51
|
Majdak P, Grogan EL, Gogola JV, Sorokina A, Tse S, Rhodes JS. The impact of maternal neglect on genetic hyperactivity. Behav Brain Res 2016; 313:282-292. [PMID: 27449202 DOI: 10.1016/j.bbr.2016.07.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Revised: 07/14/2016] [Accepted: 07/18/2016] [Indexed: 10/21/2022]
Abstract
Early environmental conditions are increasingly appreciated as critical in shaping behavior and cognition. Evidence suggests that stressful rearing environments can have an enduring impact on behaviors in adulthood, but few studies have explored the possibility that rearing environment could exacerbate genetic hyperactivity disorders. Uncovering a strong environmental influence on the transmission of hyperactivity could provide novel avenues for translational research. Recently we developed a selectively bred High-Active line of mice to model ADHD, providing a unique resource to address the question of environmental transmission. The High-Active line demonstrates transgenerational hyperactivity, but the influence of the postnatal environment (i.e. maternal care provided by dams) on hyperactivity had not been systemically quantified. This study employed a cross-fostering method to simultaneously address 1) whether High-Active and Control pups are provided with similar levels of care in the early environment, and 2) whether any differences in rearing environment influence hyperactive behavior. High-Active dams demonstrated impairment in all measures of maternal competence relative to Controls, which reduced survival rates and significantly reduced the body mass of offspring in early life and at weaning. While the deteriorated postnatal environment provided by High-Active dams was ultimately sufficient to depress Control activity, the hyperactivity of High-Active offspring remained unaffected by fostering condition. These data not only confirm the power of genetics to influence hyperactivity across generations, but also provide evidence that early rearing environments may not have a significant impact on the extreme end of hyperactive phenotypes.
Collapse
Affiliation(s)
- Petra Majdak
- The Neuroscience Program, University of Illinois, 405 North Mathews Avenue, Urbana, IL 61801, USA; The Beckman Institute for Advanced Science and Technology, University of Illinois, 405 North Mathews Avenue, Urbana, IL 61801, USA.
| | - Elizabeth L Grogan
- The Beckman Institute for Advanced Science and Technology, University of Illinois, 405 North Mathews Avenue, Urbana, IL 61801, USA
| | - Joseph V Gogola
- The Beckman Institute for Advanced Science and Technology, University of Illinois, 405 North Mathews Avenue, Urbana, IL 61801, USA
| | - Anastassia Sorokina
- The Beckman Institute for Advanced Science and Technology, University of Illinois, 405 North Mathews Avenue, Urbana, IL 61801, USA
| | - Stephen Tse
- The Beckman Institute for Advanced Science and Technology, University of Illinois, 405 North Mathews Avenue, Urbana, IL 61801, USA
| | - Justin S Rhodes
- The Neuroscience Program, University of Illinois, 405 North Mathews Avenue, Urbana, IL 61801, USA; The Beckman Institute for Advanced Science and Technology, University of Illinois, 405 North Mathews Avenue, Urbana, IL 61801, USA; Department of Psychology, University of Illinois, 603 E. Daniel Street, Champaign, IL 61820, USA
| |
Collapse
|
52
|
Adolescent mice show anxiety- and aggressive-like behavior and the reduction of long-term potentiation in mossy fiber-CA3 synapses after neonatal maternal separation. Neuroscience 2016; 316:221-31. [DOI: 10.1016/j.neuroscience.2015.12.041] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 12/05/2015] [Accepted: 12/21/2015] [Indexed: 11/17/2022]
|
53
|
Gracia-Rubio I, Moscoso-Castro M, Pozo OJ, Marcos J, Nadal R, Valverde O. Maternal separation induces neuroinflammation and long-lasting emotional alterations in mice. Prog Neuropsychopharmacol Biol Psychiatry 2016; 65:104-17. [PMID: 26382758 DOI: 10.1016/j.pnpbp.2015.09.003] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Revised: 08/31/2015] [Accepted: 09/07/2015] [Indexed: 12/27/2022]
Abstract
Early life experiences play a key role in brain function and behaviour. Adverse events during childhood are therefore a risk factor for psychiatric disease during adulthood, such as mood disorders. Maternal separation is a validated mouse model for maternal neglect, producing negative early life experiences that result in subsequent emotional alteration. Mood disorders have been found to be associated with neurochemical changes and neurotransmitter deficits such as reduced availability of monoamines in discrete brain areas. Emotional alterations like depression result in reduced serotonin availability and enhanced kynurenine metabolism through the action of indoleamine 2, 3-dioxygenase in response to neuroinflammatory factors. This mechanism involves regulation of the neurotransmitter system by neuroinflammatory agents, linking mood regulation to neuroinmunological reactions. In this context, the aim of this study was to investigate the effects of maternal separation with early weaning on emotional behaviour in mice. We investigated neuroinflammatory responses and the state of the tryptophan-kynurenine metabolic pathway in discrete brain areas following maternal separation. We show that adverse events during early life increase risk of long-lasting emotional alterations during adolescence and adulthood. These emotional alterations are particularly severe in females. Behavioural impairments were associated with microglia activation and disturbed tryptophan-kynurenine metabolism in brain areas related to emotional control. This finding supports the preeminent role of neuroinflammation in emotional disorders.
Collapse
Affiliation(s)
- Irene Gracia-Rubio
- Neurobiology of Behavior Research Group (GReNeC), Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain
| | - Maria Moscoso-Castro
- Neurobiology of Behavior Research Group (GReNeC), Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain
| | - Oscar J Pozo
- Bioanalysis Research Group, IMIM (Hospital del Mar Research Institute), Barcelona, Spain
| | - Josep Marcos
- Bioanalysis Research Group, IMIM (Hospital del Mar Research Institute), Barcelona, Spain; Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain
| | - Roser Nadal
- Institut de Neurociències and Psychobiology Unit, Universitat Autònoma de Barcelona, Spain
| | - Olga Valverde
- Neurobiology of Behavior Research Group (GReNeC), Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain; Neuroscience Research Program, IMIM (Hospital del Mar Research Institute) Barcelona, Spain.
| |
Collapse
|
54
|
Neuroligin-2 Expression in the Prefrontal Cortex is Involved in Attention Deficits Induced by Peripubertal Stress. Neuropsychopharmacology 2016; 41:751-61. [PMID: 26152839 PMCID: PMC4707821 DOI: 10.1038/npp.2015.200] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Revised: 06/28/2015] [Accepted: 06/28/2015] [Indexed: 12/11/2022]
Abstract
Emerging evidence indicates that attention deficits, which are frequently observed as core symptoms of neuropsychiatric disorders, may be elicited by early life stress. However, the mechanisms mediating these stress effects remain unknown. The prefrontal cortex (PFC) has been implicated in the regulation of attention, including dysfunctions in GABAergic transmission, and it is highly sensitive to stress. Here, we investigated the involvement of neuroligin-2 (NLGN-2), a synaptic cell adhesion molecule involved in the stabilization and maturation of GABAergic synapses, in the PFC in the link between stress and attention deficits. First, we established that exposure of rats to stress during the peripubertal period impairs attention in the five-choice serial reaction time task and results in reductions in the GABA-synthesizing enzyme glutamic acid decarboxylase in different PFC subregions (ie, prelimbic (PL), infralimbic, and medial and ventral orbitofrontal (OFC) cortex) and in NLGN-2 in the PL cortex. In peripubertally stressed animals, NLGN-2 expression in the PL and OFC cortex correlated with attention measurements. Subsequently, we found that adeno-associated virus-induced rescue of NLGN-2 in the PFC reverses the stress-induced attention deficits regarding omitted trials. Therefore, our findings highlight peripuberty as a period that is highly vulnerable to stress, leading to the development of attention deficits and a dysfunction in the PFC GABAergic system and NLGN-2 expression. Furthermore, NLGN-2 is underscored as a promising target to treat stress-induced cognitive alterations, and in particular attentional deficits as manifested by augmented omissions in a continuous performance task.
Collapse
|
55
|
Montalvo-Ortiz JL, Gelernter J, Hudziak J, Kaufman J. RDoC and translational perspectives on the genetics of trauma-related psychiatric disorders. Am J Med Genet B Neuropsychiatr Genet 2016; 171B:81-91. [PMID: 26592203 PMCID: PMC4754782 DOI: 10.1002/ajmg.b.32395] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 10/09/2015] [Indexed: 01/01/2023]
Abstract
Individuals with a history of child abuse are at high risk for depression, anxiety disorders, aggressive behavior, and substance use problems. The goal of this paper is to review studies of the genetics of these stress-related psychiatric disorders. An informative subset of studies that examined candidate gene by environment (GxE) predictors of these psychiatric problems in individuals maltreated as children is reviewed, together with extant genome wide association studies (GWAS). Emerging findings on epigenetic changes associated with adverse early experiences are also reviewed. Meta-analytic support and replicated findings are evident for several genetic risk factors; however, extant research suggests the effects are pleiotropic. Genetic factors are not associated with distinct psychiatric disorders, but rather diverse clinical phenotypes. Research also suggests adverse early life experiences are associated with changes in gene expression of multiple known candidate genes, genes involved in DNA transcription and translation, and genes necessary for brain circuitry development, with changes in gene expression reported in key brain structures implicated in the pathophysiology of psychiatric and substance use disorders. The finding of pleiotropy highlights the value of using the Research Domain Criteria (RDoC) framework in future studies of the genetics of stress-related psychiatric disorders, and not trying simply to link genes to multifaceted clinical syndromes, but to more limited phenotypes that map onto distinct neural circuits. Emerging work in the field of epigenetics also suggests that translational studies that integrate numerous unbiased genome-wide approaches will help to further unravel the genetics of stress-related psychiatric disorders.
Collapse
Affiliation(s)
| | - Joel Gelernter
- Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut,Veteran's Administration Connecticut Health Care Center, Newington, Connecticut
| | - James Hudziak
- Vermont Center for Children, Youth, and Families, University of Vermont, Burlington, Vermont
| | - Joan Kaufman
- Center for Child and Family Traumatic Stress, Kennedy Krieger Institute, Baltimore, Maryland,Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of Medicine, Baltimore, Maryland,Correspondence to: Joan Kaufman, Ph.D., Center for Child and Family Traumatic Stress, Kennedy Krieger Institute, 1750 East Fairmont Street, Baltimore, MD 21231.
| |
Collapse
|
56
|
Takita M, Kikusui T. Early weaning influences short-term synaptic plasticity in the medial prefrontal-anterior basolateral amygdala pathway. Neurosci Res 2015; 103:48-53. [PMID: 26325007 DOI: 10.1016/j.neures.2015.08.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 07/31/2015] [Accepted: 08/14/2015] [Indexed: 01/01/2023]
Abstract
Early weaning in rodents reportedly influences behavioral and emotional traits and triggers precocious myelin formation in the anterior basolateral amygdala (aBLA; Ono et al., 2008), where prefrontal efferents terminate. We studied the correlation between behavior and the synaptic properties of the prefrontal-aBLA pathway. Open-field behaviors of adult male rats weaned at either 16 days or 30 days were measured on two consecutive days. On the first day, the rats received a slight footshock that was reportedly insufficient for fear conditioning. Electrophysiological recordings in the prefrontal-aBLA were then performed under urethane anesthesia. Without group differences in the stimulus intensity or the first evoked response, the overall paired-pulse facilitation was significantly lower in the early-weaned group from 25 to 100 ms. At the 25-ms interval, regression values between paired-pulse facilitation and locomotion on the second day were positive/insignificant and negative/significant in early- and control-weaned groups, respectively, and were statistically different between the groups.
Collapse
Affiliation(s)
- Masatoshi Takita
- Brain Function Measurement Research Group, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Japan; Brain Science Inspired Life Support Research Center, The University of Electro-Communications, Tokyo, Japan.
| | - Takefumi Kikusui
- Department of Animal Science and Biotechnology, Azabu University, Kanagawa, Japan
| |
Collapse
|
57
|
Galinowski A, Miranda R, Lemaitre H, Paillère Martinot ML, Artiges E, Vulser H, Goodman R, Penttilä J, Struve M, Barbot A, Fadai T, Poustka L, Conrod P, Banaschewski T, Barker GJ, Bokde A, Bromberg U, Büchel C, Flor H, Gallinat J, Garavan H, Heinz A, Ittermann B, Kappel V, Lawrence C, Loth E, Mann K, Nees F, Paus T, Pausova Z, Poline JB, Rietschel M, Robbins TW, Smolka M, Schumann G, Martinot JL. Resilience and corpus callosum microstructure in adolescence. Psychol Med 2015; 45:2285-2294. [PMID: 25817177 DOI: 10.1017/s0033291715000239] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND Resilience is the capacity of individuals to resist mental disorders despite exposure to stress. Little is known about its neural underpinnings. The putative variation of white-matter microstructure with resilience in adolescence, a critical period for brain maturation and onset of high-prevalence mental disorders, has not been assessed by diffusion tensor imaging (DTI). Lower fractional anisotropy (FA) though, has been reported in the corpus callosum (CC), the brain's largest white-matter structure, in psychiatric and stress-related conditions. We hypothesized that higher FA in the CC would characterize stress-resilient adolescents. METHOD Three groups of adolescents recruited from the community were compared: resilient with low risk of mental disorder despite high exposure to lifetime stress (n = 55), at-risk of mental disorder exposed to the same level of stress (n = 68), and controls (n = 123). Personality was assessed by the NEO-Five Factor Inventory (NEO-FFI). Voxelwise statistics of DTI values in CC were obtained using tract-based spatial statistics. Regional projections were identified by probabilistic tractography. RESULTS Higher FA values were detected in the anterior CC of resilient compared to both non-resilient and control adolescents. FA values varied according to resilience capacity. Seed regional changes in anterior CC projected onto anterior cingulate and frontal cortex. Neuroticism and three other NEO-FFI factor scores differentiated non-resilient participants from the other two groups. CONCLUSION High FA was detected in resilient adolescents in an anterior CC region projecting to frontal areas subserving cognitive resources. Psychiatric risk was associated with personality characteristics. Resilience in adolescence may be related to white-matter microstructure.
Collapse
Affiliation(s)
- A Galinowski
- INSERM,UMR 1000,Research unit Imaging and Psychiatry,Service Hospitalier Frédéric Joliot,Orsay,France
| | - R Miranda
- INSERM,UMR 1000,Research unit Imaging and Psychiatry,Service Hospitalier Frédéric Joliot,Orsay,France
| | - H Lemaitre
- INSERM,UMR 1000,Research unit Imaging and Psychiatry,Service Hospitalier Frédéric Joliot,Orsay,France
| | - M-L Paillère Martinot
- INSERM,UMR 1000,Research unit Imaging and Psychiatry,Service Hospitalier Frédéric Joliot,Orsay,France
| | - E Artiges
- INSERM,UMR 1000,Research unit Imaging and Psychiatry,Service Hospitalier Frédéric Joliot,Orsay,France
| | - H Vulser
- INSERM,UMR 1000,Research unit Imaging and Psychiatry,Service Hospitalier Frédéric Joliot,Orsay,France
| | - R Goodman
- King's College, London Institute of Psychiatry,London,UK
| | - J Penttilä
- Psychiatry Department,University of Tampere,School of Medicine, Tampere,Finland
| | - M Struve
- Department of Cognitive and Clinical Neuroscience,Central Institute of Mental Health,Medical Faculty Mannheim/Heidelberg University,Germany
| | | | - T Fadai
- Universitaetsklinikum Hamburg Eppendorf,Hamburg,Germany
| | - L Poustka
- Department of Child and Adolescent Psychiatry and Psychotherapy,Central Institute of Mental Health,Medical Faculty Mannheim/Heidelberg University,Germany
| | - P Conrod
- King's College, London Institute of Psychiatry,London,UK
| | - T Banaschewski
- Department of Cognitive and Clinical Neuroscience,Central Institute of Mental Health,Medical Faculty Mannheim/Heidelberg University,Germany
| | - G J Barker
- King's College, London Institute of Psychiatry,London,UK
| | - A Bokde
- Institute of Neuroscience and Department of Psychiatry,School of Medicine,Trinity College Dublin,Dublin,Ireland
| | - U Bromberg
- Universitaetsklinikum Hamburg Eppendorf,Hamburg,Germany
| | - C Büchel
- Universitaetsklinikum Hamburg Eppendorf,Hamburg,Germany
| | - H Flor
- Department of Cognitive and Clinical Neuroscience,Central Institute of Mental Health,Medical Faculty Mannheim/Heidelberg University,Germany
| | - J Gallinat
- Department of Psychiatry and Psychotherapy,Campus Charité Mitte,Charité-Universitätsmedizin,Berlin,Germany
| | - H Garavan
- Institute of Neuroscience,Trinity College Dublin,Dublin,Ireland
| | - A Heinz
- Department of Psychiatry and Psychotherapy,Campus Charité Mitte,Charité-Universitätsmedizin,Berlin,Germany
| | - B Ittermann
- Physikalisch-Technische Bundesanstalt (PTB),Braunschweig und Berlin,Germany
| | - V Kappel
- Department of Child and Adolescent Psychiatry,Psychosomatics and Psychotherapy,Charité-Universitätsmedizin,Berlin,Germany
| | - C Lawrence
- School of Psychology,University of Nottingham,UK
| | - E Loth
- King's College, London Institute of Psychiatry,London,UK
| | - K Mann
- Department of Cognitive and Clinical Neuroscience,Central Institute of Mental Health,Medical Faculty Mannheim/Heidelberg University,Germany
| | - F Nees
- Department of Child and Adolescent Psychiatry and Psychotherapy,Central Institute of Mental Health,Medical Faculty Mannheim/Heidelberg University,Germany
| | - T Paus
- School of Psychology,University of Nottingham,UK
| | - Z Pausova
- Department of Physiology and Nutritional Sciences,The Hospital for Sick Children,University of Toronto,Toronto, ONT,Canada
| | | | - M Rietschel
- Department of Cognitive and Clinical Neuroscience,Central Institute of Mental Health,Medical Faculty Mannheim/Heidelberg University,Germany
| | - T W Robbins
- Department of Experimental Psychology,Behavioural and Clinical Neurosciences Institute,University of Cambridge,UK
| | - M Smolka
- Department of Psychiatry and Psychotherapy,Technische Universität Dresden,Germany
| | - G Schumann
- King's College, London Institute of Psychiatry,London,UK
| | - J-L Martinot
- INSERM,UMR 1000,Research unit Imaging and Psychiatry,Service Hospitalier Frédéric Joliot,Orsay,France
| |
Collapse
|
58
|
Wei L, Hao J, Lacher RK, Abbott T, Chung L, Colangelo CM, Kaffman A. Early-Life Stress Perturbs Key Cellular Programs in the Developing Mouse Hippocampus. Dev Neurosci 2015; 37:476-88. [PMID: 26068561 DOI: 10.1159/000430861] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 04/21/2015] [Indexed: 01/07/2023] Open
Abstract
Conflicting reports are available with regard to the effects of childhood abuse and neglect on hippocampal function in children. While earlier imaging studies and some animal work have suggested that the effects of early-life stress (ELS) manifest only in adulthood, more recent studies have documented impaired hippocampal function in maltreated children and adolescents. Additional work using animal modes is needed to clarify the effects of ELS on hippocampal development. In this regard, genomic, proteomic, and molecular tools uniquely available in the mouse make it a particularly attractive model system to study this issue. However, very little work has been done so far to characterize the effects of ELS on hippocampal development in the mouse. To address this issue, we examined the effects of brief daily separation (BDS), a mouse model of ELS that impairs hippocampal-dependent memory in adulthood, on hippocampal development in 28-day-old juvenile mice. This age was chosen because it corresponds to the developmental period in which human imaging studies have revealed abnormal hippocampal development in maltreated children. Exposure to BDS caused a significant decrease in the total protein content of synaptosomes harvested from the hippocampus of 28-day-old male and female mice, suggesting that BDS impairs normal synaptic development in the juvenile hippocampus. Using a novel liquid chromatography multiple reaction monitoring mass spectrometry (LC-MRM) assay, we found decreased expression of many synaptic proteins, as well as proteins involved in axonal growth, myelination, and mitochondrial activity. Golgi staining in 28-day-old BDS mice showed an increase in the number of immature and abnormally shaped spines and a decrease in the number of mature spines in CA1 neurons, consistent with defects in synaptic maturation and synaptic pruning at this age. In 14-day-old pups, BDS deceased the expression of proteins involved in axonal growth and myelination, but did not affect the total protein content of synaptosomes harvested from the hippocampus, or protein levels of other synaptic markers. These results add two important findings to previous work in the field. First, our findings demonstrate that in 28-day-old juvenile mice, BDS impairs synaptic maturation and reduces the expression of proteins that are necessary for axonal growth, myelination, and mitochondrial function. Second, the results suggest a sequential model in which BDS impairs normal axonal growth and myelination before it disrupts synaptic maturation in the juvenile hippocampus.
Collapse
Affiliation(s)
- Lan Wei
- Department of Psychiatry, Yale University School of Medicine, New Haven, Conn., USA
| | | | | | | | | | | | | |
Collapse
|
59
|
Bridgett DJ, Burt NM, Edwards ES, Deater-Deckard K. Intergenerational transmission of self-regulation: A multidisciplinary review and integrative conceptual framework. Psychol Bull 2015; 141:602-654. [PMID: 25938878 PMCID: PMC4422221 DOI: 10.1037/a0038662] [Citation(s) in RCA: 313] [Impact Index Per Article: 34.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This review examines mechanisms contributing to the intergenerational transmission of self-regulation. To provide an integrated account of how self-regulation is transmitted across generations, we draw from over 75 years of accumulated evidence, spanning case studies to experimental approaches, in literatures covering developmental, social, and clinical psychology, and criminology, physiology, genetics, and human and animal neuroscience (among others). First, we present a taxonomy of what self-regulation is and then examine how it develops--overviews that guide the main foci of the review. Next, studies supporting an association between parent and child self-regulation are reviewed. Subsequently, literature that considers potential social mechanisms of transmission, specifically parenting behavior, interparental (i.e., marital) relationship behaviors, and broader rearing influences (e.g., household chaos) is considered. Finally, evidence that prenatal programming may be the starting point of the intergenerational transmission of self-regulation is covered, along with key findings from the behavioral and molecular genetics literatures. To integrate these literatures, we introduce the self-regulation intergenerational transmission model, a framework that brings together prenatal, social/contextual, and neurobiological mechanisms (spanning endocrine, neural, and genetic levels, including gene-environment interplay and epigenetic processes) to explain the intergenerational transmission of self-regulation. This model also incorporates potential transactional processes between generations (e.g., children's self-regulation and parent-child interaction dynamics that may affect parents' self-regulation) that further influence intergenerational processes. In pointing the way forward, we note key future directions and ways to address limitations in existing work throughout the review and in closing. We also conclude by noting several implications for intervention work.
Collapse
Affiliation(s)
| | - Nicole M Burt
- Department of Psychology, Northern Illinois University
| | | | | |
Collapse
|
60
|
Sachs BD, Rodriguiz RM, Tran HL, Iyer A, Wetsel WC, Caron MG. Serotonin deficiency alters susceptibility to the long-term consequences of adverse early life experience. Psychoneuroendocrinology 2015; 53:69-81. [PMID: 25602134 PMCID: PMC4344834 DOI: 10.1016/j.psyneuen.2014.12.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Revised: 11/26/2014] [Accepted: 12/29/2014] [Indexed: 12/22/2022]
Abstract
Brain 5-HT deficiency has long been implicated in psychiatric disease, but the effects of 5-HT deficiency on stress susceptibility remain largely unknown. Early life stress (ELS) has been suggested to contribute to adult psychopathology, but efforts to study the long-term consequences of ELS have been limited by a lack of appropriate preclinical models. Here, we evaluated the effects of 5-HT deficiency on several long-term cellular, molecular, and behavioral responses of mice to a new model of ELS that combines early-life maternal separation (MS) of pups and postpartum learned helplessness (LH) training in dams. Our data demonstrate that this paradigm (LH/MS) induces depressive-like behavior and impairs pup retrieval in dams. In addition, we show that brain 5-HT deficiency exacerbates anxiety-like behavior induced by LH/MS and blunts the effects of LH/MS on acoustic startle responses in adult offspring. Although the mechanisms underlying these effects remain unclear, following LH/MS, 5-HT-deficient animals had significantly less mRNA expression of the mineralocorticoid receptor in the amygdala than wild-type animals. In addition, 5-HT-deficient mice exhibited reduced mRNA levels of the 5-HT2a receptor and p11 in the hippocampus regardless of stress. LH/MS decreased the number of doublecortin+ immature neurons in the hippocampus in both wild-type (WT) and 5-HT-deficient animals. Our data emphasize the importance of complex interactions between genetic factors and early life experience in mediating long-term changes in emotional behavior. These findings may have important implications for our understanding of the combinatorial roles of 5-HT deficiency, ELS, and postpartum depression in the development of neuropsychiatric disorders.
Collapse
MESH Headings
- Amygdala/metabolism
- Animals
- Animals, Newborn
- Behavior, Animal
- Depression, Postpartum/metabolism
- Depression, Postpartum/psychology
- Disease Models, Animal
- Disease Susceptibility
- Female
- Gene Knock-In Techniques
- Helplessness, Learned
- Hippocampus/metabolism
- Maternal Deprivation
- Mice
- Mutation
- Neurogenesis/genetics
- RNA, Messenger/metabolism
- Receptor, Serotonin, 5-HT2A/genetics
- Receptor, Serotonin, 5-HT2A/metabolism
- Receptors, Mineralocorticoid/genetics
- Receptors, Mineralocorticoid/metabolism
- Reflex, Abnormal
- Reflex, Startle
- Serotonin/deficiency
- Stress, Psychological/metabolism
- Stress, Psychological/psychology
- Tryptophan Hydroxylase/genetics
Collapse
Affiliation(s)
- Benjamin D Sachs
- Department of Cell Biology, Duke University Medical Center, Durham, NC 27710, United States
| | - Ramona M Rodriguiz
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC 27710, United States; Mouse Behavioral and Neuroendocrine Analysis Core Facility, Duke University Medical Center, Durham, NC 27710, United States
| | - Ha L Tran
- Department of Cell Biology, Duke University Medical Center, Durham, NC 27710, United States
| | - Akshita Iyer
- Department of Cell Biology, Duke University Medical Center, Durham, NC 27710, United States
| | - William C Wetsel
- Department of Cell Biology, Duke University Medical Center, Durham, NC 27710, United States; Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC 27710, United States; Mouse Behavioral and Neuroendocrine Analysis Core Facility, Duke University Medical Center, Durham, NC 27710, United States; Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, United States
| | - Marc G Caron
- Department of Cell Biology, Duke University Medical Center, Durham, NC 27710, United States; Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, United States.
| |
Collapse
|
61
|
Loria AS, Ho DH, Pollock JS. A mechanistic look at the effects of adversity early in life on cardiovascular disease risk during adulthood. Acta Physiol (Oxf) 2014; 210:277-87. [PMID: 24330084 DOI: 10.1111/apha.12189] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Revised: 10/22/2013] [Accepted: 10/23/2013] [Indexed: 12/23/2022]
Abstract
Early origins of adult disease may be defined as adversity or challenges during early life that alter physiological responses and prime the organism to chronic disease in adult life. Adverse childhood experiences or early life stress (ELS) may be considered a silent independent risk factor capable of predicting future cardiovascular disease risk. Maternal separation (MatSep) provides a suitable model to elucidate the underlying molecular mechanisms by which ELS increases the risk to develop cardiovascular disease in adulthood. The aim of this review is to describe the links between behavioural stress early in life and chronic cardiovascular disease risk in adulthood. We will discuss the following: (i) adult cardiovascular outcomes in humans subjected to ELS, (ii) MatSep as an animal model of ELS as well as the limitations and advantages of this model in rodents and (iii) possible ELS-induced mechanisms that predispose individuals to greater cardiovascular risk. Overall, exposure to a behavioural stressor early in life sensitizes the response to a second stressor later in life, thus unmasking an exaggerated cardiovascular dysfunction that may influence quality of life and life expectancy in adulthood.
Collapse
Affiliation(s)
- A. S. Loria
- Section of Experimental Medicine; Department of Medicine; Georgia Regents University; Augusta GA USA
| | - D. H. Ho
- Section of Experimental Medicine; Department of Medicine; Georgia Regents University; Augusta GA USA
| | - J. S. Pollock
- Section of Experimental Medicine; Department of Medicine; Georgia Regents University; Augusta GA USA
| |
Collapse
|
62
|
Lucion AB, Bortolini MC. Mother-pup interactions: rodents and humans. Front Endocrinol (Lausanne) 2014; 5:17. [PMID: 24616713 PMCID: PMC3935307 DOI: 10.3389/fendo.2014.00017] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2013] [Accepted: 02/08/2014] [Indexed: 12/14/2022] Open
Abstract
In order to survive after birth, mammalian infants need a caretaker, usually the mother. Several behavioral strategies have evolved to guarantee the transition from a period of intense caregiving to offspring independence. Here, we examine a selection of literature on the genetic, epigenetic, physiological, and behavioral factors relating to development and mother-infant interactions. We intend to show the utility of comparisons between rodent and human models for deepening knowledge regarding this key relationship. Particular attention is paid to the following factors: the distinct developmental stages of the mother-pup relationship as relating to behavior; examples of key genetic components of mammalian mother-infant interactions, specifically those coding for the hormones oxytocin and vasopressin; and the possible functions of gene imprinting in mediating interactions between genetics and environment in the mother-infant relationship. As early mother-infant attachment seems to establish the basic parameters for later social interactions, ongoing investigations in this area are essential. We propose the importance of interdisciplinary collaboration in order to better understand the network of genes, gene regulation, neuropeptide action, physiological processes, and feedback loops essential to understand the complex behaviors of mother-infant interaction.
Collapse
Affiliation(s)
- Aldo B. Lucion
- Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- *Correspondence: Aldo B. Lucion, Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite 500, Porto Alegre, Rio Grande do Sul 90050-170, Brazil e-mail:
| | - Maria Cátira Bortolini
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| |
Collapse
|
63
|
Feng M, Sheng G, Li Z, Wang J, Ren K, Jin X, Jiang K. Postnatal maternal separation enhances tonic GABA current of cortical layer 5 pyramidal neurons in juvenile rats and promotes genesis of GABAergic neurons in neocortical molecular layer and subventricular zone in adult rats. Behav Brain Res 2013; 260:74-82. [PMID: 24304720 DOI: 10.1016/j.bbr.2013.11.040] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Accepted: 11/24/2013] [Indexed: 02/07/2023]
Abstract
Postnatal maternal separation (PMS) has been shown to be associated with an increased vulnerability to psychiatric illnesses in adulthood. However, the underlying neurological mechanisms are not well understood. Here we evaluated its effects on neurogenesis and tonic GABA currents of cortical layer 5 (L5) pyramidal neurons. PMS not only increased cell proliferation in the subventricular zone, cortical layer 1 and hippocampal dentate gyrus in the adult brain, but also promoted the newly generated cells to differentiate into GABAergic neurons, and PMS adult brain maintained higher ratios of GABAergic neurons in the survival of newly generated cells within 5 days immediately post PMS. Additionally, PMS increased the tonic currents at P7-10 and P30-35 in cortical L5 pyramidal cells. Our results suggest that the newly generated GABAergic neurons and the low GABA concentration-activated tonic currents may be involved in the development of psychiatric disorders after PMS.
Collapse
Affiliation(s)
- Mei Feng
- Department of Neurology, The Children's Hospital Zhejiang University School of Medicine, 57 Zhugan Lane, Yanan Road, Hangzhou 310003, China
| | - Guoxia Sheng
- Department of Neurology, The Children's Hospital Zhejiang University School of Medicine, 57 Zhugan Lane, Yanan Road, Hangzhou 310003, China
| | - Zhongxia Li
- Department of Neurology, The Children's Hospital Zhejiang University School of Medicine, 57 Zhugan Lane, Yanan Road, Hangzhou 310003, China
| | - Jiangping Wang
- Department of rehabilitation, The Children's Hospital Zhejiang University School of Medicine, 57 Zhugan Lane, Yanan Road, Hangzhou 310003, China
| | - Keming Ren
- Department of Neurology, The Children's Hospital Zhejiang University School of Medicine, 57 Zhugan Lane, Yanan Road, Hangzhou 310003, China
| | - Xiaoming Jin
- Stark Neurosciences Research Institute Indiana University School of Medicine, 980 W, Walnut Street, R3, Room C432A, Indianapolis, IN 46202, USA
| | - Kewen Jiang
- Department of Neurology, The Children's Hospital Zhejiang University School of Medicine, 57 Zhugan Lane, Yanan Road, Hangzhou 310003, China; Department of Laboratory, The Children's Hospital Zhejiang University School of Medicine, 57 Zhugan Lane, Yanan Road, Hangzhou 310003, China.
| |
Collapse
|
64
|
Abstract
The momentum of genomic science will carry it far into the future and into the heart of research on typical and atypical behavioral development. The purpose of this paper is to focus on a few implications and applications of these advances for understanding behavioral development. Quantitative genetics is genomic and will chart the course for molecular genomic research now that these two worlds of genetics are merging in the search for many genes of small effect. Although current attempts to identify specific genes have had limited success, known as the missing heritability problem, whole-genome sequencing will improve this situation by identifying all DNA sequence variations, including rare variants. Because the heritability of complex traits is caused by many DNA variants of small effect in the population, polygenic scores that are composites of hundreds or thousands of DNA variants will be used by developmentalists to predict children's genetic risk and resilience. The most far-reaching advance will be the widespread availability of whole-genome sequence for children, which means that developmentalists would no longer need to obtain DNA or to genotype children in order to use genomic information in research or in the clinic.
Collapse
Affiliation(s)
- Robert Plomin
- King’s College London, MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, De Crespigny Park, London, SE5 8AF, United Kingdom
| | - Michael A. Simpson
- King’s College London, Department of Medical and Molecular Genetics, London, SE1 9RT, United Kingdom
| |
Collapse
|