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Park J, Moon E, Lim HJ, Kim K, Hong YR, Lee JH. Changes of Locomotor Activity by Dopamine D2, D3 Agonist Quinpirole in Mice Using Home-cage Monitoring System. CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE : THE OFFICIAL SCIENTIFIC JOURNAL OF THE KOREAN COLLEGE OF NEUROPSYCHOPHARMACOLOGY 2023; 21:686-692. [PMID: 37859441 PMCID: PMC10591172 DOI: 10.9758/cpn.22.1016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 10/26/2022] [Accepted: 11/18/2022] [Indexed: 10/21/2023]
Abstract
Objective : As dopamine is closely linked to locomotor activities, animal studies on locomotor activities using dopaminergic agents were widely done. However, most of animal studies were performed for a short period that there is a lack of longitudinal study on the effects of dopaminergic agents on locomotor activities. This study aimed to examine the longterm effect of a dopamine D2, D3 agonist quinpirole on locomotor activities in mice using a home-cage monitoring system. Methods : The locomotor activities of Institute Cancer Research mice were measured by infrared motion detectors in home-cages under the 12-hour dark and 12-hour light condition for three days after the quinpirole injection. Quinpirole was injected at a concentration of 0.5 mg/kg intraperitoneally in the beginning of the dark phase. The locomotor activities before and after the quinpirole administration were compared by the Wilcoxon signed-rank test and one-way repeated measures ANOVA. Results : After the quinpirole administration, the 24-hour total locomotor activity did not change (p = 0.169), but activities were significantly increased in the 12-hour dark phase sum (p = 0.013) and decreased in the 12-hour light phase sum (p = 0.009). Significant increases in the activities were observed in the dark-light difference (p = 0.005) and dark-light ratio (p = 0.005) as well. Conclusion : This study suggests that quinpirole injection entrains the circadian rest-activity rhythm of locomotor activities. Therefore, quinpirole can be a drug that mediates locomotor activity as a dopamine agonist as well as a modulator of the circadian rhythms.
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Affiliation(s)
- Jeonghyun Park
- Department of Psychiatry and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Eunsoo Moon
- Department of Psychiatry and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
- Department of Psychiatry, Pusan National University School of Medicine, Yangsan, Korea
| | - Hyun Ju Lim
- Department of Psychiatry and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
- Department of Psychology, Gyeongsang National University, Jinju, Korea
| | - Kyungwon Kim
- Department of Psychiatry and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Yoo Rha Hong
- Department of Pediatrics, Kosin University College of Medicine, Busan, Korea
| | - Jung Hyun Lee
- Department of Pediatrics, Kosin University College of Medicine, Busan, Korea
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Lee NS, Kim CY, Beery AK. Peer Social Environment Impacts Behavior and Dopamine D1 Receptor Density in Prairie Voles (Microtus ochrogaster). Neuroscience 2023; 515:62-70. [PMID: 36796749 DOI: 10.1016/j.neuroscience.2023.02.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Revised: 12/27/2022] [Accepted: 02/05/2023] [Indexed: 02/16/2023]
Abstract
Prairie voles (Microtus ochrogaster) are socially monogamous rodents that form selective, long-lasting relationships with mates and with same-sex peers. It is unknown to what extent mechanisms supporting 'peer relationships' are similar to those involved in mate relationships. The formation of pair bonds is dependent on dopamine neurotransmission, whereas the formation of peer relationships is not, providing evidence of relationship type-specificity. The current study assessed endogenous structural changes in dopamine D1 receptor density in male and female voles across different social environments, including long-term same-sex partnerships, new same-sex partnerships, social isolation, and group housing. We also related dopamine D1 receptor density and social environment to behavior in social interaction and partner preference tests. Unlike prior findings in mate pairs, voles paired with new same-sex partners did not exhibit upregulated D1 binding in the nucleus accumbens (NAcc) relative to controls paired from weaning. This is consistent with differences in relationship type: D1 upregulation in pair bonds aids in maintaining exclusive relationships through selective aggression, and we found that formation of new peer relationships did not enhance aggression. Isolation led to increases in NAcc D1 binding, and even across socially housed voles, individuals with higher D1 binding exhibited increased social avoidance. These findings suggest that elevated D1 binding may be both a cause and a consequence of reduced prosociality. These results highlight the neural and behavioral consequences of different non-reproductive social environments and contribute to growing evidence that the mechanisms underlying reproductive and non-reproductive relationship formation are distinct. Elucidation of the latter is necessary to understand mechanisms underlying social behavior beyond a mating context.
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Affiliation(s)
- Nicole S Lee
- Neuroscience and Behavior Program, University of Massachusetts, Amherst, MA 01003, USA; Department of Integrative Biology, UC Berkeley, Berkeley, CA 94720, USA
| | - Claire Y Kim
- Neuroscience Program, Department of Psychology, Smith College, Northampton, MA 01063, USA
| | - Annaliese K Beery
- Neuroscience and Behavior Program, University of Massachusetts, Amherst, MA 01003, USA; Neuroscience Program, Department of Psychology, Smith College, Northampton, MA 01063, USA; Department of Integrative Biology, UC Berkeley, Berkeley, CA 94720, USA.
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Bergamini G, Mechtersheimer J, Azzinnari D, Sigrist H, Buerge M, Dallmann R, Freije R, Kouraki A, Opacka-Juffry J, Seifritz E, Ferger B, Suter T, Pryce CR. Chronic social stress induces peripheral and central immune activation, blunted mesolimbic dopamine function, and reduced reward-directed behaviour in mice. Neurobiol Stress 2018; 8:42-56. [PMID: 29888303 PMCID: PMC5991330 DOI: 10.1016/j.ynstr.2018.01.004] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 12/19/2017] [Accepted: 01/31/2018] [Indexed: 12/19/2022] Open
Abstract
Psychosocial stress is a major risk factor for depression, stress leads to peripheral and central immune activation, immune activation is associated with blunted dopamine (DA) neural function, DA function underlies reward interest, and reduced reward interest is a core symptom of depression. These states might be inter-independent in a complex causal pathway. Whilst animal-model evidence exists for some specific steps in the pathway, there is currently no animal model in which it has been demonstrated that social stress leads to each of these immune, neural and behavioural states. Such a model would provide important existential evidence for the complex pathway and would enable the study of causality and mediating mechanisms at specific steps in the pathway. Therefore, in the present mouse study we investigated for effects of 15-day resident-intruder chronic social stress (CSS) on each of these states. Relative to controls, CSS mice exhibited higher spleen levels of granulocytes, inflammatory monocytes and T helper 17 cells; plasma levels of inducible nitric oxide synthase; and liver expression of genes encoding kynurenine pathway enzymes. CSS led in the ventral tegmental area to higher levels of kynurenine and the microglia markers Iba1 and Cd11b and higher binding activity of DA D1 receptor; and in the nucleus accumbens (NAcc) to higher kynurenine, lower DA turnover and lower c-fos expression. Pharmacological challenge with DA reuptake inhibitor identified attenuation of DA stimulatory effects on locomotor activity and NAcc c-fos expression in CSS mice. In behavioural tests of operant responding for sucrose reward validated as sensitive assays for NAcc DA function, CSS mice exhibited less reward-directed behaviour. Therefore, this mouse study demonstrates that a chronic social stressor leads to changes in each of the immune, neural and behavioural states proposed to mediate between stress and disruption of DA-dependent reward processing. The model can now be applied to investigate causality and, if demonstrated, underlying mechanisms in specific steps of this immune-neural-behavioural pathway, and thereby to identify potential therapeutic targets. Mouse chronic social stress (CSS) leads to spleen and liver immune activation. Mouse CSS leads to mesolimbic immune activation and blunted dopamine function. Mouse CSS leads to reduced reward-directed behaviour in operant tests. This constitutes an important model for the study of pathophysiological mechanisms.
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Affiliation(s)
- Giorgio Bergamini
- Preclinical Laboratory for Translational Research into Affective Disorders, Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zurich, Switzerland.,Center for Clinical Studies, Vetsuisse Faculty, University of Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and ETH Zurich, Switzerland
| | - Jonas Mechtersheimer
- Preclinical Laboratory for Translational Research into Affective Disorders, Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zurich, Switzerland
| | - Damiano Azzinnari
- Preclinical Laboratory for Translational Research into Affective Disorders, Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and ETH Zurich, Switzerland
| | - Hannes Sigrist
- Preclinical Laboratory for Translational Research into Affective Disorders, Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zurich, Switzerland
| | - Michaela Buerge
- Preclinical Laboratory for Translational Research into Affective Disorders, Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and ETH Zurich, Switzerland
| | - Robert Dallmann
- Warwick Medical School, University of Warwick, Coventry, United Kingdom
| | | | - Afroditi Kouraki
- Department of Life Sciences, University of Roehampton, London, UK
| | | | - Erich Seifritz
- Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and ETH Zurich, Switzerland
| | - Boris Ferger
- CNS Diseases Research Germany, Boehringer Ingelheim Pharma GmbH & Co. KG., Biberach, Germany
| | - Tobias Suter
- Neuroimmunology and MS Research, Neurology, and Clinical Research Priority Program Multiple Sclerosis, University Hospital Zurich, University of Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and ETH Zurich, Switzerland
| | - Christopher R Pryce
- Preclinical Laboratory for Translational Research into Affective Disorders, Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and ETH Zurich, Switzerland
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