scholarly journals Role of 5-HT in Cerebral Edema after Traumatic Brain Injury

2021 ◽  
Author(s):  
Priya Badyal ◽  
Jaspreet Kaur ◽  
Anurag Kuhad
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Nervous Tissue ◽  
Closed Head Injury ◽  
Cell Swelling ◽  
Volume Swelling ◽  
Cell Changes ◽  
Primary Injury ◽  
The Brain

The pathogenesis of edema after traumatic brain injury is complex including the destruction of micro-vessels and alterations in microcirculation around the primary injury and leakage of plasma constituents into the tissue, due to permeability changes of the vessel walls. Many functional molecules like histamine, serotonin, arachidonic acid, prostaglandins and thromboxane have been shown to induce blood–brain barrier (BBB) disruption or cell swelling. It is believed that released 5-HT binds to 5-HT2 receptors stimulating cAMP and prostaglandins in vessels that cause more vesicular transport in endothelial cells leading to serum component’s extravasation. The additional amount of serotonin into the tissue due to injury maintains the state of increased vascular permeability that ultimately causes edema. Serotonin is clearly involved in early cytotoxic edema after TBI. Reduction of serotonin in the nervous tissue reduces swelling and the milder cell changes in the brain or spinal cord of traumatized rats. Inhibition of serotonin synthesis before closed head injury (CHI) in rat models or administration of serotonin antiserum after injury attenuates BBB disruption and brain edema volume swelling, and brain pathology. Maintaining low serotonin levels immediately after injury may show neuroprotection and combat various secondary outcomes that occur after traumatic brain injury.

Potential Role of Adult Hippocampal Neurogenesis in Traumatic Brain Injury

2021 ◽  
Vol 28 ◽  
Author(s):  
Lucas Alexandre Santos Marzano ◽  
Fabyolla Lúcia Macedo de Castro ◽  
Caroline Amaral Machado ◽  
João Luís Vieira Monteiro de Barros ◽  
Thiago Macedo e Cordeiro ◽  
...  
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Clinical Studies ◽  
Molecular Mechanisms ◽  
Hippocampal Neurogenesis ◽  
Cognitive Outcomes ◽  
Adult Hippocampal Neurogenesis ◽  
The Brain

: Traumatic brain injury (TBI) is a serious cause of disability and death among young and adult individuals, displaying complex pathophysiology including cellular and molecular mechanisms that are not fully elucidated. Many experimental and clinical studies investigated the potential relationship between TBI and the process by which neurons are formed in the brain, known as neurogenesis. Currently, there are no available treatments for TBI’s long-term consequences being the search for novel therapeutic targets, a goal of highest scientific and clinical priority. Some studies evaluated the benefits of treatments aimed at improving neurogenesis in TBI. In this scenario, herein, we reviewed current pre-clinical studies that evaluated different approaches to improving neurogenesis after TBI while achieving better cognitive outcomes, which may consist in interesting approaches for future treatments.

Sa2015 Traumatic Brain Injury and Intestinal Dysfunction: Investigating a Putative Role of the Brain-Gut Axis in Long-Term Consequences of Injury

2015 ◽  
Vol 148 (4) ◽  
pp. S-384
Author(s):  
Elise L. Ma ◽  
Allen Smith ◽  
Neemesh Desai ◽  
Alan Faden ◽  
Terez Shea-Donohue
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Putative Role ◽  
Long Term Consequences ◽  
The Brain

scholarly journals Role of Thalamus in Recovery of Traumatic Brain Injury

2016 ◽  
Vol 07 (S 01) ◽  
pp. S076-S079 ◽  
Author(s):  
Ashok Munivenkatappa ◽  
Amit Agrawal
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Brain Structures ◽  
Thalamic Nuclei ◽  
Posttraumatic Symptoms ◽  
Injured Brain ◽  
Recovery Mechanisms ◽  
The Brain ◽  
Degree Of Recovery

ABSTRACTDegree of recovery after traumatic brain injury is highly variable that lasts for many weeks to months. The evidence of brain structures involved in recovery mechanisms is limited. This review highlights evidence of the brain structure particularly thalamus in neuroplasticity mechanism. Thalamus with its complex global networking has potential role in refining the cortical and other brain structures. Thalamic nuclei activation both naturally or by neurorehabilitation in injured brain can enhance and facilitate the improvement of posttraumatic symptoms. This review provides evidence from literature that thalamus plays a key role in recovery mechanism after injury. The study also emphasize that thalamus should be specifically targeted in neurorehabilitation following brain injury.

The Link Between Traumatic Brain Injury and Neurodegenerative Diseases

Neurotrauma ◽  
2018 ◽  
pp. 165-180
Author(s):  
Richard Rubenstein
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Neurodegenerative Diseases ◽  
Clinical Symptoms ◽  
Chronic Traumatic Encephalopathy ◽  
Closed Head Injury ◽  
Secondary Injury ◽  
The Central Nervous System ◽  
Physical Impact ◽  
Primary Injury

Traumatic brain injury (TBI) is a physical impact to the head usually in the form of a single or repetitive closed head injury. TBI is classified as mild, moderate, and severe based on neurological assessment which may include neuroimaging. TBI is a heterogeneous injury, with most cases being mild and difficult to diagnose. TBI can be separated into a primary injury and secondary injury. Primary injury is a result of the physical head impact, whereas secondary injury can occur as long as months to years later and is the result of pathophysiological changes in the central nervous system. TBI is considered a risk factor for chronic neurodegenerative diseases (Alzheimer disease, Parkinson disease, amyotrophic lateral sclerosis, frontotemporal dementia, chronic traumatic encephalopathy) in spite of each disease having unique clinical symptoms, pathologies, and specific discriminating proteins. To date, little is known about the pathological changes responsible for linking TBI to neurodegenerative diseases.

The role of estrogen and progesterone, administered alone and in combination, in modulating cytokine concentration following traumatic brain injury

2011 ◽  
Vol 89 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Mohammad Khaksari ◽  
Zahra Soltani ◽  
Nader Shahrokhi ◽  
Gholamreza Moshtaghi ◽  
Gholamreza Asadikaram
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Water Content ◽  
Treated Group ◽  
Inhibitory Effect ◽  
Ovariectomized Rats ◽  
Brain Level ◽  
The Brain ◽  
Brain Water

Cytokines play an important role in the pathophysiology of traumatic brain injury (TBI). This study was designed to determine the effects of administering progesterone (P) and estrogen (E), alone and in combination, on brain water content, blood–brain barrier (BBB) disturbance, and brain level of cytokines following diffuse TBI. Ovariectomized rats were divided into 9 groups, treated with vehicle, E1, E2, P1, P2, E1+P1, E1+P2, E2+P1, and E2+P2. Levels of BBB disruption (5 h), cytokines, and water content (24 h) were evaluated after TBI induced by the Marmarou method. Physiological (E1 and P1) and pharmacological (E2 and P2) doses of estrogen and progesterone were administered 30 min after TBI. Water content in the E1+P2-treated group was higher than in the E1-treated group. The inhibitory effect of E2 on water content was reduced by adding progesterone. The inhibitory effect of E1 and E2 on Evans blue content was reduced by treatment with E1+P1 and E2+P2, respectively. The brain level of IL-1β was reduced in E1 and E2, after TBI. In the E2+P2-treated group, this level was higher than in the E2-treated group. The brain level of TGF-β was also elevated by the administration of progesterone and estrogen alone, and reduced when the hormones were administered in combination. In conclusion, a combined administration of progesterone and estrogen inhibited the decreasing effects of administration of progesterone and estrogen alone on water content and BBB disruption that mediated to change the proinflammatory cytokines.

scholarly journals Relevance of Blood Vessel Networks in Blast-Induced Traumatic Brain Injury

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Yi Hua ◽  
Shengmao Lin ◽  
Linxia Gu
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Blood Vessel ◽  
Vessel Diameter ◽  
Dynamic Responses ◽  
Brain Dynamics ◽  
Cerebral Vasculature ◽  
Vessel Networks ◽  
The Brain

Cerebral vasculature is a complex network that circulates blood through the brain. However, the role of this networking effect in brain dynamics has seldom been inspected. This work is to study the effects of blood vessel networks on dynamic responses of the brain under blast loading. Voronoi tessellations were implemented to represent the network of blood vessels in the brain. The brain dynamics in terms of maximum principal strain (MPS), shear strain (SS), and intracranial pressure (ICP) were monitored and compared. Results show that blood vessel networks significantly affected brain responses. The increased MPS and SS were observed within the brain embedded with vessel networks, which did not exist in the case without blood vessel networks. It is interesting to observe that the alternation of the ICP response was minimal. Moreover, the vessel diameter and density also affected brain dynamics in both MPS and SS measures. This work sheds light on the role of cerebral vasculature in blast-induced traumatic brain injury.

scholarly journals Clinical and epidemiological analysis of severe traumatic brain injury: the role of nutritional support to the injured with a prolonged state of impaired consciousness

2020 ◽  
pp. 32-43
Author(s):  
M. V. Nikiforov ◽  
A. A. Korolev
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Nutritional Support ◽  
The Body ◽  
Medical Rehabilitation ◽  
Impaired Consciousness ◽  
Epidemiological Analysis ◽  
The Brain

Relevance. Patients with prolonged impaired consciousness due to traumatic brain injury are the most difficult category of patients in inpatient medical rehabilitation units. Despite the experience gained in managing this complex category of patients, the problem of nutrition status and trophological insufficiency, as well as practical issues regarding the organization of optimal nutrition at this stage of medical rehabilitation remain unresolved.Intention. To study the role of nutritional support for patients with long-term impaired consciousness on the basis of a clinical and epidemiological analysis of severe traumatic brain injury.Methodology. The data of an epidemiological analysis of traumatic brain injuries and features of ongoing nutritional support in patients with long-term impaired consciousness are presented, based on a study of domestic and foreign publications from 2005 to 2019.Results and Discussion. Timely and adequate nutritional support optimizes the structural-functional and metabolic systems of the body, adaptive reserves interfere with rapidly progressive depletion and chronic catabolic processes, contribute to positive changes in the functional state of the brain, reduce infectious complications, and increase the effectiveness of rehabilitation measures and the rate of recovery of consciousness.Conclusion. The analysis revealed the ambiguity of the interpreted data on clinical recommendations and approaches to the use of nutritional support in patients with long-term impaired consciousness due to traumatic brain injury. Considering the fact that in most cases such patients need continuous long-term comprehensive rehabilitation measures, accompanied by significant energy costs of the body, an essential component of the rehabilitation process, in our opinion, is the inclusion of adequate nutritional support that prevents fast-progressing exhaustion and chronic catabolic processes. In this regard, such an urgent task is to optimize the algorithms of nutritional support in patients with long-term impaired consciousness after a traumatic brain injury, the solution of which will improve the functional state of the brain and, therefore, the rehabilitation prognosis and quality of their life.

scholarly journals Hemostasis Disturbances in Patients in the Acute Period of Isolated Traumatic Brain Injury (Review)

2018 ◽  
Vol 14 (5) ◽  
pp. 85-95 ◽  
Author(s):  
A. I. Baranich ◽  
A. A. Sychev ◽  
I. А. Savin ◽  
A. A. Polupan ◽  
A. V. Oshorov ◽  
...  
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Protein C ◽  
Coagulation System ◽  
Normal Functioning ◽  
Secondary Brain Damage ◽  
Pathophysiological Mechanisms ◽  
The Brain ◽  
Ischemic Events

Acute isolated traumatic brain injury (TBI) is frequently associated with occurrence of hemostasis disorders, which may be accompanied with hemorrhagic and ischemic events in the brain matter, hence, normal functioning of the blood coagulation system is critical. Understanding of the pathophysiological mechanisms of this phenomenon might help adequate prophylaxis of secondary brain damage. Earlier, development of disseminated intravascular coagulation syndrome (DIC) has been generally considered as a mechanism of coagulation disorders during TBI. However, over the recent decades, new data emerged concerning the key role of tissue factor, systemic inflammation response, thrombocytopathy, protein C effect in the occurrence of this coagulopathy. This overview of literature is aimed at providing the new data on specific pathophysiological mechanisms underlying coagulopathy following TBI.

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