Full Text Journal Articles by
Author Mujun Sun

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Diffusion Imaging Reveals Sex Differences in the White Matter Following Sports-Related Concussion.

David K Wright, Georgia F Symons, William T O'Brien, Stuart J McDonald, Akram Zamani, Brendan Major, Zhibin Chen, Daniel Costello, Rhys D Brady, Mujun Sun, Meng Law, Terence J O'Brien, Richelle Mychasiuk, Sandy R Shultz,

Sports-related concussion (SRC) is a serious health concern. However, the temporal profile of neuropathophysiological changes after SRC and how these relate to biological sex are still poorly understood. This preliminary study investigated whether diffusion-weighted magnetic resonance imaging (dMRI) was sensitive to neuropathophysiological changes following SRC; whether these changes were sex-specific; ... Read more >>

Cereb Cortex (Cerebral cortex (New York, N.Y. : 1991))
[2021, 31(10):4411-4419]

Cited: 1 time

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Gut microbiome depletion and repetitive mild traumatic brain injury differentially modify bone development in male and female adolescent rats.

Ker Rui Wong, Marissa Sgro, Glenn R Yamakawa, Crystal Li, Stuart J McDonald, Mujun Sun, Sandy R Shultz, Rhys D Brady, Richelle Mychasiuk,

Dysregulation of the gut microbiome has been shown to disrupt both bone formation and bone resorption in several preclinical and clinical models. However, the role of microbiome in adolescent bone development remains poorly understood. This effect of disrupted bone development may be more pronounced during adolescence, when bone development is ... Read more >>

Bone Rep (Bone reports)
[2021, 15:101123]

Cited: 0 times

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Targeting the Cerebrovascular System: Next-Generation Biomarkers and Treatment for Mild Traumatic Brain Injury.

Tamara L Baker, Denes V Agoston, Rhys D Brady, Brendan Major, Stuart J McDonald, Richelle Mychasiuk, David K Wright, Glenn R Yamakawa, Mujun Sun, Sandy R Shultz,

The diagnosis, prognosis, and treatment of mild traumatic brain injuries (mTBIs), such as concussions, are significant unmet medical issues. The kinetic forces that occur in mTBI adversely affect the cerebral vasculature, making cerebrovascular injury (CVI) a pathophysiological hallmark of mTBI. Given the importance of a healthy cerebrovascular system in overall ... Read more >>

Neuroscientist (The Neuroscientist : a review journal bringing neurobiology, neurology and psychiatry)
[2021, :10738584211012264]

Cited: 0 times

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Temporal profile and utility of serum neurofilament light in a rat model of mild traumatic brain injury.

William T O'Brien, Louise Pham, Rhys D Brady, Jesse Bain, Glenn R Yamakawa, Mujun Sun, Richelle Mychasiuk, Terence J O'Brien, Mastura Monif, Sandy R Shultz, Stuart J McDonald,

There is a widely recognized need for blood biomarkers to assist clinical decisions surrounding mild traumatic brain injury (mTBI). Serum neurofilament light (NfL), an indicator of neuroaxonal damage, is one such candidate, with early mTBI clinical investigations demonstrating significant promise. To facilitate the translation of pre-clinical mTBI findings, clinically relevant ... Read more >>

Exp Neurol (Experimental neurology)
[2021, 341:113698]

Cited: 1 time

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A systemic immune challenge to model hospital-acquired infections independently regulates immune responses after pediatric traumatic brain injury.

Rishabh Sharma, Akram Zamani, Larissa K Dill, Mujun Sun, Erskine Chu, Marcus J Robinson, Terence J O'Brien, Sandy R Shultz, Bridgette D Semple,

<h4>Background</h4>Traumatic brain injury (TBI) is a major cause of disability in young children, yet the factors contributing to poor outcomes in this population are not well understood. TBI patients are highly susceptible to nosocomial infections, which are mostly acquired within the first week of hospitalization, and such infections may modify ... Read more >>

J Neuroinflammation (Journal of neuroinflammation)
[2021, 18(1):72]

Cited: 0 times

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Pain in the Developing Brain: Early Life Factors Alter Nociception and Neurobiological Function in Adolescent Rats.

Sabrina Salberg, Glenn R Yamakawa, Yannick Griep, Jesse Bain, Jaimie K Beveridge, Mujun Sun, Stuart J McDonald, Sandy R Shultz, Rhys D Brady, David K Wright, Melanie Noel, Richelle Mychasiuk,

Although adverse early experiences prime individuals to be at increased risk for chronic pain, little research has examined the trauma-pain relationship in early life or the underlying mechanisms that drive pathology over time. Given that early experiences can potentiate the nociceptive response, this study aimed to examine the effects of ... Read more >>

Cereb Cortex Commun (Cerebral cortex communications)
[2021, 2(2):tgab014]

Cited: 0 times

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Contrast enhanced magnetic resonance imaging highlights neurovasculature changes following experimental traumatic brain injury in the rat.

David K Wright, Jamie N Mayo, Mujun Sun, Terence J O'Brien, Sandy R Shultz,

Neurovascular injury has been proposed as a universal pathological hallmark of traumatic brain injury (TBI) with molecular markers of angiogenesis and endothelial function associated with injury severity and morbidity. Sex differences in the neurovasculature response post-TBI may contribute to the differences seen in how males and females respond to injury. ... Read more >>

Sci Rep (Scientific reports)
[2020, 10(1):21252]

Cited: 0 times

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Behavioral, axonal, and proteomic alterations following repeated mild traumatic brain injury: Novel insights using a clinically relevant rat model.

Louise Pham, David K Wright, William T O'Brien, Jesse Bain, Cheng Huang, Mujun Sun, Pablo M Casillas-Espinosa, Anup D Shah, Ralf B Schittenhelm, Christopher G Sobey, Rhys D Brady, Terence J O'Brien, Richelle Mychasiuk, Sandy R Shultz, Stuart J McDonald,

A history of mild traumatic brain injury (mTBI) is linked to a number of chronic neurological conditions, however there is still much unknown about the underlying mechanisms. To provide new insights, this study used a clinically relevant model of repeated mTBI in rats to characterize the acute and chronic neuropathological ... Read more >>

Neurobiol Dis (Neurobiology of disease)
[2021, 148:105151]

Cited: 4 times

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Experimental traumatic brain injury does not lead to lung infection.

Mujun Sun, Rhys D Brady, Brooke Wanrooy, Richelle Mychasiuk, Glenn R Yamakawa, Pablo M Casillas-Espinosa, Connie H Y Wong, Sandy R Shultz, Stuart J McDonald,

Traumatic brain injury (TBI) patients often experience post-traumatic infections, especially in the lung. Pulmonary infection is associated with unfavorable outcomes and increased mortality rates in TBI patients; however, our understanding of the underlying mechanisms is poor. Here we used a lateral fluid percussion injury (LFPI) model in rats to investigate ... Read more >>

J Neuroimmunol (Journal of neuroimmunology)
[2020, 343:577239]

Cited: 1 time

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Beyond the Brain: Peripheral Interactions after Traumatic Brain Injury.

Stuart J McDonald, Jessica M Sharkey, Mujun Sun, Lola M Kaukas, Sandy R Shultz, Renee J Turner, Anna V Leonard, Rhys D Brady, Frances Corrigan,

Traumatic brain injury (TBI) is a leading cause of death and disability, and there are currently no pharmacological treatments known to improve patient outcomes. Unquestionably, contributing toward a lack of effective treatments is the highly complex and heterogenous nature of TBI. In this review, we highlight the recent surge of ... Read more >>

J Neurotrauma (Journal of neurotrauma)
[2020, 37(5):770-781]

Cited: 20 times

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A novel rat model of heterotopic ossification after polytrauma with traumatic brain injury.

Rhys D Brady, Michael Z Zhao, Ker R Wong, Pablo M Casilla-Espinosa, Glenn R Yamakawa, Ryan C Wortman, Mujun Sun, Brian L Grills, Richelle Mychasiuk, Terence J O'Brien, Denes V Agoston, Peter V S Lee, Stuart J McDonald, Dale L Robinson, Sandy R Shultz,

Neurological heterotopic ossification (NHO) is characterized by abnormal bone growth in soft tissue and joints in response to injury to the central nervous system. The ectopic bone frequently causes pain, restricts mobility, and decreases the quality of life for those affected. NHO commonly develops in severe traumatic brain injury (TBI) ... Read more >>

Bone (Bone)
[2020, 133:115263]

Cited: 2 times

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The need to incorporate aged animals into the preclinical modeling of neurological conditions.

Mujun Sun, Stuart J McDonald, Rhys D Brady, Lyndsey Collins-Praino, Glenn R Yamakawa, Mastura Monif, Terence J O'Brien, Geoffrey C Cloud, Christopher G Sobey, Richelle Mychasiuk, David J Loane, Sandy R Shultz,

Neurological conditions such as traumatic brain injury, stroke, Parkinson's disease, epilepsy, multiple sclerosis, and Alzheimer's disease are serious clinical problems that affect millions of people worldwide. The majority of clinical trials for these common conditions have failed, and there is a critical need to understand why treatments in preclinical animal ... Read more >>

Neurosci Biobehav Rev (Neuroscience and biobehavioral reviews)
[2020, 109:114-128]

Cited: 7 times

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Repeated mild traumatic brain injuries induce persistent changes in plasma protein and magnetic resonance imaging biomarkers in the rat.

David K Wright, Rhys D Brady, Alaa Kamnaksh, Jack Trezise, Mujun Sun, Stuart J McDonald, Richelle Mychasiuk, Scott C Kolbe, Meng Law, Leigh A Johnston, Terence J O'Brien, Denes V Agoston, Sandy R Shultz,

A single mild traumatic brain injury (mTBI) typically causes only transient symptoms, but repeated mTBI (RmTBI) is associated with cumulative and chronic neurological abnormalities. Clinical management of mTBI is challenging due to the heterogeneous, subjective and transient nature of symptoms, and thus would be aided by objective biomarkers. Promising biomarkers ... Read more >>

Sci Rep (Scientific reports)
[2019, 9(1):14626]

Cited: 5 times

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Aged rats have an altered immune response and worse outcomes after traumatic brain injury.

Mujun Sun, Rhys D Brady, Pablo M Casillas-Espinosa, David K Wright, Bridgette D Semple, Hyun Ah Kim, Richelle Mychasiuk, Christopher G Sobey, Terence J O'Brien, Antony Vinh, Stuart J McDonald, Sandy R Shultz,

Initial studies suggest that increased age is associated with worse outcomes after traumatic brain injury (TBI), though the pathophysiological mechanisms responsible for this remain unclear. Immunosenescence (i.e., dysregulation of the immune system due to aging) may play a significant role in influencing TBI outcomes. This study therefore examined neurological outcomes ... Read more >>

Brain Behav Immun (Brain, behavior, and immunity)
[2019, 80:536-550]

Cited: 4 times

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Bone Health in Rats With Temporal Lobe Epilepsy in the Absence of Anti-Epileptic Drugs.

Rhys D Brady, Ker Rui Wong, Dale L Robinson, Richelle Mychasiuk, Stuart J McDonald, Ryan A D'Cunha, Glenn R Yamakawa, Mujun Sun, John D Wark, Peter Vee Sin Lee, Terence J O'Brien, Pablo M Casillas-Espinosa, Sandy R Shultz,

<b>Rationale:</b> Epilepsy patients often exhibit reduced bone mineral density and are at an increased risk of bone fracture. Whether these bone abnormalities are due to the use of anti-epileptic drugs (AED's) or the disease itself is unknown. For example, although decreased bone health in epilepsy patients is generally attributed to ... Read more >>

Front Pharmacol (Frontiers in pharmacology)
[2019, 10:1278]

Cited: 0 times

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Targeting high-mobility group box protein 1 (HMGB1) in pediatric traumatic brain injury: Chronic neuroinflammatory, behavioral, and epileptogenic consequences.

Kyria M Webster, Sandy R Shultz, Ezgi Ozturk, Larissa K Dill, Mujun Sun, Pablo Casillas-Espinosa, Nigel C Jones, Peter J Crack, Terence J O'Brien, Bridgette D Semple,

High mobility group box protein-1 (HMGB1) has been implicated as a key mediator of neuroinflammation and neurodegeneration in a range of neurological conditions including traumatic brain injury (TBI) and epilepsy. To date, however, most studies have examined only acute outcomes, and the adult brain. We have recently demonstrated HMGB1 release ... Read more >>

Exp Neurol (Experimental neurology)
[2019, 320:112979]

Cited: 16 times

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The genetic ablation of tau improves long-term, but not short-term, functional outcomes after experimental traumatic brain injury in mice.

Xin Lin Tan, Ping Zheng, David K Wright, Mujun Sun, Rhys D Brady, Shijie Liu, Stuart J McDonald, Richelle Mychasiuk, Sitare Cenap, Nigel C Jones, Terence J O'Brien, Sandy R Shultz,

<h4>Primary objective</h4>This study characterized the acute and chronic effects of tau reduction in traumatic brain injury (TBI).<h4>Research design</h4>A fluid percussion injury (FPI) or a sham-injury was administered to wild type (WT) or tau knockout (Tau-/-) mice. Mice were assigned to a one-week or twelve-week recovery period before behavioral testing and ... Read more >>

Brain Inj (Brain injury)
[2020, 34(1):131-139]

Cited: 3 times

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Inhibitory neuronal changes following a mixed diffuse-focal model of traumatic brain injury.

Simone F Carron, Mujun Sun, Sandy R Shultz, Ramesh Rajan,

Traumatic brain injury (TBI) can result in excitation: inhibition imbalance, as well as a range of chronic neurological deficits. However, how TBI affects different interneurons, and how this relates to behavioral abnormalities, remains poorly understood. This study examined the effects of a mixed diffuse-focal model of TBI, the lateral fluid ... Read more >>

J Comp Neurol (The Journal of comparative neurology)
[2020, 528(2):175-198]

Cited: 2 times

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Age-dependent release of high-mobility group box protein-1 and cellular neuroinflammation after traumatic brain injury in mice.

Kyria M Webster, Mujun Sun, Peter J Crack, Terence J O'Brien, Sandy R Shultz, Bridgette D Semple,

Accumulating research suggests that children may be more vulnerable to poor long-term outcomes after traumatic brain injury (TBI) compared to adults. The neuroinflammatory response, known to contribute to neuropathology after TBI, appears to differ depending upon age-at-insult, although this response has not been well-characterized. Elevated levels of a key initiator ... Read more >>

J Comp Neurol (The Journal of comparative neurology)
[2019, 527(6):1102-1117]

Cited: 10 times

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A Concomitant Muscle Injury Does Not Worsen Traumatic Brain Injury Outcomes in Mice.

Mujun Sun, Rhys D Brady, Chris van der Poel, Danielle Apted, Bridgette D Semple, Jarrod E Church, Terence J O'Brien, Stuart J McDonald, Sandy R Shultz,

Traumatic brain injury (TBI) often involves multitrauma in which concurrent extracranial injury occurs. We previously demonstrated that a long bone fracture exacerbates neuroinflammation and functional outcomes in mice given a TBI. Whether other forms of concomitant peripheral trauma that are common in the TBI setting, such as skeletal muscle injury, ... Read more >>

Front Neurol (Frontiers in neurology)
[2018, 9:1089]

Cited: 4 times

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Transactive Response DNA-Binding Protein 43 Abnormalities after Traumatic Brain Injury.

Xin Lin Tan, Mujun Sun, Rhys D Brady, Shijie Liu, Roxana Llanos, Steve Cheung, David K Wright, Pablo M Casillas-Espinosa, Maithili Sashindranath, Terence J O'Brien, Stuart J McDonald, Bradley J Turner, Sandy R Shultz,

Initial studies have found some evidence for transactive response DNA-binding protein 43 (TDP-43) abnormalities after traumatic brain injury (TBI), and the presence of protein inclusions consisting of TDP-43 are a pathological hallmark of amyotrophic lateral sclerosis (ALS), a condition associated with TBI. However, no study has characterized changes in TDP-43 ... Read more >>

J Neurotrauma (Journal of neurotrauma)
[2018, :]

Cited: 8 times

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The influence of immunological stressors on traumatic brain injury.

Mujun Sun, Stuart J McDonald, Rhys D Brady, Terence J O'Brien, Sandy R Shultz,

Traumatic brain injury (TBI) is a leading cause of death and disability worldwide, and typically involves a robust immune response. Although a great deal of preclinical research has been conducted to identify an effective treatment, all phase III clinical trials have been unsuccessful to date. These translational shortcomings are in ... Read more >>

Brain Behav Immun (Brain, behavior, and immunity)
[2018, 69:618-628]

Cited: 11 times

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Gambogic amide, a selective TrkA agonist, does not improve outcomes from traumatic brain injury in mice.

Maddison R Johnstone, Mujun Sun, Caroline J Taylor, Rhys D Brady, Brian L Grills, Jarrod E Church, Sandy R Shultz, Stuart J McDonald,

<h4>Objectives</h4>There is evidence that treatment with nerve growth factor (NGF) may reduce neuroinflammation and apoptosis after a traumatic brain injury (TBI). NGF is thought to exert its effects via binding to either TrkA or p75 neurotrophin receptors. This study aimed to investigate the effects of a selective TrkA agonist, gambogic ... Read more >>

Brain Inj (Brain injury)
[2018, 32(2):257-268]

Cited: 8 times

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Treatment with an interleukin-1 receptor antagonist mitigates neuroinflammation and brain damage after polytrauma.

Mujun Sun, Rhys D Brady, David K Wright, Hyun Ah Kim, Shenpeng R Zhang, Christopher G Sobey, Maddison R Johnstone, Terence J O'Brien, Bridgette D Semple, Stuart J McDonald, Sandy R Shultz,

Traumatic brain injury (TBI) and long bone fracture are common in polytrauma. This injury combination in mice results in elevated levels of the pro-inflammatory cytokine interleukin-1β (IL-1β) and exacerbated neuropathology when compared to isolated-TBI. Here we examined the effect of treatment with an IL-1 receptor antagonist (IL-1ra) in mice given ... Read more >>

Brain Behav Immun (Brain, behavior, and immunity)
[2017, 66:359-371]

Cited: 35 times

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Inflammation in epileptogenesis after traumatic brain injury.

Kyria M Webster, Mujun Sun, Peter Crack, Terence J O'Brien, Sandy R Shultz, Bridgette D Semple,

<h4>Background</h4>Epilepsy is a common and debilitating consequence of traumatic brain injury (TBI). Seizures contribute to progressive neurodegeneration and poor functional and psychosocial outcomes for TBI survivors, and epilepsy after TBI is often resistant to existing anti-epileptic drugs. The development of post-traumatic epilepsy (PTE) occurs in a complex neurobiological environment characterized ... Read more >>

J Neuroinflammation (Journal of neuroinflammation)
[2017, 14(1):10]

Cited: 66 times

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