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Physical Stimulation Combined with Biomaterials Promotes Peripheral Nerve Injury Repair. Bioengineering (Basel) 2022; 9:bioengineering9070292. [PMID: 35877343 PMCID: PMC9311987 DOI: 10.3390/bioengineering9070292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 06/11/2022] [Accepted: 06/13/2022] [Indexed: 11/17/2022] Open
Abstract
Peripheral nerve injury (PNI) is a clinical problem with high morbidity that can cause severe damage. Surgical suturing or implants are usually required due to the slow speed and numerous factors affecting repair after PNI. An autologous nerve graft is the gold standard for PNI repair among implants. However, there is a potential problem of the functional loss of the donor site. Therefore, tissue-engineered nerve biomaterials are often used to bridge the gap between nerve defects, but the therapeutic effect is insufficient. In order to enhance the repair effect of nerve biomaterials for PNI, researchers are seeking to combine various stimulation elements, such as the addition of biological factors such as nerve growth factors or physical factors such as internal microstructural modifications of catheters and their combined application with physical stimulation therapy. Physical stimulation therapy is safer, is more convenient, and has more practical features than other additive factors. Its feasibility and convenience, when combined with nerve biomaterials, provide broader application prospects for PNI repair, and has therefore become a research hot spot. This paper will review the combined application of physical stimulation and biomaterials in PNI repair in recent years to provide new therapeutic ideas for the future use of physical stimulation in PNI repair.
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Kolluru C, Todd A, Upadhye AR, Liu Y, Berezin MY, Fereidouni F, Levenson RM, Wang Y, Shoffstall AJ, Jenkins MW, Wilson DL. Imaging peripheral nerve micro-anatomy with MUSE, 2D and 3D approaches. Sci Rep 2022; 12:10205. [PMID: 35715554 PMCID: PMC9205958 DOI: 10.1038/s41598-022-14166-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 06/02/2022] [Indexed: 01/25/2023] Open
Abstract
Understanding peripheral nerve micro-anatomy can assist in the development of safe and effective neuromodulation devices. However, current approaches for imaging nerve morphology at the fiber level are either cumbersome, require substantial instrumentation, have a limited volume of view, or are limited in resolution/contrast. We present alternative methods based on MUSE (Microscopy with Ultraviolet Surface Excitation) imaging to investigate peripheral nerve morphology, both in 2D and 3D. For 2D imaging, fixed samples are imaged on a conventional MUSE system either label free (via auto-fluorescence) or after staining with fluorescent dyes. This method provides a simple and rapid technique to visualize myelinated nerve fibers at specific locations along the length of the nerve and perform measurements of fiber morphology (e.g., axon diameter and g-ratio). For 3D imaging, a whole-mount staining and MUSE block-face imaging method is developed that can be used to characterize peripheral nerve micro-anatomy and improve the accuracy of computational models in neuromodulation. Images of rat sciatic and human cadaver tibial nerves are presented, illustrating the applicability of the method in different preclinical models.
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Affiliation(s)
- Chaitanya Kolluru
- grid.67105.350000 0001 2164 3847Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106 USA
| | - Austin Todd
- grid.267309.90000 0001 0629 5880University of Texas Health Science Center at San Antonio, San Antonio, TX 78229 USA
| | - Aniruddha R. Upadhye
- grid.67105.350000 0001 2164 3847Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106 USA ,grid.410349.b0000 0004 5912 6484APT Center, Louis Stokes Cleveland VA Medical Center, Cleveland, OH 44106 USA
| | - Yehe Liu
- grid.67105.350000 0001 2164 3847Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106 USA
| | - Mikhail Y. Berezin
- grid.4367.60000 0001 2355 7002Department of Radiology, Washington University in St. Louis, St. Louis, MO 63110 USA
| | - Farzad Fereidouni
- grid.416958.70000 0004 0413 7653Department of Pathology and Laboratory Medicine, UC Davis Health, Sacramento, CA 95817 USA
| | - Richard M. Levenson
- grid.416958.70000 0004 0413 7653Department of Pathology and Laboratory Medicine, UC Davis Health, Sacramento, CA 95817 USA
| | - Yanming Wang
- grid.67105.350000 0001 2164 3847Department of Radiology, Case Western Reserve University, Cleveland, OH 44106 USA
| | - Andrew J. Shoffstall
- grid.67105.350000 0001 2164 3847Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106 USA ,grid.410349.b0000 0004 5912 6484APT Center, Louis Stokes Cleveland VA Medical Center, Cleveland, OH 44106 USA
| | - Michael W. Jenkins
- grid.67105.350000 0001 2164 3847Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106 USA ,grid.67105.350000 0001 2164 3847Department of Pediatrics, Case Western Reserve University, Cleveland, OH 44106 USA
| | - David L. Wilson
- grid.67105.350000 0001 2164 3847Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106 USA ,grid.67105.350000 0001 2164 3847Department of Radiology, Case Western Reserve University, Cleveland, OH 44106 USA
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Schenk MS, Wartak A, Buehler V, Zhao J, Tearney GJ, Birngruber R, Kassumeh S. Advances in Imaging of Subbasal Corneal Nerves With Micro-Optical Coherence Tomography. Transl Vis Sci Technol 2021; 10:22. [PMID: 34779835 PMCID: PMC8606792 DOI: 10.1167/tvst.10.13.22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Purpose To investigate the most peripheral corneal nerve plexus using high-resolution micro-optical coherence tomography (µOCT) imaging and to assess µOCT's clinical potential as a screening tool for corneal and systemic diseases. Methods An experimental high-resolution (1.5 × 1.5 × 1 µm) µOCT setup was applied for three-dimensional imaging of the subbasal nerve plexus in nonhuman primates (NHPs) and swine within 3 hours postmortem. Morphologic features of subbasal nerves in µOCT were compared to β3 tubulin-stained fluorescence confocal microscopy (FCM). Parameters such as nerve density, nerve distribution, and imaging repeatability were evaluated, using semiautomatic image analysis in form of a custom corneal surface segmentation algorithm and NeuronJ. Results Swine and NHP corneas showed the species-specific nerve morphology in both imaging modalities. Most fibers showed a linear course, forming a highly parallel pattern, converging in a vortex with overall nerve densities varying between 9.51 and 24.24 mm/mm2. The repeatability of nerve density quantification of the µOCT scans as approximately 88% in multiple image recordings of the same cornea. Conclusions Compared to the current gold standard of FCM, µOCT's larger field of view of currently 1 × 1 mm increases the conclusiveness of density measurements, which, coupled with µOCT's feature of not requiring direct contact, shows promise for future clinical application. The nerve density quantification may be relevant for screening for systemic disease (e.g., peripheral neuropathy). Translational Relevance Technological advances in OCT technology may enable a quick assessment of corneal nerve density, which could be valuable evaluating ophthalmic and systemic peripheral innervation.
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Affiliation(s)
- Merle S Schenk
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Department of Ophthalmology, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Andreas Wartak
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Department of Dermatology, Harvard Medical School, Harvard University, Boston, MA, USA
| | - Verena Buehler
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Institute of Biomedical Optics, University of Luebeck, Luebeck, Germany
| | - Jie Zhao
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA
| | - Guillermo J Tearney
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, USA
| | - Reginald Birngruber
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Institute of Biomedical Optics, University of Luebeck, Luebeck, Germany
| | - Stefan Kassumeh
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Department of Ophthalmology, Ludwig-Maximilians-University Munich, Munich, Germany
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Cai M, Shao J, Yung B, Wang Y, Gao NN, Xu X, Zhang HH, Feng YM, Yao DB. Baculoviral inhibitor of apoptosis protein repeat-containing protein 3 delays early Wallerian degeneration after sciatic nerve injury. Neural Regen Res 2021; 17:845-853. [PMID: 34472485 PMCID: PMC8530132 DOI: 10.4103/1673-5374.322474] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Wallerian degeneration is a complex biological process that occurs after nerve injury, and involves nerve degeneration and regeneration. Schwann cells play a crucial role in the cellular and molecular events of Wallerian degeneration of the peripheral nervous system. However, Wallerian degeneration regulating nerve injury and repair remains largely unknown, especially the early response. We have previously reported some key regulators of Wallerian degeneration after sciatic nerve injury. Baculoviral inhibitor of apoptosis protein repeat-containing protein 3 (BIRC3) is an important factor that regulates apoptosis-inhibiting protein. In this study, we established rat models of right sciatic nerve injury. In vitro Schwann cell models were also established and subjected to gene transfection to inhibit and overexpress BIRC3. The data indicated that BIRC3 expression was significantly up-regulated after sciatic nerve injury. Both BIRC3 upregulation and downregulation affected the migration, proliferation and apoptosis of Schwan cells and affected the expression of related factors through activating c-fos and ERK signal pathway. Inhibition of BIRC3 delayed early Wallerian degeneration through inhibiting the apoptosis of Schwann cells after sciatic nerve injury. These findings suggest that BIRC3 plays an important role in peripheral nerve injury repair and regeneration. The study was approved by the Institutional Animal Care and Use Committee of Nantong University, China (approval No. 2019-nsfc004) on March 1, 2019.
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Affiliation(s)
- Min Cai
- Nantong University Medical School; School of Life Sciences, Jiangsu Key Laboratory of Neuroregeneration, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
| | - Jian Shao
- School of Life Sciences, Jiangsu Key Laboratory of Neuroregeneration, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
| | - Bryant Yung
- School of Life Sciences, Jiangsu Key Laboratory of Neuroregeneration, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
| | - Yi Wang
- School of Life Sciences, Jiangsu Key Laboratory of Neuroregeneration, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
| | - Nan-Nan Gao
- School of Life Sciences, Jiangsu Key Laboratory of Neuroregeneration, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
| | - Xi Xu
- Department of Hand Surgery, China-Japan Union Hospital of Jilin University, Changchun, Jilin Province, China
| | - Huan-Huan Zhang
- School of Life Sciences, Jiangsu Key Laboratory of Neuroregeneration, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
| | - Yu-Mei Feng
- School of Life Sciences, Jiangsu Key Laboratory of Neuroregeneration, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
| | - Deng-Bing Yao
- Nantong University Medical School; School of Life Sciences, Jiangsu Key Laboratory of Neuroregeneration, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu Province, China
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Yu T, Li D, Zhu D. Tissue Optical Clearing for Biomedical Imaging: From In Vitro to In Vivo. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 3233:217-255. [PMID: 34053030 DOI: 10.1007/978-981-15-7627-0_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Tissue optical clearing technique provides a prospective solution for the application of advanced optical methods in life sciences. This chapter firstly gives a brief introduction to mechanisms of tissue optical clearing techniques, from the physical mechanism to chemical mechanism, which is the most important foundation to develop tissue optical clearing methods. During the past years, in vitro and in vivo tissue optical clearing methods were developed. In vitro tissue optical clearing techniques, including the solvent-based clearing methods and the hydrophilic reagents-based clearing methods, combined with labeling technique and advanced microscopy, can be applied to image 3D microstructure of tissue blocks or whole organs such as brain and spinal cord with high resolution. In vivo skin or skull optical clearing, promise various optical imaging techniques to detect cutaneous or cortical cell and vascular structure and function without surgical window.
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Affiliation(s)
- Tingting Yu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei, China.,MoE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Dongyu Li
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei, China.,MoE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Dan Zhu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei, China. .,MoE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei, China.
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Pop NL, Nan A, Urda-Cimpean AE, Florea A, Toma VA, Moldovan R, Decea N, Mitrea DR, Orasan R. Chitosan Functionalized Magnetic Nanoparticles to Provide Neural Regeneration and Recovery after Experimental Model Induced Peripheral Nerve Injury. Biomolecules 2021; 11:676. [PMID: 33946445 PMCID: PMC8147170 DOI: 10.3390/biom11050676] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 04/26/2021] [Accepted: 04/28/2021] [Indexed: 12/11/2022] Open
Abstract
(1) Background: Peripheral nerve injuries have a great impact on a patient's quality of life and a generally poor outcome regarding functional recovery. Lately, studies have focused on different types of nanoparticles and various natural substances for the treatment of peripheral nerve injuries. This is the case of chitosan, a natural compound from the crustaceans' exoskeleton. The present study proposes to combine chitosan benefic properties to the nanoparticles' ability to transport different substances to specific locations and evaluate the effects of magnetic nanoparticles functionalized with chitosan (CMNPs) on peripheral nerve injuries' rehabilitation by using an in vivo experimental model. (2) Methods: CMNPs treatment was administrated daily, orally, for 21 days to rats subjected to right sciatic nerve lesion and compared to the control group (no treatment) by analyzing the sciatic functional index, pain level, body weight, serum nerve growth factor levels and histology, TEM and EDX analysis at different times during the study. (3) Results: Animals treated with CMNPs had a statistically significant functional outcome compared to the control group regarding: sciatic functional index, pain-like behavior, total body weight, which were confirmed by the histological and TEM images. (4) Conclusions: The results of the study suggest that CMNPs appear to be a promising treatment method for peripheral nerve injuries.
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Affiliation(s)
- Nadina Liana Pop
- Department of Physiology, Iuliu Hațieganu University of Medicine and Pharmacy Cluj-Napoca, Clinicilor Street No. 1-3, 400006 Cluj-Napoca, Cluj County, Romania; (N.L.P.); (R.M.); (N.D.); (R.O.)
| | - Alexandrina Nan
- National Institute for Research and Development of Isotopic and Molecular Technologies, Donath Street No. 67-103, 400293 Cluj-Napoca, Cluj County, Romania;
| | - Andrada Elena Urda-Cimpean
- Department of Informatics and Biostatistics, Iuliu Hațieganu University of Medicine and Pharmacy Cluj-Napoca, Pasteur Street No. 4-6, 400349 Cluj-Napoca, Cluj County, Romania;
| | - Adrian Florea
- Department of Cell and Molecular Biology, Iuliu Haţieganu University of Medicine and Pharmacy, Pasteur Street No. 4-6, 400349 Cluj-Napoca, Cluj County, Romania;
| | - Vlad Alexandru Toma
- Department of Molecular Biology and Biotechnologies, Babeș-Bolyai University, Clinicilor Street No. 4-6, 400000 Cluj-Napoca, Cluj County, Romania;
- Institute of Biological Research, Republicii Street No. 48, 400015 Cluj-Napoca, Cluj County, Romania
| | - Remus Moldovan
- Department of Physiology, Iuliu Hațieganu University of Medicine and Pharmacy Cluj-Napoca, Clinicilor Street No. 1-3, 400006 Cluj-Napoca, Cluj County, Romania; (N.L.P.); (R.M.); (N.D.); (R.O.)
| | - Nicoleta Decea
- Department of Physiology, Iuliu Hațieganu University of Medicine and Pharmacy Cluj-Napoca, Clinicilor Street No. 1-3, 400006 Cluj-Napoca, Cluj County, Romania; (N.L.P.); (R.M.); (N.D.); (R.O.)
| | - Daniela Rodica Mitrea
- Department of Physiology, Iuliu Hațieganu University of Medicine and Pharmacy Cluj-Napoca, Clinicilor Street No. 1-3, 400006 Cluj-Napoca, Cluj County, Romania; (N.L.P.); (R.M.); (N.D.); (R.O.)
| | - Remus Orasan
- Department of Physiology, Iuliu Hațieganu University of Medicine and Pharmacy Cluj-Napoca, Clinicilor Street No. 1-3, 400006 Cluj-Napoca, Cluj County, Romania; (N.L.P.); (R.M.); (N.D.); (R.O.)
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Kolluru C, Subramaniam A, Liu Y, Upadhye A, Khela M, Druschel L, Fereidouni F, Levenson R, Shoffstall A, Jenkins M, Wilson DL. 3D imaging of the vagus nerve fascicular anatomy with cryo-imaging and UV excitation. PROCEEDINGS OF SPIE--THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING 2021; 11649:1164910. [PMID: 35313654 PMCID: PMC8934573 DOI: 10.1117/12.2577037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Vagus nerve stimulation (VNS) is a method to treat drug-resistant epilepsy and depression, but therapeutic outcomes are often not ideal. Newer electrode designs such as intra-fascicular electrodes offer potential improvements in reducing off-target effects but require a detailed understanding of the fascicular anatomy of the vagus nerve. We have adapted a section-and-image technique, cryo-imaging, with UV excitation to visualize fascicles along the length of the vagus nerve. In addition to offering optical sectioning at the surface via reduced penetration depth, UV illumination also produces sufficient contrast between fascicular structures and connective tissue. Here we demonstrate the utility of this approach in pilot experiments. We imaged fixed, cadaver vagus nerve samples, segmented fascicles, and demonstrated 3D tracking of fascicles. Such data can serve as input for computer models of vagus nerve stimulation.
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Affiliation(s)
- Chaitanya Kolluru
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA
| | - Ananya Subramaniam
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA
| | - Yehe Liu
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA
| | - Aniruddha Upadhye
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA
| | - Monty Khela
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA
| | - Lindsey Druschel
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA
| | | | | | - Andrew Shoffstall
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA
| | - Michael Jenkins
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA
| | - David L. Wilson
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA
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NEUROINDUCED MESENCHYMAL STEM CELLS EFFICIENCY FOR RECONSTRUCTION OF RAT SCIATIC NERVE DEFECTS. WORLD OF MEDICINE AND BIOLOGY 2021. [DOI: 10.26724/2079-8334-2021-1-75-210-214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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9
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Wartak A, Schenk MS, Bühler V, Kassumeh SA, Birngruber R, Tearney GJ. Micro-optical coherence tomography for high-resolution morphologic imaging of cellular and nerval corneal micro-structures. BIOMEDICAL OPTICS EXPRESS 2020; 11:5920-5933. [PMID: 33149996 PMCID: PMC7587290 DOI: 10.1364/boe.402971] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 08/31/2020] [Accepted: 09/13/2020] [Indexed: 05/15/2023]
Abstract
We demonstrate the highest resolution (1.5×1.5×1 µm) micrometer optical coherence tomography (µOCT) imaging of the morphologic micro-structure of excised swine and non-human primate corneas. Besides epithelial, stromal, and endothelial cell morphology, this report focuses on investigating the most peripheral corneal nerve fibers, the nerve fibers of the subbasal plexus (SBP). Alterations of SBP nerve density and composition are reportedly linked to major neurologic disorders, such as diabetic neuropathy, potentially indicating earliest onsets of denervation. Here, the fine, hyperreflective, epithelial nerve structures located just above Bowman's membrane, are i) visualized using our µOCT prototype, ii) validated by comparison to fluorescence confocal microscopy (including selective immunohistochemical staining), and iii) segmented using state-of-the-art image processing. Here, we also introduce polarization sensitive (PS) µOCT imaging, demonstrating, to the best of our knowledge, the highest resolution corneal PS-OCT scans reported to date.
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Affiliation(s)
- Andreas Wartak
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Dermatology, Harvard Medical School, Harvard University, Boston, MA 02115, USA
- co-first authors
| | - Merle S. Schenk
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Ophthalmology, University Hospital, LMU Munich, Munich 80336, Germany
- co-first authors
| | - Verena Bühler
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Institute of Biomedical Optics, University of Lübeck, Lübeck 23562, Germany
| | - Stefan A. Kassumeh
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Ophthalmology, University Hospital, LMU Munich, Munich 80336, Germany
| | - Reginald Birngruber
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Institute of Biomedical Optics, University of Lübeck, Lübeck 23562, Germany
- co-senior authors
| | - Guillermo J. Tearney
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
- Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA 02139, USA
- co-senior authors
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10
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Gao Y, Hu YW, Duan RS, Yang SG, Zhou FQ, Wang RY. Time course analysis of sensory axon regeneration in vivo by directly tracing regenerating axons. Neural Regen Res 2020; 15:1160-1165. [PMID: 31823897 PMCID: PMC7034291 DOI: 10.4103/1673-5374.270315] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2019] [Revised: 08/02/2019] [Accepted: 09/17/2019] [Indexed: 12/29/2022] Open
Abstract
Most current studies quantify axon regeneration by immunostaining regeneration-associated proteins, representing indirect measurement of axon lengths from both sensory neurons in the dorsal root ganglia and motor neurons in the spinal cord. Our recently developed method of in vivo electroporation of plasmid DNA encoding for enhanced green fluorescent protein into adult sensory neurons in the dorsal root ganglia provides a way to directly and specifically measure regenerating sensory axon lengths in whole-mount nerves. A mouse model of sciatic nerve compression was established by squeezing the sciatic nerve with tweezers. Plasmid DNA carrying enhanced green fluorescent protein was transfected by ipsilateral dorsal root ganglion electroporation 2 or 3 days before injury. Fluorescence distribution of dorsal root or sciatic nerve was observed by confocal microscopy. At 12 and 18 hours, and 1, 2, 3, 4, 5, and 6 days of injury, lengths of regenerated axons after sciatic nerve compression were measured using green fluorescence images. Apoptosis-related protein caspase-3 expression in dorsal root ganglia was determined by western blot assay. We found that in vivo electroporation did not affect caspase-3 expression in dorsal root ganglia. Dorsal root ganglia and sciatic nerves were successfully removed and subjected to a rapid tissue clearing technique. Neuronal soma in dorsal root ganglia expressing enhanced green fluorescent protein or fluorescent dye-labeled microRNAs were imaged after tissue clearing. The results facilitate direct time course analysis of peripheral nerve axon regeneration. This study was approved by the Institutional Animal Care and Use Committee of Guilin Medical University, China (approval No. GLMC201503010) on March 7, 2014.
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Affiliation(s)
- Yan Gao
- Guilin Medical University, Guilin, Guangxi Zhuang Autonomous Region, China
| | - Yi-Wen Hu
- Department of Orthopedic Surgery, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi Zhuang Autonomous Region, China
| | - Run-Shan Duan
- Department of Orthopedics, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou, Henan Province, China
| | - Shu-Guang Yang
- Department of Orthopedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Feng-Quan Zhou
- Department of Orthopedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Rui-Ying Wang
- Department of Orthopedic Surgery, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi Zhuang Autonomous Region, China
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11
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Characterising cellular and molecular features of human peripheral nerve degeneration. Acta Neuropathol Commun 2020; 8:51. [PMID: 32303273 PMCID: PMC7164159 DOI: 10.1186/s40478-020-00921-w] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 03/26/2020] [Indexed: 12/23/2022] Open
Abstract
Nerve regeneration is a key biological process in those recovering from neural trauma. From animal models it is known that the regenerative capacity of the peripheral nervous system (PNS) relies heavily on the remarkable ability of Schwann cells to undergo a phenotypic shift from a myelinating phenotype to one that is supportive of neural regeneration. In rodents, a great deal is known about the molecules that control this process, such as the transcription factors c-Jun and early growth response protein 2 (EGR2/KROX20), or mark the cells and cellular changes involved, including SOX10 and P75 neurotrophin receptor (p75NTR). However, ethical and practical challenges associated with studying human nerve injury have meant that little is known about human nerve regeneration.The present study addresses this issue, analysing 34 denervated and five healthy nerve samples from 27 patients retrieved during reconstructive nerve procedures. Using immunohistochemistry and Real-Time quantitative Polymerase Chain Reaction (RT-qPCR), the expression of SOX10, c-Jun, p75NTR and EGR2 was assessed in denervated samples and compared to healthy nerve. Nonparametric smoothing linear regression was implemented to better visualise trends in the expression of these markers across denervated samples.It was found, first, that two major genes associated with repair Schwann cells in rodents, c-Jun and p75NTR, are also up-regulated in acutely injured human nerves, while the myelin associated transcription factor EGR2 is down-regulated, observations that encourage the view that rodent models are relevant for learning about human nerve injury. Second, as in rodents, the expression of c-Jun and p75NTR declines during long-term denervation. In rodents, diminishing c-Jun and p75NTR levels mark the general deterioration of repair cells during chronic denervation, a process thought to be a major obstacle to effective nerve repair. The down-regulation of c-Jun and p75NTR reported here provides the first molecular evidence that also in humans, repair cells deteriorate during chronic denervation.
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12
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Elhardt C, Wertheimer CM, Wartak A, Zhao J, Leung HM, Kassumeh SA, Yin B, Tearney GJ, Birngruber R. Stromal Nerve Imaging and Tracking Using Micro-Optical Coherence Tomography. Transl Vis Sci Technol 2020; 9:6. [PMID: 32821478 PMCID: PMC7401960 DOI: 10.1167/tvst.9.5.6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 01/12/2020] [Indexed: 12/26/2022] Open
Abstract
Purpose To image, track and map the nerve fiber distribution in excised rabbit corneas over the entire stromal thickness using micro-optical coherence tomography (µOCT) to develop a screening tool for early peripheral neuropathy. Methods Excised rabbit corneas were consecutively imaged by a custom-designed µOCT prototype and a commercial laser scanning fluorescence confocal microscope. The µOCT images with a field of view of approximately 1 × 1 mm were recorded with axial and transverse resolutions of approximately 1 µm and approximately 4 µm, respectively. In the volumetric µOCT image data, network maps of hyper-reflective, branched structures traversing different stromal compartments were segmented using semiautomatic image processing algorithms. Furthermore, the same corneas received βIII-tubulin antibody immunostaining before digital confocal microscopy, and a comparison between µOCT image data and immunohistochemistry analysis was performed to validate the nerval origin of the tracked network structures. Results Semiautomatic tracing of the nerves with a high range of different thicknesses was possible through the whole corneal volumes, creating a skeleton of the traced nerves. There was a good conformity between the hyper-reflective structures in the µOCT data and the stained nerval structures in the immunohistochemistry data. Conclusions This article demonstrates nerval imaging and tracking as well as a spatial correlation between µOCT and a fluorescence corneal nerve standard for larger nerves throughout the full thickness of the cornea ex vivo. Translational Relevance Owing to its advantageous properties, µOCT may become useful as a noncontact method for assessing nerval structures in humans to screen for early peripheral neuropathy.
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Affiliation(s)
- Carolin Elhardt
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Department of Ophthalmology, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Christian M Wertheimer
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Department of Ophthalmology, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Andreas Wartak
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Harvard Medical School, Boston, MA, USA
| | - Jie Zhao
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Harvard Medical School, Boston, MA, USA
| | - Hui Min Leung
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Harvard Medical School, Boston, MA, USA
| | - Stefan A Kassumeh
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Department of Ophthalmology, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Biwei Yin
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Harvard Medical School, Boston, MA, USA
| | - Guillermo J Tearney
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Harvard Medical School, Boston, MA, USA.,Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, USA.,Department of Pathology, Harvard Medical School and Massachusetts General Hospital, Boston, MA, USA
| | - Reginald Birngruber
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA.,Institute of Biomedical Optics, University of Lübeck, Lübeck, Germany
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13
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Porter DDL, Morton PD. Clearing techniques for visualizing the nervous system in development, injury, and disease. J Neurosci Methods 2020; 334:108594. [PMID: 31945400 PMCID: PMC10674098 DOI: 10.1016/j.jneumeth.2020.108594] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 01/09/2020] [Accepted: 01/10/2020] [Indexed: 01/05/2023]
Abstract
Modern clearing techniques enable high resolution visualization and 3D reconstruction of cell populations and their structural details throughout large biological samples, including intact organs and even entire organisms. In the past decade, these methods have become more tractable and are now being utilized to provide unforeseen insights into the complexities of the nervous system. While several iterations of optical clearing techniques have been developed, some are more suitable for specific applications than others depending on the type of specimen under study. Here we review findings from select studies utilizing clearing methods to visualize the developing, injured, and diseased nervous system within numerous model systems and species. We note trends and imbalances in the types of research questions being addressed with clearing methods across these fields in neuroscience. In addition, we discuss restrictions in applying optical clearing methods for postmortem tissue from humans and large animals and emphasize the lack in continuity between studies of these species. We aim for this review to serve as a key outline of available tissue clearing methods used successfully to address issues across neuronal development, injury/repair, and aging/disease.
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Affiliation(s)
- Demisha D L Porter
- Virginia Tech Graduate Program in Translational Biology, Medicine and Health, Virginia Polytechnic Institute and State University, Roanoke, VA, USA
| | - Paul D Morton
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA.
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14
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Luzhansky ID, Sudlow LC, Brogan DM, Wood MD, Berezin MY. Imaging in the repair of peripheral nerve injury. Nanomedicine (Lond) 2019; 14:2659-2677. [PMID: 31612779 PMCID: PMC6886568 DOI: 10.2217/nnm-2019-0115] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 08/20/2019] [Indexed: 12/25/2022] Open
Abstract
Surgical intervention followed by physical therapy remains the major way to repair damaged nerves and restore function. Imaging constitutes promising, yet underutilized, approaches to improve surgical and postoperative techniques. Dedicated methods for imaging nerve regeneration will potentially provide surgical guidance, enable recovery monitoring and postrepair intervention, elucidate failure mechanisms and optimize preclinical procedures. Herein, we present an outline of promising innovations in imaging-based tracking of in vivo peripheral nerve regeneration. We emphasize optical imaging because of its cost, versatility, relatively low toxicity and sensitivity. We discuss the use of targeted probes and contrast agents (small molecules and nanoparticles) to facilitate nerve regeneration imaging and the engineering of grafts that could be used to track nerve repair. We also discuss how new imaging methods might overcome the most significant challenges in nerve injury treatment.
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Affiliation(s)
- Igor D Luzhansky
- Department of Radiology, Washington University School of Medicine, St Louis, MO 63110, USA
- The Institute of Materials Science & Engineering, Washington University, St Louis, MO 63130, USA
| | - Leland C Sudlow
- Department of Radiology, Washington University School of Medicine, St Louis, MO 63110, USA
| | - David M Brogan
- Department of Orthopedic Surgery, Washington University School of Medicine, St Louis, MO 63110, USA
| | - Matthew D Wood
- Department of Surgery, Washington University School of Medicine, St Louis, MO 63110, USA
| | - Mikhail Y Berezin
- Department of Radiology, Washington University School of Medicine, St Louis, MO 63110, USA
- The Institute of Materials Science & Engineering, Washington University, St Louis, MO 63130, USA
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15
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Fogli B, Corthout N, Kerstens A, Bosse F, Klimaschewski L, Munck S, Schweigreiter R. Imaging axon regeneration within synthetic nerve conduits. Sci Rep 2019; 9:10095. [PMID: 31300753 PMCID: PMC6626049 DOI: 10.1038/s41598-019-46579-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Accepted: 06/28/2019] [Indexed: 11/23/2022] Open
Abstract
While axons within the central nervous system (CNS) do not regenerate following injury, those in the peripheral nervous system (PNS) do, although not in a clinically satisfactory manner as only a small proportion of axons exhibit long-distance regeneration. Moreover, functional recovery is hampered by excessive axonal sprouting and aberrant reinnervation of target tissue. In order to investigate the mechanisms governing the regrowth of axons following injury, previous studies have used lesion paradigms of peripheral nerves in rat or mouse models, and reagents or cells have been administered to the lesion site through nerve conduits, aiming to improve early-stage regeneration. Morphological analysis of such in vivo experiments has however been limited by the incompatibility of synthetic nerve conduits with existing tissue-clearing and imaging techniques. We present herein a novel experimental approach that allows high-resolution imaging of individual axons within nerve conduits, together with quantitative assessment of fiber growth. We used a GFP-expressing mouse strain in a lesion model of the sciatic nerve to describe a strategy that combines nerve clearing, chemical treatment of chitosan nerve conduits, and long working distance confocal microscopy with image processing and analysis. This novel experimental setup provides a means of documenting axon growth within the actual conduit during the critical initial stage of regeneration. This will greatly facilitate the development and evaluation of treatment regimens to improve axonal regeneration following nerve damage.
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Affiliation(s)
- Barbara Fogli
- Innsbruck Medical University, Department of Anatomy, Histology and Embryology, Division of Neuroanatomy, 6020, Innsbruck, Austria
| | - Nikky Corthout
- VIB-KU Leuven Center for Brain & Disease Research O&N 4, Campus Gasthuisberg, 3000, Leuven, Belgium.,KU Leuven, Department for Neuroscience, Campus Gasthuisberg, 3000, Leuven, Belgium.,VIB Bio Imaging Core, Campus Gasthuisberg, 3000, Leuven, Belgium
| | - Axelle Kerstens
- VIB-KU Leuven Center for Brain & Disease Research O&N 4, Campus Gasthuisberg, 3000, Leuven, Belgium.,KU Leuven, Department for Neuroscience, Campus Gasthuisberg, 3000, Leuven, Belgium.,VIB Bio Imaging Core, Campus Gasthuisberg, 3000, Leuven, Belgium
| | - Frank Bosse
- Heinrich-Heine-University Düsseldorf, Department of Neurology, Molecular Neurobiology Laboratory, 40225, Düsseldorf, Germany
| | - Lars Klimaschewski
- Innsbruck Medical University, Department of Anatomy, Histology and Embryology, Division of Neuroanatomy, 6020, Innsbruck, Austria
| | - Sebastian Munck
- VIB-KU Leuven Center for Brain & Disease Research O&N 4, Campus Gasthuisberg, 3000, Leuven, Belgium. .,KU Leuven, Department for Neuroscience, Campus Gasthuisberg, 3000, Leuven, Belgium. .,VIB Bio Imaging Core, Campus Gasthuisberg, 3000, Leuven, Belgium.
| | - Rüdiger Schweigreiter
- Innsbruck Medical University, Biocenter, Division of Neurobiochemistry, 6020, Innsbruck, Austria.
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16
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Rodríguez Sánchez DN, de Lima Resende LA, Boff Araujo Pinto G, de Carvalho Bovolato AL, Possebon FS, Deffune E, Amorim RM. Canine Adipose-Derived Mesenchymal Stromal Cells Enhance Neuroregeneration in a Rat Model of Sciatic Nerve Crush Injury. Cell Transplant 2019; 28:47-54. [PMID: 30369261 PMCID: PMC6322136 DOI: 10.1177/0963689718809045] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 09/27/2018] [Accepted: 10/01/2018] [Indexed: 12/24/2022] Open
Abstract
Crush injuries in peripheral nerves are frequent and induce long-term disability with motor and sensory deficits. Due to axonal and myelin sheath disruptions, strategies for optimized axonal regeneration are needed. Multipotent mesenchymal stromal cells (MSC) are promising because of their anti-inflammatory properties and secretion of neurotrophins. The present study investigated the effect of canine adipose tissue MSC (Ad-MSC) transplantation in an experimental sciatic nerve crush injury. Wistar rats were divided into three groups: sham ( n = 8); Crush+PBS ( n = 8); Crush+MSC ( n = 8). Measurements of sciatic nerve functional index (SFI), muscle mass, and electromyography (EMG) were performed. Canine Ad-MSC showed mesodermal characteristics (CD34-, CD45-, CD44+, CD90+ and CD105+) and multipotentiality due to chondrogenic, adipogenic, and osteogenic differentiation. SFI during weeks 3 and 4 was significantly higher in the Crush+MSC group ( p < 0.001). During week 4, the EMG latency in the Crush+MSC groups had better near normality ( p < 0.05). The EMG amplitude showed results close to normality during week 4 in the Crush+MSC group ( p < 0.04). There were no statistical differences in muscle weight between the groups ( p > 0.05), but there was a tendency toward weight gain in the Crush+MSC groups. Better motor functional recovery after crush and perineural canine Ad-MSC transplantation was observed during week 2. This was maintained till week 4. In conclusion, the canine Ad-MSC transplantation showed early pro-regenerative effects between 2-4 weeks in the rat model of sciatic nerve crush injury.
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Affiliation(s)
- Diego Noé Rodríguez Sánchez
- Department of Veterinary Clinics, School of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), São Paulo, Brazil
- Blood Transfusion Center, Cell Engineering Laboratory, Botucatu Medical School, São Paulo State University (UNESP), São Paulo, Brazil
| | - Luiz Antonio de Lima Resende
- Department of Neurology and Psychiatry, Botucatu Medical School, São Paulo State University (UNESP), São Paulo, Brazil
| | - Giovana Boff Araujo Pinto
- Department of Veterinary Clinics, School of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), São Paulo, Brazil
- Blood Transfusion Center, Cell Engineering Laboratory, Botucatu Medical School, São Paulo State University (UNESP), São Paulo, Brazil
| | - Ana Lívia de Carvalho Bovolato
- Blood Transfusion Center, Cell Engineering Laboratory, Botucatu Medical School, São Paulo State University (UNESP), São Paulo, Brazil
| | - Fábio Sossai Possebon
- Department of Veterinary Hygiene and Public Health, College of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), São Paulo, Brazil
| | - Elenice Deffune
- Blood Transfusion Center, Cell Engineering Laboratory, Botucatu Medical School, São Paulo State University (UNESP), São Paulo, Brazil
| | - Rogério Martins Amorim
- Department of Veterinary Clinics, School of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), São Paulo, Brazil
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17
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Wide-Field Functional Microscopy of Peripheral Nerve Injury and Regeneration. Sci Rep 2018; 8:14004. [PMID: 30228335 PMCID: PMC6143548 DOI: 10.1038/s41598-018-32346-w] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 08/31/2018] [Indexed: 12/14/2022] Open
Abstract
Severe peripheral nerve injuries often result in partial repair and lifelong disabilities in patients. New surgical techniques and better graft tissues are being studied to accelerate regeneration and improve functional recovery. Currently, limited tools are available to provide in vivo monitoring of changes in nerve physiology such as myelination and vascularization, and this has impeded the development of new therapeutic options. We have developed a wide-field and label-free functional microscopy platform based on angiographic and vectorial birefringence methods in optical coherence tomography (OCT). By incorporating the directionality of the birefringence, which was neglected in the previously reported polarization-sensitive OCT techniques for nerve imaging, vectorial birefringence contrast reveals internal nerve microanatomy and allows for quantification of local myelination with superior sensitivity. Advanced OCT angiography is applied in parallel to image the three-dimensional vascular networks within the nerve over wide-fields. Furthermore, by combining vectorial birefringence and angiography, intraneural vessels can be discriminated from those of the surrounding tissues. The technique is used to provide longitudinal imaging of myelination and revascularization in the rodent sciatic nerve model, i.e. imaged at certain sequential time-points during regeneration. The animals were exposed to either crush or transection injuries, and in the case of transection, were repaired using an autologous nerve graft or acellular nerve allograft. Such label-free functional imaging by the platform can provide new insights into the mechanisms that limit regeneration and functional recovery, and may ultimately provide intraoperative assessment in human subjects.
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18
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Budde MD, Skinner NP. Diffusion MRI in acute nervous system injury. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2018; 292:137-148. [PMID: 29773299 DOI: 10.1016/j.jmr.2018.04.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 04/06/2018] [Accepted: 04/27/2018] [Indexed: 06/08/2023]
Abstract
Diffusion weighted magnetic resonance imaging (DWI) and related techniques such as diffusion tensor imaging (DTI) are uniquely sensitive to the microstructure of the brain and spinal cord. In the acute aftermath of nervous system injury, for example, DWI reveals changes caused by injury that remains invisible on other MRI contrasts such as T2-weighted imaging. This ability has led to a demonstrated clinical utility in cerebral ischemia. However, despite strong promise in preclinical models and research settings, DWI has not been as readily adopted for other acute injuries such as traumatic spinal cord, brain, or peripheral nerve injury. Furthermore, the precise biophysical mechanisms that underlie DWI and DTI changes are not fully understood. In this report, we review the DWI and DTI changes that occur in acute neurological injury of cerebral ischemia, spinal cord injury, traumatic brain injury, and peripheral nerve injury. Their associations with the underlying biology are examined with an emphasis on the role of acute axon and dendrite beading. Lastly, emerging DWI techniques to overcome the limitations of DTI are discussed as these may offer the needed improvements to translate to clinical settings.
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Affiliation(s)
- Matthew D Budde
- Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, WI, United States.
| | - Nathan P Skinner
- Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, WI, United States; Medical Scientist Training Program, Medical College of Wisconsin, Milwaukee, WI, United States
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19
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Li Y, Sun Y, Cai M, Zhang H, Gao N, Huang H, Cui S, Yao D. Fas Ligand Gene (Faslg) Plays an Important Role in Nerve Degeneration and Regeneration After Rat Sciatic Nerve Injury. Front Mol Neurosci 2018; 11:210. [PMID: 29970988 PMCID: PMC6018423 DOI: 10.3389/fnmol.2018.00210] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 05/28/2018] [Indexed: 01/09/2023] Open
Abstract
Wallerian degeneration (WD) is associated with changes in the expression levels of a large number of genes. However, the effects of these up- or down-regulated genes are poorly understood. We have reported some key factors that are differentially regulated during WD in our previous research. Here, we explored the roles of Fas ligand gene (Faslg) in WD after rat sciatic nerve injury. The data showed that Faslg was up-regulated in injured nerves. Expression changed of Faslg in Schwann cells (SCs) resulted in alterations in the release of related factors. Silencing or overexpression of Faslg affected SC proliferation, migration, and apoptosis through β-catenin, nuclear factor-κB (NF-κB), and caspase-3 pathways in vivo and in vitro. Our data suggest that Faslg is a key regulatory gene that affects nerve repair and regeneration in peripheral nerve injury. This study sheds new light on the effects of Faslg on peripheral nerve degeneration and/or regeneration.
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Affiliation(s)
- Yuting Li
- School of Life Sciences, Co-innovation Center of Neuroregeneration, Jiangsu Key Laboratory of Neuroregeneration, Nantong University, Nantong, China
| | - Yuhua Sun
- School of Life Sciences, Co-innovation Center of Neuroregeneration, Jiangsu Key Laboratory of Neuroregeneration, Nantong University, Nantong, China.,Genetic Laboratory, Lianyungang Maternal and Child Health Hospital, Lianyungang, China
| | - Min Cai
- School of Life Sciences, Co-innovation Center of Neuroregeneration, Jiangsu Key Laboratory of Neuroregeneration, Nantong University, Nantong, China
| | - Huanhuan Zhang
- School of Life Sciences, Co-innovation Center of Neuroregeneration, Jiangsu Key Laboratory of Neuroregeneration, Nantong University, Nantong, China
| | - Nannan Gao
- School of Life Sciences, Co-innovation Center of Neuroregeneration, Jiangsu Key Laboratory of Neuroregeneration, Nantong University, Nantong, China
| | - Huiwei Huang
- School of Medicine, Nantong University, Nantong, China
| | - Shusen Cui
- Hand Surgery, China-Japan Union Hospital, Jilin University, Changchun, China
| | - Dengbing Yao
- School of Life Sciences, Co-innovation Center of Neuroregeneration, Jiangsu Key Laboratory of Neuroregeneration, Nantong University, Nantong, China
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20
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Poon KWC, Brideau C, Klaver R, Schenk GJ, Geurts JJ, Stys PK. Lipid biochemical changes detected in normal appearing white matter of chronic multiple sclerosis by spectral coherent Raman imaging. Chem Sci 2018; 9:1586-1595. [PMID: 29675203 PMCID: PMC5890326 DOI: 10.1039/c7sc03992a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 12/26/2017] [Indexed: 01/09/2023] Open
Abstract
Multiple sclerosis (MS) exhibits demyelination, inflammatory infiltration, axonal degeneration, and gliosis, affecting widespread regions of the central nervous system (CNS). While white matter MS lesions have been well characterized pathologically, evidence indicates that the MS brain may be globally altered, with subtle abnormalities found in grossly normal appearing white matter (NAWM). These subtle changes are difficult to investigate by common methods such as histochemical stains and conventional magnetic resonance imaging. Thus, the prototypical inflammatory lesion likely represents the most obvious manifestation of a more widespread involvement of the CNS. We describe the application of spectral coherent anti-Stokes Raman Scattering (sCARS) microscopy to study such changes in chronic MS tissue particularly in NAWM. Subtle changes in myelin lipid biochemical signatures and intra-molecular disorder of fatty acid acyl chains of otherwise normal-appearing myelin were detected, supporting the notion that the biochemical involvement of the MS brain is far more extensive than conventional methods would suggest.
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Affiliation(s)
- K W C Poon
- Hotchkiss Brain Institute , Cumming School of Medicine , University of Calgary , Canada .
| | - C Brideau
- Hotchkiss Brain Institute , Cumming School of Medicine , University of Calgary , Canada .
| | - R Klaver
- Department of Anatomy and Neurosciences , Vrije University Medical Center , Amsterdam , The Netherlands .
| | - G J Schenk
- Department of Anatomy and Neurosciences , Vrije University Medical Center , Amsterdam , The Netherlands .
| | - J J Geurts
- Department of Anatomy and Neurosciences , Vrije University Medical Center , Amsterdam , The Netherlands .
| | - P K Stys
- Hotchkiss Brain Institute , Cumming School of Medicine , University of Calgary , Canada .
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21
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Lai HM, Ng HM, Wu W. Three-dimensional histology: new visual approaches to morphological changes during neural regeneration. Neural Regen Res 2017; 12:53-55. [PMID: 28250740 PMCID: PMC5319234 DOI: 10.4103/1673-5374.198974] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Three-dimensional (3D) histology utilizes tissue clearing techniques to turn intact tissues transparent, allowing rapid interrogation of tissue architecture in three dimensions. In this article, we summarized the available tissue clearing methods and classified them according to their physicochemical principles of operation, which provided a framework for one to choose the best techniques for various research settings. Recent attempts in addressing various questions regarding the degenerating and regenerating nervous system have been promising with the use of 3D histological techniques.
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Affiliation(s)
- Hei Ming Lai
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Ho Man Ng
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China
| | - Wutian Wu
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China; State Key Laboratory of Brain and Cognitive Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China; Research Center of Reproduction, Development and Growth, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region, China; Guangdong-Hong Kong-Macau Institute of CNS Regeneration, Jinan University, Guangzhou, Guangdong Province, China
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22
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Pan B, Liu Y, Yan JY, Wang Y, Yao X, Zhou HX, Lu L, Kong XH, Feng SQ. Gene expression analysis at multiple time-points identifies key genes for nerve regeneration. Muscle Nerve 2016; 55:373-383. [PMID: 27313142 DOI: 10.1002/mus.25225] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 06/07/2016] [Accepted: 06/14/2016] [Indexed: 02/05/2023]
Abstract
INTRODUCTION The purpose of this study was to provide a comprehensive understanding of gene expression during Wallerian degeneration and axon regeneration after peripheral nerve injury. METHODS A microarray was used to detect gene expression in the distal nerve 0, 3, 7, and 14 days after sciatic nerve crush. Bioinformatic analysis was used to predict function of the differentially expressed mRNAs. Microarray results and the key pathways were validated by quantitative real-time polymerase chain reaction (qRT-PCR). RESULTS Differentially expressed mRNAs at different time-points (3, 7, and 14 days) after injury were identified and compared with a control group (0 day). Nine general trends of changes in gene expression were identified. Key signal pathways and 9 biological processes closely associated with nerve regeneration were identified and verified. CONCLUSIONS Differentially expressed genes and biological processes and pathways associated with axonal regeneration may elucidate the molecular-biological mechanisms underlying peripheral nerve regeneration. Muscle Nerve 55: 373-383, 2017.
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Affiliation(s)
- Bin Pan
- Department of Orthopaedics, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, PR China
| | - Yi Liu
- Department of Orthopaedics, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, PR China
| | - Jia-Yin Yan
- Department of Orthopaedics, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, PR China
| | - Yao Wang
- Department of Orthopaedics, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, PR China
| | - Xue Yao
- Department of Orthopaedics, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, PR China
| | - Heng-Xing Zhou
- Department of Orthopaedics, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, PR China
| | - Lu Lu
- Department of Orthopaedics, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, PR China
| | - Xiao-Hong Kong
- School of Medicine, Nankai University, Nankai District, Tianjin, PR China
| | - Shi-Qing Feng
- Department of Orthopaedics, Tianjin Medical University General Hospital, No. 154 Anshan Road, Heping District, Tianjin, 300052, PR China
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23
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Monitoring peripheral nerve degeneration in ALS by label-free stimulated Raman scattering imaging. Nat Commun 2016; 7:13283. [PMID: 27796305 PMCID: PMC5095598 DOI: 10.1038/ncomms13283] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 09/19/2016] [Indexed: 01/02/2023] Open
Abstract
The study of amyotrophic lateral sclerosis (ALS) and potential interventions would be facilitated if motor axon degeneration could be more readily visualized. Here we demonstrate that stimulated Raman scattering (SRS) microscopy could be used to sensitively monitor peripheral nerve degeneration in ALS mouse models and ALS autopsy materials. Three-dimensional imaging of pre-symptomatic SOD1 mouse models and data processing by a correlation-based algorithm revealed that significant degeneration of peripheral nerves could be detected coincidentally with the earliest detectable signs of muscle denervation and preceded physiologically measurable motor function decline. We also found that peripheral degeneration was an early event in FUS as well as C9ORF72 repeat expansion models of ALS, and that serial imaging allowed long-term observation of disease progression and drug effects in living animals. Our study demonstrates that SRS imaging is a sensitive and quantitative means of measuring disease progression, greatly facilitating future studies of disease mechanisms and candidate therapeutics.
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24
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Liao CS, Cheng JX. In Situ and In Vivo Molecular Analysis by Coherent Raman Scattering Microscopy. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2016; 9:69-93. [PMID: 27306307 PMCID: PMC5367927 DOI: 10.1146/annurev-anchem-071015-041627] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Coherent Raman scattering (CRS) microscopy is a high-speed vibrational imaging platform with the ability to visualize the chemical content of a living specimen by using molecular vibrational fingerprints. We review technical advances and biological applications of CRS microscopy. The basic theory of CRS and the state-of-the-art instrumentation of a CRS microscope are presented. We further summarize and compare the algorithms that are used to separate the Raman signal from the nonresonant background, to denoise a CRS image, and to decompose a hyperspectral CRS image into concentration maps of principal components. Important applications of single-frequency and hyperspectral CRS microscopy are highlighted. Potential directions of CRS microscopy are discussed.
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Affiliation(s)
- Chien-Sheng Liao
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907;
| | - Ji-Xin Cheng
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907;
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Abstract
Advancements in coherent Raman scattering (CRS) microscopy have enabled label-free visualization and analysis of functional, endogenous biomolecules in living systems. When compared with spontaneous Raman microscopy, a key advantage of CRS microscopy is the dramatic improvement in imaging speed, which gives rise to real-time vibrational imaging of live biological samples. Using molecular vibrational signatures, recently developed hyperspectral CRS microscopy has improved the readout of chemical information available from CRS images. In this article, we review recent achievements in CRS microscopy, focusing on the theory of the CRS signal-to-noise ratio, imaging speed, technical developments, and applications of CRS imaging in bioscience and clinical settings. In addition, we present possible future directions that the use of this technology may take.
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Affiliation(s)
- Chi Zhang
- Weldon School of Biomedical Engineering and Department of Chemistry, Purdue University, West Lafayette, Indiana 47907;
| | - Delong Zhang
- Weldon School of Biomedical Engineering and Department of Chemistry, Purdue University, West Lafayette, Indiana 47907;
| | - Ji-Xin Cheng
- Weldon School of Biomedical Engineering and Department of Chemistry, Purdue University, West Lafayette, Indiana 47907;
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Wang Y, Ma M, Tang Q, Zhu L, Koleini M, Zou D. The effects of different tensile parameters for the neurodynamic mobilization technique on tricipital muscle wet weight and MuRf-1 expression in rabbits with sciatic nerve injury. J Neuroeng Rehabil 2015; 12:38. [PMID: 25889989 PMCID: PMC4403708 DOI: 10.1186/s12984-015-0034-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 04/10/2015] [Indexed: 11/28/2022] Open
Abstract
Background After peripheral nerve injury, muscles without innervation begin to undergo atrophy. Research has suggested that MuRf-1 may play a role in muscle atrophy. The neurodynamic mobilization technique (NMT) is a manual therapy method used to elongate a nerve along its long axis, resulting in improved blood flow to the nerve. However, the nerve can be damaged if elongated too much. The purpose of this study is to observe the effect of NMT on muscle wet weight and MuRf-1 expression in rabbits with sciatic nerve injury. Methods Six adult rabbits were measured to determine the relationship between the joint angle of the lower limb and percent of sciatic nerve elongation to define the tensile parameters of NMT; Thirty adult rabbits were randomly assigned into a sham, model, NMT-A, NMT-B, or NMT-C groups. Four weeks post-treatment, the wet mass of the tricipital muscles and MuRf-1 expression were observed. Results The wet mass of the tricipital muscles in the NMT-B group was significantly greater than the NMT-A, NMT-C, and model groups. In addition, MuRf-1 expression was significantly reduced in the NMT-B group compared with the NMT-A, NMT-C, and model groups. Conclusions Elongating the nerve by NMT of 9% in rabbits decreased MuRf-1 expression and decelerated muscle atrophy in the subjects with sciatic nerve injury.
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Affiliation(s)
- Yan Wang
- Rehabilitation medicine center of the second affiliated hospital of Heilongjiang university of Chinese medicine, Harbin, 150001, China. .,Rehabilitation medicine college of Heilongjiang university of Chinese medicine, Harbin, 150040, China.
| | - Ming Ma
- Rehabilitation medicine college of Heilongjiang university of Chinese medicine, Harbin, 150040, China.
| | - Qiang Tang
- Rehabilitation medicine center of the second affiliated hospital of Heilongjiang university of Chinese medicine, Harbin, 150001, China. .,Rehabilitation medicine college of Heilongjiang university of Chinese medicine, Harbin, 150040, China.
| | - Luwen Zhu
- Rehabilitation medicine center of the second affiliated hospital of Heilongjiang university of Chinese medicine, Harbin, 150001, China. .,Rehabilitation medicine college of Heilongjiang university of Chinese medicine, Harbin, 150040, China.
| | - Melanie Koleini
- Program in Physical Therapy, Washington University School of Medicine, St. Louis, MO, 63110, USA.
| | - Dequan Zou
- Program in Physical Therapy, Washington University School of Medicine, St. Louis, MO, 63110, USA.
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Lin YC, Kao CH, Chen CC, Ke CJ, Yao CH, Chen YS. Time-course effect of electrical stimulation on nerve regeneration of diabetic rats. PLoS One 2015; 10:e0116711. [PMID: 25689049 PMCID: PMC4331087 DOI: 10.1371/journal.pone.0116711] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Accepted: 12/13/2014] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Electrical stimulation (ES) has been shown to promote nerve regeneration in rats with experimental diabetes induced using streptozotocin (STZ). However, the time-course effect of ES on nerve regeneration of diabetic animals has not been reported in previous studies. The present study attempted to examine the effect of different timing of ES after peripheral nerve transection in diabetic rats. METHODOLOGY/FINDINGS Fifty Sprague-Dawley rats were used in the study. They were classified into five groups. STZ-induced diabetes was created in groups A to D. Normal animals in group E were used as the non-diabetic controls. The sciatic nerve was transected and repaired using a silicone rubber conduit across a 10-mm gap in all groups. Groups A to C received ES for 15 minutes every other day for 2 weeks. Stimulation was initiated on day 1 following the nerve repair for group A, day 8 for group B, and day 15 for group C. The diabetic control group D and the normal control group E received no ES. At 30 days after surgery in group A, histological evaluations showed a higher success percentage of regeneration across the 10-mm nerve gap, and the electrophysiological results showed significantly larger mean values of evoked muscle action potential area and amplitude of the reinnervated gastrocnemius muscle compared with group D. CONCLUSIONS/SIGNIFICANCE It is concluded that an immediate onset of ES may improve the functional recovery of large nerve defect in diabetic animals.
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Affiliation(s)
- Yu-Ching Lin
- Lab of Biomaterials, School of Chinese Medicine, China Medical University, Taichung, Taiwan
| | - Chia-Hong Kao
- Lab of Biomaterials, School of Chinese Medicine, China Medical University, Taichung, Taiwan
- Department of Chinese Medicine, Taipei Medical University Hospital, Taipei, Taiwan
| | - Chung-Chia Chen
- Lab of Biomaterials, School of Chinese Medicine, China Medical University, Taichung, Taiwan
- Linsen (Chinese Medicine) Branch, Taipei City Hospital, Taipei, Taiwan
| | - Cherng-Jyh Ke
- Department of Orthopedics, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Chun-Hsu Yao
- Lab of Biomaterials, School of Chinese Medicine, China Medical University, Taichung, Taiwan
| | - Yueh-Sheng Chen
- Lab of Biomaterials, School of Chinese Medicine, China Medical University, Taichung, Taiwan
- Department of Biomedical Informatics, Asia University, Wufeng District, Taichung, Taiwan
- Research Center for Chinese Medicine & Acupuncture, China Medical University, Taichung, Taiwan
- * E-mail:
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Aoyagi Y, Kawakami R, Osanai H, Hibi T, Nemoto T. A rapid optical clearing protocol using 2,2'-thiodiethanol for microscopic observation of fixed mouse brain. PLoS One 2015; 10:e0116280. [PMID: 25633541 PMCID: PMC4310605 DOI: 10.1371/journal.pone.0116280] [Citation(s) in RCA: 112] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2014] [Accepted: 12/06/2014] [Indexed: 12/16/2022] Open
Abstract
Elucidation of neural circuit functions requires visualization of the fine structure of neurons in the inner regions of thick brain specimens. However, the tissue penetration depth of laser scanning microscopy is limited by light scattering and/or absorption by the tissue. Recently, several optical clearing reagents have been proposed for visualization in fixed specimens. However, they require complicated protocols or long treatment times. Here we report the effects of 2,2'-thiodiethanol (TDE) solutions as an optical clearing reagent for fixed mouse brains expressing a yellow fluorescent protein. Immersion of fixed brains in TDE solutions rapidly (within 30 min in the case of 400-µm-thick fixed brain slices) increased their transparency and enhanced the penetration depth in both confocal and two-photon microscopy. In addition, we succeeded in visualizing dendritic spines along single dendrites at deep positions in fixed thick brain slices. These results suggest that our proposed protocol using TDE solution is a rapid and useful method for optical clearing of fixed specimens expressing fluorescent proteins.
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Affiliation(s)
- Yuka Aoyagi
- Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido, Japan
- Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Ryosuke Kawakami
- Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido, Japan
- Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Hokkaido, Japan
- Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), Kawaguchi, Saitama, Japan
| | - Hisayuki Osanai
- Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido, Japan
- Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Terumasa Hibi
- Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido, Japan
- Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Hokkaido, Japan
- Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), Kawaguchi, Saitama, Japan
| | - Tomomi Nemoto
- Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido, Japan
- Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Hokkaido, Japan
- Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), Kawaguchi, Saitama, Japan
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Calve S, Ready A, Huppenbauer C, Main R, Neu CP. Optical clearing in dense connective tissues to visualize cellular connectivity in situ. PLoS One 2015; 10:e0116662. [PMID: 25581165 PMCID: PMC4291226 DOI: 10.1371/journal.pone.0116662] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Accepted: 12/11/2014] [Indexed: 01/06/2023] Open
Abstract
Visualizing the three-dimensional morphology and spatial patterning of cells embedded deep within dense connective tissues of the musculoskeletal system has been possible only by utilizing destructive techniques. Here we utilize fructose-based clearing solutions to image cell connectivity and deep tissue-scale patterning in situ by standard confocal microscopy. Optical clearing takes advantage of refractive index matching of tissue and the embedding medium to visualize light transmission through a broad range of bovine and whole mount murine tissues, including cartilage, bone, and ligament, of the head and hindlimb. Using non-destructive methods, we show for the first time intercellular chondrocyte connections throughout the bulk of cartilage, and we reveal in situ patterns of osteocyte processes and the lacunar-canalicular system deep within mineralized cortical bone. Optical clearing of connective tissues is expected to find broad application for the study of cell responses in normal physiology and disease pathology.
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Affiliation(s)
- Sarah Calve
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana, United States of America
- * E-mail: (SC); (CPN)
| | - Andrew Ready
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana, United States of America
| | | | - Russell Main
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana, United States of America
- Department of Basic Medical Sciences, Purdue University, West Lafayette, Indiana, United States of America
| | - Corey P. Neu
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana, United States of America
- * E-mail: (SC); (CPN)
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Yang B, Treweek JB, Kulkarni RP, Deverman BE, Chen CK, Lubeck E, Shah S, Cai L, Gradinaru V. Single-cell phenotyping within transparent intact tissue through whole-body clearing. Cell 2014; 158:945-958. [PMID: 25088144 PMCID: PMC4153367 DOI: 10.1016/j.cell.2014.07.017] [Citation(s) in RCA: 656] [Impact Index Per Article: 65.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Revised: 07/13/2014] [Accepted: 07/15/2014] [Indexed: 01/08/2023]
Abstract
Understanding the structure-function relationships at cellular, circuit, and organ-wide scale requires 3D anatomical and phenotypical maps, currently unavailable for many organs across species. At the root of this knowledge gap is the absence of a method that enables whole-organ imaging. Herein, we present techniques for tissue clearing in which whole organs and bodies are rendered macromolecule-permeable and optically transparent, thereby exposing their cellular structure with intact connectivity. We describe PACT (passive clarity technique), a protocol for passive tissue clearing and immunostaining of intact organs; RIMS (refractive index matching solution), a mounting media for imaging thick tissue; and PARS (perfusion-assisted agent release in situ), a method for whole-body clearing and immunolabeling. We show that in rodents PACT, RIMS, and PARS are compatible with endogenous-fluorescence, immunohistochemistry, RNA single-molecule FISH, long-term storage, and microscopy with cellular and subcellular resolution. These methods are applicable for high-resolution, high-content mapping and phenotyping of normal and pathological elements within intact organs and bodies.
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Affiliation(s)
- Bin Yang
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Jennifer B Treweek
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Rajan P Kulkarni
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA; Division of Dermatology, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Benjamin E Deverman
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Chun-Kan Chen
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Eric Lubeck
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Sheel Shah
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Long Cai
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Viviana Gradinaru
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
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Longitudinal, 3D in vivo imaging of sebaceous glands by coherent anti-stokes Raman scattering microscopy: normal function and response to cryotherapy. J Invest Dermatol 2014; 135:39-44. [PMID: 25026458 PMCID: PMC4268001 DOI: 10.1038/jid.2014.293] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Revised: 04/10/2014] [Accepted: 05/01/2014] [Indexed: 12/21/2022]
Abstract
Sebaceous glands perform complex functions, and are centrally involved in the pathogenesis of acne vulgaris. Current techniques for studying sebaceous glands are mostly static in nature, whereas the gland’s main function – excretion of sebum via the holocrine mechanism – can only be evaluated over time. We present a longitudinal, real-time alternative – the in vivo, label-free imaging of sebaceous glands using Coherent Anti-Stokes Raman Scattering (CARS) microscopy, which is used to selectively visualize lipids. In mouse ears, CARS microscopy revealed dynamic changes in sebaceous glands during the holocrine secretion process, as well as in response to damage to the glands caused by cooling. Detailed gland structure, plus the active migration of individual sebocytes and cohorts of sebocytes were measured. Cooling produced characteristic changes in sebocyte structure and migration. This study demonstrates that CARS microscopy is a promising tool for studying the sebaceous gland and its associated disorders in three-dimensions in vivo.
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