. Protein kinase CK2 is a regulator of angiogenesis in endometriotic lesions. Angiogenesis 2012; 15:243-52. [DOI: 10.1007/s10456-012-9256-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Accepted: 02/09/2012] [Indexed: 12/23/2022]
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Jia W, Tran N, Sun V, Marinček M, Majaron B, Choi B, Nelson JS. Photocoagulation of dermal blood vessels with multiple laser pulses in an in vivo microvascular model. Lasers Surg Med 2012; 44:144-51. [PMID: 22275290 DOI: 10.1002/lsm.22000] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/19/2011] [Indexed: 11/11/2022]
Abstract
BACKGROUND/OBJECTIVES Current laser therapy of port wine stain (PWS) birthmarks with a single laser pulse (SLP) does not produce complete lesion removal in the majority of patients. To improve PWS therapeutic efficacy, we evaluated the performance of an approach based on multiple laser pulses (MLP) to enhance blood vessel photocoagulation. STUDY DESIGN The hamster dorsal window chamber model was used. Radiant exposure (RE), pulse repetition rate (f(r)), total number of pulses (n(p)), and length of vessel irradiated were varied. Blood vessels in the window were irradiated with either SLP with RE of 4-7 J/cm(2) or MLP with RE per pulse of 1.4-5.0 J/cm(2), f(r) of 0.5-26.0 Hz, and n(p) of 2-5. The laser wavelength was 532 nm and pulse duration was 1 ms. Either a 2 mm vessel segment or entire vessel branch was irradiated. Digital photographs and laser speckle images of the window were recorded before and at specific time points after laser irradiation to monitor laser-induced blood vessel structural and functional changes, respectively. RESULTS We found that: (1) for a SLP approach, the RE required to induce blood vessel photocoagulation was 7 J/cm(2) as compared to only 2 J/cm(2) per pulse for the MLP approach; (2) for MLP, two pulses at a repetition rate of 5 Hz and a RE of 3 J/cm(2) can induce photocoagulation of more than 80% of irradiated blood vessel; and (3) irradiation of a longer segment of blood vessel resulted in lower reperfusion rate. CONCLUSIONS The MLP approach can induce blood vessel photocoagulation at much lower RE per pulse as compared to SLP. The 5 Hz f(r) and the need for two pulses are achievable with modern laser technology, which makes the MLP approach practical in the clinical management of PWS birthmarks.
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Affiliation(s)
- Wangcun Jia
- Beckman Laser Institute and Medical Clinic, Department of Surgery, University of California, Irvine, California 92617-3010, USA.
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Eros G, Hartmann P, Berkó S, Csizmazia E, Csányi E, Sztojkov-Ivanov A, Németh I, Szabó-Révész P, Zupkó I, Kemény L. A novel murine model for the in vivo study of transdermal drug penetration. ScientificWorldJournal 2012; 2012:543536. [PMID: 22272176 PMCID: PMC3259504 DOI: 10.1100/2012/543536] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Accepted: 11/02/2011] [Indexed: 11/17/2022] Open
Abstract
Enhancement of the transdermal penetration of different active agents is an important research goal. Our aim was to establish a novel in vivo experimental model which provides a possibility for exact measurement of the quantity of penetrated drug. The experiments were performed on SKH-1 hairless mice. A skin fold in the dorsal region was fixed with two fenestrated titanium plates. A circular wound was made on one side of the skin fold. A metal cylinder with phosphate buffer was fixed into the window of the titanium plate. The concentration of penetrated drug was measured in the buffer. The skin fold was morphologically intact and had a healthy microcirculation. The drug appeared in the acceptor buffer after 30 min, and its concentration exhibited a continuous increase. The presence of ibuprofen was also detected in the plasma. In conclusion, this model allows an exact in vivo study of drug penetration and absorption.
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Affiliation(s)
- Gábor Eros
- Department of Dermatology and Allergology, University of Szeged, 6720 Szeged, Hungary.
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Valentine H, Daugherity EK, Singh B, Maurer KJ. The Experimental Use of Syrian Hamsters. THE LABORATORY RABBIT, GUINEA PIG, HAMSTER, AND OTHER RODENTS 2012. [PMCID: PMC7149563 DOI: 10.1016/b978-0-12-380920-9.00034-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 03/24/2023]
Abstract
The Syrian hamster (Mesocricetus auratus) is a widely used experimental animal model. This chapter focuses primarily on the most current research uses of the hamster. More classical uses are covered only as they pertain to these current uses. Hamsters possess unique anatomical and physiological features, which make them desirable research models. Unlike other commonly used laboratory rodents, hamsters possess a cheek pouch, which can be easily everted and examined at both the gross and microscopic level. The hamster's relative size also allows for better visualization of certain biological systems including the respiratory and reproductive systems when compared to the mouse. Further, laboratory hamsters develop a variety of inherited diseases, which display similarities to human conditions. Hamsters possessing some of these inherited traits are commercially available. They are susceptible to a variety of carcinogens and develop tumors that other research animals less commonly develop. Also they are susceptible to the induction of a variety of metabolic disorders through the use of dietary manipulations. The antagonistic nature of hamsters is used to study the effect of treatment on male aggressive and defensive behaviors. Syrian hamsters display several unique characteristics that make them desired models for carcinogenesis studies.
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Bone Marrow Suppression by c-Kit Blockade Enhances Tumor Growth of Colorectal Metastases through the Action of Stromal Cell-Derived Factor-1. JOURNAL OF ONCOLOGY 2011; 2012:196957. [PMID: 21977032 PMCID: PMC3184505 DOI: 10.1155/2012/196957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Revised: 08/02/2011] [Accepted: 08/07/2011] [Indexed: 11/17/2022]
Abstract
Background. Mobilization of c-Kit+ hematopoietic cells (HCs) contributes to tumor vascularization. Whereas survival and proliferation of HCs are regulated by binding of the stem cell factor to its receptor c-Kit, migration of HCs is directed by stromal cell-derived factor (SDF)-1. Therefore, targeting migration of HCs provides a promising new strategy of anti-tumor therapy. Methods. BALB/c mice (n = 16) were pretreated with an anti-c-Kit antibody followed by implantation of CT26.WT-GFP colorectal cancer cells into dorsal skinfold chambers. Animals (n = 8) additionally received a neutralizing anti-SDF-1 antibody. Animals (n = 8) treated with a control antibody served as controls. Investigations were performed using intravital fluorescence microscopy, immunohistochemistry, flow cytometry and western blot analysis. Results. Blockade of c-Kit significantly enhanced tumor cell engraftment compared to controls due to stimulation of tumor cell proliferation and invasion without markedly affecting tumor vascularization. C-Kit blockade significantly increased VEGF and CXCR4 expression within the growing tumors. Neutralization of SDF-1 completely antagonized this anti-c-Kit-associated tumor growth by suppression of tumor neovascularization, inhibition of tumor cell proliferation and reduction of muscular infiltration. Conclusion. Our study indicates that bone marrow suppression via anti-c-Kit pretreatment enhances tumor cell engraftment of colorectal metastases due to interaction with the SDF-1/CXCR4 pathway which is involved in HC-mediated tumor angiogenesis.
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Ring A, Tilkorn DJ, Goertz O, Langer S, Schaffran A, Awakowicz P, Hauser J. Surface modification by glow discharge gasplasma treatment improves vascularization of allogenic bone implants. J Orthop Res 2011; 29:1237-44. [PMID: 21381095 DOI: 10.1002/jor.21358] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2010] [Accepted: 12/13/2010] [Indexed: 02/04/2023]
Abstract
Sufficient induction of blood vessel ingrowth decisively influence transplant functionality. In this study, microvascular response to transplants of surface modified bone substitutes were assessed in vivo. The surface modification of allogenic bone substitutes (dehydrated human femoral head) was achieved in a double-conductive low-pressure gasplasma reactor (Ar(2) /O(2) , 13.65 MHz, 1,000 W, 5 Pa). The modified bone substitutes (n = 10) as well as untreated bone substitutes serving as controls (n = 10) were placed into the dorsal skinfold chamber of female balb/c mice (n = 10). Dynamic assessment of microcirculatory parameters was performed using intravital fluorescence microscopy during an implantation period of 10 days. The angiogenic response was found markedly accelerated in gasplasma-treated bone. Compared to untreated implants, the gasplasma-activated bone substitutes showed significantly higher microvascular density on days 5 and 10. The quantification of the microvascular diameters, red blood cell velocity, and microvascular permeability displayed stable perfusion and vascular integrity of the newly developed blood vessels throughout the 10-day observation period. The surface activation via cold low-pressure glow discharge gasplasma supports the vascular integration of allogenic bone by earlier induction of the angiogenesis.
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Affiliation(s)
- Andrej Ring
- Department of Plastic Surgery, BG University Hospital Bergmannsheil, Ruhr University Bochum, Bürkle-de-la-Camp Platz 1, 44789 Bochum, Germany.
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Laschke MW, Vorsterman van Oijen AE, Scheuer C, Menger MD. In vitro and in vivo evaluation of the anti-angiogenic actions of 4-hydroxybenzyl alcohol. Br J Pharmacol 2011; 163:835-44. [PMID: 21366552 PMCID: PMC3111685 DOI: 10.1111/j.1476-5381.2011.01292.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2010] [Revised: 12/21/2010] [Accepted: 01/15/2011] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND AND PURPOSE 4-Hydroxybenzyl alcohol (HBA) is a phenolic plant compound, which has been shown to influence many cellular mechanisms. In the present study, we analysed in vitro and in vivo the anti-angiogenic actions of this pleiotropic agent. EXPERIMENTAL APPROACH Migration and protein expression of HBA- and vehicle-treated endothelial-like eEND2 cells was assessed by cell migration assay and Western blot analyses. HBA action on vascular sprouting was analysed in an aortic ring assay. In vivo anti-angiogenic actions of HBA were studied in the dorsal skinfold chamber model of endometriosis in mice. KEY RESULTS Western blot analyses demonstrated that HBA inhibited proliferation of eEND2 cells, as indicated by down-regulation of proliferating cell nuclear antigen expression, and reduced expression of vascular endothelial growth factor and matrix metalloproteinase 9. HBA suppressed the migration of eEND2 cells, accompanied by inhibition of actin filament reorganization, revealed by fluorescence staining of the cytoskeleton. In addition, HBA reduced vascular sprouting in the aortic ring assay. Finally, we found, in the dorsal skinfold chamber model in vivo using intravital fluorescence microscopy, that HBA inhibited the vascularization of developing endometriotic lesions, as indicated by a decreased functional capillary density of lesions in HBA-treated mice and a reduced lesion size, compared with control animals. CONCLUSIONS AND IMPLICATIONS HBA targets several angiogenic mechanisms and therefore represents a promising anti-angiogenic agent for the treatment of angiogenic diseases, such as endometriosis.
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Affiliation(s)
- M W Laschke
- Institute for Clinical & Experimental Surgery, University of Saarland, Homburg/Saar, Germany.
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Blockade of gC1qR/p33, a receptor for C1q, inhibits adherence of Staphylococcus aureus to the microvascular endothelium. Microvasc Res 2011; 82:66-72. [PMID: 21539847 DOI: 10.1016/j.mvr.2011.04.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Revised: 04/08/2011] [Accepted: 04/18/2011] [Indexed: 11/23/2022]
Abstract
Endovascular infections with Staphylococcus aureus (S. aureus) are associated with high mortality. gC1qR/p33 (gC1qR), a receptor for the complement component C1q expressed on endothelial cells, interacts with protein A of S. aureus and gC1qR blockade reduces S. aureus colonization during infective endocarditis. The aim of this study was to analyze in vivo whether this observation is due to a decreased interaction of S. aureus with the microvascular endothelium. A dorsal skinfold chamber was prepared in Syrian golden hamsters, which were treated with the monoclonal antibody (MAb) 74.5.2 directed against gC1qR or vehicle. The interaction of fluorescein isothiocyanate (FITC)-labeled staphylococci and leukocytes with the endothelium was analyzed under physiological conditions as well as after TNF-α-induced inflammation using intravital fluorescence microscopy. Administration of MAb 74.5.2 significantly reduced adherence of S. aureus to the endothelium in untreated and TNF-α-exposed tissue. In addition, we could demonstrate in vitro that S. aureus adherence to human endothelial cells was inhibited by MAb 74.5.2. Blockade of gC1qR did not affect leukocyte-endothelial cell interaction. In conclusion, our findings indicate that immunological inhibition of gC1qR may be therapeutically used to decrease the interaction of S. aureus with the microvascular endothelium.
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Laschke MW, Mussawy H, Schuler S, Kazakov A, Rücker M, Eglin D, Alini M, Menger MD. Short-Term Cultivation of In Situ Prevascularized Tissue Constructs Accelerates Inosculation of Their Preformed Microvascular Networks After Implantation into the Host Tissue. Tissue Eng Part A 2011; 17:841-53. [DOI: 10.1089/ten.tea.2010.0329] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Matthias W. Laschke
- Institute for Clinical and Experimental Surgery, University of Saarland, Homburg/Saar, Germany
- Collaborative Research Center AO Foundation, University of Saarland, Homburg/Saar, Germany
| | - Haider Mussawy
- Institute for Clinical and Experimental Surgery, University of Saarland, Homburg/Saar, Germany
- Collaborative Research Center AO Foundation, University of Saarland, Homburg/Saar, Germany
| | - Sandra Schuler
- Institute for Clinical and Experimental Surgery, University of Saarland, Homburg/Saar, Germany
- Collaborative Research Center AO Foundation, University of Saarland, Homburg/Saar, Germany
| | - Andrey Kazakov
- Internal Medicine III—Cardiology, Angiology and Intensive Care Medicine, Saarland University Hospital, Homburg/Saar, Germany
| | - Martin Rücker
- Department of Oral and Maxillofacial Surgery, Hannover Medical School, Hannover, Germany
| | - David Eglin
- AO Research Institute, Clavadelerstrasse, Davos Platz, Switzerland
| | - Mauro Alini
- AO Research Institute, Clavadelerstrasse, Davos Platz, Switzerland
| | - Michael D. Menger
- Institute for Clinical and Experimental Surgery, University of Saarland, Homburg/Saar, Germany
- Collaborative Research Center AO Foundation, University of Saarland, Homburg/Saar, Germany
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McDaniel JR, Callahan DJ, Chilkoti A. Drug delivery to solid tumors by elastin-like polypeptides. Adv Drug Deliv Rev 2010; 62:1456-67. [PMID: 20546809 PMCID: PMC2940962 DOI: 10.1016/j.addr.2010.05.004] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2010] [Revised: 05/11/2010] [Accepted: 05/13/2010] [Indexed: 01/08/2023]
Abstract
Thermally responsive elastin-like polypeptides (ELPs) are a promising class of recombinant biopolymers for the delivery of drugs and imaging agents to solid tumors via systemic or local administration. This article reviews four applications of ELPs to drug delivery, with each delivery mechanism designed to best exploit the relationship between the characteristic transition temperature (T(t)) of the ELP and body temperature (T(b)). First, when T(t)≫T(b), small hydrophobic drugs can be conjugated to the C-terminus of the ELP to impart the amphiphilicity needed to mediate the self-assembly of nanoparticles. These systemically delivered ELP-drug nanoparticles preferentially localize to the tumor site via the EPR effect, resulting in reduced toxicity and enhanced treatment efficacy. The remaining three approaches take direct advantage of the thermal responsiveness of ELPs. In the second strategy, where T(b)
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Affiliation(s)
- Jonathan R. McDaniel
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, 27708-0181, USA
| | - Daniel J. Callahan
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, 27708-0181, USA
| | - Ashutosh Chilkoti
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, 27708-0181, USA
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Katayama H, Katayama T, Uematsu K, Hiratsuka M, Kiyomura M, Shimizu Y, Sugita A, Ito M. Effect of dienogest administration on angiogenesis and hemodynamics in a rat endometrial autograft model. Hum Reprod 2010; 25:2851-8. [PMID: 20813806 DOI: 10.1093/humrep/deq241] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND We aimed to establish an endometrial autograft model in rats that would allow for repetitive in vivo analyses of angiogenesis. Dienogest (DNG) is an orally active progestin used for the treatment of endometriosis. We investigated whether DNG would affect angiogenesis of the ectopic endometrium in our model. METHODS Mechanically isolated endometrial fragments were transplanted into dorsal skinfold chambers in rats. We analyzed the effect of DNG on angiogenesis of the ectopic endometrium on Days 0, 2, 4, 7, 10 and 14 after transplantation using intravital fluorescence microscopy. RESULTS The DNG-administered group showed significant suppression of angiogenesis of endometrial autografts, as indicated by the reduced size of the microvascular network and decreased microvessel density compared with those of control animals. The newly formed microvessels of the DNG-administered group showed consistently elevated diameters and centerline red blood cell velocity was decreased. Immunohistochemistry revealed a significant reduction in the level of perivascular α-smooth muscle actin within endometrial grafts of the DNG-administered group. CONCLUSIONS DNG inhibited angiogenesis of the ectopic endometrium, with confirmed structural changes in the microvessels.
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Affiliation(s)
- Hiroko Katayama
- Department of Obstetrics & Gynecology, Graduate School of Medicine, Ehime University, Shitsukawa Toon, Ehime, Japan
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Koschwanez H, Reichert W, Klitzman B. Intravital microscopy evaluation of angiogenesis and its effects on glucose sensor performance. J Biomed Mater Res A 2010; 93:1348-57. [PMID: 19911378 PMCID: PMC2916729 DOI: 10.1002/jbm.a.32630] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
An optical window model for the rodent dorsum was used to perform chronic and quantitative intravital microscopy and laser Doppler flowmetry of microvascular networks adjacent to functional and non-functional glucose sensors. The one-sided configuration afforded direct, real-time observation of the tissue response to bare (unmodified, smooth surface) sensors and sensors coated with porous poly-L-lactic acid (PLLA). Microvessel length density and red blood cell flux (blood perfusion) within 1 mm of the sensors were measured bi-weekly over 2 weeks. When non-functional sensors were fully implanted beneath the windows, the porous coated sensors had two-fold more vasculature and significantly higher blood perfusion than bare sensors on Day 14. When functional sensors were implanted percutaneously, as in clinical use, no differences in baseline current, neovascularization, or tissue perfusion were observed between bare and porous coated sensors. However, percutaneously implanted bare sensors had two-fold more vascularity than fully implanted bare sensors by Day 14, indicating the other factors, such as micromotion, might be stimulating angiogenesis. Despite increased angiogenesis adjacent to percutaneous sensors, modest sensor current attenuation occurred over 14 days, suggesting that factors other than angiogenesis may play a dominant role in determining sensor function.
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Affiliation(s)
- H.E. Koschwanez
- Department of Biomedical Engineering, Duke University, Durham, NC 27708
| | - W.M. Reichert
- Department of Biomedical Engineering, Duke University, Durham, NC 27708
| | - B. Klitzman
- Department of Biomedical Engineering, Duke University, Durham, NC 27708
- Kenan Plastic Surgery Research Labs, Duke University Medical Center, Durham, NC 27710
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Laschke MW, Strohe A, Menger MD, Alini M, Eglin D. In vitro and in vivo evaluation of a novel nanosize hydroxyapatite particles/poly(ester-urethane) composite scaffold for bone tissue engineering. Acta Biomater 2010; 6:2020-7. [PMID: 20004748 DOI: 10.1016/j.actbio.2009.12.004] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2009] [Revised: 10/19/2009] [Accepted: 12/01/2009] [Indexed: 01/21/2023]
Abstract
Scaffolds for bone tissue engineering should provide an osteoconductive surface to promote the ingrowth of new bone after implantation into bone defects. This may be achieved by hydroxyapatite loading of distinct scaffold biomaterials. Herein, we analyzed the in vitro and in vivo properties of a novel nanosize hydroxyapatite particles/poly(ester-urethane) (nHA/PU) composite scaffold which was prepared by a salt leaching-phase inverse process. Microtomography, scanning electron microscopy and X-ray spectroscopy analyses demonstrated the capability of the material processing to create a three-dimensional porous PU scaffold with nHA on the surface. Compared to nHA-free PU scaffolds (control), this modified scaffold type induced a significant increase in in vitro adsorption of model proteins. In vivo analysis of the inflammatory and angiogenic host tissue response to implanted nHA/PU scaffolds in the dorsal skinfold chamber model indicated that the incorporation of nHA particles into the scaffold material did not affect biocompatibility and vascularization when compared to control scaffolds. Thus, nHA/PU composite scaffolds represent a promising new type of scaffold for bone tissue engineering, combining the flexible material properties of PU with the advantage of an osteoconductive surface.
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Affiliation(s)
- M W Laschke
- Institute for Clinical & Experimental Surgery, University of Saarland, 66421 Homburg/Saar, Germany.
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Sapuppo F, Llobera A, Schembri F, Intaglietta M, Cadarso VJ, Bucolo M. A polymeric micro-optical interface for flow monitoring in biomicrofluidics. BIOMICROFLUIDICS 2010; 4:024108. [PMID: 20697581 PMCID: PMC2917872 DOI: 10.1063/1.3435333] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2010] [Accepted: 05/03/2010] [Indexed: 05/29/2023]
Abstract
We describe design and miniaturization of a polymeric optical interface for flow monitoring in biomicrofluidics applications based on polydimethylsiloxane technology, providing optical transparency and compatibility with biological tissues. Design and ray tracing simulation are presented as well as device realization and optical analysis of flow dynamics in microscopic blood vessels. Optics characterization of this polymeric microinterface in dynamic experimental conditions provides a proof of concept for the application of the device to two-phase flow monitoring in both in vitro experiments and in vivo microcirculation investigations. This technology supports the study of in vitro and in vivo microfluidic systems. It yields simultaneous optical measurements, allowing for continuous monitoring of flow. This development, integrating a well-known and widely used optical flow monitoring systems, provides a disposable interface between live mammalian tissues and microfluidic devices making them accessible to detectionprocessing technology, in support or replacing standard intravital microscopy.
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Jia W, Sun V, Tran N, Choi B, Liu SW, Mihm MC, Phung TL, Nelson JS. Long-term blood vessel removal with combined laser and topical rapamycin antiangiogenic therapy: implications for effective port wine stain treatment. Lasers Surg Med 2010; 42:105-12. [PMID: 20166161 DOI: 10.1002/lsm.20890] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND AND OBJECTIVES Complete blanching of port wine stain (PWS) birthmarks after laser therapy is rarely achieved for most patients. We postulate that the low therapeutic efficacy or treatment failure is caused by regeneration and revascularization of photocoagulated blood vessels due to angiogenesis associated with the skin's normal wound healing response. Rapamycin (RPM), an antiangiogenic agent, has been demonstrated to inhibit growth of pathological blood vessels. Our objectives were to (1) investigate whether topical RPM can inhibit reperfusion of photocoagulated blood vessels in an animal model and (2) determine the effective RPM concentration required to achieve this objective. STUDY DESIGN/MATERIALS AND METHODS For both laser-only and combined laser and RPM treated animals, blood vessels in the dorsal window chambers implanted on golden Syrian hamsters were photocoagulated with laser pulses. Structural and flow dynamics of blood vessels were documented with color digital photography and laser speckle imaging to evaluate photocoagulation and reperfusion. For the combined treatment group, topical RPM was applied to the epidermal side of the window daily for 14 days after laser exposure. RESULTS In the laser-only group, 23 out of 24 photocoagulated blood vessels reperfused within 5-14 days. In the combined treatment group with different RPM formulae and concentrations, the overall reperfusion rate of 36% was much lower as compared to the laser-only group. We also found that the reperfusion rate was not linearly proportional to the RPM concentration. CONCLUSIONS With topical RPM application, the frequency of vessel reperfusion was considerably reduced, which implies that combined light and topical antiangiogenic therapy might be a promising approach to improve the treatment efficacy of PWS birthmarks.
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Affiliation(s)
- Wangcun Jia
- Beckman Laser Institute, University of California, Irvine, California 92617-3010, USA.
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Laschke MW, Schwender C, Vollmar B, Menger MD. Genistein Does Not Affect Vascularization and Blood Perfusion of Endometriotic Lesions and Ovarian Follicles in Dorsal Skinfold Chambers of Syrian Golden Hamsters. Reprod Sci 2010; 17:568-77. [DOI: 10.1177/1933719110364417] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Matthias W. Laschke
- Institute for Clinical & Experimental Surgery, University of Saarland, Homburg/Saar, Germany,
| | - Christine Schwender
- Institute for Clinical & Experimental Surgery, University of Saarland, Homburg/Saar, Germany
| | - Brigitte Vollmar
- Institute for Experimental Surgery, University of Rostock, Rostock, Germany
| | - Michael D. Menger
- Institute for Clinical & Experimental Surgery, University of Saarland, Homburg/Saar, Germany
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49
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Microvascular response to calcium phosphate bone substitutes: an intravital microscopy analysis. Langenbecks Arch Surg 2010; 395:1147-55. [DOI: 10.1007/s00423-010-0608-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2009] [Accepted: 02/04/2010] [Indexed: 10/19/2022]
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50
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Debergh I, Van Damme N, Pattyn P, Peeters M, Ceelen WP. The low-molecular-weight heparin, nadroparin, inhibits tumour angiogenesis in a rodent dorsal skinfold chamber model. Br J Cancer 2010; 102:837-43. [PMID: 20125158 PMCID: PMC2833243 DOI: 10.1038/sj.bjc.6605535] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Revised: 12/10/2009] [Accepted: 12/16/2009] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Recently, low-molecular-weight heparins (LMWHs) were found to confer a survival advantage in cancer patients. The mechanism underlying this observation is unclear, but may involve inhibition of tumour angiogenesis. We aimed to examine the effects of nadroparin on tumour angiogenesis using a dorsal skinfold window chamber model in the Syrian hamster. METHODS AMel-3 and HAP-T1 tumours were grown in donor animals and fragments implanted in the window chambers. Animals (N=46) were treated with 200 IU of nadroparin or saline for 10 days. Repeated intravital fluorescence microscopy was performed to calculate functional microcirculatory parameters: number (N) and length (L) of microvessels, vascular area fraction (AF), and red blood cell velocity (V). Microvessel density (MVD), fractal dimension, and pericyte coverage were assessed histologically. RESULTS Active angiogenesis was observed in control animals, resulting in a significant increase in N, L, and AF. In nadroparin-treated animals, however, N and L did not increase whereas AF decreased significantly. Both groups showed an initial increase in V, but nadroparin treatment resulted in an earlier decrease in red blood cell velocity over time. Compared with control animals, nadroparin-treated animals showed a significantly lower MVD and fractal dimension but significantly higher pericyte coverage index (PCI). CONCLUSIONS Taken together, these results suggest that the LMWH nadroparin inhibits tumour angiogenesis and results in microvessel normalisation.
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Affiliation(s)
- I Debergh
- Department of Surgery, University Hospital, Ghent B-9000, Belgium
| | - N Van Damme
- Department of Gastroenterology, University Hospital, Ghent B-9000, Belgium
| | - P Pattyn
- Department of Surgery, University Hospital, Ghent B-9000, Belgium
| | - M Peeters
- Department of Gastroenterology, University Hospital, Ghent B-9000, Belgium
| | - W P Ceelen
- Department of Surgery, University Hospital, Ghent B-9000, Belgium
- Senior Clinical Investigator of the Research Foundation – Flanders (Belgium) (FWO)
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