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https://www.readbyqxmd.com/read/29138510/high-fat-diet-induced-obesity-and-insulin-resistance-are-characterized-by-differential-beta-oscillatory-signaling-of-the-limbic-cortico-basal-ganglia-loop
#1
Lukas Maurer, Hui Tang, Jens K Haumesser, Jennifer Altschüler, Andrea A Kühn, Joachim Spranger, Christoph van Riesen
The concept of brain circuit disorders has been proposed for a variety of neuropsychiatric diseases, characterized by pathological disturbances of neuronal networks including changes in oscillatory signaling of re-entrant cortico-subcortical loops in the basal ganglia system. Parts of this circuitry play a pivotal role in energy homeostasis. We therefore investigated whether high-fat diet (HFD) induced obesity is associated with changes in oscillatory signaling in the limbic cortico-basal ganglia loop. We performed multi-site in-vivo electrophysiological recordings of local field potentials within this network under urethane anesthesia in adult rats after 4 weeks of HFD feeding compared to age-matched controls...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29134725/reproducibility-of-brain-mri-segmentation-algorithms-empirical-comparison-of-local-map-pstaple-freesurfer-and-fsl-first
#2
Clemente Velasco-Annis, Alireza Akhondi-Asl, Aymeric Stamm, Simon K Warfield
BACKGROUND AND PURPOSE: Segmentation of human brain structures is crucial for the volumetric quantification of brain disease. Advances in algorithmic approaches have led to automated techniques that save time compared to interactive methods. Recently, the utility and accuracy of template library fusion algorithms, such as Local MAP PSTAPLE (PSTAPLE), have been demonstrated but there is little guidance regarding its reproducibility compared to single template-based algorithms such as FreeSurfer and FSL-FIRST...
November 14, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29133954/exogenous-ghrelin-administration-increases-alcohol-self-administration-and-modulates-brain-functional-activity-in-heavy-drinking-alcohol-dependent-individuals
#3
M Farokhnia, E N Grodin, M R Lee, E N Oot, A N Blackburn, B L Stangl, M L Schwandt, L A Farinelli, R Momenan, V A Ramchandani, L Leggio
Preclinical evidence suggests that ghrelin, a peptide synthesized by endocrine cells of the stomach and a key component of the gut-brain axis, is involved in alcohol seeking as it modulates both central reward and stress pathways. However, whether and how ghrelin administration may impact alcohol intake in humans is not clear. For, we believe, the first time, this was investigated in the present randomized, crossover, double-blind, placebo-controlled, human laboratory study. Participants were non-treatment-seeking alcohol-dependent heavy-drinking individuals...
November 14, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/29129623/alterations-of-brain-volumes-in-women-with-early-life-maltreatment-and-their-associations-with-oxytocin
#4
Emilia L Mielke, Corinne Neukel, Katja Bertsch, Corinna Reck, Eva Möhler, Sabine C Herpertz
Early life maltreatment (ELM) is associated with different neurobiological alterations. Lower oxytocin and altered grey matter volumes (GMV) in brain regions associated with the central oxytocin system, such as the hypothalamus, amygdala, and nucleus accumbens, have been reported in women with ELM. However, the association between peripheral oxytocin and brain morphometry in women with ELM has not been studied yet. We therefore collected blood samples from 33 women with and 25 women without ELM, all without current mental disorders to measure and compare oxytocin levels between the two groups...
November 9, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/29129597/cocaine-and-desipramine-elicit-distinct-striatal-noradrenergic-and-behavioral-responses-in-selectively-bred-obesity-resistant-and-obesity-prone-rats
#5
Peter J Vollbrecht, Kathryn M Nesbitt, Omar S Mabrouk, Aaron M Chadderdon, Emily M Jutkiewicz, Robert T Kennedy, Carrie R Ferrario
Previous studies have demonstrated a role for norepinephrine (NE) in energy regulation and feeding, and basal differences have been observed in hypothalamic NE systems in obesity-prone vs. obesity-resistant rats. Differences in the function of brain reward circuits, including in the nucleus accumbens (NAc), have been shown in obesity-prone vs. obesity-resistant populations, leading many researchers to explore the role of striatal dopamine in obesity. However, alterations in NE transmission also affect NAc mediated behaviors...
November 9, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/29128164/grey-matter-volume-loss-is-associated-with-specific-clinical-motor-signs-in-huntington-s-disease
#6
Emma M Coppen, Milou Jacobs, Annette A van den Berg-Huysmans, Jeroen van der Grond, Raymund A C Roos
BACKGROUND: Motor disturbances are clinical hallmarks of Huntington's disease (HD) and involve chorea, dystonia, hypokinesia and visuomotor dysfunction. Investigating the association between specific motor signs and different regional volumes is important to understand the heterogeneity of HD. OBJECTIVE: To investigate the motor phenotype of HD and associations with subcortical and cortical grey matter volume loss. METHODS: Structural T1-weighted MRI scans of 79 HD patients and 30 healthy controls were used to calculate volumes of seven subcortical structures including the nucleus accumbens, hippocampus, thalamus, caudate nucleus, putamen, pallidum and amygdala...
November 2, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/29127441/verification-of-a-genetic-locus-for-methamphetamine-intake-and-the-impact-of-morphine
#7
Emily C Eastwood, Amy J Eshleman, Aaron Janowsky, Tamara J Phillips
A quantitative trait locus (QTL) on proximal chromosome (Chr) 10 accounts for > 50% of the genetic variance in methamphetamine (MA) intake in mice selectively bred for high (MAHDR) and low (MALDR) voluntary MA drinking. The µ-opioid receptor (MOP-r) gene, Oprm1, resides at the proximal end of Chr 10, and buprenorphine reduces MA intake in MAHDR mice. However, this drug has only partial agonist effects at MOP-r. We investigated the impact of a full MOP-r agonist, morphine, on MA intake and saccharin intake, measured MOP-r density and affinity in several brain regions of the MA drinking lines and their C57BL/6J (B6) and DBA/2J (D2) progenitor strains, and measured MA intake in two congenic strains of mice to verify the QTL and reduce the QTL interval...
November 10, 2017: Mammalian Genome: Official Journal of the International Mammalian Genome Society
https://www.readbyqxmd.com/read/29126982/effects-of-chronic-social-defeat-on-social-behaviors-in-adult-female-mandarin-voles-microtus-mandarinus-involvement-of-the-oxytocin-system-in-the-nucleus-accumbens
#8
Limin Wang, Wenjuan Hou, Zhixiong He, Wei Yuan, Jinfeng Yang, Yang Yang, Rui Jia, Zhenxiang Zhu, Yue Zhou, Fadao Tai
Chronic social defeat affects many aspects of behavior. Most previous studies have focused on effects on males and defeat during adolescence. The extents to which chronic social defeat can impact female social behavior in adulthood and the neural mechanisms of such effects are poorly understood. Using highly social and aggressive female mandarin voles (Microtus mandarinus), the present study found that chronic social defeat reduced social preference in adult females, and that the defeated voles exhibited a high level of freeze, self-grooming and defensive behavior, as well as reduced exploration, intimacy and aggression during social interactions...
November 7, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29123483/impact-of-vortioxetine-on-synaptic-integration-in-prefrontal-subcortical-circuits-comparisons-with-escitalopram
#9
Shreaya Chakroborty, Thomas R Geisbush, Elena Dale, Alan L Pehrson, Connie Sánchez, Anthony R West
Prefrontal-subcortical circuits support executive functions which often become dysfunctional in psychiatric disorders. Vortioxetine is a multimodal antidepressant that is currently used in the clinic to treat major depressive disorder. Mechanisms of action of vortioxetine include serotonin (5-HT) transporter blockade, 5-HT1A receptor agonism, 5-HT1B receptor partial agonism, and 5-HT1D, 5-HT3, and 5-HT7 receptor antagonism. Vortioxetine facilitates 5-HT transmission in the medial prefrontal cortex (mPFC), however, the impact of this compound on related prefrontal-subcortical circuits is less clear...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29118201/inflow-of-oxygen-and-glucose-into-brain-tissue-induced-by-intravenous-norepinephrine-relationships-with-central-metabolic-and-peripheral-vascular-responses
#10
R Aaron Bola, Eugene A Kiyatkin
As an essential part of sympathetic activation that prepares the organism for "fight or flight," peripheral norepinephrine (NE) plays an important role in regulating cardiac activity and the tone of blood vessels, increasing blood flow to the heart and the brain and decreasing blood flow to the organs not as necessary for immediate survival. To assess whether this effect is applicable to the brain, we used high-speed amperometry to measure the changes in nucleus accumbens (NAc) levels of oxygen and glucose induced by intravenous (iv) injections of NE in awake, freely-moving rats...
November 8, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29118035/single-channel-analysis-of-isoflurane-and-ethanol-enhancement-of-taurine-activated-glycine-receptors
#11
Dean Kirson, Jelena Todorovic, S John Mihic
The amino acid taurine is an endogenous ligand acting on glycine receptors and is released by astrocytes in many brain regions, such as the nucleus accumbens and prefrontal cortex. Taurine is a partial agonist with an efficacy significantly lower than that of glycine. Allosteric modulators such as ethanol and isoflurane produce leftward shifts of glycine concentration-response curves but have no effects at saturating glycine concentrations. In contrast, in whole-cell electrophysiology studies these modulators increase the effects of saturating taurine concentrations...
November 8, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/29117549/prefrontal-cortex-drives-distinct-projection-neurons-in-the-basolateral-amygdala
#12
Laura M McGarry, Adam G Carter
The prefrontal cortex (PFC) regulates emotional behavior via top-down control of the basolateral amygdala (BLA). However, the influence of PFC inputs on the different projection pathways within the BLA remains largely unexplored. Here, we combine whole-cell recordings and optogenetics to study these cell-type specific connections in mouse BLA. We characterize PFC inputs onto three distinct populations of BLA neurons that project to the PFC, ventral hippocampus, or nucleus accumbens. We find that PFC-evoked synaptic responses are strongest at amygdala-cortical and amygdala-hippocampal neurons and much weaker at amygdala-striatal neurons...
November 7, 2017: Cell Reports
https://www.readbyqxmd.com/read/29116427/cart-neurons-in-the-lateral-hypothalamus-communicate-with-the-nucleus-accumbens-shell-via-glutamatergic-neurons-in-paraventricular-thalamic-nucleus-to-modulate-reward-behavior
#13
Amit G Choudhary, Amita R Somalwar, Sneha Sagarkar, Abhishek Rale, Amul Sakharkar, Nishikant K Subhedar, Dadasaheb M Kokare
Paraventricular thalamic nucleus (PVT) serves as a transit node processing food and drug-associated reward information, but its afferents and efferents have not been fully defined. We test the hypothesis that the CART neurons in the lateral hypothalamus (LH) project to the PVT neurons, which in turn communicate via the glutamatergic fibers with the nucleus accumbens shell (AcbSh), the canonical site for reward. Rats conditioned to self-stimulate via an electrode in the right LH-medial forebrain bundle were used...
November 7, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/29114204/acute-ethanol-administration-upregulates-synaptic-%C3%AE-4-subunit-of-neuronal-nicotinic-acetylcholine-receptors-within-the-nucleus-accumbens-and-amygdala
#14
Josephine R Tarren, Henry A Lester, Arnauld Belmer, Selena E Bartlett
Alcohol and nicotine are two of the most frequently abused drugs, with their comorbidity well described. Previous data show that chronic exposure to nicotine upregulates high-affinity nicotinic acetylcholine receptors (nAChRs) in several brain areas. Effects of ethanol on specific brain nAChR subtypes within the mesolimbic dopaminergic (DA) pathway may be a key element in the comorbidity of ethanol and nicotine. However, it is unknown how alcohol affects the abundance of these receptor proteins. In the present study, we measured the effect of acute binge ethanol on nAChR α4 subunit levels in the prefrontal cortex (PFC), nucleus accumbens (NAc), ventral tegmental area (VTA), and amygdala (Amg) by western blot analysis using a knock-in mouse line, generated with a normally functioning α4 nAChR subunit tagged with yellow fluorescent protein (YFP)...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/29110820/rapid-cocaine-induced-spine-changes-in-the-nucleus-accumbens
#15
Rajtarun Madangopal
No abstract text is available yet for this article.
December 1, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/29109977/prior-alcohol-use-enhances-vulnerability-to-compulsive-cocaine-self-administration-by-promoting-degradation-of-hdac4-and-hdac5
#16
Edmund A Griffin, Philippe A Melas, Royce Zhou, Yang Li, Peter Mercado, Kimberly A Kempadoo, Stacy Stephenson, Luca Colnaghi, Kathleen Taylor, Mei-Chen Hu, Eric R Kandel, Denise B Kandel
Addiction to cocaine is commonly preceded by experiences with legal or decriminalized drugs, such as alcohol, nicotine, and marijuana. The biological mechanisms by which these gateway drugs contribute to cocaine addiction are only beginning to be understood. We report that in the rat, prior alcohol consumption results in enhanced addiction-like behavior to cocaine, including continued cocaine use despite aversive consequences. Conversely, prior cocaine use has no effect on alcohol preference. Long-term, but not short-term, alcohol consumption promotes proteasome-mediated degradation of the nuclear histone deacetylases HDAC4 and HDAC5 in the nucleus accumbens, a brain region critical for reward-based memory...
November 2017: Science Advances
https://www.readbyqxmd.com/read/29109060/cannabinoid-1-receptor-neutral-antagonist-reduces-binge-like-alcohol-consumption-and-alcohol-induced-accumbal-dopaminergic-signaling
#17
Andrea Balla, Bin Dong, Borehalli M Shilpa, Kiran Vemuri, Alexandros Makriyannis, Subhash C Pandey, Henry Sershen, Raymond F Suckow, K Yaragudri Vinod
Binge alcohol (ethanol) drinking is associated with profound adverse effects on our health and society. Rimonabant (SR141716A), a CB1 receptor inverse agonist, was previously shown to be effective for nicotine cessation and obesity. However, studies using rimonabant were discontinued as it was associated with an increased risk of depression and anxiety. In the present study, we examined the pharmacokinetics and effects of AM4113, a novel CB1 receptor neutral antagonist on binge-like ethanol drinking in C57BL/6J mice using a two-bottle choice drinking-in-dark (DID) paradigm...
November 3, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/29107702/intra-nasal-dopamine-alleviates-cognitive-deficits-in-tgdisc1-rats-which-overexpress-the-human-disc1-gene
#18
An-Li Wang, Benedetta Fazari, Owen Y Chao, Susanne Nikolaus, Svenja V Trossbach, Carsten Korth, Fernando J Sialana, Gert Lubec, Joseph P Huston, Claudia Mattern, Maria Angelica de Souza Silva
The Disrupted-in-Schizophrenia 1 (DISC1) gene has been associated with mental illnesses such as major depression and schizophrenia. The transgenic DISC1 (tgDISC1) rat, which overexpresses the human DISC1 gene, is known to exhibit deficient dopamine (DA) homeostasis. To ascertain whether the DISC1 gene also impacts cognitive functions, 14-15 months old male tgDISC1 rats and wild-type controls were subjected to the novel object preference (NOP) test and the object-based attention test (OBAT) in order to assess short-term memory (1 h), long-term memory (24 h), and attention...
October 28, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29105886/altered-structure-and-functional-connection-in-patients-with-classical-trigeminal-neuralgia
#19
Yuan-Hsiung Tsai, Rui Yuan, Dharni Patel, Subhashini Chandrasekaran, Hsu-Huei Weng, Jen-Tsung Yang, Ching-Po Lin, Bharat B Biswal
Classical trigeminal neuralgia (TN) is a specific type of neuropathic orofacial pain of which the plasticity of brain structure and connectivity have remained largely unknown. A total of 62 TN patients were included and referred to MRI scans. Voxel-based morphometry was used to analyze the change of gray matter volume. Resting-state functional imaging was used to analyze the connectivity between brain regions. The results showed gray matter volume reduction in components of the prefrontal cortex, precentral gyrus, cerebellar tonsil, thalamus, hypothalamus, and nucleus accumbens among right TN patient and in the inferior frontal gyrus, precentral gyrus, cerebellum, thalamus, ventral striatum, and putamen among left TN patients...
November 6, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29103813/corrigendum-to-trpv1-modulates-morphine-induced-conditioned-place-preference-via-p38-mapk-in-the-nucleus-accumbens-behav-brain-res-334-2017-26-33
#20
Sa-Ik Hong, Thi-Lien Nguyen, Shi-Xun Ma, Hyoung-Chun Kim, Seok-Yong Lee, Choon-Gon Jang
No abstract text is available yet for this article.
November 2, 2017: Behavioural Brain Research
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