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Kawauchi S, Kono A, Muramatsu Y, Hennes G, Seki S, Tominaga S, Haruyama Y, Komuta Y, Nishidate I, Matsukuma S, Wang Y, Sato S. Meningeal Damage and Interface Astroglial Scarring in the Rat Brain Exposed to a Laser-Induced Shock Wave(s). J Neurotrauma 2024; 41:e2039-e2053. [PMID: 38534205 DOI: 10.1089/neu.2023.0572] [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: 03/28/2024] Open
Abstract
In the past decade, signature clinical neuropathology of blast-induced traumatic brain injury has been under intense debate, but interface astroglial scarring (IAS) seems to be convincing. In this study, we examined whether IAS could be replicated in the rat brain exposed to a laser-induced shock wave(s) (LISW[s]), a tool that can produce a pure shock wave (primary mechanism) without dynamic pressure (tertiary mechanism). Under certain conditions, we observed astroglial scarring in the subpial glial plate (SGP), gray-white matter junctions (GM-WM), ventricular wall (VW), and regions surrounding cortical blood vessels, accurately reproducing clinical IAS. We also observed shock wave impulse-dependent meningeal damage (dural microhemorrhage) in vivo by transcranial near-infrared (NIR) reflectance imaging. Importantly, there were significant correlations between the degree of dural microhemorrhage and the extent of astroglial scarring more than 7 days post-exposure, suggesting an association of meningeal damage with astroglial scarring. The results demonstrated that the primary mechanism alone caused the IAS and meningeal damage, both of which are attributable to acoustic impedance mismatching at multi-layered tissue boundaries. The time course of glial fibrillary acidic protein (GFAP) immunoreactivity depended not only on the LISW conditions but also on the regions. In the SGP, significant increases in GFAP immunoreactivity were observed at 3 days post-exposure, whereas in the GM-WM and VW, GFAP immunoreactivity was not significantly increased before 28 days post-exposure, suggesting different pathological mechanisms. With the high-impulse single exposure or the multiple exposure (low impulse), fibrotic reaction or fibrotic scar formation was observed, in addition to astroglial scarring, in the cortical surface region. Although there are some limitations, this seems to be the first report on the shock-wave-induced IAS rodent model. The model may be useful to explore potential therapeutic approaches for IAS.
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Affiliation(s)
- Satoko Kawauchi
- Division of Bioinformation and Therapeutic Systems, National Defense Medical College Research Institute, Tokorozawa, Saitama, Japan
| | - Akemi Kono
- Division of Bioinformation and Therapeutic Systems, National Defense Medical College Research Institute, Tokorozawa, Saitama, Japan
| | - Yuriko Muramatsu
- Division of Bioinformation and Therapeutic Systems, National Defense Medical College Research Institute, Tokorozawa, Saitama, Japan
| | - Grant Hennes
- Defence Research and Development Canada, Suffield Research Centre, Medicine Hat, Alberta, Canada
| | - Shuta Seki
- Pharmacy Selection, Medical Material Department, Japan Self Defense Force Central Hospital, Setagaya, Tokyo, Japan
| | - Susumu Tominaga
- Department of Pathology and Laboratory Medicine, National Defense Medical College, Tokorozawa, Saitama, Japan
| | - Yasue Haruyama
- Division of Bioinformation and Therapeutic Systems, National Defense Medical College Research Institute, Tokorozawa, Saitama, Japan
| | - Yukari Komuta
- Division of Bioinformation and Therapeutic Systems, National Defense Medical College Research Institute, Tokorozawa, Saitama, Japan
| | - Izumi Nishidate
- Division of Bioinformation and Therapeutic Systems, National Defense Medical College Research Institute, Tokorozawa, Saitama, Japan
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, Japan
| | - Susumu Matsukuma
- Department of Pathology and Laboratory Medicine, National Defense Medical College, Tokorozawa, Saitama, Japan
| | - Yushan Wang
- Defence Research and Development Canada, Suffield Research Centre, Medicine Hat, Alberta, Canada
| | - Shunichi Sato
- Division of Bioinformation and Therapeutic Systems, National Defense Medical College Research Institute, Tokorozawa, Saitama, Japan
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Kempuraj D, Mohan RR. Blast injury: Impact to the cornea. Exp Eye Res 2024; 244:109915. [PMID: 38677709 PMCID: PMC11179966 DOI: 10.1016/j.exer.2024.109915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 04/03/2024] [Accepted: 04/24/2024] [Indexed: 04/29/2024]
Abstract
Visual disorders are common even after mild traumatic brain injury (mTBI) or blast exposure. The cost of blast-induced vision loss in civilians, military personnel, and veterans is significant. The visual consequences of blasts associated with TBI are elusive. Active military personnel and veterans report various ocular pathologies including corneal disorders post-combat blasts. The wars and conflicts in Afghanistan, Iraq, Syria, and Ukraine have significantly increased the number of corneal and other ocular disorders among military personnel and veterans. Binocular vision, visual fields, and other visual functions could be impaired following blast-mediated TBI. Blast-associated injuries can cause visual disturbances, binocular system problems, and visual loss. About 25% of veterans exposed to blasts report corneal injury. Blast exposure induces corneal edema, corneal opacity, increased corneal thickness, damage of corneal epithelium, corneal abrasions, and stromal and endothelial abnormality including altered endothelial density, immune cell infiltration, corneal neovascularization, Descemet membrane rupture, and increased pain mediators in animal models and the blast-exposed military personnel including veterans. Immune response exacerbates blast-induced ocular injury. TBI is associated with dry eyes and pain in veterans. Subjects exposed to blasts that cause TBI should undergo immediate clinical visual and ocular examinations. Delayed visual care may lead to progressive vision loss, lengthening/impairing rehabilitation and ultimately may lead to permanent vision problems and blindness. Open-field blast exposure could induce corneal injuries and immune responses in the cornea. Further studies are warranted to understand corneal pathology after blast exposure. A review of current advancements in blast-induced corneal injury will help elucidate novel targets for potential therapeutic options. This review discusses the impact of blast exposure-associated corneal disorders.
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Affiliation(s)
- Duraisamy Kempuraj
- Harry S. Truman Memorial Veterans' Hospital, Columbia, MO, United States; One-Health Vision Research Program, Departments of Veterinary Medicine & Surgery and Biomedical Sciences, College of Veterinary Medicine, University of Missouri, Columbia, MO, United States
| | - Rajiv R Mohan
- Harry S. Truman Memorial Veterans' Hospital, Columbia, MO, United States; One-Health Vision Research Program, Departments of Veterinary Medicine & Surgery and Biomedical Sciences, College of Veterinary Medicine, University of Missouri, Columbia, MO, United States; Mason Eye Institute, School of Medicine, University of Missouri, Columbia, MO, United States.
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3
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Bohnert S, Reinert C, Trella S, Cattaneo A, Preiß U, Bohnert M, Zwirner J, Büttner A, Schmitz W, Ondruschka B. Neuroforensomics: metabolites as valuable biomarkers in cerebrospinal fluid of lethal traumatic brain injuries. Sci Rep 2024; 14:13651. [PMID: 38871842 DOI: 10.1038/s41598-024-64312-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 06/07/2024] [Indexed: 06/15/2024] Open
Abstract
Traumatic brain injury (TBI) is a ubiquitous, common sequela of accidents with an annual prevalence of several million cases worldwide. In forensic pathology, structural proteins of the cellular compartments of the CNS in serum and cerebrospinal fluid (CSF) have been predominantly used so far as markers of an acute trauma reaction for the biochemical assessment of neuropathological changes after TBI. The analysis of endogenous metabolites offers an innovative approach that has not yet been considered widely in the assessment of causes and circumstances of death, for example after TBI. The present study, therefore, addresses the question whether the detection of metabolites by liquid-chromatography-mass spectrometry (LC/MS) analysis in post mortem CSF is suitable to identify TBI and to distinguish it from acute cardiovascular control fatalities (CVF). Metabolite analysis of 60 CSF samples collected during autopsies was performed using high resolution (HR)-LC/MS. Subsequent statistical and graphical evaluation as well as the calculation of a TBI/CVF quotient yielded promising results: numerous metabolites were identified that showed significant concentration differences in the post mortem CSF for lethal acute TBI (survival times up to 90 min) compared to CVF. For the first time, this forensic study provides an evaluation of a new generation of biomarkers for diagnosing TBI in the differentiation to other causes of death, here CVF, as surrogate markers for the post mortem assessment of complex neuropathological processes in the CNS ("neuroforensomics").
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Affiliation(s)
- Simone Bohnert
- Institute of Forensic Medicine, University of Würzburg, Würzburg, Germany
| | - Christoph Reinert
- Institute of Forensic Medicine, University of Würzburg, Würzburg, Germany
| | - Stefanie Trella
- Institute of Forensic Medicine, University of Würzburg, Würzburg, Germany
| | - Andrea Cattaneo
- Department of Neurosurgery, University Hospital of Würzburg, Würzburg, Germany
| | - Ulrich Preiß
- Institute of Forensic Medicine, University of Würzburg, Würzburg, Germany
| | - Michael Bohnert
- Institute of Forensic Medicine, University of Würzburg, Würzburg, Germany
| | - Johann Zwirner
- Institute of Legal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Department of Oral Sciences, University of Otago, Dunedin, New Zealand
| | - Andreas Büttner
- Institute of Forensic Medicine, Rostock University Medical Center, Rostock, Germany
| | - Werner Schmitz
- Institute of Biochemistry and Molecular Biology, Biozentrum, University of Würzburg, Würzburg, Germany
| | - Benjamin Ondruschka
- Institute of Legal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
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Gilmore N, Tseng CEJ, Maffei C, Tromly SL, Deary KB, McKinney IR, Kelemen JN, Healy BC, Hu CG, Ramos-Llordén G, Masood M, Cali RJ, Guo J, Belanger HG, Yao EF, Baxter T, Fischl B, Foulkes AS, Polimeni JR, Rosen BR, Perl DP, Hooker JM, Zürcher NR, Huang SY, Kimberly WT, Greve DN, Mac Donald CL, Dams-O’Connor K, Bodien YG, Edlow BL. Impact of repeated blast exposure on active-duty United States Special Operations Forces. Proc Natl Acad Sci U S A 2024; 121:e2313568121. [PMID: 38648470 PMCID: PMC11087753 DOI: 10.1073/pnas.2313568121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 03/22/2024] [Indexed: 04/25/2024] Open
Abstract
United States (US) Special Operations Forces (SOF) are frequently exposed to explosive blasts in training and combat, but the effects of repeated blast exposure (RBE) on SOF brain health are incompletely understood. Furthermore, there is no diagnostic test to detect brain injury from RBE. As a result, SOF personnel may experience cognitive, physical, and psychological symptoms for which the cause is never identified, and they may return to training or combat during a period of brain vulnerability. In 30 active-duty US SOF, we assessed the relationship between cumulative blast exposure and cognitive performance, psychological health, physical symptoms, blood proteomics, and neuroimaging measures (Connectome structural and diffusion MRI, 7 Tesla functional MRI, [11C]PBR28 translocator protein [TSPO] positron emission tomography [PET]-MRI, and [18F]MK6240 tau PET-MRI), adjusting for age, combat exposure, and blunt head trauma. Higher blast exposure was associated with increased cortical thickness in the left rostral anterior cingulate cortex (rACC), a finding that remained significant after multiple comparison correction. In uncorrected analyses, higher blast exposure was associated with worse health-related quality of life, decreased functional connectivity in the executive control network, decreased TSPO signal in the right rACC, and increased cortical thickness in the right rACC, right insula, and right medial orbitofrontal cortex-nodes of the executive control, salience, and default mode networks. These observations suggest that the rACC may be susceptible to blast overpressure and that a multimodal, network-based diagnostic approach has the potential to detect brain injury associated with RBE in active-duty SOF.
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Affiliation(s)
- Natalie Gilmore
- Center for Neurotechnology and Neurorecovery, Massachusetts General Hospital, Boston, MA02114
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA02114
| | - Chieh-En J. Tseng
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA02129
| | - Chiara Maffei
- Center for Neurotechnology and Neurorecovery, Massachusetts General Hospital, Boston, MA02114
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA02114
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA02129
| | - Samantha L. Tromly
- Institute of Applied Engineering, University of South Florida, Tampa, FL33612
| | | | - Isabella R. McKinney
- Center for Neurotechnology and Neurorecovery, Massachusetts General Hospital, Boston, MA02114
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA02114
| | - Jessica N. Kelemen
- Center for Neurotechnology and Neurorecovery, Massachusetts General Hospital, Boston, MA02114
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA02114
| | - Brian C. Healy
- Harvard T.H. Chan School of Public Health, Boston, MA02115
| | - Collin G. Hu
- United States Army Special Operations Aviation Command, Fort Liberty, NC28307
- Department of Family Medicine, F. Edward Hebert School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD20814
| | - Gabriel Ramos-Llordén
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA02129
| | - Maryam Masood
- Center for Neurotechnology and Neurorecovery, Massachusetts General Hospital, Boston, MA02114
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA02114
| | - Ryan J. Cali
- Center for Neurotechnology and Neurorecovery, Massachusetts General Hospital, Boston, MA02114
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA02114
| | - Jennifer Guo
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA02114
| | - Heather G. Belanger
- Department of Psychiatry and Behavioral Neurosciences, University of South Florida, Tampa, FL33613
| | - Eveline F. Yao
- Office of the Air Force Surgeon General, Falls Church, VA22042
| | - Timothy Baxter
- Institute of Applied Engineering, University of South Florida, Tampa, FL33612
| | - Bruce Fischl
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA02129
| | | | - Jonathan R. Polimeni
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA02129
| | - Bruce R. Rosen
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA02129
| | - Daniel P. Perl
- Department of Pathology, F. Edward Hébert School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD20814
| | - Jacob M. Hooker
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA02129
| | - Nicole R. Zürcher
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA02129
| | - Susie Y. Huang
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA02129
| | - W. Taylor Kimberly
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA02114
| | - Douglas N. Greve
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA02129
| | | | - Kristen Dams-O’Connor
- Department of Rehabilitation and Human Performance, Icahn School of Medicine at Mount Sinai, New York, NY10029
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY10029
| | - Yelena G. Bodien
- Center for Neurotechnology and Neurorecovery, Massachusetts General Hospital, Boston, MA02114
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA02114
- Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital and Harvard Medical School, Charlestown, MA02129
| | - Brian L. Edlow
- Center for Neurotechnology and Neurorecovery, Massachusetts General Hospital, Boston, MA02114
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA02114
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA02129
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Sachdeva T, Ganpule SG. Twenty Years of Blast-Induced Neurotrauma: Current State of Knowledge. Neurotrauma Rep 2024; 5:243-253. [PMID: 38515548 PMCID: PMC10956535 DOI: 10.1089/neur.2024.0001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2024] Open
Abstract
Blast-induced neurotrauma (BINT) is an important injury paradigm of neurotrauma research. This short communication summarizes the current knowledge of BINT. We divide the BINT research into several broad categories-blast wave generation in laboratory, biomechanics, pathology, behavioral outcomes, repetitive blast in animal models, and clinical and neuroimaging investigations in humans. Publications from 2000 to 2023 in each subdomain were considered. The analysis of the literature has brought out salient aspects. Primary blast waves can be simulated reasonably in a laboratory using carefully designed shock tubes. Various biomechanics-based theories of BINT have been proposed; each of these theories may contribute to BINT by generating a unique biomechanical signature. The injury thresholds for BINT are in the nascent stages. Thresholds for rodents are reasonably established, but such thresholds (guided by primary blast data) are unavailable in humans. Single blast exposure animal studies suggest dose-dependent neuronal pathologies predominantly initiated by blood-brain barrier permeability and oxidative stress. The pathologies were typically reversible, with dose-dependent recovery times. Behavioral changes in animals include anxiety, auditory and recognition memory deficits, and fear conditioning. The repetitive blast exposure manifests similar pathologies in animals, however, at lower blast overpressures. White matter irregularities and cortical volume and thickness alterations have been observed in neuroimaging investigations of military personnel exposed to blast. Behavioral changes in human cohorts include sleep disorders, poor motor skills, cognitive dysfunction, depression, and anxiety. Overall, this article provides a concise synopsis of current understanding, consensus, controversies, and potential future directions.
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Affiliation(s)
- Tarun Sachdeva
- Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, India
| | - Shailesh G. Ganpule
- Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, India
- Department of Design, Indian Institute of Technology Roorkee, Roorkee, India
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6
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Yu J, Guo H, Qiao X, Jiang L, Chen Y, Liu J, Zhang C, Su X, Zhang H, Wan M. Transcranial ultrasound estimation of viscoelasticity and fluidity in brain tumors aided by transcranial shear waves. ULTRASONICS 2024; 138:107262. [PMID: 38330769 DOI: 10.1016/j.ultras.2024.107262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 01/06/2024] [Accepted: 02/05/2024] [Indexed: 02/10/2024]
Abstract
Cerebral diseases, such as brain tumors, are intricately linked to the mechanical properties of brain tissues. Estimating the mechanical properties of brain tumors using transcranial ultrasound is a promising approach. However, the complexity of cranial features introduces challenges, such as ultrasound attenuation and interference from multidirectional transcranial shear waves induced by impact vibrations. To address these issues, this study proposes a transcranial ultrasound estimation method assisted by transcranial shear vibrations. Transcranial vibrations apply shear forces on the parietal bone, inducing unidirectional transcranial shear waves within brain tissue, as validated through simulations. Shear waves at different frequencies were captured via transcranial ultrasound, which were used to assess the viscoelasticity and fluidity of brain tumors. Transcranial experimental validations were conducted in 3D-printed models with tumor phantoms and ex vivo animal tumors. Vibration safety assessments were also performed. The results demonstrate that transcranial ultrasound can detect micron displacements induced by transcranial shear waves. In phantom and ex vivo animal experiments, speed distribution maps were employed to determine the size and location of one or two tumors enclosed in the skull model. The results revealed that the proposed approach could detect tumors with a minimum diameter of 0.8 cm and an inter-tumor distance of 0.8 cm. Notably, significant differences in viscoelasticity and fluidity between normal brain tissue and brain tumors were found (p<0.001). The maximum assessment errors for the elasticity, viscosity, and fluidity using transcranial ultrasound were 11.90%, 4.82%, and 0.73%, respectively, indicating that fluidity was more robust than viscoelasticity. The maximum accelerations of the skull were only 3.21 ms-2.
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Affiliation(s)
- Jianjun Yu
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China
| | - Hao Guo
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China
| | - Xiaoyang Qiao
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China
| | - Liyuan Jiang
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China
| | - Yiran Chen
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China
| | - Jiacheng Liu
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China
| | - Chaoyang Zhang
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China
| | - Xiao Su
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China
| | - Hongmei Zhang
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China.
| | - Mingxi Wan
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Department of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, PR China.
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7
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Galindo EJ, Flores RR, Mejia-Alvarez R, Willis AM, Tartis MS. Simultaneous High-Frame-Rate Acoustic Plane-Wave and Optical Imaging of Intracranial Cavitation in Polyacrylamide Brain Phantoms during Blunt Force Impact. Bioengineering (Basel) 2024; 11:132. [PMID: 38391618 DOI: 10.3390/bioengineering11020132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/20/2024] [Accepted: 01/25/2024] [Indexed: 02/24/2024] Open
Abstract
Blunt and blast impacts occur in civilian and military personnel, resulting in traumatic brain injuries necessitating a complete understanding of damage mechanisms and protective equipment design. However, the inability to monitor in vivo brain deformation and potential harmful cavitation events during collisions limits the investigation of injury mechanisms. To study the cavitation potential, we developed a full-scale human head phantom with features that allow a direct optical and acoustic observation at high frame rates during blunt impacts. The phantom consists of a transparent polyacrylamide material sealed with fluid in a 3D-printed skull where windows are integrated for data acquisition. The model has similar mechanical properties to brain tissue and includes simplified yet key anatomical features. Optical imaging indicated reproducible cavitation events above a threshold impact energy and localized cavitation to the fluid of the central sulcus, which appeared as high-intensity regions in acoustic images. An acoustic spectral analysis detected cavitation as harmonic and broadband signals that were mapped onto a reconstructed acoustic frame. Small bubbles trapped during phantom fabrication resulted in cavitation artifacts, which remain the largest challenge of the study. Ultimately, acoustic imaging demonstrated the potential to be a stand-alone tool, allowing observations at depth, where optical techniques are limited.
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Affiliation(s)
- Eric J Galindo
- Department of Chemical Engineering, New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA
| | - Riley R Flores
- Department of Chemical Engineering, New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA
| | - Ricardo Mejia-Alvarez
- Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824, USA
| | - Adam M Willis
- Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824, USA
- 59th Medical Wing, Office of the Chief Scientist, Lackland AFB, San Antonio, TX 78236, USA
| | - Michaelann S Tartis
- Department of Chemical Engineering, New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA
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Zhang L, Yang Q, Yuan R, Li M, Lv M, Zhang L, Xie X, Liang W, Chen X. Single-nucleus transcriptomic mapping of blast-induced traumatic brain injury in mice hippocampus. Sci Data 2023; 10:638. [PMID: 37730716 PMCID: PMC10511629 DOI: 10.1038/s41597-023-02552-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 09/07/2023] [Indexed: 09/22/2023] Open
Abstract
As a significant type of traumatic brain injury (TBI), blast-induced traumatic brain injury (bTBI) frequently results in severe neurological and psychological impairments. Due to its unique mechanistic and clinical features, bTBI presents diagnostic and therapeutic challenges compared to other TBI forms. The hippocampus, an important site for secondary injury of bTBI, serves as a key niche for neural regeneration and repair post-injury, and is closely associated with the neurological outcomes of bTBI patients. Nonetheless, the pathophysiological alterations of hippocampus underpinning bTBI remain enigmatic, and a corresponding transcriptomic dataset for research reference is yet to be established. In this investigation, the single-nucleus RNA sequencing (snRNA-seq) technique was employed to sequence individual hippocampal nuclei of mice from bTBI and sham group. Upon stringent quality control, gene expression data from 17,278 nuclei were obtained, with the dataset's reliability substantiated through various analytical methods. This dataset holds considerable potential for exploring secondary hippocampal injury and neurogenesis mechanisms following bTBI, with important reference value for the identification of specific diagnostic and therapeutic targets for bTBI.
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Affiliation(s)
- Lingxuan Zhang
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, 610041, China
| | - Qiuyun Yang
- Department of Forensic Genetics, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, 610041, China
- West China Second University Hospital, Sichuan University, Chengdu, 610041, China
| | - Ruixuan Yuan
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, 610041, China
| | - Manrui Li
- Department of Forensic Genetics, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, 610041, China
| | - Meili Lv
- Department of Immunology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, 610041, China
| | - Lin Zhang
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, 610041, China
| | - Xiaoqi Xie
- Department of Critical Care Medicine, Sichuan University, Chengdu, 610041, China.
| | - Weibo Liang
- Department of Forensic Genetics, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, 610041, China.
| | - Xiameng Chen
- Department of Forensic Pathology and Forensic Clinical Medicine, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, 610041, China.
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9
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Kawauchi S, Inaba M, Muramatsu Y, Kono A, Nishidate I, Adachi T, Cernak I, Sato S. In vivo imaging of nitric oxide in the male rat brain exposed to a shock wave. J Neurosci Res 2023; 101:976-989. [PMID: 36747471 DOI: 10.1002/jnr.25172] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 01/15/2023] [Accepted: 01/20/2023] [Indexed: 02/08/2023]
Abstract
While numerous studies have suggested the involvement of cerebrovascular dysfunction in the pathobiology of blast-induced traumatic brain injury (bTBI), its exact mechanisms and how they affect the outcome of bTBI are not fully understood. Our previous study showed the occurrence of cortical spreading depolarization (CSD) and subsequent long-lasting oligemia/hypoxemia in the rat brain exposed to a laser-induced shock wave (LISW). We hypothesized that this hemodynamic abnormality is associated with shock wave-induced generation of nitric oxide (NO). In this study, to verify this hypothesis, we used an NO-sensitive fluorescence probe, diaminofluorescein-2 diacetate (DAF-2 DA), for real-time in vivo imaging of male Sprague-Dawley rats' brain exposed to a mild-impulse LISW. We observed the most intense fluorescence, indicative of NO production, along the pial arteriolar walls during the period of 10-30 min post-exposure, parallel with CSD occurrence. This post-exposure period also coincided with the early phase of hemodynamic abnormalities. While the changes in arteriolar wall fluorescence measured in rats receiving pharmacological NO synthase inhibition by nitro-L-arginine methyl ester (L-NAME) 24 h before exposure showed a temporal profile similar to that of changes observed in LISW-exposed rats with CSD, their intensity level was considerably lower; this suggests partial involvement of NOS in shock wave-induced NO production. To the best of our knowledge, this is the first real-time in vivo imaging of NO in rat brain, confirming the involvement of NO in shock-wave-induced hemodynamic impairments. Finally, we have outlined the limitations of this study and our future research directions.
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Affiliation(s)
- Satoko Kawauchi
- Division of Bioinformation and Therapeutic Systems, National Defense Medical College Research Institute, Tokorozawa, Japan
| | - Masaki Inaba
- Graduate School of Bio-Applications & Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan
| | - Yuriko Muramatsu
- Division of Bioinformation and Therapeutic Systems, National Defense Medical College Research Institute, Tokorozawa, Japan
| | - Akemi Kono
- Division of Bioinformation and Therapeutic Systems, National Defense Medical College Research Institute, Tokorozawa, Japan
| | - Izumi Nishidate
- Division of Bioinformation and Therapeutic Systems, National Defense Medical College Research Institute, Tokorozawa, Japan.,Graduate School of Bio-Applications & Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan
| | - Takeshi Adachi
- Division of Cardiology, Department of Internal Medicine, National Defense Medical College, Tokorozawa, Japan
| | - Ibolja Cernak
- Division of Bioinformation and Therapeutic Systems, National Defense Medical College Research Institute, Tokorozawa, Japan.,Department of Biomedical Sciences, Mercer School of Medicine, Mercer University, Columbus, Georgia, USA
| | - Shunichi Sato
- Division of Bioinformation and Therapeutic Systems, National Defense Medical College Research Institute, Tokorozawa, Japan
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10
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Muresanu DF, Sharma A, Tian ZR, Lafuente JV, Nozari A, Feng L, Buzoianu AD, Wiklund L, Sharma HS. Nanowired Delivery of Cerebrolysin with Mesenchymal Stem Cells Attenuates Heat Stress-Induced Exacerbation of Neuropathology Following Brain Blast Injury. ADVANCES IN NEUROBIOLOGY 2023; 32:231-270. [PMID: 37480463 DOI: 10.1007/978-3-031-32997-5_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/24/2023]
Abstract
Blast brain injury (bBI) following explosive detonations in warfare is one of the prominent causes of multidimensional insults to the central nervous and other vital organs injury. Several military personnel suffered from bBI during the Middle East conflict at hot environment. The bBI largely occurs due to pressure waves, generation of heat together with release of shrapnel and gun powders explosion with penetrating and/or impact head trauma causing multiple brain damage. As a result, bBI-induced secondary injury causes breakdown of the blood-brain barrier (BBB) and edema formation that further results in neuronal, glial and axonal injuries. Previously, we reported endocrine imbalance and influence of diabetes on bBI-induced brain pathology that was significantly attenuated by nanowired delivery of cerebrolysin in model experiments. Cerebrolysin is a balanced composition of several neurotrophic factors, and active peptide fragment is capable of neuroprotection in several neurological insults. Exposure to heat stress alone causes BBB damage, edema formation and brain pathology. Thus, it is quite likely that hot environment further exacerbates the consequences of bBI. Thus, novel therapeutic strategies using nanodelivery of stem cell and cerebrolysin may further enhance superior neuroprotection in bBI at hot environment. Our observations are the first to show that combined nanowired delivery of mesenchymal stem cells (MSCs) and cerebrolysin significantly attenuated exacerbation of bBI in hot environment and induced superior neuroprotection, not reported earlier. The possible mechanisms of neuroprotection with MSCs and cerebrolysin in bBI are discussed in the light of current literature.
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Affiliation(s)
- Dafin F Muresanu
- Department of Clinical Neurosciences, University of Medicine & Pharmacy, Cluj-Napoca, Romania
- "RoNeuro" Institute for Neurological Research and Diagnostic, Cluj-Napoca, Romania
| | - Aruna Sharma
- International Experimental Central Nervous System Injury & Repair (IECNSIR), Department of Surgical Sciences, Anesthesiology & Intensive Care Medicine, Uppsala University Hospital, Uppsala University, Uppsala, Sweden
| | - Z Ryan Tian
- Department of Chemistry & Biochemistry, University of Arkansas, Fayetteville, AR, USA
| | - José Vicente Lafuente
- LaNCE, Department of Neuroscience, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain
| | - Ala Nozari
- Anesthesiology & Intensive Care, Chobanian & Avedisian School of Medicine, Boston University, Boston, MA, USA
| | - Lianyuan Feng
- Department of Neurology, Bethune International Peace Hospital, Zhongshan, Hebei Province, China
| | - Anca D Buzoianu
- Department of Clinical Pharmacology and Toxicology, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Lars Wiklund
- International Experimental Central Nervous System Injury & Repair (IECNSIR), Department of Surgical Sciences, Anesthesiology & Intensive Care Medicine, Uppsala University Hospital, Uppsala University, Uppsala, Sweden
| | - Hari Shanker Sharma
- International Experimental Central Nervous System Injury & Repair (IECNSIR), Department of Surgical Sciences, Anesthesiology & Intensive Care Medicine, Uppsala University Hospital, Uppsala University, Uppsala, Sweden.
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11
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Blast-related traumatic brain injury is mediated by the kynurenine pathway. Neuroreport 2022; 33:569-576. [DOI: 10.1097/wnr.0000000000001817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Gu L, Zhou M, Wei T, Yang H, Zhou Y. Extreme Membrane Tensile Loads Induce Half-Activation of the Thermosensitive TRPV1 Channel. J Phys Chem Lett 2022; 13:6306-6310. [PMID: 35792613 DOI: 10.1021/acs.jpclett.2c01206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Transient receptor potential (TRP) channels are sensors for a wide range of cellular and environmental signals, but elucidating how these channels convert a wide range of physical and chemical stimuli into channel opening is essential to understanding their normal function. Here, half-activation of thermosensitive TRPV1 channel under extreme membrane stretching from blast loads was provided by molecular dynamics simulations. The results show that such extreme membrane stretch loading will only lead to half-activation of the TRPV1 channel: that is, the upper gate is open for high-speed stretching (>15m/s), but the lower gate is still closed. The corresponding activation threshold also depends on both the tensile speed and the area strain. This means that the direct mechanical gating of TRP channels in one step is unlikely to occur.
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Affiliation(s)
- Lingzhi Gu
- Institute of Chemical Materials, China Academy of Engineering and Physics, Mianyang 621900, China
| | - Mi Zhou
- Institute of Chemical Materials, China Academy of Engineering and Physics, Mianyang 621900, China
| | - Tong Wei
- Institute of Chemical Materials, China Academy of Engineering and Physics, Mianyang 621900, China
| | - Hong Yang
- Institute of Chemical Materials, China Academy of Engineering and Physics, Mianyang 621900, China
| | - Yang Zhou
- Institute of Chemical Materials, China Academy of Engineering and Physics, Mianyang 621900, China
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13
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Yu X, Nguyen TT, Wu T, Ghajari M. Non-Lethal Blasts can Generate Cavitation in Cerebrospinal Fluid While Severe Helmeted Impacts Cannot: A Novel Mechanism for Blast Brain Injury. Front Bioeng Biotechnol 2022; 10:808113. [PMID: 35875481 PMCID: PMC9302597 DOI: 10.3389/fbioe.2022.808113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 06/17/2022] [Indexed: 11/13/2022] Open
Abstract
Cerebrospinal fluid (CSF) cavitation is a likely physical mechanism for producing traumatic brain injury (TBI) under mechanical loading. In this study, we investigated CSF cavitation under blasts and helmeted impacts which represented loadings in battlefield and road traffic/sports collisions. We first predicted the human head response under the blasts and impacts using computational modelling and found that the blasts can produce much lower negative pressure at the contrecoup CSF region than the impacts. Further analysis showed that the pressure waves transmitting through the skull and soft tissue are responsible for producing the negative pressure at the contrecoup region. Based on this mechanism, we hypothesised that blast, and not impact, can produce CSF cavitation. To test this hypothesis, we developed a one-dimensional simplified surrogate model of the head and exposed it to both blasts and impacts. The test results confirmed the hypothesis and computational modelling of the tests validated the proposed mechanism. These findings have important implications for prevention and diagnosis of blast TBI.
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Affiliation(s)
- Xiancheng Yu
- HEAD lab, Dyson School of Design Engineering, Imperial College London, London, United Kingdom
- Centre for Blast Injury Studies, Imperial College London, London, United Kingdom
- *Correspondence: Xiancheng Yu,
| | - Thuy-Tien Nguyen
- Centre for Blast Injury Studies, Imperial College London, London, United Kingdom
- Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Tianchi Wu
- Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Mazdak Ghajari
- HEAD lab, Dyson School of Design Engineering, Imperial College London, London, United Kingdom
- Centre for Blast Injury Studies, Imperial College London, London, United Kingdom
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14
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Vasospasm Surveillance by a Simplified Transcranial Doppler Protocol in Traumatic Brain Injury. World Neurosurg 2022; 164:e318-e325. [PMID: 35504479 DOI: 10.1016/j.wneu.2022.04.108] [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: 03/28/2022] [Revised: 04/24/2022] [Accepted: 04/25/2022] [Indexed: 11/24/2022]
Abstract
OBJECTIVE To detect post-traumatic vasospasm in patients with traumatic brain injury (TBI), we implemented a simplified transcranial Doppler (TCD) surveillance protocol in a neurointensive care setting. In this study, we evaluate the yield of this protocol. METHODS Adult patients with TBI admitted to the neurointensive care unit were examined with TCD by 2 intensive care nurses trained in TCD examinations. Flow velocities of the middle cerebral arteries were recorded. TCD suspected vasospasm was defined as the mean flow velocity >120 cm/s, and when detected, the protocol recommended a supplementary computed tomography angiography. The rate of detection of TCD suspected vasospasm and the subsequent rate of radiological diagnosis of vasospasm were recorded. In multivariate logistic regression analysis, we evaluated age, initial Glasgow Coma Scale, craniotomy, and decompressive craniectomy as potential predictors of developing increased TCD velocity. RESULTS A total of 84 patients with TBI with a median initial Glasgow Coma Scale score of 6 were examined by TCD. TCD suspected vasospasm was found in the middle cerebral arteries of 18% of examined patients. Two-thirds of patients with TCD suspected vasospasm were investigated with a subsequent computed tomography angiography, and 80% of these patients received a radiological diagnosis of vasospasm. In logistic regression analysis, decompressive craniectomy was significantly associated with increased risk of developing TCD suspected vasospasm (odds ratio: 11.57, 95% confidence interval: 2.59-51.73, P = 0.001). CONCLUSIONS The implementation of a simplified TCD surveillance protocol in a neurointensive care setting yielded an 18% detection rate of TCD suspected vasospasm. In our cohort of patients with TBI, decompressive craniectomy was associated with increased risk of developing TCD suspected vasospasm.
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15
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Golub VM, Reddy DS. Post-Traumatic Epilepsy and Comorbidities: Advanced Models, Molecular Mechanisms, Biomarkers, and Novel Therapeutic Interventions. Pharmacol Rev 2022; 74:387-438. [PMID: 35302046 PMCID: PMC8973512 DOI: 10.1124/pharmrev.121.000375] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Post-traumatic epilepsy (PTE) is one of the most devastating long-term, network consequences of traumatic brain injury (TBI). There is currently no approved treatment that can prevent onset of spontaneous seizures associated with brain injury, and many cases of PTE are refractory to antiseizure medications. Post-traumatic epileptogenesis is an enduring process by which a normal brain exhibits hypersynchronous excitability after a head injury incident. Understanding the neural networks and molecular pathologies involved in epileptogenesis are key to preventing its development or modifying disease progression. In this article, we describe a critical appraisal of the current state of PTE research with an emphasis on experimental models, molecular mechanisms of post-traumatic epileptogenesis, potential biomarkers, and the burden of PTE-associated comorbidities. The goal of epilepsy research is to identify new therapeutic strategies that can prevent PTE development or interrupt the epileptogenic process and relieve associated neuropsychiatric comorbidities. Therefore, we also describe current preclinical and clinical data on the treatment of PTE sequelae. Differences in injury patterns, latency period, and biomarkers are outlined in the context of animal model validation, pathophysiology, seizure frequency, and behavior. Improving TBI recovery and preventing seizure onset are complex and challenging tasks; however, much progress has been made within this decade demonstrating disease modifying, anti-inflammatory, and neuroprotective strategies, suggesting this goal is pragmatic. Our understanding of PTE is continuously evolving, and improved preclinical models allow for accelerated testing of critically needed novel therapeutic interventions in military and civilian persons at high risk for PTE and its devastating comorbidities.
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Affiliation(s)
- Victoria M Golub
- Department of Neuroscience and Experimental Therapeutics, College of Medicine, Texas A&M University Health Science Center, Bryan, Texas
| | - Doodipala Samba Reddy
- Department of Neuroscience and Experimental Therapeutics, College of Medicine, Texas A&M University Health Science Center, Bryan, Texas
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16
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Kerwin J, Yücesoy A, Vidhate S, Dávila-Montero BM, Van Orman JL, Pence TJ, Tartis M, Mejía-Alvarez R, Willis AM. Sulcal Cavitation in Linear Head Acceleration: Possible Correlation With Chronic Traumatic Encephalopathy. Front Neurol 2022; 13:832370. [PMID: 35295830 PMCID: PMC8918564 DOI: 10.3389/fneur.2022.832370] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 01/10/2022] [Indexed: 12/14/2022] Open
Abstract
Traumatic Brain Injury (TBI) is a significant public health and financial concern that is affecting tens of thousands of people in the United States annually. There were over a million hospital visits related to TBI in 2017. Along with immediate and short-term morbidity from TBI, chronic traumatic encephalopathy (CTE) can have life-altering, chronic morbidity, yet the direct linkage of how head impacts lead to this pathology remains unknown. A possible clue is that chronic traumatic encephalopathy appears to initiate in the depths of the sulci. The purpose of this study was to isolate the injury mechanism/s associated with blunt force impact events. To this end, drop tower experiments were performed on a human head phantom. Our phantom was fabricated into a three-dimensional extruded ellipsoid geometry made out of Polyacrylamide gelatin that incorporated gyri-sulci interaction. The phantom was assembled into a polylactic acid 3D-printed skull, surrounded with deionized water, and enclosed between two optical windows. The phantom received repetitive low-force impacts on the order of magnitude of an average boxing punch. Intracranial pressure profiles were recorded in conjunction with high-speed imaging, 25 k frames-per-second. Cavitation was observed in all trials. Cavitation is the spontaneous formation of vapor bubbles in the liquid phase resulting from a pressure drop that reaches the vapor pressure of the liquid. The observed cavitation was predominately located in the contrecoup during negative pressure phases of local intracranial pressure. To further investigate the cavitation interaction with the brain tissue phantom, a 2D plane strain computational model was built to simulate the deformation of gyrated tissue as a result from the initiation of cavitation bubbles seen in the phantom experiments. These computational experiments demonstrated a focusing of strain at the depths of the sulci from bubble expansion. Our results add further evidence that mechanical interactions could contribute to the development of chronic traumatic encephalopathy and also that fluid cavitation may play a role in this interaction.
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Affiliation(s)
- Joseph Kerwin
- Department of Mechanical Engineering, Michigan State University, East Lansing, MI, United States
| | - Atacan Yücesoy
- Department of Mechanical Engineering, Michigan State University, East Lansing, MI, United States
| | - Suhas Vidhate
- Department of Mechanical Engineering, Michigan State University, East Lansing, MI, United States
| | - Bianca M. Dávila-Montero
- Department of Mechanical Engineering, Michigan State University, East Lansing, MI, United States
| | - Jacob L. Van Orman
- Department of Neurology, Brooke Army Medical Center, Fort Sam Houston, TX, United States
| | - Thomas J. Pence
- Department of Mechanical Engineering, Michigan State University, East Lansing, MI, United States
| | - Michaelann Tartis
- Department of Chemical Engineering, New Mexico Institute of Mining and Technology, Socorro, NM, United States
| | - Ricardo Mejía-Alvarez
- Department of Mechanical Engineering, Michigan State University, East Lansing, MI, United States
- *Correspondence: Ricardo Mejía-Alvarez
| | - Adam M. Willis
- Department of Mechanical Engineering, Michigan State University, East Lansing, MI, United States
- Department of Neurology, Brooke Army Medical Center, Fort Sam Houston, TX, United States
- Adam M. Willis
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17
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Behavior of Rats in the Open Field within the Early Period after Light-Degree Blast-Induced Neurotrauma. NEUROPHYSIOLOGY+ 2022. [DOI: 10.1007/s11062-022-09921-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Mira RG, Lira M, Cerpa W. Traumatic Brain Injury: Mechanisms of Glial Response. Front Physiol 2021; 12:740939. [PMID: 34744783 PMCID: PMC8569708 DOI: 10.3389/fphys.2021.740939] [Citation(s) in RCA: 76] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 09/20/2021] [Indexed: 11/17/2022] Open
Abstract
Traumatic brain injury (TBI) is a heterogeneous disorder that involves brain damage due to external forces. TBI is the main factor of death and morbidity in young males with a high incidence worldwide. TBI causes central nervous system (CNS) damage under a variety of mechanisms, including synaptic dysfunction, protein aggregation, mitochondrial dysfunction, oxidative stress, and neuroinflammation. Glial cells comprise most cells in CNS, which are mediators in the brain’s response to TBI. In the CNS are present astrocytes, microglia, oligodendrocytes, and polydendrocytes (NG2 cells). Astrocytes play critical roles in brain’s ion and water homeostasis, energy metabolism, blood-brain barrier, and immune response. In response to TBI, astrocytes change their morphology and protein expression. Microglia are the primary immune cells in the CNS with phagocytic activity. After TBI, microglia also change their morphology and release both pro and anti-inflammatory mediators. Oligodendrocytes are the myelin producers of the CNS, promoting axonal support. TBI causes oligodendrocyte apoptosis, demyelination, and axonal transport disruption. There are also various interactions between these glial cells and neurons in response to TBI that contribute to the pathophysiology of TBI. In this review, we summarize several glial hallmarks relevant for understanding the brain injury and neuronal damage under TBI conditions.
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Affiliation(s)
- Rodrigo G Mira
- Laboratorio de Función y Patología Neuronal, Departamento de Biología Celular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Matías Lira
- Laboratorio de Función y Patología Neuronal, Departamento de Biología Celular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Waldo Cerpa
- Laboratorio de Función y Patología Neuronal, Departamento de Biología Celular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.,Centro de Excelencia en Biomedicina de Magallanes (CEBIMA), Universidad de Magallanes, Punta Arenas, Chile
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19
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Belding JN, Khokhar B, Englert RM, Fitzmaurice S, Thomsen CJ. The Persistence of Blast- Versus Impact-Induced Concussion Symptomology Following Deployment. J Head Trauma Rehabil 2021; 36:E397-E405. [PMID: 34320556 DOI: 10.1097/htr.0000000000000715] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To examine the persistence of concussion-related symptoms following injury as a function of mechanism of injury (high-level blast [HLB] vs impact) and low-level blast (LLB) exposure among Marines. SETTING Upon return from deployment and approximately 6 months later, respectively, Marines completed the Post-Deployment Health Assessment and Post-Deployment Health Re-Assessment in an operational or clinic setting. PARTICIPANTS Data from active duty enlisted Marines who completed both assessments (n = 102 075) and who reported a potentially mild traumatic brain injury (mTBI)-inducing event and completed an mTBI screen (n = 8106) were analyzed. DESIGN This was a retrospective cohort study of Marines deployed between 2008 and 2012. Marines were categorized into groups with relatively high versus low risk for occupational risk of LLB exposure. A mixed model analysis of variance was used to examine the number of symptoms Marines reported experiencing during deployment as a function of probable concussion, HLB exposure, occupational risk, type of symptom, and time of measurement. MAIN MEASURES Self-reported deployment exposures including HLB, probable mTBIs, and occupational risk of LLB exposure were identified. Outcomes included the proportion of neurological, musculoskeletal, and immunological symptoms for which Marines reported seeking care during and following deployment were analyzed. RESULTS Probable HLB-induced mTBIs (vs impact-induced) were associated with significantly more neurological symptoms at return from deployment and approximately 6 months later. Although symptom reporting decreased at statistically equivalent rates regardless of mechanism of injury, those with a probable HLB-induced concussion continued to report elevated symptomology post-deployment. Additionally, Marines with probable concussion working in occupations with LLB exposure reported elevated levels of persistent neurological symptoms. Both HLB and LLB exposure were associated with neurological symptoms that persisted following deployment. CONCLUSION These findings suggest that blast-induced brain injuries may be fundamentally different from impact-induced injuries, and that additional screening and symptomatic treatment for blast-exposed patients may be warranted.
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Affiliation(s)
- Jennifer N Belding
- Leidos, San Diego, California (Dr Belding and Mss Englert and Fitzmaurice); Health and Behavioral Sciences Department, Naval Health Research Center, San Diego, California (Drs Belding and Thomsen and Mss Englert and Fitzmaurice); and Traumatic Brain Injury Center of Excellence, Silver Spring, and General Dynamics Information Technology, Silver Spring, Maryland (Dr Khokhar)
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20
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Hasan F, Al Mahmud KAH, Khan MI, Kang W, Adnan A. Effect of random fiber networks on bubble growth in gelatin hydrogels. SOFT MATTER 2021; 17:9293-9314. [PMID: 34647568 DOI: 10.1039/d1sm00587a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In hydrodynamics, the event of dynamic bubble growth in a pure liquid under tensile pressure is known as cavitation. The same event can also be observed in soft materials (e.g., elastomers and hydrogels). However, for soft materials, bubble/cavity growth is either defined as cavitation if the bubble growth is elastic and reversible or as fracture if the cavity growth is by material failure and irreversible. In any way, bubble growth can cause damage to soft materials (e.g., tissue) by inducing high strain and strain-rate deformation. Additionally, a high-strength pressure wave is generated upon the collapse of the bubble. Therefore, it is crucial to identify the critical condition of spontaneous bubble growth in soft materials. Experimental and theoretical observations have agreed that the onset of bubble growth in soft materials requires higher tensile pressure than pure water. The extra tensile pressure is required since the cavitating bubble needs to overcome the elastic and surface energy in soft materials. In this manuscript, we developed two models to study and quantify the extra tensile pressure for different gelatin concentrations. Both the models are then compared with the existing cavitation onset criteria of rubber-like materials. Validation is done with the experimental results of threshold tensile pressure for different gelatin concentrations. Both models can moderately predict the extra tensile pressure within the intermediate range of gelatin concentrations (3-7% [w/v]). For low concentration (∼1%), the network's non-affinity plays a significant role and must be incorporated. On the other hand, for higher concentrations (∼10%), the entropic deformation dominates, and the strain energy formulation is not adequate.
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Affiliation(s)
- Fuad Hasan
- Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, USA.
- Woolf Hall, Room 315C, Arlington, TX 76019, USA
| | - K A H Al Mahmud
- Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, USA.
- Woolf Hall, Room 315C, Arlington, TX 76019, USA
| | - Md Ishak Khan
- Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, USA.
- Woolf Hall, Room 315C, Arlington, TX 76019, USA
| | - Wonmo Kang
- School for Engineering of Matter, Transport and Energy, Arizona State University, USA
| | - Ashfaq Adnan
- Department of Mechanical and Aerospace Engineering, The University of Texas at Arlington, USA.
- Woolf Hall, Room 315C, Arlington, TX 76019, USA
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21
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Sundar S, Ponnalagu A. Biomechanical Analysis of Head Subjected to Blast Waves and the Role of Combat Protective Headgear Under Blast Loading: A Review. J Biomech Eng 2021; 143:100801. [PMID: 33954580 DOI: 10.1115/1.4051047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Indexed: 01/10/2023]
Abstract
Blast-induced traumatic brain injury (bTBI) is a rising health concern of soldiers deployed in modern-day military conflicts. For bTBI, blast wave loading is a cause, and damage incurred to brain tissue is the effect. There are several proposed mechanisms for the bTBI, such as direct cranial entry, skull flexure, thoracic compression, blast-induced acceleration, and cavitation that are not mutually exclusive. So the cause-effect relationship is not straightforward. The efficiency of protective headgears against blast waves is relatively unknown as compared with other threats. Proper knowledge about standard problem space, underlying mechanisms, blast reconstruction techniques, and biomechanical models are essential for protective headgear design and evaluation. Various researchers from cross disciplines analyze bTBI from different perspectives. From the biomedical perspective, the physiological response, neuropathology, injury scales, and even the molecular level and cellular level changes incurred during injury are essential. From a combat protective gear designer perspective, the spatial and temporal variation of mechanical correlates of brain injury such as surface overpressure, acceleration, tissue-level stresses, and strains are essential. This paper outlines the key inferences from bTBI studies that are essential in the protective headgear design context.
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Affiliation(s)
- Shyam Sundar
- Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600036, India
| | - Alagappan Ponnalagu
- Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600036, India
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22
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Gu L, Wei T, Zhou M, Yang H, Zhou Y. Impact of Lipid Peroxidation on the Response of Cell Membranes to High-Speed Equibiaxial Stretching: A Computational Study. J Phys Chem B 2021; 125:10736-10747. [PMID: 34524826 DOI: 10.1021/acs.jpcb.1c05544] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The difference between diseased and healthy cellular membranes in response to mechanical stresses is crucial for biology, as well as in the development of medical devices. However, the biomolecular mechanisms by which mechanical stresses interact with diseased cellular components remain largely unknown. In this work, we focus on the response of diseased cellular membranes with lipid peroxidation to high-speed tensile loadings. We find that the critical areal strain (ξc, when the pore forms) is highly sensitive to lipid peroxidation. For example, ξc of a fully oxidized bilayer is only 64 and 69% of the nonoxidized one at the stretching speed of 0.1 and 0.6 m/s, respectively. ξc decreases with the increase in the oxidized lipid ratio, regardless of the speeds. Also, the critical rupture tension of membranes exhibits a similar change. It is obvious that the oxidized membranes are more easily damaged than normal ones by high-speed stretching, which coincides with experimental findings. The reason is that peroxidation introduces a polar group to the tail of lipids, increases the hydrophilicity of tails, and warps the tails to the membrane-water interface, which causes loose accumulation and disorder of lipid tails. This can be deduced from the variation in the area per lipid and order parameter. In addition, the lowering stretching modulus and line tension of membranes (i.e., softening) after lipid peroxidation is also a significant factor. We reveal the difference between the peroxidized (diseased) and normal membrane in response to high-speed stretching, give the ξc value in the pore formation of membranes and analyze the influence of the stretching speed, peroxidation ratio, and molecular structure of phospholipids. We hope that the molecular-level information will be useful for the development of biological and medical devices in the future.
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Affiliation(s)
- Lingzhi Gu
- Institute of Chemical Materials, China Academy of Engineering and Physics, Mianyang 621900, China
| | - Tong Wei
- Institute of Chemical Materials, China Academy of Engineering and Physics, Mianyang 621900, China.,CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China
| | - Mi Zhou
- Institute of Chemical Materials, China Academy of Engineering and Physics, Mianyang 621900, China.,School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Hong Yang
- Institute of Chemical Materials, China Academy of Engineering and Physics, Mianyang 621900, China
| | - Yang Zhou
- Institute of Chemical Materials, China Academy of Engineering and Physics, Mianyang 621900, China
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23
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Pouladian P, Yamauchi T, Wakida NM, Gomez-Godinez V, Berns MW, Preece D. Combining quantitative phase microscopy and laser-induced shockwave for the study of cell injury. BIOMEDICAL OPTICS EXPRESS 2021; 12:4020-4031. [PMID: 34457396 PMCID: PMC8367238 DOI: 10.1364/boe.427693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 05/22/2021] [Accepted: 05/24/2021] [Indexed: 06/13/2023]
Abstract
In this paper, we propose a new system for studying cellular injury. The system is a biophotonic work station that can generate Laser-Induced Shockwave (LIS) in the cell culture medium combined with a Quantitative Phase Microscope (QPM), enabling the real-time measurement of intracellular dynamics and quantitative changes in cellular thickness during the damage and recovery processes. In addition, the system is capable of Phase Contrast (PhC) and Differential Interference Contrast (DIC) microscopy. Our studies showed that QPM allows us to discern changes that otherwise would be unnoticeable or difficult to detect using phase or DIC imaging. As one application, this system enables the study of traumatic brain injury in vitro. Astrocytes are the most numerous cells in the central nervous system (CNS) and have been shown to play a role in the repair of damaged neuronal tissue. In this study, we use LIS to create a precise mechanical force in the culture medium at a controlled distance from astrocytes and measure the quantitative changes, in order of nanometers, in cell thickness. Experiments were performed in different cell culture media in order to evaluate the reproducibility of the experimental method.
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Affiliation(s)
- Pegah Pouladian
- Beckman Laser Institute, Department of Biomedical Engineering, University of California Irvine, CA 92617, USA
| | - Toyohiko Yamauchi
- Hamamatsu Photonics K. K., 5000 Hirakuchi, Hamakita, Shizuoka 434-8601, Japan
| | - Nicole M Wakida
- Beckman Laser Institute, Department of Biomedical Engineering, University of California Irvine, CA 92617, USA
| | - Veronica Gomez-Godinez
- Institute of Engineering in Medicine, University of California, San Diego, San Diego CA 92093, USA
| | - Michael W Berns
- Beckman Laser Institute, Department of Biomedical Engineering, University of California Irvine, CA 92617, USA
| | - Daryl Preece
- Beckman Laser Institute, Department of Biomedical Engineering, University of California Irvine, CA 92617, USA
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24
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Kawoos U, Abutarboush R, Gu M, Chen Y, Statz JK, Goodrich SY, Ahlers ST. Blast-induced temporal alterations in blood-brain barrier properties in a rodent model. Sci Rep 2021; 11:5906. [PMID: 33723300 PMCID: PMC7971015 DOI: 10.1038/s41598-021-84730-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 02/09/2021] [Indexed: 01/07/2023] Open
Abstract
The consequences of blast-induced traumatic brain injury (bTBI) on the blood–brain barrier (BBB) and components of the neurovascular unit are an area of active research. In this study we assessed the time course of BBB integrity in anesthetized rats exposed to a single blast overpressure of 130 kPa (18.9 PSI). BBB permeability was measured in vivo via intravital microscopy by imaging extravasation of fluorescently labeled tracers (40 kDa and 70 kDa molecular weight) through the pial microvasculature into brain parenchyma at 2–3 h, 1, 3, 14, or 28 days after the blast exposure. BBB structural changes were assessed by immunostaining and molecular assays. At 2–3 h and 1 day after blast exposure, significant increases in the extravasation of the 40 kDa but not the 70 kDa tracers were observed, along with differential reductions in the expression of tight junction proteins (occludin, claudin-5, zona occluden-1) and increase in the levels of the astrocytic water channel protein, AQP-4, and matrix metalloprotease, MMP-9. Nearly all of these measures were normalized by day 3 and maintained up to 28 days post exposure. These data demonstrate that blast-induced changes in BBB permeability are closely coupled to structural and functional components of the BBB.
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Affiliation(s)
- Usmah Kawoos
- Neurotrauma Department, Naval Medical Research Center, 503 Robert Grant Ave, Silver Spring, MD, 20910, USA. .,The Henry M. Jackson Foundation for the Advancement of Military Medicine Inc, Bethesda, MD, USA.
| | - Rania Abutarboush
- Neurotrauma Department, Naval Medical Research Center, 503 Robert Grant Ave, Silver Spring, MD, 20910, USA.,The Henry M. Jackson Foundation for the Advancement of Military Medicine Inc, Bethesda, MD, USA
| | - Ming Gu
- Neurotrauma Department, Naval Medical Research Center, 503 Robert Grant Ave, Silver Spring, MD, 20910, USA.,The Henry M. Jackson Foundation for the Advancement of Military Medicine Inc, Bethesda, MD, USA
| | - Ye Chen
- Neurotrauma Department, Naval Medical Research Center, 503 Robert Grant Ave, Silver Spring, MD, 20910, USA.,The Henry M. Jackson Foundation for the Advancement of Military Medicine Inc, Bethesda, MD, USA
| | - Jonathan K Statz
- Neurotrauma Department, Naval Medical Research Center, 503 Robert Grant Ave, Silver Spring, MD, 20910, USA.,The Henry M. Jackson Foundation for the Advancement of Military Medicine Inc, Bethesda, MD, USA
| | - Samantha Y Goodrich
- Neurotrauma Department, Naval Medical Research Center, 503 Robert Grant Ave, Silver Spring, MD, 20910, USA.,The Henry M. Jackson Foundation for the Advancement of Military Medicine Inc, Bethesda, MD, USA
| | - Stephen T Ahlers
- Neurotrauma Department, Naval Medical Research Center, 503 Robert Grant Ave, Silver Spring, MD, 20910, USA
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25
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Marsh JL, Bentil SA. Cerebrospinal Fluid Cavitation as a Mechanism of Blast-Induced Traumatic Brain Injury: A Review of Current Debates, Methods, and Findings. Front Neurol 2021; 12:626393. [PMID: 33776887 PMCID: PMC7994250 DOI: 10.3389/fneur.2021.626393] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 02/18/2021] [Indexed: 11/15/2022] Open
Abstract
Cavitation has gained popularity in recent years as a potential mechanism of blast-induced traumatic brain injury (bTBI). This review presents the most prominent debates on cavitation; how bubbles can form or exist within the cerebrospinal fluid (CSF) and brain vasculature, potential mechanisms of cellular, and tissue level damage following the collapse of bubbles in response to local pressure fluctuations, and a survey of experimental and computational models used to address cavitation research questions. Due to the broad and varied nature of cavitation research, this review attempts to provide a necessary synthesis of cavitation findings relevant to bTBI, and identifies key areas where additional work is required. Fundamental questions about the viability and likelihood of CSF cavitation during blast remain, despite a variety of research regarding potential injury pathways. Much of the existing literature on bTBI evaluates cavitation based off its prima facie plausibility, while more rigorous evaluation of its likelihood becomes increasingly necessary. This review assesses the validity of some of the common assumptions in cavitation research, as well as highlighting outstanding questions that are essential in future work.
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Affiliation(s)
- Jenny L Marsh
- The Bentil Group, Department of Mechanical Engineering, Iowa State University, Ames, IA, United States
| | - Sarah A Bentil
- The Bentil Group, Department of Mechanical Engineering, Iowa State University, Ames, IA, United States
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26
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Belding JN, Englert RM, Fitzmaurice S, Jackson JR, Koenig HG, Hunter MA, Thomsen CJ, da Silva UO. Potential Health and Performance Effects of High-Level and Low-Level Blast: A Scoping Review of Two Decades of Research. Front Neurol 2021; 12:628782. [PMID: 33776888 PMCID: PMC7987950 DOI: 10.3389/fneur.2021.628782] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 02/10/2021] [Indexed: 01/06/2023] Open
Abstract
Although blast exposure has been recognized as a significant source of morbidity and mortality in military populations, our understanding of the effects of blast exposure, particularly low-level blast (LLB) exposure, on health outcomes remains limited. This scoping review provides a comprehensive, accessible review of the peer-reviewed literature that has been published on blast exposure over the past two decades, with specific emphasis on LLB. We conducted a comprehensive scoping review of the scientific literature published between January 2000 and 2019 pertaining to the effects of blast injury and/or exposure on human and animal health. A three-level review process with specific inclusion and exclusion criteria was used. A full-text review of all articles pertaining to LLB exposure was conducted and relevant study characteristics were extracted. The research team identified 3,215 blast-relevant articles, approximately half of which (55.4%) studied live humans, 16% studied animals, and the remainder were non-subjects research (e.g., literature reviews). Nearly all (99.49%) of the included studies were conducted by experts in medicine or epidemiology; approximately half of these articles were categorized into more than one medical specialty. Among the 51 articles identified as pertaining to LLB specifically, 45.1% were conducted on animals and 39.2% focused on human subjects. Animal studies of LLB predominately used shock tubes to induce various blast exposures in rats, assessed a variety of outcomes, and clearly demonstrated that LLB exposure is associated with brain injury. In contrast, the majority of LLB studies on humans were conducted among military and law enforcement personnel in training environments and had remarkable variability in the exposures and outcomes assessed. While findings suggest that there is the potential for LLB to harm human populations, findings are mixed and more research is needed. Although it is clear that more research is needed on this rapidly growing topic, this review highlights the detrimental effects of LLB on the health of both animals and humans. Future research would benefit from multidisciplinary collaboration, larger sample sizes, and standardization of terminology, exposures, and outcomes.
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Affiliation(s)
- Jennifer N. Belding
- Defense Health Group, Leidos, San Diego, CA, United States
- Health and Behavioral Sciences Department, Naval Health Research Center, San Diego, CA, United States
| | - Robyn M. Englert
- Defense Health Group, Leidos, San Diego, CA, United States
- Health and Behavioral Sciences Department, Naval Health Research Center, San Diego, CA, United States
| | - Shannon Fitzmaurice
- Defense Health Group, Leidos, San Diego, CA, United States
- Health and Behavioral Sciences Department, Naval Health Research Center, San Diego, CA, United States
| | - Jourdan R. Jackson
- Defense Health Group, Leidos, San Diego, CA, United States
- Health and Behavioral Sciences Department, Naval Health Research Center, San Diego, CA, United States
| | - Hannah G. Koenig
- Defense Health Group, Leidos, San Diego, CA, United States
- Health and Behavioral Sciences Department, Naval Health Research Center, San Diego, CA, United States
| | - Michael A. Hunter
- Defense Health Group, Leidos, San Diego, CA, United States
- Health and Behavioral Sciences Department, Naval Health Research Center, San Diego, CA, United States
| | - Cynthia J. Thomsen
- Health and Behavioral Sciences Department, Naval Health Research Center, San Diego, CA, United States
| | - Uade Olaghere da Silva
- Health and Behavioral Sciences Department, Naval Health Research Center, San Diego, CA, United States
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27
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Gomez Godinez V, Morar V, Carmona C, Gu Y, Sung K, Shi LZ, Wu C, Preece D, Berns MW. Laser-Induced Shockwave (LIS) to Study Neuronal Ca 2+ Responses. Front Bioeng Biotechnol 2021; 9:598896. [PMID: 33681154 PMCID: PMC7928400 DOI: 10.3389/fbioe.2021.598896] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 01/27/2021] [Indexed: 12/28/2022] Open
Abstract
Laser-induced shockwaves (LIS) can be utilized as a method to subject cells to conditions similar to those occurring during a blast-induced traumatic brain injury. The pairing of LIS with genetically encoded biosensors allows researchers to monitor the immediate molecular events resulting from such an injury. In this study, we utilized the genetically encoded Ca2+ FRET biosensor D3CPV to study the immediate Ca2+ response to laser-induced shockwave in cortical neurons and Schwann cells. Our results show that both cell types exhibit a transient Ca2+ increase irrespective of extracellular Ca2+ conditions. LIS allows for the simultaneous monitoring of the effects of shear stress on cells, as well as nearby cell damage and death.
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Affiliation(s)
- Veronica Gomez Godinez
- Institute of Engineering in Medicine, University of California, San Diego, San Diego, CA, United States
| | - Vikash Morar
- Institute of Engineering in Medicine, University of California, San Diego, San Diego, CA, United States
| | - Christopher Carmona
- Institute of Engineering in Medicine, University of California, San Diego, San Diego, CA, United States
| | - Yingli Gu
- Department of Neurosciences, University of California, San Diego, San Diego, CA, United States
| | - Kijung Sung
- Department of Neurosciences, University of California, San Diego, San Diego, CA, United States
| | - Linda Z Shi
- Institute of Engineering in Medicine, University of California, San Diego, San Diego, CA, United States
| | - Chengbiao Wu
- Department of Neurosciences, University of California, San Diego, San Diego, CA, United States
| | - Daryl Preece
- Beckman Laser Institute and Medical Clinic, University of California, Irvine, Irvine, CA, United States.,Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, United States
| | - Michael W Berns
- Beckman Laser Institute and Medical Clinic, University of California, Irvine, Irvine, CA, United States.,Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, United States.,Department of Developmental and Cell Biology, School of Biological Sciences, University of California, Irvine, Irvine, CA, United States
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28
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Hasan F, Al Mahmud KAH, Khan MI, Patil S, Dennis BH, Adnan A. Cavitation Induced Damage in Soft Biomaterials. ACTA ACUST UNITED AC 2021. [DOI: 10.1007/s42493-021-00060-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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29
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Alyenbaawi H, Kanyo R, Locskai LF, Kamali-Jamil R, DuVal MG, Bai Q, Wille H, Burton EA, Allison WT. Seizures are a druggable mechanistic link between TBI and subsequent tauopathy. eLife 2021; 10:e58744. [PMID: 33527898 PMCID: PMC7853719 DOI: 10.7554/elife.58744] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Accepted: 12/07/2020] [Indexed: 12/18/2022] Open
Abstract
Traumatic brain injury (TBI) is a prominent risk factor for dementias including tauopathies like chronic traumatic encephalopathy (CTE). The mechanisms that promote prion-like spreading of Tau aggregates after TBI are not fully understood, in part due to lack of tractable animal models. Here, we test the putative role of seizures in promoting the spread of tauopathy. We introduce 'tauopathy reporter' zebrafish expressing a genetically encoded fluorescent Tau biosensor that reliably reports accumulation of human Tau species when seeded via intraventricular brain injections. Subjecting zebrafish larvae to a novel TBI paradigm produced various TBI features including cell death, post-traumatic seizures, and Tau inclusions. Bath application of dynamin inhibitors or anticonvulsant drugs rescued TBI-induced tauopathy and cell death. These data suggest a role for seizure activity in the prion-like seeding and spreading of tauopathy following TBI. Further work is warranted regarding anti-convulsants that dampen post-traumatic seizures as a route to moderating subsequent tauopathy.
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Affiliation(s)
- Hadeel Alyenbaawi
- Centre for Prions & Protein Folding Disease, University of AlbertaEdmontonCanada
- Department of Medical Genetics, University of AlbertaEdmontonCanada
- Majmaah UniversityMajmaahSaudi Arabia
| | - Richard Kanyo
- Centre for Prions & Protein Folding Disease, University of AlbertaEdmontonCanada
- Department of Biological Sciences, University of AlbertaEdmontonCanada
| | - Laszlo F Locskai
- Centre for Prions & Protein Folding Disease, University of AlbertaEdmontonCanada
- Department of Biological Sciences, University of AlbertaEdmontonCanada
| | - Razieh Kamali-Jamil
- Centre for Prions & Protein Folding Disease, University of AlbertaEdmontonCanada
- Department of Biochemistry, University of AlbertaEdmontonCanada
| | - Michèle G DuVal
- Department of Biological Sciences, University of AlbertaEdmontonCanada
| | - Qing Bai
- Department of Neurology, University of PittsburghPittsburghUnited States
| | - Holger Wille
- Centre for Prions & Protein Folding Disease, University of AlbertaEdmontonCanada
- Department of Biochemistry, University of AlbertaEdmontonCanada
| | - Edward A Burton
- Department of Neurology, University of PittsburghPittsburghUnited States
- Geriatric Research, Education and Clinical Center, Pittsburgh VA Healthcare SystemPittsburghUnited States
| | - W Ted Allison
- Centre for Prions & Protein Folding Disease, University of AlbertaEdmontonCanada
- Department of Medical Genetics, University of AlbertaEdmontonCanada
- Department of Biological Sciences, University of AlbertaEdmontonCanada
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30
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Tripathi BB, Chandrasekaran S, Pinton GF. Super-resolved shear shock focusing in the human head. BRAIN MULTIPHYSICS 2021. [DOI: 10.1016/j.brain.2021.100033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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31
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Wermer A, Kerwin J, Welsh K, Mejia-Alvarez R, Tartis M, Willis A. Materials Characterization of Cranial Simulants for Blast-Induced Traumatic Brain Injury. Mil Med 2020; 185:205-213. [PMID: 32074306 DOI: 10.1093/milmed/usz228] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2019] [Revised: 01/01/2019] [Accepted: 01/01/2019] [Indexed: 01/28/2023] Open
Abstract
INTRODUCTION The mechanical response of brain tissue to high-speed forces in the blast and blunt traumatic brain injury is poorly understood. Object-to-object variation and interspecies differences are current limitations in animal and cadaver studies conducted to study damage mechanisms. Biofidelic and transparent tissue simulants allow the use of high-speed optical diagnostics during a blast event, making it possible to observe deformations and damage patterns for comparison to observed injuries seen post-mortem in traumatic brain injury victims. METHODS Material properties of several tissue simulants were quantified using standard mechanical characterization techniques, that is, shear rheometric, tensile, and compressive testing. RESULTS Polyacrylamide simulants exhibited the best optical and mechanical property matching with the fewest trade-offs in the design of a cranial test object. Polyacrylamide gels yielded densities of ~1.04 g/cc and shear moduli ranging 1.3-14.55 kPa, allowing gray and white matter simulant tuning to a 30-35% difference in shear for biofidelity. CONCLUSIONS These materials are intended for use as layered cranial phantoms in a shock tube and open field blasts, with focus on observing phenomena occurring at the interfaces of adjacent tissue simulant types or material-fluid boundaries. Mechanistic findings from these studies may be used to inform the design of protective gear to mitigate blast injuries.
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Affiliation(s)
- Anna Wermer
- Department of Chemical Engineering, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801
| | - Joseph Kerwin
- Department of Mechanical Engineering, Michigan State University, 1449 Engineering Research Ct. A117, East Lansing, MI 48824
| | - Kelsea Welsh
- Department of Chemical Engineering, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801
| | - Ricardo Mejia-Alvarez
- Department of Mechanical Engineering, Michigan State University, 1449 Engineering Research Ct. A117, East Lansing, MI 48824
| | - Michaelann Tartis
- Department of Chemical Engineering, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801
| | - Adam Willis
- Department of Neurology, San Antonio Military Medical Center, 3551 Roger Brooke Dr, San Antonio, TX 78219
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Muresanu DF, Sharma A, Sahib S, Tian ZR, Feng L, Castellani RJ, Nozari A, Lafuente JV, Buzoianu AD, Sjöquist PO, Patnaik R, Wiklund L, Sharma HS. Diabetes exacerbates brain pathology following a focal blast brain injury: New role of a multimodal drug cerebrolysin and nanomedicine. PROGRESS IN BRAIN RESEARCH 2020; 258:285-367. [PMID: 33223037 DOI: 10.1016/bs.pbr.2020.09.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Blast brain injury (bBI) is a combination of several forces of pressure, rotation, penetration of sharp objects and chemical exposure causing laceration, perforation and tissue losses in the brain. The bBI is quite prevalent in military personnel during combat operations. However, no suitable therapeutic strategies are available so far to minimize bBI pathology. Combat stress induces profound cardiovascular and endocrine dysfunction leading to psychosomatic disorders including diabetes mellitus (DM). This is still unclear whether brain pathology in bBI could exacerbate in DM. In present review influence of DM on pathophysiology of bBI is discussed based on our own investigations. In addition, treatment with cerebrolysin (a multimodal drug comprising neurotrophic factors and active peptide fragments) or H-290/51 (a chain-breaking antioxidant) using nanowired delivery of for superior neuroprotection on brain pathology in bBI in DM is explored. Our observations are the first to show that pathophysiology of bBI is exacerbated in DM and TiO2-nanowired delivery of cerebrolysin induces profound neuroprotection in bBI in DM, not reported earlier. The clinical significance of our findings with regard to military medicine is discussed.
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Affiliation(s)
- Dafin F Muresanu
- Department of Clinical Neurosciences, University of Medicine & Pharmacy, Cluj-Napoca, Romania; "RoNeuro" Institute for Neurological Research and Diagnostic, Cluj-Napoca, Romania
| | - Aruna Sharma
- International Experimental Central Nervous System Injury & Repair (IECNSIR), Department of Surgical Sciences, Anesthesiology & Intensive Care Medicine, Uppsala University Hospital, Uppsala University, Uppsala, Sweden.
| | - Seaab Sahib
- Department of Chemistry & Biochemistry, University of Arkansas, Fayetteville, AR, United States
| | - Z Ryan Tian
- Department of Chemistry & Biochemistry, University of Arkansas, Fayetteville, AR, United States
| | - Lianyuan Feng
- Department of Neurology, Bethune International Peace Hospital, Shijiazhuang, Hebei Province, China
| | - Rudy J Castellani
- Department of Pathology, University of Maryland, Baltimore, MD, United States
| | - Ala Nozari
- Anesthesiology & Intensive Care, Massachusetts General Hospital, Boston, MA, United States
| | - José Vicente Lafuente
- LaNCE, Department of Neuroscience, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain
| | - Anca D Buzoianu
- Department of Clinical Pharmacology and Toxicology, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Per-Ove Sjöquist
- Division of Cardiology, Department of Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
| | - Ranjana Patnaik
- Department of Biomaterials, School of Biomedical Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi, India
| | - Lars Wiklund
- International Experimental Central Nervous System Injury & Repair (IECNSIR), Department of Surgical Sciences, Anesthesiology & Intensive Care Medicine, Uppsala University Hospital, Uppsala University, Uppsala, Sweden
| | - Hari Shanker Sharma
- International Experimental Central Nervous System Injury & Repair (IECNSIR), Department of Surgical Sciences, Anesthesiology & Intensive Care Medicine, Uppsala University Hospital, Uppsala University, Uppsala, Sweden.
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33
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Meabon JS, Cook DG, Yagi M, Terry GE, Cross DJ, Muzi M, Pagulayan KF, Logsdon AF, Schindler AG, Ghai V, Wang K, Fallen S, Zhou Y, Kim TK, Lee I, Banks WA, Carlson ES, Mayer C, Hendrickson RC, Raskind MA, Marshall DA, Perl DP, Keene CD, Peskind ER. Chronic elevation of plasma vascular endothelial growth factor-A (VEGF-A) is associated with a history of blast exposure. J Neurol Sci 2020; 417:117049. [PMID: 32758764 PMCID: PMC7492467 DOI: 10.1016/j.jns.2020.117049] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 06/23/2020] [Accepted: 07/15/2020] [Indexed: 02/02/2023]
Abstract
Mounting evidence points to the significance of neurovascular-related dysfunction in veterans with blast-related mTBI, which is also associated with reduced [18F]-fluorodeoxyglucose (FDG) uptake. The goal of this study was to determine whether plasma VEGF-A is altered in veterans with blast-related mTBI and address whether VEGF-A levels correlate with FDG uptake in the cerebellum, a brain region that is vulnerable to blast-related injury 72 veterans with blast-related mTBI (mTBI) and 24 deployed control (DC) veterans with no lifetime history of TBI were studied. Plasma VEGF-A was significantly elevated in mTBIs compared to DCs. Plasma VEGF-A levels in mTBIs were significantly negatively correlated with FDG uptake in cerebellum. In addition, performance on a Stroop color/word interference task was inversely correlated with plasma VEGF-A levels in blast mTBI veterans. Finally, we observed aberrant perivascular VEGF-A immunoreactivity in postmortem cerebellar tissue and not cortical or hippocampal tissues from blast mTBI veterans. These findings add to the limited number of plasma proteins that are chronically elevated in veterans with a history of blast exposure associated with mTBI. It is likely the elevated VEGF-A levels are from peripheral sources. Nonetheless, increasing plasma VEGF-A concentrations correlated with chronically decreased cerebellar glucose metabolism and poorer performance on tasks involving cognitive inhibition and set shifting. These results strengthen an emerging view that cognitive complaints and functional brain deficits caused by blast exposure are associated with chronic blood-brain barrier injury and prolonged recovery in affected regions.
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Affiliation(s)
- James S Meabon
- Veterans Affairs (VA) Northwest Mental Illness, Research, Education, and Clinical Center (MIRECC), Seattle, WA, USA; Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA
| | - David G Cook
- Geriatric Research, Education, and Clinical Center (GRECC), Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA; Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Washington, Seattle, WA, USA; Department of Pharmacology, University of Washington, Seattle, WA, USA
| | - Mayumi Yagi
- Geriatric Research, Education, and Clinical Center (GRECC), Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
| | - Garth E Terry
- Veterans Affairs (VA) Northwest Mental Illness, Research, Education, and Clinical Center (MIRECC), Seattle, WA, USA; Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA; Department of Radiology, University of Washington, Seattle, WA, USA
| | - Donna J Cross
- Department of Radiology, University of Utah, Salt Lake City, UT, USA
| | - Mark Muzi
- Department of Radiology, University of Washington, Seattle, WA, USA
| | - Kathleen F Pagulayan
- Veterans Affairs (VA) Northwest Mental Illness, Research, Education, and Clinical Center (MIRECC), Seattle, WA, USA; Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA
| | - Aric F Logsdon
- Geriatric Research, Education, and Clinical Center (GRECC), Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA; Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Washington, Seattle, WA, USA
| | - Abigail G Schindler
- Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA; Geriatric Research, Education, and Clinical Center (GRECC), Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
| | - Vikas Ghai
- Institute for Systems Biology, Seattle, WA, USA
| | - Kai Wang
- Institute for Systems Biology, Seattle, WA, USA
| | | | - Yong Zhou
- Institute for Systems Biology, Seattle, WA, USA
| | | | - Inyoul Lee
- Institute for Systems Biology, Seattle, WA, USA
| | - William A Banks
- Geriatric Research, Education, and Clinical Center (GRECC), Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA; Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Washington, Seattle, WA, USA
| | - Erik S Carlson
- Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA; Geriatric Research, Education, and Clinical Center (GRECC), Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
| | - Cynthia Mayer
- Veterans Affairs (VA) Northwest Mental Illness, Research, Education, and Clinical Center (MIRECC), Seattle, WA, USA
| | - Rebecca C Hendrickson
- Veterans Affairs (VA) Northwest Mental Illness, Research, Education, and Clinical Center (MIRECC), Seattle, WA, USA; Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA
| | - Murray A Raskind
- Veterans Affairs (VA) Northwest Mental Illness, Research, Education, and Clinical Center (MIRECC), Seattle, WA, USA; Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA
| | | | - Daniel P Perl
- Department of Pathology, Center for Neuroscience and Regenerative Medicine, School of Medicine, Uniformed Services University, Bethesda, MD, USA
| | - C Dirk Keene
- Department of Pathology, University of Washington, Seattle, WA, USA
| | - Elaine R Peskind
- Veterans Affairs (VA) Northwest Mental Illness, Research, Education, and Clinical Center (MIRECC), Seattle, WA, USA; Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA.
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Luo JC, Ching H, Wilson BG, Mohraz A, Botvinick EL, Venugopalan V. Laser cavitation rheology for measurement of elastic moduli and failure strain within hydrogels. Sci Rep 2020; 10:13144. [PMID: 32753667 PMCID: PMC7403306 DOI: 10.1038/s41598-020-68621-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 06/12/2020] [Indexed: 01/26/2023] Open
Abstract
We introduce laser cavitation rheology (LCR) as a minimally-invasive optical method to characterize mechanical properties within the interior of biological and synthetic aqueous soft materials at high strain-rates. We utilized time-resolved photography to measure cavitation bubble dynamics generated by the delivery of focused 500 ps duration laser radiation at λ = 532 nm within fibrin hydrogels at pulse energies of Ep = 12, 18 µJ and within polyethylene glycol (600) diacrylate (PEG (600) DA) hydrogels at Ep = 2, 5, 12 µJ. Elastic moduli and failure strains of fibrin and PEG (600) DA hydrogels were calculated from these measurements by determining parameter values which provide the best fit of the measured data to a theoretical model of cavitation bubble dynamics in a Neo-Hookean viscoelastic medium subject to material failure. We demonstrate the use of this method to retrieve the local, interior elastic modulus of these hydrogels and both the radial and circumferential failure strains.
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Affiliation(s)
- Justin C Luo
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, 92697-2715, USA
- Beckman Laser Institute & Medical Clinic, University of California, Irvine, CA, 92697-2575, USA
- Department of Biomedical Engineering, Cornell University, Ithaca, NY, USA
| | - Herman Ching
- Department of Chemical and Biomolecular Engineering, University of California, Irvine, 916 Engineering Tower, Irvine, CA, 92697-2580, USA
| | - Bryce G Wilson
- Beckman Laser Institute & Medical Clinic, University of California, Irvine, CA, 92697-2575, USA
- Department of Chemical and Biomolecular Engineering, University of California, Irvine, 916 Engineering Tower, Irvine, CA, 92697-2580, USA
| | - Ali Mohraz
- Department of Chemical and Biomolecular Engineering, University of California, Irvine, 916 Engineering Tower, Irvine, CA, 92697-2580, USA
| | - Elliot L Botvinick
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, 92697-2715, USA
- Beckman Laser Institute & Medical Clinic, University of California, Irvine, CA, 92697-2575, USA
| | - Vasan Venugopalan
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, 92697-2715, USA.
- Beckman Laser Institute & Medical Clinic, University of California, Irvine, CA, 92697-2575, USA.
- Department of Chemical and Biomolecular Engineering, University of California, Irvine, 916 Engineering Tower, Irvine, CA, 92697-2580, USA.
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35
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Wang Y, Wang G, Xu D, Jiang B, Ge M, Wu L, Yang C, Mu N, Wang S, Chang C, Chen T, Feng H, Yao J. Terahertz spectroscopic diagnosis of early blast-induced traumatic brain injury in rats. BIOMEDICAL OPTICS EXPRESS 2020; 11:4085-4098. [PMID: 32923030 PMCID: PMC7449730 DOI: 10.1364/boe.395432] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 06/10/2020] [Accepted: 06/26/2020] [Indexed: 05/23/2023]
Abstract
The early diagnosis of blast-induced traumatic brain injury (bTBI) is of great clinical significance for prognostication and treatment. Here, we report a new strategy for early bTBI diagnosis through serum and cerebrospinal fluid (CSF) based on terahertz time-domain spectroscopy (THz-TDS). The spectral differences of serum and CSF for different degrees of experimental bTBI in rats have been demonstrated in the early period. In addition, the THz spectra of total protein in the hypothalamus and hippocampus were investigated at different time points after blast exposure, which both showed clear differences with time increasing compared with that in the normal brain. This might help to explain the neurological symptoms caused by bTBI. Moreover, based on the THz absorption spectra of serum and CSF, the principal component analysis and machine learning algorithms were performed to automatically identify the degree of bTBI. The highest diagnostic accuracy was up to 95.5%. It is suggested that this method has potential as an alternative method for high-sensitive, rapid, label-free, economical and early diagnosis of bTBI.
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Affiliation(s)
- Yuye Wang
- Institute of Laser and Optoelectronics, School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
- Key Laboratory of Optoelectronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
| | - Guoqiang Wang
- Institute of Laser and Optoelectronics, School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
- Key Laboratory of Optoelectronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
| | - Degang Xu
- Institute of Laser and Optoelectronics, School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
- Key Laboratory of Optoelectronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
| | - Bozhou Jiang
- Institute of Laser and Optoelectronics, School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
- Key Laboratory of Optoelectronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
| | - Meilan Ge
- Institute of Laser and Optoelectronics, School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
- Key Laboratory of Optoelectronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
| | - Limin Wu
- Institute of Laser and Optoelectronics, School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
- Key Laboratory of Optoelectronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
| | - Chuanyan Yang
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, China
| | - Ning Mu
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, China
| | - Shi Wang
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, China
| | - Chao Chang
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing, 100071, China
| | - Tunan Chen
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, China
| | - Hua Feng
- Department of Neurosurgery and Key Laboratory of Neurotrauma, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, China
| | - Jianquan Yao
- Institute of Laser and Optoelectronics, School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
- Key Laboratory of Optoelectronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
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Pringle C, Bailey M, Bukhari S, El-Sayed A, Hughes S, Josan V, Ramirez R, Kamaly-Asl I. Manchester Arena Attack: management of paediatric penetrating brain injuries. Br J Neurosurg 2020; 35:103-111. [PMID: 32677863 DOI: 10.1080/02688697.2020.1787339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE The Manchester Arena bombing on 22 May 2017 resulted in 22 deaths and over 160 casualties requiring medical attention. Given the threat of modern- era terrorist attacks in civilian environments, it is important that we are able to anticipate and appropriately manage neurological injuries associated with these events. This article describes our experience of managing paediatric neurosurgical blast injuries, from initial triage and operative management to longer-term considerations. MATERIALS AND METHODS Case study and literature review. RESULTS Paediatric traumatic and penetrating brain injury patients often make a good neurological recovery despite low GCS at time of injury; this should be accounted for during triage and operative decision making in major trauma, mass casualty events. Conservative management of retained shrapnel is advocated in view of low long-term infection rates with retained shrapnel and worsened neurological outcome with shrapnel retrieval. All penetrating brain injuries should receive a prolonged course of broad-spectrum antibiotics and undergo long term follow-up imaging to monitor for the development of cerebral abscesses. MRI should never be utilised in penetrating brain injury cases, even in the absence of macroscopically visible fragments, due to the effect of MRI ferromagnetic field torque on shrapnel fragments. Anti-epileptic drugs should only be prescribed for the initial seven days after injury, as continuing beyond this does not incur any benefit in the reduction of long term post-traumatic epilepsy. CONCLUSION All receiving neurosurgical units should become familiar with optimum management of these thankfully rare, but complex injuries from their initial presentation to long term follow up considerations. All neurosurgical units should have well-rehearsed local plans to follow in the event of such incidents, ensuring timely deliverance of appropriate neurosurgical care in such extreme settings.
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Affiliation(s)
- Catherine Pringle
- Department of Paediatric Neurosurgery, Royal Manchester Children's Hospital, Manchester, UK
| | - Matthew Bailey
- Department of Paediatric Neurosurgery, Royal Manchester Children's Hospital, Manchester, UK
| | - Shafqat Bukhari
- Department of Paediatric Neurosurgery, Royal Manchester Children's Hospital, Manchester, UK
| | - Ashraf El-Sayed
- Department of Paediatric Neurosurgery, Royal Manchester Children's Hospital, Manchester, UK
| | - Stephen Hughes
- Department of Microbiology and Immunology, Royal Manchester Children's Hospital, Manchester, UK
| | - Vivek Josan
- Department of Paediatric Neurosurgery, Royal Manchester Children's Hospital, Manchester, UK
| | - Roberto Ramirez
- Department of Paediatric Neurosurgery, Royal Manchester Children's Hospital, Manchester, UK
| | - Ian Kamaly-Asl
- Department of Paediatric Neurosurgery, Royal Manchester Children's Hospital, Manchester, UK
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Belding JN, Fitzmaurice S, Englert RM, Koenig HG, Thomsen CJ, Olaghere da Silva U. Self-Reported Concussion Symptomology during Deployment: Differences as a Function of Injury Mechanism and Low-Level Blast Exposure. J Neurotrauma 2020; 37:2219-2226. [PMID: 32368945 DOI: 10.1089/neu.2020.6997] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Traumatic brain injury (TBI), which can result from either direct impact to the head or blast exposure, has been the leading cause of morbidity and mortality in recent military conflicts. However, little research has compared mTBIs by mechanism of injury. The present research addressed two research questions: (1) Are blast-related mTBIs (mbTBIs) associated with significantly more symptoms than impact-related mTBIs (miTBIs), and (2) are mTBIs associated with more self-reported symptoms among service members with higher (vs. lower) risk of low-level blast (LLB) exposure. We obtained data from 181,423 active duty enlisted United States Marines deployed between 2003 and 2012, who completed the Post-Deployment Health Assessment. We examined the self-reported symptoms of Marines who completed an mTBI screen and could be classified as at high or low risk for LLB exposure, using their military occupation as a proxy (n = 12,013). Symptoms were compared as a function of blast exposure (blast vs. impact), probable mTBI (yes vs. no), occupational risk of LLB (high vs. low), and symptom type (neurological vs. musculoskeletal vs. immunological). Overall, musculoskeletal symptoms were reported more frequently than neurological and immunological symptoms. However, Marines with probable mTBIs (regardless of mechanism of injury) and those with probable mbTBIs specifically reported more neurological symptoms, which rose to the level of musculoskeletal symptom reporting. Among Marines with probable mTBI, those with high risk of LLB exposure also reported significantly more neurological symptoms. Our results indicate that mbTBIs and miTBIs may be fundamentally different, and that LLB may increase susceptibility to injury.
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Affiliation(s)
- Jennifer N Belding
- Leidos, San Diego, California, USA.,Naval Health Research Center, San Diego, California, USA
| | - Shannon Fitzmaurice
- Leidos, San Diego, California, USA.,Naval Health Research Center, San Diego, California, USA
| | - Robyn Martin Englert
- Leidos, San Diego, California, USA.,Naval Health Research Center, San Diego, California, USA
| | - Hannah G Koenig
- Leidos, San Diego, California, USA.,Naval Health Research Center, San Diego, California, USA
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38
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Mahmud KA, Hasan F, Khan MI, Adnan A. On the Molecular Level Cavitation in Soft Gelatin Hydrogel. Sci Rep 2020; 10:9635. [PMID: 32541847 PMCID: PMC7295970 DOI: 10.1038/s41598-020-66591-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 05/04/2020] [Indexed: 02/07/2023] Open
Abstract
We have studied the molecular level cavitation mechanisms and bubble growth kinetics in soft gelatin hydrogel and water. The apparent difference in cavitation threshold pressure between that generates in pure water and that in gelatin hydrogel is considered. Gelatin, which is derived from collagen, is frequently used as a brain simulant material. In liquid, cavitation bubble is created when surrounding pressure drops below the saturation vapor pressure. In principle, a cavitation bubble should continue to grow as long as tensile pressure continues to increase in the system. In our study, using molecular dynamics simulation, we have investigated the pressure requirement for a nanoscale cavitation to grow in water and gel. First, we have modeled a gel like structure with a preexisting bubble of 5 nm radius. A control model containing a 5 nm bubble in pure water is also created. Then, we have applied hydrostatic tensile pressure at two different expansion rates in the gel and water models. The results show that a gel-like structure requires higher pressure for the cavitation to grow, and both gel and water models exhibit strain rate effect on the cavitation threshold pressure. We have also found that the cavitation collapse time is dominated by the viscosity of the medium.
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Affiliation(s)
- Kah Al Mahmud
- Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, Texas, USA
| | - Fuad Hasan
- Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, Texas, USA
| | - Md Ishak Khan
- Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, Texas, USA
| | - Ashfaq Adnan
- Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, Texas, USA.
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39
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Papesh MA, Stefl AA, Gallun FJ, Billings CJ. Effects of Signal Type and Noise Background on Auditory Evoked Potential N1, P2, and P3 Measurements in Blast-Exposed Veterans. Ear Hear 2020; 42:106-121. [PMID: 32520849 DOI: 10.1097/aud.0000000000000906] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES Veterans who have been exposed to high-intensity blast waves frequently report persistent auditory difficulties such as problems with speech-in-noise (SIN) understanding, even when hearing sensitivity remains normal. However, these subjective reports have proven challenging to corroborate objectively. Here, we sought to determine whether use of complex stimuli and challenging signal contrasts in auditory evoked potential (AEP) paradigms rather than traditional use of simple stimuli and easy signal contrasts improved the ability of these measures to (1) distinguish between blast-exposed Veterans with auditory complaints and neurologically normal control participants, and (2) predict behavioral measures of SIN perception. DESIGN A total of 33 adults (aged 19-56 years) took part in this study, including 17 Veterans exposed to high-intensity blast waves within the past 10 years and 16 neurologically normal control participants matched for age and hearing status with the Veteran participants. All participants completed the following test measures: (1) a questionnaire probing perceived hearing abilities; (2) behavioral measures of SIN understanding including the BKB-SIN, the AzBio presented in 0 and +5 dB signal to noise ratios (SNRs), and a word-level consonant-vowel-consonant test presented at +5 dB SNR; and (3) electrophysiological tasks involving oddball paradigms in response to simple tones (500 Hz standard, 1000 Hz deviant) and complex speech syllables (/ba/ standard, /da/ deviant) presented in quiet and in four-talker speech babble at a SNR of +5 dB. RESULTS Blast-exposed Veterans reported significantly greater auditory difficulties compared to control participants. Behavioral performance on tests of SIN perception was generally, but not significantly, poorer among the groups. Latencies of P3 responses to tone signals were significantly longer among blast-exposed participants compared to control participants regardless of background condition, though responses to speech signals were similar across groups. For cortical AEPs, no significant interactions were found between group membership and either stimulus type or background. P3 amplitudes measured in response to signals in background babble accounted for 30.9% of the variance in subjective auditory reports. Behavioral SIN performance was best predicted by a combination of N1 and P2 responses to signals in quiet which accounted for 69.6% and 57.4% of the variance on the AzBio at 0 dB SNR and the BKB-SIN, respectively. CONCLUSIONS Although blast-exposed participants reported far more auditory difficulties compared to controls, use of complex stimuli and challenging signal contrasts in cortical and cognitive AEP measures failed to reveal larger group differences than responses to simple stimuli and easy signal contrasts. Despite this, only P3 responses to signals presented in background babble were predictive of subjective auditory complaints. In contrast, cortical N1 and P2 responses were predictive of behavioral SIN performance but not subjective auditory complaints, and use of challenging background babble generally did not improve performance predictions. These results suggest that challenging stimulus protocols are more likely to tap into perceived auditory deficits, but may not be beneficial for predicting performance on clinical measures of SIN understanding. Finally, these results should be interpreted with caution since blast-exposed participants did not perform significantly poorer on tests of SIN perception.
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Affiliation(s)
- Melissa A Papesh
- National Center for Rehabilitative Auditory Research, VA Portland Health Care System, Portland, Oregon, USA.,Department of Otolaryngology Head and Neck Surgery, Oregon Health & Science University, Portland, Oregon, USA
| | - Alyssa A Stefl
- National Center for Rehabilitative Auditory Research, VA Portland Health Care System, Portland, Oregon, USA
| | - Frederick J Gallun
- National Center for Rehabilitative Auditory Research, VA Portland Health Care System, Portland, Oregon, USA.,Department of Otolaryngology Head and Neck Surgery, Oregon Health & Science University, Portland, Oregon, USA.,Department of Neurology, Oregon Health & Science University, Portland, Oregon, USA
| | - Curtis J Billings
- National Center for Rehabilitative Auditory Research, VA Portland Health Care System, Portland, Oregon, USA.,Department of Otolaryngology Head and Neck Surgery, Oregon Health & Science University, Portland, Oregon, USA
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Venkatasubramanian PN, Keni P, Gastfield R, Li L, Aksenov D, Sherman SA, Bailes J, Sindelar B, Finan JD, Lee J, Bailes JE, Wyrwicz AM. Diffusion Tensor Imaging Detects Acute and Subacute Changes in Corpus Callosum in Blast-Induced Traumatic Brain Injury. ASN Neuro 2020; 12:1759091420922929. [PMID: 32403948 PMCID: PMC7238783 DOI: 10.1177/1759091420922929] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
There is a critical need for understanding the progression of neuropathology in blast-induced traumatic brain injury using valid animal models to develop diagnostic approaches. In the present study, we used diffusion imaging and magnetic resonance (MR) morphometry to characterize axonal injury in white matter structures of the rat brain following a blast applied via blast tube to one side of the brain. Diffusion tensor imaging was performed on acute and subacute phases of pathology from which fractional anisotropy, mean diffusivity, axial diffusivity, and radial diffusivity were calculated for corpus callosum (CC), cingulum bundle, and fimbria. Ventricular volume and CC thickness were measured. Blast-injured rats showed temporally varying bilateral changes in diffusion metrics indicating persistent axonal pathology. Diffusion changes in the CC suggested vasogenic edema secondary to axonal injury in the acute phase. Axonal pathology persisted in the subacute phase marked by cytotoxic edema and demyelination which was confirmed by ultrastructural analysis. The evolution of pathology followed a different pattern in the cingulum bundle: axonal injury and demyelination in the acute phase followed by cytotoxic edema in the subacute phase. Spatially, structures close to midline were most affected. Changes in the genu were greater than in the body and splenium; the caudal cingulum bundle was more affected than the rostral cingulum. Thinning of CC and ventriculomegaly were greater only in the acute phase. Our results reveal the persistent nature of blast-induced axonal pathology and suggest that diffusion imaging may have potential for detecting the temporal evolution of blast injury.
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Affiliation(s)
- Palamadai N Venkatasubramanian
- Center for Basic M.R. Research, Department of Radiology, NorthShore University HealthSystem, Evanston, Illinois, United States
| | - Prachi Keni
- Department of Neurosurgery, NorthShore University HealthSystem, Evanston, Illinois, United States
| | - Roland Gastfield
- Center for Basic M.R. Research, Department of Radiology, NorthShore University HealthSystem, Evanston, Illinois, United States
| | - Limin Li
- Center for Basic M.R. Research, Department of Radiology, NorthShore University HealthSystem, Evanston, Illinois, United States
| | - Daniil Aksenov
- Center for Basic M.R. Research, Department of Radiology, NorthShore University HealthSystem, Evanston, Illinois, United States
| | - Sydney A Sherman
- Department of Neurosurgery, NorthShore University HealthSystem, Evanston, Illinois, United States
| | - Julian Bailes
- Department of Neurosurgery, NorthShore University HealthSystem, Evanston, Illinois, United States
| | - Brian Sindelar
- Department of Neurosurgery, NorthShore University HealthSystem, Evanston, Illinois, United States
| | - John D Finan
- Department of Neurosurgery, NorthShore University HealthSystem, Evanston, Illinois, United States
| | - John Lee
- Department of Pathology, NorthShore University HealthSystem, Evanston, Illinois, United States
| | - Julian E Bailes
- Department of Neurosurgery, NorthShore University HealthSystem, Evanston, Illinois, United States
| | - Alice M Wyrwicz
- Center for Basic M.R. Research, Department of Radiology, NorthShore University HealthSystem, Evanston, Illinois, United States
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Cavitation-induced traumatic cerebral contusion and intracerebral hemorrhage in the rat brain by using an off-the-shelf clinical shockwave device. Sci Rep 2019; 9:15614. [PMID: 31666607 PMCID: PMC6821893 DOI: 10.1038/s41598-019-52117-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 10/09/2019] [Indexed: 12/20/2022] Open
Abstract
Traumatic cerebral contusion and intracerebral hemorrhages (ICH) commonly result from traumatic brain injury and are associated with high morbidity and mortality rates. Current animal models require craniotomy and provide less control over injury severity. This study proposes a highly reproducible and controllable traumatic contusion and ICH model using non-invasive extracorporeal shockwaves (ESWs). Rat heads were exposed to ESWs generated by an off-the-shelf clinical device plus intravenous injection of microbubbles to enhance the cavitation effect for non-invasive induction of injury. Results indicate that injury severity can be effectively adjusted by using different ESW parameters. Moreover, the location or depth of injury can be purposefully determined by changing the focus of the concave ESW probe. Traumatic contusion and ICH were confirmed by H&E staining. Interestingly, the numbers of TUNEL-positive cells (apoptotic cell death) peaked one day after ESW exposure, while Iba1-positive cells (reactive microglia) and GFAP-positive cells (astrogliosis) respectively peaked seven and fourteen days after exposure. Cytokine assay showed significantly increased expressions of IL-1β, IL-6, and TNF-α. The extent of brain edema was characterized with magnetic resonance imaging. Conclusively, the proposed non-invasive and highly reproducible preclinical model effectively simulates the mechanism of closed head injury and provides focused traumatic contusion and ICH.
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42
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Ravin R, Morgan NY, Blank PS, Ravin N, Guerrero-Cazares H, Quinones-Hinojosa A, Zimmerberg J. Response to Blast-like Shear Stresses Associated with Mild Blast-Induced Brain Injury. Biophys J 2019; 117:1167-1178. [PMID: 31495447 PMCID: PMC6818442 DOI: 10.1016/j.bpj.2019.07.052] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 06/12/2019] [Accepted: 07/24/2019] [Indexed: 12/27/2022] Open
Abstract
Toward the goal of understanding the pathophysiology of mild blast-induced traumatic brain injury and identifying the physical forces associated with the primary injury phase, we developed a system that couples a pneumatic blast to a microfluidic channel to precisely and reproducibly deliver shear transients to dissociated human central nervous system (CNS) cells, on a timescale comparable to an explosive blast but with minimal pressure transients. Using fluorescent beads, we have characterized the shear transients experienced by the cells and demonstrate that the system is capable of accurately and reproducibly delivering uniform shear transients with minimal pressure across the cell culture volume. This system is compatible with high-resolution, time-lapse optical microscopy. Using this system, we demonstrate that blast-like shear transients produced with minimal pressure transients and submillisecond rise times activate calcium responses in dissociated human CNS cultures. Cells respond with increased cytosolic free calcium to a threshold shear stress between 8 and 21 Pa; the propagation of this calcium response is a result of purinergic signaling. We propose that this system models, in vitro, the fundamental injury wave produced by shear forces consequent to blast shock waves passing through density inhomogeneity in human CNS cells.
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Affiliation(s)
- Rea Ravin
- Celoptics, Inc., Rockville, Maryland
| | - Nicole Y Morgan
- National Institute of Biomedical Imaging and Bioengineering, Bethesda, Maryland
| | - Paul S Blank
- Section on Integrative Biophysics, Division of Basic and Translational Biophysics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland
| | | | | | | | - Joshua Zimmerberg
- Section on Integrative Biophysics, Division of Basic and Translational Biophysics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland.
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Miansari M, Mehta MD, Schilling JM, Kurashina Y, Patel HH, Friend J. Inducing Mild Traumatic Brain Injury in C. elegans via Cavitation-Free Surface Acoustic Wave-Driven Ultrasonic Irradiation. Sci Rep 2019; 9:12775. [PMID: 31485018 PMCID: PMC6726767 DOI: 10.1038/s41598-019-47295-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Accepted: 07/15/2019] [Indexed: 12/13/2022] Open
Abstract
Mild traumatic brain injury is an all-too-common outcome from modern warfare and sport, and lacks a reproducible model for assessment of potential treatments and protection against it. Here we consider the use of surface acoustic wave (SAW) irradiation of C. elegans worms—without cavitation—as a potential, ethically reasonable animal-on-a-chip model for inducing traumatic brain injury in an animal, producing significant effects on memory and learning that could prove useful in a model that progress from youth to old age in but a few weeks. We show a significant effect by SAW on the ability of worms to learn post-exposure through associative learning chemotaxis. At higher SAW intensity, we find immediate, thorough, but temporary paralysis of the worms. We further explore the importance of homogeneous exposure of the worms to the SAW-driven ultrasound, an aspect poorly controlled in past efforts, if at all, and demonstrate the absence of cavitation through a change in fluids from a standard media for the worms to the exceedingly viscous polyvinyl alcohol. Likewise, we demonstrate that acoustic streaming, when present, is not directly responsible for paralysis nor learning disabilities induced in the worm, but is beneficial at low amplitudes to ensuring homogeneous ultrasound exposure.
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Affiliation(s)
- Morteza Miansari
- Medically Advanced Devices Laboratory, Center for Medical Devices, Department of Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Drive MC0411, La Jolla, 92093, CA, United States of America.,Department of Mechanical Engineering, Babol Noshirvani University of Technology, P.O. Box 484, Babol, Iran.,Department of Cancer Medicine, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Babol, Iran
| | - Meghna D Mehta
- Department of Anesthesiology, University of California San Diego, 9500 Gilman Dr MC0801, La Jolla, 92093, California, USA
| | - Jan M Schilling
- Department of Anesthesiology, University of California San Diego, 9500 Gilman Dr MC0801, La Jolla, 92093, California, USA
| | - Yuta Kurashina
- Medically Advanced Devices Laboratory, Center for Medical Devices, Department of Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Drive MC0411, La Jolla, 92093, CA, United States of America.,School of Materials and Chemical Technology, Tokyo Institute of Technology, Nagatsuta, Yokohama, 4259, Japan
| | - Hemal H Patel
- Department of Anesthesiology, University of California San Diego, 9500 Gilman Dr MC0801, La Jolla, 92093, California, USA
| | - James Friend
- Medically Advanced Devices Laboratory, Center for Medical Devices, Department of Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Drive MC0411, La Jolla, 92093, CA, United States of America.
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44
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McCarty AK, Zhang L, Hansen S, Jackson WJ, Bentil SA. Viscoelastic properties of shock wave exposed brain tissue subjected to unconfined compression experiments. J Mech Behav Biomed Mater 2019; 100:103380. [PMID: 31446342 DOI: 10.1016/j.jmbbm.2019.103380] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 07/26/2019] [Accepted: 07/27/2019] [Indexed: 12/15/2022]
Abstract
Traumatic brain injuries (TBI) affect millions of people each year. While research has been dedicated to determining the mechanical properties of the uninjured brain, there has been a lack of investigation on the mechanical properties of the brain after experiencing a primary blast-induced TBI. In this paper, whole porcine brains were exposed to a shock wave to simulate blast-induced TBI. First, ten (10) brains were subjected to unconfined compression experiments immediately following shock wave exposure. In addition, 22 brains exposed to a shock wave were placed in saline solution and refrigerated between 30 minutes and 6.0 hours before undergoing unconfined compression experiments. This study aimed to investigate the effect of a time delay on the viscoelastic properties in the event that an experiment cannot be completed immediately. Samples from both soaked and freshly extracted brains were subjected to compressive rates of 5, 50, and 500 mm/min during the unconfined compression experiments. The fractional Zener (FZ) viscoelastic model was applied to obtain the brain's material properties. The length of time in the solution statistically influenced three of the four FZ coefficients, E0 (instantaneous elastic response), τ0 (relaxation time), and α (fractional order). Further, the compressive rate statistically influenced τ0 and α.
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Affiliation(s)
- Annastacia K McCarty
- Department of Mechanical Engineering, Iowa State University of Science and Technology, 2529 Union Drive, Ames, IA, 50011, USA
| | - Ling Zhang
- Department of Mechanical Engineering, Iowa State University of Science and Technology, 2529 Union Drive, Ames, IA, 50011, USA
| | - Sarah Hansen
- Department of Mechanical Engineering, Iowa State University of Science and Technology, 2529 Union Drive, Ames, IA, 50011, USA
| | - William J Jackson
- Department of Mechanical Engineering, Iowa State University of Science and Technology, 2529 Union Drive, Ames, IA, 50011, USA
| | - Sarah A Bentil
- Department of Mechanical Engineering, Iowa State University of Science and Technology, 2529 Union Drive, Ames, IA, 50011, USA.
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45
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The effect of blast overpressure on the mechanical properties of the human tympanic membrane. J Mech Behav Biomed Mater 2019; 100:103368. [PMID: 31473437 DOI: 10.1016/j.jmbbm.2019.07.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 06/14/2019] [Accepted: 07/22/2019] [Indexed: 11/21/2022]
Abstract
The rupture of the tympanic membrane (TM) is one of the major indicators for blast injuries due to the vulnerability of TM under exposure to blast overpressure. The mechanical properties of the human TM exhibit a significant change after it is exposed to such a high intensity blast. To date, the published data were obtained from measurement on TM strips cut from a TM following an exposure to blast overpressure. The dissection of a TM for preparation of strip samples can induce secondary damage to the TM and thus potentially lead to data not representative of the blast damage. In this paper, we conduct mechanical testing on the full TM in a human temporal bone. A bulging experiment on the entire TM is carried out on each sample prepared from a temporal bone following the exposure to blast three times at a pressure level slightly below the TM rupture threshold. Using a micro-fringe projection method, the volume displacement is obtained as a function of pressure, and their relationship is modeled in the finite element analysis to determine the mechanical properties of the post-blast human TMs, the results of which are compared with the control TMs without an exposure to the blast. It is found that Young's modulus of human TM decreases by approximately 20% after exposure to multiple blast waves. The results can be used in the human ear simulation models to assist the understanding of the effect of blast overpressure on hearing loss.
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Uddin O, Studlack PE, Parihar S, Keledjian K, Cruz A, Farooq T, Shin N, Gerzanich V, Simard JM, Keller A. Chronic pain after blast-induced traumatic brain injury in awake rats. NEUROBIOLOGY OF PAIN (CAMBRIDGE, MASS.) 2019; 6:100030. [PMID: 31223145 PMCID: PMC6565615 DOI: 10.1016/j.ynpai.2019.100030] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 02/14/2019] [Accepted: 04/01/2019] [Indexed: 12/14/2022]
Abstract
Explosive blast-induced traumatic brain injury (blast-TBI) in military personnel is a leading cause of injury and persistent neurological abnormalities, including chronic pain. We previously demonstrated that chronic pain after spinal cord injury results from central sensitization in the posterior thalamus (PO). The presence of persistent headaches and back pain in veterans with blast-TBI suggests a similar involvement of thalamic sensitization. Here, we tested the hypothesis that pain after blast-TBI is associated with abnormal increases in activity of neurons in PO thalamus. We developed a novel model with two unique features: (1) blast-TBI was performed in awake, un-anesthetized rats, to simulate the human experience and to eliminate confounds of anesthesia and surgery inherent in other models; (2) only the cranium, rather than the entire body, was exposed to a collimated blast wave, with the blast wave striking the posterior cranium in the region of the occipital crest and foramen magnum. Three weeks after blast-TBI, rats developed persistent, ongoing spontaneous pain. Contrary to our hypothesis, we found no significant differences in the activity of PO neurons, or of neurons in the spinal trigeminal nucleus. There were also no significant changes in gliosis in either of these structures. This novel model will allow future studies on the pathophysiology of chronic pain after blast-TBI.
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Affiliation(s)
- Olivia Uddin
- Department of Anatomy and Neurobiology and Program in Neuroscience, University of Maryland School of Medicine, 20 Penn St, HSF-II S251, Baltimore, MD, USA
| | - Paige E. Studlack
- Department of Anatomy and Neurobiology and Program in Neuroscience, University of Maryland School of Medicine, 20 Penn St, HSF-II S251, Baltimore, MD, USA
| | - Saitu Parihar
- Department of Anatomy and Neurobiology and Program in Neuroscience, University of Maryland School of Medicine, 20 Penn St, HSF-II S251, Baltimore, MD, USA
| | - Kaspar Keledjian
- Department of Neurosurgery, University of Maryland School of Medicine, 10 S Pine St, MSTF 634B, Baltimore, MD, USA
| | - Alexis Cruz
- Department of Anatomy and Neurobiology and Program in Neuroscience, University of Maryland School of Medicine, 20 Penn St, HSF-II S251, Baltimore, MD, USA
| | - Tayyiaba Farooq
- Department of Anatomy and Neurobiology and Program in Neuroscience, University of Maryland School of Medicine, 20 Penn St, HSF-II S251, Baltimore, MD, USA
| | - Naomi Shin
- Department of Anatomy and Neurobiology and Program in Neuroscience, University of Maryland School of Medicine, 20 Penn St, HSF-II S251, Baltimore, MD, USA
| | - Volodymyr Gerzanich
- Department of Neurosurgery, University of Maryland School of Medicine, 10 S Pine St, MSTF 634B, Baltimore, MD, USA
| | - J. Marc Simard
- Department of Neurosurgery, University of Maryland School of Medicine, 10 S Pine St, MSTF 634B, Baltimore, MD, USA
- Department of Pathology, University of Maryland School of Medicine, 10 S Pine St, MSTF, Room 634B, Baltimore, MD, USA
- Department of Physiology, University of Maryland School of Medicine, 10 S Pine St, MSTF, Room 634B, Baltimore, MD, USA
| | - Asaf Keller
- Department of Anatomy and Neurobiology and Program in Neuroscience, University of Maryland School of Medicine, 20 Penn St, HSF-II S251, Baltimore, MD, USA
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Haran FJ, Handy JD, Servatius RJ, Rhea CK, Tsao JW. Acute neurocognitive deficits in active duty service members following subconcussive blast exposure. APPLIED NEUROPSYCHOLOGY-ADULT 2019; 28:297-309. [PMID: 31269805 DOI: 10.1080/23279095.2019.1630627] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Military service members are frequently subjected to subconcussive blast events during training and deployment. Emerging evidence suggests blast exposures of these magnitudes may have long-term consequences for dimensions of cognitive function. Less is known about cognitive sequelae acutely following deployment-related subconcussive blast events. The current study addressed this knowledge gap by assessing the extent to which subconcussive blast exposure affected performance on the Automated Neuropsychological Assessment Metrics 4 TBI-MIL (ANAM). Baseline-referenced and normative comparisons of archival ANAM data were analyzed for a cohort of personnel who were exposed to blast (blast group; n = 27) and personnel who were not exposed to blast (no-blast group; n = 36) that were otherwise asymptomatic for a concussion. The blast group exhibited statistically significant lower scores compared to the no-blast group (between-subjects), baseline assessments (within-subjects), and an age-matched normative population. Normative comparisons revealed that the scores for the reaction time subtests (i.e., procedural and both simple reaction time tasks) were outside the range of normal functioning (1 SD) and reliable change indices revealed clinically meaningful change only for simple reaction time. The results highlight covert effects of subconcussive blast exposure that may warrant further monitoring in the immediate aftermath of a blast event.
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Affiliation(s)
- F J Haran
- Neurotrauma Department, Naval Medical Research Center, Silver Spring, Maryland, USA.,Department of Psychiatry, Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA.,Department of Kinesiology, University of North Carolina at Greensboro, Greensboro, North Carolina, USA
| | - Justin D Handy
- Stress and Motivated Behavior Institute, Syracuse, New York, USA
| | - Richard J Servatius
- Stress and Motivated Behavior Institute, Syracuse, New York, USA.,Research & Development, Syracuse VA Medical Center, Syracuse, New York, USA.,Department of Psychiatry, State University of New York Upstate Medical University, Syracuse, New York, USA
| | - Christopher K Rhea
- Department of Kinesiology, University of North Carolina at Greensboro, Greensboro, North Carolina, USA
| | - Jack W Tsao
- Department of Neurology, University of Tennessee Health Science Center, Memphis, Tennessee, USA.,Children's Foundation Research Institute, Le Bonheur Children's Hospital, Memphis, Tennessee, USA.,Department of Neurology, Memphis Veterans Affairs Medical Center, Memphis, Tennessee, USA
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48
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Lee J, Lau VM, Ren Y, Evans CM, Moore JS, Sottos NR. Effect of Polymerized Ionic Liquid Structure and Morphology on Shockwave Energy Dissipation. ACS Macro Lett 2019; 8:535-539. [PMID: 35619357 DOI: 10.1021/acsmacrolett.9b00133] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The ability of nanosegregated polymerized ionic liquids (PILs) to dissipate shockwave energy is investigated for a series of imidazolium-based PILs with varying alkyl spacer length. The PILs are designed to have similar glass transition temperatures but different structures. X-ray scattering analysis reveals that each of the amorphous PILs exhibit distinct nanoscale structural heterogeneity, depending on the length of the chain spacer. We find that a higher structural heterogeneity, determined from the intensity of the intercluster scattering peak, in the PILs with longer alkyl spacers results in greater shockwave energy dissipation. In addition, we observe the crystalline phase is less effective at dissipating shockwave energy than the amorphous phase due to the close packed morphology and slow kinetics.
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49
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Zhang L, Jackson WJ, Bentil SA. The mechanical behavior of brain surrogates manufactured from silicone elastomers. J Mech Behav Biomed Mater 2019; 95:180-190. [PMID: 31009902 DOI: 10.1016/j.jmbbm.2019.04.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 03/03/2019] [Accepted: 04/05/2019] [Indexed: 01/05/2023]
Abstract
The ongoing conflict against terrorism has resulted in an escalation of blast-induced traumatic brain injuries (bTBI) caused by improvised explosive devices (IEDs). The destructive IEDs create a blast wave that travels through the atmosphere. Blast-induced traumatic brain injuries, attributed to the blast wave, can cause life-threatening injuries and fatalities. This study aims to find a surrogate brain material for assessing the effectiveness of head protection systems designed to mitigate bTBI. Polydimethylsiloxane (PDMS) is considered as the surrogate brain material. The stiffness of PDMS (Sylgard 184, Dow Corning Corp.) can be controlled by varying the ratio of base and curing agent. Cylindrical PDMS specimen with ratios of 1:10, 1:70, and 1:80 were subjected to unconfined compression experiments at linear rates of 5 mm/min, 50 mm/min, and 500 mm/min. A ramp-hold strain profile was used to simulate a stress relaxation experiment. The fractional Zener viscoelastic model was used to describe the stress relaxation response, after optimization of the material constants for the brain surrogate and shock wave exposure brain tissue. The results show that the low cost PDMS can be used as a surrogate brain material to study the dynamic brain response to blast wave exposure.
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Affiliation(s)
- Ling Zhang
- Department of Mechanical Engineering, Iowa State University of Science and Technology, 2529 Union Drive, Ames, IA, 50011, USA
| | - William J Jackson
- Department of Mechanical Engineering, Iowa State University of Science and Technology, 2529 Union Drive, Ames, IA, 50011, USA
| | - Sarah A Bentil
- Department of Mechanical Engineering, Iowa State University of Science and Technology, 2529 Union Drive, Ames, IA, 50011, USA.
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50
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Vázquez-Rosa E, Watson MR, Sahn JJ, Hodges TR, Schroeder RE, Cintrón-Pérez CJ, Shin MK, Yin TC, Emery JL, Martin SF, Liebl DJ, Pieper AA. Neuroprotective Efficacy of a Sigma 2 Receptor/TMEM97 Modulator (DKR-1677) after Traumatic Brain Injury. ACS Chem Neurosci 2019; 10:1595-1602. [PMID: 30421909 DOI: 10.1021/acschemneuro.8b00543] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Compounds targeting the sigma 2 receptor, which we recently cloned and showed to be identical with transmembrane protein 97 (σ2R/TMEM97), are broadly applicable therapeutic agents currently in clinical trials for imaging in breast cancer and for treatment of Alzheimer's disease and schizophrenia. These promising applications coupled with our previous observation that the σ2R/TMEM97 modulator SAS-0132 has neuroprotective attributes and improves cognition in wild-type mice suggests that modulating σ2R/TMEM97 may also have therapeutic benefits in other neurodegenerative conditions such as traumatic brain injury (TBI). Herein, we report that DKR-1677, a novel derivative of SAS-0132 with increased affinity and selectivity for σ2R/Tmem97 ( Ki = 5.1 nM), is neuroprotective after blast-induced and controlled cortical impact (CCI) TBI in mice. Specifically, we discovered that treatment with DKR-1677 decreases axonal degeneration after blast-induced TBI and enhances survival of cortical neurons and oligodendrocytes after CCI injury. Furthermore, treatment with DKR-1677 preserves cognition in the Morris water maze after blast TBI. Our results support an increasingly broad role for σ2R/Tmem97 modulation in neuroprotection and suggest a new approach for treating patients suffering from TBI.
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Affiliation(s)
- Edwin Vázquez-Rosa
- Department of Psychiatry and Department of Free Radical, Radiation Biology Program, Holden Comprehensive Cancer Center, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242, United States
- Department of Psychiatry Case Western Reserve University, Geriatric Research Education and Clinical Centers, Harrington Discovery Institute, University Hospital, Case Medical Center, Louis Stokes Cleveland VAMC, Cleveland, Ohio 44106, United States
| | - Michael R. Watson
- The Miami Project to Cure Paralysis, Department of Neurological Surgery, University of Miami Miller School of Medicine, Miami, Florida 33136, United States
| | - James J. Sahn
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Timothy R. Hodges
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Rachel E. Schroeder
- Department of Psychiatry and Department of Free Radical, Radiation Biology Program, Holden Comprehensive Cancer Center, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242, United States
| | - Coral J. Cintrón-Pérez
- Department of Psychiatry Case Western Reserve University, Geriatric Research Education and Clinical Centers, Harrington Discovery Institute, University Hospital, Case Medical Center, Louis Stokes Cleveland VAMC, Cleveland, Ohio 44106, United States
| | - Min-Kyoo Shin
- Department of Psychiatry Case Western Reserve University, Geriatric Research Education and Clinical Centers, Harrington Discovery Institute, University Hospital, Case Medical Center, Louis Stokes Cleveland VAMC, Cleveland, Ohio 44106, United States
| | - Terry C. Yin
- Department of Psychiatry and Department of Free Radical, Radiation Biology Program, Holden Comprehensive Cancer Center, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242, United States
| | - Josie L. Emery
- Department of Psychiatry and Department of Free Radical, Radiation Biology Program, Holden Comprehensive Cancer Center, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242, United States
| | - Stephen F. Martin
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Daniel J. Liebl
- The Miami Project to Cure Paralysis, Department of Neurological Surgery, University of Miami Miller School of Medicine, Miami, Florida 33136, United States
| | - Andrew A. Pieper
- Department of Psychiatry and Department of Free Radical, Radiation Biology Program, Holden Comprehensive Cancer Center, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242, United States
- Department of Psychiatry Case Western Reserve University, Geriatric Research Education and Clinical Centers, Harrington Discovery Institute, University Hospital, Case Medical Center, Louis Stokes Cleveland VAMC, Cleveland, Ohio 44106, United States
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