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https://www.readbyqxmd.com/read/29677125/detrimental-effects-of-helium-ion-irradiation-on-cognitive-performance-and-cortical-levels-of-map-2-in-b6d2f1-mice
#1
Jacob Raber, Eileen Ruth S Torres, Tunde Akinyeke, Joanne Lee, Sydney J Weber Boutros, Mitchell S Turker, Amy Kronenberg
The space radiation environment includes helium (⁴He) ions that may impact brain function. As little is known about the effects of exposures to ⁴He ions on the brain, we assessed the behavioral and cognitive performance of C57BL/6J × DBA2/J F1 (B6D2F1) mice three months following irradiation with ⁴He ions (250 MeV/n; linear energy transfer (LET) = 1.6 keV/μm; 0, 21, 42 or 168 cGy). Sham-irradiated mice and mice irradiated with 21 or 168 cGy showed novel object recognition, but mice irradiated with 42 cGy did not...
April 20, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29677121/prophylactic-neuroprotection-of-total-glucosides-of-paeoniae-radix-alba-against-semen-strychni-induced-neurotoxicity-in-rats-suppressing-oxidative-stress-and-reducing-the-absorption-of-toxic-components
#2
Shujuan Li, Yanjie Chu, Ruowen Zhang, Linjia Sun, Xiaohui Chen
Strychnos alkaloids (SAs) are the main toxic constituents in Semen Strychni, a traditional Chinese medicine, which is known for its fatal neurotoxicity. Hence, the present study was carried out to evaluate the neurotoxicity induced by SAs and the pre-protective effects of the total glucosides of Paeoniae Radix Alba (TGP). An SA brain damage model was firstly established. The neurotoxicity induced by SAs and the pre-protective effects of TGP were confirmed by physical and behavioral testing, biochemical assay, and histological examination...
April 20, 2018: Nutrients
https://www.readbyqxmd.com/read/29676484/structural-and-metabolic-brain-correlates-of-apathy-in-huntington-s-disease
#3
Saul Martínez-Horta, Jesús Perez-Perez, Frederic Sampedro, Javier Pagonabarraga, Andrea Horta-Barba, Mar Carceller-Sindreu, Beatriz Gomez-Anson, Gloria Andrea Lozano-Martinez, Diego Alfonso Lopez-Mora, Valle Camacho, Alejandro Fernández-León, Ignasi Carrió, Jaime Kulisevsky
BACKGROUND: Apathy is the most prevalent and characteristic neuropsychiatric feature of Huntington's disease. Congruent with the main early pathological changes, apathy is primarily associated with subcortical damage in frontal-striatal circuits. However, little is known about its precise subserving mechanisms and the contribution of regions other than the basal ganglia. OBJECTIVES: We aimed to define the neural correlates of apathy in Huntington's disease based on gray matter volume and PET/CT of 18 F-fluorodeoxyglucose metabolism...
April 20, 2018: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/29676103/-protective-effect-and-mechanism-of-p-hydroxybenzaldehyde-on-blood-brain-barrier
#4
Yan-Ping Zhu, Xin Li, Yao Du, Lu Zhang, Li Ran, Ning-Na Zhou
The disruption of blood-brain barrier(BBB) induced by oxidative stress is an important pathological reaction which results in secondary brain injury during the cerebral ischemia-reperfusion. This study was designed to investigate the protective effect and mechanism of p-hydroxybenzaldehyde (p-HBA) from Gastrodia elata on BBB. The BBB is mainly consisted of vascular endothelial cells and astrocytes, so brain microvascular endothelial cell line (bEnd.3) and astrocytes (Ast) in mice were used in this study to establish BBB model...
March 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29675862/hemodialysis-a-model-for-extreme-physiology-in-a-vulnerable-patient-population
#5
REVIEW
Jeroen P Kooman, Krassimir Katzarski, Frank M van der Sande, Karel M Leunissen, Peter Kotanko
Hemodialysis (HD) is a lifesaving treatment for patients with end-stage renal disease, which is very efficient in the correction of abnormalities of the internal environment. However, this efficiency also induces significant hemodynamic, thermal, and respiratory stressors. These have parallels with the extreme physiologic demands which are normally mainly experienced by healthy subjects under adverse environmental conditions, with the difference that they must be endured by a vulnerable patient population. Hemodynamic stress induced by ultrafiltration leads to a decline in circulating blood volume, which may result in intradialytic hypotension (IDH) and changes in tissue perfusion, which may have long-term consequences for the function of vital organs such as the brain and the heart...
April 19, 2018: Seminars in Dialysis
https://www.readbyqxmd.com/read/29675297/minimally-invasive-multimode-optical-fiber-microendoscope-for-deep-brain-fluorescence-imaging
#6
Shay Ohayon, Antonio Caravaca-Aguirre, Rafael Piestun, James J DiCarlo
A major open challenge in neuroscience is the ability to measure and perturb neural activity in vivo from well defined neural sub-populations at cellular resolution anywhere in the brain. However, limitations posed by scattering and absorption prohibit non-invasive multi-photon approaches for deep (>2mm) structures, while gradient refractive index (GRIN) endoscopes are relatively thick and can cause significant damage upon insertion. Here, we present a novel micro-endoscope design to image neural activity at arbitrary depths via an ultra-thin multi-mode optical fiber (MMF) probe that has 5-10X thinner diameter than commercially available micro-endoscopes...
April 1, 2018: Biomedical Optics Express
https://www.readbyqxmd.com/read/29674752/protecting-the-ischaemic-penumbra-as-an-adjunct-to-thrombectomy-for-acute-stroke
#7
REVIEW
Jean-Claude Baron
After ischaemic stroke, brain damage can be curtailed by rescuing the 'ischaemic penumbra' - that is, the severely hypoperfused, at-risk but not yet infarcted tissue. Current evidence-based treatments involve restoration of blood flow so as to salvage the penumbra before it evolves into irreversibly damaged tissue, termed the 'core'. Intravenous thrombolysis (IVT) can salvage the penumbra if given within 4.5 h after stroke onset; however, the early recanalization rate is only ~30%. Direct removal of the occluding clot by mechanical thrombectomy considerably improves outcomes over IVT alone, but despite early recanalization in > 80% of cases, ~50% of patients who receive this treatment do not enjoy functional independence, usually because the core is already too large at the time of recanalization...
April 19, 2018: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/29674624/brain-and-spinal-cord-injury-repair-by-implantation-of-human-neural-progenitor-cells-seeded-onto-polymer-scaffolds
#8
Jeong Eun Shin, Kwangsoo Jung, Miri Kim, Kyujin Hwang, Haejin Lee, Il-Sun Kim, Bae Hwan Lee, Il-Shin Lee, Kook In Park
Hypoxic-ischemic (HI) brain injury and spinal cord injury (SCI) lead to extensive tissue loss and axonal degeneration. The combined application of the polymer scaffold and neural progenitor cells (NPCs) has been reported to enhance neural repair, protection and regeneration through multiple modes of action following neural injury. This study investigated the reparative ability and therapeutic potentials of biological bridges composed of human fetal brain-derived NPCs seeded upon poly(glycolic acid)-based scaffold implanted into the infarction cavity of a neonatal HI brain injury or the hemisection cavity in an adult SCI...
April 20, 2018: Experimental & Molecular Medicine
https://www.readbyqxmd.com/read/29674241/protective-effect-of-betulinic-acid-against-intracerebroventricular-streptozotocin-induced-cognitive-impairment-and-neuronal-damage-in-rats-possible-neurotransmitters-and-neuroinflammatory-mechanism
#9
Madhu Kaundal, Rahul Deshmukh, Mohd Akhtar
BACKGROUND: The purpose of the study was to explore the therapeutic potential of Betulinic acid (BA) in streptozotocin (STZ) induced memory damage in experimental rats. METHODS: STZ (3 mg/kg bilaterally) as intracerebroventrical (icv) route was administered on day 1 and 3 in rats. Donepezil (5 mg/kg/day po), used as standard, and BA (5, 10 and 15 mg/kg/day po) were administered after 1 h of 1st STZ infusion up to 21 days. Object recognition task (ORT) for non-spatial, Morris water maze (MWM) for spatial and locomotor activity were performed to evaluate behavioral changes in rats...
December 6, 2017: Pharmacological Reports: PR
https://www.readbyqxmd.com/read/29673549/tau-and-neuroinflammation-what-impact-for-alzheimer-s-disease-and-tauopathies
#10
REVIEW
Cyril Laurent, Luc Buée, David Blum
Alzheimer's Disease (AD) is a chronic neurodegenerative disorder and the most common type of dementia (60-80% of cases). In 2016, nearly 44 million people were affected by AD or related dementia. AD is characterized by progressive neuronal damages leading to subtle and latter obvious decline in cognitive functions including symptoms such as memory loss or confusion, which ultimately require full-time medical care. Its neuropathology is defined by the extracellular accumulation of amyloid-β (Aβ) peptide into amyloid plaques, and intraneuronal neurofibrillary tangles (NFT) consisting of aggregated hyper- and abnormal phosphorylation of tau protein...
February 2018: Biomedical Journal
https://www.readbyqxmd.com/read/29673373/chorioamnionitis-neuroinflammation-and-injury-timing-is-key-in-the-preterm-ovine-fetus
#11
Ruth Gussenhoven, Rob J J Westerlaken, Daan R M G Ophelders, Alan H Jobe, Matthew W Kemp, Suhas G Kallapur, Luc J Zimmermann, Per T Sangild, Stanislava Pankratova, Pierre Gressens, Boris W Kramer, Bobbi Fleiss, Tim G A M Wolfs
BACKGROUND: Antenatal infection (i.e., chorioamnionitis) is an important risk factor for adverse neurodevelopmental outcomes after preterm birth. Destructive and developmental disturbances of the white matter are hallmarks of preterm brain injury. Understanding the temporal effects of antenatal infection in relation to the onset of neurological injury is crucial for the development of neurotherapeutics for preterm infants. However, these dynamics remain unstudied. METHODS: Time-mated ewes were intra-amniotically injected with lipopolysaccharide at 5, 12, or 24 h or 2, 4, 8, or 15 days before preterm delivery at 125 days gestational age (term ~ 150 days)...
April 19, 2018: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/29673289/systematic-review-of-the-pharmacological-agents-that-have-been-tested-against-spreading-depolarizations
#12
Anna Klass, Renan Sánchez-Porras, Edgar Santos
Spreading depolarization (SD) occurs alongside brain injuries and it can lead to neuronal damage. Therefore, pharmacological modulation of SD can constitute a therapeutic approach to reduce its detrimental effects and to improve the clinical outcome of patients. The major objective of this article was to produce a systematic review of all the drugs that have been tested against SD. Of the substances that have been examined, most have been shown to modulate certain SD characteristics. Only a few have succeeded in significantly inhibiting SD...
January 1, 2018: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29673084/impairment-in-judgement-of-the-moral-emotion-guilt-following-orbitofrontal-cortex-damage
#13
Michitaka Funayama, Akihiro Koreki, Taro Muramatsu, Masaru Mimura, Motoichiro Kato, Takayuki Abe
Although neuroimaging studies have provided evidence for an association between moral emotions and the orbitofrontal cortex, studies on patients with focal lesions using experimental probes of moral emotions are scarce. Here, we addressed this topic by presenting a moral emotion judgement task to patients with focal brain damage. Four judgement tasks in a simple pairwise choice paradigm were given to 72 patients with cerebrovascular disease. These tasks consisted of a perceptual line judgement task as a control task; the objects' preference task as a basic preference judgement task; and two types of moral emotion judgement task, an anger task and a guilt task...
April 19, 2018: Journal of Neuropsychology
https://www.readbyqxmd.com/read/29672906/do-brain-structural-abnormalities-differentiate-separate-forms-of-urgency-urinary-incontinence
#14
Becky D Clarkson, Derek Griffiths, Neil M Resnick
AIMS: Urgency urinary incontinence (UUI) is a major problem for seniors. The underlying mechanisms of disease and therapy are unknown. We sought structural brain abnormalities that might underlie the functional differences previously observed by functional Magnetic Resonance Imaging in UUI patients versus controls, or among UUI responders versus non-responders to therapy-and thereby reveal potential disease mechanisms and therapeutic targets. METHODS: Secondary study of a trial of biofeedback-assisted pelvic floor muscle training (BFB) in 60 women (>60 yrs) with UUI, plus 11 age-matched continent controls...
April 19, 2018: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/29672236/the-brain-health-index-towards-a-combined-measure-of-neurovascular-and-neurodegenerative-structural-brain-injury
#15
David Alexander Dickie, Maria Del C Valdés Hernández, Stephen D Makin, Julie Staals, Stewart J Wiseman, Mark E Bastin, Joanna M Wardlaw
Background A structural magnetic resonance imaging measure of combined neurovascular and neurodegenerative burden may be useful as these features often coexist in older people, stroke and dementia. Aim We aimed to develop a new automated approach for quantifying visible brain injury from small vessel disease and brain atrophy in a single measure, the brain health index. Materials and methods We computed brain health index in N = 288 participants using voxel-based Gaussian mixture model cluster analysis of T1, T2, T2*, and FLAIR magnetic resonance imaging...
January 1, 2018: International Journal of Stroke: Official Journal of the International Stroke Society
https://www.readbyqxmd.com/read/29671296/minimally-invasive-tubular-retractor-assisted-biopsy-and-resection-of-subcortical-intra-axial-gliomas-and-other-neoplasms
#16
Kelly Gassie, Olindi Wijesekera, Kaisorn L Chaichana
Deep-seated, subcortical tumors represent a surgical challenge. The traditional approach to these lesions involve large craniotomies, fixed retractor systems, and extensive white matter dissection, each with their own associated morbidity. We describe our experience with the use of tubular retractors for accessing these deep-seated lesions. Fifty consecutive patients operated on for an intra-axial brain tumor (both biopsies and resection) from January 2016 to December 2017 by a single surgeon using tubular retractors with exoscopic visualization were prospectively identified and included in this consecutive case series...
April 18, 2018: Journal of Neurosurgical Sciences
https://www.readbyqxmd.com/read/29671295/monitoring-the-injured-brain
#17
Anna T Mazzeo, Deepak K Gupta
Traumatic brain injury can be defined as the most complex disease in the most complex organ. When an acute brain injury occurs, several pathophysiological cascades are triggered, leading to further exacerbation of the primary damage. A number of events potentially occurring after TBI can compromise the availability or utilization of energy substrates in the brain, ultimately leading to brain energy crisis. The frequent occurrence of secondary insults in the acute phase after TBI, such as intracranial hypertension, hypotension, hypoxia, hypercapnia, hyperthermia, seizures, can then increase cerebral damage, and adversely affect outcome...
April 18, 2018: Journal of Neurosurgical Sciences
https://www.readbyqxmd.com/read/29671042/hyperbaric-oxygen-therapy-reduces-astrogliosis-and-helps-to-recovery-brain-damage-in-hydrocephalic-young-rats
#18
Stephanya Covas da Silva, Omar Feres, Pâmella da Silva Beggiora, Hélio Rubens Machado, Rafael Menezes-Reis, João Eduardo Araújo, Ricardo Andrade Brandão, Luiza da Silva Lopes
PURPOSE: We investigated the possible beneficial effects that hyperbaric oxygen therapy could offer in different brain structures affected by ventriculomegaly in pup rats submitted to experimental hydrocephalus. METHODS: Seven-day-old Wistar rats were submitted to hydrocephalus by intracisternal injection of 10% kaolin into the cisterna magna. The animals were divided into four groups: control (n = 5); control with HBOT (3ATA/2 h/day) (n = 5); untreated hydrocephalic (n = 10); hydrocephalic treated with HBOT (3ATA/2 h/day) (n = 10)...
April 18, 2018: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29670625/immunology-of-cryptococcal-infections-developing-a-rational-approach-to-patient-therapy
#19
REVIEW
Waleed Elsegeiny, Kieren A Marr, Peter R Williamson
Cryptococcal meningoencephalitis is responsible for upwards of 15% of HIV-related deaths worldwide and is currently the most common cause of non-viral meningitis in the US, affecting both previously healthy and people with immune suppression caused by cancer chemotherapy, transplantation, and biologic therapies. Despite a continued 30-50% attributable mortality, recommended therapeutic strategies have remained largely unchanged since the 1950s. Recent murine models and human studies examining the role of the immune system in both susceptibility to the infection as well as host damage have begun to influence patient care decisions...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29670465/emerging-roles-of-immune-cells-in-postoperative-cognitive-dysfunction
#20
REVIEW
Yue Liu, Yiqing Yin
Postoperative cognitive dysfunction (POCD), a long-lasting cognitive decline after surgery, is currently a major clinical problem with no clear pathophysiological mechanism or effective therapy. Accumulating evidence suggests that neuroinflammation plays a critical role in POCD. After surgery, alarmins are leaked from the injury sites and proinflammatory cytokines are increased in the peripheral circulation. Neurons in the hippocampus, which is responsible for learning and memory, can be damaged by cytokines transmitted to the brain parenchyma...
2018: Mediators of Inflammation
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