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https://www.readbyqxmd.com/read/28687812/blast-induced-tinnitus-and-elevated-central-auditory-and-limbic-activity-in-rats-a-manganese-enhanced-mri-and-behavioral-study
#1
Jessica Ouyang, Edward Pace, Laura Lepczyk, Michael Kaufman, Jessica Zhang, Shane A Perrine, Jinsheng Zhang
Blast-induced tinitus is the number one service-connected disability that currently affects military personnel and veterans. To elucidate its underlying mechanisms, we subjected 13 Sprague Dawley adult rats to unilateral 14 psi blast exposure to induce tinnitus and measured auditory and limbic brain activity using manganese-enhanced MRI (MEMRI). Tinnitus was evaluated with a gap detection acoustic startle reflex paradigm, while hearing status was assessed with prepulse inhibition (PPI) and auditory brainstem responses (ABRs)...
July 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28678440/automated-computational-processing-of-3-d-mr-images-of-mouse-brain-for-phenotyping-of-living-animals
#2
Christopher S Medina, Brett Manifold-Wheeler, Aaron Gonzales, Elaine L Bearer
Magnetic resonance (MR) imaging provides a method to obtain anatomical information from the brain in vivo that is not typically available by optical imaging because of this organ's opacity. MR is nondestructive and obtains deep tissue contrast with 100-µm(3) voxel resolution or better. Manganese-enhanced MRI (MEMRI) may be used to observe axonal transport and localized neural activity in the living rodent and avian brain. Such enhancement enables researchers to investigate differences in functional circuitry or neuronal activity in images of brains of different animals...
July 5, 2017: Current Protocols in Molecular Biology
https://www.readbyqxmd.com/read/28646692/specific-subcortical-structures-are-activated-during-seizure-induced-death-in-a-model-of-sudden-unexpected-death-in-epilepsy-sudep-a-manganese-enhanced-magnetic-resonance-imaging-study
#3
Srinivasa P Kommajosyula, Marcus E Randall, Thomas J Brozoski, Boris M Odintsov, Carl L Faingold
Sudden unexpected death in epilepsy (SUDEP) is a major concern for patients with epilepsy. In most witnessed cases of SUDEP generalized seizures and respiratory failure preceded death, and pre-mortem neuroimaging studies in SUDEP patients observed changes in specific subcortical structures. Our study examined the role of subcortical structures in the DBA/1 mouse model of SUDEP using manganese-enhanced magnetic resonance imaging (MEMRI). These mice exhibit acoustically-evoked generalized seizures leading to seizure-induced respiratory arrest (S-IRA) that results in sudden death unless resuscitation is rapidly instituted...
May 25, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28633971/manganese-enhanced-magnetic-resonance-imaging-depicts-brain-activity-in-models-of-acute-and-chronic-pain-a-new-window-to-study-experimental-spontaneous-pain
#4
I M Devonshire, J J Burston, L Xu, A Lillywhite, M J Prior, D J G Watson, C M Greenspon, S J Iwabuchi, D P Auer, V Chapman
Application of functional imaging techniques to animal models is vital to understand pain mechanisms, but is often confounded by the need to limit movement artefacts with anaesthesia, and a focus on evoked responses rather than clinically relevant spontaneous pain and related hyperalgesia. The aim of the present study was to investigate the potential of manganese-enhanced magnetic resonance imaging (MEMRI) to measure neural responses during on-going pain that underpins hyperalgesia in pre-clinical models of nociception...
June 17, 2017: NeuroImage
https://www.readbyqxmd.com/read/28579797/manganese-enhanced-magnetic-resonance-imaging-and-studies-of-rat-behavior-transient-motor-deficit-in-skilled-reaching-rears-and-activity-in-rats-after-a-single-dose-of-mncl2
#5
Mariam Alaverdashvili, Valerie Lapointe, Ian Q Whishaw, Albert R Cross
Manganese-enhanced magnetic resonance imaging (MEMRI) has been suggested to be a useful tool to visualize and map behavior-relevant neural populations at large scale in freely behaving rodents. A primary concern in MEMRI applications is Mn(2+) toxicity. Although a few studies have specifically examined toxicity on gross motor behavior, Mn(2+) toxicity on skilled motor behavior was not explored. Thus, the objective of this study was to combine manganese as a functional contrast agent with comprehensive behavior evaluation...
2017: Magnetic Resonance Insights
https://www.readbyqxmd.com/read/28539242/manganese-enhanced-mr-imaging-memri-combined-with-electrophysiology-in-the-study-of-cross-modal-plasticity-in-binocularly-blind-rats
#6
Zuohua Tang, Lingjie Wu, Zebin Xiao, Xinghuai Sun, Xiaoyuan Feng, Qian Chen, Jiawen Fan, Jie Wang, Wentao Wang, Jianfeng Luo, Lixin Jin
Our study aimed to determine and verify the establishment of visual to auditory cross-modal plasticity using manganese-enhanced MR imaging (MEMRI) combined with examinations of the visual evoked potential (VEP), auditory brainstem response (ABR) and bilateral visual cortex response to a bilateral auditory stimulus (AVR). Fourteen healthy male Sprague-Dawley newborn rats were randomly divided into 2 groups (n=7 per group). Optic nerve transection was performed in the 7 rats of Group A three weeks after birth to obtain binocularly blind models, and the 7 rats of Group B were maintained as the control group...
May 21, 2017: International Journal of Developmental Neuroscience
https://www.readbyqxmd.com/read/28528319/quantitative-dla-based-compressed-sensing-for-t1-weighted-acquisitions
#7
Pavel Svehla, Khieu-Van Nguyen, Jing-Rebecca Li, Luisa Ciobanu
High resolution Manganese Enhanced Magnetic Resonance Imaging (MEMRI), which uses manganese as a T1 contrast agent, has great potential for functional imaging of live neuronal tissue at single neuron scale. However, reaching high resolutions often requires long acquisition times which can lead to reduced image quality due to sample deterioration and hardware instability. Compressed Sensing (CS) techniques offer the opportunity to significantly reduce the imaging time. The purpose of this work is to test the feasibility of CS acquisitions based on Diffusion Limited Aggregation (DLA) sampling patterns for high resolution quantitative T1-weighted imaging...
May 9, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28506873/transcranial-manganese-delivery-for-neuronal-tract-tracing-using-memri
#8
Tatjana Atanasijevic, Nadia Bouraoud, Dorian B McGavern, Alan P Koretsky
There has been a growing interest in the use of manganese-enhanced MRI (MEMRI) for neuronal tract tracing in mammals, especially in rodents. For this MEMRI application, manganese solutions are usually directly injected into specific brain regions. Recently it was reported that manganese ions can diffuse through intact rat skull. Here the local manganese concentrations in the brain tissue after transcranial manganese application were quantified and the effectiveness of tracing from the area under the skull where delivery occurred was determined...
May 13, 2017: NeuroImage
https://www.readbyqxmd.com/read/28500878/identification-of-changes-in-neuronal-function-as-a-consequence-of-aging-and-tauopathic-neurodegeneration-using-a-novel-and-sensitive-magnetic-resonance-imaging-approach
#9
Sarah N Fontaine, Alexandria Ingram, Ryan A Cloyd, Shelby E Meier, Emily Miller, Danielle Lyons, Grant K Nation, Elizabeth Mechas, Blaine Weiss, Chiara Lanzillotta, Fabio Di Domenico, Frederick Schmitt, David K Powell, Moriel Vandsburger, Jose F Abisambra
Tauopathies, the most common of which is Alzheimer's disease (AD), constitute the most crippling neurodegenerative threat to our aging population. Tauopathic patients have significant cognitive decline accompanied by irreversible and severe brain atrophy, and it is thought that neuronal dysfunction begins years before diagnosis. Our current understanding of tauopathies has yielded promising therapeutic interventions but have all failed in clinical trials. This is partly due to the inability to identify and intervene in an effective therapeutic window early in the disease process...
April 18, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28391012/mapping-of-pain-circuitry-in-early-post-natal-development-using-manganese-enhanced-mri-in-rats
#10
M M Sperry, B M Kandel, S Wehrli, K N Bass, S R Das, P S Dhillon, J C Gee, G A Barr
Premature or ill full-term infants are subject to a number of noxious procedures as part of their necessary medical care. Although we know that human infants show neural changes in response to such procedures, we know little of the sensory or affective brain circuitry activated by pain. In rodent models, the focus has been on spinal cord and, more recently, midbrain and medulla. The present study assesses activation of brain circuits using manganese-enhanced magnetic resonance imaging (MEMRI). Uptake of manganese, a paramagnetic contrast agent that is transported across active synapses and along axons, was measured in response to a hindpaw injection of dilute formalin in 12-day-old rat pups, the age at which rats begin to show aversion learning and which is roughly the equivalent of full-term human infants...
June 3, 2017: Neuroscience
https://www.readbyqxmd.com/read/28337287/memri-is-a-biomarker-defining-nicotine-specific-neuronal-responses-in-subregions-of-the-rodent-brain
#11
Aditya N Bade, Howard E Gendelman, Michael D Boska, Yutong Liu
Nicotine dependence is defined by dopaminergic neuronal activation within the nucleus accumbens (ACB) and by affected neural projections from nicotine-stimulated neurons. Control of any subsequent neural activities would underpin any smoking cessation strategy. While extensive efforts have been made to study the pathophysiology of nicotine addiction, more limited works were developed to find imaging biomarkers. If such biomarkers are made available, addictive behaviors could be monitored noninvasively. To such ends, we employed manganese (Mn(2+))-enhanced magnetic resonance imaging (MEMRI) to determine whether it could be used to monitor neuronal activities after acute and chronic nicotine exposure in rats...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28236167/cocaine-differentially-affects-synaptic-activity-in-memory-and-midbrain-areas-of-female-and-male-rats-an-in-vivo-memri-study
#12
Pablo D Perez, Gabrielle Hall, Jasenka Zubcevic, Marcelo Febo
Manganese enhanced magnetic resonance imaging (MEMRI) has been previously used to determine the effect of acute cocaine on calcium-dependent synaptic activity in male rats. However, there have been no MEMRI studies examining sex differences in the functional neural circuits affected by repeated cocaine. In the present study, we used MEMRI to investigate the effects of repeated cocaine on brain activation in female and male rats. Adult female and male rats were scanned at 4.7 Tesla three days after final treatment with saline, a single cocaine injection (15 mg kg(-1), i...
February 24, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28119154/conductive-nanogel-interfaced-neural-microelectrode-arrays-with-electrically-controlled-in-situ-delivery-of-manganese-ions-enabling-high-resolution-memri-for-synchronous-neural-tracing-with-deep-brain-stimulation
#13
Wei-Chen Huang, Yu-Chih Lo, Chao-Yi Chu, Hsin-Yi Lai, You-Yin Chen, San-Yuan Chen
Chronic brain stimulation has become a promising physical therapy with increased efficacy and efficiency in the treatment of neurodegenerative diseases. The application of deep brain electrical stimulation (DBS) combined with manganese-enhanced magnetic resonance imaging (MEMRI) provides an unbiased representation of the functional anatomy, which shows the communication between areas of the brain responding to the therapy. However, it is challenging for the current system to provide a real-time high-resolution image because the incorporated MnCl2 solution through microinjection usually results in image blurring or toxicity due to the uncontrollable diffusion of Mn(2+)...
January 11, 2017: Biomaterials
https://www.readbyqxmd.com/read/27995976/in-vivo-memri-characterization-of-brain-metastases-using-a-3d-look-locker-t1-mapping-sequence
#14
Charles R Castets, Néha Koonjoo, Andreea Hertanu, Pierre Voisin, Jean-Michel Franconi, Sylvain Miraux, Emeline J Ribot
Although MEMRI (Manganese Enhanced MRI) informations were obtained on primary tumors in small animals, MEMRI data on metastases are lacking. Thus, our goal was to determine if 3D Look-Locker T1 mapping was an efficient method to evaluate Mn ions transport in brain metastases in vivo. The high spatial resolution in 3D (156 × 156 × 218 μm) of the sequence enabled to detect metastases of 0.3 mm(3). In parallel, the T1 quantitation enabled to distinguish three populations of MDA-MB-231 derived brain metastases after MnCl2 intravenous injection: one with a healthy blood-tumor barrier that did not internalize Mn(2+) ions, and two others, which T1 shortened drastically by 54...
December 20, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27984200/multi-system-state-shifts-and-cognitive-deficits-induced-by-chronic-morphine-during-abstinence
#15
Haichen Niu, Guanqun Zhang, Haiying Li, Qiang Zhang, Tongzhou Li, Sheng Ding, Lei Wang, Zhonghai Zhang, Yuehua Qiao, Min Hu
Chronic morphine administration induces neural plasticity followed by withdraw. And clinic observation indicates that obvious cognitive deficits are found during withdrawal. However, current neural substrates that regulate dysfunction in withdrawal are unknown. In our studies, chronic morphine administration was used to induce the spontaneous withdrawal model in rats. A series of cognitive abilities was tested to explore brain function. To further evaluate the neural substrates of dysfunction, Manganese-enhanced MRI(MEMRI) was used to map the dysfunctional regions in vivo...
October 29, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/27889621/identifying-non-toxic-doses-of-manganese-for-manganese-enhanced-magnetic-resonance-imaging-to-map-brain-areas-activated-by-operant-behavior-in-trained-rats
#16
Rita Gálosi, Csaba Szalay, Mihály Aradi, Gábor Perlaki, József Pál, Roy Steier, László Lénárd, Zoltán Karádi
Manganese-enhanced magnetic resonance imaging (MEMRI) offers unique advantages such as studying brain activation in freely moving rats, but its usefulness has not been previously evaluated during operant behavior training. Manganese in a form of MnCl2, at a dose of 20mg/kg, was intraperitoneally infused. The administration was repeated and separated by 24h to reach the dose of 40mg/kg or 60mg/kg, respectively. Hepatotoxicity of the MnCl2 was evaluated by determining serum aspartate aminotransferase, alanine aminotransferase, total bilirubin, albumin and protein levels...
November 24, 2016: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/27751944/hippocampal-to-basal-forebrain-transport-of-mn-2-is-impaired-by-deletion-of-klc1-a-subunit-of-the-conventional-kinesin-microtubule-based-motor
#17
Christopher S Medina, Octavian Biris, Tomas L Falzone, Xiaowei Zhang, Amber J Zimmerman, Elaine L Bearer
Microtubule-based motors carry cargo back and forth between the synaptic region and the cell body. Defects in axonal transport result in peripheral neuropathies, some of which are caused by mutations in KIF5A, a gene encoding one of the heavy chain isoforms of conventional kinesin-1. Some mutations in KIF5A also cause severe central nervous system defects in humans. While transport dynamics in the peripheral nervous system have been well characterized experimentally, transport in the central nervous system is less experimentally accessible and until now not well described...
January 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/27729278/memri-detects-neuronal-activity-and-connectivity-in-hypothalamic-neural-circuit-responding-to-leptin
#18
Anna Ulyanova, Xuan Vinh To, A B M A Asad, Weiping Han, Kai-Hsiang Chuang
Hypothalamus plays the central role in regulating energy homeostasis. To understand the hypothalamic neurocircuit in responding to leptin, Manganese-Enhanced MRI (MEMRI) was applied. Highly elevated signal could be mapped in major nuclei of the leptin signaling pathway, including the arcuate nucleus (ARC), paraventricular nucleus (PVN), ventromedial hypothalamus (VMH) and dorsomedial hypothalamus (DMH) in fasted mice and the enhancement was reduced by leptin administration. However, whether changes in MEMRI signal reflect Ca(2+) channel activity, neuronal activation or connectivity in the leptin signaling pathway are not clear...
February 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/27727394/melanopsin-phototransduction-contributes-to-light-evoked-choroidal-expansion-and-rod-l-type-calcium-channel-function-in-vivo
#19
Bruce A Berkowitz, Tiffany Schmidt, Robert H Podolsky, Robin Roberts
Purpose: In humans, rodents, and pigeons, the dark → light transition signals nonretinal brain tissue to increase choroidal thickness, a major control element of choroidal blood flow, and thus of photoreceptor and retinal pigment epithelium function. However, it is unclear which photopigments in the retina relay the light signal to the brain. Here, we test the hypothesis that melanopsin (Opn4)-regulated phototransduction modulates light-evoked choroidal thickness expansion in mice. Methods: Two-month-old C57Bl/6 wild-type (B6), 4- to 5-month-old C57Bl/6/129S6 wild-type (B6 + S6), and 2-month-old melanopsin knockout (Opn4-/-) on a B6 + S6 background were studied...
October 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27630707/dose-response-and-time-course-of-manganese-enhanced-magnetic-resonance-imaging-for-visual-pathway-tracing-in-vivo
#20
Wei-Ling Wang, Hui Xu, Ying Li, Zhi-Zhong Ma, Xiao-Dong Sun, Yun-Tao Hu
Axonal tracing is useful for detecting optic nerve injury and regeneration, but many commonly used methods cannot be used to observe axoplasmic flow and synaptic transmission in vivo. Manganese (Mn(2+))-enhanced magnetic resonance imaging (MEMRI) can be used for in vivo longitudinal tracing of the visual pathway. Here, we explored the dose response and time course of an intravitreal injection of MnCl2 for tracing the visual pathway in rabbits in vivo using MEMRI. We found that 2 mM MnCl2 enhanced images of the optic nerve but not the lateral geniculate body or superior colliculus, whereas at all other doses tested (5-40 mM), images of the visual pathway from the retina to the contralateral superior colliculus were significantly enhanced...
July 2016: Neural Regeneration Research
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