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Li LF, Yuan W, He ZX, Ma H, Xun YF, Meng LR, Zhu SJ, Wang LM, Zhang J, Cai WQ, Zhang XN, Guo QQ, Lian ZM, Jia R, Tai FD. Reduced Consolation Behaviors in Physically Stressed Mandarin Voles: Involvement of Oxytocin, Dopamine D2, and Serotonin 1A Receptors Within the Anterior Cingulate Cortex. Int J Neuropsychopharmacol 2019; 23:511-523. [PMID: 31760433 PMCID: PMC7689207 DOI: 10.1093/ijnp/pyz060] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 11/05/2019] [Accepted: 11/21/2019] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Consolation is a type of empathy-like behavior that has recently been observed in some socially living rodents. Despite the growing body of literature suggesting that stress affects empathy, the relationship between stress and consolation remains understudied at the preclinical level. Here, we examined the effects of chronic emotional stress or physical stress exposure on consolation and emotional behaviors by using the socially monogamous mandarin vole (Microtus mandarinus) in both males and females. METHOD/RESULTS Physical stress voles were exposed to 14-day social defeat stress, whereas emotional stress voles vicariously experienced the defeat of their partners. We found that physical stress, but not emotional stress, voles showed reduced grooming toward their defeated partners and increased anxiety- and despair-like behaviors. Meanwhile, physical stress voles exhibited decreased neural activity in the anterior cingulate cortex, which is centrally involved in empathy. The densities of oxytocin receptors, dopamine D2 receptors, and serotonin 1A-receptors within the anterior cingulate cortex were significantly decreased in the physical stress group compared with controls. All the behavioral and physiological changes were similar between the sexes. Finally, we found that the reduced consolation behavior and some anxiety-like syndromes in physical stress voles could be alleviated by pretreatment with an oxytocin receptor, D2 receptors, or serotonin 1A-receptor agonist within the anterior cingulate cortex, whereas injections of corresponding receptor antagonists to the control voles decreased the consolation behavior and increased some anxiety-like behaviors. CONCLUSIONS Our results indicated that chronic physical stress exposure impaired consolation and induced anxiety-like behaviors in mandarin voles and oxytocin receptors, 5-HT1A receptors, and D2 receptors within the anterior cingulate cortex may play important roles in these processes.
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Affiliation(s)
- Lai-Fu Li
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China,College of Life Sciences, Nanyang Normal University, Nanyang, China
| | - Wei Yuan
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China,Provincial Key Laboratory of Acupuncture and Medications, Shaanxi University of Chinese Medicine, Xianyang, China
| | - Zhi-Xiong He
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Huan Ma
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Yu-Feng Xun
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Ling-Rong Meng
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Si-Jing Zhu
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Li-Min Wang
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Jing Zhang
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Wen-Qi Cai
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Xue-Ni Zhang
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Qian-Qian Guo
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Zhen-Min Lian
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Rui Jia
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China
| | - Fa-Dao Tai
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi’an, China,Correspondence: Fa-Dao Tai, PhD, College of Life Sciences, Shaanxi Normal University, Xi’an, 710062, China. E-mail:
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Effects of Stathmin 1 Gene Knockout on Behaviors and Dopaminergic Markers in Mice Exposed to Social Defeat Stress. Brain Sci 2019; 9:brainsci9090215. [PMID: 31454951 PMCID: PMC6769668 DOI: 10.3390/brainsci9090215] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2019] [Revised: 08/19/2019] [Accepted: 08/23/2019] [Indexed: 01/08/2023] Open
Abstract
Stathmin (STMN), a microtubule-destabilizing factor, can regulate fear, anxiety, and learning. Social defeat stress (SDS) has detrimental effects on mental health and increases the risk of various psychiatric diseases. This study investigated the effects of STMN1 gene knockout (KO) on behavioral parameters and dopaminergic markers using an SDS mouse model. The STMN1 KO mice showed anxious hyperactivity, impaired object recognition, and decreased levels of neutral and social investigating behaviors at baseline compared to wild-type (WT) mice. The impact of SDS on neutral, social investigating and dominant behaviors differed markedly between the STMN1 WT and KO mice. In addition, different levels of total DARPP-32 and pDARPP-32 Thr75 expression were observed among the control, unsusceptible, and susceptible groups of STMN1 KO mice. Our results show that STMN1 has specific roles in locomotion, object recognition, and social interactions. Moreover, SDS had differential impacts on social interactions and dopaminergic markers between STMN1 WT and KO mice.
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Montagud-Romero S, Blanco-Gandía MC, Reguilón MD, Ferrer-Pérez C, Ballestín R, Miñarro J, Rodríguez-Arias M. Social defeat stress: Mechanisms underlying the increase in rewarding effects of drugs of abuse. Eur J Neurosci 2018; 48:2948-2970. [PMID: 30144331 DOI: 10.1111/ejn.14127] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 06/11/2018] [Accepted: 08/14/2018] [Indexed: 12/27/2022]
Abstract
Social interaction is known to be the main source of stress in human beings, which explains the translational importance of this research in animals. Evidence reported over the last decade has revealed that, when exposed to social defeat experiences (brief episodes of social confrontations during adolescence and adulthood), the rodent brain undergoes remodeling and functional modifications, which in turn lead to an increase in the rewarding and reinstating effects of different drugs of abuse. The mechanisms by which social stress cause changes in the brain and behavior are unknown, and so the objective of this review is to contemplate how social defeat stress induces long-lasting consequences that modify the reward system. First of all, we will describe the most characteristic results of the short- and long-term consequences of social defeat stress on the rewarding effects of drugs of abuse such as psychostimulants and alcohol. Secondly, and throughout the review, we will carefully assess the neurobiological mechanisms underlying these effects, including changes in the dopaminergic system, corticotrophin releasing factor signaling, epigenetic modifications and the neuroinflammatory response. To conclude, we will consider the advantages and disadvantages and the translational value of the social defeat stress model, and will discuss challenges and future directions.
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Affiliation(s)
- Sandra Montagud-Romero
- Department of Psychobiology, Facultad de Psicología, Universitat de Valencia, Valencia, Spain
| | | | - Marina D Reguilón
- Department of Psychobiology, Facultad de Psicología, Universitat de Valencia, Valencia, Spain
| | - Carmen Ferrer-Pérez
- Department of Psychobiology, Facultad de Psicología, Universitat de Valencia, Valencia, Spain
| | - Raul Ballestín
- Department of Psychobiology, Facultad de Psicología, Universitat de Valencia, Valencia, Spain
| | - Jose Miñarro
- Department of Psychobiology, Facultad de Psicología, Universitat de Valencia, Valencia, Spain
| | - Marta Rodríguez-Arias
- Department of Psychobiology, Facultad de Psicología, Universitat de Valencia, Valencia, Spain
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Reguilón MD, Montagud-Romero S, Ferrer-Pérez C, Roger-Sánchez C, Aguilar MA, Miñarro J, Rodríguez-Arias M. Dopamine D 2 receptors mediate the increase in reinstatement of the conditioned rewarding effects of cocaine induced by acute social defeat. Eur J Pharmacol 2017; 799:48-57. [PMID: 28132915 DOI: 10.1016/j.ejphar.2017.01.039] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 01/25/2017] [Accepted: 01/25/2017] [Indexed: 11/28/2022]
Abstract
Social stress modifies the activity of brain areas involved in the rewarding effects of psychostimulants, inducing neuroadaptations in the dopaminergic mesolimbic system and modifying the sensitivity of dopamine receptors. In the present study we evaluated the effect of the dopamine D1- and D2-like receptor antagonists (SCH23390 and raclopride, respectively) on the short-time effects of acute social defeat (ASD). Male OF1 mice were socially defeated before each conditioning session of the conditioned place preference (CPP) induced by 1mg/kg or 25mg/kg of cocaine plus the corresponding dopamine antagonist. A final experiment was designed to evaluate the effect of the dopamine antagonists on the CPP induced by 3mg/kg of cocaine with or without a stress experience. Mice exposed to ASD showed an increase in reinstatement of the conditioned reinforcing effects of cocaine that was blocked by all of the dopamine receptor antagonists. Blockade of dopamine D2-like receptors with raclopride specifically prevented the effects of stress without affecting the rewarding properties of cocaine. However, SCH23390 inhibited cocaine-induced preference in the control groups and even induced aversion in defeated mice conditioned with the lower dose of cocaine. Moreover, the lowest dose of SCH23390 blocked the rewarding effects of 3mg/kg of cocaine-induced CPP. Our results confirm that the dopamine D2 receptor is involved in the short-term effects of ASD on the rewarding effects of cocaine. The dopamine D1 receptor is clearly involved in the rewarding effects of cocaine, but its role in the effects of ASD remains to be demonstrated.
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Affiliation(s)
- Marina Daiana Reguilón
- Department of Psychobiology, Facultad de Psicología, Psicología, Universitat de Valencia, Avda. Blasco Ibáñez, 21, 46010 Valencia, Spain
| | - Sandra Montagud-Romero
- Department of Psychobiology, Facultad de Psicología, Psicología, Universitat de Valencia, Avda. Blasco Ibáñez, 21, 46010 Valencia, Spain
| | - Carmen Ferrer-Pérez
- Department of Psychobiology, Facultad de Psicología, Psicología, Universitat de Valencia, Avda. Blasco Ibáñez, 21, 46010 Valencia, Spain
| | - Concepción Roger-Sánchez
- Department of Psychobiology, Facultad de Psicología, Psicología, Universitat de Valencia, Avda. Blasco Ibáñez, 21, 46010 Valencia, Spain
| | - María Asunción Aguilar
- Department of Psychobiology, Facultad de Psicología, Psicología, Universitat de Valencia, Avda. Blasco Ibáñez, 21, 46010 Valencia, Spain
| | - José Miñarro
- Department of Psychobiology, Facultad de Psicología, Psicología, Universitat de Valencia, Avda. Blasco Ibáñez, 21, 46010 Valencia, Spain
| | - Marta Rodríguez-Arias
- Department of Psychobiology, Facultad de Psicología, Psicología, Universitat de Valencia, Avda. Blasco Ibáñez, 21, 46010 Valencia, Spain.
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Iñiguez SD, Aubry A, Riggs LM, Alipio JB, Zanca RM, Flores-Ramirez FJ, Hernandez MA, Nieto SJ, Musheyev D, Serrano PA. Social defeat stress induces depression-like behavior and alters spine morphology in the hippocampus of adolescent male C57BL/6 mice. Neurobiol Stress 2016; 5:54-64. [PMID: 27981196 PMCID: PMC5154707 DOI: 10.1016/j.ynstr.2016.07.001] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 07/16/2016] [Accepted: 07/29/2016] [Indexed: 12/18/2022] Open
Abstract
Social stress, including bullying during adolescence, is a risk factor for common psychopathologies such as depression. To investigate the neural mechanisms associated with juvenile social stress-induced mood-related endophenotypes, we examined the behavioral, morphological, and biochemical effects of the social defeat stress model of depression on hippocampal dendritic spines within the CA1 stratum radiatum. Adolescent (postnatal day 35) male C57BL/6 mice were subjected to defeat episodes for 10 consecutive days. Twenty-four h later, separate groups of mice were tested on the social interaction and tail suspension tests. Hippocampi were then dissected and Western blots were conducted to quantify protein levels for various markers important for synaptic plasticity including protein kinase M zeta (PKMζ), protein kinase C zeta (PKCζ), the dopamine-1 (D1) receptor, tyrosine hydroxylase (TH), and the dopamine transporter (DAT). Furthermore, we examined the presence of the α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA)-receptor subunit GluA2 as well as colocalization with the post-synaptic density 95 (PSD95) protein, within different spine subtypes (filopodia, stubby, long-thin, mushroom) using an immunohistochemistry and Golgi-Cox staining technique. The results revealed that social defeat induced a depression-like behavioral profile, as inferred from decreased social interaction levels, increased immobility on the tail suspension test, and decreases in body weight. Whole hippocampal immunoblots revealed decreases in GluA2, with a concomitant increase in DAT and TH levels in the stressed group. Spine morphology analyses further showed that defeated mice displayed a significant decrease in stubby spines, and an increase in long-thin spines within the CA1 stratum radiatum. Further evaluation of GluA2/PSD95 containing-spines demonstrated a decrease of these markers within long-thin and mushroom spine types. Together, these results indicate that juvenile social stress induces GluA2- and dopamine-associated dysregulation in the hippocampus - a neurobiological mechanism potentially underlying the development of mood-related syndromes as a consequence of adolescent bullying.
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Affiliation(s)
- Sergio D. Iñiguez
- Department of Psychology, The University of Texas at El Paso, 500 W. University Ave., El Paso, TX, 79902, USA
- Department of Psychology, California State University, San Bernardino, CA, 92407, USA
| | - Antonio Aubry
- Department of Psychology, Hunter College, New York, NY, 10065, USA
- The Graduate Center of CUNY, New York, NY, USA
| | - Lace M. Riggs
- Department of Psychology, California State University, San Bernardino, CA, 92407, USA
| | - Jason B. Alipio
- Department of Psychology, California State University, San Bernardino, CA, 92407, USA
| | | | - Francisco J. Flores-Ramirez
- Department of Psychology, The University of Texas at El Paso, 500 W. University Ave., El Paso, TX, 79902, USA
| | - Mirella A. Hernandez
- Department of Psychology, The University of Texas at El Paso, 500 W. University Ave., El Paso, TX, 79902, USA
- Department of Psychology, California State University, San Bernardino, CA, 92407, USA
| | - Steven J. Nieto
- Department of Psychology, California State University, San Bernardino, CA, 92407, USA
| | - David Musheyev
- Department of Psychology, Hunter College, New York, NY, 10065, USA
| | - Peter A. Serrano
- Department of Psychology, Hunter College, New York, NY, 10065, USA
- The Graduate Center of CUNY, New York, NY, USA
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6
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Role of dopamine neurotransmission in the long-term effects of repeated social defeat on the conditioned rewarding effects of cocaine. Prog Neuropsychopharmacol Biol Psychiatry 2016; 71:144-54. [PMID: 27476156 DOI: 10.1016/j.pnpbp.2016.07.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 06/27/2016] [Accepted: 07/23/2016] [Indexed: 02/06/2023]
Abstract
Numerous studies report that social defeat stress alters dopamine (DA) neurotransmission in several areas of the brain. Alterations of the mesolimbic dopaminergic pathway are believed to be responsible for the increased vulnerability to drug use observed as a result of social stress. In the present study, we evaluated the influence of DA receptors on the long-term effect of repeated social defeat (RSD) on the conditioned rewarding and reinstating effects of cocaine. For this purpose, the D1R antagonist SCH 23390 and the D1R antagonist raclopride were administered 30min before each social defeat and a cocaine-induced CPP procedure was initiated three weeks later. The expression of the D1R and D2R was also measured in the cortex and hippocampus throughout the entire procedure. Mice exposed to RSD showed an increase in the conditioned rewarding effects of cocaine that was blocked by both DA receptors antagonists when a subthreshold dose of cocaine was employed. However, while the vulnerability to reinstatement of the preference induced by 25mg/kg cocaine-induced CPP was abolished by the D1R antagonist, it was practically unaffected by raclopride. Increases in D2R receptor levels were observed in the cortex of defeated animals after the first and fourth social defeats and in the hippocampus 3weeks later. Nevertheless, D1R receptor levels in the hippocampus decreased only after the last social defeat. Our results confirm that RSD enhances the conditioned rewarding effects of cocaine and that both DA receptors are involved in this enduring effect of social stress.
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7
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Kovalenko IL, Smagin DA, Galyamina AG, Orlov YL, Kudryavtseva NN. Changes in the expression of dopaminergic genes in brain structures of male mice exposed to chronic social defeat Stress: An RNA-seq study. Mol Biol 2016. [DOI: 10.1134/s0026893316010088] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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8
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Bagalkot T, Jin HM, Prabhu V, Muna S, Cui Y, Yadav B, Chae HJ, Chung YC. Chronic social defeat stress increases dopamine D2 receptor dimerization in the prefrontal cortex of adult mice. Neuroscience 2015; 311:444-52. [DOI: 10.1016/j.neuroscience.2015.10.024] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Revised: 10/10/2015] [Accepted: 10/12/2015] [Indexed: 12/12/2022]
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9
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Baudry A, Alleaume-Butaux A, Dimitrova-Nakov S, Goldberg M, Schneider B, Launay JM, Kellermann O. Essential Roles of Dopamine and Serotonin in Tooth Repair: Functional Interplay Between Odontogenic Stem Cells and Platelets. Stem Cells 2015; 33:2586-95. [PMID: 25865138 DOI: 10.1002/stem.2037] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 03/06/2015] [Accepted: 03/28/2015] [Indexed: 12/11/2022]
Abstract
Characterizing stem cell intrinsic functions is an ongoing challenge for cell therapies. Here, we report that two independent A4 and H8 stem cell lines isolated from mouse molar pulp display the overall functions of bioaminergic cells. Both clones produce neurotrophins and synthesize, catabolize, store, and transport serotonin (5-hydroxytryptamine [5-HT]) and dopamine (DA). They express 5-HT1D,2B,7 and D1,3 autoreceptors, which render pulpal stem cells competent to respond to circulating 5-HT and DA. We show that injury-activated platelets are the source of systemic 5-HT and DA necessary for dental repair since natural dentin reparation is impaired in two rat models with monoamine storage-deficient blood platelets. Moreover, selective inhibition of either D1, D3, 5-HT2B, or 5-HT7 receptor within the pulp of wild-type rat molars after lesion alters the reparative process. Altogether our data argue that 5-HT and DA coreleased by pulp injury-activated platelets are critical for stem cell-mediated dental repair through 5-HT and DA receptor signalings.
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Affiliation(s)
- Anne Baudry
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124, Paris, France
| | - Aurélie Alleaume-Butaux
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124, Paris, France
| | - Sasha Dimitrova-Nakov
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124, Paris, France
| | - Michel Goldberg
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124, Paris, France
| | - Benoît Schneider
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124, Paris, France
| | - Jean-Marie Launay
- AP-HP, Service de Biochimie, Hôpital Lariboisière, Paris, France.,INSERM U942, Hôpital Lariboisière, Paris, France.,Pharma Research Department, F. Hoffmann-La-Roche, Ltd, Basel, Switzerland
| | - Odile Kellermann
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124, Paris, France
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10
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Jin HM, Shrestha Muna S, Bagalkot TR, Cui Y, Yadav BK, Chung YC. The effects of social defeat on behavior and dopaminergic markers in mice. Neuroscience 2015; 288:167-77. [PMID: 25575945 DOI: 10.1016/j.neuroscience.2014.12.043] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 12/10/2014] [Accepted: 12/26/2014] [Indexed: 11/19/2022]
Abstract
The present study investigated the effects of chronic social defeat stress on several behavioral parameters, and the expression of dopaminergic markers, i.e., dopamine D1 receptors (D1Rs), dopamine D2 receptors (D2Rs), and dopamine and cyclic adenosine 3',5'-monophosphate-regulated phosphoprotein-32 (DARPP-32), in the prefrontal cortex (PFC), amygdala (AMY), and hippocampus (HIP) of mouse brains. After 10days of social defeat stress, the defeated mice were divided into two groups: one group underwent a series of behavioral tests. The other group was sacrificed on the 11th day and tissue samples were collected for Western blotting. The behavioral tests comprised tests of locomotion, light/dark preference, social interaction, as well as the novel object recognition test (NORT), Morris water maze, and forced swimming test (FST). We measured the expression of D1Rs, D2Rs, total DARPP-32, phospho-Thr34 or Thr75-DARPP-32 using Western blotting. The defeated mice showed increased anxiety- and depression-like behaviors, and impaired cognition. No significant differences in D1Rs and D2Rs expression were shown between defeated and control mice in any area studied. A significantly increased expression in total DARPP-32, and phospho-DARPP-32 was observed in the PFC or AMY of defeated mice. These data suggest that alterations in dopaminergic markers may be involved in anxiety- and depression-like behaviors, and cognitive impairment induced by social defeat stress.
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Affiliation(s)
- H-M Jin
- Department of Psychiatry, Chonbuk National University Medical School, Jeonju, Republic of Korea; Research Institute of Clinical Medicine of Chonbuk National University, Biomedical Research Institute of Chonbuk National University Hospital, Jeonju, Republic of Korea.
| | - S Shrestha Muna
- Department of Psychiatry, Chonbuk National University Medical School, Jeonju, Republic of Korea; Research Institute of Clinical Medicine of Chonbuk National University, Biomedical Research Institute of Chonbuk National University Hospital, Jeonju, Republic of Korea.
| | - T R Bagalkot
- Department of Psychiatry, Chonbuk National University Medical School, Jeonju, Republic of Korea; Research Institute of Clinical Medicine of Chonbuk National University, Biomedical Research Institute of Chonbuk National University Hospital, Jeonju, Republic of Korea.
| | - Y Cui
- Department of Psychiatry, Chonbuk National University Medical School, Jeonju, Republic of Korea; Research Institute of Clinical Medicine of Chonbuk National University, Biomedical Research Institute of Chonbuk National University Hospital, Jeonju, Republic of Korea.
| | - B K Yadav
- Department of Neurology, Chonbuk National University Medical School, Jeonju, Republic of Korea.
| | - Y-C Chung
- Department of Psychiatry, Chonbuk National University Medical School, Jeonju, Republic of Korea; Research Institute of Clinical Medicine of Chonbuk National University, Biomedical Research Institute of Chonbuk National University Hospital, Jeonju, Republic of Korea.
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