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Glutamate Neurotransmission in Rodent Models of Traumatic Brain Injury
Open accessAbstract
Traumatic brain injury (TBI) is a leading cause of death and disability in people younger than 45 and is a significant public health concern. In addition to primary mechanical damage to cells and tissue, TBI involves additional molecular mechanisms of injury, termed secondary injury, that continue to evolve over hours, days, weeks, and beyond. The trajectory of recovery after TBI is highly unpredictable and in many cases results in chronic cognitive and behavioral changes. Acutely after TBI, there is an unregulated release of glutamate that cannot be buffered or cleared effectively, resulting in damaging levels of glutamate in the extracellular space. This initial loss of glutamate homeostasis may initiate additional changes in glutamate regulation. The excitatory amino acid transporters (EAATs) are expressed on both neurons and glia and are the principal mechanism for maintaining extracellular glutamate levels. Diffusion of glutamate outside the synapse due to impaired uptake may lead to increased extrasynaptic glutamate signaling, secondary injury through activation of cell death pathways, and loss of fidelity and specificity of synaptic transmission. Coordination of glutamate release and uptake is critical to regulating synaptic strength, long-term potentiation and depression, and cognitive processes. In this review, we will discuss dysregulation of extracellular glutamate and glutamate uptake in the acute stage of TBI and how failure to resolve acute disruptions in glutamate homeostatic mechanisms may play a causal role in chronic cognitive symptoms after TBI.
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“Secondary damage includes excitotoxicity (64), oxidative stress (65), and widespread neuroinflammation (63).”
From The Inflammatory Continuum of Traumatic Brain Injury and Alzheimer’s Disease (2018) · cites this paper as [64]
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Brain interleukins and Alzheimer’s disease
Abdelhamed, H. G., Hassan, A. A., Sakraan, A., Al-Deeb, R. T., Mousa, D. M., Ezz, H. S. A., Noor, N. A., Khadrawy, Y. A., & Radwan, N. M. (2025) · Metabolic Brain Disease · doi:10.1007/s11011-025-01538-5 · Cited by 20
“Glutamate toxicity may increase the influx of Ca 2+ into neurons and the subsequent generation of oxidative/nitrosa - tive species that damage neurons (Nicholls 2008; Dorsett et al. 2017 ).”
Zhu, H., Zhang, H., Zhao, X.-J., Zhang, L., Liu, X., Zhang, Z., Ren, Y., & Feng, Y. (2024) · Journal of Neuroimmune Pharmacology · doi:10.1007/s11481-024-10138-6 · Cited by 21
“The secondary stage is triggered by the initial injury and includes excitotoxicity, mitochondrial dysfunction, and neuroinflammation (Anthonymuthu et al. 2016, Dorsett et al. 2017, Jassam et al. 2017).”
Qin, Q., Wang, T., Xu, Z., Liu, S., Zhang, H., Du, Z., Wang, J., Wang, Y., Wang, Z., Yuan, S., et al. (2022) · Stem Cell Research & Therapy · doi:10.1186/s13287-022-03032-6 · Cited by 22
“External trauma might cause structural damage, oxidative stress, excessive excitatory neurotransmitters [3], and an inflammatory cascade responsible for further cell death [4], leading to anatomical and functional brain damage.”
Galantamine protects against synaptic, axonal, and vision deficits in experimental neurotrauma
Naguib, S., Bernardo-Colón, A., Cencer, C. S., Gandra, N., & Rex, T. S. (2019) · Neurobiology of Disease · doi:10.1016/j.nbd.2019.104695 · Cited by 17
“(Dorsett et al., 2017) Additionally, TBI in rats results in excess glutamate followed by a down-regulation in expression of GLAST and EAAT1 in glial cells.”
Why Does Brain Trauma Research Fail?
Alves, J. L., Rato, J. R., & da Silva, V. M. M. (2019) · World Neurosurgery · doi:10.1016/j.wneu.2019.06.212 · Cited by 26
Vascular and non‐vascular contributors to memory reduction during traumatic brain injury
Charkviani, M., Muradashvili, N., & Lominadze, D. G. (2019) · European Journal of Neuroscience · doi:10.1111/ejn.14390 · Cited by 17
“During moderate to severe TBI levels of extracellular glutamate are increased (Dorsett et al., 2017; Guerriero, Giza, & Rotenberg, 2015), leading to enhanced calcium influx through hyperactivation of NMDARs, resulting in calcium overload and neurodegeneration due to excitotoxicity (Hardingham, 2009).”
BackgroundTraumatic brain injury impairs sensorimotor function in mice
Sackheim, A. M., Stockwell, D. W., Villalba, N., Haines, L., Scott, C., Russell, S., Hammack, S. E., & Freeman, K. (2017) · Journal of Surgical Research · doi:10.1016/j.jss.2017.02.016 · Cited by 17
Huang, Z., Xu, P., Hess, D. C., & Zhang, Q. (2024) · Translational Neurodegeneration · doi:10.1186/s40035-024-00457-2 · Cited by 20
Zhao, Y., Zhou, Y., & Chen, J. (2023) · Chinese Journal of Traumatology · doi:10.1016/j.cjtee.2023.08.003 · Cited by 21
“Adenosine, acting via A 2A R, exerts neuromodulation of secondary injuries and in fl uences the outcomes and sequelae of TBI by neuroin fl ammation 84 e 86 , BBB impairment 68 , controlling glutamate-induced excitotoxicity 87 , autophagy blocking and lipid peroxidation 88 .”
BackgroundPolygalasaponin F protects hippocampal neurons against glutamate-induced cytotoxicity
Li, B., Sun, C., Cao, X.-C., Liu, Z., & Ma, C. (2021) · Neural Regeneration Research · doi:10.4103/1673-5374.314321 · Cited by 18
“Furthermore, glutamate excitotoxicity-induced neuronal death is one of the major pathogenic mechanisms underlying these neurological disorders (Lau and Tymianski, 2010; Mehta et al., 2013; Huberfeld and Vecht, 2016; Dorsett et al., 2017; Jiang et al., 2019; Chu et al., 2020).”
BackgroundImproving Sensitivity and Longevity of In Vivo Glutamate Sensors with Electrodeposited NanoPt
Robbins, E. M., Wong, B., Pwint, M. Y., Salavatian, S., Mahajan, A., & Cui, X. T. (2024) · ACS Applied Materials & Interfaces · doi:10.1021/acsami.4c06692 · Cited by 15
Alyenbaawi, H., Allison, W. T., & Mok, S. (2020) · Biomolecules · doi:10.3390/biom10111487 · Cited by 20
Supplement and nutraceutical therapy in traumatic brain injury
Lucke-Wold, B. P., Zasler, N. D., Ruchika, F., Weisman, S., Le, D., Brunicardi, J., Kong, I., Ghumman, H., Persad, S., Mahan, D., et al. (2024) · Nutritional Neuroscience · doi:10.1080/1028415x.2024.2404782 · Cited by 20
Baazaoui, N., Alfaifi, M., Saad, R. B., & Garzoli, S. (2024) · Neuroscience · doi:10.1016/j.neuroscience.2024.12.023 · Cited by 14
Bano, N., Khan, S., Ahamad, S., Dar, N. J., Alanazi, H. H., Nazir, A., & Bhat, S. A. (2025) · Ageing Research Reviews · doi:10.1016/j.arr.2025.102735 · Cited by 13
Epidemiology, Pathophysiology, and Treatment Strategies of Concussions: A Comprehensive Review
Ahmed, Z., Chaudhary, F., Fraix, M. P., & Agrawal, D. K. (2024) · Fortune Journal of Health Sciences · doi:10.26502/fjhs.178 · Cited by 13
“Thus, there is an accumulation of intracellular organelles at the site of damage resulting in focal swelling and leading to secondary axotomy [46, 69] ( Figure 4 ).”
Cao, J., Yu, X. H., Liu, J., Fu, J., Wang, B., Wu, C., Zhang, S., Chen, H., Wang, Z., Xu, Y., et al. (2024) · Neural Regeneration Research · doi:10.4103/nrr.nrr-d-23-01863 · Cited by 23
“For example, EAAT2 knockout led to life-threatening spontaneous seizures and substantial neuronal loss in mice, whereas functional EAAT2 prevented post-traumatic seizures in rat models of brain trauma (Dorsett et al., 2017; Liu et al., 2020).”
Cui, Y., Xu, L., Wang, F., Wang, Z., Tong, X., & Yan, H. (2022) · Frontiers in Immunology · doi:10.3389/fimmu.2022.928343 · Cited by 12
Planeta, K., Setkowicz, Z., Czyzycki, M., Janik-Olchawa, N., Ryszawy, D., Janeczko, K., Simon, R., Baumbach, T., & Chwiej, J. (2022) · International Journal of Molecular Sciences · doi:10.3390/ijms23020703 · Cited by 13
Förstner, P., & Knöll, B. (2020) · The FASEB Journal · doi:10.1096/fj.201902257rr · Cited by 18
Basso, M., & Milelli, A. (2019) · Current Opinion in Neurology · doi:10.1097/wco.0000000000000753 · Cited by 13
“ondary death response are glutamate excitotoxicity, neuroinflammation, mitochondrial dysfunction and altered gene transcription [1].”
BackgroundAllen, J., Pham, L., Bond, S., O'Brien, W. T., Spitz, G., Shultz, S., Drew, B., Wright, D. K., & McDonald, S. (2023) · Frontiers in Molecular Neuroscience · doi:10.3389/fnmol.2023.1208697 · Cited by 12
Wang, Z., Luo, C.-L., Zhou, E. W., Sandhu, A. F., Yuan, X.-J., Williams, G. E., Cheng, J., Sinha, B., Akbar, M., Bhattacharya, P., et al. (2023) · International Journal of Molecular Sciences · doi:10.3390/ijms24108805 · Cited by 11
“The coordination of glutamate release and uptake is critical to regulating synaptic strength, long-term potentiation, depression, and cognitive processes in chronic TBI [97].”
BackgroundChaoul, V., Awad, M., Harb, F., Najjar, F., Hamadé, A., Nabout, R. A. E., & Soueid, J. (2022) · International Journal of Molecular Sciences · doi:10.3390/ijms231911600 · Cited by 11
“secondary insult [8], leading to an increased level of intracellular calcium.”
BackgroundKarimi, S. A., Hosseinmardi, N., Sayyah, M., Hajisoltani, R., & Janahmadi, M. (2020) · Hippocampus · doi:10.1002/hipo.23270 · Cited by 18
“early stages of TBI induction, extracellular glutamate levels increase (Cantu et al., 2014; Dorsett et al., 2017; Hinzman et al., 2010), this, in turn, may cause a reduction in Ih current and thereby promote neuronal hyperexcitability (Balakrishnan & Mironov, 2018).”
BackgroundChoi, J., Do, Y., & Lee, H. (2024) · Diagnostics · doi:10.3390/diagnostics14222606 · Cited by 10
“Post-brain-injury changes in neurotransmitter levels cause pathological changes in the fascia [13].”
NMDAR (2C) deletion in astrocytes relieved LPS-induced neuroinflammation and depression
Gao, R., Ali, T., Liu, Z., Li, A., He, K., Yang, C., Feng, J., & Li, S. (2024) · International Immunopharmacology · doi:10.1016/j.intimp.2024.111964 · Cited by 10
Langlois, L. D., Selvaraj, P., Simmons, S. C., Gouty, S., Zhang, Y., & Nugent, F. S. (2022) · IBRO Neuroscience Reports · doi:10.1016/j.ibneur.2022.02.002 · Cited by 15
“158 the long-term impairment of cognitive function following TBI may be attributable to an imbalance of synaptic transmission following a persistent deficit in extracellular glutamate regulation resulting in prolonged elevated levels of glutamate at synapses (Dorsett et al., 2017).”
BackgroundBaker, T. L., Sun, M., Semple, B. D., Tyebji, S., Tonkin, C. J., Mychasiuk, R., & Shultz, S. R. (2020) · Journal of Neuroinflammation · doi:10.1186/s12974-020-01885-3 · Cited by 11
The roles of neuroinflammation and glutamatergic excitotoxicity in treatment-resistant depression
Candee, R., Wilkenson, R., Schreiber, M., & Decenzo, M. (2023) · JAAPA : official journal of the American Academy of Physician Assistants · doi:10.1097/01.jaa.0000921252.57819.4b · Cited by 9
Unveiling Leukocyte Extracellular Traps in Inflammatory Responses of the Central Nervous System
Colciaghi, F., & Costanza, M. (2022) · Frontiers in Immunology · doi:10.3389/fimmu.2022.915392 · Cited by 9
Grebenchikov, O., Shabanov, A., Nikolayev, L. L., Shpichko, A., Bratishchev, I. V., Marchenko, L., Khusainov, S. Z., Cherpakov, R., & Shpichko, N. P. (2021) · Russian Sklifosovsky Journal "Emergency Medical Care" · doi:10.23934/2223-9022-2021-10-3-511-520 · Cited by 9
Kyllo, T., Allocco, D., Hei, L. V., Wulff, H., & Erickson, J. D. (2024) · Frontiers in Pharmacology · doi:10.3389/fphar.2024.1466953 · Cited by 9
The mGluR5‐mediated Arc activation protects against experimental traumatic brain injury in rats
Chen, T., Li, Y.-F., Ren, X., & Wang, Y.-H. (2024) · CNS Neuroscience & Therapeutics · doi:10.1111/cns.14695 · Cited by 8
“6 In human, elevated levels of glutamate in cerebrospinal fluid (CSF) can be observed after TBI, which might persist for days and weeks.”
Li, M., Huo, X., Wang, Y., Li, W., Xiao, L., Jiang, Z.-F., Han, Q., Su, D., Chen, T., & Xia, H. (2022) · Frontiers in Pharmacology · doi:10.3389/fphar.2022.1021653 · Cited by 8
“This is known as secondary injury (Winkler et al., 2016; Dorsett et al., 2017; Simon et al., 2017; Sorby-Adams et al., 2017).”
Li, L., Zhou, J.-P., Han, L.-Y., Guo, C., Ma, S.-Y., Ge, S.-N., & Qu, Y. (2024) · NeuroReport · doi:10.1097/wnr.0000000000002032 · Cited by 7
Trends and hotspots in research of traumatic brain injury from 2000 to 2022: A bibliometric study
Long, Y.-R., Zhao, K., Zhang, F.-C., Li, Y., Wang, J., Niu, H., & Lei, J. (2023) · Neurochemistry International · doi:10.1016/j.neuint.2023.105646 · Cited by 7
Chalcone-Derived Nrf2 Activator Protects Cognitive Function via Maintaining Neuronal Redox Status
Cui, Y., Xiong, Y., Li, H., Zeng, M., Wang, Y., Li, Y., Zou, X., Lv, W., Gao, J., Cao, R., et al. (2021) · Antioxidants · doi:10.3390/antiox10111811 · Cited by 8
Herzog, C. M. S., Greenald, D., Larraz, J., Keatinge, M., & Herrgen, L. (2020) · Biology Open · doi:10.1242/bio.050260 · Cited by 7
“With NMDA receptors acting as key mediators of excitotoxicity (Dorsett et al., 2017), it is plausible that polyamines could regulate excitotoxic cell death after acute neural injury.”
BackgroundD’Mello, V., Subramaniam, M., Bhalla, A. P., Saavedra, S., Leiba, O., & Levison, S. (2023) · Neurotrauma Reports · doi:10.1089/neur.2021.0075 · Cited by 6
“34,35 This scenario is reminiscent of pre-conditioning where a mild insult subsequently reduces the extent of injury induced by more severe injury, which correlates with increased expression of GFAP, glutamine synthetase, GLAST, monocarboxylate transporter-1, and ceruloplasmin.”
Ling, D. S. F., Yang, L., & Goodman, J. (2022) · Epilepsia · doi:10.1111/epi.17167 · Cited by 6
Papalia, W. L., Nascimento, A. S., Krishna, G., Cunha, N. B., Furian, A. F., Oliveira, M. S., Royes, L. F. F., & Fighera, M. R. (2021) · Molecular Neurobiology · doi:10.1007/s12035-021-02639-9 · Cited by 6
“After TBI, the excitotoxicity evidenced by extracellular glutamate increase is a major contributing factor in apoptosis and neuronal death [52, 53].”
BackgroundBinaafar, S., Razmara, E., Mahdieh, N., Sahebjame, H., Tavasoli, A., & Garshasbi, M. (2020) · European Journal of Medical Genetics · doi:10.1016/j.ejmg.2020.103853 · Cited by 6
Talty, C.-E., Murphy, S. F., & VandeVord, P. J. (2024) · Neuroscience · doi:10.1016/j.neuroscience.2024.09.039 · Cited by 6
“Glutamate excitotoxicity is a well-studied consequence of TBI which involves mass amounts of glutamate efflux into the synapse upon the mechanical force of injury (Dorsett et al., 2017; Giza and Hovda, 2014).”
Jacotte-Simancas, A., Middleton, J. W., Stielper, Z. F., Edwards, S., Molina, P. E., & Gilpin, N. W. (2022) · Journal of Neurotrauma · doi:10.1089/neu.2021.0270 · Cited by 4
“61,62 Diffuse injury results in widespread damage in the brain that affects axons, vasculature, and hypoxia.”
Zheng, H., Tian, X., Wang, Y., Ye, X., Ren, X., Gu, Y., Wang, J., Zheng, G., & Yang, X. (2025) · Pharmacological Research · doi:10.1016/j.phrs.2025.108034 · Cited by 5
Forouzanfar, F., Ahmadzadeh, A. M., Pourbagher‐Shahri, A. M., & Gorji, A. (2025) · European Journal of Pharmacology · doi:10.1016/j.ejphar.2025.177690 · Cited by 4
Ji, T., Pang, Y., Cheng, M., Wang, R., Chen, X., Zhang, C., Liu, M., Zhang, J., & Zhong, C. (2023) · iScience · doi:10.1016/j.isci.2023.107913 · Cited by 5
Metadata
- Authors
- Dorsett, C. R., McGuire, J. L., DePasquale, E. A. K., Gardner, A. E., Floyd, C. L., & McCullumsmith, R. E.
- Affiliations
- University of North Carolina at Chapel Hill (US)
- University of Cincinnati (US)
- University of Alabama at Birmingham (US)
- Corresponding author
- McCullumsmith, Robert E.
- Venue
- Journal of Neurotrauma
- Publisher
- SAGE Publications
- Published
- 2017-01
- Volume
- 34
- Issue
- 2
- Pages
- 263-272
- ISSN
- 0897-7151 (ISSN-L)
- 1557-9042
- PMC
- PMC5220558
- OpenAlex
- W2494112084
- Cited by
- 163
- References
- 0
- Citations by year
- 2026: 15 · 2025: 11 · 2024: 26 · 2023: 16 · 2022: 22 · 2021: 22 · 2020: 16 · 2019: 15 · 2018: 12 · 2017: 6
- FWCI
- 1.57
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Journal of Neurotrauma (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Carolina Digital Repository (University of North Carolina at Chapel Hill) (submittedVersion)
- UNC Libraries
- Funders
- National Institute of Mental Health (R01MH094445, R01MH107487)
- National Institute of Neurological Disorders and Stroke (R01NS075162)
- Topics
- Health Sciences › Medicine › Clinical Neurology › Traumatic Brain Injury and Neurovascular Disturbances
- Health Sciences › Medicine › Clinical Neurology › Traumatic Brain Injury Research
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Keywords
- traumatic brain injury, glutamatergic neurotransmission, glutamate transporters, glutamate homeostasis, secondary injury, excitotoxicity, synaptic transmission, long-term potentiation and depression, rodent models
- MeSH terms
- Brain Injuries, Traumatic, Animals, Disease Models, Animal, Humans, Synaptic Transmission, Neuroglia, Rodentia, Synapses, Signal Transduction, Glutamic Acid, Glutamate Plasma Membrane Transport Proteins, Mice, Rats
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