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https://www.readbyqxmd.com/read/27913257/prodynorphin-and-kappa-opioid-receptor-mrna-expression-in-the-brain-relates-to-social-status-and-behavior-in-male-european-starlings
#1
Lauren V Riters, Melissa A Cordes, Sharon A Stevenson
Numerous animal species display behavioral changes in response to changes in social status or territory possession. For example, in male European starlings only males that acquire nesting sites display high rates of sexual and agonistic behavior. Past studies show that mu and delta opioid receptors regulate behaviors associated with social ascension or defeat. Opioids also act at kappa receptors, with dynorphin binding with the highest affinity; however, the role of these opioids in social behavior has not been well studied...
November 29, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/27895561/evidence-of-a-role-for-the-lateral-hypothalamic-area-juxtadorsomedial-region-lhajd-in-defensive-behaviors-associated-with-social-defeat
#2
Miguel J Rangel, Marcus V C Baldo, Newton S Canteras, Joel D Hahn
Our understanding of the extrinsic connections of the lateral hypothalamic area (LHA) has deepened in recent years. In particular, a series of studies using neural pathway-tracing methods to investigate the macroconnections of histologically differentiated LHA regions, have revealed that the neural connections of these regions are substantially distinct, and have robust connections with neural circuits controlling survival behaviors. To begin testing functional associations suggested by the distinct LHA region neural connections, the present study has investigated the role of the LHA juxtadorsomedial region (LHAjd) in the control of social defeat (a socially-relevant defensive behavior)...
2016: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/27885045/how-canada-s-asbestos-industry-was-defeated-in-quebec
#3
Kathleen Ruff
Less than a decade ago, the Quebec asbestos industry enjoyed support from all the political parties in the Canadian House of Commons and the Quebec National Assembly, as well as from business and union organizations. Two lobby organizations (Chrysotile Institute and International Chrysotile Association) had significant global impact in promoting asbestos use and defeating asbestos ban efforts in developing countries. Quebec's two asbestos mines planned to expand operations and make Quebec the second biggest global asbestos exporter...
November 23, 2016: New Solutions: a Journal of Environmental and Occupational Health Policy: NS
https://www.readbyqxmd.com/read/27870445/evaluating-social-defeat-as-a-model-for-psychopathology-in-adult-female-rodents
#4
REVIEW
Matia B Solomon
Social conflict is a predominant stressor in humans and is associated with increased risk for developing psychological illnesses including depression and anxiety. Overwhelmingly, more women suffer from these disorders, which may be due to increased stress sensitivity. Like humans, rodents experience a myriad of physiological and behavioral sequelae due to prolonged stress exposure. Although the motivation for social conflict may differ between humans and rodents, female rodents may provide an opportunity to explore the underlying mechanisms by which stress confers risk for psychopathology in women...
January 2, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/27870436/stress-sex-and-motivated-behaviors
#5
REVIEW
Abigail Laman-Maharg, Brian C Trainor
Stress is a major risk factor for development of psychiatric disorders such as depression and development of substance use disorder. Although there are important sex differences in the prevalence of these disorders, most preclinical models used to study stress-induced disorders have used males only. Social defeat stress is a commonly used method to induce stress in an ethologically relevant way but has only recently begun to be used in female rodents. Using these new female models, recent studies have examined how social defeat stress affects males and females differently at the behavioral, circuit, and molecular levels...
January 2, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/27861729/antidepressant-like-effects-of-fenofibrate-in-mice-via-the-hippocampal-bdnf-signaling-pathway
#6
Bo Jiang, Ying-Jie Wang, Hao Wang, Lu Song, Chao Huang, Qing Zhu, Feng Wu, Wei Zhang
BACKGROUND AND PURPOSE: Depression is a neuropsychiatric disorder accompanied by decreased brain derived neurotrophic factor (BDNF) signaling cascade in the hippocampus. Fenofibrate is a selective agonist of peroxisome proliferator-activated receptor-α (PPAR-α). In this study, we investigated the antidepressant-like effects of fenofibrate in C57BL/6 J mice. EXPERIMENTAL APPROACH: The antidepressant-like effects of fenofibrate were first detected in the forced swim test (FST) and tail suspension test (TST), and then assessed in the chronic social defeat stress (CSDS) model...
November 15, 2016: British Journal of Pharmacology
https://www.readbyqxmd.com/read/27853418/low-%C3%AE-2-main-peak-frequency-in-the-electroencephalogram-signs-vulnerability-to-depression
#7
Damien Claverie, Chrystel Becker, Antoine Ghestem, Mathieu Coutan, Françoise Camus, Christophe Bernard, Jean-Jacques Benoliel, Frédéric Canini
Objective: After an intense and repeated stress some rats become vulnerable to depression. This state is characterized by persistent low serum BDNF concentration. Our objective was to determine whether electrophysiological markers can sign vulnerability to depression. Methods: Forty-three Sprague Dawley rats were recorded with supradural electrodes above hippocampus and connected to wireless EEG transmitters. Twenty-nine animals experienced four daily social defeats (SD) followed by 1 month recovery. After SD, 14 rats had persistent low serum BDNF level and were considered as vulnerable (V) while the 15 others were considered as non-vulnerable (NV)...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27810703/histone-deacetylase-and-acetyltransferase-inhibitors-modulate-behavioral-responses-to-social-stress
#8
Katharine E McCann, Anna M Rosenhauer, Genna M F Jones, Alisa Norvelle, Dennis C Choi, Kim L Huhman
Histone acetylation has emerged as a critical factor regulating learning and memory both during and after exposure to stressful stimuli. There are drugs that we now know affect histone acetylation that are already in use in clinical populations. The current study uses these drugs to examine the consequences of acutely increasing or decreasing histone acetylation during exposure to social stress. Using an acute model of social defeat in Syrian hamsters, we systemically and site-specifically administered drugs that alter histone acetylation and measured subsequent behavior and immediate-early gene activity...
January 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/27784204/evaluation-of-molecular-brain-changes-associated-with-environmental-stress-in-rodent-models-compared-to-human-major-depressive-disorder-a-proteomic-systems-approach
#9
David Alan Cox, Michael Gerd Gottschalk, Viktoria Stelzhammer, Hendrik Wesseling, Jason David Cooper, Sabine Bahn
OBJECTIVES: Rodent models of major depressive disorder (MDD) are indispensable when screening for novel treatments, but assessing their translational relevance with human brain pathology has proved difficult. METHODS: Using a novel systems approach, proteomics data obtained from post-mortem MDD anterior prefrontal cortex tissue (n =12) and matched controls (n = 23) were compared with equivalent data from three commonly used preclinical models exposed to environmental stressors (chronic mild stress, prenatal stress, social defeat)...
October 27, 2016: World Journal of Biological Psychiatry
https://www.readbyqxmd.com/read/27781172/residency-in-white-eared-hummingbirds-hylocharis-leucotis-and-its-effect-in-territorial-contest-resolution
#10
Verónica Mendiola-Islas, Carlos Lara, Pablo Corcuera, Pedro Luis Valverde
BACKGROUND: Territory owners usually defeat intruders. One explanation for this observation is the uncorrelated asymmetry hypothesis which argues that contests might be settled by an arbitrary convention such as "owners win." We studied the effect of territorial residency on contest asymmetries in the white-eared hummingbird (Hylocharis leucotis) in a fir forest from central Mexico. METHODS: Twenty white-eared male adult hummingbird territories were monitored during a winter season, recording the territorial behavior of the resident against intruding hummingbirds...
2016: PeerJ
https://www.readbyqxmd.com/read/27773352/dcc-confers-susceptibility-to-depression-like-behaviors-in-humans-and-mice-and-is-regulated-by-mir-218
#11
Angélica Torres-Berrío, Juan Pablo Lopez, Rosemary C Bagot, Dominique Nouel, Gregory Dal Bo, Santiago Cuesta, Lei Zhu, Colleen Manitt, Conrad Eng, Helen M Cooper, Kai-Florian Storch, Gustavo Turecki, Eric J Nestler, Cecilia Flores
BACKGROUD: Variations in the expression of the Netrin-1 guidance cue receptor DCC (deleted in colorectal cancer) appear to confer resilience or susceptibility to psychopathologies involving prefrontal cortex (PFC) dysfunction. METHODS: With the use of postmortem brain tissue, mouse models of defeat stress, and in vitro analysis, we assessed microRNA (miRNA) regulation of DCC and whether changes in DCC levels in the PFC lead to vulnerability to depression-like behaviors...
August 18, 2016: Biological Psychiatry
https://www.readbyqxmd.com/read/27765808/rapid-and-sustained-antidepressant-action-of-the-mglu2-3-receptor-antagonist-mgs0039-in-the-social-defeat-stress-model-comparison-with-ketamine
#12
Chao Dong, Ji-Chun Zhang, Wei Yao, Qian Ren, Min Ma, Chun Yang, Shigeyuki Chaki, Kenji Hashimoto
BACKGROUND: Similar to the N-methyl-D-aspartate receptor antagonist ketamine, the metabotropic glutamate 2/3 receptor antagonist, MGS0039, shows antidepressant effects. However, there are no reports comparing these 2 compounds in the social defeat stress model of depression. METHODS: We examined the effects of MGS0039 (1 mg/kg) and ketamine (10 mg/kg) on depression-like behavior in susceptible mice after repeated social defeat stress. Protein levels of brain-derived neurotrophic factor, TrkB, phospho-TrkB, α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (GluA1), postsynaptic density protein 95, and dendritic spine density in selected brain regions were measured...
October 27, 2016: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27757074/effects-of-duloxetine-treatment-on-cognitive-flexibility-and-bdnf-expression-in-the-mpfc-of-adult-male-mice-exposed-to-social-stress-during-adolescence
#13
Hang Xu, Yu Zhang, Fan Zhang, San-Na Yuan, Feng Shao, Weiwen Wang
Early stress is a significant risk factor for the onset of mood disorders such as depression during adulthood. Impairments in cognitive flexibility mediated by prefrontal cortex (PFC) dysfunction are increasingly recognized as important etiological and pathological factors in the development of depression. Our previous study demonstrated that social defeat stress during early adolescence produced delayed deficits in cognitive flexibility in adult mice. The potential molecular mechanisms underlying these long-term consequences remain unclear...
2016: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/27727240/social-stress-in-adolescents-induces-depression-and-brain-region-specific-modulation-of-the-transcription-factor-max
#14
L S Resende, C E Amaral, R B S Soares, A S Alves, L Alves-Dos-Santos, L R G Britto, S Chiavegatto
MAX is a conserved constitutive small phosphoprotein from a network of transcription factors that are extensively studied in tumorigenesis and whose functions affect cell proliferation, differentiation and death. Inspired by its higher expression during development and in regions involved in emotional behaviors, we hypothesized its involvement in cerebral changes caused by early-life stress. We studied the effects of repeated social stress during adolescence on behaviors and on MAX and its putative partner MYC...
October 11, 2016: Translational Psychiatry
https://www.readbyqxmd.com/read/27711046/histone-lysine-demethylases-of-jmjd2-or-kdm4-family-are-important-epigenetic-regulators-in-reward-circuitry-in-the-etiopathology-of-depression
#15
Salil Saurav Pathak, Swati Maitra, Sumana Chakravarty, Arvind Kumar
Major depressive disorder (MDD) is debilitating mental illness and is one of the leading contributors to global burden of disease, but unfortunately newer and better drugs are not forthcoming. The reason is lack of complete understanding of molecular mechanisms underlying the development of this disorder. Recent research shows dysregulation in epigenetic regulatory mechanisms, particularly the transcriptionally repressive di- and tri-methylation of histone 3 lysine 9 (H3K9me2/me3) in nucleus accumbens (NAc), a critical region of the reward pathway involved in the development of anhedonia, the hallmark of depression...
October 6, 2016: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27703769/testing-the-social-competition-hypothesis-of-depression-using-a-simple-economic-game
#16
Aleksandra Kupferberg, Oliver M Hager, Urs Fischbacher, Laura S Brändle, Melanie Haynes, Gregor Hasler
BACKGROUND: Price's social competition hypothesis interprets the depressive state as an unconscious, involuntary losing strategy, which enables individuals to yield and accept defeat in competitive situations. AIMS: We investigated whether patients who suffer from major depressive disorder (MDD) would avoid competition more often than either patients suffering from borderline personality disorder (BPD) or healthy controls. METHOD: In a simple paper-folding task healthy participants and patiens with MDD and BPD were matched with two opponents, one with an unknown diagnosis and one who shared their clinical diagnosis, and they had to choose either a competitive or cooperative payment scheme for task completion...
March 2016: BJPsych Open
https://www.readbyqxmd.com/read/27693850/selective-amotivation-deficits-following-chronic-psychosocial-stress-in-mice
#17
Alejandro Tsai Cabal, Horea-Ioan Ioanas, Erich Seifritz, Bechara J Saab
Amotivation is a major symptom of several psychiatric disorders. However, which specific motivations are most affected in various illnesses is not well understood. In major depressive disorder (MDD), anecdotal evidence suggests the motivation to explore may be especially affected, but direct evidence from either patients or animal models is lacking. To investigate the potential for, and nature of, exploratory drive deficits in MDD, we subjected mice to a chronic social defeat (CSD) manipulation that gives rise to a MDD-like behavioural ensemble, and performed a behavioural battery to examine bodyweight homeostasis, ambulation, anxiety, exploratory behaviour motivated by either novelty or fear, and short-term memory...
September 28, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/27685775/effects-of-social-stress-and-clomipramine-on-emotional-memory-in-mice
#18
Aranzazu Duque, Concepción Vinader-Caerols, Santiago Monleón
We have previously observed impairing effects of social defeat stress (CSDS) on inhibitory avoidance (IA) in mice. Given the similarity between changes produced by social stress in animals and symptoms of certain human psychopathologies such as depression and anxiety, the effects of the antidepressant clomipramine on IA impairment produced by CSDS were evaluated in the present study. Male CD1 mice were randomly assigned to the groups: non-stressed+saline, non-stressed+clomipramine, stressed+saline and stressed+clomipramine...
2016: Acta Neurobiologiae Experimentalis
https://www.readbyqxmd.com/read/27661416/psychological-pathway-to-suicidal-ideation-among-men-who-have-sex-with-men-in-shanghai-china-a-structural-equation-model
#19
Rui Li, Yong Cai, Ying Wang, Feng Gan, Rong Shi
We aimed to explore the relationships and develop an inter-theoretical model among psychological variables in the progression to suicidal ideation among men who have sex with men (MSM). A cross-sectional study was conducted among 547 MSM in four districts in Shanghai from March to May in 2014. Socio-demographic, psychological, and behavioral information of the participants was collected. A structural equation model (SEM)-Path Analysis was constructed to interpret the intricate relationships among various psychological variables...
September 4, 2016: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/27660201/time-of-day-dependent-adaptation-of-the-hpa-axis-to-predictable-social-defeat-stress
#20
Christiane Koch, Manuela S Bartlang, Jana Thabea Kiehn, Lisa Lucke, Nadine Naujokat, Charlotte Helfrich-Förster, Stefan O Reber, Henrik Oster
In modern societies, the risk of developing a whole array of affective and somatic disorders is associated with the prevalence of frequent psychosocial stress. Therefore, a better understanding of adaptive stress responses and their underlying molecular mechanisms is of high clinical interest. In response to an acute stressor each organism can either show passive freezing or active fight-or-flight behavior, with activation of sympathetic nervous system and the hypothalamus-pituitary-adrenal (HPA) axis providing the necessary energy for the latter by releasing catecholamines and glucocorticoids (GC)...
September 22, 2016: Journal of Endocrinology
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