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Social defeat

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https://www.readbyqxmd.com/read/28511867/social-housing-and-social-isolation-impact-on-stress-indices-and-energy-balance-in-male-and-female-syrian-hamsters-mesocricetus-auratus
#1
Amy P Ross, Alisa Norvelle, Dennis C Choi, James C Walton, H Elliott Albers, Kim L Huhman
Although Syrian hamsters are thought to be naturally solitary, recent evidence from our laboratory demonstrates that hamsters may actually prefer social contact. Hamsters increase their preference for a location associated with an agonistic encounter regardless of whether they have "won" or "lost". It has also been reported that social housing as well as exposure to intermittent social defeat or a brief footshock stressor increase food intake and body mass in hamsters. By contrast, it has also been suggested that housing hamsters in social isolation causes anxiety-induced anorexia and reductions in body mass selectively in females...
May 13, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28500512/molecular-adaptations-to-social-defeat-stress-and-induced-depression-in-mice
#2
Natalya Bondar, Leonid Bryzgalov, Nikita Ershov, Fedor Gusev, Vasiliy Reshetnikov, Damira Avgustinovich, Mikhail Tenditnik, Evgeny Rogaev, Tatiana Merkulova
Chronic stress is a risk factor for major depression. Social defeat stress is a well-validated murine model of depression. However, little is known about the gene activity dynamics during the development of a depression-like state. We analyzed the effects of social defeat stress of varying duration (10 and 30 days) on the behavioral patterns and prefrontal-cortex transcriptome of C57BL/6 mice. The 10-day exposure to social defeat stress resulted in a high level of social avoidance with no signs of depression-associated behavior...
May 12, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28493335/response-of-htr3a-ko-mice-to-antidepressant-treatment-and-chronic-stress
#3
Vincent Martin, Armance Riffaud, Tevrasamy Marday, Charly Brouillard, Bernard Franc, Jean-Pol Tassin, Caroline Sevoz-Couche, Raymond Mongeau, Laurence Lanfumey
BACKGROUND AND PURPOSE: It has recently been suggested that 5-HT3 receptor blockade enhances selective serotonin reuptake inhibitor (SSRI) antidepressants efficacy and may reverse stress-induced deficits in rodents. EXPERIMENTAL APPROACH: To further explore this hypothesis, we used mice lacking the 5-HT3 receptor (Htr3a KO) and their wild-type (WT) controls to assess their response in behavioural paradigms relevant to anxiety and depression. Mice were studied under basal, antidepressant treatments and chronic social defeat stress (CSDS) conditions...
May 10, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28468634/kososan-a-kampo-medicine-prevents-a-social-avoidance-behavior-and-attenuates-neuroinflammation-in-socially-defeated-mice
#4
Naoki Ito, Eiji Hirose, Tatsuya Ishida, Atsushi Hori, Takayuki Nagai, Yoshinori Kobayashi, Hiroaki Kiyohara, Tetsuro Oikawa, Toshihiko Hanawa, Hiroshi Odaguchi
BACKGROUND: Kososan, a Kampo (traditional Japanese herbal) medicine, has been used for the therapy of depressive mood in humans. However, evidence for the antidepressant efficacy of kososan and potential mechanisms are lacking. Recently, it has been recognized that stress triggers neuroinflammation and suppresses adult neurogenesis, leading to depression and anxiety. Here, we examined whether kososan extract affected social behavior in mice exposed to chronic social defeat stress (CSDS), an animal model of prolonged psychosocial stress, and neuroinflammation induced by CSDS...
May 3, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28466092/repeated-social-defeat-and-the-rewarding-effects-of-cocaine-in-adult-and-adolescent-mice-dopamine-transcription-factors-probdnf-signaling-pathways-and-the-trkb-receptor-in-the-mesolimbic-system
#5
Sandra Montagud-Romero, Cristina Nuñez, M Carmen Blanco-Gandia, Elena Martínez-Laorden, María A Aguilar, Javier Navarro-Zaragoza, Pilar Almela, Maria-Victoria Milanés, María-Luisa Laorden, José Miñarro, Marta Rodríguez-Arias
RATIONALE: Repeated social defeat (RSD) increases the rewarding effects of cocaine in adolescent and adult rodents. OBJECTIVE: The aim of the present study was to compare the long-term effects of RSD on the conditioned rewarding effects of cocaine and levels of the transcription factors Pitx3 and Nurr1 in the ventral tegmental area (VTA), the dopamine transporter (DAT), the D2 dopamine receptor (D2DR) and precursor of brain-derived neurotrophic factor (proBDNF) signaling pathways, and the tropomyosin-related kinase B (TrkB) receptor in the nucleus accumbens (NAc) in adult and adolescent mice...
May 2, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28462942/cell-type-specific-epigenetic-editing-at-the-fosb-gene-controls-susceptibility-to-social-defeat-stress
#6
Peter J Hamilton, Dominika J Burek, Sonia I Lombroso, Rachael L Neve, Alfred J Robison, Eric J Nestler, Elizabeth A Heller
Chronic social defeat stress regulates the expression of Fosb in the nucleus accumbens (NAc) to promote the cell-type specific accumulation of ΔFosB in the two medium spiny neuron (MSN) subtypes in this region. ΔFosB is selectively induced in D1-MSNs in the NAc of resilient mice, and in D2-MSNs of susceptible mice. However, little is known about the consequences of such selective induction, particularly in D2-MSNs. This study examined how cell-type specific control of the endogenous Fosb gene in NAc regulates susceptibility to social defeat stress...
May 2, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28453574/social-defeat-stress-causes-depression-like-behavior-with-metabolite-changes-in-the-prefrontal-cortex-of-rats
#7
Yi-Yun Liu, Xin-Yu Zhou, Li-Ning Yang, Hai-Yang Wang, Yu-Qing Zhang, Jun-Cai Pu, Lan-Xiang Liu, Si-Wen Gui, Li Zeng, Jian-Jun Chen, Chan-Juan Zhou, Peng Xie
Major depressive disorder is a serious mental disorder with high morbidity and mortality. The role of social stress in the development of depression remains unclear. Here, we used the social defeat stress paradigm to induce depression-like behavior in rats, then evaluated the behavior of the rats and measured metabolic changes in the prefrontal cortex using gas chromatography-mass spectrometry. Within the first week after the social defeat procedure, the sucrose preference test (SPT), open field test (OFT), elevated plus maze (EPM) and forced swim test (FST) were conducted to examine the depressive-like and anxiety-like behaviors...
2017: PloS One
https://www.readbyqxmd.com/read/28450840/more-than-the-win-the-relation-between-appetitive-competition-motivation-socialization-and-gender-role-orientation-in-women-s-football
#8
Danie Meyer-Parlapanis, Sabrina Siefert, Roland Weierstall
The ability to produce peak performance plays a decisive role in the success of athletes in competitive contest situations. Levels of appetitive competition motivation (ACM), i.e., the desire to defeat an opponent independent of secondary reinforcing factors, were assessed in professional female football/soccer players in the premier and regional leagues, using club level as the measurement of sport success. Furthermore, the influence of social environments predominantly encouraging masculine and competitive play behavior and the players' perceptions of their own gender role orientations were investigated...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28436163/social-defeat-models-in-animal-science-what-we-have-learned-from-rodent-models
#9
REVIEW
Atsushi Toyoda
Studies on stress and its impacts on animals are very important in many fields of science, including animal science, because various stresses influence animal production and animal welfare. In particular, the social stresses within animal groups have profound impact on animals, with the potential to induce abnormal behaviors and health problems. In humans, social stress induces several health problems, including psychiatric disorders. In animal stress models, social defeat models are well characterized and used in various research fields, particularly in studies concerning mental disorders...
April 24, 2017: Animal Science Journal, Nihon Chikusan Gakkaihō
https://www.readbyqxmd.com/read/28434164/microglia-loss-contributes-to-the-development-of-major-depression-induced-by-different-types-of-chronic-stresses
#10
Lijuan Tong, Yu Gong, Peng Wang, Wenfeng Hu, Jili Wang, Zhuo Chen, Wei Zhang, Chao Huang
Recently, the loss and dystrophy of hippocampal microglia induced by chronic unpredictable stress (CUS) has been reported to mediate the development of major depression in mice whose microglial cells were labeled with enhanced green fluorescent protein-conjuncted-CX3C receptor type 1. However, whether this happens in endogenous microglia with no genetic intervention remains unclear. Here, we addressed this issue in mice treated with different types of chronic stresses, including the CUS, chronic restraint stress (CRS) and chronic social defeat stress (CSDS)...
April 22, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28433467/modeling-hypohedonia-following-repeated-social-defeat-individual-vulnerability-and-dopaminergic-involvement
#11
Samantha R Spierling, Maegan Mattock, Eric P Zorrilla
Social defeat in rodents putatively can model hypohedonia. The present studies examined models for assessing hypohedonia-like behavior and tested the hypotheses that 1) individual differences in baseline reward sensitivity predict vulnerability, and 2) defeat elicits changes in pharmacological measures of striatal dopaminergic function. Male Wistar rats (n=142) received repeated defeat (3 "triad" blocks of 3 defeats) or control handling. To determine whether defeat influenced consumption of SuperSac (glucose-saccharin) over an isocaloric, less preferred, glucose solution, a 2-choice paradigm was used...
April 19, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28428145/prior-treadmill-exercise-promotes-resilience-to-vicarious-trauma-in-rats
#12
Camila Kochi, Hesong Liu, Safiyya Zaidi, Fatin Atrooz, Phoebe Dantoin, Samina Salim
BACKGROUND: Post-traumatic stress disorder (PTSD) is a serious psychological condition, which can develop both from physically experiencing and also from witnessing traumatic events. There is evidence that physical exercise can have a positive impact on the symptoms of PTSD. Relevant to this, in our previous pre-clinical work, beneficial effects of treadmill exercise were reported on PTSD-like behaviors in a social defeat paradigm, a rat model of direct physical trauma. However, the role of exercise on vicariously acquired PTSD-like phenotype was not examined...
April 18, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28420401/using-media-to-impact-health-policy-making-an-integrative-systematic-review
#13
REVIEW
Lama Bou-Karroum, Fadi El-Jardali, Nour Hemadi, Yasmine Faraj, Utkarsh Ojha, Maher Shahrour, Andrea Darzi, Maha Ali, Carine Doumit, Etienne V Langlois, Jad Melki, Gladys Honein AbouHaidar, Elie A Akl
INTRODUCTION: Media interventions can potentially play a major role in influencing health policies. This integrative systematic review aimed to assess the effects of planned media interventions-including social media-on the health policy-making process. METHODS: Eligible study designs included randomized and non-randomized designs, economic studies, process evaluation studies, stakeholder analyses, qualitative methods, and case studies. We electronically searched Medline, EMBASE, Communication and Mass Media Complete, Cochrane Central Register of Controlled Trials, and the WHO Global Health Library...
April 18, 2017: Implementation Science: IS
https://www.readbyqxmd.com/read/28418035/chronic-social-defeat-reduces-myelination-in-the-mouse-medial-prefrontal-cortex
#14
Michael L Lehmann, Thaddeus K Weigel, Abdel G Elkahloun, Miles Herkenham
The medial prefrontal cortex (mPFC) plays a key role in top-down control of the brain's stress axis, and its structure and function are particularly vulnerable to stress effects, which can lead to depression in humans and depressive-like states in animals. We tested whether chronic social defeat produces structural alterations in the mPFC in mice. We first performed a microarray analysis of mPFC gene expression changes induced by defeat, and biological pathway analysis revealed a dominant pattern of down-regulation of myelin-associated genes...
April 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28416811/gene-deficiency-and-pharmacological-inhibition-of-caspase-1-confers-resilience-to-chronic-social-defeat-stress-via-regulating-the-stability-of-surface-ampars
#15
M-X Li, H-L Zheng, Y Luo, J-G He, W Wang, J Han, L Zhang, X Wang, L Ni, H-Y Zhou, Z-L Hu, P-F Wu, Y Jin, L-H Long, H Zhang, G Hu, J-G Chen, F Wang
Both inflammatory processes and glutamatergic systems have been implicated in the pathophysiology of mood-related disorders. However, the role of caspase-1, a classic inflammatory caspase, in behavioral responses to chronic stress remains largely unknown. To address this issue, we examined the effects and underlying mechanisms of caspase-1 on preclinical murine models of depression. We found that loss of caspase-1 expression in Caspase-1(-/-) knockout mice alleviated chronic stress-induced depression-like behaviors, whereas overexpression of caspase-1 in the hippocampus of wild-type (WT) mice was sufficient to induce depression- and anxiety-like behaviors...
April 18, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28406523/exposure-to-extrinsic-stressors-social-defeat-or-bisphenol-a-eliminates-sex-differences-in-dna-methyltransferase-expression-in-the-amygdala
#16
Emily C Wright, Sarah A Johnson, Rebecca Hao, Alex S Kowalczyk, Gian D Greenberg, Evelyn Ordoñes Sanchez, Abigail Laman-Maharg, Brian C Trainor, Cheryl S Rosenfeld
Chemical and psychological stressors can exert long lasting changes in brain function and behavior. Changes in DNA methylation have been shown to be an important mechanism mediating long lasting changes in neural function and behavior, especially for anxiety-like or stress responses. Here we examined the effects of either a social or chemical stressor on DNA methyltransferase (DNMT) gene expression in the amygdala, an important brain region modulating stress responses and anxiety. In adult California mice (Peromyscus californicus) that were naïve to social defeat, females had higher levels of Dnmt1 expression in punch samples of the central amygdala (CeA) than males...
April 12, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/28396287/ability-of-palatable-food-consumption-to-buffer-against-the-short-and-long-term-behavioral-consequences-of-social-defeat-exposure-during-juvenility-in-rats
#17
J C MacKay, P Kent, J S James, C Cayer, Z Merali
In adult rats, access to a palatable diet can buffer against the effects of stressors. Approximately 10% of all adolescents are repeatedly victimized by their peers raising the possibility that palatable food consumption may be relevant to this developmental window. This study assessed the long-term impact of juvenile social defeat exposure on anxiety and depressive-like behavior and whether daily limited access to a palatable diet moderated these behavioral consequences. We also investigated the impact of the palatable diet on behavior during the defeat sessions...
April 7, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28392296/anxious-behavior-induces-elevated-hippocampal-cb2-receptor-gene-expression
#18
James M Robertson, Justin K Achua, Justin P Smith, Melissa A Prince, Clarissa D Staton, Patrick J Ronan, Tangi R Summers, Cliff H Summers
Anxiety is differentially expressed across a continuum of stressful/fearful intensity, influenced by endocannabinoid systems and receptors. The hippocampus plays important roles in the regulation of affective behavior, emotion, and anxiety, as well as memory. Location of Cb1/Cb2 receptor action could be important in determining emotional valence, because while the dorsal hippocampus is involved in spatial memory and cognition, the ventral hippocampus has projections to the PFC, BNST, amygdala, and HPA axis, and is important for emotional responses to stress...
June 3, 2017: Neuroscience
https://www.readbyqxmd.com/read/28390864/an-acute-social-defeat-stressor-in-early-puberty-increases-susceptibility-to-social-defeat-in-adulthood
#19
Anna M Rosenhauer, Katharine E McCann, Alisa Norvelle, Kim L Huhman
Syrian hamsters readily display territorial aggression. If they lose even a single agonistic encounter, however, hamsters show striking reductions in aggressive behavior and increases in submissive behavior, a distinct behavioral change that we have previously termed conditioned defeat. This acute social defeat stressor is primarily psychological and is effective in both males and females. Therefore, we maintain that this procedure presents an ideal model for studying behavioral and physiological responses to social stress...
April 25, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28390185/the-non-peptide-vasopressin-v1b-receptor-antagonist-ssr149415-ameliorates-spermatogenesis-function-in-a-mouse-model-of-chronic-social-defeat-stress
#20
Bin Wang, Jian Zhou, Yan-Yan Zhuang, Liang-Liang Wang, Jin-Xian Pu, Yu-Hua Huang, Fei Xia, Jin-Xing Lv
To determine the effects of SSR149415 on testis and spermatogenesis in male mice subjected to chronic social defeat stress, C57BL/6 male mice were divided into 2 groups: Control and Stress. Then Stress group was subdivided into 4 subgroups administered water, SSR149415 (1 mg/kg/day), SSR149415 (10 mg/kg/day), SSR149415 (30 mg/kg/day), respectively. The behavioral alterations revealed by social interaction test and open field test were measured. The physical indices, including body weight and gonad weight (testis and epididymis) as well as testis/body weight and cauda epididymis/body weight were detected...
April 8, 2017: Journal of Cellular Biochemistry
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