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Rappaport LM, Hunter MD, Russell JJ, Pinard G, Bleau P, Moskowitz DS. Emotional and interpersonal mechanisms in community SSRI treatment of social anxiety disorder. J Psychiatry Neurosci 2021; 46:E56-E64. [PMID: 33026311 PMCID: PMC7955850 DOI: 10.1503/jpn.190164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 04/04/2020] [Accepted: 04/06/2020] [Indexed: 11/01/2022] Open
Abstract
BACKGROUND Affective and interpersonal behavioural patterns characteristic of social anxiety disorder show improvement during treatment with serotonin agonists (e.g., selective serotonin reuptake inhibitors), commonly used in the treatment of social anxiety disorder. The present study sought to establish whether, during community psychopharmacological treatment of social anxiety disorder, changes in positive or negative affect and agreeable or quarrelsome behaviour mediate improvement in social anxiety symptom severity or follow from it. METHODS Adults diagnosed with social anxiety disorder (n = 48) recorded their interpersonal behaviour and affect naturalistically in an event-contingent recording procedure for 1-week periods before and during the first 4 months of treatment with paroxetine. Participants and treating psychiatrists assessed the severity of social anxiety symptoms monthly. A multivariate latent change score framework examined temporally lagged associations of change in affect and interpersonal behaviour with change in social anxiety symptom severity. RESULTS Elevated agreeable behaviour and positive affect predicted greater subsequent reduction in social anxiety symptom severity over the following month of treatment. Elevated negative affect, but not quarrelsome behaviour, predicted less subsequent reduction in symptom severity. LIMITATIONS Limitations included limited assessment of extreme behaviour (e.g., violence) that may have precluded examining the efficacy of paroxetine because of the lack of a placebo control group. CONCLUSION The present study suggests that interpersonal behaviour and affect may be putative mechanisms of action for serotonergic treatment of social anxiety disorder. Prosocial behaviour and positive affect increase during serotonergic treatment of social anxiety disorder. Specifically, modulating agreeable behaviour, positive affect and negative affect in individuals' daily lives may partially explain and refine clinical intervention.
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Affiliation(s)
- Lance M Rappaport
- From the Department of Psychology, University of Windsor, Windsor, Ont., Canada (Rappaport); the Virginia Institute for Psychiatric and Behavioral Genetics, Department of Psychiatry, Virginia Commonwealth University, Richmond, VA, USA (Rappaport); the Department of Psychology, McGill University, Montreal, Que., Canada (Rappaport, Russell, Moskowitz); the School of Psychology, Georgia Institute of Technology, Atlanta, GA, USA (Hunter); and the Department of Psychiatry, McGill University, Montreal, Que., Canada (Russell, Pinard, Bleau)
| | - Michael D Hunter
- From the Department of Psychology, University of Windsor, Windsor, Ont., Canada (Rappaport); the Virginia Institute for Psychiatric and Behavioral Genetics, Department of Psychiatry, Virginia Commonwealth University, Richmond, VA, USA (Rappaport); the Department of Psychology, McGill University, Montreal, Que., Canada (Rappaport, Russell, Moskowitz); the School of Psychology, Georgia Institute of Technology, Atlanta, GA, USA (Hunter); and the Department of Psychiatry, McGill University, Montreal, Que., Canada (Russell, Pinard, Bleau)
| | - Jennifer J Russell
- From the Department of Psychology, University of Windsor, Windsor, Ont., Canada (Rappaport); the Virginia Institute for Psychiatric and Behavioral Genetics, Department of Psychiatry, Virginia Commonwealth University, Richmond, VA, USA (Rappaport); the Department of Psychology, McGill University, Montreal, Que., Canada (Rappaport, Russell, Moskowitz); the School of Psychology, Georgia Institute of Technology, Atlanta, GA, USA (Hunter); and the Department of Psychiatry, McGill University, Montreal, Que., Canada (Russell, Pinard, Bleau)
| | - Gilbert Pinard
- From the Department of Psychology, University of Windsor, Windsor, Ont., Canada (Rappaport); the Virginia Institute for Psychiatric and Behavioral Genetics, Department of Psychiatry, Virginia Commonwealth University, Richmond, VA, USA (Rappaport); the Department of Psychology, McGill University, Montreal, Que., Canada (Rappaport, Russell, Moskowitz); the School of Psychology, Georgia Institute of Technology, Atlanta, GA, USA (Hunter); and the Department of Psychiatry, McGill University, Montreal, Que., Canada (Russell, Pinard, Bleau)
| | - Pierre Bleau
- From the Department of Psychology, University of Windsor, Windsor, Ont., Canada (Rappaport); the Virginia Institute for Psychiatric and Behavioral Genetics, Department of Psychiatry, Virginia Commonwealth University, Richmond, VA, USA (Rappaport); the Department of Psychology, McGill University, Montreal, Que., Canada (Rappaport, Russell, Moskowitz); the School of Psychology, Georgia Institute of Technology, Atlanta, GA, USA (Hunter); and the Department of Psychiatry, McGill University, Montreal, Que., Canada (Russell, Pinard, Bleau)
| | - D S Moskowitz
- From the Department of Psychology, University of Windsor, Windsor, Ont., Canada (Rappaport); the Virginia Institute for Psychiatric and Behavioral Genetics, Department of Psychiatry, Virginia Commonwealth University, Richmond, VA, USA (Rappaport); the Department of Psychology, McGill University, Montreal, Que., Canada (Rappaport, Russell, Moskowitz); the School of Psychology, Georgia Institute of Technology, Atlanta, GA, USA (Hunter); and the Department of Psychiatry, McGill University, Montreal, Que., Canada (Russell, Pinard, Bleau)
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Gonzalez I, Polvillo R, Ruiz-Galdon M, Reyes-Engel A, Royo JL. Dysmorphic contribution of neurotransmitter and neuroendocrine system polymorphisms to subtherapeutic mood states. Brain Behav 2019; 9:e01140. [PMID: 30656852 PMCID: PMC6379594 DOI: 10.1002/brb3.1140] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 09/17/2018] [Accepted: 09/20/2018] [Indexed: 01/25/2023] Open
Abstract
OBJECTIVE From an evolutionary perspective, emotions emerged as rapid adaptive reactions that increase survival rates. Current psychobiology includes the consideration that genetic changes affecting neuroendocrine and neurotransmission pathways may also be affecting mood states. Following this hypothesis, abnormal levels of any of the aminergic neurotransmitters would be of considerable importance in the development of a pathophysiological state. MATERIALS AND METHODS A total of 668 students from the School of Medicine of the University of Malaga (Average = 22.41 ± 3; 41% men) provided self-report measures of mood states using POMS and GHQ-28 questionnaires and buccal cells for genotyping 19 polymorphisms from 14 selected neurotransmitter pathways genes (HTR1A; HTR2A; HTR2C; HTR3B; TPH1; SLC18A1; SLC18A2; COMT; MAOA; MAOB) and neuroendocrine system (AVPR1B; OPRM1; BDNF; OXTR). RESULTS MAOA rs3788862 genotype correlates with decreasing levels of Tension among females (beta = -0.168, p-value = 0.003) but it is neutral among males in this subscale. On the contrary, it correlates with lower GHQ-28 depression scores among males (beta = -0.196, p-value = 0.008). Equivalently, SLC18A1 and HTR2A variants correlated with anger and vigor scores, only among males. From the neuroendocrine system, OPRM1 rs1799971 correlated increasing levels of female's Anxiety, depression and Social Dysfunction scores. CONCLUSION Our findings suggest that these polymorphisms contribute to define general population mood levels, although exhibiting a clear sexual dimorphism.
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Affiliation(s)
- Irene Gonzalez
- Department of Surgery, Biochemistry and Immunology, School of Medicine, University of Malaga, Malaga, Spain
| | - Rocio Polvillo
- Department of Surgery, Biochemistry and Immunology, School of Medicine, University of Malaga, Malaga, Spain.,Centro Andaluz de Biología del Desarrollo, Seville, Spain
| | - Maximiliano Ruiz-Galdon
- Department of Surgery, Biochemistry and Immunology, School of Medicine, University of Malaga, Malaga, Spain
| | - Armando Reyes-Engel
- Department of Surgery, Biochemistry and Immunology, School of Medicine, University of Malaga, Malaga, Spain
| | - Jose Luis Royo
- Department of Surgery, Biochemistry and Immunology, School of Medicine, University of Malaga, Malaga, Spain
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Rappaport LM, Russell JJ, Hedeker D, Pinard G, Bleau P, Moskowitz DS. Affect, interpersonal behaviour and interpersonal perception during open-label, uncontrolled paroxetine treatment of people with social anxiety disorder: a pilot study. J Psychiatry Neurosci 2018; 43:407-415. [PMID: 30375835 PMCID: PMC6203550 DOI: 10.1503/jpn.170141] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
BACKGROUND Laboratory-based research with community samples has suggested changes in affective, behavioural and cognitive processes as possible explanations for the effects of serotonergic medications. Examining the effects of serotonergic medications using an ecological momentary measure (such as event-contingent recording) in the daily lives of people with social anxiety disorder would contribute to establishing the effects of these medications on affect, behaviour and one form of cognition: perception of others’ behaviour. METHODS The present study assessed changes in affect, interpersonal behaviour and perception of others’ behaviour in adults with social anxiety disorder using ecological momentary assessment at baseline and over 4 months of a single-arm, uncontrolled, open-label trial of treatment with the selective serotonin reuptake inhibitor paroxetine. RESULTS Anxiety and concurrent depressive symptoms decreased. Participants also reported increased positive and decreased negative affect; increased agreeable and decreased quarrelsome behaviour; increased dominant and decreased submissive behaviour; and increased perception that others behaved agreeably toward them. Moreover, participants demonstrated reduced intraindividual variability in affect, interpersonal behaviour and perception of others’ behaviour. LIMITATIONS Limitations included the lack of a placebo group, the inability to identify the temporal order of changes and the restricted assessment of extreme behaviour. CONCLUSION The results of the present study demonstrate changes during pharmacotherapy in the manifestation of affect, interpersonal behaviour and interpersonal perception in the daily lives of people with social anxiety disorder. Given the importance of interpersonal processes to social anxiety disorder, these results may guide future research seeking to clarify mechanisms of action for serotonergic medications.
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Affiliation(s)
- Lance M. Rappaport
- From the Virginia Institute for Psychiatric and Behavioral Genetics, Department of Psychiatry, Virginia Commonwealth University, Richmond, Va. (Rappaport); the Department of Psychology, McGill University, Montréal, Que. (Rappaport, Russel, Moskowitz); the Department of Psychiatry, McGill University, Montréal, Que. (Russel, Pinard, Bleau); and the Department of Public Health Sciences, University of Chicago, Chicago, Il. (Hedeker)
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Abstract
In the United States, women have long held the right to vote and can participate fully in the political process, and yet they are underrepresented at all levels of elected office. Worldwide, men's dominance in the realm of politics has also been the norm. To date, scholars have focused on supply-side and demand-side explanations of women's underrepresentation but differences in how men and women assess electoral risk (the risk involved in seeking political office) are not fully explained. To fill this gap, I explore how evolutionary theory offers insights into gendered differences in political ambition and the evaluation of electoral risk. Using the framework of life-history theory, I hypothesize that both cognitive and environmental factors in human evolution, particularly as they relate to sexual selection and social roles, have shaped the psychology of ambition in gendered ways affecting contemporary politics. Cognitive risk-assessment mechanisms evolving in the hominid line came to be expressed differently in females and males, in women and men. These gendered expressions plausibly reflect differentiable environmental pressures in the past and may help explain behaviors in and barriers to women’s electoral political activity in the present. If so, then the success of efforts to increase such activity — or, regressively, to suppress it — may be better understood.
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Yamaguchi Y, Lee YA, Kato A, Goto Y. The Roles of Dopamine D1 Receptor on the Social Hierarchy of Rodents and Nonhuman Primates. Int J Neuropsychopharmacol 2016; 20:324-335. [PMID: 27927739 PMCID: PMC5409125 DOI: 10.1093/ijnp/pyw106] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Accepted: 11/18/2016] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Although dopamine has been suggested to play a role in mediating social behaviors of individual animals, it is not clear whether such dopamine signaling contributes to attributes of social groups such as social hierarchy. METHODS In this study, the effects of the pharmacological manipulation of dopamine D1 receptor function on the social hierarchy and behavior of group-housed mice and macaques were investigated using a battery of behavioral tests. RESULTS D1 receptor blockade facilitated social dominance in mice at the middle, but not high or low, social rank in the groups without altering social preference among mates. In contrast, the administration of a D1 receptor antagonist in a macaque did not affect social dominance of the drug-treated animal; however, relative social dominance relationships between the drug-treated and nontreated subjects were altered indirectly through alterations of social affiliative relationships within the social group. CONCLUSIONS These results suggest that dopamine D1 receptor signaling may be involved in social hierarchy and social relationships within a group, which may differ between rodents and primates.
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Affiliation(s)
- Yoshie Yamaguchi
- Primate Research Institute, Kyoto University, Inuyama, Aichi, Japan
| | - Young-A Lee
- Department of Food Science and Nutrition, Catholic University of Daegu, Gyeongsan, Gyeounbuk, South Korea
| | - Akemi Kato
- Primate Research Institute, Kyoto University, Inuyama, Aichi, Japan
| | - Yukiori Goto
- Primate Research Institute, Kyoto University, Inuyama, Aichi, Japan
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Heinz AJ, Beck A, Meyer-Lindenberg A, Sterzer P, Heinz A. Cognitive and neurobiological mechanisms of alcohol-related aggression. Nat Rev Neurosci 2011; 12:400-13. [PMID: 21633380 DOI: 10.1038/nrn3042] [Citation(s) in RCA: 253] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Alcohol-related violence is a serious and common social problem. Moreover, violent behaviour is much more common in alcohol-dependent individuals. Animal experiments and human studies have provided insights into the acute effect of alcohol on aggressive behaviour and into common factors underlying acute and chronic alcohol intake and aggression. These studies have shown that environmental factors, such as early-life stress, interact with genetic variations in serotonin-related genes that affect serotonergic and GABAergic neurotransmission. This leads to increased amygdala activity and impaired prefrontal function that, together, predispose to both increased alcohol intake and impulsive aggression. In addition, acute and chronic alcohol intake can further impair executive control and thereby facilitate aggressive behaviour.
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Affiliation(s)
- Adrienne J Heinz
- Department of Psychology, University of Illinois at Chicago, 1007 W Harrison Street, MC 285 Chicago, Illinois 60607, USA. andreas.heinz@ charite.de
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Affiliation(s)
- Peter Dayan
- Gatsby Computational Neuroscience Unit, University College London, London, WC1N 3AR, UK;
| | - Quentin J.M. Huys
- Gatsby Computational Neuroscience Unit, University College London, London, WC1N 3AR, UK;
- Center for Theoretical Neuroscience, Columbia University, New York, NY 10025;
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Virkkunen M, Goldman D, Linnoila M. Serotonin in alcoholic violent offenders. CIBA FOUNDATION SYMPOSIUM 2007; 194:168-77; discussion 177-82. [PMID: 8862876 DOI: 10.1002/9780470514825.ch10] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Finnish alcoholic, impulsive, habitually violent offenders have been found to have low brain serotonin (5-hydroxytryptamine; 5-HT) turnover which is associated with impaired impulse control, a history of suicide attempts, hypoglycaemic tendency after an oral glucose load and diurnal activity rhythm dysregulation or hyperactivity. Relatively high cerebrospinal fluid (CSF) free testosterone concentration is a further characteristic of the offenders with antisocial personality disorder. The impulsive offenders may represent a behaviourally extreme group of type 2 alcoholics as defined by Cloninger. A large cohort of 800 subjects, including alcoholic violent offenders, their relatives and male controls, has now been gathered from Finland with support from the National Institute on Alcohol Abuse and Alcoholism. About 200 subjects have provided CSF samples. Leukocytes from the whole cohort have been harvested and immortalized. Genes regulating 5-HT functions are now being systematically analysed from these samples. Thus far, polymorphisms of the tryptophan hydroxylase (TPH) and 5-HT2C receptor genes have been the most informative findings.
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Affiliation(s)
- M Virkkunen
- Department of Psychiatry, Helsinki University Central Hospital, Finland
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Murphy SE, Longhitano C, Ayres RE, Cowen PJ, Harmer CJ. Tryptophan supplementation induces a positive bias in the processing of emotional material in healthy female volunteers. Psychopharmacology (Berl) 2006; 187:121-30. [PMID: 16767422 DOI: 10.1007/s00213-006-0401-8] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2006] [Accepted: 04/03/2006] [Indexed: 10/24/2022]
Abstract
RATIONALE The serotonin precursor L-tryptophan (TRP) is available as a nutritional supplement and is licensed as an antidepressant in a number of countries. However, evidence of its efficacy as the primary treatment for depression is limited, and the direct action of TRP on the symptoms of depression and anxiety has not been well-characterised. OBJECTIVES The present study assessed whether TRP induces cognitive changes opposite to the negative biases found in depression and characteristic of those induced by serotonergic antidepressants in healthy volunteers. MATERIALS AND METHODS Thirty eight healthy volunteers were randomised to receive 14 days double-blind intervention with TRP (1 g 3x a day) or placebo. On the final day, emotional processing was assessed using four tasks: facial expression recognition, emotion-potentiated startle, attentional probe and emotional categorisation and memory. RESULTS TRP increased the recognition of happy facial expressions and decreased the recognition of disgusted facial expressions in female, but not male, volunteers. TRP also reduced attentional vigilance towards negative words and decreased baseline startle responsivity in the females. CONCLUSIONS These findings provide evidence that TRP supplementation in women induces a positive bias in the processing of emotional material that is reminiscent of the actions of serotonergic antidepressants. This highlights a key role for serotonin in emotional processing and lends support to the use of TRP as a nutritional supplement in people with mild depression or for prevention in those at risk. Future studies are needed to clarify the effect of tryptophan on these measures in men.
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Affiliation(s)
- Susannah E Murphy
- Department of Psychiatry, University of Oxford, Warneford Hospital, Oxford, OX3 7JX, UK
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Abstract
Models of interpersonal traits have traditionally contained two independent dimensions, one referring to dominance as the opposite of submissiveness and the other referring to agreeableness as the opposite of quarrelsomeness. These models are primarily based on psychometric analyses of the co-occurrence of interpersonal characteristics. The present article reviews literature based on event-contingent recording studies that examine whether the structure of interpersonal behavior as revealed in its everyday occurrence is consistent with this model of interpersonal traits. Evidence from studies of the effects of hierarchical social role situations, the relations between behaviors and affect, and the effects of alterations in serotonin are used to evaluate whether dominance, submissiveness, agreeableness, and quarrelsomeness are related, opposite, or independent behavioral systems. The pattern of findings suggests that agreeableness and quarrelsomeness may be part of the same behavioral system while dominance and submissiveness may have separate underlying behavioral systems.
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Affiliation(s)
- D S Moskowitz
- Department of Psychology, McGill University, Montreal, Quebec, Canada.
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Moskowitz DS, Pinard G, Zuroff DC, Annable L, Young SN. Tryptophan, Serotonin and Human Social Behavior. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2003; 527:215-24. [PMID: 15206735 DOI: 10.1007/978-1-4615-0135-0_25] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Animals research suggests that increasing serotonin can decrease aggression, increase affiliative behaviors and increase dominant behaviors. We tested the relevance of these data to humans by giving 100 healthy people tryptophan (1 g after each meal) and placebo, each for 12 days in a double-blind cross-over study. Social behaviors were studied using an event sampling method in which subjects filled in a one page questionnaire about their behaviors after each social interaction lasting at least 5 minutes. Tryptophan caused a significant decrease in quarrelsome behaviors and a significant increase in dominant behaviors.
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Affiliation(s)
- Deborah S Moskowitz
- Department of Psychology, McGill University, 1205 Dr. Penfield Avenue, Montreal, Quebec, Canada H3A 1B1.
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Heinz A, Mann K, Weinberger DR, Goldman D. Serotonergic Dysfunction, Negative Mood States, and Response to Alcohol. Alcohol Clin Exp Res 2001. [DOI: 10.1111/j.1530-0277.2001.tb02240.x] [Citation(s) in RCA: 139] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Moeller FG, Dougherty DM, Swann AC, Collins D, Davis CM, Cherek DR. Tryptophan depletion and aggressive responding in healthy males. Psychopharmacology (Berl) 1996; 126:97-103. [PMID: 8856827 DOI: 10.1007/bf02246343] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
In order to study the effect of decreasing plasma tryptophan levels on aggressive responding in a controlled laboratory setting, we administered two doses (25 g and 100 g) of a tryptophan-free amino acid mixture to ten healthy male subjects after 24 h of a low tryptophan diet. Subjects were screened for current or past psychiatric, or non-psychiatric medical illness. Aggressive responding on a free-operant laboratory measure of aggression (the Point Subtraction Aggression Paradigm) and plasma tryptophan levels were measured before and after drinking the amino acid mixture. There was a significant increase in aggressive responding 5 h after the 100 g mixture and a significant increase in aggressive responding 6 h after the 25 g mixture compared to a baseline day when no drink was administered. There was also a significant decrease in plasma tryptophan at 5 hours after ingestion compared to baseline for both doses of amino acid mixture. This study supports the hypothesis that tryptophan depletion increases aggressive responding in healthy males in a laboratory setting, probably by decreasing brain serotonin.
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Affiliation(s)
- F G Moeller
- Department of Psychiatry and Behavioral Sciences, University of Texas Houston Health Science Center 77030, USA
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Higley JD, Suomi SJ, Linnoila M. A nonhuman primate model of type II excessive alcohol consumption? Part 1. Low cerebrospinal fluid 5-hydroxyindoleacetic acid concentrations and diminished social competence correlate with excessive alcohol consumption. Alcohol Clin Exp Res 1996; 20:629-42. [PMID: 8800378 DOI: 10.1111/j.1530-0277.1996.tb01665.x] [Citation(s) in RCA: 139] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Developmental, biochemical, and behavioral concomitants of excessive alcohol consumption were investigated using a nonhuman primate model. The variables of interest were: (1) interindividual stability of cerebrospinal fluid (CSF) 5-hydroxyindoleacetic acid (5-HIAA) from infancy to adulthood, (2) effect of parental deprivation early in life on adult CSF 5-HIAA concentrations; (3) correlations between CSF 5-HIAA and 3-methoxy-4-hydroxyphenylglycol (MHPG) concentrations and alcohol consumption; and (4) correlation between the frequency of competent social behaviors and alcohol consumption. Twenty-nine rhesus macaques were reared for their first 6 months either with their mothers or without adults in peer-only conditions. At 6 and 50 months of age, each subject underwent a series of four, 4-day social separations. Cisternal CSF was sampled before and during the first and last separations; concomitantly, observational data were collected on social dominance behavior in the home-cage. When they reached 50 months of age, the monkeys were provided free access to a palatable alcohol solution daily for 1-hr periods before, during, and after the social separations. Before and after the 50-month separations, data were collected on all types of social behavior in the home-cage. Results showed that peer-reared subjects consumed more alcohol than mother-reared subjects during baseline conditions. Mother-reared subjects, however, increased their rates of consumption to equal peer-reared subjects' rates of consumption during the conditions of a social separation stressor. Peer-reared subjects also exhibited lower CSF 5-HIAA concentrations in infancy and adulthood than their mother-reared counterparts. With rearing condition held constant, interindividual differences in CSF 5-HIAA, MHPG, and homovanillic acid were stable from infancy to adulthood, and high rates of alcohol were consumed by the young adult monkeys with low CSF 5-HIAA and MHPG concentrations, particularly when the CSF was obtained during the social separations. High rates of alcohol consumption were also observed in subjects with infrequent social interactions and less competent social behaviors. In contrast to the human data, we found no gender differences in rates of alcohol consumption, nor in the correlations between alcohol consumption and the other variables. With some exceptions, findings from the study are generally consistent with predictions from Cloninger's type II model of excessive alcohol consumption in men with low CSF 5-HIAA, who also exhibit impaired impulse control and violent and antisocial behaviors.
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Affiliation(s)
- J D Higley
- Laboratory of Clinical Studies, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health Animal Center, Poolesville, Maryland 20837, USA
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Higley JD, Suomi SJ, Linnoila M. A nonhuman primate model of type II alcoholism? Part 2. Diminished social competence and excessive aggression correlates with low cerebrospinal fluid 5-hydroxyindoleacetic acid concentrations. Alcohol Clin Exp Res 1996; 20:643-50. [PMID: 8800379 DOI: 10.1111/j.1530-0277.1996.tb01666.x] [Citation(s) in RCA: 121] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The purpose of this study was to develop an animal model for behavioral features of type II, early-onset alcohol abuse. To perform this research, cerebrospinal fluid (CSF) monoamine metabolite concentrations and home-cage social behaviors of 29 rhesus macaque subjects were examined in a 4-year longitudinal study. Half of the monkeys were reared for their first 6 months with their mothers, and the other half were reared without adults, instead with access only to monkeys of similar age. When the subjects were 6 months old, and again when they were 50 months old, they underwent a series of four, 4-day social separations. We obtained cisternal CSF before and during the first and last separation of each series to quantify 5-hydroxyindoleacetic acid (5-HIAA), 3-methoxy-4-hydroxyphenylgycol (MHPG), and homovanillic acid concentrations. After the 6-month separations, subjects were placed into social groups, and social dominance rankings were assessed. Before and after the 50-month separations, social dominance rankings were evaluated again, and home-cage aggression and social behavior data were collected. Over the 3 1/2 years between CSF samplings, records were maintained of subjects' removal from their social groups for excessive aggression or treatment for wounding. Our results showed that among infants, reduced CSF 5-HIAA was correlated with low social dominance. As young adults, subjects from both rearing groups with low CSF 5-HIAA and MHPG concentrations exhibited reduced rates of social interaction and low social dominance rankings. In addition, peer-reared subjects with low CSF 5-HIAA concentrations exhibited inept social behaviors, and were frequently removed from their social groups for excessive aggression and deviant social behaviors. From these results, we conclude that the peer-rearing paradigm aggravates the untoward social consequences associated with low CSF 5-HIAA concentrations over and beyond reducing CSF 5-HIAA concentrations, suggesting that early experiences may contribute to CNS serotonin changes that increase the disposition to type II-related behaviors.
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Affiliation(s)
- J D Higley
- Laboratory of Clinical Studies, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health Animal Center, Poolesville, Maryland 20837, USA
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