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Keck J, Honekamp C, Gebhardt K, Nolte S, Linka M, de Haas B, Munzert J, Krüger K, Krüger B. Exercise-induced inflammation alters the perception and visual exploration of emotional interactions. Brain Behav Immun Health 2024; 39:100806. [PMID: 38974339 PMCID: PMC11225855 DOI: 10.1016/j.bbih.2024.100806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 05/08/2024] [Accepted: 06/10/2024] [Indexed: 07/09/2024] Open
Abstract
Introduction The study aimed to investigate whether an exercise-induced pro-inflammatory response alters the perception as well as visual exploration of emotional body language in social interactions. Methods In a within-subject design, 19 male, healthy adults aged between 19 and 33 years performed a downhill run for 45 min at 70% of their VO2max on a treadmill to induce maximal myokine blood elevations, leading to a pro-inflammatory status. Two control conditions were selected: a control run with no decline and a rest condition without physical exercise. Blood samples were taken before (T0), directly after (T1), 3 h after (T3), and 24 h after (T24) each exercise for analyzing the inflammatory response. 3 h after exercise, participants observed point-light displays (PLDs) of human interactions portraying four emotions (happiness, affection, sadness, and anger). Participants categorized the emotional content, assessed the emotional intensity of the stimuli, and indicated their confidence in their ratings. Eye movements during the entire paradigm and self-reported current mood were also recorded. Results The downhill exercise condition resulted in significant elevations of measured cytokines (IL6, CRP, MCP-1) and markers for muscle damage (Myoglobin) compared to the control running condition, indicating a pro-inflammatory state after the downhill run. Emotion recognition rates decreased significantly after the downhill run, whereas no such effect was observed after control running. Participants' sensitivity to emotion-specific cues also declined. However, the downhill run had no effect on the perceived emotional intensity or the subjective confidence in the given ratings. Visual scanning behavior was affected after the downhill run, with participants fixating more on sad stimuli, in contrast to the control conditions, where participants exhibited more fixations while observing happy stimuli. Conclusion Our study demonstrates that inflammation, induced through a downhill running model, impairs perception and emotional recognition abilities. Specifically, inflammation leads to decreased recognition rates of emotional content of social interactions, attributable to diminished discrimination capabilities across all emotional categories. Additionally, we observed alterations in visual exploration behavior. This confirms that inflammation significantly affects an individual's responsiveness to social and affective stimuli.
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Affiliation(s)
- Johannes Keck
- Neuromotor Behavior Lab, Institute of Sports Science, Justus-Liebig-University Giessen, Giessen, Germany
- Center for Mind, Brain and Behavior (CMBB), Phillips University of Marburg and Justus-Liebig-University Giessen, Germany
| | - Celine Honekamp
- Sensorimotor Control and Learning, Centre for Cognitive Science, Technical University of Darmstadt, Germany
| | - Kristina Gebhardt
- Department of Exercise Physiology and Sports Therapy, Institute of Sports Science, Justus-Liebig-University Giessen, Giessen, Germany
| | - Svenja Nolte
- Department of Exercise Physiology and Sports Therapy, Institute of Sports Science, Justus-Liebig-University Giessen, Giessen, Germany
| | - Marcel Linka
- Department of Experimental Psychology, Justus-Liebig-University Giessen, Germany
| | - Benjamin de Haas
- Department of Experimental Psychology, Justus-Liebig-University Giessen, Germany
- Center for Mind, Brain and Behavior (CMBB), Phillips University of Marburg and Justus-Liebig-University Giessen, Germany
| | - Jörn Munzert
- Neuromotor Behavior Lab, Institute of Sports Science, Justus-Liebig-University Giessen, Giessen, Germany
- Center for Mind, Brain and Behavior (CMBB), Phillips University of Marburg and Justus-Liebig-University Giessen, Germany
| | - Karsten Krüger
- Department of Exercise Physiology and Sports Therapy, Institute of Sports Science, Justus-Liebig-University Giessen, Giessen, Germany
| | - Britta Krüger
- Neuromotor Behavior Lab, Institute of Sports Science, Justus-Liebig-University Giessen, Giessen, Germany
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Flasbeck V, Dersch N, Engler H, Schedlowski M, Brüne M. Acute experimental inflammation in healthy women attenuates empathy for psychological pain. Brain Behav Immun 2024; 119:1-5. [PMID: 38548183 DOI: 10.1016/j.bbi.2024.03.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 02/16/2024] [Accepted: 03/26/2024] [Indexed: 06/11/2024] Open
Abstract
Administration of low-dose lipopolysaccharide (LPS) to healthy humans is a translational approach to analyze the effects of acute systemic inflammation and sickness behavior. Although studies documented that LPS-induced inflammation can alter social behavior, its impact on empathy remains poorly understood. In this double-blind, placebo-controlled study, 52 healthy female volunteers received an intravenous injection of either LPS (0.4 ng/kg body weight) or placebo and completed the Social Interaction Empathy Task (SIET) two hours after injection. Physiological responses (blood pressure, heart rate, body temperature, cytokines, cortisol) were analyzed along with sickness symptoms and mood before and after LPS or placebo administration. LPS application led to significant increases in plasma cytokines and sickness symptoms as well as low mood. Moreover, volunteers receiving LPS showed significantly less empathy for other's psychological pain than those who received placebo. Furthermore, LPS-injected volunteers with more severe sickness symptoms displayed higher pain ratings in the first-person perspective. Thus, low-grade inflammation reduces empathy for other's psychological pain which might reflect an adaptive strategy to save energy by not responding empathetically when sick oneself.
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Affiliation(s)
- Vera Flasbeck
- LWL University Hospital Bochum, Department of Psychiatry, Psychotherapy and Preventive Medicine, Division of Social Neuropsychiatry and Evolutionary Medicine, Ruhr University Bochum, Bochum, NRW, Germany.
| | - Nele Dersch
- LWL University Hospital Bochum, Department of Psychiatry, Psychotherapy and Preventive Medicine, Division of Social Neuropsychiatry and Evolutionary Medicine, Ruhr University Bochum, Bochum, NRW, Germany
| | - Harald Engler
- Institute of Medical Psychology and Behavioral Immunobiology, Center for Translational Neuro- and Behavioral Sciences, University Hospital Essen, University of Duisburg-Essen, Essen, NRW, Germany
| | - Manfred Schedlowski
- Institute of Medical Psychology and Behavioral Immunobiology, Center for Translational Neuro- and Behavioral Sciences, University Hospital Essen, University of Duisburg-Essen, Essen, NRW, Germany; Osher Center for Integrative Health, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Martin Brüne
- LWL University Hospital Bochum, Department of Psychiatry, Psychotherapy and Preventive Medicine, Division of Social Neuropsychiatry and Evolutionary Medicine, Ruhr University Bochum, Bochum, NRW, Germany
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Chang CY, Chang HH, Wu CY, Tsai YT, Lu TH, Chang WH, Hsu CF, Chen PS, Tseng HH. Peripheral inflammation is associated with impaired sadness recognition in euthymic bipolar patients. J Psychiatr Res 2024; 173:333-339. [PMID: 38579478 DOI: 10.1016/j.jpsychires.2024.03.049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 03/06/2024] [Accepted: 03/26/2024] [Indexed: 04/07/2024]
Abstract
BACKGROUND Inflammation impairs cognitive function in healthy individuals and people with psychiatric disorders, such as bipolar disorder (BD). This effect may also impact emotion recognition, a fundamental element of social cognition. Our study aimed to investigate the relationships between pro-inflammatory cytokines and emotion recognition in euthymic BD patients and healthy controls (HCs). METHODS We recruited forty-four euthymic BD patients and forty healthy controls (HCs) and measured their inflammatory markers, including high-sensitivity C-reactive protein (hs-CRP), interleukin-6 (IL-6), and TNF-α. We applied validated cognitive tasks, the Wisconsin Card-Sorting Test (WCST) and Continuous Performance Test (CPT), and a social cognitive task for emotion recognition, Diagnostic Analyses of Nonverbal Accuracy, Taiwanese Version (DANVA-2-TW). We analyzed the relationships between cytokines and cognition and then explored possible predictive factors of sadness recognition accuracy. RESULTS Regarding pro-inflammatory cytokines, TNF-α was elevated in euthymic BD patients relative to HCs. In euthymic BD patients only, higher TNF-α levels were associated with lower accuracy of sadness recognition. Regression analysis revealed that TNF-α was an independent predictive factor of sadness recognition in patients with euthymic BD when neurocognition was controlled for. CONCLUSIONS We demonstrated that enhanced inflammation, indicated by increased TNF-α, was an independent predictive factor of impaired sadness recognition in BD patients but not in HCs. Our findings suggested a direct influence of TNF-α on sadness recognition and indicated vulnerability to depression in euthymic BD patients with chronic inflammation.
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Affiliation(s)
- Chih-Yu Chang
- Department of Medicine, College of Medicine, National Cheng Kung University, Taiwan
| | - Hui Hua Chang
- Institute of Clinical Pharmacy and Pharmaceutical Sciences, College of Medicine, National Cheng University, Tainan, Taiwan; School of Pharmacy, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Department of Pharmacy, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Department of Pharmacy, National Cheng Kung University Hospital, Dou-Liou Branch, Yunlin, Taiwan
| | - Cheng Ying Wu
- Department of Psychiatry, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Ying Tsung Tsai
- Department of Psychiatry, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Tsung-Hua Lu
- Department of Psychiatry, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Wei Hung Chang
- Department of Psychiatry, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Department of Psychiatry, National Cheng Kung University Hospital, Dou-Liou Branch, Yunlin, Taiwan
| | - Chia-Fen Hsu
- Department of Occupational Therapy, College of Medicine, National Cheng Kung University, Tainan City, Taiwan
| | - Po See Chen
- Department of Psychiatry, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Institute of Behavioral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Department of Public Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Huai-Hsuan Tseng
- Department of Psychiatry, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Institute of Behavioral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Department of Public Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
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Deng F, Bueber MA, Cao Y, Tang J, Bai X, Cho Y, Lee J, Lin Z, Yang Q, Keshavan MS, Stone WS, Qian M, Yang LH, Phillips MR. Assessing social cognition in patients with schizophrenia and healthy controls using the reading the mind in the eyes test (RMET): a systematic review and meta-regression. Psychol Med 2024; 54:847-873. [PMID: 38173096 DOI: 10.1017/s0033291723003501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
The reading the mind in the eyes test (RMET) - which assesses the theory of mind component of social cognition - is often used to compare social cognition between patients with schizophrenia and healthy controls. There is, however, no systematic review integrating the results of these studies. We identified 198 studies published before July 2020 that administered RMET to patients with schizophrenia or healthy controls from three English-language and two Chinese-language databases. These studies included 41 separate samples of patients with schizophrenia (total n = 1836) and 197 separate samples of healthy controls (total n = 23 675). The pooled RMET score was 19.76 (95% CI 18.91-20.60) in patients and 25.53 (95% CI 25.19-25.87) in controls (z = 12.41, p < 0.001). After excluding small-sample outlier studies, this difference in RMET performance was greater in studies using non-English v. English versions of RMET (Chi [Q] = 8.54, p < 0.001). Meta-regression analyses found a negative association of age with RMET score and a positive association of years of schooling with RMET score in both patients and controls. A secondary meta-analysis using a spline construction of 180 healthy control samples identified a non-monotonic relationship between age and RMET score - RMET scores increased with age before 31 and decreased with age after 31. These results indicate that patients with schizophrenia have substantial deficits in theory of mind compared with healthy controls, supporting the construct validity of RMET as a measure of social cognition. The different results for English versus non-English versions of RMET and the non-monotonic relationship between age and RMET score highlight the importance of the language of administration of RMET and the possibility that the relationship of aging with theory of mind is different from the relationship of aging with other types of cognitive functioning.
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Affiliation(s)
- Fei Deng
- Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- University of Nottingham School of Economics (Ningbo China), Zhejiang, China
| | - Marlys A Bueber
- Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yourong Cao
- Guangxi Medical University School of Public Health, Guangxi, China
- The Reproductive Hospital of Guangxi Zhuang Autonomous Region, Guangxi, China
| | - Jeff Tang
- New York University, New York, NY, USA
| | - Xinyu Bai
- Guangxi Medical University School of Public Health, Guangxi, China
- Guangxi Academy of Medical Sciences & The People's Hospital of Guangxi Zhuang Autonomous Region, Guangxi, China
| | - Young Cho
- New York State Psychiatric Institute, New York, NY, USA
| | - Jiwon Lee
- Teachers College, Columbia University, New York, NY, USA
| | - Zhuozhi Lin
- Department of Mental Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA
| | - Qi Yang
- Ningxia Medical University School of Public Health, Ningxia, China
| | - Matcheri S Keshavan
- Harvard Medical School Department of Psychiatry at Beth Israel Deaconess Medical Center, Boston, MA, USA
| | - William S Stone
- Harvard Medical School Department of Psychiatry at Beth Israel Deaconess Medical Center, Boston, MA, USA
| | - Min Qian
- Department of Biostatistics, Columbia University Mailman School of Public Health, New York, NY, USA
| | - Lawrence H Yang
- New York University, New York, NY, USA
- Department of Epidemiology, Columbia University Mailman School of Public Health, New York, NY, USA
| | - Michael R Phillips
- Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Epidemiology, Columbia University Mailman School of Public Health, New York, NY, USA
- Department of Psychiatry, Columbia University, New York, NY, USA
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Abstract
Frameworks of emotional development have tended to focus on how environmental factors shape children's emotion understanding. However, individual experiences of emotion represent a complex interplay between both external environmental inputs and internal somatovisceral signaling. Here, we discuss the importance of afferent signals and coordination between central and peripheral mechanisms in affective response processing. We propose that incorporating somatovisceral theories of emotions into frameworks of emotional development can inform how children understand emotions in themselves and others. We highlight promising directions for future research on emotional development incorporating this perspective, namely afferent cardiac processing and interoception, immune activation, physiological synchrony, and social touch.
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Affiliation(s)
- Kelly E Faig
- Department of Psychology, Hamilton College, 198 College Hill Road, Clinton, NY 13502
| | - Karen E Smith
- Department of Psychology, the University of Wisconsin, 1500 Highland Blvd, Madison, WI, 53705
| | - Stephanie J Dimitroff
- Department of Psychology, Universität Konstanz, Universitätsstraße 10, 78464 Konstanz, Germany
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Social interaction, psychotic disorders and inflammation: A triangle of interest. Prog Neuropsychopharmacol Biol Psychiatry 2023; 122:110697. [PMID: 36521587 DOI: 10.1016/j.pnpbp.2022.110697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 12/09/2022] [Indexed: 12/14/2022]
Abstract
Social interaction difficulties are a hallmark of psychotic disorders, which in some cases can be definitely traced back to autoimmunological causes. Interestingly, systemic and intrathecal inflammation have been shown to significantly influence social processing by increasing sensitivity to threatening social stimuli, which bears some resemblance to psychosis. In this article, we review evidence for the involvement of systemic and intrathecal inflammatory processes in psychotic disorders and how this might help to explain some of the social impairments associated with this group of disorders. Vice versa, we also discuss evidence for the immunomodulatory function of social interactions and their potential role for therapeutic interventions in psychotic disorders.
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Irwin MR, Boyle CC, Cho JH, Piber D, Breen EC, Sadeghi N, Castillo D, Smith M, Eisenberger NI, Olmstead R. Sleep and Healthy Aging Research on Depression (SHARE-D) randomized controlled trial: Protocol overview of an experimental model of depression with insomnia, inflammation, and affect mechanisms in older adults. Brain Behav Immun Health 2023; 28:100601. [PMID: 36879913 PMCID: PMC9984307 DOI: 10.1016/j.bbih.2023.100601] [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: 01/12/2023] [Revised: 01/31/2023] [Accepted: 02/02/2023] [Indexed: 02/05/2023] Open
Abstract
Depression, one of the most common diseases in older adults, carries significant risk for morbidity and mortality. Because of the burgeoning population of older adults, the enormous burden of late-life depression, and the limited efficacy of current antidepressants in older adults, biologically plausible models that translate into selective depression prevention strategies are needed. Insomnia predicts depression recurrence and is a modifiable target to prevent incident and recurrent depression in older adults. Yet, it is not known how insomnia gets converted into biological- and affective risk for depression, which is critical for identification of molecular targets for pharmacologic interventions, and for refinement of insomnia treatments that target affective responding to improve efficacy. Sleep disturbance activates inflammatory signaling and primes immune responses to subsequent inflammatory challenge. In turn, inflammatory challenge induces depressive symptoms, which correlate with activation of brain regions implicated in depression. This study hypothesizes that insomnia serves as a vulnerability factor for inflammation-related depression; older adults with insomnia will show heightened inflammatory- and affective responding to inflammatory challenge as compared to those without insomnia. To test this hypothesis, this protocol paper describes a placebo-controlled, randomized, double-blind study of low dose endotoxin in older adults (n = 160; 60-80 y) with insomnia vs. comparison controls without insomnia. The aims of this study are to examine differences in depressive symptoms, measures of negative affective responding, and measures of positive affective responding as a function of insomnia and inflammatory challenge. If the hypotheses are confirmed, older adults with two "hits", insomnia and inflammatory activation, would represent a high risk group to be prioritized for monitoring and for depression prevention efforts using treatments that target insomnia or inflammation. Moreover, this study will inform the development of mechanism-based treatments that target affect responses in addition to sleep behaviors, and which might also be coupled with efforts to reduce inflammation to optimize efficacy of depression prevention.
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Affiliation(s)
- Michael R. Irwin
- Department of Psychiatry and Biobehavioral Sciences, Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Chloe C. Boyle
- Department of Psychiatry and Biobehavioral Sciences, Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Joshua H. Cho
- Department of Psychiatry and Biobehavioral Sciences, Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Dominique Piber
- Department of Psychiatry and Biobehavioral Sciences, Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA, USA
- Department of Psychiatry, Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Berlin, Germany
- Berlin Institute of Health (BIH), Berlin, Germany
| | - Elizabeth C. Breen
- Department of Psychiatry and Biobehavioral Sciences, Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Nina Sadeghi
- Department of Psychiatry and Biobehavioral Sciences, Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Daisy Castillo
- Department of Psychiatry and Biobehavioral Sciences, Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Michael Smith
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University, School of Medicine, Baltimore, MD, USA
| | - Naomi I. Eisenberger
- Department of Psychology, College of Arts and Sciences, UCLA, Los Angeles, CA, USA
| | - Richard Olmstead
- Department of Psychiatry and Biobehavioral Sciences, Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA, USA
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Helman TJ, Headrick JP, Stapelberg NJC, Braidy N. The sex-dependent response to psychosocial stress and ischaemic heart disease. Front Cardiovasc Med 2023; 10:1072042. [PMID: 37153459 PMCID: PMC10160413 DOI: 10.3389/fcvm.2023.1072042] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 04/03/2023] [Indexed: 05/09/2023] Open
Abstract
Stress is an important risk factor for modern chronic diseases, with distinct influences in males and females. The sex specificity of the mammalian stress response contributes to the sex-dependent development and impacts of coronary artery disease (CAD). Compared to men, women appear to have greater susceptibility to chronic forms of psychosocial stress, extending beyond an increased incidence of mood disorders to include a 2- to 4-fold higher risk of stress-dependent myocardial infarction in women, and up to 10-fold higher risk of Takotsubo syndrome-a stress-dependent coronary-myocardial disorder most prevalent in post-menopausal women. Sex differences arise at all levels of the stress response: from initial perception of stress to behavioural, cognitive, and affective responses and longer-term disease outcomes. These fundamental differences involve interactions between chromosomal and gonadal determinants, (mal)adaptive epigenetic modulation across the lifespan (particularly in early life), and the extrinsic influences of socio-cultural, economic, and environmental factors. Pre-clinical investigations of biological mechanisms support distinct early life programming and a heightened corticolimbic-noradrenaline-neuroinflammatory reactivity in females vs. males, among implicated determinants of the chronic stress response. Unravelling the intrinsic molecular, cellular and systems biological basis of these differences, and their interactions with external lifestyle/socio-cultural determinants, can guide preventative and therapeutic strategies to better target coronary heart disease in a tailored sex-specific manner.
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Affiliation(s)
- Tessa J. Helman
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales, NSW, Sydney, Australia
- Correspondence: Tessa J. Helman
| | - John P. Headrick
- Schoolof Pharmacy and Medical Sciences, Griffith University, Southport, QLD, Australia
| | | | - Nady Braidy
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales, NSW, Sydney, Australia
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Baek SH, Kim H, Kim JW, Ryu S, Lee JY, Kim JM, Shin IS, Kim SW. Association between Peripheral Inflammatory Cytokines and Cognitive Function in Patients with First-Episode Schizophrenia. J Pers Med 2022; 12:jpm12071137. [PMID: 35887634 PMCID: PMC9317024 DOI: 10.3390/jpm12071137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Revised: 07/07/2022] [Accepted: 07/10/2022] [Indexed: 11/25/2022] Open
Abstract
In this study, we investigated the impact of inflammatory cytokines on the cognitive performance of patients with schizophrenia. The included patients met the criteria for schizophrenia spectrum disorder and were aged between 15 and 40 years, with a duration of illness ≤1 year. Plasma tumor necrosis factor (TNF)-α; interferon-γ; and interleukin (IL)-1β, IL-6, IL-8, IL-10, and IL-12 levels were measured. A computerized neurocognitive battery, measures for social cognitive function, and clinical measures were administered. A total of 174 patients with first-episode psychosis were enrolled. The TNF-α level was negatively correlated with scores on the digit span, verbal learning, and Wisconsin card sorting tests, and the number of correct responses on the continuous performance test (CR-CPT), whereas a positive correlation was detected with the trail making test (TMT)-B time. The interferon-γ level was negatively correlated with performance on the false belief and visual learning tests. The IL-1β level was positively correlated with the TMT-A time and CPT reaction time, whereas it was negatively correlated with the CR-CPT and performance on the visual learning and social cognitive tests. The IL-12 level was negatively correlated with the CR-CPT and false belief test. Our results suggest that proinflammatory cytokines are associated with cognitive impairment in patients with schizophrenia.
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Affiliation(s)
- Seon-Hwa Baek
- Department of Psychiatry, Chonnam National University Medical School, Gwangju 61419, Korea; (S.-H.B.); (H.K.); (J.-W.K.); (S.R.); (J.-Y.L.); (J.-M.K.); (I.-S.S.)
| | - Honey Kim
- Department of Psychiatry, Chonnam National University Medical School, Gwangju 61419, Korea; (S.-H.B.); (H.K.); (J.-W.K.); (S.R.); (J.-Y.L.); (J.-M.K.); (I.-S.S.)
| | - Ju-Wan Kim
- Department of Psychiatry, Chonnam National University Medical School, Gwangju 61419, Korea; (S.-H.B.); (H.K.); (J.-W.K.); (S.R.); (J.-Y.L.); (J.-M.K.); (I.-S.S.)
| | - Seunghyong Ryu
- Department of Psychiatry, Chonnam National University Medical School, Gwangju 61419, Korea; (S.-H.B.); (H.K.); (J.-W.K.); (S.R.); (J.-Y.L.); (J.-M.K.); (I.-S.S.)
| | - Ju-Yeon Lee
- Department of Psychiatry, Chonnam National University Medical School, Gwangju 61419, Korea; (S.-H.B.); (H.K.); (J.-W.K.); (S.R.); (J.-Y.L.); (J.-M.K.); (I.-S.S.)
| | - Jae-Min Kim
- Department of Psychiatry, Chonnam National University Medical School, Gwangju 61419, Korea; (S.-H.B.); (H.K.); (J.-W.K.); (S.R.); (J.-Y.L.); (J.-M.K.); (I.-S.S.)
| | - Il-Seon Shin
- Department of Psychiatry, Chonnam National University Medical School, Gwangju 61419, Korea; (S.-H.B.); (H.K.); (J.-W.K.); (S.R.); (J.-Y.L.); (J.-M.K.); (I.-S.S.)
| | - Sung-Wan Kim
- Department of Psychiatry, Chonnam National University Medical School, Gwangju 61419, Korea; (S.-H.B.); (H.K.); (J.-W.K.); (S.R.); (J.-Y.L.); (J.-M.K.); (I.-S.S.)
- Mindlink, Gwangju Bukgu Mental Health Center, Gwangju 61220, Korea
- Correspondence: ; Tel.: +82-62-220-6148
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10
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Kim SR, Park Y, Li M, Kim YK, Lee S, Son SY, Lee S, Lee JS, Lee CH, Park HH, Lee JY, Hong S, Cho YC, Kim JW, Yoo HM, Cho N, Lee HS, Lee SH. Anti-inflammatory effect of Ailanthus altissima (Mill.) Swingle leaves in lipopolysaccharide-stimulated astrocytes. JOURNAL OF ETHNOPHARMACOLOGY 2022; 286:114258. [PMID: 34271112 DOI: 10.1016/j.jep.2021.114258] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 05/18/2021] [Accepted: 05/25/2021] [Indexed: 06/13/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Activated astrocytes are involved in the progression of neurodegenerative diseases. Traditionally, Ailanthus altissima (Mill.) Swingle, widely distributed in East Asia, has been used as a medicine for the treatment of fever, gastric diseases, and inflammation. Although A. altissima has been reported to play an anti-inflammatory role in peripheral tissues or cells, its role in the central nervous system (CNS) remains unclear. AIM OF THE STUDY In the present study, we investigated the anti-inflammatory effects and mechanism of action of A. altissima in primary astrocytes stimulated by lipopolysaccharide (LPS). MATERIALS AND METHODS A nitrite assay was used to measure nitric oxide (NO) production, and the tetrazolium salt 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay was performed to determine cytotoxicity. The expression levels of inducible nitric oxide synthase (iNOS), cyclooxygenase-2 (COX-2), and mitogen-activated protein kinase (MAPK) were determined with western blotting. Reverse-transcription PCR was used to assess the expression of inflammatory cytokines. The levels of reactive oxygen species were measured using 2,7-dichlorodihydrofluorescein diacetate. Luciferase assay and immunocytochemistry were used for assessing nuclear factor-kappa B (NF-κB) transcription and p65 localization, respectively. Memory and social interaction were analyzed using the Y-maze and three-chamber tests, respectively. RESULTS The ethanol extract of A. altissima leaves (AAE) inhibited iNOS and COX-2 expression in LPS-stimulated astrocytes. Moreover, AAE reduced the transcription of various proinflammatory mediators, hindered NF-κB activation, and suppressed extracellular signal-regulated kinase (ERK) and c-Jun N-terminal kinase (JNK) activation without p38 activation. Ultra-high performance liquid chromatography with mass spectrometry analysis revealed that AAE comprised ethyl gallate, quercetin, and kaempferol, along with luteolin, which has anti-inflammatory properties, and repressed LPS-induced nitrite levels and the nuclear translocation of p65. Finally, oral administration of AAE attenuated LPS-induced memory and social impairment in mice and repressed LPS-induced ERK and JNK activation in the cortices of mice. CONCLUSION AAE could have therapeutic uses in the treatment of neuroinflammatory diseases via suppression of astrocyte activation.
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Affiliation(s)
- Sung Rae Kim
- Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Yongun Park
- Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Mo Li
- Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Yeong Kyeong Kim
- Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Sunmin Lee
- Department of Bioscience and Biotechnology, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea
| | - Su Young Son
- Department of Bioscience and Biotechnology, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea
| | - Sarah Lee
- National Institute of Biological Resources, Environmental Research Complex, 42 Hwangyeong-ro, Seo-gu, Incheon, 22755, Republic of Korea
| | - Jong Seok Lee
- National Institute of Biological Resources, Environmental Research Complex, 42 Hwangyeong-ro, Seo-gu, Incheon, 22755, Republic of Korea
| | - Choong Hwan Lee
- Department of Bioscience and Biotechnology, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea
| | - Hyun Ho Park
- Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Ji-Yun Lee
- Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Sungguan Hong
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Young-Chang Cho
- College of Pharmacy, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, Republic of Korea
| | - Jung-Woong Kim
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Hee Min Yoo
- Center for Bioanalysis, Korea Research Institute of Standards and Science, Daejeon, 34113, Republic of Korea
| | - Namki Cho
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Hyun-Shik Lee
- KNU-Center for Nonlinear Dynamics, CMRI, BK21 FOUR KNU Creative BioResearch Group, School of Life Sciences, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Sung Hoon Lee
- Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea.
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11
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Parrish MH, Dutcher JM, Muscatell KA, Inagaki TK, Moieni M, Irwin MR, Eisenberger NI. Frontostriatal Functional Connectivity Underlies Self-Enhancement During Social Evaluation. Soc Cogn Affect Neurosci 2022; 17:723-731. [PMID: 34984459 PMCID: PMC9340112 DOI: 10.1093/scan/nsab139] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 10/27/2021] [Accepted: 01/04/2022] [Indexed: 01/07/2023] Open
Abstract
Self-enhancement, the tendency to view oneself positively, is a pervasive social motive widely investigated in the psychological sciences. Relatively little is known about the neurocognitive mechanisms underlying this motive, specifically in social-evaluative situations. To investigate whether positive emotion regulation circuitry, circuitry involved in modulating positive affect, relates to the self-enhancement motive in social contexts, we conducted an functional magnetic resonance imaging (fMRI) study in a healthy young adult sample. We hypothesized that self-enhancement indices (state and trait self-esteem) would relate to greater functional connectivity between right ventrolateral prefrontal cortex (RVLPFC), a region implicated in emotion regulation, and the ventral striatum (VS), a region associated with reward-related affect, during a social feedback task. Following social evaluation, participants experienced stable or decreased state self-esteem. Results showed that stable state self-esteem from pre- to post-scan and higher trait self-esteem related to greater RVLPFC–VS connectivity during positive evaluation. Stable-state self-esteem also related to greater RVLPFC–VS connectivity during negative evaluation. Moreover, RVLPFC activation during all types of feedback processing and left VS activation during negative feedback processing was greater for participants with stable-state self-esteem. These findings implicate neurocognitive mechanisms underlying emotion regulation in the self-enhancement motive and highlight a pathway through which self-enhancement may restore feelings of self-worth during threatening situations.
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Affiliation(s)
- Michael H Parrish
- Department of Psychology, University of California, Los Angeles, USA
| | | | - Keely A Muscatell
- Department of Psychology and Neuroscience, The University of North Carolina at Chapel Hill, USA
| | | | - Mona Moieni
- Department of Psychology, University of California, Los Angeles, USA
| | - Michael R Irwin
- Norman Cousins Center for Psychoneuroimmunology, Semel Institute for Neuroscience and Human Behavior and Department of Psychiatry and Biobehavioral Science, University of California, Los Angeles, USA
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12
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Devlin BA, Smith CJ, Bilbo SD. Sickness and the social brain: How the immune system regulates behavior across species. BRAIN, BEHAVIOR AND EVOLUTION 2021; 97:197-210. [PMID: 34915474 DOI: 10.1159/000521476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 12/10/2021] [Indexed: 11/19/2022]
Abstract
Many instances of sickness critically involve the immune system. The immune system talks to the brain in a bi-directional loop. This discourse affords the immune system immense control, such that it can influence behavior and optimize recovery from illness. These behavioral responses to infection are called sickness behaviors and can manifest in many ways, including changes in mood, motivation, or energy. Fascinatingly, most of these changes are conserved across species, and most organisms demonstrate some form of sickness behaviors. One of the most interesting sickness behaviors, and not immediately obvious, is altered sociability. Here, we discuss how the immune system impacts social behavior, by examining the brain regions and immune mediators involved in this process. We first outline how social behavior changes in response to infection in various species. Next, we explore which brain regions control social behavior and their evolutionary origins. Finally, we describe which immune mediators establish the link between illness and social behavior, in the context of both normal development and infection. Overall, we hope to make clear the striking similarities between the mechanisms that facilitate changes in sociability in derived and ancestral vertebrate, as well as invertebrate, species.
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Affiliation(s)
- Benjamin A Devlin
- Department of Psychology and Neuroscience, Duke University, Durham, North Carolina, USA
| | - Caroline J Smith
- Department of Psychology and Neuroscience, Duke University, Durham, North Carolina, USA
| | - Staci D Bilbo
- Department of Psychology and Neuroscience, Duke University, Durham, North Carolina, USA
- Department of Neurobiology, Duke University, Durham, North Carolina, USA
- Department of Cell Biology, Duke University, Durham, North Carolina, USA
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13
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Inflammation, depressive symptoms, and emotion perception in adolescence. J Affect Disord 2021; 295:717-723. [PMID: 34517245 PMCID: PMC8551069 DOI: 10.1016/j.jad.2021.08.126] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 07/06/2021] [Accepted: 08/29/2021] [Indexed: 12/11/2022]
Abstract
BACKGROUND Individuals with depression often demonstrate an altered peripheral inflammatory profile, as well as emotion perception difficulties. However, correlations of inflammation with overall depression severity are inconsistent and inflammation may only contribute to specific symptoms. Moreover, measurement of the association between inflammation and emotion perception is sparse in adolescence, despite representing a formative window of emotional development and high-risk period for depression onset. METHODS Serum interleukin (IL)-6, tumor necrosis factor (TNF)-α, and IL-1β were measured in 34 adolescents aged 12-17 with DSM-IV depressive disorders (DEP) and 29 healthy controls (HC). Participants were evaluated using the Children's Depression Rating Scale-Revised (CDRS-R) and symptom subscales were extracted based on factor analysis. Participants also completed a performance-based measure of emotion perception, the Facial Emotion Perception Test (FEPT), which assesses the accuracy of categorizing angry, fearful, sad, happy, and neutral facial emotions. RESULTS IL-6 and TNF-α correlated with reported depressed mood and somatic symptoms, respectively, but not total CDRS-R score, anhedonia or observed mood, across both DEP and HC. DEP demonstrated lower accuracy for identifying angry facial expressions. Higher IL-6 was inversely related to accuracy and discrimination of angry and neutral faces across all participants. IL-1β was associated with reduced discrimination of fearful faces. CONCLUSIONS Inflammatory markers were sensitive to affective and somatic symptoms of depression and processing of emotional threat in adolescents. In particular, IL-6 was elevated in depressed adolescents and therefore may represent a specific target for modulating depressive symptoms and emotion processing.
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14
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Fevers and the social costs of acute infection in wild vervet monkeys. Proc Natl Acad Sci U S A 2021; 118:2107881118. [PMID: 34716266 DOI: 10.1073/pnas.2107881118] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 09/15/2021] [Indexed: 12/27/2022] Open
Abstract
Fevers are considered an adaptive response by the host to infection. For gregarious animals, however, fever and the associated sickness behaviors may signal a temporary loss of capacity, offering other group members competitive opportunities. We implanted wild vervet monkeys (Chlorocebus pygerythrus) with miniature data loggers to obtain continuous measurements of core body temperature. We detected 128 fevers in 43 monkeys, totaling 776 fever-days over a 6-year period. Fevers were characterized by a persistent elevation in mean and minimum 24-h body temperature of at least 0.5 °C. Corresponding behavioral data indicated that febrile monkeys spent more time resting and less time feeding, consistent with the known sickness behaviors of lethargy and anorexia, respectively. We found no evidence that fevers influenced the time individuals spent socializing with conspecifics, suggesting social transmission of infection within a group is likely. Notably, febrile monkeys were targeted with twice as much aggression from their conspecifics and were six times more likely to become injured compared to afebrile monkeys. Our results suggest that sickness behavior, together with its agonistic consequences, can carry meaningful costs for highly gregarious mammals. The degree to which social factors modulate the welfare of infected animals is an important aspect to consider when attempting to understand the ecological implications of disease.
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15
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Venta A, Bechelli J, Bick J, Brewer TM, Boisvert D, Wells J, Lewis RH, Armstrong T. Inflammatory and environmental contributions to social information processing. Attach Hum Dev 2021; 24:461-476. [PMID: 34622742 DOI: 10.1080/14616734.2021.1985540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
It appears that social information processing is negatively affected by inflammation, but extant research is primarily experimental and comes from laboratory-based manipulations of inflammatory states. We aimed to examine interactions between inflammation, stressful life events, and positive memories of childhood relations with parents in relation to social information processing in 201 adults. We hypothesized that increased inflammation and stressful life events would be associated with greater hostile social information processing, but that positive memories of childhood relations with parents would moderate both relations. Results indicated that high IL-6 levels and stressful life events were significantly associated with direct and hostile social information processing. Positive memories of childhood relations with parents attenuated the link between stressful life events and social information processing. Findings suggest that both immune function and environmental stressors are related to social information processing and that positive memories of childhood relations exert some buffering effect.
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Affiliation(s)
- Amanda Venta
- Department of Psychology, University of Houston, Houston, TX, USA
| | - Jeremy Bechelli
- Department of Biological Sciences, Sam Houston State University, Huntsville, AL, USA
| | - Johanna Bick
- Department of Psychology, University of Houston, Houston, TX, USA
| | - Trisha M Brewer
- Department of Biological Sciences, Sam Houston State University, Huntsville, AL, USA
| | - Danielle Boisvert
- Department of Criminal Justice and Criminology, Sam Houston State University, Huntsville, AL, USA
| | - Jessica Wells
- Department of Criminal Justice, Boise State University, Boise, ID, USA
| | - Richard H Lewis
- Department of Criminal Justice, University of Arkansas at Little Rock, Little Rock, AR, USA
| | - Todd Armstrong
- School of Criminology and Criminal Justice, University of Nebraska Omaha, Omaha, Nebraska, USA
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16
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Muscatell KA, Inagaki TK. Beyond social withdrawal: New perspectives on the effects of inflammation on social behavior. Brain Behav Immun Health 2021; 16:100302. [PMID: 34589794 PMCID: PMC8474589 DOI: 10.1016/j.bbih.2021.100302] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 07/21/2021] [Accepted: 07/23/2021] [Indexed: 12/30/2022] Open
Abstract
Decades of research in animals and humans show that inflammation is an important regulator of social behavior. While much research in this area has concluded that inflammation causes a withdrawal from social interaction, closer examination of the literature reveals that the effects of inflammation on social behavior are much more nuanced. Indeed, while many studies do show that increases in inflammation lead to social withdrawal, other studies show the exact opposite, finding that inflammation leads to an increase in social approach behavior. Critically, whether an organism withdraws or approaches when inflamed may depend on the whether the target of the behavior is a close other or a stranger. In the present paper, we review both animal research and our initial research in humans that has utilized experimental manipulations of inflammation and examined their effects on social approach behavior. We argue, based on complementary theoretical perspectives and supporting evidence from the literature, that there are three critical next steps for translational work examining the effects of inflammation on social behavior: (1) We need to study actual social behavior, as expressed toward both close others and strangers; (2) We should examine not just the social behavior of the inflamed individual, but also the behavior of others interacting with an inflamed individual; and (3) We must consider the relative increases in inflammation (i.e., higher vs. lower) as a contributor to social withdrawal vs. approach. Ultimately, we urge the field to move beyond a singular focus on inflammation and social withdrawal so that we can develop a more comprehensive understanding of the effects of inflammation on a variety of social behaviors.
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Affiliation(s)
- Keely A. Muscatell
- Department of Psychology & Neuroscience, University of North Carolina at Chapel Hill, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, USA
- Carolina Population Center, University of North Carolina at Chapel Hill, USA
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17
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Turner JA, Padgett C, McDonald S, Ahuja KD, Francis HM, Lim CK, Honan CA. Innate immunity impacts social-cognitive functioning in people with multiple sclerosis and healthy individuals: Implications for IL-1ra and urinary immune markers. Brain Behav Immun Health 2021; 14:100254. [PMID: 34589763 PMCID: PMC8474509 DOI: 10.1016/j.bbih.2021.100254] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 02/26/2021] [Accepted: 03/21/2021] [Indexed: 11/30/2022] Open
Abstract
Social-cognitive difficulties can negatively impact interpersonal communication, shared social experience, and meaningful relationships. This pilot investigation examined the relationship between social-cognitive functioning and inflammatory markers in people with multiple sclerosis (MS) and demographically-matched healthy individuals. Additionally, we compared the immune marker profile in serum and urine-matched samples. Social cognitive functioning was objectively assessed using The Awareness of Social Inference Test - Short (TASIT-S) and subjectively assessed using self-reports of abilities in emotion recognition, emotional empathy, and cognitive theory of mind. In people with MS and healthy individuals, there were moderate-to-large negative relationships between pro-inflammatory biomarkers (serum IL-1β, IL-17, TNF-α, IP-10, MIP-1α, and urine IP-10, MIP-1β) of the innate immune system and social-cognitive functioning. In MS, a higher serum concentration of the anti-inflammatory marker IL-1ra was associated with better social-cognitive functioning (i.e., self-reported emotional empathy and TASIT-S sarcasm detection performance). However, there were mixed findings for anti-inflammatory serum markers IL-4 and IL-10. Overall, our findings indicate a relationship between pro-inflammatory cytokines and social-cognitive abilities. Future studies may provide greater insight into biologically-derived inflammatory processes, sickness behaviour, and their connection with social cognition.
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Affiliation(s)
- Jason A. Turner
- School of Psychological Sciences, College of Health and Medicine, University of Tasmania, Hobart and Launceston, Australia
| | - Christine Padgett
- School of Psychological Sciences, College of Health and Medicine, University of Tasmania, Hobart and Launceston, Australia
| | - Skye McDonald
- School of Psychology, University of New South Wales, Sydney, Australia
| | - Kiran D.K. Ahuja
- School of Health Sciences, University of Tasmania, Launceston, Australia
| | | | - Chai K. Lim
- Department of Biomedical Sciences, Macquarie University, Sydney, Australia
| | - Cynthia A. Honan
- School of Psychological Sciences, College of Health and Medicine, University of Tasmania, Hobart and Launceston, Australia
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18
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Abstract
BACKGROUND Despite adequate antipsychotic treatment, most people with schizophrenia continue to exhibit persistent positive and negative symptoms and cognitive impairments. The current study was designed to examine the efficacy and safety of adjunctive anti-inflammatory combination therapy for these illness manifestations. METHODS Thirty-nine people with either Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision, schizophrenia or schizoaffective disorder were entered into a 12-week double-blind, 2-arm, triple-dummy, placebo-controlled, randomized clinical trial: 19 were randomized to anti-inflammatory combination therapy and 20 were randomized to placebo. The Brief Psychiatric Rating Scale positive symptom item total score was used to assess positive symptom change, the Scale for the Assessment of Negative Symptoms total score was used to assess negative symptom change, the Calgary Depression Scale total score was used to assess depressive symptom change, and the MATRICS Consensus Cognitive Battery was used to assess neuropsychological test performance. RESULTS There was a significant time effect for Brief Psychiatric Rating Scale positive symptom item score (t226 = -2.66, P = 0.008), but the treatment (t54=1.52, P = 0.13) and treatment × time (t223 = 0.47, P = 0.64) effects were not significant. There were no significant time (t144 = 0.53, P = 0.72), treatment (t58=0.48, P = 0.63), or treatment × time (t143 = -0.20, P = 0.84) effects for the Scale for the Assessment of Negative Symptoms total score; or for any of the other symptom measures. There were no significant group differences in the change in the MATRICS Consensus Cognitive Battery composite score over the course of the study (F1,26=2.20, P = 0.15). CONCLUSIONS The study results suggest that there is no significant benefit of combined anti-inflammatory treatment for persistent positive symptoms or negative symptoms or cognitive impairments (clinicaltrials.gov trial number: NCT01514682).
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19
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Barcik W, Chiacchierini G, Bimpisidis Z, Papaleo F. Immunology and microbiology: how do they affect social cognition and emotion recognition? Curr Opin Immunol 2021; 71:46-54. [PMID: 34058687 DOI: 10.1016/j.coi.2021.05.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 05/01/2021] [Indexed: 12/25/2022]
Abstract
Social interactions profoundly influence animals' life. The quality of social interactions and many everyday life decisions are determined by a proper perception, processing and reaction to others' emotions. Notably, alterations in these social processes characterize a number of neurodevelopmental disorders, including autism spectrum disorders and schizophrenia. Increasing evidences support an implication of immune system vulnerability and inflammatory processes in disparate behavioral functions and the aforementioned neurodevelopmental disorders. In this review, we show a possible unifying view on how immune responses, within and outside the brain, and the communication between the immune system and brain responses might influence emotion recognition and related social responses. In particular, we highlight the importance of combining genetics, immunology and microbiology factors in understanding social behaviors. We underline the importance of better disentangling the whole machinery between brain-immune system interactions to better address the complexity of social processes.
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Affiliation(s)
- Weronika Barcik
- Genetics of Cognition Laboratory, Neuroscience Area, Istituto Italiano di Tecnologia, Genova, Italy
| | - Giulia Chiacchierini
- Genetics of Cognition Laboratory, Neuroscience Area, Istituto Italiano di Tecnologia, Genova, Italy
| | - Zisis Bimpisidis
- Genetics of Cognition Laboratory, Neuroscience Area, Istituto Italiano di Tecnologia, Genova, Italy
| | - Francesco Papaleo
- Genetics of Cognition Laboratory, Neuroscience Area, Istituto Italiano di Tecnologia, Genova, Italy; Fondazione IRCCS Ca'Granda Ospedale Maggiore Policlinico, Milano, Italy.
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20
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Balter LJ, Raymond JE, Aldred S, Higgs S, Bosch JA. Age, BMI, and inflammation: Associations with emotion recognition. Physiol Behav 2021; 232:113324. [PMID: 33482194 DOI: 10.1016/j.physbeh.2021.113324] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 01/08/2021] [Accepted: 01/18/2021] [Indexed: 11/18/2022]
Abstract
Experimental studies show that inflammation impairs the ability to interpret the mental state of another person, denoted theory of mind (ToM). The current study attempted a conceptual replication in states associated with elevated low-grade inflammation, i.e., high body weight and advanced age. Ninety young (M = 26.3 years, SD = 4.1) or older (M = 70.7 years, SD = 4.0) participants with either a normal body mass index (BMI) (M = 22.4, SD = 2.2) or high BMI (M = 33.1, SD = 3.8) completed the Reading the Mind in the Eyes Test (RMET) to assess emotion recognition. Plasma interleukin-6 (IL-6) level was measured to index low-grade inflammation. As anticipated, elevated IL-6 levels were found with higher BMI, although not with increased age. IL-6 was associated with poorer task performance, independent of potential demographic and health confounders (e.g., sex, education, smoking status, alcohol intake, presence of medical conditions, and medication intake). Analyses also revealed an interaction whereby young individuals with a high BMI showed worse RMET performance compared to their normal BMI counterparts, whereas the opposite pattern was found in older individuals. The present observational study replicated experimental results showing that elevated low-grade inflammation is correlated with a lower ability to infer the mental states of others. These findings suggest that also naturalistic conditions of (protracted) low-grade inflammation may alter emotion recognition.
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Affiliation(s)
- Leonie Jt Balter
- Stress Research Institute, Stockholm University, Stockholm, SE-10691.
| | - Jane E Raymond
- School of Psychology, University of Birmingham, Birmingham, B15 2TT, UK
| | - Sarah Aldred
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, B15 2TT, UK
| | - Suzanne Higgs
- School of Psychology, University of Birmingham, Birmingham, B15 2TT, UK
| | - Jos A Bosch
- Psychology Department, Clinical Psychology, University of Amsterdam, Amsterdam, 1018 WT, NL
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21
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A biological framework for emotional dysregulation in alcohol misuse: from gut to brain. Mol Psychiatry 2021; 26:1098-1118. [PMID: 33288871 DOI: 10.1038/s41380-020-00970-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 10/21/2020] [Accepted: 11/20/2020] [Indexed: 02/08/2023]
Abstract
Alcohol use disorder (AUD) has been associated with impairments in social and emotional cognition that play a crucial role in the development and maintenance of addiction. Repeated alcohol intoxications trigger inflammatory processes and sensitise the immune system. In addition, emerging data point to perturbations in the gut microbiome as a key regulator of the inflammatory cascade in AUD. Inflammation and social cognition are potent modulators of one another. At the same time, accumulating evidence implicates the gut microbiome in shaping emotional and social cognition, suggesting the possibility of a common underlying loop of crucial importance for addiction. Here we propose an integrative microbiome neuro-immuno-affective framework of how emotional dysregulation and alcohol-related microbiome dysbiosis could accelerate the cycle of addiction. We outline the overlapping effects of chronic alcohol use, inflammation and microbiome alterations on the fronto-limbic circuitry as a convergence hub for emotional dysregulation. We discuss the interdependent relationship of social cognition, immunity and the microbiome in relation to alcohol misuse- from binge drinking to addiction. In addition, we emphasise adolescence as a sensitive period for the confluence of alcohol harmful effects and emotional dysregulation in the developing gut-brain axis.
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22
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Quidé Y, Bortolasci CC, Spolding B, Kidnapillai S, Watkeys OJ, Cohen-Woods S, Carr VJ, Berk M, Walder K, Green MJ. Systemic inflammation and grey matter volume in schizophrenia and bipolar disorder: Moderation by childhood trauma severity. Prog Neuropsychopharmacol Biol Psychiatry 2021; 105:110013. [PMID: 32540496 DOI: 10.1016/j.pnpbp.2020.110013] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 05/28/2020] [Accepted: 06/09/2020] [Indexed: 12/20/2022]
Abstract
BACKGROUND Elevated levels of systemic inflammation are consistently reported in both schizophrenia (SZ) and bipolar-I disorder (BD), and are associated with childhood trauma exposure. We tested whether childhood trauma exposure moderates associations between systemic inflammation and brain morphology in people with these diagnoses. METHODS Participants were 55 SZ cases, 52 BD cases and 59 healthy controls (HC) who underwent magnetic resonance imaging. Systemic inflammation was measured using a composite z-score derived from serum concentrations of interleukin 6, tumor necrosis factor alpha and C-reactive protein. Indices of grey matter volume covariation (GMC) were derived from independent component analysis. Childhood trauma was measured using the Childhood Trauma Questionnaire (CTQ Total score). RESULTS A series of moderated moderation analyses indicated that increased systemic inflammation were associated with increased GMC in the striatum and cerebellum among all participants. Severity of childhood trauma exposure moderated the relationship between systemic inflammation and GMC in one component, differently among the groups. Specifically, decreased GMC in the PCC/precuneus, parietal lobule and postcentral gyrus, and increased GMC in the left middle temporal gyrus was associated with increased systemic inflammation in HC individuals exposed to high (but not low or average) levels of trauma and in SZ cases exposed to low (but not average or high) levels of trauma, but not in BD cases. CONCLUSIONS Increased systemic inflammation is associated with grey matter changes in people with psychosis, and these relationships may be partially and differentially moderated by childhood trauma exposure according to diagnosis.
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Affiliation(s)
- Yann Quidé
- School of Psychiatry, University of New South Wales (UNSW), Sydney, NSW, Australia; Neuroscience Research Australia, Randwick, NSW, Australia.
| | - Chiara C Bortolasci
- Centre for Molecular and Medical Research, School of Medicine, Deakin University, Geelong, VIC, Australia
| | - Briana Spolding
- Centre for Molecular and Medical Research, School of Medicine, Deakin University, Geelong, VIC, Australia
| | - Srisaiyini Kidnapillai
- Centre for Molecular and Medical Research, School of Medicine, Deakin University, Geelong, VIC, Australia
| | - Oliver J Watkeys
- School of Psychiatry, University of New South Wales (UNSW), Sydney, NSW, Australia; Neuroscience Research Australia, Randwick, NSW, Australia
| | - Sarah Cohen-Woods
- Discipline of Psychology, Flinders University, Adelaide, SA, Australia; Flinders Centre for Innovation in Cancer, Adelaide, SA, Australia; Órama Institute, College of Education, Psychology, and Social Work, Flinders University, Adelaide, SA, Australia
| | - Vaughan J Carr
- School of Psychiatry, University of New South Wales (UNSW), Sydney, NSW, Australia; Neuroscience Research Australia, Randwick, NSW, Australia; Department of Psychiatry, School of Clinical Sciences, Monash University, Clayton, VIC, Australia
| | - Michael Berk
- Centre for Molecular and Medical Research, School of Medicine, Deakin University, Geelong, VIC, Australia; Deakin University, IMPACT, the Institute for Mental and Physical Health and Clinical Translation, Barwon Health, Geelong, VIC, Australia; Florey Institute for Neuroscience and Mental Health, Parkville, VIC, Australia; Orygen, The National Centre of Excellence in Youth Mental Health, Parkville, VIC, Australia; Department of Psychiatry, University of Melbourne, Parkville, VIC, Australia
| | - Ken Walder
- Centre for Molecular and Medical Research, School of Medicine, Deakin University, Geelong, VIC, Australia; Deakin University, IMPACT, the Institute for Mental and Physical Health and Clinical Translation, Barwon Health, Geelong, VIC, Australia
| | - Melissa J Green
- School of Psychiatry, University of New South Wales (UNSW), Sydney, NSW, Australia; Neuroscience Research Australia, Randwick, NSW, Australia
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Sleep, inflammation, and perception of sad facial emotion: A laboratory-based study in older adults. Brain Behav Immun 2020; 89:159-167. [PMID: 32531429 DOI: 10.1016/j.bbi.2020.06.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 06/06/2020] [Accepted: 06/06/2020] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Facial emotion perception (FEP) is pivotal for discriminating salient emotional information. Accumulating data indicate that FEP responses, particularly to sad emotional stimuli, are impaired in depression. This study tests whether sleep disturbance and inflammation, two risk factors for depression, contribute to impaired FEP to sad emotional stimuli. METHODS In older adults (n = 40, 71.7 ± 6.8y, 56.4% female), disturbance of sleep maintenance (i.e., wake time after sleep onset [WASO]) was evaluated by polysomnography. In the morning, plasma concentrations of two markers of systemic inflammation were evaluated (i.e., interleukin [IL]-6, tumor necrosis factor [TNF]-α), followed by two FEP tasks, which assessed delays in emotion recognition (ER) and ratings of perceived emotion intensity (EI) in response to sad facial emotional stimuli, with exploration of FEP responses to happiness and anger. Linear regression models tested whether WASO, IL-6, and TNF-α would be associated with impaired FEP to sad emotional stimuli. In addition, moderation tests examined whether inflammation would moderate the link between sleep disturbance and impaired FEP to sad emotional stimuli. RESULTS Longer WASO predicted longer ER delays (p < 0.05) and lower EI ratings in response to sad faces (p < 0.01). Further, higher TNF-α (p < 0.05) but not IL-6 predicted longer ER delays for sad faces, whereas higher IL-6 (p < 0.01) but not TNF-α predicted lower EI ratings for sad faces. Finally, TNF-α moderated the relationship between longer WASO and longer ER delays to sad faces (p < 0.001), while IL-6 moderated the relationship between longer WASO and lower EI ratings to sad faces (p < 0.01). Neither sleep nor inflammatory measures were associated with FEP responses to happiness or anger. CONCLUSION In older adults, disturbance of sleep maintenance is associated with impaired FEP to sad emotion, a relationship that appears to be moderated by inflammation. These data indicate that sleep disturbance and inflammation converge and contribute to impaired FEP with implications for risk for late-life depression.
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Quadt L, Esposito G, Critchley HD, Garfinkel SN. Brain-body interactions underlying the association of loneliness with mental and physical health. Neurosci Biobehav Rev 2020; 116:283-300. [DOI: 10.1016/j.neubiorev.2020.06.015] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 05/31/2020] [Accepted: 06/10/2020] [Indexed: 12/14/2022]
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Lasselin J, Benson S, Hebebrand J, Boy K, Weskamp V, Handke A, Hasenberg T, Remy M, Föcker M, Unteroberdörster M, Brinkhoff A, Engler H, Schedlowski M. Immunological and behavioral responses to in vivo lipopolysaccharide administration in young and healthy obese and normal-weight humans. Brain Behav Immun 2020; 88:283-293. [PMID: 32485294 DOI: 10.1016/j.bbi.2020.05.071] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Revised: 05/25/2020] [Accepted: 05/26/2020] [Indexed: 12/14/2022] Open
Abstract
Obesity is associated with an increase prevalence of neuropsychiatric symptoms and diseases, such as depression. Based on the facts that pro-inflammatory cytokines are able to modulate behavior, and that obesity is characterized by a chronic low-grade inflammatory state, inflammation has been hypothesized to contribute to the neuropsychiatric comorbidity in obese individuals. However, a causal link between inflammation and the development of neuropsychiatric symptoms is hard to establish in humans. Here, we used an inflammatory stimulus, i.e. the intravenous injection of lipopolysaccharide (LPS), in a double-blind placebo-controlled design, to determine the vulnerability of obese individuals to inflammation-induced behavioral changes. The hypothesis was that obese individuals would show heightened behavioral response compared to normal-weight subjects for the same inflammatory stimulus, reflecting an increased sensitivity to the behavioral effects of pro-inflammatory cytokines. LPS (dose 0.8 ng/kg body weight, adjusted for estimated blood volume in obese subjects) and placebo (saline) were intravenously injected in 14 obese healthy subjects and 23 normal-weight healthy subjects in a within-subject, randomized, crossover design. LPS administration induced, in both groups, an acute increase in blood concentrations of cytokines (interleukin-6, tumor necrosis factor-α, and IL-10), as well as in body temperature, cortisol, norepinephrine, sickness symptoms, fatigue, negative mood, and state anxiety. There were little differences in the immune and behavioral responses to LPS between obese and normal-weight subjects, but the cortisol response to LPS was strongly attenuated in obese individuals. Higher percentage of body fat was related to a lower cortisol response to LPS. Taken together, the population of young and healthy obese individuals in this study did not exhibit an increased behavioral sensitivity to cytokines, but an attenuated cortisol response to the immune challenge. Future studies will need to determine whether additional physiological and psychological factors interact with the state of obesity to increase the risk for inflammation-induced neuropsychiatric symptoms.
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Affiliation(s)
- Julie Lasselin
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany; Stress Research Institute, Stockholm University, 10691 Stockholm, Sweden; Department of Clinical Neuroscience, Division for Psychology, Karolinska Institutet, Nobels väg 9, 17177 Stockholm, Sweden.
| | - Sven Benson
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany
| | - Johannes Hebebrand
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, University of Duisburg-Essen, Germany
| | - Karoline Boy
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany
| | - Vera Weskamp
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany
| | - Analena Handke
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany
| | - Till Hasenberg
- Helios Adipositas Zentrum West, Helios St. Elisabeth Klinik Oberhausen, Witten/Herdecke University, Josefstr. 3, 46045 Oberhausen, Germany
| | - Miriam Remy
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, University of Duisburg-Essen, Germany
| | - Manuel Föcker
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, University of Duisburg-Essen, Germany
| | - Meike Unteroberdörster
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany; Department of Neurosurgery, University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany
| | - Alexandra Brinkhoff
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany; Department of Nephrology, University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany
| | - Harald Engler
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany
| | - Manfred Schedlowski
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany
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Uthaug MV, Lancelotta R, Szabo A, Davis AK, Riba J, Ramaekers JG. Prospective examination of synthetic 5-methoxy-N,N-dimethyltryptamine inhalation: effects on salivary IL-6, cortisol levels, affect, and non-judgment. Psychopharmacology (Berl) 2020; 237:773-785. [PMID: 31822925 PMCID: PMC7036074 DOI: 10.1007/s00213-019-05414-w] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 11/25/2019] [Indexed: 12/18/2022]
Abstract
RATIONALE 5-methoxy-N,N-dimethyltryptamine is a psychotropic substance found in various plant and animal species and is synthetically produced. 5-methoxy-N,N-dimethyltryptamine is used in naturalistic settings for spiritual exploration, recreation, or to address negative affect and mood problems. However, scientific knowledge on the effects of 5-methoxy-N,N-dimethyltryptamine in humans is scarce. OBJECTIVES The first objective was to assess the effects of inhalation of vaporized synthetic 5-methoxy-N,N-dimethyltryptamine on neuroendocrine markers. The second objective was to assess effects of the substance on affect and mindfulness. In addition, we assessed whether ratings of subjective measures were associated with changes in stress biomarkers (i.e., cortisol) and immune response (i.e., IL-6, CRP, IL-1β), as well as the acute psychedelic experience. METHODS Assessments (baseline, immediately post-session, and 7-day follow-up) were made in 11 participants. Salivary samples were collected at baseline and post-session and analyzed by high-sensitivity enzyme-linked immunosorbent assay (ELISA). RESULTS 5-methoxy-N,N-dimethyltryptamine significantly increased cortisol levels and decreased IL-6 concentrations in saliva immediately post-session. These changes were not correlated to ratings of mental health or the psychedelic experience. Relative to baseline, ratings of non-judgment significantly increased, and ratings of depression decreased immediately post-session and at follow-up. Ratings of anxiety and stress decreased from baseline to 7-day follow-up. Participant ratings of the psychedelic experience correlated negatively with ratings of affect and positively with ratings of non-judgment. CONCLUSION Inhalation of vaporized synthetic 5-methoxy-N,N-dimethyltryptamine produced significant changes in inflammatory markers, improved affect, and non-judgment in volunteers. Future research should examine the effect of 5-methoxy-N,N-dimethyltryptamineamine with healthy volunteers in a controlled laboratory setting.
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Affiliation(s)
- Malin V Uthaug
- Department of Neuropsychology and Psychopharmacology, Faculty of Psychology and Neuroscience, Maastricht University, Universiteitssingel 40, Maastricht, 6229 ER, The Netherlands.
| | | | - Attila Szabo
- NORMENT, Institute of Clinical Medicine, University of Oslo, Norway; Division of Mental Health and Addiction, Oslo University Hospital, Oslo, Norway
| | - Alan K Davis
- College of Social Work, The Ohio State University, Columbus, OH, 43210, USA
- Center for Psychedelic and Consciousness Research, Department of Psychiatry and Behavioral Sciences, Johns Hopkins University, Baltimore, MD, 21224, USA
| | - Jordi Riba
- Department of Neuropsychology and Psychopharmacology, Faculty of Psychology and Neuroscience, Maastricht University, Universiteitssingel 40, Maastricht, 6229 ER, The Netherlands
| | - Johannes G Ramaekers
- Department of Neuropsychology and Psychopharmacology, Faculty of Psychology and Neuroscience, Maastricht University, Universiteitssingel 40, Maastricht, 6229 ER, The Netherlands.
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Inflammation (IL-1β) Modifies the Effect of Vitamin D and Omega-3 Long Chain Polyunsaturated Fatty Acids on Core Symptoms of Autism Spectrum Disorder-An Exploratory Pilot Study ‡. Nutrients 2020; 12:nu12030661. [PMID: 32121236 PMCID: PMC7146497 DOI: 10.3390/nu12030661] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 02/26/2020] [Accepted: 02/27/2020] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND The role of vitamin D and omega-3 long chain polyunsaturated fatty acids (omega-3 LCPUFA) in improving core symptoms of autism spectrum disorder (ASD) in children has been investigated by a few randomised controlled trials and the results are mixed and inconclusive. The response to treatment with these nutrients is heterogenous and may be influenced by inflammatory state. As an exploratory analysis, we investigated whether inflammatory state would modulate the effect of these nutrients on core symptoms of ASD. Methods: Seventy-three New Zealand children with ASD (2.5-8.0 years) completed a 12-month randomised, double-blind, placebo-controlled trial of vitamin D (VID, 2000 IU/day), omega-3 LCPUFA; (OM, 722 mg/day docosahexaenoic acid), or both (VIDOM). Non-fasting baseline plasma interleukin-1β (IL-1β) was available for 67 children (VID = 15, OM = 21, VIDOM = 15, placebo = 16). Children were categorised as having undetectable/normal IL-1β (<3.2 pg/ml, n=15) or elevated IL-1β (≥3.2 pg/mL, n = 52). The Social Responsiveness Scale (SRS) questionnaire was used to assess core symptoms of ASD (baseline, 12-month). Mixed model repeated measure analyses (including all children or only children with elevated IL-1β) were used. RESULTS We found evidence for an interaction between baseline IL-1β and treatment response for SRS-total, SRS-social communicative functioning, SRS-awareness and SRS-communication (all Pinteraction < 0.10). When all children were included in the analysis, two outcome comparisons (treatments vs. placebo) showed greater improvements: VID, no effect (all P > 0.10); OM and VIDOM (P = 0.01) for SRS-awareness. When only children with elevated IL-1β were included, five outcomes showed greater improvements: OM (P = 0.01) for SRS-total; OM (P = 0.03) for SRS-social communicative functioning; VID (P = 0.01), OM (P = 0.003) and VIDOM (P = 0.01) for SRS-awareness. CONCLUSION Inflammatory state may have modulated responses to vitamin D and omega-3 LCPUFA intervention in children with ASD, suggesting children with elevated inflammation may benefit more from daily vitamin D and omega-3 LCPUFA supplementation.
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Balter LJT, Raymond JE, Aldred S, Drayson MT, Veldhuijzen van Zanten JJCS, Higgs S, Bosch JA. Loneliness in healthy young adults predicts inflammatory responsiveness to a mild immune challenge in vivo. Brain Behav Immun 2019; 82:298-301. [PMID: 31476413 DOI: 10.1016/j.bbi.2019.08.196] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 08/29/2019] [Accepted: 08/29/2019] [Indexed: 01/08/2023] Open
Abstract
The established link between loneliness and poor health outcomes may stem from aberrant inflammatory regulation. The present study tested whether loneliness predicted the inflammatory response to a standardised in vivo immune challenge. Using a within-subjects double blind placebo-controlled design, 40 healthy men (mean age = 25, SD = 5) received a Salmonella Typhi vaccination (0.025 mg; Typhim Vi, Sanofi Pasteur, UK) and placebo (saline) on two separate occasions. Loneliness was assessed using the R-UCLA loneliness scale. Regression analyses showed that those that reported feeling more lonely exhibited an elevated interleukin-6 response (β = 0.564, 95% confidence interval [0.003, 0.042], p < .05). This association withstood adjustment for potentially confounding variables, including age, sleep quality, socio-emotional factors, and health factors. The present findings are in line with evidence that loneliness may shift immune system responsivity, suggesting a potential biobehavioural pathway linking loneliness to impaired health.
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Affiliation(s)
- Leonie J T Balter
- School of Psychology, University of Birmingham, Birmingham B15 2TT, UK; Psychology Department, Clinical Psychology, University of Amsterdam, Amsterdam 1018 WT, the Netherlands.
| | - Jane E Raymond
- School of Psychology, University of Birmingham, Birmingham B15 2TT, UK
| | - Sarah Aldred
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham B15 2TT, UK
| | - Mark T Drayson
- Institute of Immunity and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
| | | | - Suzanne Higgs
- School of Psychology, University of Birmingham, Birmingham B15 2TT, UK
| | - Jos A Bosch
- Psychology Department, Clinical Psychology, University of Amsterdam, Amsterdam 1018 WT, the Netherlands
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Moieni M, Muscatell KA, Jevtic I, Breen EC, Irwin MR, Eisenberger NI. Sex Differences in the Effect of Inflammation on Subjective Social Status: A Randomized Controlled Trial of Endotoxin in Healthy Young Adults. Front Psychol 2019; 10:2167. [PMID: 31632316 PMCID: PMC6781934 DOI: 10.3389/fpsyg.2019.02167] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 09/09/2019] [Indexed: 12/13/2022] Open
Abstract
It has been established that inflammation leads to a variety of changes in social experience, but one area of social experience that has been overlooked is subjective social status. Furthermore, given sex differences in the relationship between inflammation and social status, males may be more sensitive to inflammation-induced changes in social status. However, no previous studies in humans have examined this possibility. In the present study, healthy young participants (n = 115) were randomly assigned to receive either endotoxin, an experimental inflammatory challenge, or placebo. Participants reported their subjective social status at baseline (prior to injection), and approximately 2 h later (time of peak inflammatory response for the endotoxin group). Results, using ANCOVA analyses, indicated that males exposed to endotoxin, but not females, reported lower levels of subjective social status at the peak of inflammatory response (vs. placebo). These results suggest that males may be more sensitive to the effects of inflammation in certain social domains, such as perceived social status. Clinical Trial Registration: www.ClinicalTrials.gov, identifier NCT01671150.
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Affiliation(s)
- Mona Moieni
- Department of Psychology, University of California, Los Angeles, Los Angeles, CA, United States
- Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Keely A. Muscatell
- Department of Psychology and Neuroscience, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
- UNC Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Ivana Jevtic
- Department of Psychology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Elizabeth C. Breen
- Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Michael R. Irwin
- Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles, CA, United States
| | - Naomi I. Eisenberger
- Department of Psychology, University of California, Los Angeles, Los Angeles, CA, United States
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Leschak CJ, Eisenberger NI. Two Distinct Immune Pathways Linking Social Relationships With Health: Inflammatory and Antiviral Processes. Psychosom Med 2019; 81:711-719. [PMID: 31600173 PMCID: PMC7025456 DOI: 10.1097/psy.0000000000000685] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE Social relationships can both influence and be influenced by immune processes. Past work implicates two distinct pathways along which this interaction may occur: inflammatory processes and antiviral processes. This article reviews how social behavior is modulated by these two immune processes and how such processes may in turn regulate social behavior. METHODS This narrative review outlines existing work on social behavior and both inflammatory and antiviral processes. We propose an evolutionary framework that aims to integrate these findings. Specifically, social isolation has evolutionarily increased the likelihood of wounding and therefore increased the need for inflammation, which works to promote healing. Conversely, broader social networks provide protection from physical threats but also lead to increased pathogen exposure, necessitating a more robust antiviral response. RESULTS This review highlights that social adversity, such as social exclusion or loneliness, is associated with increased inflammation, whereas social contact is associated with increased antiviral immunity. Furthermore, increased inflammation leads to sensitivity to social stimuli, presumably to avoid hostile conspecifics and approach allies who may provide care while vulnerable. Individuals with inadequate antiviral immunity engage in behaviors that minimize pathogen exposure, such as reduced affiliative behavior. CONCLUSIONS This review suggests that adverse social experiences (social isolation, perceived social threat) may induce inflammatory responses while suppressing antiviral immunity, whereas positive experiences of social connection may reduce inflammation and bolster antiviral responses. Although acutely elevated inflammation would be adaptive under conditions where wounding is likely, chronic inflammation related to continued social adversity may have detrimental health consequences.
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Affiliation(s)
- Carrianne J Leschak
- From the Department of Psychology, University of California Los Angeles, Los Angeles, California
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Metabolic Endotoxemia: A Potential Underlying Mechanism of the Relationship between Dietary Fat Intake and Risk for Cognitive Impairments in Humans? Nutrients 2019; 11:nu11081887. [PMID: 31412673 PMCID: PMC6722750 DOI: 10.3390/nu11081887] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 07/17/2019] [Accepted: 08/09/2019] [Indexed: 12/13/2022] Open
Abstract
(1) Background: Nutrition is a major lifestyle factor that can prevent the risk of cognitive impairment and dementia. Diet-induced metabolic endotoxemia has been proposed as a major root cause of inflammation and these pathways emerge as detrimental factors of healthy ageing. The aim of this paper was to update research focusing on the relationship between a fat-rich diet and endotoxemia, and to discuss the potential role of endotoxemia in cognitive performances. (2) Methods: We conducted a non-systematic literature review based on the PubMed database related to fat-rich meals, metabolic endotoxemia and cognitive disorders including dementia in humans. A total of 40 articles out of 942 in the first screening met the inclusion criteria. (3) Results: Evidence suggested that a fat-rich diet, depending on its quality, quantity and concomitant healthy food components, could influence metabolic endotoxemia. Since only heterogeneous cross-sectional studies are available, it remains unclear to what extent endotoxemia could be associated or not with cognitive disorders and dementia. (4) Conclusions: A fat-rich diet has the capability to provide significant increases in circulating endotoxins, which highlights nutritional strategies as a promising area for future research on inflammatory-associated diseases. The role of endotoxemia in cognitive disorders and dementia remains unclear and deserves further investigation.
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Moieni M, Tan KM, Inagaki TK, Muscatell KA, Dutcher JM, Jevtic I, Breen EC, Irwin MR, Eisenberger NI. Sex Differences in the Relationship Between Inflammation and Reward Sensitivity: A Randomized Controlled Trial of Endotoxin. BIOLOGICAL PSYCHIATRY. COGNITIVE NEUROSCIENCE AND NEUROIMAGING 2019; 4:619-626. [PMID: 31103547 PMCID: PMC6612452 DOI: 10.1016/j.bpsc.2019.03.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Accepted: 03/22/2019] [Indexed: 12/12/2022]
Abstract
BACKGROUND There are robust sex differences in the prevalence of depression. Inflammation and anhedonia may play a role in understanding these sex differences. Indeed, sex differences in inflammation-induced neural responses to reward may provide insight into the sex gaps in depression, but no study has examined this question. METHODS As such, the current study examined whether there were sex differences in reward-related neural activity (i.e., ventral striatum [VS] activity) in response to an experimental inflammatory challenge. Human participants (N = 115; 69 female) were randomly assigned to receive either placebo or low-dose endotoxin, which increases inflammation in a safe, time-limited manner. Two hours after receiving placebo or endotoxin (the height of the inflammatory response to endotoxin), participants completed a task in which they anticipated monetary reward in a functional magnetic resonance imaging scanner. RESULTS Results demonstrated that endotoxin (vs. placebo) led to reduced VS activity in anticipation of reward and that there were sex differences in this effect. Specifically, in female participants, endotoxin (vs. placebo) led to decreased VS activity in anticipation of reward, but this effect was not present in male participants. In addition, within the endotoxin condition, decreases in VS activity in anticipation of reward were related to increases in inflammation for female but not male participants. CONCLUSIONS These findings may have implications for understanding how inflammation may contribute to sex differences in rates of depression.
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Affiliation(s)
- Mona Moieni
- Department of Psychology, Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles; California; Semel Institute for Neuroscience and Human Behavior, Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles; California
| | - Kevin M Tan
- Department of Psychology, Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles; California
| | - Tristen K Inagaki
- Department of Psychology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Keely A Muscatell
- Department of Psychology and Neuroscience, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Janine M Dutcher
- Department of Psychology, Carnegie Mellon University, Pittsburgh, Pennsylvania
| | - Ivana Jevtic
- Department of Psychology, Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles; California
| | - Elizabeth C Breen
- Semel Institute for Neuroscience and Human Behavior, Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles; California
| | - Michael R Irwin
- Semel Institute for Neuroscience and Human Behavior, Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles; California
| | - Naomi I Eisenberger
- Department of Psychology, Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, Los Angeles; California.
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Bang M, Kim J, An SK, Youm Y, Chey J, Kim HC, Park K, Namkoong K, Lee E. Associations of systemic inflammation with frontotemporal functional network connectivity and out-degree social-network size in community-dwelling older adults. Brain Behav Immun 2019; 79:309-313. [PMID: 30685533 DOI: 10.1016/j.bbi.2019.01.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 12/23/2018] [Accepted: 01/23/2019] [Indexed: 11/26/2022] Open
Abstract
Increasing evidence suggests that systemic inflammation adversely affects social experiences and behaviors of older adults by changing the functional state of the brain. In this study, we investigated the relationships among systemic inflammation, functional network connectivity (FNC) of the whole brain, and social-network size using complete social-network data of older adults residing in a Korean village. Sixty-one participants were recruited from the Korean Social Life, Health, and Aging Project (KSHAP). Participants underwent a resting-state functional magnetic resonance imaging scan. High sensitivity C-reactive protein (hs-CRP) levels were measured as an inflammation marker. In-degree and out-degree network sizes were calculated based on the total number of intimate social relationships per participant. We demonstrated that hs-CRP levels were associated with decreased frontotemporal FNC. Stronger frontotemporal FNC was significantly correlated with a larger out-degree network size, suggesting that impaired frontotemporal communication in older adults decreases perceived social connectedness with other people. An exploratory mediation analysis supported the observation that increased systemic inflammation contributes to reduced out-degree social-network size among older adults by changing frontotemporal FNC. The present findings provide meaningful insight into the complex relationship between systemic inflammation and social quality of life.
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Affiliation(s)
- Minji Bang
- Department of Psychiatry, CHA Bundang Medical Center, CHA University, 59 Yatap-ro, Bundang-gu, Seongnam, Gyeonggi-do 13496, Republic of Korea; Institute of Behavioral Science in Medicine, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
| | - Junsol Kim
- Department of Sociology, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Suk Kyoon An
- Institute of Behavioral Science in Medicine, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea; Department of Psychiatry, Severance Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
| | - Yoosik Youm
- Department of Sociology, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
| | - Jeanyung Chey
- Department of Psychology, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea.
| | - Hyeon Chang Kim
- Department of Preventive Medicine, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
| | - Kyungmee Park
- Institute of Behavioral Science in Medicine, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea; Department of Psychiatry, Severance Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
| | - Kee Namkoong
- Institute of Behavioral Science in Medicine, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea; Department of Psychiatry, Severance Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
| | - Eun Lee
- Institute of Behavioral Science in Medicine, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea; Department of Psychiatry, Severance Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
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Heym N, Heasman BC, Hunter K, Blanco SR, Wang GY, Siegert R, Cleare A, Gibson GR, Kumari V, Sumich AL. The role of microbiota and inflammation in self-judgement and empathy: implications for understanding the brain-gut-microbiome axis in depression. Psychopharmacology (Berl) 2019; 236:1459-1470. [PMID: 30955108 PMCID: PMC6598942 DOI: 10.1007/s00213-019-05230-2] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 03/18/2019] [Indexed: 12/31/2022]
Abstract
RATIONALE The gut-brain axis includes bidirectional communication between intestinal microbiota and the central nervous system. Bifidobacterium and Lactobacillus spp. have been implicated in psychological health, such as depression, through various pathways (e.g. inflammation). Research needs a better understanding of direct and indirect effects through examination of psychological factors that make people susceptible to, or offer protection against, depression. OBJECTIVE This study investigated the relationships between gut microbiota, inflammation and psychological risk and resilience factors for depression. METHODS Forty participants (13 m/27 f) recruited from the general population completed self-report questionnaires for depression, self-judgement, over-identification and affective and cognitive empathy. Faecal and blood samples were taken to assay microbiota (Bifidobacterium; Lactobacillus spp.) and pro-inflammatory molecules (C-reactive protein, CRP and interleukin-6, IL-6), respectively. RESULTS Hierarchical regression analyses (controlling for sex, age and the shared variance of risk and resilience factors) showed that (i) cognitive depression was significantly predicted by negative self-judgement and reduced cognitive empathy; (ii) abundance of Lactobacillus spp. was directly related to positive self-judgement but only indirectly to cognitive depression and lower affective empathy (both through self-judgement); and (iii) CRP was the strongest predictor of reduced cognitive empathy, with suppression effects seen for age (negative) and IL-6 (positive) after controlling for CRP. CONCLUSIONS Findings suggest that lactobacilli and inflammation may be differentially associated with mood disorder via brain mechanisms underpinning self-judgement and cognitive empathy, respectively. Further trials investigating interventions to increase Lactobacillus spp. in depression would benefit from direct measures of self-judgement and affective empathic distress, whilst those that aim to reduce inflammation should investigate cognitive empathy.
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Affiliation(s)
- N Heym
- Division of Psychology, Nottingham Trent University, Nottingham, NG1 4FQ, UK.
| | - B C Heasman
- Division of Psychology, Nottingham Trent University, Nottingham, NG1 4FQ, UK
| | - K Hunter
- Division of Sports Science, Nottingham Trent University, Nottingham, UK
| | - S R Blanco
- Division of Psychology, Nottingham Trent University, Nottingham, NG1 4FQ, UK
| | - G Y Wang
- Department of Psychology, Auckland University of Technology, Auckland, New Zealand
| | - R Siegert
- Department of Psychology, Auckland University of Technology, Auckland, New Zealand
| | - A Cleare
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - G R Gibson
- Food and Nutritional Sciences, University of Reading, Reading, UK
| | - V Kumari
- Centre for Cognitive Neuroscience, Brunel University London, Uxbridge, UK
| | - A L Sumich
- Division of Psychology, Nottingham Trent University, Nottingham, NG1 4FQ, UK
- Department of Psychology, Auckland University of Technology, Auckland, New Zealand
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Balter LJT, Hulsken S, Aldred S, Drayson MT, Higgs S, Veldhuijzen van Zanten JJCS, Raymond JE, Bosch JA. Low-grade inflammation decreases emotion recognition - Evidence from the vaccination model of inflammation. Brain Behav Immun 2018; 73:216-221. [PMID: 29742460 DOI: 10.1016/j.bbi.2018.05.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 05/04/2018] [Accepted: 05/05/2018] [Indexed: 12/11/2022] Open
Abstract
The ability to adequately interpret the mental state of another person is key to complex human social interaction. Recent evidence suggests that this ability, considered a hallmark of 'theory of mind' (ToM), becomes impaired by inflammation. However, extant supportive empirical evidence is based on experiments that induce not only inflammation but also induce discomfort and sickness, factors that could also account for temporary social impairment. Hence, an experimental inflammation manipulation was applied that avoided this confound, isolating effects of inflammation and social interaction. Forty healthy male participants (mean age = 25, SD = 5 years) participated in this double-blind placebo-controlled crossover trial. Inflammation was induced using Salmonella Typhi vaccination (0.025 mg; Typhim Vi, Sanofi Pasteur, UK); saline-injection was used as a control. About 6 h 30 m after injection in each condition, participants completed the Reading the Mind in the Eyes Test (RMET), a validated test for assessing how well the mental states of others can be inferred through observation of the eyes region of the face. Vaccination induced systemic inflammation, elevating IL-6 by +419% (p < .001), without fever, sickness symptoms (e.g., nausea, light-headedness), or mood changes (all p's > .21). Importantly, compared to placebo, vaccination significantly reduced RMET accuracy (p < .05). RMET stimuli selected on valence (positive, negative, neutral) provided no evidence of a selective impact of treatment. By utilizing an inflammation-induction procedure that avoided concurrent sicknesses or symptoms in a double-blinded design, the present study provides further support for the hypothesis that immune activation impairs ToM. Such impairment may provide a mechanistic link explaining social-cognitive deficits in psychopathologies that exhibit low-grade inflammation, such as major depression.
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Affiliation(s)
- Leonie J T Balter
- School of Psychology, University of Birmingham, Birmingham, UK; Psychology Department, Clinical Psychology, University of Amsterdam, Amsterdam, The Netherlands.
| | - Sasha Hulsken
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, UK; Psychology Department, Clinical Psychology, University of Amsterdam, Amsterdam, The Netherlands
| | - Sarah Aldred
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, UK
| | - Mark T Drayson
- Institute of Immunity and Immunotherapy, University of Birmingham, Birmingham, UK
| | - Suzanne Higgs
- School of Psychology, University of Birmingham, Birmingham, UK
| | | | - Jane E Raymond
- School of Psychology, University of Birmingham, Birmingham, UK
| | - Jos A Bosch
- Psychology Department, Clinical Psychology, University of Amsterdam, Amsterdam, The Netherlands
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Kotulla S, Elsenbruch S, Roderigo T, Brinkhoff A, Wegner A, Engler H, Schedlowski M, Benson S. Does Human Experimental Endotoxemia Impact Negative Cognitions Related to the Self? Front Behav Neurosci 2018; 12:183. [PMID: 30186124 PMCID: PMC6113574 DOI: 10.3389/fnbeh.2018.00183] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Accepted: 08/02/2018] [Indexed: 12/27/2022] Open
Abstract
A role of inflammatory processes in the pathophysiology of depression is increasingly recognized. Experimental endotoxemia offers an established model to induce transient systemic inflammation in healthy humans, and has been proposed as an experimental paradigm of depression. Indeed, different symptoms of depression can be observed during experimental endotoxemia, including negative mood or dysthymia as key symptoms of depression. Hopelessness and low self-esteem constitute common cognitive symptoms in depression, but have not been specifically assessed during endotoxemia. Thus, we pooled data from healthy volunteers who received low-dose endotoxin (i.e., 0.4 or 0.8 ng/kg lipopolysaccharide, LPS) or placebo in three randomized, controlled studies to investigate the effects of LPS on cognitive schemata related to depression. Validated questionnaires were used to assess self-esteem, hopelessness and the vulnerability factor intolerance of uncertainty after intravenous injection of LPS or placebo. Plasma tumor necrosis factor (TNF)-α and interleukin (IL)-6 were repeatedly assessed, along with self-reported mood. Because not all questionnaires were available from primary studies, data were analyzed in two separate data sets: In data set 1, self-esteem and intolerance of uncertainty were assessed in N = 87 healthy volunteers, who randomly received either 0.4 or 0.8 ng/kg LPS or placebo. In data set 2, hopelessness was measured in N = 59 volunteers who randomly received either LPS (0.8 ng/kg) or placebo. In both data sets, LPS-application led to significant increases in TNF-α and IL-6, reflecting systemic inflammation. Positive mood was significantly decreased in response to LPS, in line with inflammation-induced mood impairment. General self-esteem, intolerance of uncertainty and hopelessness did not differ between LPS- and placebo groups, suggesting that these negative cognitive schemata are not responsive to acute LPS-induced systemic inflammation. Interestingly, LPS-treated volunteers reported significantly lower body-related self-esteem, which was associated with increased TNF-α concentration. Thus, certain aspects of self-esteem related to physical attractiveness and sportiness were reduced. It is conceivable that this effect is primarily related to physical sickness symptoms and reduced physical ability during experimental endotoxemia. With respect to cognitive symptoms of depression, it is conceivable that LPS affects cognitive processes, but not negative cognitive schemata, which are rather based on learning and repeated experiences.
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Affiliation(s)
- Simone Kotulla
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Sigrid Elsenbruch
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Till Roderigo
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Alexandra Brinkhoff
- Department of Nephrology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Alexander Wegner
- Clinic for Trauma and Orthopedic Surgery, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Harald Engler
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Manfred Schedlowski
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Sven Benson
- Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
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Quadt L, Critchley HD, Garfinkel SN. The neurobiology of interoception in health and disease. Ann N Y Acad Sci 2018; 1428:112-128. [PMID: 29974959 DOI: 10.1111/nyas.13915] [Citation(s) in RCA: 202] [Impact Index Per Article: 33.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 04/30/2018] [Accepted: 06/05/2018] [Indexed: 12/13/2022]
Abstract
Interoception is the sensing of internal bodily sensations. Interoception is an umbrella term that encompasses (1) the afferent (body-to-brain) signaling through distinct neural and humoral (including immune and endocrine) channels; (2) the neural encoding, representation, and integration of this information concerning internal bodily state; (3) the influence of such information on other perceptions, cognitions, and behaviors; (4) and the psychological expression of these representations as consciously accessible physical sensations and feelings. Interoceptive mechanisms ensure physiological health through the cerebral coordination of homeostatic reflexes and allostatic responses that include motivational behaviors and associated affective and emotional feelings. Furthermore, the conscious, unitary sense of self in time and space may be grounded in the primacy and lifelong continuity of interoception. Body-to-brain interactions influence physical and mental well-being. Consequently, we show that systematic investigation of how individual differences, and within-individual changes, in interoceptive processing can contribute to the mechanistic understanding of physical and psychological disorders. We present a neurobiological overview of interoception and describe how interoceptive impairments at different levels relate to specific physical and mental health conditions, including sickness behaviors and fatigue, depression, eating disorders, autism, and anxiety. We frame these findings in an interoceptive predictive processing framework and highlight potential new avenues for treatments.
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Affiliation(s)
- Lisa Quadt
- Department of Psychiatry and Neuroscience, Brighton and Sussex Medical School (BSMS), Trafford Centre, University of Sussex, Brighton, United Kingdom
| | - Hugo D Critchley
- Department of Psychiatry and Neuroscience, Brighton and Sussex Medical School (BSMS), Trafford Centre, University of Sussex, Brighton, United Kingdom.,Sackler Centre for Consciousness Science, University of Sussex, Brighton, United Kingdom
| | - Sarah N Garfinkel
- Department of Psychiatry and Neuroscience, Brighton and Sussex Medical School (BSMS), Trafford Centre, University of Sussex, Brighton, United Kingdom.,Sackler Centre for Consciousness Science, University of Sussex, Brighton, United Kingdom
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Lasselin J, Lekander M, Axelsson J, Karshikoff B. Sex differences in how inflammation affects behavior: What we can learn from experimental inflammatory models in humans. Front Neuroendocrinol 2018; 50:91-106. [PMID: 29935190 DOI: 10.1016/j.yfrne.2018.06.005] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 05/29/2018] [Accepted: 06/19/2018] [Indexed: 12/12/2022]
Abstract
Human models demonstrate that experimental activation of the innate immune system has profound effects on brain activation and behavior, inducing fatigue, worsened mood and pain sensitivity. It has been proposed that inflammation is a mechanism involved in the etiology and maintenance of depression, chronic pain and long-term fatigue. These diseases show a strong female overrepresentation, suggesting that a better understanding of sex differences in how inflammation drives behavior could help the development of individualized treatment interventions. For this purpose, we here review sex differences in studies using experimental inflammatory models to investigate changes in brain activity and behavior. We suggest a model in which inflammation accentuates sex differences in brain networks and pre-existing vulnerability factors. This effect could render women more vulnerable to the detrimental effects of immune-to-brain communication over time. We call for systematic and large scale investigations of vulnerability factors for women in the behavioral response to inflammation.
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Affiliation(s)
- Julie Lasselin
- Stress Research Institute, Stockholm University, Stockholm, Sweden; Division of Psychology, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden; Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, Essen, Germany
| | - Mats Lekander
- Stress Research Institute, Stockholm University, Stockholm, Sweden; Division of Psychology, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden; Osher Center for Integrative Medicine, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - John Axelsson
- Stress Research Institute, Stockholm University, Stockholm, Sweden; Division of Psychology, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Bianka Karshikoff
- Stress Research Institute, Stockholm University, Stockholm, Sweden; Division of Psychology, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden; Osher Center for Integrative Medicine, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden; Division of Pain Medicine, Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University School of Medicine, Palo Alto, USA.
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40
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Moieni M, Eisenberger NI. Effects of inflammation on social processes and implications for health. Ann N Y Acad Sci 2018; 1428:5-13. [PMID: 29806109 DOI: 10.1111/nyas.13864] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 04/24/2018] [Accepted: 05/01/2018] [Indexed: 12/14/2022]
Abstract
Although at first glance inflammation and social behavior may appear unrelated, research points to an important role for inflammation in shaping social processes. This review summarizes findings in this field, specifically highlighting work that provides support for the idea that inflammation can lead to (1) increases in sensitivity to negative, threatening social experiences and (2) increases in sensitivity to positive, socially rewarding experiences. These diverging sensitivities in response to inflammation may depend on context and be adaptive for recuperation and recovery from illness. This review also discusses the implications of these findings for health and future research, including implications for depression, loneliness, and inflammatory disorders.
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Affiliation(s)
- Mona Moieni
- Department of Psychology, University of California, Los Angeles, Los Angeles, California
| | - Naomi I Eisenberger
- Department of Psychology, University of California, Los Angeles, Los Angeles, California
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41
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Effects of acute systemic inflammation on the interplay between sad mood and affective cognition. Transl Psychiatry 2017; 7:1281. [PMID: 29225332 PMCID: PMC5802562 DOI: 10.1038/s41398-017-0043-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 08/31/2017] [Accepted: 09/15/2017] [Indexed: 12/27/2022] Open
Abstract
Experimental endotoxemia is a translational model to study inflammatory mechanisms involved in the pathophysiology of mood disorders including depression. Disturbed affective cognition constitutes a core aspect in depression, but has never been studied in the context of inflammation. We combined experimental endotoxemia with an established experimental mood induction procedure to assess the interaction between acute inflammation and sad mood and their effects on affective cognition. In this randomized cross-over study, N = 15 healthy males received endotoxin (0.8 ng/kg lipopolysaccharide iv) on one study day and placebo an otherwise identical study day. The affective Go/Nogo task was conducted after experimental induction of neutral and sad mood. Inflammatory markers were assessed hourly. Endotoxin application induced a transient systemic inflammation, characterized by increased leukocyte counts, TNF-alpha and interleukin-6 plasma concentrations (all p < 0.01, interaction effects). Mood induction led to greater sadness ratings, with highest ratings when sad mood was induced during inflammation (p < 0.05, interaction effect). Based on a 2 (endotoxin vs. placebo) × 2 (sad vs. neutral mood) × 2 (sad vs. happy Go/Nogo target words) factorial design, we observed a significant target × endotoxin condition interaction (p < 0.01) reflecting slower responses to sad targets during endotoxemia. Additionally, we found a valence × mood interaction (p < 0.05), reflecting slower reaction times to sad targets in sad mood. In summary, acute inflammation and sad mood are risk factors for disturbed affective cognition. The results may reflect a mood-congruency effect, with prolonged and sustained processing of mood-congruent information during acute inflammation, which may contribute to depression risk.
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Abstract
Recent empirical findings from clinical and genetic studies suggest that mentalization, a key area of social cognition, is a distinct construct, although it is closely related to the neurocognitive deficits and symptoms of schizophrenia. Mentalization contributes a great deal to impaired social functioning. Current measures often display methodological problems, and many aspects should be taken into account when assessing mentalization. Moreover, advances in cognitive and affective neurosciences have led to the development of more advanced behavioral methods to assess the relationship between cognitive functions, symptoms, and social cognition based on their underlying neural mechanisms. The development of assessment tools that better examine the neural circuitry of such relationships may lead to the development of new psychosocial and pharmacological treatments.
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Soualeh N, Soulimani R, Bouayed J. Hippocampal-dependent memory deficit induced by perinatal exposure to polutted eels in middle-aged offspring mice: Sex differential effects. Toxicol Lett 2017; 280:247-258. [PMID: 28847518 DOI: 10.1016/j.toxlet.2017.08.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 08/20/2017] [Accepted: 08/21/2017] [Indexed: 01/11/2023]
Abstract
The effects of perinatal exposure to low, intermediate, or highly polluted eels on neonatal, postnatal, adult and middle-aged brain inflammation, and on cognitive performances of middle-aged offspring mice were compared to those of offspring controls. Inflammatory markers in microglia were assessed in offspring on the postnatal days-PNDs 1, 21, 100 and 330. Activated p38MAPK, ERK-1/2 and p65, and acetylcholine levels were assessed in the middle-aged hippocampus. Plasma myeloperoxidase and corticosterone levels were evaluated at PND 330. Learning and its retention, and working memory in middle-aged offspring were assessed using the Morris water maze, and Y-maze. Our results showed enhanced microglia production of inflammatory markers across the lifespan of male as well as female exposed offspring. Inflammation and increased p38 MAPK activation were detected in the exposed middle-aged hippocampus of both exposed sexes. Significant levels of MPO, but not corticosterone, were found in middle-aged males and females perinatally exposed to eels. However, decreases in ERK1/2 and p65 activation, and acetylcholine levels were only detected in female hippocampus exposed to either intermediately or highly polluted eels. Sex selective effects were also detected with regard to memory, the only altered cognitive function. Thus, middle-aged females, but not males, perinatally exposed to either intermediately or highly polluted eels take longer to locate the escape platform, spend considerably less time in the platform and perform less visit to the platform in the retention test. Our results suggest perinatal programming of hippocampal-dependent memory deficit by inflammation in middle-aged offspring, in sex and dose dependent manner.
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Affiliation(s)
- Nidhal Soualeh
- Université de Lorraine, Neurotoxicologie Alimentaire et Bioactivité, Rue du Général Delestraint, Campus Bridoux, 57070 Metz, France
| | - Rachid Soulimani
- Université de Lorraine, Neurotoxicologie Alimentaire et Bioactivité, Rue du Général Delestraint, Campus Bridoux, 57070 Metz, France
| | - Jaouad Bouayed
- Université de Lorraine, Neurotoxicologie Alimentaire et Bioactivité, Rue du Général Delestraint, Campus Bridoux, 57070 Metz, France.
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Lopresti AL. Cognitive behaviour therapy and inflammation: A systematic review of its relationship and the potential implications for the treatment of depression. Aust N Z J Psychiatry 2017; 51:565-582. [PMID: 28382827 DOI: 10.1177/0004867417701996] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
OBJECTIVE There is growing evidence confirming increased inflammation in a subset of adults with depression. The impact of this relationship has mostly been considered in biologically based interventions; however, it also has potential implications for psychological therapies. Cognitive behaviour therapy is the most commonly used psychological intervention for the treatment of depression with theories around its efficacy primarily based on psychological mechanisms. However, cognitive behaviour therapy may have an effect on, and its efficacy influenced by, physiological processes associated with depression. Accordingly, the purpose of this systematic review was to examine the relationship between cognitive behaviour therapy and inflammation. METHOD Studies examining the anti-inflammatory effects of cognitive behaviour therapy in people with depression and other medical conditions (e.g. cancer, diabetes and heart disease) were examined. In addition, the relationship between change in inflammatory markers and change in depressive symptoms following cognitive behaviour therapy, and the influence of pre-treatment inflammation on cognitive behaviour therapy treatment response were reviewed. RESULTS A total of 23 studies investigating the anti-inflammatory effects of cognitive behaviour therapy were identified. In 14 of these studies, at least one reduction in an inflammatory marker was reported, increases were identified in three studies and no change was found in six studies. Three studies examined the relationship between change in inflammation and change in depressive symptoms following cognitive behaviour therapy. In two of these studies, change in depressive symptoms was associated with a change in at least one inflammatory marker. Finally, three studies examined the influence of pre-treatment inflammation on treatment outcome from cognitive behaviour therapy, and all indicated a poorer treatment response in people with higher premorbid inflammation. CONCLUSION Preliminary evidence suggests inflammation should be considered within the context of cognitive behaviour therapy, although robust studies examining the relationship are sparse, and heterogeneity between studies and populations examined was high. The potential treatment implications of the bi-directional relationship between inflammation and cognitive behaviour therapy are discussed, and recommendations for future research are proposed.
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Affiliation(s)
- Adrian L Lopresti
- School of Psychology and Exercise Science, Murdoch University, Perth, WA, Australia
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45
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Benson S, Engler H, Wegner A, Rebernik L, Spreitzer I, Schedlowski M, Elsenbruch S. What Makes You Feel Sick After Inflammation? Predictors of Acute and Persisting Physical Sickness Symptoms Induced by Experimental Endotoxemia. Clin Pharmacol Ther 2017; 102:141-151. [PMID: 28074475 DOI: 10.1002/cpt.618] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 01/03/2017] [Accepted: 01/04/2017] [Indexed: 12/12/2022]
Abstract
We aimed to identify statistical predictor variables of lipopolysaccharide (LPS)-induced physical sickness symptoms during the acute and late inflammatory phases using multivariate regression analyses. Data from N = 128 healthy volunteers who received i.v. LPS injection (0.4 or 0.8 ng/kg) or placebo were pooled for analyses. Physical sickness symptoms experienced during the acute (0-6h postinjection) and late (6-24h postinjection) phases were assessed with the validated General-Assessment-of-Side-Effects (GASE) questionnaire. LPS-treated subjects reported significantly more physical sickness symptoms. Physical symptoms during the acute phase were associated with LPS-induced mood impairments and interleukin (IL)-6 increases, explaining 28.5% of variance in GASE scores. During late phase, LPS-induced increases in cortisol and IL-6 plasma concentrations and baseline depression were significant predictor variables, explaining 38.5% of variance. In patients with recurrent or chronic inflammatory states, these factors may act as risk factors ultimately contributing to an exacerbation of sickness symptoms, and should be considered as potential targets for therapeutic strategies.
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Affiliation(s)
- S Benson
- Institute of Medical Psychology & Behavioral Immunobiology, University Hospital Essen, University of Duisburg-Essen, Germany
| | - H Engler
- Institute of Medical Psychology & Behavioral Immunobiology, University Hospital Essen, University of Duisburg-Essen, Germany
| | - A Wegner
- Clinic for Trauma and Orthopedic Surgery, University Hospital Essen, University of Duisburg-Essen, Germany
| | - L Rebernik
- Institute of Medical Psychology & Behavioral Immunobiology, University Hospital Essen, University of Duisburg-Essen, Germany
| | - I Spreitzer
- Paul Ehrlich Institute, Federal Agency for Sera and Vaccines, Langen, Germany
| | - M Schedlowski
- Institute of Medical Psychology & Behavioral Immunobiology, University Hospital Essen, University of Duisburg-Essen, Germany
| | - S Elsenbruch
- Institute of Medical Psychology & Behavioral Immunobiology, University Hospital Essen, University of Duisburg-Essen, Germany
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Bollen J, Trick L, Llewellyn D, Dickens C. The effects of acute inflammation on cognitive functioning and emotional processing in humans: A systematic review of experimental studies. J Psychosom Res 2017; 94:47-55. [PMID: 28183402 DOI: 10.1016/j.jpsychores.2017.01.002] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 01/03/2017] [Accepted: 01/03/2017] [Indexed: 01/19/2023]
Abstract
OBJECTIVE The cognitive neuropsychological model of depression proposes that negative biases in the processing of emotionally salient information have a central role in the development and maintenance of depression. We have conducted a systematic review to determine whether acute experimental inflammation is associated with changes to cognitive and emotional processing that are thought to cause and maintain depression. METHODS We identified experimental studies in which healthy individuals were administered an acute inflammatory challenge (bacterial endotoxin/vaccination) and standardised tests of cognitive function were performed. RESULTS Fourteen references were identified, reporting findings from 12 independent studies on 345 participants. Methodological quality was rated strong or moderate for 11 studies. Acute experimental inflammation was triggered using a variety of agents (including endotoxin from E. coli, S. typhi, S. abortus Equi and Hepatitis B vaccine) and cognition was assessed over hours to months, using cognitive tests of i) attention/executive functioning, ii) memory and iii) social/emotional processing. Studies found mixed evidence that acute experimental inflammation caused changes to attention/executive functioning (2 of 6 studies showed improvements in attention executive function compared to control), changes in memory (3 of 5 studies; improved reaction time: reduced memory for object proximity: poorer immediate and delayed memory) and changes to social/emotional processing (4 of 5 studies; reduced perception of emotions, increased avoidance of punishment/loss experiences, and increased social disconnectedness). CONCLUSIONS Acute experimental inflammation causes negative biases in social and emotional processing that could explain observed associations between inflammation and depression.
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Affiliation(s)
- Jessica Bollen
- Mental Health Research Group, University of Exeter Medical School, College House, St Luke's Campus, Exeter EX1 2LU, United Kingdom
| | - Leanne Trick
- Mental Health Research Group, University of Exeter Medical School, College House, St Luke's Campus, Exeter EX1 2LU, United Kingdom
| | - David Llewellyn
- Mental Health Research Group, University of Exeter Medical School, College House, St Luke's Campus, Exeter EX1 2LU, United Kingdom
| | - Chris Dickens
- Mental Health Research Group, University of Exeter Medical School, College House, St Luke's Campus, Exeter EX1 2LU, United Kingdom.
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47
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Eisenberger NI, Moieni M, Inagaki TK, Muscatell KA, Irwin MR. In Sickness and in Health: The Co-Regulation of Inflammation and Social Behavior. Neuropsychopharmacology 2017; 42:242-253. [PMID: 27480575 PMCID: PMC5143485 DOI: 10.1038/npp.2016.141] [Citation(s) in RCA: 230] [Impact Index Per Article: 32.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 06/16/2016] [Accepted: 07/18/2016] [Indexed: 01/18/2023]
Abstract
Although it has commonly been assumed that the immune system and the processes that govern social behavior are separate, non-communicating entities, research over the past several decades suggests otherwise. Considerable evidence now shows that inflammatory processes and social behavior are actually powerful regulators of one another. This review first summarizes evidence that inflammatory processes regulate social behavior, leading to characteristic changes that may help an individual navigate the social environment during times of sickness. Specifically, this review shows that inflammation: (1) increases threat-related neural sensitivity to negative social experiences (eg, rejection, negative social feedback), presumably to enhance sensitivity to threats to well-being or safety in order to avoid them and (2) enhances reward-related neural sensitivity to positive social experiences (eg, viewing close others and receiving positive social feedback), presumably to increase approach-related motivation towards others who might provide support and care during sickness. Next, this review summarizes evidence showing that social behavior also regulates aspects of inflammatory activity, preparing the body for situations in which wounding and infection may be more likely (social isolation). Here, we review research showing: (1) that exposure to social stressors increases proinflammatory activity, (2) that individuals who are more socially isolated (ie, lonely) show increased proinflammatory activity, and (3) that individuals who are more socially isolated show increased proinflammatory activity in response to an inflammatory challenge or social stressor. The implications of the co-regulation of inflammation and social behavior are discussed.
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Affiliation(s)
- Naomi I Eisenberger
- Department of Psychology, University of California, Los Angeles, CA, USA,Department of Psychology, University of California, 1285 Franz Hall, Box 951563, Los Angeles, CA 90095-1563, USA, Tel: +1 310 267 5196, Fax: +1 310 206 5895, E-mail:
| | - Mona Moieni
- Department of Psychology, University of California, Los Angeles, CA, USA
| | - Tristen K Inagaki
- Department of Psychology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Keely A Muscatell
- Department of Psychology, University of North Carolina-Chapel Hill, Chapel Hill, NC, USA
| | - Michael R Irwin
- Department of Psychiatry and Biobehavioral Sciences and Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, CA, USA
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48
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Rowland LM, Demyanovich HK, Wijtenburg SA, Eaton WW, Rodriguez K, Gaston F, Cihakova D, Talor MV, Liu F, McMahon RR, Hong LE, Kelly DL. Antigliadin Antibodies (AGA IgG) Are Related to Neurochemistry in Schizophrenia. Front Psychiatry 2017; 8:104. [PMID: 28674504 PMCID: PMC5474459 DOI: 10.3389/fpsyt.2017.00104] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 05/29/2017] [Indexed: 12/18/2022] Open
Abstract
Inflammation may play a role in schizophrenia; however, subgroups with immune regulation dysfunction may serve as distinct illness phenotypes with potential different treatment and prevention strategies. Emerging data show that about 30% of people with schizophrenia have elevated antigliadin antibodies of the IgG type, representing a possible subgroup of schizophrenia patients with immune involvement. Also, recent data have shown a high correlation of IgG-mediated antibodies between the periphery and cerebral spinal fluid in schizophrenia but not healthy controls, particularly AGA IgG suggesting that these antibodies may be crossing the blood-brain barrier with resulting neuroinflammation. Proton magnetic resonance spectroscopy (MRS) is a non-invasive technique that allows the quantification of certain neurochemicals in vivo that may proxy inflammation in the brain such as myoinositol and choline-containing compounds (glycerophosphorylcholine and phosphorylcholine). The objective of this exploratory study was to examine the relationship between serum AGA IgG levels and MRS neurochemical levels. We hypothesized that higher AGA IgG levels would be associated with higher levels of myoinositol and choline-containing compounds (glycerophosphorylcholine plus phosphorylcholine; GPC + PC) in the anterior cingulate cortex. Thirty-three participants with a DSM-IV diagnosis of schizophrenia or schizoaffective disorder had blood drawn and underwent neuroimaging using MRS within 9 months. We found that 10/33 (30%) had positive AGA IgG (≥20 U) similar to previous findings. While there were no significant differences in myoinositol and GPC + PC levels between patients with and without AGA IgG positivity, there were significant relationships between both myoinositol (r = 0.475, p = 0.007) and GPC + PC (r = 0.36, p = 0.045) with AGA IgG levels. This study shows a possible connection of AGA IgG antibodies to putative brain inflammation as measured by MRS in schizophrenia.
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Affiliation(s)
- Laura M Rowland
- Maryland Psychiatric Research Center, Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Haley K Demyanovich
- Maryland Psychiatric Research Center, Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, United States
| | - S Andrea Wijtenburg
- Maryland Psychiatric Research Center, Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, United States
| | - William W Eaton
- Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Katrina Rodriguez
- Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Frank Gaston
- Maryland Psychiatric Research Center, Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Daniela Cihakova
- Immunologic Disorders Laboratory, Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Monica V Talor
- Immunologic Disorders Laboratory, Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Fang Liu
- Maryland Psychiatric Research Center, Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Robert R McMahon
- Maryland Psychiatric Research Center, Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, United States
| | - L Elliot Hong
- Maryland Psychiatric Research Center, Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Deanna L Kelly
- Maryland Psychiatric Research Center, Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, United States
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49
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Abstract
Systemic inflammation rapidly impairs mood, motivation, and cognition inducing a stereotyped cluster of symptoms collectively known as "sickness behaviors." When inflammation is severe or chronic, these behavioral changes can appear indistinguishable from major depressive disorder (MDD). Human and rodent neuroimaging combined with experimental inflammatory challenges has clarified the neural circuitry associated with many of the key features of inflammation-induced-sickness behavior, and in so doing revealed often-remarkable commonalities with circuit abnormalities observed in MDD. This review aims to provide the first synthesis of this work illustrating areas of convergence and divergence with the MDD literature as well as highlighting areas for future study.
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Affiliation(s)
- Neil A Harrison
- Department of Neuroscience, Brighton & Sussex Medical School, University of Sussex, Brighton, BN1 9RR, UK.
- Sackler Centre for Consciousness Science, University of Sussex, Brighton, BN1 9RR, UK.
- Sussex Partnership NHS Foundation Trust, Swandean, West Sussex, BN13 3E, UK.
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50
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Muscatell KA, Moieni M, Inagaki TK, Dutcher JM, Jevtic I, Breen EC, Irwin MR, Eisenberger NI. Exposure to an inflammatory challenge enhances neural sensitivity to negative and positive social feedback. Brain Behav Immun 2016; 57:21-29. [PMID: 27032568 PMCID: PMC5011017 DOI: 10.1016/j.bbi.2016.03.022] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 03/19/2016] [Accepted: 03/26/2016] [Indexed: 02/05/2023] Open
Abstract
Inflammation, part of the body's innate immune response, can lead to "sickness behaviors," as well as alterations in social and affective experiences. Elevated levels of pro-inflammatory cytokines have been associated with increased neural sensitivity to social rejection and social threat, but also decreased neural sensitivity to rewards. However, recent evidence suggests that inflammation may actually enhance sensitivity to certain social rewards, such as those that signal support and care. Despite a growing interest in how inflammation influences neural reactivity to positive and negative social experiences, no known studies have investigated these processes in the same participants, using a similar task. To examine this issue, 107 participants were randomly assigned to receive either placebo or low-dose endotoxin, which safely triggers an inflammatory response. When levels of pro-inflammatory cytokines were at their peak, participants were scanned using fMRI while they received positive, negative, and neutral feedback from an "evaluator" (actually a confederate) about how they came across in an audio-recorded interview. In response to negative feedback (vs. neutral), participants in the endotoxin condition showed heightened neural activity in a number of threat-related neural regions (i.e., bilateral amygdala, dorsal anterior cingulate cortex) and a key mentalizing-related region (i.e., dorsomedial PFC), compared to placebo participants. Interestingly, when receiving positive feedback (vs. neutral), endotoxin (vs. placebo) led to greater neural activity in the ventral striatum and ventromedial PFC, regions often implicated in processing reward, as well as greater activity in dorsomedial PFC. Together, these results reveal that individuals exposed to an inflammatory challenge are more "neurally sensitive" to both negative and positive social feedback, suggesting that inflammation may lead to a greater vigilance for both social threats and social rewards.
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Affiliation(s)
- Keely A. Muscatell
- Department of Psychology, University of California, Berkeley, United States
| | - Mona Moieni
- Department of Psychology, University of California, Los Angeles, United States
| | | | - Janine M. Dutcher
- Department of Psychology, University of California, Los Angeles, United States
| | - Ivana Jevtic
- Department of Psychology, University of California, Los Angeles, United States
| | - Elizabeth C. Breen
- Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, United States,Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, United States
| | - Michael R. Irwin
- Department of Psychology, University of California, Los Angeles, United States,Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, United States,Cousins Center for Psychoneuroimmunology, University of California, Los Angeles, United States
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