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Zhao Q, Zhang J, Li H, Li H, Xie F. Models of traumatic brain injury-highlights and drawbacks. Front Neurol 2023; 14:1151660. [PMID: 37396767 PMCID: PMC10309005 DOI: 10.3389/fneur.2023.1151660] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 05/26/2023] [Indexed: 07/04/2023] Open
Abstract
Traumatic brain injury (TBI) is the leading cause for high morbidity and mortality rates in young adults, survivors may suffer from long-term physical, cognitive, and/or psychological disorders. Establishing better models of TBI would further our understanding of the pathophysiology of TBI and develop new potential treatments. A multitude of animal TBI models have been used to replicate the various aspects of human TBI. Although numerous experimental neuroprotective strategies were identified to be effective in animal models, a majority of strategies have failed in phase II or phase III clinical trials. This failure in clinical translation highlights the necessity of revisiting the current status of animal models of TBI and therapeutic strategies. In this review, we elucidate approaches for the generation of animal models and cell models of TBI and summarize their strengths and limitations with the aim of exploring clinically meaningful neuroprotective strategies.
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Affiliation(s)
- Qinghui Zhao
- Institute of Physical Culture, Huanghuai University, Zhumadian, China
| | - Jianhua Zhang
- Institute of Physical Culture, Huanghuai University, Zhumadian, China
| | - Huige Li
- Institute of Physical Culture, Huanghuai University, Zhumadian, China
| | - Hongru Li
- Zhumadian Central Hospital, Zhumadian, China
| | - Fei Xie
- Faculty of Environment and Life, Beijing University of Technology, Beijing, China
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2
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Luo RH, Tram NK, Parekh AM, Puri R, Reilly MA, Swindle-Reilly KE. The Roles of Vitreous Biomechanics in Ocular Disease, Biomolecule Transport, and Pharmacokinetics. Curr Eye Res 2023; 48:195-207. [PMID: 35179421 DOI: 10.1080/02713683.2022.2033271] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
PURPOSE The biomechanical properties of the vitreous humor and replication of these properties to develop substitutes for the vitreous humor have rapidly become topics of interest over the last two decades. In particular, the behavior of the vitreous humor as a viscoelastic tissue has been investigated to identify its role in a variety of processes related to biotransport, aging, and age-related pathologies of the vitreoretinal interface. METHODS A thorough search and review of peer-reviewed publications discussing the biomechanical properties of the vitreous humor in both human and animal specimens was conducted. Findings on the effects of biomechanics on vitreoretinal pathologies and vitreous biotransport were analyzed and discussed. RESULTS The pig and rabbit vitreous have been found to be most mechanically similar to the human vitreous. Age-related liquefaction of the vitreous creates two mechanically unique phases, with an overall effect of softening the vitreous. However, the techniques used to acquire this mechanical data are limited by the in vitro testing methods used, and the vitreous humor has been hypothesized to behave differently in vivo due in part to its swelling properties. The impact of liquefaction and subsequent detachment of the vitreous humor from the posterior retinal surface is implicated in a variety of tractional pathologies of the retina and macula. Liquefaction also causes significant changes in the biotransport properties of the eye, allowing for significantly faster movement of molecules compared to the healthy vitreous. Recent developments in computational and ex vivo models of the vitreous humor have helped with understanding its behavior and developing materials capable of replacing it. CONCLUSIONS A better understanding of the biomechanical properties of the vitreous humor and how these relate to its structure will potentially aid in improving clinical metrics for vitreous liquefaction, design of biomimetic vitreous substitutes, and predicting pharmacokinetics for intravitreal drug delivery.
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Affiliation(s)
- Richard H Luo
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
| | - Nguyen K Tram
- Center for Regenerative Medicine, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA
| | - Ankur M Parekh
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, USA
| | - Raima Puri
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
| | - Matthew A Reilly
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA.,Department of Ophthalmology and Visual Sciences, The Ohio State University, Columbus, OH, USA
| | - Katelyn E Swindle-Reilly
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA.,William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, USA.,Department of Ophthalmology and Visual Sciences, The Ohio State University, Columbus, OH, USA
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3
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Klimo KR, Stern-Green EA, Shelton E, Day E, Jordan L, Robich M, Racine J, McDaniel CE, VanNasdale DA, Yuhas PT. Structure and function of retinal ganglion cells in subjects with a history of repeated traumatic brain injury. Front Neurol 2022; 13:963587. [PMID: 36034275 PMCID: PMC9412167 DOI: 10.3389/fneur.2022.963587] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 07/22/2022] [Indexed: 01/21/2023] Open
Abstract
This study tested whether repeated traumatic brain injuries (TBIs) alter the objective structure or the objective function of retinal ganglion cells (RGCs) in human subjects recruited from an optometry clinic. Case subjects (n = 25) with a history of repeated TBIs (4.12 ± 2.76 TBIs over 0-41 years) and healthy pair-matched control subjects (n = 30) were prospectively recruited. Retinal nerve fiber layer (RNFL) thickness was quantified with spectral-domain optical coherence tomography, and scanning laser polarimetry measured RNFL phase retardation. Measurements of the photopic negative response were made using full-field flash electroretinography. There was no statistically significant difference (p = 0.42) in global RNFL thickness between the case cohort (96.6 ± 9.4 microns) and the control cohort (94.9 ± 7.0 microns). There was no statistically significant difference (p = 0.80) in global RNFL phase retardation between the case cohort (57.9 ± 5.7 nm) and the control cohort (58.2 ± 4.6 nm). There were no statistically significant differences in the peak time (p = 0.95) of the PhNR or in the amplitude (p = 0.11) of the PhNR between the case cohort (69.9 ± 6.9 ms and 24.1 ± 5.1 μV, respectively) and the control cohort (70.1 ± 8.9 ms and 27.8 ± 9.1 μV, respectively). However, PhNR amplitude was more variable (p < 0.025) in the control cohort than in the case cohort. Within the case cohort, there was a strong positive (r = 0.53), but not statistically significant (p = 0.02), association between time since last TBI and PhNR amplitude. There was also a modest positive (r = 0.45), but not statistically significant (p = 0.04), association between time since first TBI and PhNR amplitude. Our results suggest that there were no statistically significant differences in the objective structure or in the objective function of RGCs between the case cohort and the control cohort. Future large, longitudinal studies will be necessary to confirm our negative results and to more fully investigate the potential interaction between PhNR amplitude and time since first or last TBI.
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Affiliation(s)
- Kelly R. Klimo
- College of Optometry, The Ohio State University, Columbus, OH, United States
| | | | - Erica Shelton
- College of Optometry, The Ohio State University, Columbus, OH, United States
| | - Elizabeth Day
- College of Optometry, The Ohio State University, Columbus, OH, United States
| | - Lisa Jordan
- College of Optometry, The Ohio State University, Columbus, OH, United States
| | - Matthew Robich
- College of Optometry, The Ohio State University, Columbus, OH, United States
| | - Julie Racine
- Department of Ophthalmology, Nationwide Children's Hospital, Columbus, OH, United States
| | | | - Dean A. VanNasdale
- College of Optometry, The Ohio State University, Columbus, OH, United States
| | - Phillip T. Yuhas
- College of Optometry, The Ohio State University, Columbus, OH, United States,*Correspondence: Phillip T. Yuhas
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4
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DDAH1 Promotes Lung Endothelial Barrier Repair by Decreasing Leukocyte Transendothelial Migration and Oxidative Stress in Explosion-Induced Lung Injury. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:8407635. [PMID: 35620579 PMCID: PMC9130000 DOI: 10.1155/2022/8407635] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Accepted: 05/02/2022] [Indexed: 11/17/2022]
Abstract
Explosion-induced injury is the most commonly encountered wound in modern warfare and incidents. The vascular inflammatory response and subsequent oxidative stress are considered the key causes of morbidity and mortality among those in blast lung injury. It has been reported dimethylarginine dimethylaminohydrolase 1 (DDAH1) plays important roles in regulating vascular endothelial injury repair and angiogenesis, but its role in explosion-induced injury remains to be explained. To explore the mechanism of vascular injury in blast lung, 40 C57BL/6 wild type mice and 40 DDAH1 knockout mice were randomly equally divided into control group and blast group, respectively. Body weight, lung weight, and dry weight of the lungs were recorded. Diffuse vascular leakage was detected by Evans blue test. The serum inflammatory factors, nitric oxide (NO) contents, and ADMA level were determined through ELISA. Hematoxylin-eosin staining and ROS detection were performed for histopathological changes. Western blot was used to detect the proteins related to oxidative stress, cell adhesion molecules and leukocyte transendothelial migration, vascular injury, endothelial barrier dysfunction, and the DDAH1/ADMA/eNOS signaling pathway. We found that DDAH1 deficiency aggravated explosion-induced body weight reduction, lung weight promotion, diffuse vascular leakage histopathological changes, and the increased levels of inflammatory-related factors. Additionally, DDAH1 deficiency also increased ROS generation, MDA, and IRE-1α expression. Regarding vascular endothelial barrier dysfunction, DDAH1 deficiency increased the expression of ICAM-1, Itgal, Rac2, VEGF, MMP9, vimentin, and N-cadherin, while lowering the expression of occludin, CD31, and dystrophin. DDAH1 deficiency also exacerbated explosion-induced increase of ADMA and decrease of eNOS activity and NO contents. Our results indicated that explosion could induce severe lung injury and pulmonary vascular insufficiency, whereas DDAH1 could promote lung endothelial barrier repair and reduce inflammation and oxidative stress by inhibiting ADMA signaling which in turn increased eNOS activity.
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5
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Szarka G, Balogh M, Tengölics ÁJ, Ganczer A, Völgyi B, Kovács-Öller T. The role of gap junctions in cell death and neuromodulation in the retina. Neural Regen Res 2021; 16:1911-1920. [PMID: 33642359 PMCID: PMC8343308 DOI: 10.4103/1673-5374.308069] [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: 07/15/2020] [Revised: 10/14/2020] [Accepted: 01/11/2021] [Indexed: 12/26/2022] Open
Abstract
Vision altering diseases, such as glaucoma, diabetic retinopathy, age-related macular degeneration, myopia, retinal vascular disease, traumatic brain injuries and others cripple many lives and are projected to continue to cause anguish in the foreseeable future. Gap junctions serve as an emerging target for neuromodulation and possible regeneration as they directly connect healthy and/or diseased cells, thereby playing a crucial role in pathophysiology. Since they are permeable for macromolecules, able to cross the cellular barriers, they show duality in illness as a cause and as a therapeutic target. In this review, we take recent advancements in gap junction neuromodulation (pharmacological blockade, gene therapy, electrical and light stimulation) into account, to show the gap junction's role in neuronal cell death and the possible routes of rescuing neuronal and glial cells in the retina succeeding illness or injury.
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Affiliation(s)
- Gergely Szarka
- János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
- Retinal Electrical Synapses Research Group, National Brain Research Program (NAP 2.0), Hungarian Academy of Sciences, Budapest, Hungary
- Department of Experimental Zoology and Neurobiology, University of Pécs, Pécs, Hungary
| | - Márton Balogh
- János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
- Retinal Electrical Synapses Research Group, National Brain Research Program (NAP 2.0), Hungarian Academy of Sciences, Budapest, Hungary
- Department of Experimental Zoology and Neurobiology, University of Pécs, Pécs, Hungary
| | - Ádám J. Tengölics
- János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
- Retinal Electrical Synapses Research Group, National Brain Research Program (NAP 2.0), Hungarian Academy of Sciences, Budapest, Hungary
- Department of Experimental Zoology and Neurobiology, University of Pécs, Pécs, Hungary
| | - Alma Ganczer
- János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
- Retinal Electrical Synapses Research Group, National Brain Research Program (NAP 2.0), Hungarian Academy of Sciences, Budapest, Hungary
- Department of Experimental Zoology and Neurobiology, University of Pécs, Pécs, Hungary
| | - Béla Völgyi
- János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
- Retinal Electrical Synapses Research Group, National Brain Research Program (NAP 2.0), Hungarian Academy of Sciences, Budapest, Hungary
- Department of Experimental Zoology and Neurobiology, University of Pécs, Pécs, Hungary
- Medical School, University of Pécs, Pécs, Hungary
| | - Tamás Kovács-Öller
- János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
- Retinal Electrical Synapses Research Group, National Brain Research Program (NAP 2.0), Hungarian Academy of Sciences, Budapest, Hungary
- Medical School, University of Pécs, Pécs, Hungary
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6
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Hussain SF, Raza Z, Cash ATG, Zampieri T, Mazzoli RA, Kardon RH, Gomes RSM. Traumatic brain injury and sight loss in military and veteran populations- a review. Mil Med Res 2021; 8:42. [PMID: 34315537 PMCID: PMC8317328 DOI: 10.1186/s40779-021-00334-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 06/23/2021] [Indexed: 01/14/2023] Open
Abstract
War and combat exposure pose great risks to the vision system. More recently, vision related deficiencies and impairments have become common with the increased use of powerful explosive devices and the subsequent rise in incidence of traumatic brain injury (TBI). Studies have looked at the effects of injury severity, aetiology of injury and the stage at which visual problems become apparent. There was little discrepancy found between the frequencies or types of visual dysfunctions across blast and non-blast related groups, however complete sight loss appeared to occur only in those who had a blast-related injury. Generally, the more severe the injury, the greater the likelihood of specific visual disturbances occurring, and a study found total sight loss to only occur in cases with greater severity. Diagnosis of mild TBI (mTBI) is challenging. Being able to identify a potential TBI via visual symptoms may offer a new avenue for diagnosis.
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Affiliation(s)
- Syeda F. Hussain
- Research & Innovation, Blind Veterans UK, 12-14 Harcourt Street, London, W1H 4HD UK
- Bravo Victor, Research, 12-14 Harcourt Street, London, W1H 4HD UK
| | - Zara Raza
- Research & Innovation, Blind Veterans UK, 12-14 Harcourt Street, London, W1H 4HD UK
- Bravo Victor, Research, 12-14 Harcourt Street, London, W1H 4HD UK
| | - Andrew T. G. Cash
- Research & Innovation, Blind Veterans UK, 12-14 Harcourt Street, London, W1H 4HD UK
- Bravo Victor, Research, 12-14 Harcourt Street, London, W1H 4HD UK
| | - Thomas Zampieri
- Blinded Veterans Association, 1101 King Street, Suite 300, Alexandria, Virginia 22314 USA
| | - Robert A. Mazzoli
- Department of Ophthalmology, Madigan Army Medical Center, 9040 Jackson Avenue, Tacoma, Washington, 98431 USA
| | - Randy H. Kardon
- Iowa City VA Health Care System and Iowa City VA Center for the Prevention and Treatment of Visual Loss, Iowa City, Iowa 52246 USA
- Department of Ophthalmology and Visual Sciences, The University of Iowa, Iowa City, Iowa 52242 USA
| | - Renata S. M. Gomes
- Research & Innovation, Blind Veterans UK, 12-14 Harcourt Street, London, W1H 4HD UK
- Bravo Victor, Research, 12-14 Harcourt Street, London, W1H 4HD UK
- Northern Hub for Veterans and Military Families Research, Department of Nursing, Midwifery and Health, Faculty of Health and Life Sciences, Northumbria University, Newcastle, NE7 7XA UK
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7
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Axonopathy precedes cell death in ocular damage mediated by blast exposure. Sci Rep 2021; 11:11774. [PMID: 34083587 PMCID: PMC8175471 DOI: 10.1038/s41598-021-90412-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 05/04/2021] [Indexed: 12/13/2022] Open
Abstract
Traumatic brain injuries (TBI) of varied types are common across all populations and can cause visual problems. For military personnel in combat settings, injuries from blast exposures (bTBI) are prevalent and arise from a myriad of different situations. To model these diverse conditions, we are one of several groups modeling bTBI using mice in varying ways. Here, we report a refined analysis of retinal ganglion cell (RGC) damage in male C57BL/6J mice exposed to a blast-wave in an enclosed chamber. Ganglion cell layer thickness, RGC density (BRN3A and RBPMS immunoreactivity), cellular density of ganglion cell layer (hematoxylin and eosin staining), and axon numbers (paraphenylenediamine staining) were quantified at timepoints ranging from 1 to 17-weeks. RNA sequencing was performed at 1-week and 5-weeks post-injury. Earliest indices of damage, evident by 1-week post-injury, are a loss of RGC marker expression, damage to RGC axons, and increase in glial markers expression. Blast exposure caused a loss of RGC somas and axons—with greatest loss occurring by 5-weeks post-injury. While indices of glial involvement are prominent early, they quickly subside as RGCs are lost. The finding that axonopathy precedes soma loss resembles pathology observed in mouse models of glaucoma, suggesting similar mechanisms.
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8
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Evans LP, Boehme N, Wu S, Burghardt EL, Akurathi A, Todd BP, Newell EA, Ferguson PJ, Mahajan VB, Dutca LM, Harper MM, Bassuk AG. Sex Does Not Influence Visual Outcomes After Blast-Mediated Traumatic Brain Injury but IL-1 Pathway Mutations Confer Partial Rescue. Invest Ophthalmol Vis Sci 2021; 61:7. [PMID: 33030508 PMCID: PMC7582458 DOI: 10.1167/iovs.61.12.7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Purpose In a mouse model of blast-mediated traumatic brain injury (bTBI), interleukin-1 (IL-1)-pathway components were tested as potential therapeutic targets for bTBI-mediated retinal ganglion cell (RGC) dysfunction. Sex was also evaluated as a variable for RGC outcomes post-bTBI. Methods Male and female mice with null mutations in genes encoding IL-1α, IL-1β, or IL-1RI were compared to C57BL/6J wild-type (WT) mice after exposure to three 20-psi blast waves given at an interblast interval of 1 hour or to mice receiving sham injury. To determine if genetic blockade of IL-1α, IL-1β, or IL-1RI could prevent damage to RGCs, the function and structure of these cells were evaluated by pattern electroretinogram and optical coherence tomography, respectively, 5 weeks following blast or sham exposure. RGC survival was also quantitatively assessed via immunohistochemical staining of BRN3A at the completion of the study. Results Our results showed that male and female WT mice had a similar response to blast-induced retinal injury. Generally, constitutive deletion of IL-1α, IL-1β, or IL-1RI did not provide full protection from the effects of bTBI on visual outcomes; however, injured WT mice had significantly worse visual outcomes compared to the injured genetic knockout mice. Conclusions Sex does not affect RGC outcomes after bTBI. The genetic studies suggest that deletion of these IL-1 pathway components confers some protection, but global deletion from birth did not result in a complete rescue.
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Affiliation(s)
- Lucy P Evans
- Department of Pediatrics, University of Iowa, Iowa City, Iowa, United States.,Medical Scientist Training Program, University of Iowa, Iowa City, Iowa, United States
| | - Nickolas Boehme
- Iowa City VA Health Care System Center for the Prevention and Treatment of Visual Loss, Iowa City, Iowa, United States
| | - Shu Wu
- Department of Pediatrics, University of Iowa, Iowa City, Iowa, United States
| | - Elliot L Burghardt
- Medical Scientist Training Program, University of Iowa, Iowa City, Iowa, United States.,Department of Biostatistics, University of Iowa, Iowa City, Iowa, United States
| | - Abhigna Akurathi
- Iowa City VA Health Care System Center for the Prevention and Treatment of Visual Loss, Iowa City, Iowa, United States
| | - Brittany P Todd
- Department of Pediatrics, University of Iowa, Iowa City, Iowa, United States.,Medical Scientist Training Program, University of Iowa, Iowa City, Iowa, United States
| | - Elizabeth A Newell
- Department of Pediatrics, University of Iowa, Iowa City, Iowa, United States
| | - Polly J Ferguson
- Department of Pediatrics, University of Iowa, Iowa City, Iowa, United States
| | - Vinit B Mahajan
- Omics Laboratory, Byers Eye Institute, Department of Ophthalmology, Stanford University School of Medicine, Palo Alto, California, United States.,Veterans Affairs Palo Alto Health Care System, Palo Alto, California, United States
| | - Laura M Dutca
- Iowa City VA Health Care System Center for the Prevention and Treatment of Visual Loss, Iowa City, Iowa, United States.,Department of Ophthalmology and Visual Sciences, University of Iowa, Iowa City, Iowa, United States
| | - Matthew M Harper
- Iowa City VA Health Care System Center for the Prevention and Treatment of Visual Loss, Iowa City, Iowa, United States.,Department of Ophthalmology and Visual Sciences, University of Iowa, Iowa City, Iowa, United States
| | - Alexander G Bassuk
- Department of Pediatrics, University of Iowa, Iowa City, Iowa, United States
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9
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Evans LP, Roghair AM, Gilkes NJ, Bassuk AG. Visual Outcomes in Experimental Rodent Models of Blast-Mediated Traumatic Brain Injury. Front Mol Neurosci 2021; 14:659576. [PMID: 33935648 PMCID: PMC8081965 DOI: 10.3389/fnmol.2021.659576] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 03/18/2021] [Indexed: 11/24/2022] Open
Abstract
Blast-mediated traumatic brain injuries (bTBI) cause long-lasting physical, cognitive, and psychological disorders, including persistent visual impairment. No known therapies are currently utilized in humans to lessen the lingering and often serious symptoms. With TBI mortality decreasing due to advancements in medical and protective technologies, there is growing interest in understanding the pathology of visual dysfunction after bTBI. However, this is complicated by numerous variables, e.g., injury location, severity, and head and body shielding. This review summarizes the visual outcomes observed by various, current experimental rodent models of bTBI, and identifies data showing that bTBI activates inflammatory and apoptotic signaling leading to visual dysfunction. Pharmacologic treatments blocking inflammation and cell death pathways reported to alleviate visual deficits in post-bTBI animal models are discussed. Notably, techniques for assessing bTBI outcomes across exposure paradigms differed widely, so we urge future studies to compare multiple models of blast injury, to allow data to be directly compared.
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Affiliation(s)
- Lucy P. Evans
- Department of Pediatrics, University of Iowa, Iowa City, IA, United States
- Medical Scientist Training Program, University of Iowa, Iowa City, IA, United States
| | - Ariel M. Roghair
- Department of Pediatrics, University of Iowa, Iowa City, IA, United States
| | - Noah J. Gilkes
- Department of Pediatrics, University of Iowa, Iowa City, IA, United States
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11
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Clinical observations and considerations in the treatment of Terson syndrome using 23G vitrectomy. Int Ophthalmol 2020; 40:2185-2190. [PMID: 32377886 DOI: 10.1007/s10792-020-01399-0] [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: 06/12/2019] [Accepted: 04/24/2020] [Indexed: 10/24/2022]
Abstract
PURPOSE This retrospective study analyzed the results of 23G vitrectomy for the treatment of intraocular hemorrhage in patients with Terson syndrome. The pathogenesis of Terson syndrome and the timing of vitrectomy are discussed. METHODS Eight eyes of eight patients were included in the study. Intrasurgical images were acquired, and membranes peeled off during surgery were subjected to pathological staining. Postoperative examination included visual acuity, intraocular pressure, funduscopy, and optical coherence tomography angiography. RESULTS The course of visual impairment in the patients ranged from < 1 to 5 months; visual acuity ranged from light perception to 20/1000. Surgeries in the eight patients were all successful, and no severe complications were observed. Visual acuity improved in each operative eye. Pathological staining revealed only fibrous connective tissue, and no nerve fibers in the membranes peeled off during surgery. Optical coherence tomography angiography revealed no changes in blood vessel density in the inner layer of the retina of the operative eye compared with the non-operative eye in each patient. CONCLUSIONS Timely surgical intervention is necessary for the treatment of intraocular hemorrhage in patients with Terson syndrome. Clinical findings support the theory that intraocular blood results from stasis or rupture of retinal superficial peripapillary vessels caused by elevated intracranial pressure.
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12
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Evans LP, Woll AW, Wu S, Todd BP, Hehr N, Hedberg-Buenz A, Anderson MG, Newell EA, Ferguson PJ, Mahajan VB, Harper MM, Bassuk AG. Modulation of Post-Traumatic Immune Response Using the IL-1 Receptor Antagonist Anakinra for Improved Visual Outcomes. J Neurotrauma 2020; 37:1463-1480. [PMID: 32056479 PMCID: PMC7249480 DOI: 10.1089/neu.2019.6725] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The purpose of this study was to characterize acute changes in inflammatory pathways in the mouse eye after blast-mediated traumatic brain injury (bTBI) and to determine whether modulation of these pathways could protect the structure and function of retinal ganglion cells (RGC). The bTBI was induced in C57BL/6J male mice by exposure to three 20 psi blast waves directed toward the head with the body shielded, with an inter-blast interval of one hour. Acute cytokine expression in retinal tissue was measured through reverse transcription-quantitative polymerase chain reaction (RT-qPCR) four hours post-blast. Increased retinal expression of interleukin (lL)-1β, IL-1α, IL-6, and tumor necrosis factor (TNF)α was observed in bTBI mice exposed to blast when compared with shams, which was associated with activation of microglia and macroglia reactivity, assessed via immunohistochemistry with ionized calcium binding adaptor molecule 1 and glial fibrillary acidic protein, respectively, one week post-blast. Blockade of the IL-1 pathway was accomplished using anakinra, an IL-1RI antagonist, administered intra-peritoneally for one week before injury and continuing for three weeks post-injury. Retinal function and RGC layer thickness were evaluated four weeks post-injury using pattern electroretinogram (PERG) and optical coherence tomography (OCT), respectively. After bTBI, anakinra treatment resulted in a preservation of RGC function and RGC structure when compared with saline treated bTBI mice. Optic nerve integrity analysis demonstrated a trend of decreased damage suggesting that IL-1 blockade also prevents axonal damage after blast. Blast exposure results in increased retinal inflammation including upregulation of pro-inflammatory cytokines and activation of resident microglia and macroglia. This may explain partially the RGC loss we observed in this model, as blockade of the acute inflammatory response after injury with the IL-1R1 antagonist anakinra resulted in preservation of RGC function and RGC layer thickness.
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Affiliation(s)
- Lucy P Evans
- Department of Pediatrics, University of Iowa, Iowa City, Iowa, USA.,Medical Scientist Training Program, University of Iowa, Iowa City, Iowa, USA
| | - Addison W Woll
- Department of Psychiatry, University of Iowa, Iowa City, Iowa, USA
| | - Shu Wu
- Department of Pediatrics, University of Iowa, Iowa City, Iowa, USA
| | - Brittany P Todd
- Department of Pediatrics, University of Iowa, Iowa City, Iowa, USA
| | - Nicole Hehr
- Department of Pediatrics, University of Iowa, Iowa City, Iowa, USA
| | - Adam Hedberg-Buenz
- The Iowa City Department of Veterans Affairs Center for the Prevention and Treatment of Visual Loss, Iowa City, Iowa, USA.,Department of Molecular Physiology and Biophysics, and University of Iowa, Iowa City, Iowa, USA
| | - Michael G Anderson
- The Iowa City Department of Veterans Affairs Center for the Prevention and Treatment of Visual Loss, Iowa City, Iowa, USA.,Department of Molecular Physiology and Biophysics, and University of Iowa, Iowa City, Iowa, USA.,Department of Ophthalmology and Visual Sciences, University of Iowa, Iowa City, Iowa, USA
| | | | - Polly J Ferguson
- Department of Pediatrics, University of Iowa, Iowa City, Iowa, USA
| | - Vinit B Mahajan
- Omics Laboratory, Byers Eye Institute, Department of Ophthalmology, Stanford University School of Medicine, Palo Alto, California, USA.,Veterans Affairs Palo Alto Health Care System, Palo Alto, California, USA
| | - Matthew M Harper
- The Iowa City Department of Veterans Affairs Center for the Prevention and Treatment of Visual Loss, Iowa City, Iowa, USA.,Department of Ophthalmology and Visual Sciences, University of Iowa, Iowa City, Iowa, USA
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Harper MM, Rudd D, Meyer KJ, Kanthasamy AG, Anantharam V, Pieper AA, Vázquez-Rosa E, Shin MK, Chaubey K, Koh Y, Evans LP, Bassuk AG, Anderson MG, Dutca L, Kudva IT, John M. Identification of chronic brain protein changes and protein targets of serum auto-antibodies after blast-mediated traumatic brain injury. Heliyon 2020; 6:e03374. [PMID: 32099918 PMCID: PMC7029173 DOI: 10.1016/j.heliyon.2020.e03374] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 07/19/2019] [Accepted: 02/03/2020] [Indexed: 12/13/2022] Open
Abstract
In addition to needing acute emergency management, blast-mediated traumatic brain injury (TBI) is also a chronic disorder with delayed-onset symptoms that manifest and progress over time. While the immediate consequences of acute blast injuries are readily apparent, chronic sequelae are harder to recognize. Indeed, the identification of individuals with mild-TBI or TBI-induced symptoms is greatly impaired in large part due to the lack of objective and robust biomarkers. The purpose of this study was to address these need by identifying candidates for serum-based biomarkers of blast TBI, and also to identify unique or differentially regulated protein expression in the thalamus in C57BL/6J mice exposed to blast using high throughput qualitative screens of protein expression. To identify thalamic proteins differentially or uniquely associated with blast exposure, we utilized an antibody-based affinity-capture strategy (referred to as "proteomics-based analysis of depletomes"; PAD) to deplete thalamic lysates from blast-treated mice of endogenous thalamic proteins also found in control mice. Analysis of this "depletome" detected 75 unique proteins, many with associations to the myelin sheath. To identify blast-associated proteins eliciting production of circulating autoantibodies, serum antibodies of blast-treated mice were immobilized, and their immunogens subsequently identified by proteomic analysis of proteins specifically captured following incubation with thalamic lysates (a variant of a strategy referred to as "proteomics-based expression library screening"; PELS). This analysis identified 46 blast-associated immunogenic proteins, including 6 shared in common with the PAD analysis (ALDOA, PHKB, HBA-A1, DPYSL2, SYN1, and CKB). These proteins and their autoantibodies are appropriate for further consideration as biomarkers of blast-mediated TBI.
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Affiliation(s)
- Matthew M. Harper
- The Iowa City Department of Veterans Affairs Medical Center, Center for the Prevention and Treatment of Visual Loss, Iowa City, IA, USA
- The University of Iowa Department of Ophthalmology and Visual Sciences, University of Iowa, Iowa City, IA, USA
| | - Danielle Rudd
- The Iowa City Department of Veterans Affairs Medical Center, Center for the Prevention and Treatment of Visual Loss, Iowa City, IA, USA
| | - Kacie J. Meyer
- The University of Iowa Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA, USA
| | | | | | - Andrew A. Pieper
- Harrington Discovery Institute, University Hospitals of Cleveland, Department of Psychiatry Case Western Reserve University, Geriatric Research Education and Clinical Centers, Louis Stokes VA Medical Center, Cleveland, OH 44106, USA
| | - Edwin Vázquez-Rosa
- Harrington Discovery Institute, University Hospitals of Cleveland, Department of Psychiatry Case Western Reserve University, Geriatric Research Education and Clinical Centers, Louis Stokes VA Medical Center, Cleveland, OH 44106, USA
| | - Min-Kyoo Shin
- Harrington Discovery Institute, University Hospitals of Cleveland, Department of Psychiatry Case Western Reserve University, Geriatric Research Education and Clinical Centers, Louis Stokes VA Medical Center, Cleveland, OH 44106, USA
| | - Kalyani Chaubey
- Harrington Discovery Institute, University Hospitals of Cleveland, Department of Psychiatry Case Western Reserve University, Geriatric Research Education and Clinical Centers, Louis Stokes VA Medical Center, Cleveland, OH 44106, USA
| | - Yeojung Koh
- Harrington Discovery Institute, University Hospitals of Cleveland, Department of Psychiatry Case Western Reserve University, Geriatric Research Education and Clinical Centers, Louis Stokes VA Medical Center, Cleveland, OH 44106, USA
| | - Lucy P. Evans
- The University of Iowa Department of Pediatrics, University of Iowa, Iowa City, IA, USA
- The University of Iowa Department of Neurology, University of Iowa, Iowa City, IA, USA
- The University of Iowa Department of Medical Scientist Training Program, University of Iowa, Iowa City, IA, USA
| | - Alexander G. Bassuk
- The University of Iowa Department of Pediatrics, University of Iowa, Iowa City, IA, USA
- The University of Iowa Department of Neurology, University of Iowa, Iowa City, IA, USA
| | - Michael G. Anderson
- The Iowa City Department of Veterans Affairs Medical Center, Center for the Prevention and Treatment of Visual Loss, Iowa City, IA, USA
- The University of Iowa Department of Ophthalmology and Visual Sciences, University of Iowa, Iowa City, IA, USA
- The University of Iowa Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA, USA
| | - Laura Dutca
- The Iowa City Department of Veterans Affairs Medical Center, Center for the Prevention and Treatment of Visual Loss, Iowa City, IA, USA
| | - Indira T. Kudva
- Food Safety and Enteric Pathogens Research Unit, National Animal Disease Center, Agricultural Research Service, U.S. Department of Agriculture, Ames, IA, USA
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14
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Wang Y, Mao J, Wang X, Lin Y, Hou G, Zhu J, Xie B. Genome-wide screening of altered m6A-tagged transcript profiles in the hippocampus after traumatic brain injury in mice. Epigenomics 2019; 11:805-819. [PMID: 30882247 DOI: 10.2217/epi-2019-0002] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Aim: To systematically profile RNA m6A modification landscape after traumatic brain injury (TBI) in mice. Materials & methods: Expression of m6A-related genes was detected by quantitative real-time PCR (qPCR). Expression and location of METTL3, a key component of m6A methyltransferase complex, were determined by immunostaining. Genome-wide profiling of m6A-tagged transcripts was conducted by m6A-modified RNA immunoprecipitation sequencing (m6A-RIP-seq) and RNA sequencing (RNA-seq). Results: METTL3 was downregulated after TBI. In total, 922 m6A peaks were differentially expressed as determined by m6A-RIP-seq, with 370 upregulated and 552 downregulated. In addition, we identified differentially expressed hypomethylated and hypermethylated mRNA transcripts. Conclusion: Our data provided novel information regarding m6A modification changes in the early period of TBI, which might be promising therapy targets.
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Affiliation(s)
- Yiqin Wang
- CNRS-LIA Hematology and Cancer, Sino-French Research Center for Life Sciences & Genomics, State Key Laboratory of Medical Genomics, Rui-Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, PR China
| | - Jian Mao
- Department of Neurosurgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, PR China
| | - Xin Wang
- Department of Anesthesiology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Pudong New District, Shanghai 200127, PR China
| | - Yong Lin
- Department of Neurosurgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, PR China
| | - Guoqiang Hou
- Department of Neurosurgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, PR China
| | - Jun Zhu
- CNRS-LIA Hematology and Cancer, Sino-French Research Center for Life Sciences & Genomics, State Key Laboratory of Medical Genomics, Rui-Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, PR China
| | - Baoshu Xie
- Department of Neurosurgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, PR China
- Department of Neurosurgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510080, Guangdong Province, PR China
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Ludwig CA, Shields RA, Do DV, Moshfeghi DM, Mahajan VB. Traumatic chorioretinitis sclopetaria: Risk factors, management, and prognosis. Am J Ophthalmol Case Rep 2019; 14:39-46. [PMID: 30834355 PMCID: PMC6384308 DOI: 10.1016/j.ajoc.2019.02.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 02/07/2019] [Indexed: 11/29/2022] Open
Abstract
Purpose To describe new cases of sclopetaria and evaluate the risk factors, management, and visual prognosis of all reported cases in the literature. Observations We performed a retrospective, observational case series. This study included six cases (median age 23, interquartile range 33) of sclopetaria. Additionally, literature searches were conducted in the PubMed and Cochrane Library databases to uncover risk factors associated with all published cases of sclopetaria. Main outcome measure was best corrected visual acuity (BCVA) worse than 20/20. Sixty-seven cases (71 eyes) of sclopetaria have been reported, of which 59 cases (61 eyes) met inclusion criteria in this study. Most were young (median age 19.5 years) men (51/59, 88.1%). Thirty-seven eyes were observed while 24 underwent immediate surgery including six pars plana vitrectomies and three scleral buckles. Compared to initial presentation, BCVA improved in 31/48 (64.6%) eyes, remained stable in 12/48 eyes (25.0%), and worsened in 5/48 eyes (10.4%). Ten patients (16.4%) achieved a final BCVA of 20/20 with median follow up time of seven months. In a multivariate model, location of sclopetaria in the macula, temporal retina, or immediate orbital foreign body removal predicted poor final BCVA with an area under receiver operating characteristic curve of 0.767. Conclusions and importance Traumatic chorioretinitis sclopetaria is rare, but reports have increased dramatically over the past two decades. While pars plana vitrectomy may be required for the management of retinal detachments and non-clearing vitreous hemorrhage, close observation is appropriate in most cases. Visual prognosis is poor with most patients attaining 20/200 vision or worse.
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Affiliation(s)
- Cassie A Ludwig
- Byers Eye Institute, Department of Ophthalmology, Stanford University, Palo Alto, CA, USA
| | - Ryan A Shields
- Byers Eye Institute, Department of Ophthalmology, Stanford University, Palo Alto, CA, USA
| | - Diana V Do
- Byers Eye Institute, Department of Ophthalmology, Stanford University, Palo Alto, CA, USA
| | - Darius M Moshfeghi
- Byers Eye Institute, Department of Ophthalmology, Stanford University, Palo Alto, CA, USA
| | - Vinit B Mahajan
- Byers Eye Institute, Department of Ophthalmology, Stanford University, Palo Alto, CA, USA.,Omics Laboratory, Stanford University, Palo Alto, CA, USA.,Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
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