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Journal of Cerebral Blood Flow and Metabolism

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https://www.readbyqxmd.com/read/27909266/reliability-of-infarct-volumetry-its-relevance-and-the-improvement-by-a-software-assisted-approach
#1
Felix Friedländer, Ferdinand Bohmann, Max Brunkhorst, Ju-Hee Chae, Kavi Devraj, Yvette Köhler, Peter Kraft, Hannah Kuhn, Alexandra Lucaciu, Sebastian Luger, Waltraud Pfeilschifter, Rebecca Sadler, Arthur Liesz, Karolina Scholtyschik, Leonie Stolz, Rajkumar Vutukuri, Robert Brunkhorst
Despite the efficacy of neuroprotective approaches in animal models of stroke, their translation has so far failed from bench to bedside. One reason is presumed to be a low quality of preclinical study design, leading to bias and a low a priori power. In this study, we propose that the key read-out of experimental stroke studies, the volume of the ischemic damage as commonly measured by free-handed planimetry of TTC-stained brain sections, is subject to an unrecognized low inter-rater and test-retest reliability with strong implications for statistical power and bias...
December 1, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27909265/prevention-of-the-collapse-of-pial-collaterals-by-remote-ischemic-perconditioning-during-acute-ischemic-stroke
#2
Junqiang Ma, Yonglie Ma, Bin Dong, Mischa V Bandet, Ashfaq Shuaib, Ian R Winship
Collateral circulation is a key variable determining prognosis and response to recanalization therapy during acute ischemic stroke. Remote ischemic perconditioning (RIPerC) involves inducing peripheral ischemia (typically in the limbs) during stroke and may reduce perfusion deficits and brain damage due to cerebral ischemia. In this study, we directly investigated pial collateral flow augmentation due to RIPerC during distal middle cerebral artery occlusion (MCAo) in rats. Blood flow through pial collaterals between the anterior cerebral artery (ACA) and the MCA was assessed in male Sprague Dawley rats using in vivo laser speckle contrast imaging (LSCI) and two photon laser scanning microscopy (TPLSM) during distal MCAo...
December 1, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27909264/global-ablation-of-the-mitochondrial-calcium-uniporter-increases-glycolysis-in-cortical-neurons-subjected-to-energetic-stressors
#3
Matthew Nichols, Pia A Elustondo, Jordan Warford, Aruloli Thirumaran, Evgeny V Pavlov, George S Robertson
The effects of global mitochondrial calcium (Ca(2+)) uniporter (MCU) deficiency on hypoxic-ischemic (HI) brain injury, neuronal Ca(2+) handling, bioenergetics and hypoxic preconditioning (HPC) were examined. Forebrain mitochondria isolated from global MCU nulls displayed markedly reduced Ca(2+) uptake and Ca(2+)-induced opening of the membrane permeability transition pore. Despite evidence that these effects should be neuroprotective, global MCU nulls and wild-type (WT) mice suffered comparable HI brain damage...
December 1, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27903921/a-two-pool-model-to-describe-the-ivim-cerebral-perfusion
#4
Gabrielle Fournet, Jing-Rebecca Li, Alex M Cerjanic, Bradley P Sutton, Luisa Ciobanu, Denis Le Bihan
IntraVoxel Incoherent Motion (IVIM) is a magnetic resonance imaging (MRI) technique capable of measuring perfusion-related parameters. In this manuscript, we show that the mono-exponential model commonly used to process IVIM data might be challenged, especially at short diffusion times. Eleven rat datasets were acquired at 7T using a diffusion-weighted pulsed gradient spin echo sequence with b-values ranging from 7 to 2500 s/mm(2) at three diffusion times. The IVIM signals, obtained by removing the diffusion component from the raw MR signal, were fitted to the standard mono-exponential model, a bi-exponential model and the Kennan model...
November 30, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27899766/examining-potential-side-effects-of-therapeutic-hypothermia-in-experimental-intracerebral-hemorrhage
#5
Shannon Wowk, Kelly J Fagan, Yonglie Ma, Helen Nichol, Frederick Colbourne
Studies treating intracerebral hemorrhage (ICH) with therapeutic hypothermia (TH) have shown inconsistent benefits. We hypothesized that TH's anti-inflammatory effects may be responsible as inflammatory cells are essential for removing degrading erythrocytes. Here, we subjected rats to a collagenase-induced striatal ICH followed by whole-body TH (∼33℃ for 11-72 h) or normothermia. We used X-ray fluorescence imaging to spatially quantify total and peri-hematoma iron three days post-injury. At three and seven days, we measured non-heme iron levels...
November 29, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27885100/temporal-analysis-of-blood-brain-barrier-disruption-and-cerebrospinal-fluid-matrix-metalloproteinases-in-rhesus-monkeys-subjected-to-transient-ischemic-stroke
#6
Yingqian Zhang, Feng Fan, Guojun Zeng, Linlin Zhou, Yinbing Zhang, Jie Zhang, He Jiao, Ting Zhang, Dan Su, Cheng Yang, Xin Wang, Kai Xiao, Hongxia Li, Zhihui Zhong
Blood-brain barrier (BBB) disruption plays an important role in pathophysiological progress of ischemic stroke. However, our knowledge of the dynamic change of BBB permeability and its mechanism remains limited. In the current study, we used a non-human primate (NHP) MCAO model and a serial CSF sampling method that allowed us to determine the dynamic change of BBB permeability by calculating the CSF/serum albumin ratio (AR). We showed that AR increased rapidly and significantly after ischemia, and the fold increase of AR is highly correlated with the infarction size during the subacute phase...
November 24, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27879386/mitochondrial-calcium-homeostasis-implications-for-neurovascular-and-neurometabolic-coupling
#7
REVIEW
Sridhar S Kannurpatti
Mitochondrial function is critical to maintain high rates of oxidative metabolism supporting energy demands of both spontaneous and evoked neuronal activity in the brain. Mitochondria not only regulate energy metabolism, but also influence neuronal signaling. Regulation of "energy metabolism" and "neuronal signaling" (i.e. neurometabolic coupling), which are coupled rather than independent can be understood through mitochondria's integrative functions of calcium ion (Ca(2+)) uptake and cycling. While mitochondrial Ca(2+) do not affect hemodynamics directly, neuronal activity changes are mechanistically linked to functional hyperemic responses (i...
November 22, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27864466/thiamet-g-mediates-neuroprotection-in-experimental-stroke-by-modulating-microglia-macrophage-polarization-and-inhibiting-nf-%C3%AE%C2%BAb-p65-signaling
#8
Yating He, Xiaofeng Ma, Daojing Li, Junwei Hao
Inflammatory responses are accountable for secondary injury induced by acute ischemic stroke (AIS). Previous studies indicated that O-GlcNAc modification (O-GlcNAcylation) is involved in the pathology of AIS, and increase of O-GlcNAcylation by glucosamine attenuated the brain damage after ischemia/reperfusion. Inhibition of β-N-acetylglucosaminidase (OGA) with thiamet G (TMG) is an alternative option for accumulating O-GlcNAcylated proteins. In this study, we investigate the neuroprotective effect of TMG in a mouse model of experimental stroke...
November 18, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27864465/posttraumatic-therapeutic-hypothermia-alters-microglial-and-macrophage-polarization-toward-a-beneficial-phenotype
#9
Jessie S Truettner, Helen M Bramlett, W Dalton Dietrich
Posttraumatic inflammatory processes contribute to pathological and reparative processes observed after traumatic brain injury (TBI). Recent findings have emphasized that these divergent effects result from subsets of proinflammatory (M1) or anti-inflammatory (M2) microglia and macrophages. Therapeutic hypothermia has been tested in preclinical and clinical models of TBI to limit secondary injury mechanisms including proinflammatory processes. This study evaluated the effects of posttraumatic hypothermia (PTH) on phenotype patterns of microglia/macrophages...
November 18, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27864464/inhibition-of-stress-fiber-formation-preserves-blood-brain-barrier-after-intracerebral-hemorrhage-in-mice
#10
Anatol Manaenko, Peng Yang, Derek Nowrangi, Enkhjargal Budbazar, Richard E Hartman, Andre Obenaus, William J Pearce, John H Zhang, Jiping Tang
*Anatol Manaenko and Peng Yang contributed equally to this work.Intracerebral hemorrhage (ICH) represents the deadliest subtype of all strokes. The development of brain edema, a consequence of blood-brain barrier (BBB) disruption, is the most life-threatening event after ICH. Pathophysiological conditions activate the endothelium, one of the components of BBB, inducing rearrangement of the actin cytoskeleton. Upon activation, globular actin assembles into a filamentous actin resulting in the formation of contractile actin bundles, stress fibers...
November 18, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27864463/increased-brain-hemopexin-levels-improve-outcomes-after-intracerebral-hemorrhage
#11
Jenna L Leclerc, Juan Santiago-Moreno, Alex Dang, Andrew S Lampert, Pedro E Cruz, Awilda M Rosario, Todd E Golde, Sylvain Doré
Following intracerebral hemorrhage (ICH), extracellular heme precipitates secondary brain injury, which results in irreversible brain damage and enduring neurological deficits. Hemopexin (Hpx) is an endogenous protein responsible for scavenging heme, thereby modulating its intrinsic proxidant/proinflammatory properties. Although Hpx is present in the brain, the endogenous levels are insufficient to combat the massive heme overload following ICH. We hypothesized that increasing brain Hpx levels would improve ICH outcomes...
November 18, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27864462/collateral-status-and-tissue-outcome-after-intra-arterial-therapy-for-patients-with-acute-ischemic-stroke
#12
Anna Mm Boers, Ivo Gh Jansen, Olvert A Berkhemer, Albert J Yoo, Hester F Lingsma, Cornelis H Slump, Yvo Bwem Roos, Robert J van Oostenbrugge, Diederik Wj Dippel, Aad van der Lugt, Wim H van Zwam, Henk A Marquering, Charles Blm Majoie
*These authors contributed equally to this work. †A list of all MR CLEAN Investigators is given in Appendix 1Intra-arterial therapy (IAT) for ischemic stroke aims to save brain tissue. Collaterals are thought to contribute to prolonged penumbra sustenance. In this study, we investigate the effect of collateral status on brain tissue salvage with IAT. In 500 patients randomized between IAT and standard care, collateral status was graded from 0 (absent) to 3 (good). Final infarct volumes (FIV) were calculated on post-treatment CT...
November 18, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27837191/age-associated-physiological-and-pathological-changes-at-the-blood-brain-barrier-a-review
#13
REVIEW
Franciska Erdő, László Denes, Elizabeth de Lange
The age-associated decline of the neurological and cognitive functions becomes more and more serious challenge for the developed countries with the increasing number of aged populations. The morphological and biochemical changes in the aging brain are the subjects of many extended research projects worldwide for a long time. However, the crucial role of the blood-brain barrier (BBB) impairment and disruption in the pathological processes in age-associated neurodegenerative disorders received special attention just for a few years...
November 11, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27837190/hyperoxia-results-in-increased-aerobic-metabolism-following-acute-brain-injury
#14
Arnab Ghosh, David Highton, Christina Kolyva, Ilias Tachtsidis, Clare E Elwell, Martin Smith
Acute brain injury is associated with depressed aerobic metabolism. Below a critical mitochondrial pO2 cytochrome c oxidase, the terminal electron acceptor in the mitochondrial respiratory chain, fails to sustain oxidative phosphorylation. After acute brain injury, this ischaemic threshold might be shifted into apparently normal levels of tissue oxygenation. We investigated the oxygen dependency of aerobic metabolism in 16 acutely brain-injured patients using a 120-min normobaric hyperoxia challenge in the acute phase (24-72 h) post-injury and multimodal neuromonitoring, including transcranial Doppler ultrasound-measured cerebral blood flow velocity, cerebral microdialysis-derived lactate-pyruvate ratio (LPR), brain tissue pO2 (pbrO2), and tissue oxygenation index and cytochrome c oxidase oxidation state (oxCCO) measured using broadband spectroscopy...
November 11, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27837189/middle-cerebral-artery-diameter-changes-during-rhythmic-handgrip-exercise-in-humans
#15
J Verbree, Agt Bronzwaer, M A van Buchem, Mjap Daemen, J J van Lieshout, Mjp van Osch
Transcranial Doppler (TCD) sonography is a frequently employed technique for quantifying cerebral blood flow by assuming a constant arterial diameter. Given that exercise increases arterial pressure by sympathetic activation, we hypothesized that exercise might induce a change in the diameter of large cerebral arteries. Middle cerebral artery (MCA) cross-sectional area was assessed in response to handgrip exercise by direct magnetic resonance imaging (MRI) observations. Twenty healthy subjects (11 female) performed three 5 min bouts of rhythmic handgrip exercise at 60% maximum voluntary contraction, alternated with 5 min of rest...
November 11, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27837188/capsular-stroke-modeling-based-on-somatotopic-mapping-of-motor-fibers
#16
Hanlim Song, Wonbin Jung, Eulgi Lee, Ji-Young Park, Min Sun Kim, Min-Cheol Lee, Hyoung-Ihl Kim
Recently, several capsular stroke models have been reported with different targets of destruction. This study was performed to establish an accurate internal capsule (IC) target for capsular stroke modeling in rats. We injected adeno-associated virus serotype 5 (AAV)-CaMKII-EYFP into forelimb motor cortex and AAV-CaMKII-mCherry into hindlimb motor cortex (n = 9) to anterogradely trace the pyramidal fibers and map their somatotopic distribution in the IC. On the basis of the neural tracing results, we created photothrombotic infarct lesions in rat forelimb and hindlimb motor fiber (FMF and HMF) areas of the IC (n = 29) and assessed motor behavior using a forelimb-use asymmetry test, a foot-fault test, and a single-pellet reaching test...
November 11, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27834284/brain-energy-metabolism-and-neuroinflammation-in-ageing-app-ps1-21-mice-using-longitudinal-18f-fdg-and-18f-dpa-714-pet-imaging
#17
Jatta S Takkinen, Francisco R López-Picón, Rana Al Majidi, Olli Eskola, Anna Krzyczmonik, Thomas Keller, Eliisa Löyttyniemi, Olof Solin, Juha O Rinne, Merja Haaparanta-Solin
Preclinical animal model studies of brain energy metabolism and neuroinflammation in Alzheimer's disease have produced conflicting results, hampering both the elucidation of the underlying disease mechanism and the development of effective Alzheimer's disease therapies. Here, we aimed to quantify the relationship between brain energy metabolism and neuroinflammation in the APP/PS1-21 transgenic mouse model of Alzheimer's disease using longitudinal in vivo (18)F-FDG and (18)F-DPA-714) PET imaging and ex vivo brain autoradiography...
November 8, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27834283/cerebral-glycogen-in-humans-following-acute-and-recurrent-hypoglycemia-implications-on-a-role-in-hypoglycemia-unawareness
#18
Gülin Öz, Mauro DiNuzzo, Anjali Kumar, Amir Moheet, Ameer Khowaja, Kristine Kubisiak, Lynn E Eberly, Elizabeth R Seaquist
Supercompensated brain glycogen levels may contribute to the development of hypoglycemia-associated autonomic failure (HAAF) following recurrent hypoglycemia (RH) by providing energy for the brain during subsequent periods of hypoglycemia. To assess the role of glycogen supercompensation in the generation of HAAF, we estimated the level of brain glycogen following RH and acute hypoglycemia (AH). After undergoing 3 hyperinsulinemic, euglycemic and 3 hyperinsulinemic, hypoglycemic clamps (RH) on separate occasions at least 1 month apart, five healthy volunteers received [1-(13)C]glucose intravenously over 80+ h while maintaining euglycemia...
November 8, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27815419/altered-hippocampal-arteriole-structure-and-function-in-a-rat-model-of-preeclampsia-potential-role-in-impaired-seizure-induced-hyperemia
#19
Abbie C Johnson, Marilyn J Cipolla
We investigated the effect of experimental preeclampsia on hyperemia during seizure in the hippocampus and vascular function and structure of hippocampal arterioles using Sprague Dawley rats (n = 14/group) that were nonpregnant, pregnant (d20), or had experimental preeclampsia (induced by a high cholesterol diet d7-20). Hyperemia was measured via hydrogen clearance basally and during pentylenetetrazol-induced seizure (40-130 mg/kg i.v.). Reactivity of isolated and pressurized hippocampal arterioles to KCl, nitric oxide synthase inhibition with NG-nitro-L-arginine methyl ester and the nitric oxide donor sodium nitroprusside were investigated...
November 4, 2016: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/27789786/non-invasive-near-infrared-fluorescence-imaging-of-the-neutrophil-response-in-a-mouse-model-of-transient-cerebral-ischaemia
#20
Markus Vaas, Gaby Enzmann, Therese Perinat, Ulrich Siler, Janine Reichenbach, Kai Licha, Anja Kipar, Markus Rudin, Britta Engelhardt, Jan Klohs
Near-infrared fluorescence (NIRF) imaging enables non-invasive monitoring of molecular and cellular processes in live animals. Here we demonstrate the suitability of NIRF imaging to investigate the neutrophil response in the brain after transient middle cerebral artery occlusion (tMCAO). We established procedures for ex vivo fluorescent labelling of neutrophils without affecting their activation status. Adoptive transfer of labelled neutrophils in C57BL/6 mice before surgery resulted in higher fluorescence intensities over the ischaemic hemisphere in tMCAO mice with NIRF imaging when compared with controls, corroborated by ex vivo detection of labelled neutrophils using fluorescence microscopy...
October 27, 2016: Journal of Cerebral Blood Flow and Metabolism
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