Search results for "Juries"
showing 10 items of 639 documents
Astrocytic Calcium Waves Signal Brain Injury to Neural Stem and Progenitor Cells
2017
Summary Brain injuries, such as stroke or trauma, induce neural stem cells in the subventricular zone (SVZ) to a neurogenic response. Very little is known about the molecular cues that signal tissue damage, even over large distances, to the SVZ. Based on our analysis of gene expression patterns in the SVZ, 48 hr after an ischemic lesion caused by middle cerebral artery occlusion, we hypothesized that the presence of an injury might be transmitted by an astrocytic traveling calcium wave rather than by diffusible factors or hypoxia. Using a newly established in vitro system we show that calcium waves induced in an astrocytic monolayer spread to neural stem and progenitor cells and increase th…
Administration of all‐ trans retinoic acid after experimental traumatic brain injury is brain protective
2020
BACKGROUND AND PURPOSE: All‐trans retinoic acid (ATRA) is a vitamin A metabolite, important in the developing and mature brain. Pre‐injury ATRA administration ameliorates ischaemic brain insults in rodents. This study examined the effects of post‐traumatic ATRA treatment in experimental traumatic brain injury (TBI). EXPERIMENTAL APPROACH: Male adult mice were subjected to the controlled cortical impact model of TBI or sham procedure and killed at 7 or 30 days post‐injury (dpi). ATRA (10 mg kg−1, i.p.) was given immediately after the injury and 1, 2 and 3 dpi. Neurological function and sensorimotor coordination were evaluated. Brains were processed for (immuno‐) histological, mRNA and protei…
Plasminogen activator inhibitor‐1 augments damage by impairing fibrinolysis after traumatic brain injury
2019
Objective Plasminogen activator inhibitor-1 (PAI-1) is the key endogenous inhibitor of fibrinolysis, and enhances clot formation after injury. In traumatic brain injury, dysregulation of fibrinolysis may lead to sustained microthrombosis and accelerated lesion expansion. In the present study, we hypothesized that PAI-1 mediates post-traumatic malfunction of coagulation, with inhibition or genetic depletion of PAI-1 attenuating clot formation and lesion expansion after brain trauma. Methods We evaluated PAI-1 as a possible new target in a mouse controlled cortical impact (CCI) model of traumatic brain injury. We performed the pharmacological inhibition of PAI-1 with PAI-039 and stimulation b…
Fitness costs of increased cataract frequency and cumulative radiation dose in natural mammalian populations from Chernobyl
2015
AbstractA cataract is a clouding of the lens that reduces light transmission to the retina and it decreases the visual acuity of the bearer. The prevalence of cataracts in natural populations of mammals and their potential ecological significance, is poorly known. Cataracts have been reported to arise from high levels of oxidative stress and a major cause of oxidative stress is ionizing radiation. We investigated whether elevated frequencies of cataracts are found in eyes of bank voles Myodes glareolus collected from natural populations in areas with varying levels of background radiation in Chernobyl. We found high frequencies of cataracts in voles collected from different areas in Chernob…
Single intracerebroventricular progranulin injection adversely affects the blood–brain barrier in experimental traumatic brain injury
2021
Progranulin (PGRN) is a neurotrophic and anti-inflammatory factor with protective effects in animal models of ischemic stroke, subarachnoid hemorrhage, and traumatic brain injury (TBI). Administration of recombinant (r) PGRN prevents exaggerated brain pathology after TBI in Grn-deficient mice, suggesting that local injection of recombinant progranulin (rPGRN) provides therapeutic benefit in the acute phase of TBI. To test this hypothesis, we subjected adult male C57Bl/6N mice to the controlled cortical impact model of TBI, administered a single dose of rPGRN intracerebroventricularly (ICV) shortly before the injury, and examined behavioral and biological effects up to 5 days post injury (dp…
RS1 (Rsc1A1) deficiency limits cerebral SGLT1 expression and delays brain damage after experimental traumatic brain injury
2018
Acute cerebral lesions are associated with dysregulation of brain glucose homeostasis. Previous studies showed that knockdown of Na+ -D-glucose cotransporter SGLT1 impaired outcome after middle cerebral artery occlusion and that widely expressed intracellular RS1 (RSC1A1) is involved in transcriptional and post-translational down-regulation of SGLT1. In the present study, we investigated whether SGLT1 is up-regulated during traumatic brain injury (TBI) and whether removal of RS1 in mice (RS1-KO) influences SGLT1 expression and outcome. Unexpectedly, brain SGLT1 mRNA in RS1-KO was similar to wild-type whereas it was increased in small intestine and decreased in kidney. One day after TBI, SGL…
‘It’s not a part of me, but it is what it is’: the struggle of becoming en-wheeled after spinal cord injury
2019
Many people who experience spinal cord injury become long-term wheelchair users. This article addresses the process of becoming en-wheeled through the case example of a disabled man called Patrick.An intrinsic case study informed by posthumanist developments was used. Within this design, Patrick and his manual wheelchair were the entangled participants of the inquiry.Interviews and fieldwork observation with Patrick were conducted. Qualitative data were analysed using the posthumanist notion of 'assemblages'.The results illuminate Patrick's struggle of negotiating a new embodied selfhood that includes the wheelchair. Patrick engaged in ableist rehabilitation after spinal cord injury to recu…
Dry needling technique decreases spasticity and improves general functioning in incomplete spinal cord injury: A case report
2018
Context: Spasticity in neurological disorders (i.e. stroke patients and cerebral palsy) is positively improved by dry needling. However, reports are scarce regarding the potential effects of dry needling in reducing spasticity and improving functionality in patients with an incomplete spinal cord injury. The aim of this case report was to study the immediate, short-term effects of dry needling treatment (10 weeks) on spasticity, dynamic stability, walking velocity, self-independence, and pain in a single patient with an incomplete spinal cord injury. Findings: The dry needling treatment resulted in immediate, short-time effects on basal spasticity in the upper (reduction from 2 to 0 point m…
Deficiency of Plasminogen Activator Inhibitor Type 2 Limits Brain Edema Formation after Traumatic Brain Injury
2019
Plasminogen activator inhibitor-2 (PAI-2/SerpinB2) inhibits extracellular urokinase plasminogen activator (uPA). Under physiological conditions, PAI-2 is expressed at low levels but is rapidly induced by inflammatory triggers. It is a negative regulator of fibrinolysis and serves to stabilize clots. In the present study, PAI-2 expression is upregulated 25-fold in pericontusional brain tissue at 6 h after traumatic brain injury (TBI), with a maximum increase of 87-fold at 12 h. To investigate a potentially detrimental influence of PAI-2 on secondary post-traumatic processes, male PAI-2-deficient (PAI-2-KO) and wild-type mice (WT) were subjected to TBI by controlled cortical impact injury. Br…
Skull Fractures Induce Neuroinflammation and Worsen Outcomes after Closed Head Injury in Mice
2020
The weight-drop model is used widely to replicate closed-head injuries in mice; however, the histopathological and functional outcomes may vary significantly between laboratories. Because skull fractures are reported to occur in this model, we aimed to evaluate whether these breaks may influence the variability of the weight-drop (WD) model. Male Swiss Webster mice underwent WD injury with either a 2 or 5 mm cone tip, and behavior was assessed at 2 h and 24 h thereafter using the neurological severity score. The expression of interleukin (IL)-6, IL-1β, tumor necrosis factor-α, matrix metalloproteinase-9, and tissue inhibitor of metalloproteinase-1 genes was m…