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Lateral hypothalamus

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https://www.readbyqxmd.com/read/29689132/alcohol-delays-the-onset-of-puberty-in-the-female-rat-by-altering-key-hypothalamic-events
#1
Vinod K Srivastava, Jill K Hiney, William L Dees
BACKGROUND: Because alcohol (ALC) delays signs of pubertal development, we assessed the time course of events associated with the synthesis of critical hypothalamic peptides that regulate secretion of luteinizing hormone-releasing hormone (LHRH), the peptide that drives the pubertal process. METHODS: Immature female rats were administered either lab chow or Bio-Serve isocaloric control or ALC liquid diets from 27 through 33 days of age. On days 28, 29, 31 and 33 animals were killed by decapitation and tissue blocks containing the medial basal hypothalamus (MBH) and the rostral hypothalamic area (RHA) were isolated and stored frozen until assessed by Western blot analysis...
April 24, 2018: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/29686649/a-free-choice-high-fat-high-sugar-diet-alters-day-night-per2-gene-expression-in-reward-related-brain-areas-in-rats
#2
Aurea Susana Blancas-Velazquez, Unga A Unmehopa, Leslie Eggels, Laura Koekkoek, Andries Kalsbeek, Jorge Mendoza, Susanne E la Fleur
Under normal light-dark conditions, nocturnal rodents consume most of their food during the dark period. Diets high in fat and sugar, however, may affect the day-night feeding rhythm resulting in a higher light phase intake. In vitro and in vivo studies showed that nutrients affect clock-gene expression. We therefore hypothesized that overconsuming fat and sugar alters clock-gene expression in brain structures important for feeding behavior. We determined the effects of a free-choice high-fat high-sugar (fcHFHS) diet on clock-gene expression in rat brain areas related to feeding and reward and compared them with chow-fed rats...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29680268/distribution-of-mch-containing-fibers-in-the-feline-brainstem-relevance-for-rem-sleep-regulation
#3
Alicia Costa, Santiago Castro-Zaballa, Patricia Lagos, Michael H Chase, Pablo Torterolo
Neurons that utilize melanin-concentrating hormone (MCH) as a neuromodulator are localized in the postero-lateral hypothalamus and incerto-hypothalamic area. These neurons project diffusely throughout the central nervous system and have been implicated in critical physiological processes, such as sleep. Unlike rodents, in the order carnivora as well as in humans, MCH exerts its biological functions through two receptors: MCHR-1 and MCHR-2. Hence, the cat is an optimal animal to model MCHergic functions in humans...
April 19, 2018: Peptides
https://www.readbyqxmd.com/read/29679559/foxd1-is-required-for-terminal-differentiation-of-anterior-hypothalamic-neuronal-subtypes
#4
Elizabeth A Newman, Dong Won Kim, Jun Wan, Jie Wang, Jiang Qian, Seth Blackshaw
Although the hypothalamus functions as a master homeostat for many behaviors, little is known about the transcriptional networks that control its development. To investigate this question, we analyzed mice deficient for the Forkhead domain transcription factor Foxd1. Foxd1 is selectively expressed in neuroepithelial cells of the prethalamus and hypothalamus prior to the onset of neurogenesis, and is later restricted to neural progenitors of the prethalamus and anterior hypothalamus. During early stages of neurogenesis, we observed that Foxd1-deficient mice showed reduced expression of Six3 and Vax1 in anterior hypothalamus, but overall patterning of the prethalamus and hypothalamus is unaffected...
April 18, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29679009/nucleus-accumbens-controls-wakefulness-by-a-subpopulation-of-neurons-expressing-dopamine-d-1-receptors
#5
Yan-Jia Luo, Ya-Dong Li, Lu Wang, Su-Rong Yang, Xiang-Shan Yuan, Juan Wang, Yoan Cherasse, Michael Lazarus, Jiang-Fan Chen, Wei-Min Qu, Zhi-Li Huang
Nucleus accumbens (NAc) is involved in behaviors that depend on heightened wakefulness, but its impact on arousal remains unclear. Here, we demonstrate that NAc dopamine D1 receptor (D1 R)-expressing neurons are essential for behavioral arousal. Using in vivo fiber photometry in mice, we find arousal-dependent increases in population activity of NAc D1 R neurons. Optogenetic activation of NAc D1 R neurons induces immediate transitions from non-rapid eye movement sleep to wakefulness, and chemogenetic stimulation prolongs arousal, with decreased food intake...
April 20, 2018: Nature Communications
https://www.readbyqxmd.com/read/29663134/profound-seasonal-changes-in-brain-size-and-architecture-in-the-common-shrew
#6
Javier Lázaro, Moritz Hertel, Chet C Sherwood, Marion Muturi, Dina K N Dechmann
The seasonal changes in brain size of some shrews represent the most drastic reversible transformation in the mammalian central nervous system known to date. Brain mass decreases 10-26% from summer to winter and regrows 9-16% in spring, but the underlying structural changes at the cellular level are not yet understood. Here, we describe the volumetric differences in brain structures between seasons and sexes of the common shrew (Sorex araneus) in detail, confirming that changes in different brain regions vary in the magnitude of change...
April 16, 2018: Brain Structure & Function
https://www.readbyqxmd.com/read/29662440/electrophysiological-properties-of-melanin-concentrating-hormone-and-orexin-neurons-in-adolescent-rats
#7
Victoria Linehan, Michiru Hirasawa
Orexin and melanin-concentrating hormone (MCH) neurons have complementary roles in various physiological functions including energy balance and the sleep/wake cycle. in vitro electrophysiological studies investigating these cells typically use post-weaning rodents, corresponding to adolescence. However, it is unclear whether these neurons are functionally mature at this period and whether these studies can be generalized to adult cells. Therefore, we examined the electrophysiological properties of orexin and MCH neurons in brain slices from post-weaning rats and found that MCH neurons undergo an age-dependent reduction in excitability, but not orexin neurons...
2018: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29656870/distinct-accumbens-shell-output-pathways-promote-versus-prevent-relapse-to-alcohol-seeking
#8
Gabrielle D Gibson, Asheeta A Prasad, Philip Jean-Richard-Dit-Bressel, Joanna O Y Yau, E Zayra Millan, Yu Liu, Erin J Campbell, Jun Lim, Nathan J Marchant, John M Power, Simon Killcross, Andrew J Lawrence, Gavan P McNally
Contexts exert bi-directional control over relapse to drug seeking. Contexts associated with drug self-administration promote relapse, whereas contexts associated with the absence of self-administration protect against relapse. The nucleus accumbens shell (AcbSh) is a key brain region determining these roles of context. However, the specific cell types, and projections, by which AcbSh serves these dual roles are unknown. Here, we show that contextual control over relapse and abstinence is embedded within distinct output circuits of dopamine 1 receptor (Drd1) expressing AcbSh neurons...
April 6, 2018: Neuron
https://www.readbyqxmd.com/read/29653128/serotonin-specific-lesions-of-the-dorsal-raphe-disrupt-maternal-aggression-and-caregiving-in-postpartum-rats
#9
M Allie Holschbach, Erika V Vitale, Joseph S Lonstein
The behavioral modifications associated with early motherhood, including high aggression, caring for young, and low anxiety are all affected by acute pharmacological manipulation of serotonin signaling. However, the effects on these behaviors of permanently disrupting serotonin signaling at one of its primary sources, the dorsal raphe (DR), have not been examined in detail. To address this, serotonin-specific lesions centered on the dorsomedial DR (DRdm; subregion most implicated in emotional behaviors) were induced at mid-pregnancy (day 15) or early postpartum (day 2) in rats using a saporin-conjugated neurotoxin targeting the serotonin transporter (Anti-SERT-SAP)...
April 10, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29643838/identification-of-transmembrane-protease-serine-2-and-forkhead-box-a1-as-the-potential-bisphenol-a-responsive-genes-in-the-neonatal-male-rat-brain
#10
Takayoshi Ubuka, Shogo Moriya, Tomoko Soga, Ishwar Parhar
Perinatal exposure of Bisphenol A (BPA) to rodents modifies their behavior in later life. To understand how BPA modifies their neurodevelopmental process, we first searched for BPA responsive genes from androgen and estrogen receptor signaling target genes by polymerase chain reaction array in the neonatal male rat brain. We used a transgenic strain of Wistar rats carrying enhanced green fluorescent protein tagged to gonadotropin-inhibitory hormone (GnIH) promoter to investigate the possible interaction of BPA responsive genes and GnIH neurons...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29625116/neuropeptide-y-npy-or-cocaine-and-amphetamine-regulated-transcript-cart-fiber-innervation-on-central-and-medial-amygdaloid-neurons-that-project-to-the-locus-coeruleus-and-dorsal-raphe-in-the-rat
#11
Young G Hwang, Hyun S Lee
The amygdaloid nuclear complex has been linked to the regulation of emotional behavior and energy regulation in that emotional stress might cause either reduction or enhancement of eating. We examined hypothalamic neuronal origin of feeding/arousal-related peptidergic fibers containing cocaine- and amphetamine-regulated transcript (CART) and neuropeptide Y (NPY) located in the rat amygdala along with its efferent projections to the brainstem monoaminergic nuclei. First, central (CeA) as well as medial (MeA) amygdala, among several amygdaloid subdivisions, exhibited the most prominent NPY or CART immunostaining which consisted of a substantial number of somata as well as labeled fibers...
April 3, 2018: Brain Research
https://www.readbyqxmd.com/read/29625019/beta-hydroxybutyrate-infusion-identifies-acute-differentially-expressed-genes-related-to-metabolism-and-reproduction-in-the-hypothalamus-and-pituitary-of-sheep
#12
Emily R Cope, Brynn H Voy, Brian K Whitlock, Meg Staton, Thomas Lane, Jack Davitt, J Travis Mulliniks
To identify molecular pathways of metabolic imbalances and reproduction, 10 castrated male sheep were randomly assigned to be injected into the lateral ventricle through intracerebroventricular cannulas with 1 mL of β-hydroxybutyric acid sodium salt solution (BHB; 12,800 µmol/L) or saline solution (CON; 0.9% NaCl). Approximately two hours post injection, sheep were humanely euthanized, and hypothalamus and pituitary tissues were harvested for transcriptome characterization using RNA-sequencing. Ribonucleic acid (RNA) was extracted from the hypothalamus and pituitary and sequenced at a high depth (Hypothalamus: 468,912,732 reads; Pituitary: 515,106,092 reads) using the Illumina Hi-Seq 2500 platform and aligned to Bos taurus and Ovis aries genomes...
April 6, 2018: Physiological Genomics
https://www.readbyqxmd.com/read/29622845/a-newly-defined-area-of-the-mouse-anterior-hypothalamus-involved-in-septohypothalamic-circuit-perifornical-area-of-the-anterior-hypothalamus-pefah
#13
Noriko Horii-Hayashi, Mayumi Nishi
Although the hypothalamus is classified into more than 10 compartments, it still contains uncharacterized areas. In this study, we identified a new triangular-shaped area between the paraventricular hypothalamic nucleus (PVN) and the fornix area in the mouse anterior hypothalamus, which is enriched in chondroitin sulfate proteoglycans (CSPGs). We designated this region as the perifornical area of the anterior hypothalamus (PeFAH) based on its anatomical location. As evidenced by Nissl staining, the PeFAH was distinguishable as an area of relatively low density...
February 27, 2018: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/29615977/overview-of-the-pathophysiological-implications-of-organotins-on-the-endocrine-system
#14
REVIEW
Vinicius Bermond Marques, Rodrigo Alves Faria, Leonardo Dos Santos
Organotins (OTs) are pollutants that are used widely by industry as disinfectants, pesticides, and most frequently as biocides in antifouling paints. This mini-review presents the main evidences from the literature about morphophysiological changes induced by OTs in the mammal endocrine system, focusing on the metabolism and reproductive control. Similar to other toxic compounds, the main effects with potential health risks to humans and experimental animals are not only related to dose and time of exposure but also to age, gender, and tissue/cell exposed...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29615872/projections-of-the-diencephalospinal-dopaminergic-system-to-peripheral-sense-organs-in-larval-zebrafish-danio-rerio
#15
Melanie Haehnel-Taguchi, António M Fernandes, Margit Böhler, Ina Schmitt, Lena Tittel, Wolfgang Driever
Dopaminergic neurons of the descending diencephalospinal system are located in the posterior tuberculum (PT) in zebrafish ( Danio rerio ), and correspond in mammals to the A11 group in hypothalamus and thalamus. In the larval zebrafish, they are likely the only source of central dopaminergic projections to the periphery. Here, we characterized posterior tubercular dopaminergic fibers projecting to peripheral sense organs, with a focus on the lateral line neuromasts. We labeled and identified catecholaminergic neurons and their projections by combining two immunofluorescence techniques, (i) using an antibody against Tyrosine hydroxylase, and (ii) using an antibody against GFP in transgenic zebrafish expressing in catecholaminergic neurons either membrane-anchored GFP to track fibers, or a Synaptophysin-GFP fusion to visualize putative synapses...
2018: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/29609112/hair-cortisol-concentration-hcc-as-a-measure-for-prenatal-psychological-distress-a-systematic-review
#16
REVIEW
Paula Mustonen, Linnea Karlsson, Noora M Scheinin, Susanna Kortesluoma, Bárbara Coimbra, Ana João Rodrigues, Hasse Karlsson
Prenatal environment reportedly affects the programming of developmental trajectories in offspring and the modification of risks for later morbidity. Among the increasingly studied prenatal exposures are maternal psychological distress (PD) and altered maternal hypothalamus-pituitary-adrenal (HPA) axis functioning. Both prenatal PD and maternal short-term cortisol concentrations as markers for HPA axis activity have been linked to adverse child outcomes and it has been assumed that maternal PD affects the offspring partially via altered cortisol secretion patterns...
March 27, 2018: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/29593510/chronic-stress-alters-behavior-in-the-forced-swim-test-and-underlying-neural-activity-in-animals-exposed-to-alcohol-prenatally-sex-and-time-dependent-effects
#17
Vivian Y Y Lam, Charlis Raineki, Lily E Takeuchi, Linda Ellis, Todd S Woodward, Joanne Weinberg
Dysregulation of the hypothalamic-pituitary-adrenal (HPA) stress response has been suggested to play a role in vulnerability to stress-related disorders, such as depression. Prenatal alcohol exposure (PAE) may result in HPA dysregulation, which in turn may predispose individuals to the effects of stress exposure throughout life, and increase their risk of developing depression compared to unexposed individuals. We examined the immediate and delayed effects of chronic unpredictable stress (CUS) in adulthood on behavior of PAE animals in the forced swim test (FST) and the neurocircuitry underlying behavioral, emotional, and stress regulation...
2018: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29580892/cocaine-and-amphetamine-regulated-transcript-peptide-cart-induced-reward-behavior-is-mediated-via-g-i-o-dependent-phosphorylation-of-pka-erk-creb-pathway
#18
Amita R Somalwar, Amit G Choudhary, Pravesh R Sharma, Nagalakshmi B, Sneha Sagarkar, Amul J Sakharkar, Nishikant K Subhedar, Dadasaheb M Kokare
Although the role of cocaine- and amphetamine-regulated transcript peptide (CART) in modulating the mesolimbic reward pathway has been suggested, underlying cellular mechanisms have not been elucidated. Herein, we investigate the involvement of Gi/o dependent protein kinase A (PKA)/extracellular signal-regulated kinase (ERK)/cAMP response element binding protein (CREB) signaling in CART induced reward behavior. The rat was implanted with a stimulating electrode targeted at the lateral hypothalamus (LH)-medial forebrain bundle (MFB) and conditioned to intracranial self-stimulation (ICSS) in an operant chamber...
March 23, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29577327/gamma-and-infra-slow-oscillations-shape-neuronal-firing-in-the-rat-subcortical-visual-system
#19
Lukasz Chrobok, Katarzyna Palus-Chramiec, Jagoda Stanislawa Jeczmien-Lazur, Tomasz Blasiak, Marian Henryk Lewandowski
Physiological function of rhythmic firing in the neuronal networks of sensory systems has been linked with information coding. Also, neuronal oscillations in different frequency bands often change as a signature of brain state or sensory processing. Infra-slow oscillation (ISO) in the neuronal firing dependent on the retinal network has been previously described in the structures of the subcortical visual system. In this paper, we show for the first time that firing of ISO neurons in the lateral geniculate nucleus is also characterised by a harmonic discharge pattern, i...
March 25, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29557373/wake-promoting-effects-of-vagus-nerve-stimulation-after-traumatic-brain-injury-upregulation-of-orexin-a-and-orexin-receptor-type-1-expression-in-the-prefrontal-cortex
#20
Xiao-Yang Dong, Zhen Feng
Orexins, produced in the lateral hypothalamus, are important neuropeptides that participate in the sleep/wake cycle, and their expression coincides with the projection area of the vagus nerve in the brain. Vagus nerve stimulation has been shown to decrease the amounts of daytime sleep and rapid eye movement in epilepsy patients with traumatic brain injury. In the present study, we investigated whether vagus nerve stimulation promotes wakefulness and affects orexin expression. A rat model of traumatic brain injury was established using the free fall drop method...
February 2018: Neural Regeneration Research
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