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Stroke, brain, behavior

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https://www.readbyqxmd.com/read/28803158/balasubramide-derivative-3c-modulates-microglia-activation-via-camkk%C3%AE-dependent-ampk-pgc-1%C3%AE-pathway-in-neuroinflammatory-conditions
#1
Yunjie Wang, Wenchen Ruan, Junru Mi, Jingzi Xu, Haojie Wang, Zhengyu Cao, Juan M Saavedra, Luyong Zhang, Hansen Lin, Tao Pang
Neuroinflammation plays a vital role in the pathological process of cerebral ischemic stroke, but currently there is no effective treatment. After ischemia, microglia-produced proinflammatory mediator expression contributes to the aggravation of neuroinflammation, while anti-inflammatory activation of microglia develops an anti-neuroinflammatory effect via secretion of anti-inflammatory factor. Promoting the anti-inflammatory activation of microglia might be an effective treatment of stroke. Previously, we discovered one derivative of the natural product (+)-balasubramide, compound 3C, that exhibits a remarkably anti-neuroinflammatory effect in vitro with unknown mechanisms...
August 9, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28790974/selective-inhibition-of-janus-kinase-3-has-no-impact-on-infarct-size-or-neurobehavioral-outcomes-in-permanent-ischemic-stroke-in-mice
#2
Kelly M DeMars, Sean C Pacheco, Changjun Yang, David M Siwarski, Eduardo Candelario-Jalil
Janus kinase 3 (JAK3) is associated with the common gamma chain of several interleukin (IL) receptors essential to inflammatory signaling. To study the potential role of JAK3 in stroke-induced neuroinflammation, we subjected mice to permanent middle cerebral artery occlusion and investigated the effects of JAK3 inhibition with decernotinib (VX-509) on infarct size, behavior, and levels of several inflammatory mediators. Results from our double immunofluorescence staining showed JAK3 expression on neurons, endothelial cells, and microglia/macrophages in the ischemic mouse brain (n = 3)...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28782862/enhanced-estimations-of-post-stroke-aphasia-severity-using-stacked-multimodal-predictions
#3
Dorian Pustina, Harry Branch Coslett, Lyle Ungar, Olufunsho K Faseyitan, John D Medaglia, Brian Avants, Myrna F Schwartz
The severity of post-stroke aphasia and the potential for recovery are highly variable and difficult to predict. Evidence suggests that optimal estimation of aphasia severity requires the integration of multiple neuroimaging modalities and the adoption of new methods that can detect multivariate brain-behavior relationships. We created and tested a multimodal framework that relies on three information sources (lesion maps, structural connectivity, and functional connectivity) to create an array of unimodal predictions which are then fed into a final model that creates "stacked multimodal predictions" (STAMP)...
August 7, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28776186/home-sweet-home-the-neural-stem-cell-niche-throughout-development-and-after-injury
#4
REVIEW
Rebecca M Ruddy, Cindi M Morshead
Neural stem cells and their progeny reside in two distinct neurogenic niches within the mammalian brain: the subventricular zone and the dentate gyrus. The interplay between the neural stem cells and the niche in which they reside can have significant effects on cell kinetics and neurogenesis. A comprehensive understanding of the changes to the niche that occur through postnatal development and aging, as well as following injury, is relevant for developing therapeutics and interventions to promote neural repair...
August 3, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28771575/zl006-a-small-molecule-inhibitor-of-psd-95-nnos-interaction-does-not-induce-antidepressant-like-effects-in-two-genetically-predisposed-rat-models-of-depression-and-control-animals
#5
Sandra Tillmann, Vitor Silva Pereira, Nico Liebenberg, Anne Karina Christensen, Gregers Wegener
N-methyl-D-aspartate receptor (NMDA-R) antagonists and nitric oxide inhibitors have shown promising efficacy in depression but commonly induce adverse events. To circumvent these, a more indirect disruption of the nitric oxide synthase/postsynaptic density protein 95 kDa complex at the NMDA-R has been proposed. This disruption can be achieved using small molecule inhibitors such as ZL006, which has attracted attention as ischemic stroke therapy in rodents and has been proposed as a potential novel treatment for depression...
2017: PloS One
https://www.readbyqxmd.com/read/28769870/altered-coupling-between-motion-related-activation-and-resting-state-brain-activity-in-the-ipsilesional-sensorimotor-cortex-after-cerebral-stroke
#6
Jianping Hu, Juan Du, Qiang Xu, Fang Yang, Fanyong Zeng, Xi-Jian Dai, Xiaoxue Liu, Guangming Lu, Zhiqiang Zhang
Functional connectivity maps using resting-state functional magnetic resonance imaging (rs-fMRI) can closely resemble task fMRI activation patterns, suggesting that resting-state brain activity may predict task-evoked activation or behavioral performance. However, this conclusion was mostly drawn upon a healthy population. It remains unclear whether the predictive ability of resting-state brain activity for task-evoked activation would change under different pathological conditions. This study investigated dynamic changes of coupling between patterns of resting-state functional connectivity (RSFC) and motion-related activation in different stages of cerebral stroke...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28768369/recent-developments-in-understanding-the-role-of-the-gut-microbiota-in-brain-health-and-disease
#7
REVIEW
Eoin Sherwin, Timothy G Dinan, John F Cryan
There is a growing appreciation of the role of the gut microbiota in all aspects of health and disease, including brain health. Indeed, roles for the bacterial commensals in various psychiatric and neurological conditions, such as depression, autism, stroke, Parkinson's disease, and Alzheimer's disease, are emerging. Microbiota dysregulation has been documented in all of these conditions or in animal models thereof. Moreover, depletion or modulation of the gut microbiota can affect the severity of the central pathology or behavioral deficits observed in a variety of brain disorders...
August 2, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28756213/noradrenergic-antagonists-mitigate-amphetamine-induced-recovery
#8
M J Hylin, M M Brenneman, J V Corwin
Brain injury, including that due to stroke, leaves individuals with cognitive deficits that can disrupt daily aspect of living. As of now there are few treatments that shown limited amounts of success in improving functional outcome. The use of stimulants such as amphetamine have shown some success in improving outcome following brain injury. While the pharmacological mechanisms for amphetamine are known; the specific processes responsible for improving behavioral outcome following injury remain unknown. Understanding these mechanisms can help to refine the use of amphetamine as a potential treatment or lead to the use of other methods that share the same pharmacological properties...
July 27, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28754163/choroid-plexus-cerebrospinal-fluid-route-for-monocyte-derived-macrophages-after-stroke
#9
Ruimin Ge, Daniel Tornero, Masao Hirota, Emanuela Monni, Cecilia Laterza, Olle Lindvall, Zaal Kokaia
BACKGROUND: Choroid plexus (CP) supports the entry of monocyte-derived macrophages (MDMs) to the central nervous system in animal models of traumatic brain injury, spinal cord injury, and Alzheimer's disease. Whether the CP is involved in the recruitment of MDMs to the injured brain after ischemic stroke is unknown. METHODS: Adult male C57BL/6 mice were subjected to focal cortical ischemia by permanent occlusion of the distal branch of the right middle cerebral artery...
July 28, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28751018/deletion-of-the-p2x4-receptor-is-neuroprotective-acutely-but-induces-a-depressive-phenotype-during-recovery-from-ischemic-stroke
#10
Rajkumar Verma, Chunxia G Cronin, Jacob Hudobenko, Venugopal R Venna, Louise D McCullough, Bruce T Liang
INTRODUCTION: Acute ischemic injury leads to severe neuronal loss. One of the key mechanisms responsible for this effect is inflammation, which is characterized by the activation of myeloid cells, including resident microglia and infiltrating monocytes/macrophages. P2X4 receptors (P2X4Rs) present on these immune cells modulate the inflammatory response. For example, excessive release of adenosine triphosphate during acute ischemic stroke triggers stimulation of P2X4Rs, leading to myeloid cell activation and proliferation and further exacerbating post-ischemic inflammation...
July 24, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28719572/neuroimaging-correlates-of-post-stroke-aphasia-rehabilitation-in-a-pilot-randomized-trial-of-constraint-induced-aphasia-therapy
#11
Rodolphe Nenert, Jane B Allendorfer, Amber M Martin, Christi Banks, Angel Ball, Jennifer Vannest, Aimee R Dietz, Jerzy P Szaflarski
BACKGROUND Recovery from post-stroke aphasia is a long and complex process with an uncertain outcome. Various interventions have been proposed to augment the recovery, including constraint-induced aphasia therapy (CIAT). CIAT has been applied to patients suffering from post-stroke aphasia in several unblinded studies to show mild-to-moderate linguistic gains. The aim of the present study was to evaluate the neuroimaging correlates of CIAT in patients with chronic aphasia related to left middle cerebral artery stroke...
July 18, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28699721/comparison-of-pre-and-post-ischemic-treatment-of-telmisartan-and-nimodipine-combination-in-experimentally-induced-cerebral-ischemia
#12
(no author information available yet)
Time dependent intervention plays a crucial role in preventing neurodegeneration after ischemic insult. The intensity of excitotoxicity is greater in the secondary reperfusion phase (2-4 h) compared to the primary occlusion phase (2 h), which could be attributed to secondary elevation of excitatory amino acids (EAA) in cerebral ischemia. In the present study, we tried to assess the neuroprotective effects of telmisartan and nimodipine (TM-NM) combination on the secondary reperfusion phase. The drug treatments were made immediately after reperfusion and their effects were compared with pre-treatment...
September 2016: Indian Journal of Experimental Biology
https://www.readbyqxmd.com/read/28699511/striatal-enriched-tyrosine-protein-phosphatase-step-in-the-mechanisms-of-depressive-disorders
#13
Elizabeth Kulikova, Alexander Kulikov
Striatal-enriched tyrosine protein phosphatase (STEP) is expressed mainly in the brain. Its dysregulation is associated with Alzheimer's and Huntington's diseases, schizophrenia, fragile X syndrome, drug abuse and stroke/ischemia. However, an association between STEP and depressive disorders is still obscure. The review discusses the theoretical foundations and experimental facts concerning possible relationship between STEP dysregulation and depression risk. STEP dephosphorylates and inactivates several key neuronal signaling proteins such as extracellular signal-regulating kinase 1 and 2 (ERK1/2), stress activated protein kinases p38, the Src family tyrosine kinases Fyn, Pyk2, NMDA and AMPA glutamate receptors...
July 10, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28689673/the-anatomy-of-apathy-a-neurocognitive-framework-for-amotivated-behaviour
#14
C Le Heron, M A J Apps, M Husain
Apathy is a debilitating syndrome associated with many neurological disorders, including several common neurodegenerative diseases such as Parkinson's disease and Alzheimer's disease, and focal lesion syndromes such as stroke. Here, we review neuroimaging studies to identify anatomical correlates of apathy, across brain disorders. Our analysis reveals that apathy is strongly associated with disruption particularly of dorsal anterior cingulate cortex (dACC), ventral striatum (VS) and connected brain regions...
July 8, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28685450/effects-of-motor-imagery-on-cognitive-function-and-prefrontal-cortex-activity-in-normal-adults-evaluated-by-nirs
#15
M Moriya, K Sakatani
Recent near-infrared spectroscopy (NIRS) studies demonstrated that physical exercise enhances working memory (WM) performance and prefrontal cortex (PFC) activity during WM tasks in normal adults. Interestingly, the effects of rehabilitation (i.e. physiotherapy) on post-stroke patients could be enhanced by motor imagery (MI), an active process during which the specified action is reproduced within WM without any actual physical movement. However, it is not known whether MI can enhance cognitive function and associated brain activity...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28680300/repeated-oral-administration-of-human-serum-albumin-protects-from-the-cerebral-ischemia-in-rat-brain-following-mcao
#16
Hyejin Park, Minyoung Hong, Gil-Ja Jhon, Youngmi Lee, Minah Suh
Albumin is known to have neuroprotective effects. The protein has a long half-life circulation, and its effects can therefore persist for a long time to aid in the recovery of brain ischemia. In the present study, we investigated the neuroprotective effects of human serum albumin (HSA) on brain hemodynamics. Albumin is administrated using repeated oral gavage to the rodents. Sprague-Dawley rats underwent middle cerebral artery occlusion procedures and served as a stroke model. Afterwards, 25% human serum albumin (1...
June 2017: Experimental Neurobiology
https://www.readbyqxmd.com/read/28676576/stimulating-multiple-demand-cortex-enhances-vocabulary-learning
#17
Magdalena W Sliwinska, Inês R Violante, Richard J S Wise, Robert Leech, Joseph T Devlin, Fatemeh Geranmayeh, Adam Hampshire
It is well established that networks within multiple-demand cortex (MDC) become active when diverse skills and behaviors are being learnt. However, their causal role in learning remains to be established. In the present study, we first performed functional magnetic resonance imaging on healthy female and male human participants to confirm that MDC was most active in the initial stages of learning a novel vocabulary, consisting of pronounceable nonwords (pseudowords), each associated with a picture of a real object...
August 9, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28674515/investigating-the-blood-oxygenation-level-dependent-functional-mri-response-to-a-verbal-fluency-task-in-early-stroke-before-and-after-hemodynamic-scaling
#18
Veena A Nair, Ryan V Raut, Vivek Prabhakaran
BACKGROUND AND OBJECTIVE: Blood oxygenation level-dependent (BOLD) functional MRI (fMRI) has been extensively used as a marker of brain dysfunction and subsequent recovery following stroke. However, growing evidence suggests that straightforward interpretation of BOLD fMRI changes with aging and disease is challenging. In this study, we investigated the effect of calibrating task fMRI data by applying a hemodynamic calibration method using the resting-state fluctuation amplitude (RSFA)...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28645895/multiparity-improves-outcomes-after-cerebral-ischemia-in-female-mice-despite-features-of-increased-metabovascular-risk
#19
Rodney M Ritzel, Anita R Patel, Monica Spychala, Rajkumar Verma, Joshua Crapser, Edward C Koellhoffer, Anna Schrecengost, Evan R Jellison, Liang Zhu, Venugopal Reddy Venna, Louise D McCullough
Females show a varying degree of ischemic sensitivity throughout their lifespan, which is not fully explained by hormonal or genetic factors. Epidemiological data suggest that sex-specific life experiences such as pregnancy increase stroke risk. This work evaluated the role of parity on stroke outcome. Age-matched virgin (i.e., nulliparous) and multiparous mice were subjected to 60 min of reversible middle cerebral artery occlusion and evaluated for infarct volume, behavioral recovery, and inflammation. Using an established mating paradigm, fetal microchimeric cells present in maternal mice were also tracked after parturition and stroke...
July 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28632329/postictal-hypoperfusion-hypoxia-provides-the-foundation-for-a-unified-theory-of-seizure-induced-brain-abnormalities-and-behavioral-dysfunction
#20
REVIEW
Jordan S Farrell, Roberto Colangeli, Marshal D Wolff, Alexandra K Wall, Thomas J Phillips, Antis George, Paolo Federico, G Campbell Teskey
A recent article by Farrell et al. characterizes the phenomenon, mechanisms, and treatment of a local and severe hypoperfusion/hypoxia event that occurs in brain regions following a focal seizure. Given the well-established role of cerebral ischemia/hypoxia in brain damage and behavioral dysfunction in other clinical settings (e.g., stroke, cerebral vasospasm), we put forward a new theory: postictal hypoperfusion/hypoxia is responsible for the negative consequences associated with seizures. Fortunately, inhibition of two separate molecular targets, cyclooxygenase-2 (COX-2) and l-type calcium channels, can prevent the expression of postictal hypoperfusion/hypoxia...
June 20, 2017: Epilepsia
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