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Neurovascular coupling

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https://www.readbyqxmd.com/read/29770594/functional-optical-coherence-tomography-of-neurovascular-coupling-interactions-in-the-retina
#1
Taeyoon Son, Minhaj Alam, Devrim Toslak, Benquan Wang, Yiming Lu, Xincheng Yao
Quantitative evaluation of retinal neurovascular coupling is essential for a better understanding of visual function and early detection of eye diseases. However, there is no established method to monitor coherent interactions between stimulus-evoked neural activity and hemodynamic responses at high resolution. Here we report a multi-modal functional optical coherence tomography (OCT) imaging methodology to enable concurrent intrinsic optical signal (IOS) imaging of stimulus-evoked neural activity and hemodynamic responses at capillary resolution...
May 16, 2018: Journal of Biophotonics
https://www.readbyqxmd.com/read/29757059/quantitative-hemodynamic-analysis-of-cerebral-blood-flow-and-neurovascular-coupling-using-optical-coherence-tomography-angiography
#2
Paul Shin, WooJhon Choi, JongYoon Joo, Wang-Yuhl Oh
Functional hyperemia in the rat cortex was investigated using high-speed optical coherence tomography (OCT) angiography and Doppler OCT. OCT angiography (OCTA) was performed to image the hemodynamic stimulus-response over a wide field of view. Temporal changes in vessel diameters in different vessel compartments, which were determined as the diameters of erythrocyte flows in OCT angiograms, were measured in order to monitor localized hemodynamic changes. Our results showed that the dilation of arterioles at the site of activation was accompanied by the dilation of upstream arteries...
January 1, 2018: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29752872/functional-neuroimaging-of-nociceptive-and-pain-related-activity-in-the-spinal-cord-and-brain-insights-from-neurovascular-coupling-studies
#3
Thierry Paquette, Renaud Jeffrey-Gauthier, Hugues Leblond, Mathieu Piché
Spinal cord and brain processes underlie pain perception, which produces systemic cardiovascular changes. In turn, the autonomic nervous system regulates vascular function in the spinal cord and brain in order to adapt to these systemic changes, while neuronal activity induces local vascular changes. Thus, autonomic regulation and pain processes in the brain and spinal cord are tightly linked and interrelated. The objective of this topical review is to discuss work on neurovascular coupling during nociceptive processing in order to highlight supporting evidence and limitations for the use of cerebral and spinal fMRI to investigate pain mechanisms and spinal nociceptive processes...
May 12, 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29706581/cortical-circuit-activity-evokes-rapid-astrocyte-calcium-signals-on-a-similar-timescale-to-neurons
#4
Jillian L Stobart, Kim David Ferrari, Matthew J P Barrett, Chaim Glück, Michael J Stobart, Marc Zuend, Bruno Weber
Sensory stimulation evokes intracellular calcium signals in astrocytes; however, the timing of these signals is disputed. Here, we used novel combinations of genetically encoded calcium indicators for concurrent two-photon imaging of cortical astrocytes and neurons in awake mice during whisker deflection. We identified calcium responses in both astrocyte processes and endfeet that rapidly followed neuronal events (∼120 ms after). These fast astrocyte responses were largely independent of IP3 R2-mediated signaling and known neuromodulator activity (acetylcholine, serotonin, and norepinephrine), suggesting that they are evoked by local synaptic activity...
April 20, 2018: Neuron
https://www.readbyqxmd.com/read/29688625/the-use-of-intensity-based-doppler-variance-method-for-single-vessel-response-to-functional-neurovascular-activation
#5
Wen-Chuan Kuo, Yue-Ming Kuo, Jia-Pu Syu, Han-Lin Wang, Chi-Ming Lai, Jia-Wei Chen, Yu-Chun Lo, You-Yin Chen
This study presents one use of optical coherence tomography angiography (OCT) technique to examine neurovascular coupling effect. Repeated B-scans OCT recording is performed on the rat somatosensory cortex with cranial window preparation while its contra-lateral forepaw is electrically stimulated to activate the neurons in rest. We use an intensity-based Doppler variance (IBDV) algorithm mapped cerebral blood vessels in the cortex, and the temporal alteration in blood perfusion during neurovascular activation is analyzed using the proposed IBDV quantitative parameters...
April 24, 2018: Journal of Biophotonics
https://www.readbyqxmd.com/read/29687902/impact-of-metabolic-diseases-on-cerebral-circulation-structural-and-functional-consequences
#6
Maha Coucha, Mohammed Abdelsaid, Rebecca Ward, Yasir Abdul, Adviye Ergul
Metabolic diseases including obesity, insulin resistance, and diabetes have profound effects on cerebral circulation. These diseases not only affect the architecture of cerebral blood arteries causing adverse remodeling, pathological neovascularization, and vasoregression but also alter the physiology of blood vessels resulting in compromised myogenic reactivity, neurovascular uncoupling, and endothelial dysfunction. Coupled with the disruption of blood brain barrier (BBB) integrity, changes in blood flow and microbleeds into the brain rapidly occur...
March 25, 2018: Comprehensive Physiology
https://www.readbyqxmd.com/read/29681886/importance-of-collateralization-in-patients-with-large-artery-intracranial-occlusive-disease-long-term-longitudinal-assessment-of-cerebral-hemodynamic-function
#7
Larissa McKetton, Lakshmikumar Venkatraghavan, Julien Poublanc, Olivia Sobczyk, Adrian P Crawley, Casey Rosen, Frank L Silver, James Duffin, Joseph A Fisher, David J Mikulis
Patients with large artery intracranial occlusive disease (LAICOD) are at risk for both acute ischemia and chronic hypoperfusion. Collateral circulation plays an important role in prognosis, and imaging plays an essential role in diagnosis, treatment planning, and prognosis of patients with LAICOD. In addition to standard structural imaging, assessment of cerebral hemodynamic function is important to determine the adequacy of collateral supply. Among the currently available methods of assessment of cerebral hemodynamic function, measurement of cerebrovascular reactivity (CVR) using blood oxygen level-dependent (BOLD) MRI and precisely controlled CO2 has shown to be a safe, reliable, reproducible, and clinically useful method for long-term assessment of patients...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29656926/resting-state-cerebral-blood-flow-with-arterial-spin-labeling-mri-in-developing-human-brains
#8
Feng Liu, Yunsuo Duan, Bradley S Peterson, Iris Asllani, Fernando Zelaya, David Lythgoe, Alayar Kangarlu
The development of brain circuits is coupled with changes in neurovascular coupling, which refers to the close relationship between neural activity and cerebral blood flow (CBF). Studying the characteristics of CBF during resting state in developing brain can be a complementary way to understand the functional connectivity of the developing brain. Arterial spin labeling (ASL), as a noninvasive MR technique, is particularly attractive for studying cerebral perfusion in children and even newborns. We have collected pulsed ASL data in resting state for 47 healthy subjects from young children to adolescence (aged from 6 to 20 years old)...
March 24, 2018: European Journal of Paediatric Neurology: EJPN
https://www.readbyqxmd.com/read/29649559/ultrafast-doppler-for-neonatal-brain-imaging
#9
REVIEW
Charlie Demené, Jérôme Mairesse, Jérôme Baranger, Mickael Tanter, Olivier Baud
The emergence of functional neuroimaging has dramatically accelerated our understanding of the human mind. The advent of functional Magnetic Resonance Imaging paved the way for the next decades' major discoveries in neuroscience and today remains the "gold standard" for deep brain imaging. Recent improvements in imaging technology have been somewhat limited to incremental innovations of mature techniques instead of breakthroughs. Recently, the use of ultrasonic plane waves transmitted at ultrafast frame rates was shown to highly increase Doppler ultrasound sensitivity to blood flows in small vessels in rodents...
April 10, 2018: NeuroImage
https://www.readbyqxmd.com/read/29615883/effective-connectivity-in-response-to-posture-changes-in-elderly-subjects-as-assessed-using-functional-near-infrared-spectroscopy
#10
Congcong Huo, Ming Zhang, Lingguo Bu, Gongcheng Xu, Ying Liu, Zengyong Li, Lingling Sun
This study aims to assess the posture-related changes in frequency-specific effective connectivity (EC) in elderly subjects by coupling function measured using functional near-infrared spectroscopy (fNIRS). The fNIRS signals were continuously recorded from the bilateral prefrontal cortex (PFC), motor cortex (MC), and occipital lobe (OL) in 17 healthy elderly and 19 healthy young subjects during sitting and standing states. EC was calculated based on Dynamic Bayesian inference in one low frequency interval I: 0...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29600499/isoflurane-anesthesia-does-not-affect-spinal-cord-neurovascular-coupling-evidence-from-decerebrated-rats
#11
Thierry Paquette, Hugues Leblond, Mathieu Piché
Neurological examination remains the primary clinical investigation in patients with spinal cord injury. However, neuroimaging methods such as functional magnetic resonance imaging (fMRI) are promising tools for following functional changes in the course of injury, disease and rehabilitation. However, the relationship between neuronal activity and blood flow in the spinal cord on which fMRI relies has been largely overlooked. The objective of this study was to examine neurovascular coupling in the spinal cord of decerebrated rats during electrical stimulation of the sciatic nerve with and without isoflurane anesthesia (1...
March 29, 2018: Journal of Physiological Sciences: JPS
https://www.readbyqxmd.com/read/29581463/engineered-3d-vascular-and-neuronal-networks-in-a-microfluidic-platform
#12
Tatsuya Osaki, Vivek Sivathanu, Roger D Kamm
Neurovascular coupling plays a key role in the pathogenesis of neurodegenerative disorders including motor neuron disease (MND). In vitro models provide an opportunity to understand the pathogenesis of MND, and offer the potential for drug screening. Here, we describe a new 3D microvascular and neuronal network model in a microfluidic platform to investigate interactions between these two systems. Both 3D networks were established by co-culturing human embryonic stem (ES)-derived MN spheroids and endothelial cells (ECs) in microfluidic devices...
March 26, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29581272/endothelial-gqpcr-activity-controls-capillary-electrical-signaling-and-brain-blood-flow-through-pip-2-depletion
#13
Osama F Harraz, Thomas A Longden, Fabrice Dabertrand, David Hill-Eubanks, Mark T Nelson
Brain capillaries play a critical role in sensing neural activity and translating it into dynamic changes in cerebral blood flow to serve the metabolic needs of the brain. The molecular cornerstone of this mechanism is the capillary endothelial cell inward rectifier K+ (Kir2.1) channel, which is activated by neuronal activity-dependent increases in external K+ concentration, producing a propagating hyperpolarizing electrical signal that dilates upstream arterioles. Here, we identify a key regulator of this process, demonstrating that phosphatidylinositol 4,5-bisphosphate (PIP2 ) is an intrinsic modulator of capillary Kir2...
March 26, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29580963/neurovascular-coupling-during-visual-stimulation-in-multiple-sclerosis-a-meg-fmri-study
#14
Rachael Stickland, Marek Allen, Lorenzo Magazzini, Krish D Singh, Richard G Wise, Valentina Tomassini
The process of neurovascular coupling ensures that increases in neuronal activity are fed by increases in cerebral blood flow. Evidence suggests that neurovascular coupling may be impaired in multiple sclerosis (MS) due to a combination of brain hypoperfusion, altered cerebrovascular reactivity and oxygen metabolism, and altered levels of vasoactive compounds. Here, we tested the hypothesis that neurovascular coupling is impaired in MS. We characterised neurovascular coupling as the relationship between changes in neuronal oscillatory power within the gamma frequency band (30-80 Hz), as measured by magnetoencephalography (MEG), and associated haemodynamic changes (blood oxygenation level dependent, BOLD, and cerebral blood flow, CBF)as measured by functional MRI...
March 23, 2018: Neuroscience
https://www.readbyqxmd.com/read/29561829/the-role-of-endothelial-ca-2-signaling-in-neurovascular-coupling-a-view-from-the-lumen
#15
REVIEW
Germano Guerra, Angela Lucariello, Angelica Perna, Laura Botta, Antonio De Luca, Francesco Moccia
BACKGROUND: Neurovascular coupling (NVC) is the mechanism whereby an increase in neuronal activity (NA) leads to local elevation in cerebral blood flow (CBF) to match the metabolic requirements of firing neurons. Following synaptic activity, an increase in neuronal and/or astrocyte Ca2+ concentration leads to the synthesis of multiple vasoactive messengers. Curiously, the role of endothelial Ca2+ signaling in NVC has been rather neglected, although endothelial cells are known to control the vascular tone in a Ca2+ -dependent manner throughout peripheral vasculature...
March 21, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29553570/skeletal-muscle-neurovascular-coupling-oxidative-capacity-and-microvascular-function-with-one-stop-shop-near-infrared-spectroscopy
#16
Ryan Rosenberry, Susie Chung, Michael D Nelson
Exercise represents a major hemodynamic stress that demands a highly coordinated neurovascular response in order to match oxygen delivery to metabolic demand. Reactive hyperemia (in response to a brief period of tissue ischemia) is an independent predictor of cardiovascular events and provides important insight into vascular health and vasodilatory capacity. Skeletal muscle oxidative capacity is equally important in health and disease, as it determines the energy supply for myocellular processes. Here, we describe a simple, non-invasive approach using near-infrared spectroscopy to assess each of these major clinical endpoints (reactive hyperemia, neurovascular coupling, and muscle oxidative capacity) during a single clinic or laboratory visit...
February 20, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29545211/ling-yang-gou-teng-decoction-prevents-vascular-dementia-through-inhibiting-oxidative-stress-induced-neurovascular-coupling-dysfunction
#17
Xin Zhao, Jinyu Liu, Shijun Yang, Dandan Song, Chen Wang, Chen Chen, Xiaoya Li, Qiuting Wang, Shasha Ge, Runmei Yang, Xiuhua Liu, Yulin Lin, Dayong Cai
ETHNOPHARMACOLOGICAL RELEVANCE: Vascular dementia (VaD) is the common cognitive disorder derived mainly from lacunar stroke (LS). The oxidative stress induced neurovascular coupling (NVC) dysfunction involves in the pathogenesis of VaD. Currently, there is no specific drug for VaD. Ling-Yang-Gou-Teng -Decoction (LG), a well-known traditional Chinese formula, has been used for preventing VaD in clinic. AIM OF THE STUDY: In this study, we aimed to investigate the underlying mechanism of LG on VaD in rats...
March 12, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29526745/integrated-models-of-neurovascular-coupling-and-bold-signals-responses-for-varying-neural-activations
#18
Elshin J Mathias, Allanah Kenny, Michael J Plank, Tim David
A state-of-the-art integrated model of neurovascular coupling (NVC) (Dormanns et al., 2015b; Dormanns et al., 2016; Kenny et al., 2018) and the BOLD response (Mathias et al., 2017a; Mathias et al., 2017b) is presented with the ability to simulate the fMRI BOLD responses due to continuous neuronal spiking, bursting and cortical spreading depression (CSD) along with the underlying complex vascular coupling. Simulated BOLD responses are compared to experimental BOLD signals observed in the rat barrel cortex and in the hippocampus under seizure conditions showing good agreement...
July 1, 2018: NeuroImage
https://www.readbyqxmd.com/read/29526715/a-novel-pharmacodynamic-model-in-rats-for-preventing-vascular-dementia-from-maintaining-neurovascular-coupling-sensitivity
#19
Xin Zhao, Jinyu Liu, Shijun Yang, Dandan Song, Chen Wang, Chen Chen, Chengcheng Wang, Feifei Pu, Runmei Yang, Xiaoya Li, Qiuting Wang, Shasha Ge, Yulin Lin, Xiuhua Liu, Dayong Cai
Vascular dementia (VaD) is the common cognitive disorder derived mainly from lacunar stroke. The neurovascular coupling (NVC) dysfunction involves in its pathogenesis. VaD lacks suitable animal models for developing preventive therapies. This study aimed to confirm a model for preventing VaD via maintaining NVC sensitivity in rats. The model was replicated with autologous microthrombi against the background of hypercholesterolemia. A phosphodiesterase inhibitor (pentoxyfylline) was preventively administrated to confirm the role of NVC sensitivity...
May 15, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29520227/disruption-of-accumbens-and-thalamic-white-matter-connectivity-revealed-by-diffusion-tensor-tractography-in-young-men-with-genetic-risk-for-obesity
#20
Gaia Olivo, Francesco Latini, Lyle Wiemerslage, Elna-Marie Larsson, Helgi B Schiöth
Background : Neurovascular coupling is associated with white matter (WM) structural integrity, and it is regulated by specific subtypes of dopaminergic receptors. An altered activity of such receptors, highly expressed in reward-related regions, has been reported in carriers of obesity-risk alleles of the fat mass and obesity associated ( FTO ) gene. Among the reward-related regions, the thalamus and the nucleus accumbens are particularly vulnerable to blood pressure dysregulation due to their peculiar anatomo-vascular characteristics, and have been consistently reported to be altered in early-stage obesity...
2018: Frontiers in Human Neuroscience
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