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Abstract
Learned helplessness, the failure to escape shock induced by uncontrollable aversive events, was discovered half a century ago. Seligman and Maier (1967) theorized that animals learned that outcomes were independent of their responses-that nothing they did mattered-and that this learning undermined trying to escape. The mechanism of learned helplessness is now very well-charted biologically, and the original theory got it backward. Passivity in response to shock is not learned. It is the default, unlearned response to prolonged aversive events and it is mediated by the serotonergic activity of the dorsal raphe nucleus, which in turn inhibits escape. This passivity can be overcome by learning control, with the activity of the medial prefrontal cortex, which subserves the detection of control leading to the automatic inhibition of the dorsal raphe nucleus. So animals learn that they can control aversive events, but the passive failure to learn to escape is an unlearned reaction to prolonged aversive stimulation. In addition, alterations of the ventromedial prefrontal cortex-dorsal raphe pathway can come to subserve the expectation of control. We speculate that default passivity and the compensating detection and expectation of control may have substantial implications for how to treat depression. (PsycINFO Database Record
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Affiliation(s)
- Steven F Maier
- Department of Psychology and Neuroscience, University of Colorado
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152
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Yang PY, Menga YJ, Li T, Huang Y. Associations of endocrine stress-related gene polymorphisms with risk of autism spectrum disorders: Evidence from an integrated meta-analysis. Autism Res 2017; 10:1722-1736. [PMID: 28656683 DOI: 10.1002/aur.1822] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 04/12/2017] [Accepted: 05/23/2017] [Indexed: 02/05/2023]
Abstract
Autism spectrum disorders (ASD) are related to serotonin transporter (5-HTT) and catechol-O-methyl transferase (COMT) as two most monoaminergic polymorphic variations. However, multiple studies assessing rs4680 and 5-HTTLPR variants in ASD have reported inconsistent results. Therefore, we conducted an integrated meta-analysis to combine case-control and transmission/disequilibrium test (TDT) studies to determine whether COMT and 5-HTT are associated with ASD. We searched multiple electronic databases (PubMed, EmBase and Web of Science) to identify studies assessing the rs4680 and 5-HTTLPR variants in ASD from Jan 1997 to Dec 2016. Then allelic data from case-control and TDT studies were analyzed by the Catmap package in the R software. A total of 5 studies were eligible for the meta-analysis of rs4680, including 3 case-control, 1 TDT and 1 TDT & case-control studies. Meanwhile, 22 studies of 5-HTTLPR were available, including 16 TDT, 4 case-control and 2 TDT & case-control studies. The current meta-analysis included 814 ASD cases, 741 controls and 311 families related to rs4680; 749 ASD cases, 1,118 controls and 1,861 families relevant to 5-HTTLPR were also evaluated. For rs4680, the pooled OR was 1.18 (95% CI = 0.87-1.59, P = 0.29, Pheterogeneity < 0.00001). There was no significant association of rs4680 with risk of ASD between the two subgroups. For 5-HTTLPR, the pooled OR was 1.05 (95% CI = 0.92-1.20, P = 0.4652, Pheterogeneity < 0.00001). Meanwhile, we found no significant risk in individual case-control or TDT studies. The above findings indicated that neither COMT rs4680 nor 5-HTT 5-HTTLPR polymorphism significantly affects ASD risk. Autism Res 2017, 10: 1722-1736. © 2017 International Society for Autism Research, Wiley Periodicals, Inc. LAY SUMMARY Our results showed no evidence of significant association of either COMT rs4680 or 5-HTT 5-HTTLPR variants with ASD, showing that these two genes may not be major susceptible genetic factors in ASD occurrence, and may have a reciprocal action with each other in combination with environmental factors. These findings further provide evidence that a single gene variant may not dictate autism occurrence, but possibly contributes to a specific phenotype or subtype of ASD.
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Affiliation(s)
- Ping-Yuan Yang
- Mental Health Center, West China Hospital of Sichuan University, Chengdu, China
| | - Ya-Jing Menga
- Psychiatric Laboratory, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan, China.,Brain Research Center, West China Hospital of Sichuan University, Chengdu, China
| | - Tao Li
- Mental Health Center, West China Hospital of Sichuan University, Chengdu, China.,Psychiatric Laboratory, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan, China.,Brain Research Center, West China Hospital of Sichuan University, Chengdu, China
| | - Yi Huang
- Mental Health Center, West China Hospital of Sichuan University, Chengdu, China.,Psychiatric Laboratory, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan, China.,Brain Research Center, West China Hospital of Sichuan University, Chengdu, China
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153
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Vindas MA, Madaro A, Fraser TWK, Höglund E, Olsen RE, Kristiansen TS, Øverli Ø. Uncontrollable chronic stress reduces growth disparities in farmed Atlantic salmon. Physiol Behav 2017; 179:246-252. [PMID: 28668622 DOI: 10.1016/j.physbeh.2017.06.012] [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: 02/19/2017] [Revised: 06/23/2017] [Accepted: 06/23/2017] [Indexed: 11/30/2022]
Abstract
Individual variation in behavior and physiological traits in a wide variety of animals has been the focus of numerous studies in recent years. In this context, early life experiences shape responses that individuals have to subsequent environments, i.e. developmental plasticity. In this experiment, we subjected 10-month old fish to an unpredictable chronic stress (UCS) regime or no stress (control) for 3weeks. These individuals then underwent the parr-smolt transformation, when salmonids become adapted for the seawater environment, and were subsequently transferred into seawater before the final sampling. Biometric data was collected at the end of each period. Sampling on the final day was conducted in order to analyze basal monoaminergic activity in the brain stem and hypothalamus, as well as gene expression of target genes in the telencephalon. We found that post-hoc sorting of individuals by their serotonergic activity (high and low) resulted in the elucidation of growth and gene expression differences. UCS groups were found to have less growth disparities throughout the experiment, compared to control fish. Furthermore, we found brain serotonergic signaling and corticotropic releasing factor binding protein expression were positively associated with brain stem serotonergic activity, which is consistent with fish showing a stress reactivity neurophysiological profile. In conclusion, we here submit evidence that sorting individuals by their basal serotonergic activity levels may be a useful tool in the study of developmental plasticity. These results may thus apply directly to improving husbandry practices in aquaculture and elucidating neural mechanisms for coping behavior.
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Affiliation(s)
- Marco A Vindas
- Uni Research AS, P. O. Box 7810, 5020 Bergen, Norway; Department of Biosciences, University of Oslo, P. O. Box 1041, Blindern, NO-0316 Oslo, Norway.
| | | | - Thomas W K Fraser
- Department of Production Animal and Clinical Sciences, Norwegian University of Life Sciences, Oslo, Norway
| | - Erik Höglund
- National Institute of Aquatic Resources, Section for Aquaculture, Technical University of Denmark, North Sea Center, P. O. Box 101, DK-9850 Hirtshals, Denmark; Norwegian Institute for Water Research (NIVA), Oslo, Norway
| | - Rolf E Olsen
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | | | - Øyvind Øverli
- Department of Food Safety and Infection Biology, Norwegian University of Life Sciences, Oslo, Norway
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154
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Yoshino Y, Ochi S, Yamazaki K, Nakata S, Iga JI, Ueno SI. Endothelial nitric oxide synthase in rat brain is downregulated by sub-chronic antidepressant treatment. Psychopharmacology (Berl) 2017; 234:1663-1669. [PMID: 28275829 DOI: 10.1007/s00213-017-4567-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 02/15/2017] [Indexed: 11/24/2022]
Abstract
BACKGROUND Nitric oxide (NO) is a neurotransmitter that may be related to major depressive disorder (MDD) because the selective neuronal NO synthase (NOS) inhibitor, 7-nitroindazole, induces a dose-dependent antidepressant-like effect. NO modulates major neurotransmitters involved in the neurobiology of MDD, such as norepinephrine, serotonin, dopamine, and glutamate. In this study, we investigated the effects of antidepressants as NO modulators in acute and sub-chronic treatments. METHODS Rats were injected with the SSRI paroxetine (PAR, 10 mg/kg), the SNRI milnacipran (MIL, 30 mg/kg), or the NaSSA mirtazapine (MIR, 10 mg/kg) for acute (1 h) or sub-chronic (3 weeks) treatment prior to analysis of nine brain regions (frontal cortex, temporal cortex, striatum, thalamus, hippocampus, midbrain, pons, cerebellum, and olfactory bulb). The mRNA expression levels of three NOS subtypes (neuronal: nNOS, inducible: iNOS, and endothelial: eNOS) were analyzed using real-time PCR with Taqman probes. RESULTS Acute MIR treatment significantly increased nNOS mRNA expression in the hippocampus, midbrain, cerebellum and olfactory bulb, and iNOS mRNA expression in the frontal cortex and midbrain. Acute PAR and MIR treatments significantly increased eNOS mRNA expression in most brain regions. Conversely, sub-chronic treatment with all types of antidepressants resulted in significant decreases of eNOS mRNA expression in most brain regions. CONCLUSIONS Sub-chronic treatment with the three types of antidepressants consistently decreased eNOS mRNA expression levels in the rat brain. These effects may be associated with the involvement of the NO system in the mechanism of action of antidepressants.
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Affiliation(s)
- Yuta Yoshino
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime, 791-0295, Japan
| | - Shinichiro Ochi
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime, 791-0295, Japan
| | - Kiyohiro Yamazaki
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime, 791-0295, Japan
| | - Shunsuke Nakata
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime, 791-0295, Japan
| | - Jun-Ichi Iga
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime, 791-0295, Japan.
| | - Shu-Ichi Ueno
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime, 791-0295, Japan
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155
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Vindas MA, Magnhagen C, Brännäs E, Øverli Ø, Winberg S, Nilsson J, Backström T. Brain cortisol receptor expression differs in Arctic charr displaying opposite coping styles. Physiol Behav 2017; 177:161-168. [PMID: 28461088 DOI: 10.1016/j.physbeh.2017.04.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 04/21/2017] [Accepted: 04/26/2017] [Indexed: 12/17/2022]
Abstract
Individually consistent behavioral and physiological responses to stressful situations (often referred to as coping styles) has been reported in many animal species. Differences in hypothalamic-pituitary axis reactivity characterize individuals, and it has been proposed that the glucocorticoid (gr) and mineralocorticoid (mr) receptors are fundamental in regulating coping styles. We sorted individuals into reactive and proactive coping styles by collapsing behavioral outputs from net restraint and confinement stress tests in a principal component analysis. We then analyzed plasma cortisol levels, serotonin neurochemistry and the relative mRNA expression of gr1 and mr in stressed individuals per coping style. Proactive fish were characterized as having a lower serotonergic activity and being more active under stress. In addition, proactive fish had higher hypothalamic gr1 and mr abundance and a higher mr/gr1 ratio, compared to reactive fish. We found no significant differences in cortisol or telencephalic mRNA, gr1 and mr expression, or their ratio. Brain MR and GR have been proven to have an important role in the appraisal, coping and adaptation to stressful stimuli, so that a higher expression of these receptors in proactive fish suggests increased tolerance and performance under stress, compared to reactive individuals. We present evidence of a conserved neuroendocrine mechanism associated with coping styles in a fish species which is ecologically very diverse and considered to be the most cold-adapted fish in freshwater. We propose that this may be a first step into exploiting this model in order to better understand climate-change related effects in sub populations and ecophenotypes.
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Affiliation(s)
- Marco A Vindas
- Uni Environment, Uni Research AS, Bergen, Norway; Department of Biosciences, University of Oslo, Oslo, Norway.
| | - Carin Magnhagen
- Department of Wildlife, Fish, and Environmental Studies, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Eva Brännäs
- Department of Wildlife, Fish, and Environmental Studies, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Øyvind Øverli
- Department of Food Safety and Infection Biology, Norwegian University of Life Sciences, Oslo, Norway
| | - Svante Winberg
- Department of Neuroscience, Uppsala University, Uppsala, Sweden
| | - Jan Nilsson
- Department of Wildlife, Fish, and Environmental Studies, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Tobias Backström
- Department of Wildlife, Fish, and Environmental Studies, Swedish University of Agricultural Sciences, Umeå, Sweden
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156
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Houwing DJ, Buwalda B, van der Zee EA, de Boer SF, Olivier JDA. The Serotonin Transporter and Early Life Stress: Translational Perspectives. Front Cell Neurosci 2017; 11:117. [PMID: 28491024 PMCID: PMC5405142 DOI: 10.3389/fncel.2017.00117] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Accepted: 04/07/2017] [Indexed: 01/04/2023] Open
Abstract
The interaction between the serotonin transporter (SERT) linked polymorphic region (5-HTTLPR) and adverse early life stressing (ELS) events is associated with enhanced stress susceptibility and risk to develop mental disorders like major depression, anxiety, and aggressiveness. In particular, human short allele carriers are at increased risk. This 5-HTTLPR polymorphism is absent in the rodent SERT gene, but heterozygous SERT knockout rodents (SERT+/−) show several similarities to the human S-allele carrier, therefore creating an animal model of the human situation. Many rodent studies investigated ELS interactions in SERT knockout rodents combined with ELS. However, underlying neuromolecular mechanisms of the (mal)adaptive responses to adversity displayed by SERT rodents remain to be elucidated. Here, we provide a comprehensive review including studies describing mechanisms underlying SERT variation × ELS interactions in rodents. Alterations at the level of translation and transcription but also epigenetic alterations considerably contribute to underlying mechanisms of SERT variation × ELS interactions. In particular, SERT+/− rodents exposed to adverse early rearing environment may be of high translational and predictive value to the more stress sensitive human short-allele carrier, considering the similarity in neurochemical alterations. Therefore, SERT+/− rodents are highly relevant in research that aims to unravel the complex psychopathology of mental disorders. So far, most studies fail to show solid evidence for increased vulnerability to develop affective-like behavior after ELS in SERT+/− rodents. Several reasons may underlie these failures, e.g., (1) stressors used might not be optimal or severe enough to induce maladaptations, (2) effects in females are not sufficiently studied, and (3) few studies include both behavioral manifestations and molecular correlates of ELS-induced effects in SERT+/− rodents. Of course, one should not exclude the (although unlikely) possibility of SERT+/− rodents not being sensitive to ELS. In conclusion, future studies addressing ELS-induced effects in the SERT+/− rodents should extensively study both long-term behavioral and (epi)genetic aspects in both sexes. Finally, further research is warranted using more severe stressors in animal models. From there on, we should be able to draw solid conclusions whether the SERT+/− exposed to ELS is a suitable translational animal model for studying 5-HTTLPR polymorphism and stress interactions.
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Affiliation(s)
- Danielle J Houwing
- Unit Behavioral Neuroscience, Department of Neurobiology, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of GroningenGroningen, Netherlands
| | - Bauke Buwalda
- Unit Behavioral Neuroscience, Department of Neurobiology, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of GroningenGroningen, Netherlands
| | - Eddy A van der Zee
- Unit Molecular Neurobiology, Department of Neurobiology, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of GroningenGroningen, Netherlands
| | - Sietse F de Boer
- Unit Behavioral Neuroscience, Department of Neurobiology, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of GroningenGroningen, Netherlands
| | - Jocelien D A Olivier
- Unit Behavioral Neuroscience, Department of Neurobiology, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of GroningenGroningen, Netherlands
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157
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Henriksson HE, Sylvén SM, Kallak TK, Papadopoulos FC, Skalkidou A. Seasonal patterns in self-reported peripartum depressive symptoms. Eur Psychiatry 2017; 43:99-108. [PMID: 28391103 DOI: 10.1016/j.eurpsy.2017.03.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 02/28/2017] [Accepted: 03/02/2017] [Indexed: 10/19/2022] Open
Abstract
BACKGROUND In the peripartum period, the literature on seasonality in depression is still scarce and studies present varying findings. The aims of this study were to investigate whether seasonal patterns in postpartum depressive symptoms previously identified in a Swedish study could be replicated in a larger study, as well as to assess seasonal patterns in depressive symptoms during pregnancy. METHODS This was a nested case-control study comprised of 4129 women who participated in the BASIC project and gave birth at Uppsala University Hospital, Uppsala, Sweden, between February 2010 and December 2015. RESULTS Women who gave birth in October-December 2011 had an increased odds of depressive symptoms at 6 weeks postpartum, when compared with women giving birth in April-June 2011 (aOR=2.42; 95% CI: 1.12-5.26). The same pattern was found among women with a history of depression. No other seasonal patterns for depressive symptoms during pregnancy or at 6 weeks postpartum were identified. CONCLUSIONS In general, no consistent seasonal patterns were found in peripartum depressive symptoms. Whether the seasonal patterns found in some studies during certain years may be due to other factors relating to specific years and seasons, such as extreme climatic conditions or other particular events, warrants further investigation.
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Affiliation(s)
- H E Henriksson
- Department of Women's and Children's Health, Uppsala University, Uppsala University Hospital, 75185 Uppsala, Sweden.
| | - S M Sylvén
- Department of Women's and Children's Health, Uppsala University, Uppsala University Hospital, 75185 Uppsala, Sweden; Department of Neuroscience, Psychiatry, Uppsala University, Uppsala, Sweden
| | - T K Kallak
- Department of Women's and Children's Health, Uppsala University, Uppsala University Hospital, 75185 Uppsala, Sweden
| | - F C Papadopoulos
- Department of Neuroscience, Psychiatry, Uppsala University, Uppsala, Sweden
| | - A Skalkidou
- Department of Women's and Children's Health, Uppsala University, Uppsala University Hospital, 75185 Uppsala, Sweden
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158
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Abstract
Serotonin (5-HT) continues to attract researchers’ interest after almost a century. However, despite these efforts, its role has not yet been fully elucidated. It is now evident that 5-HT does not modulate single functions but rather a multiplicity of activities and behaviors present in both normal and several pathological conditions in a less deterministic way than previously assumed. This article aims to briefly review some of the latest advancements in the general role of 5-HT in psychiatry, particularly in depression, and offer the author’s personal reflections.
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Affiliation(s)
- Donatella Marazziti
- Dipartimento di Medicina Clinica e Sperimentale, Section of Psychiatry, University of Pisa, Via Roma, 67, 56100 Pisa, Italy
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159
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Singh T, Goel RK. Managing epilepsy-associated depression: Serotonin enhancers or serotonin producers? Epilepsy Behav 2017; 66:93-99. [PMID: 28038393 DOI: 10.1016/j.yebeh.2016.10.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Revised: 10/06/2016] [Accepted: 10/08/2016] [Indexed: 12/31/2022]
Abstract
Depression is one of the major psychiatric comorbidities having a major impact on the quality of life in people with epilepsy (PWE). Selective serotonin reuptake inhibitors (SSRIs) are considered as safest therapy for the treatment of depression in PWE. Although administration of SSRIs increases the synaptic serotonin levels, it decreases the overall serotonin synthesis in the brain. Long-term therapy with SSRIs has been reported to decrease serotonin synthesis, which may be the possible reason for lessening of their antidepressant effect over time as well as elevated seizure outcomes observed in PWE. Thus the present scenario warrants streamlined studies to explore the safety and efficacy of SSRIs as well as approaches beyond SSRIs for treatment of depression in epilepsy. In this review, we outline the approaches which may restore serotonin levels rather than a pseudo enhancement of serotonin with SSRIs. The potential of various anti-inflammatory approaches such as selective cyclooxygenase-2 inhibitors, inflammatory cytokine inhibitors, and indoleamine 2,3-dioxygenase inhibitors pertaining to their serotonin restoring effects is discussed as possible therapy for treatment of depression in epilepsy.
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Affiliation(s)
- Tanveer Singh
- Department of Pharmaceutical Sciences and Drug Research, Punjabi University, Patiala, India
| | - Rajesh Kumar Goel
- Department of Pharmaceutical Sciences and Drug Research, Punjabi University, Patiala, India.
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160
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Vrshek-Schallhorn S, Stroud CB, Mineka S, Zinbarg RE, Adam EK, Redei EE, Hammen C, Craske MG. Additive genetic risk from five serotonin system polymorphisms interacts with interpersonal stress to predict depression. JOURNAL OF ABNORMAL PSYCHOLOGY 2016; 124:776-90. [PMID: 26595467 DOI: 10.1037/abn0000098] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Behavioral genetic research supports polygenic models of depression in which many genetic variations each contribute a small amount of risk, and prevailing diathesis-stress models suggest gene-environment interactions (G×E). Multilocus profile scores of additive risk offer an approach that is consistent with polygenic models of depression risk. In a first demonstration of this approach in a G×E predicting depression, we created an additive multilocus profile score from 5 serotonin system polymorphisms (1 each in the genes HTR1A, HTR2A, HTR2C, and 2 in TPH2). Analyses focused on 2 forms of interpersonal stress as environmental risk factors. Using 5 years of longitudinal diagnostic and life stress interviews from 387 emerging young adults in the Youth Emotion Project, survival analyses show that this multilocus profile score interacts with major interpersonal stressful life events to predict major depressive episode onsets (hazard ratio [HR] = 1.815, p = .007). Simultaneously, there was a significant protective effect of the profile score without a recent event (HR = 0.83, p = .030). The G×E effect with interpersonal chronic stress was not significant (HR = 1.15, p = .165). Finally, effect sizes for genetic factors examined ignoring stress suggested such an approach could lead to overlooking or misinterpreting genetic effects. Both the G×E effect and the protective simple main effect were replicated in a sample of early adolescent girls (N = 105). We discuss potential benefits of the multilocus genetic profile score approach and caveats for future research.
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Affiliation(s)
| | | | - Susan Mineka
- Department of Psychology, Northwestern University
| | | | - Emma K Adam
- School of Education and Social Policy and Cells to Society Center, Institute for Policy Research, Northwestern University
| | - Eva E Redei
- Department of Psychiatry and Behavioral Sciences, Feinberg School of Medicine, Northwestern University
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161
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Vindas MA, Madaro A, Fraser TWK, Höglund E, Olsen RE, Øverli Ø, Kristiansen TS. Coping with a changing environment: the effects of early life stress. ROYAL SOCIETY OPEN SCIENCE 2016; 3:160382. [PMID: 27853554 PMCID: PMC5098979 DOI: 10.1098/rsos.160382] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Accepted: 09/01/2016] [Indexed: 05/13/2023]
Abstract
Ongoing rapid domestication of Atlantic salmon implies that individuals are subjected to evolutionarily novel stressors encountered under conditions of artificial rearing, requiring new levels and directions of flexibility in physiological and behavioural coping mechanisms. Phenotypic plasticity to environmental changes is particularly evident at early life stages. We investigated the performance of salmon, previously subjected to an unpredictable chronic stress (UCS) treatment at an early age (10 month old parr), over several months and life stages. The UCS fish showed overall higher specific growth rates compared with unstressed controls after smoltification, a particularly challenging life stage, and after seawater transfer. Furthermore, subjecting fish to acute stress at the end of the experiment, we found that UCS groups had an overall lower hypothalamic catecholaminergic and brain stem serotonergic response to stress compared with control groups. In addition, serotonergic activity was negatively correlated with final growth rates, which implies that serotonin responsive individuals have growth disadvantages. Altogether, our results may imply that a subdued monoaminergic response in stressful farming environments may be beneficial, because in such situations individuals may be able to reallocate energy from stress responses into other life processes, such as growth.
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Affiliation(s)
- Marco A. Vindas
- Uni Environment, Uni Research AS, Bergen, Norway
- Department of Biosciences, University of Oslo, Oslo, Norway
- Author for correspondence: Marco A. Vindas e-mail:
| | | | - Thomas W. K. Fraser
- Department of Production Animal and Clinical Sciences, Norwegian University of Life Sciences, Oslo, Norway
| | - Erik Höglund
- National Institute of Aquatic Resources, Technical University of Denmark, Hirtshals, Denmark
- Norwegian Institute for Water Research (NIVA), Oslo, Norway
| | - Rolf E. Olsen
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Øyvind Øverli
- Department of Food Safety and Infection Biology, Norwegian University of Life Sciences, Oslo, Norway
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162
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Iglesias S, Tomiello S, Schneebeli M, Stephan KE. Models of neuromodulation for computational psychiatry. WILEY INTERDISCIPLINARY REVIEWS. COGNITIVE SCIENCE 2016; 8. [PMID: 27653804 DOI: 10.1002/wcs.1420] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 07/22/2016] [Accepted: 08/09/2016] [Indexed: 12/28/2022]
Abstract
Psychiatry faces fundamental challenges: based on a syndrome-based nosology, it presently lacks clinical tests to infer on disease processes that cause symptoms of individual patients and must resort to trial-and-error treatment strategies. These challenges have fueled the recent emergence of a novel field-computational psychiatry-that strives for mathematical models of disease processes at physiological and computational (information processing) levels. This review is motivated by one particular goal of computational psychiatry: the development of 'computational assays' that can be applied to behavioral or neuroimaging data from individual patients and support differential diagnosis and guiding patient-specific treatment. Because the majority of available pharmacotherapeutic approaches in psychiatry target neuromodulatory transmitters, models that infer (patho)physiological and (patho)computational actions of different neuromodulatory transmitters are of central interest for computational psychiatry. This article reviews the (many) outstanding questions on the computational roles of neuromodulators (dopamine, acetylcholine, serotonin, and noradrenaline), outlines available evidence, and discusses promises and pitfalls in translating these findings to clinical applications. WIREs Cogn Sci 2017, 8:e1420. doi: 10.1002/wcs.1420 For further resources related to this article, please visit the WIREs website.
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Affiliation(s)
- Sandra Iglesias
- Translational Neuromodeling Unit (TNU), Institute for Biomedical Engineering, University of Zurich & Swiss Federal Institute of Technology (ETH Zurich), Zurich, Switzerland
| | - Sara Tomiello
- Translational Neuromodeling Unit (TNU), Institute for Biomedical Engineering, University of Zurich & Swiss Federal Institute of Technology (ETH Zurich), Zurich, Switzerland
| | - Maya Schneebeli
- Translational Neuromodeling Unit (TNU), Institute for Biomedical Engineering, University of Zurich & Swiss Federal Institute of Technology (ETH Zurich), Zurich, Switzerland
| | - Klaas E Stephan
- Translational Neuromodeling Unit (TNU), Institute for Biomedical Engineering, University of Zurich & Swiss Federal Institute of Technology (ETH Zurich), Zurich, Switzerland.,Wellcome Trust Centre for Neuroimaging, University College London, London, UK.,Max Planck Institute for Metabolism Research, Cologne, Germany
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163
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Effects of Creatine Monohydrate Augmentation on Brain Metabolic and Network Outcome Measures in Women With Major Depressive Disorder. Biol Psychiatry 2016; 80:439-447. [PMID: 26822799 DOI: 10.1016/j.biopsych.2015.11.027] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 11/11/2015] [Accepted: 11/29/2015] [Indexed: 12/27/2022]
Abstract
BACKGROUND Creatine monohydrate (creatine) augmentation has the potential to accelerate the clinical responses to and enhance the overall efficacy of selective serotonin reuptake inhibitor treatment in women with major depressive disorder (MDD). Although it has been suggested that creatine augmentation may involve the restoration of brain energy metabolism, the mechanisms underlying its antidepressant efficacy are unknown. METHODS In a randomized, double-blind, placebo-controlled trial, 52 women with MDD were assigned to receive either creatine augmentation or placebo augmentation of escitalopram; 34 subjects participated in multimodal neuroimaging assessments at baseline and week 8. Age-matched healthy women (n = 39) were also assessed twice at the same intervals. Metabolic and network outcomes were measured for changes in prefrontal N-acetylaspartate and changes in rich club hub connections of the structural brain network using proton magnetic resonance spectroscopy and diffusion tensor imaging, respectively. RESULTS We found MDD-related metabolic and network dysfunction at baseline. Improvement in depressive symptoms was greater in patients receiving creatine augmentation relative to placebo augmentation. After 8 weeks of treatment, prefrontal N-acetylaspartate levels increased significantly in the creatine augmentation group compared with the placebo augmentation group. Increment in rich club hub connections was also greater in the creatine augmentation group than in the placebo augmentation group. CONCLUSIONS N-acetylaspartate levels and rich club connections increased after creatine augmentation of selective serotonin reuptake inhibitor treatment. Effects of creatine administration on brain energy metabolism and network organization may partly underlie its efficacy in treating women with MDD.
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164
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The efficacy and acceptability of psychological interventions for depression: where we are now and where we are going. Epidemiol Psychiatr Sci 2016; 25:295-300. [PMID: 26310321 PMCID: PMC7137599 DOI: 10.1017/s2045796015000748] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Depression is an eminently treatable disorder, although estimates of treatment efficacy have been inflated by publication bias. Patients with less severe depressions respond to even nonspecific interventions, whereas patients with more severe depressions require treatments that mobilize specific mechanisms. The cognitive and behavior therapies can be as efficacious as medications in the treatment of severe depression and have an enduring effect that medications lack. Medications may interfere with those enduring effects when added in combination and may prolong the life of the underlying episode when used alone. Thus the cognitive behavioral interventions might be the optimal first-line treatments for depression.
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165
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Harvey AG, Lee J, Smith RL, Gumport NB, Hollon SD, Rabe-Hesketh S, Hein K, Dolsen EA, Haman KL, Kanady JC, Thompson MA, Abrons D. Improving outcome for mental disorders by enhancing memory for treatment. Behav Res Ther 2016; 81:35-46. [PMID: 27089159 PMCID: PMC5559714 DOI: 10.1016/j.brat.2016.03.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Revised: 03/11/2016] [Accepted: 03/28/2016] [Indexed: 11/21/2022]
Abstract
Patients exhibit poor memory for treatment. A novel Memory Support Intervention, derived from basic science in cognitive psychology and education, is tested with the goal of improving patient memory for treatment and treatment outcome. Adults with major depressive disorder (MDD) were randomized to 14 sessions of cognitive therapy (CT)+Memory Support (n = 25) or CT-as-usual (n = 23). Outcomes were assessed at baseline, post-treatment and 6 months later. Memory support was greater in CT+Memory Support compared to the CT-as-usual. Compared to CT-as-usual, small to medium effect sizes were observed for recall of treatment points at post-treatment. There was no difference between the treatment arms on depression severity (primary outcome). However, the odds of meeting criteria for 'response' and 'remission' were higher in CT+Memory Support compared with CT-as-usual. CT+Memory Support also showed an advantage on functional impairment. While some decline was observed, the advantage of CT+Memory Support was evident through 6-month follow-up. Patients with less than 16 years of education experience greater benefits from memory support than those with 16 or more years of education. Memory support can be manipulated, may improve patient memory for treatment and may be associated with an improved outcome.
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Affiliation(s)
| | - Jason Lee
- University of California, Berkeley, CA, USA
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166
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Perinatal reduction of functional serotonin transporters results in developmental delay. Neuropharmacology 2016; 109:96-111. [PMID: 27208789 DOI: 10.1016/j.neuropharm.2016.05.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2015] [Revised: 03/25/2016] [Accepted: 05/17/2016] [Indexed: 11/22/2022]
Abstract
While there is strong evidence from rodent and human studies that a reduction in serotonin transporter (5-HTT) function in early-life can increase the risk for several neuropsychiatric disorders in adulthood, the effects of reduced 5-HTT function on behavior across developmental stages are underinvestigated. To elucidate how perinatal pharmacological and lifelong genetic inactivation of the 5-HTT affects behavior across development, we conducted a battery of behavioral tests in rats perinatally exposed to fluoxetine or vehicle and in 5-HTT(-/-) versus 5-HTT(+/+) rats. We measured motor-related behavior, olfactory function, grooming behavior, sensorimotor gating, object directed behavior and novel object recognition in the first three postnatal weeks and if possible the tests were repeated in adolescence and adulthood. We also measured developmental milestones such as eye opening, reflex development and body weight. We observed that both pharmacological and genetic inactivation of 5-HTT resulted in a developmental delay. Except for hypo-locomotion, most of the observed early-life effects were normalized later in life. In adolescence and adulthood we observed object directed behavior and decreased novel object recognition in the 5-HTT(-/-) rats, which might be related to the lifelong inactivation of 5-HTT. Together, these data provide an important contribution to the understanding of the effects of perinatal and lifelong 5-HTT inactivation on behavior across developmental stages.
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167
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Gururajan A, Clarke G, Dinan TG, Cryan JF. Molecular biomarkers of depression. Neurosci Biobehav Rev 2016; 64:101-33. [DOI: 10.1016/j.neubiorev.2016.02.011] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 01/11/2016] [Accepted: 02/12/2016] [Indexed: 12/22/2022]
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168
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Vindas MA, Johansen IB, Folkedal O, Höglund E, Gorissen M, Flik G, Kristiansen TS, Øverli Ø. Brain serotonergic activation in growth-stunted farmed salmon: adaption versus pathology. ROYAL SOCIETY OPEN SCIENCE 2016; 3:160030. [PMID: 27293782 PMCID: PMC4892444 DOI: 10.1098/rsos.160030] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 04/26/2016] [Indexed: 05/27/2023]
Abstract
Signalling systems activated under stress are highly conserved, suggesting adaptive effects of their function. Pathologies arising from continued activation of such systems may represent a mismatch between evolutionary programming and current environments. Here, we use Atlantic salmon (Salmo salar) in aquaculture as a model to explore this stance of evolutionary-based medicine, for which empirical evidence has been lacking. Growth-stunted (GS) farmed fish were characterized by elevated brain serotonergic activation, increased cortisol production and behavioural inhibition. We make the novel observation that the serotonergic system in GS fish is unresponsive to additional stressors, yet a cortisol response is maintained. The inability of the serotonergic system to respond to additional stress, while a cortisol response is present, probably leads to both imbalance in energy metabolism and attenuated neural plasticity. Hence, we propose that serotonin-mediated behavioural inhibition may have evolved in vertebrates to minimize stress exposure in vulnerable individuals.
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Affiliation(s)
- Marco A. Vindas
- Department of Biosciences, University of Oslo, PO Box 1041, Blindern, 0316 Oslo, Norway
- Uni Research AS, PO Box 7810, 5020 Bergen, Norway
| | - Ida B. Johansen
- Department of Biosciences, University of Oslo, PO Box 1041, Blindern, 0316 Oslo, Norway
- Bjørknes College, Oslo, Norway
| | - Ole Folkedal
- Institute of Marine Research, 5984 Matredal, Norway
| | - Erik Höglund
- National Institute of Aquatic Resources, Section for Aquaculture, Technical University of Denmark, North Sea Center, PO Box 101, 9850 Hirtshals, Denmark
| | - Marnix Gorissen
- Department of Organismal Animal Physiology, Radboud University, Institute for Water and Wetland Research, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
| | - Gert Flik
- Department of Organismal Animal Physiology, Radboud University, Institute for Water and Wetland Research, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
| | | | - Øyvind Øverli
- Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, PO Box 5003, 1432 Ås, Norway
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169
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Van Assche E, Moons T, Van Leeuwen K, Colpin H, Verschueren K, Van Den Noortgate W, Goossens L, Claes S. Depressive symptoms in adolescence: The role of perceived parental support, psychological control, and proactive control in interaction with 5-HTTLPR. Eur Psychiatry 2016; 35:55-63. [PMID: 27077378 DOI: 10.1016/j.eurpsy.2016.01.2428] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 01/28/2016] [Accepted: 01/30/2016] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND Parenting dimensions are associated with depressive symptoms in adolescents. We investigated the role of perceived parenting dimensions and gene-environment interactions between these perceived parenting dimensions and five well-known variable number of tandem repeats (VNTRs): 5-HTTLPR, STin2, DAT1, DRD4, and MAO-A, in depressive symptoms. METHODS From a non-clinical sample of 1111 Belgian adolescents (mean age: 13.79 years, SD=.94; 51% boys), 1103 adolescents consented for genetic research. Five VNTRs were analyzed using DNA from saliva samples. Perceived parenting dimensions (i.e., support, proactive control, psychological control, punishment, and harsh punishment) were examined using self-report scales completed by adolescents and their parents. Depressive symptoms were investigated using the CES-D self-report scale. Statistical analyses were performed in R using linear regression. RESULTS Parental support, as perceived by the adolescent, was negatively associated with depressive symptoms (CES-D) and psychological control was positively associated with these symptoms. The only interaction effect withstanding correction for multiple testing was observed for 5-HTTLPR and the difference in proactive control as perceived by adolescents in comparison to parents. Short-allele carriers showed more depressive symptoms when there was a higher discrepancy in proactive control as perceived by adolescents versus parents. CONCLUSIONS Our results suggest that perceived parenting dimensions are associated with depressive symptoms, as measured by the CES-D. We only found modest evidence for 5-HTTLPR as a moderator in the association between the difference in perception of proactive control (adolescents vs. parents) and depressive symptoms.
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Affiliation(s)
- E Van Assche
- GRASP-Research Group, Department of Neuroscience, University of Leuven, Leuven, Belgium; University Psychiatric Center KU Leuven, Leuven, Belgium.
| | - T Moons
- GRASP-Research Group, Department of Neuroscience, University of Leuven, Leuven, Belgium; OPZ Geel, Dr. Sanodreef 4, Geel, Belgium
| | - K Van Leeuwen
- Department of Parenting and Special Education, Faculty of Psychology and Educational Sciences, University of Leuven, Leuven, Belgium
| | - H Colpin
- Department of School Psychology and Child and Adolescent Development, Faculty of Psychology and Educational Sciences, University of Leuven, Leuven, Belgium
| | - K Verschueren
- Department of School Psychology and Child and Adolescent Development, Faculty of Psychology and Educational Sciences, University of Leuven, Leuven, Belgium
| | - W Van Den Noortgate
- Department of Methodology of Educational Sciences, Faculty of Psychology and Educational Sciences, University of Leuven, Leuven, Belgium
| | - L Goossens
- Department of School Psychology and Child and Adolescent Development, Faculty of Psychology and Educational Sciences, University of Leuven, Leuven, Belgium
| | - S Claes
- GRASP-Research Group, Department of Neuroscience, University of Leuven, Leuven, Belgium; University Psychiatric Center KU Leuven, Leuven, Belgium
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170
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Malan L, Hamer M, von Känel R, Schlaich MP, Reimann M, Frasure-Smith N, Lambert GW, Vilser W, Harvey BH, Steyn F, Malan NT. Chronic depression symptoms and salivary NOx are associated with retinal vascular dysregulation: The SABPA study. Nitric Oxide 2016; 55-56:10-7. [PMID: 26945470 DOI: 10.1016/j.niox.2016.02.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 02/03/2016] [Accepted: 02/29/2016] [Indexed: 11/25/2022]
Abstract
BACKGROUND Depression has been associated with impaired nitric oxide (NO)-mediated vasodilation and vascular dysregulation (VD). Whether depression and NO levels will disturb retinal haemodynamics is not clear. OBJECTIVES AND METHODS Associations between the retinal vasculature, diastolic ocular perfusion pressure (DOPP) as measure of hypoperfusion, NO metabolites (NOx) and depression symptoms were assessed. Chronic VD risk markers [depression symptoms (Patient Health Questionnaire/PHQ-9 ≥ 10) and 24 h pulse pressure] were determined in a bi-ethnic cohort (n = 313; 48.6 ± 9 years; 53.9% men). At 3 year follow-up, retinal vessel calibre and retinopathy signs were quantified from digital images. Salivary NOx was obtained pre- and post-flicker light-induced provocation (FLIP). DOPP was defined as diastolic blood pressure minus intraocular pressure. RESULTS Chronic VD risk was evident in Blacks opposed to acute risk in Whites (P < 0.05). At follow-up, retinopathy (Blacks 60.4%/Whites 39.6%), lower pre-FLIP (μM) and higher post-FLIP NOx (changes from baseline, %), arteriolar narrowing and wider venular calibre values were evident in Blacks compared to Whites, independent of confounders. A wider venular calibre, an index of stroke risk, was associated with chronic depression symptoms [cut point 248 MU: Area under the curve 0.61 (95% CI: 0.51, 0.72); 71% sensitivity; 55% specificity] as well as with hypoperfusion in the Blacks. In this group, arteriolar narrowing was associated with hypoperfusion; and attenuated arteriolar dilation with increased post-FLIP NOx responses. CONCLUSIONS Chronic depression symptoms may alter NO regulation and facilitate VD. NO-mediated vasoconstriction presumably impeded perfusion, retinal haemodynamics and -remodelling; potentiating stroke risk in Blacks.
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Affiliation(s)
- Leoné Malan
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, South Africa.
| | - Mark Hamer
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, South Africa; National Centre for Sport and Exercise Medicine, Loughborough University, Leicestershire, United Kingdom
| | - Roland von Känel
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, South Africa; Department Neurology, Inselspital, Bern University Hospital, University of Bern, Switzerland
| | - Markus P Schlaich
- School of Medicine and Pharmacology-Royal Perth Hospital Unit, Faculty of Medicine, Dentistry & Health Sciences, University Western Australia, Australia
| | - Manja Reimann
- Autonomic and Neuroendocrinological Laboratory Dresden, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany
| | - Nancy Frasure-Smith
- Department of Psychiatry and School of Nursing, McGill University, Department of Psychiatry, University of Montreal, Centre de recherche Centre hospitalier de l'Université de Montréal and Montreal Heart Institute Research Center, Canada
| | - Gavin W Lambert
- Baker IDI Heart & Diabetes Institute and Central Clinical School, Monash University, Melbourne, Australia
| | | | - Brian H Harvey
- Center of Excellence for Pharmaceutical Sciences, Division of Pharmacology, School for Pharmacy, North-West University, Potchefstroom Campus, South Africa
| | - Faans Steyn
- Statistical Consultation Services, North-West University, Potchefstroom, South Africa
| | - Nico T Malan
- Hypertension in Africa Research Team (HART), North-West University, Potchefstroom, South Africa
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Not only serotonergic system, but also dopaminergic system involved in albiflorin against chronic unpredictable mild stress-induced depression-like behavior in rats. Chem Biol Interact 2015; 242:211-7. [DOI: 10.1016/j.cbi.2015.10.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Revised: 09/25/2015] [Accepted: 10/05/2015] [Indexed: 02/02/2023]
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172
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Li X, Fan Y, Xiao S, Peng S, Dong X, Zheng X, Liu CC, Li H, Xiao Z. Decreased platelet 5-hydroxytryptamin (5-HT) levels: a response to antidepressants. J Affect Disord 2015; 187:84-90. [PMID: 26321259 DOI: 10.1016/j.jad.2015.08.025] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Revised: 08/09/2015] [Accepted: 08/12/2015] [Indexed: 12/14/2022]
Abstract
BACKGROUND Platelet 5-hydroxytryptamin (serotonin, 5-HT) has been examined for its use as a peripheral biomarker for depression or other mental disorders; however, it remains unclear whether blood 5-HT levels can reflect the brain's levels of serotonin. METHODS Platelet 5-HT levels in 45 drug-naïve, 32 citalopram-treated patients with major depression and 32 healthy control were assayed, Hamilton Depression scale (HAMD) and Hamilton Anxiety Scale (HAMA) were assessed. We then measured 5-HT in platelet, in platelet-poor plasma and in the nuclei of brain tissues obtained from chronic unpredictable mild stress (CUMS) rats with or without citalopram treatment, and from the controls rats that were treated with vehicle. Toward this end, we analyzed whether correlations exist between platelet and brain. RESULTS No differences were observed among drug-naïve patients, citalopram-treated patients and health control according to gender and age (p>0.05). Drug-naïve depressed patients had highest scores in HAMD and HAMA among the three groups (F=223.3, p<0.01; F=70.7, p<0.01, respectively) Citalopram-treated patients had significantly lower platelet 5-HT levels,compared to control subjects (Mean 58.1±36.8ng/10(9) versus 558.0±199.4ng/10(9), p<0.01) and compared to drug-naïve patients (Mean 58.1 ±36.8ng/10(9) versus 646.4±259.0ng/10(9), p<0.01), while drug-naïve patients had similar 5-HT platelet concentrations as controls(p>0.05). Consistent with clinical results, in comparison with control (1473.4±391.0ng/10(9)) and drug-naive CUMS rats (1559.0±424.4ng/10(9)), the citalopram-treated CUMS rats (684.2±335.6ng/10(9)) demonstrated a significant reduction in platelet 5-HT levels (p<0.01), but there were no difference among the three groups in platelet-poor plasma 5-HT(F=0.11, p>0.05). Hippocampal 5-HT levels were higher among CUMS rats treated with saline (98.2±59.0ng/g) than vehicle animals (31.9±18.3ng/g, p<0.01) or citalopram-treated rats (42.1±33.9ng/g, p<0.05); however, 5-HT concentrations in prefrontal cortex and Raphe Nuclei were consistent among citalopram-treated or saline-treated CUMS rats(p>0.05). Furthermore, the levels of platelet 5-HT did not correlate with neuronal 5-HT levels (p>0.05). LIMITATIONS Dosages was fix for citalopram-treat rats, and the citalopram-treated vehicle arm did not set up. CONCLUSIONS Our study suggests that platelet 5-HT levels might respond to SSRI treatment, but this peripheral index is not a direct reflector of central 5-HT levels.
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Affiliation(s)
- Xia Li
- Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, 600 Wan Ping Nan Road, Shanghai 200030, China
| | - Yuan Fan
- Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, 600 Wan Ping Nan Road, Shanghai 200030, China
| | - Shifu Xiao
- Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, 600 Wan Ping Nan Road, Shanghai 200030, China
| | - Sufang Peng
- Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, 600 Wan Ping Nan Road, Shanghai 200030, China
| | - Xiaowei Dong
- Brain Function Research Laboratory, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Xianjie Zheng
- Brain Function Research Laboratory, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Chia-Chen Liu
- Department of Neuroscience, Mayo Clinic, Jacksonville FL 32224, USA
| | - Huafang Li
- Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, 600 Wan Ping Nan Road, Shanghai 200030, China.
| | - Zeping Xiao
- Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, 600 Wan Ping Nan Road, Shanghai 200030, China.
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Liu Y, Yang L, Yu J, Zhang YQ. Persistent, comorbid pain and anxiety can be uncoupled in a mouse model. Physiol Behav 2015; 151:55-63. [DOI: 10.1016/j.physbeh.2015.07.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Revised: 07/03/2015] [Accepted: 07/05/2015] [Indexed: 01/26/2023]
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