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https://www.readbyqxmd.com/read/28546314/chronic-stress-induced-behavioral-changes-associated-with-subregion-selective-serotonin-cell-death-in-the-dorsal-raphe
#1
Reka Natarajan, Laura Forrester, Nicolas Chiaia, Bryan K Yamamoto
The current study examined the neurochemical mechanisms and neuroanatomical changes underlying co-existing behavioral effects associated with chronic stress-induced alterations in serotonin (5HT) neurons. Chronic unpredictable stress (CUS) to adult male rats produced depression-like changes with cognitive dysfunction and selective cell death in the interfascicular nucleus of the dorsal raphe (DRif) resulting in decreased 5HTergic innervation of medial prefrontal cortex (mPFC). Twenty-one days of CUS decreased basal plasma levels of corticosterone and produced a shorter latency to immobility and longer durations of immobility in the force-swim test that persisted for one month after CUS...
May 25, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28546308/dentate-gyrus-contributes-to-retrieval-as-well-as-encoding-evidence-from-context-fear-conditioning-recall-and-extinction
#2
Brian E Bernier, Anthony F Lacagnina, Adam Ayoub, Francis Shue, Boris V Zemelman, Franklin B Krasne, Michael R Drew
Dentate gyrus (DG) is widely thought to provide a teaching signal that enables hippocampal encoding of memories, but its role during retrieval is poorly understood. Some data and models suggest that DG plays no role in retrieval; others encourage the opposite conclusion. To resolve this controversy, we evaluated the effects of optogenetic inhibition of dorsal DG during context fear conditioning, recall, generalization, and extinction in male mice. We found that (1) inhibition during training impaired context fear acquisition; (2) inhibition during recall did not impair fear expression in the training context, unless mice had to distinguish between similar feared and neutral contexts; (3) inhibition increased generalization of fear to an unfamiliar context that was similar to a feared one and impaired fear expression in the conditioned context when it was similar to a neutral one; (4) inhibition impaired fear extinction...
May 25, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28545545/a-focused-ethnography-of-a-child-and-adolescent-mental-health-service-factors-relevant-to-the-implementation-of-a-depression-trial
#3
C E W Kitchen, S Lewis, P A Tiffin, P R Welsh, L Howey, D Ekers
BACKGROUND: Prior to commencing a randomised controlled trial, we conducted a focused ethnography to ensure that the trial was well suited to the proposed setting. METHODS: A six-month observation of a Child and Adolescent Mental Health Service site in the North-East of England was undertaken to observe the site procedures, staff culture and patient care pathways. During this period, documentary data were collected and interviews were conducted with key informants to provide insight into staff perceptions of the proposed trial...
May 25, 2017: Trials
https://www.readbyqxmd.com/read/28534643/bicams-in-the-argentine-population-relationship-with-clinical-and-sociodemographic-variables
#4
Sandra Vanotti, A Smerbeck, María B Eizaguirre, Maria L Saladino, Ralph R H Benedict, Fernando J Caceres
The Brief International Cognitive Assessment for Multiple Sclerosis (BICAMS) was developed to provide valid assessment of cognitive impairment in multiple sclerosis (MS). The relationship between clinical and social variables and cognitive disorders has been extensively studied, but primarily in developed countries with a focus on other cognitive measures or batteries. The objectives of this study were to analyze the relationship between the BICAMS data and key clinical and sociodemographic variables in the Argentine MS population...
May 23, 2017: Applied Neuropsychology. Adult
https://www.readbyqxmd.com/read/28533940/dietary-factors-and-cognitive-function-in-poor-urban-settings
#5
Regina S Wright, Constance Gerassimakis, Desirée Bygrave, Shari R Waldstein
A significant body of evidence suggests that poor dietary intake is associated with reduced cognitive function. However, few studies have examined this relation in poor urban settings. Our brief review suggests that (a) higher overall diet quality may play a particularly important role in cognitive function among the poorest; and (b) greater vitamin E intake is related to better cognitive performance, at least in part, via fewer depressive symptoms. The broader recent literature strongly suggests the beneficial role of diet for learning and memory, and potentially synergistic influences on other cognitive domains...
March 2017: Current Nutrition Reports
https://www.readbyqxmd.com/read/28533517/vortioxetine-reduces-bold-signal-during-performance-of-the-n-back-working-memory-task-a-randomised-neuroimaging-trial-in-remitted-depressed-patients-and-healthy-controls
#6
J Smith, M Browning, S Conen, R Smallman, J Buchbjerg, K G Larsen, C K Olsen, S R Christensen, G R Dawson, J F Deakin, P Hawkins, R Morris, G Goodwin, C J Harmer
Cognitive dysfunction is common in depression during both acute episodes and remission. Vortioxetine is a novel multimodal antidepressant that has improved cognitive function including executive function in depressed patients in randomised placebo-controlled clinical trials. However, it is unclear whether vortioxetine is able to target directly the neural circuitry implicated in the cognitive deficits in depression. Remitted depressed (n=48) and healthy volunteers (n=48) were randomised to receive 14 days treatment with 20 mg vortioxetine or placebo in a double-blind design...
May 23, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28532277/temporal-parameters-of-post-stress-prophylactic-glucose-treatment-in-rats
#7
M A Conoscenti, E E Hart, N J Smith, T R Minor
Acute trauma can lead to life-long changes in susceptibility to psychiatric disease, such as Post-Traumatic Stress Disorder (PTSD). Rats given free access to a concentrated glucose solution for 24 hours beginning immediately after trauma failed to show stress-related pathology in the learned helplessness model of PTSD and comorbid major depression. We assessed effective dosing and temporal constraints of the glucose intervention in three experiments. We exposed 120 male Sprague-Dawley rats to 100, 1 mA, 3-15s, inescapable and unpredictable electric tail shocks (over a 110 minute period) or simple restraint in the learned helplessness procedure...
May 22, 2017: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/28527907/behavioral-and-cognitive-impact-of-early-life-stress-insights-from-an-animal-model
#8
Hesong Liu, Fatin Atrooz, Ankita Salvi, Samina Salim
BACKGROUND: Children subjected to traumatic events during childhood are reported to exhibit behavioral and cognitive deficits later in life, often leading to post-traumatic stress disorder (PTSD) and major depression. Interestingly, some children continue to remain normal despite being exposed to the same risk factors. These trauma-related behavioral and cognitive profiles across different stages of life are not well understood. Animal studies can offer useful insights. OBJECTIVE: The goal of this study was to determine the impact of early life exposure to traumatic events on behavioral and cognitive profile in rats by tracking the behavior of each rat at different ages...
May 17, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28526411/jnj10181457-a-histamine-h3-receptor-inverse-agonist-regulates-in-vivo-microglial-functions-and-improves-depression-like-behaviours-in-mice
#9
Tomomitsu Iida, Takeo Yoshikawa, Anikó Kárpáti, Takuro Matsuzawa, Haruna Kitano, Asuka Mogi, Ryuichi Harada, Fumito Naganuma, Tadaho Nakamura, Kazuhiko Yanai
Brain histamine acts as a neurotransmitter and regulates various physiological functions, such as learning and memory, sleep-wake cycles, and appetite regulation. We have recently shown that histamine H3 receptor (H3R) is expressed in primary mouse microglia and has a strong influence on critical functions in microglia, including chemotaxis, phagocytosis, and cytokine secretion in vitro. However, the importance of H3R in microglial activity in vivo remains unknown. Here, we examined the effects of JNJ10181457 (JNJ), a selective and potent H3R inverse agonist, on microglial functions ex vivo and in vivo...
May 16, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28526399/evaluation-of-the-effectiveness-of-chronic-antidepressant-drug-treatments-in-the-hippocampal-mitochondria-a-proteomic-study-in-an-animal-model-of-depression
#10
Katarzyna Głombik, Aneta Stachowicz, Ewa Trojan, Rafał Olszanecki, Joanna Ślusarczyk, Maciej Suski, Katarzyna Chamera, Bogusława Budziszewska, Władysław Lasoń, Agnieszka Basta-Kaim
Several lines of evidence indicate that adverse experience in early life may be a triggering factor for disturbances in the brain mitochondrial proteins and lead to the development of depression in adulthood. On the other hand, little is known about the impact of chronic administration of various antidepressant drugs on the brain mitochondria, as a target for the pharmacotherapy of depression. The purpose of our study was to compare the impact of chronic treatment with two antidepressant drugs with different mechanisms of action, a tricyclic antidepressant (TCA), imipramine, and an antidepressant of the selective serotonin reuptake inhibitor (SSRI) class, fluoxetine, on the mitochondria-enriched subproteome profile in the hippocampus of 3-month-old male rats following a prenatal stress procedure (an animal model of depression)...
May 16, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28525797/to-neglect-or-integrate-contingency-information-from-outside-the-task-frame-that-is-the-question-effects-of-depressed-mood
#11
R M Msetfi, N Byrom, R A Murphy
Evidence shows that there are individual differences in the extent to which people attend to and integrate information into their decisions about the predictive contingencies between events and outcomes. In particular, information about the absence of events or outcomes, presented outside the current task frame, is often neglected. This trend is particularly evident in depression, as well as other psychopathologies, though reasons for information neglect remain unclear. We investigated this phenomenon across two experiments (Experiment 1: N=157; Experiment 2: N=150) in which participants, scoring low and high in the Beck Depression Inventory, were asked to learn a simple predictive relationship between a visual cue and an auditory outcome...
May 16, 2017: Acta Psychologica
https://www.readbyqxmd.com/read/28521266/neural-mechanisms-of-reward-processing-associated-with-depression-related-personality-traits
#12
Akina Umemoto, Clay B Holroyd
OBJECTIVE: Although impaired reward processing in depression has been well-documented, the exact nature of that deficit remains poorly understood. To investigate the link between depression and the neural mechanisms of reward processing, we examined individual differences in personality. METHODS: We recorded the electroencephalogram from healthy college students engaged in a probabilistic reinforcement learning task. Participants also completed several personality questionnaires that assessed traits related to reward sensitivity, motivation, and depression...
April 21, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28520937/atypical-endocannabinoid-signaling-initiates-a-new-form-of-memory-related-plasticity-at-a-cortical-input-to-hippocampus
#13
Weisheng Wang, Yousheng Jia, Danielle T Pham, Linda C Palmer, Kwang-Mook Jung, Conor D Cox, Gavin Rumbaugh, Daniele Piomelli, Christine M Gall, Gary Lynch
Endocannabinoids (ECBs) depress transmitter release at sites throughout the brain. Here, we describe another form of ECB signaling that triggers a novel form of long-term potentiation (LTP) localized to the lateral perforant path (LPP) which conveys semantic information from cortex to hippocampus. Two cannabinoid CB1 receptor (CB1R) signaling cascades were identified in hippocampus. The first is pregnenolone sensitive, targets vesicular protein Munc18-1 and depresses transmitter release; this cascade is engaged by CB1Rs in Schaffer-Commissural afferents to CA1 but not in the LPP, and it does not contribute to LTP...
May 17, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28513073/early-neurocognitive-improvements-following-parathyroidectomy-for-primary-hyperparathyroidism
#14
Shivani Shah-Becker, Jonathan Derr, Benjamin S Oberman, Aaron Baker, Brian Saunders, Michele M Carr, David Goldenberg
OBJECTIVES: To establish a time frame for postoperative improvements in neurocognitive function in patients who undergo parathyroidectomy for primary hyperparathyroidism by utilizing repeat neuropsychological assessment at multiple time points before and after surgery. STUDY DESIGN: Prospective cohort study. METHODS: A prospective study was conducted at a tertiary academic medical center between August 2014 and December 2015, including 50 patients with primary hyperparathyroidism who underwent parathyroidectomy...
May 16, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28506437/association-between-interleukin-6-and-striatal-prediction-error-signals-following-acute-stress-in-healthy-female-participants
#15
Michael T Treadway, Roee Admon, Amanda R Arulpragasam, Malavika Mehta, Samuel Douglas, Gordana Vitaliano, David P Olson, Jessica A Cooper, Diego A Pizzagalli
BACKGROUND: Stress is widely known to alter behavioral responses to rewards and punishments. It is believed that stress may precipitate these changes through modulation of corticostriatal circuitry involved in reinforcement learning and motivation, although the intervening mechanisms remain unclear. One candidate is inflammation, which can rapidly increase following stress and can disrupt dopamine-dependent reward pathways. METHODS: Here, in a sample of 88 healthy female participants, we first assessed the effect of an acute laboratory stress paradigm on levels of plasma interleukin-6 (IL-6), a cytokine known to be both responsive to stress and elevated in depression...
March 28, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28502691/long-term-seizure-quality-of-life-depression-and-verbal-memory-outcomes-in-a-controlled-mesial-temporal-lobe-epilepsy-surgical-series-using-portuguese-validated-instruments
#16
Luis Dias, Geisa Angelis, Wagner Teixeira, Luiz Casulari
OBJECTIVE: We aimed to evaluate long-term surgical outcomes in patients treated for mesial temporal lobe epilepsy (MTLE) compared to a similar group of patients that underwent a preoperative evaluation. METHODS: Patient interviews were conducted by an independent neuropsychologist and included a socio-demographic questionnaire and validated versions of the Beck Depression Inventory-II (BDI-II), Adverse Events Profile (AEP), Quality of Life in Epilepsy-31 (QOLIE-31), and Rey Auditory Verbal Learning Test (RAVLT)...
May 11, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28501772/hyperoside-protects-against-chronic-mild-stress-induced-learning-and-memory-deficits
#17
Yeli Gong, Youhua Yang, Xiaoqing Chen, Min Yang, Dan Huang, Rong Yang, Lianying Zhou, Changlei Li, Qiuju Xiong, Zhe Xiong
Hyperoside (quercetin-3-O-b-d-galactosidepyranose) is a plant-derived flavonoid mainly found in fruits, fruit juices (most notably flavanols, flavanones, and anthocyanins) and Chinese traditional medicines. It has been applied to relieve pain and improve cardiovascular functions in clinic. However, the effects of hyperoside on cognitive impairment induced by chronic stress and the underlying molecular mechanisms remain unclear. In the current study, we used chronic mild stress (CMS) rats to investigate the effects of hyperoside on learning and memory and further explore the possible mechanisms...
May 11, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28501325/a-role-for-nmdar-dependent-cerebellar-plasticity-in-adaptive-control-of-saccades-in-humans
#18
S Colnaghi, P Colagiorgio, M Versino, G Koch, E D'Angelo, S Ramat
BACKGROUND: Saccade pulse amplitude adaptation is mediated by the dorsal cerebellar vermis and fastigial nucleus. Long-term depression at the parallel fibre-Purkinjie cell synapses has been suggested to provide a cellular mechanism for the corresponding learning process. The mechanisms and sites of this plasticity, however, are still debated. OBJECTIVE: To test the role of cerebellar plasticity phenomena on adaptive saccade control. METHODS: We evaluated the effect of continuous theta burst stimulation (cTBS) over the posterior vermis on saccade amplitude adaptation and spontaneous recovery of the initial response...
May 5, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28499915/early-life-stress-and-later-peer-distress-on-depressive-behavior-in-adolescent-female-rats-effects-of-a-novel-intervention-on-gaba-and-d2-receptors
#19
Jodi L Lukkes, Shirisha Meda, Britta S Thompson, Nadja Freund, Susan L Andersen
Early life adversity (ELA) increases the risk of depression during adolescence that may result from a decline in parvalbumin (PVB) secondary to increased neuroinflammation. In this study, we investigated depressive-like behavior following exposure to two different types of stressors that are relevant for their developmental period: 1) chronic ELA (maternal separation; MS) and 2) an acute emotional stressor during adolescence (witnessing their peers receive multiple shocks; WIT), and their interaction. We also determined whether reducing inflammation by cyclooxygenase-2 (COX-2) inhibition would prevent the onset of depressive-like behavior...
May 9, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28498865/when-do-traumatic-experiences-alter-risk-taking-behavior-a-machine-learning-analysis-of-reports-from-refugees
#20
Mareike Augsburger, Thomas Elbert
Exposure to traumatic stressors and subsequent trauma-related mental changes may alter a person's risk-taking behavior. It is unclear whether this relationship depends on the specific types of traumatic experiences. Moreover, the association has never been tested in displaced individuals with substantial levels of traumatic experiences. The present study assessed risk-taking behavior in 56 displaced individuals by means of the balloon analogue risk task (BART). Exposure to traumatic events, symptoms of posttraumatic stress disorder and depression were assessed by means of semi-structured interviews...
2017: PloS One
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