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Durkin J, Poe AR, Belfer SJ, Rodriguez A, Tang SH, Walker JA, Kayser MS. Neurofibromin 1 regulates early developmental sleep in Drosophila. Neurobiol Sleep Circadian Rhythms 2023; 15:100101. [PMID: 37593040 PMCID: PMC10428071 DOI: 10.1016/j.nbscr.2023.100101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 06/30/2023] [Accepted: 08/06/2023] [Indexed: 08/19/2023] Open
Abstract
Sleep disturbances are common in neurodevelopmental disorders, but knowledge of molecular factors that govern sleep in young animals is lacking. Evidence across species, including Drosophila, suggests that juvenile sleep has distinct functions and regulatory mechanisms in comparison to sleep in maturity. In flies, manipulation of most known adult sleep regulatory genes is not associated with sleep phenotypes during early developmental (larval) stages. Here, we examine the role of the neurodevelopmental disorder-associated gene Neurofibromin 1 (Nf1) in sleep during numerous developmental periods. Mutations in Neurofibromin 1 (Nf1) are associated with sleep and circadian disorders in humans and adult flies. We find in flies that Nf1 acts to regulate sleep across the lifespan, beginning during larval stages. Nf1 is required in neurons for this function, as is signaling via the Alk pathway. These findings identify Nf1 as one of a small number of genes positioned to regulate sleep across developmental periods.
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Affiliation(s)
- Jaclyn Durkin
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Amy R. Poe
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Samuel J. Belfer
- Department of Neuroscience, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Anyara Rodriguez
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Si Hao Tang
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - James A. Walker
- Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA, 02114, USA
| | - Matthew S. Kayser
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
- Department of Neuroscience, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
- Chronobiology and Sleep Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
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2
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Milman NE, Tinsley CE, Raju RM, Lim MM. Loss of sleep when it is needed most - Consequences of persistent developmental sleep disruption: A scoping review of rodent models. Neurobiol Sleep Circadian Rhythms 2023; 14:100085. [PMID: 36567958 PMCID: PMC9768382 DOI: 10.1016/j.nbscr.2022.100085] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 11/22/2022] [Accepted: 11/23/2022] [Indexed: 12/12/2022] Open
Abstract
Sleep is an essential component of development. Developmental sleep disruption (DSD) impacts brain maturation and has been associated with significant consequences on socio-emotional development. In humans, poor sleep during infancy and adolescence affects neurodevelopmental outcomes and may be a risk factor for the development of autism spectrum disorder (ASD) or other neuropsychiatric illness. Given the wide-reaching and enduring consequences of DSD, identifying underlying mechanisms is critical to best inform interventions with translational capacity. In rodents, studies have identified some mechanisms and neural circuits by which DSD causes later social, emotional, sensorimotor, and cognitive changes. However, these studies spanned methodological differences, including different developmental timepoints for both sleep disruption and testing, different DSD paradigms, and even different rodent species. In this scoping review on DSD in rodents, we synthesize these various studies into a cohesive framework to identify common neural mechanisms underlying DSD-induced dysfunction in brain and behavior. Ultimately, this review serves the goal to inform the generation of novel translational interventions for human developmental disorders featuring sleep disruption.
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Affiliation(s)
- Noah E.P. Milman
- Oregon Health and Science University, Dept. of Behavioral and Systems Neuroscience, Portland, OR, 97214, USA
- Veterans Affairs Portland Health Care System, Portland, OR, 97214, USA
| | - Carolyn E. Tinsley
- Oregon Health and Science University, Dept. of Behavioral and Systems Neuroscience, Portland, OR, 97214, USA
- Veterans Affairs Portland Health Care System, Portland, OR, 97214, USA
| | - Ravikiran M. Raju
- Picower Institute for Learning and Memory, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Division of Newborn Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, 02115, USA
| | - Miranda M. Lim
- Oregon Health and Science University, Dept. of Behavioral and Systems Neuroscience, Portland, OR, 97214, USA
- Veterans Affairs Portland Health Care System, Portland, OR, 97214, USA
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3
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Genetic Mouse Models to Study Pancreatic Cancer-Induced Pain and Reduction in Well-Being. Cells 2022; 11:cells11172634. [PMID: 36078040 PMCID: PMC9454877 DOI: 10.3390/cells11172634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 08/11/2022] [Accepted: 08/22/2022] [Indexed: 11/17/2022] Open
Abstract
In addition to the poor prognosis, excruciating abdominal pain is a major challenge in pancreatic cancer. Neurotropism appears to be the underlying mechanism leading to neuronal invasion. However, there is a lack of animal models suitable for translationally bridging in vitro findings with clinical trials. We characterized KPC (KrasG12D/+; Trp53R172H/+; P48-Cre) and KPPC (KrasG12D/+; Trp53R172H/R172H; P48-Cre) mice with genetically determined pancreatic ductal adenocarcinoma (PDAC) and compared them with an orthotopic pancreatic cancer mouse model, healthy littermates and human tissue. We analyzed behavioral correlates of cancer-associated pain and well-being, and studied neuronal remodeling and cytokine expression. Histologically, we found similarities between KPC and KPPC tissue with human samples. Compared to healthy littermates, we detect nerve fiber hypertrophy, which was not restricted to a certain fiber type. Interestingly, while KPPC mice showed significantly reduced well-being, KPC mice emerged to be better suited for studying long-lasting cancer pain that emerges over a slow course of tumor progression. To address the neuroinflammatory correlate of loss of well-being, we studied cytokine levels in KPPC mice and observed a significant upregulation of CXCL16, TNFRSF5, CCL24, CXCL1, CCL22, CLL20 and CX2CL1. In summary, we demonstrate that the KPC mouse model is best suited to studying cancer pain, whereas the KPPC model can be employed to study cancer-associated reduction in well-being.
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Melatonin Reduces Alcohol Drinking in Rats with Disrupted Function of the Serotonergic System. J Pers Med 2022; 12:jpm12030355. [PMID: 35330355 PMCID: PMC8954110 DOI: 10.3390/jpm12030355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 02/15/2022] [Accepted: 02/22/2022] [Indexed: 02/01/2023] Open
Abstract
The reason for the limited treatment success of substance-use-related problems may be a causal heterogeneity of this disorder that, at least partly, is manifested as differences in substance-use motives between individuals. The aim of the present study was to assess if rats with pharmacologically induced differences in the function of the serotonergic system would respond differently to melatonin treatment compared to control rats with respect to voluntary alcohol consumption. To achieve this goal, we treated rats neonatally with the selective serotonin transporter (SERT) inhibitor escitalopram. This procedure has been reported to cause long-lasting sleep abnormalities in rodents. The study demonstrated that during adulthood, rats that had been treated with escitalopram tended to drink higher amounts of alcohol compared to control rats. Further, administration of melatonin significantly decreased the alcohol intake in escitalopram-treated animals but caused only a slight, nonsignificant reduction in the alcohol consumption by control rats. In conclusion, our data support the therapeutic potential of melatonin as a treatment for alcohol use disorder. However, interindividual differences between alcohol users may considerably modify the outcome of the melatonin treatment, whereby patients that manifest lower sleep quality due to disruption of serotonergic activity are more likely to benefit from this treatment.
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Bik A, Sam C, de Groot E, Visser S, Wang X, Tataranno M, Benders M, van den Hoogen A, Dudink J. A scoping review of behavioral sleep stage classification methods for preterm infants. Sleep Med 2022; 90:74-82. [DOI: 10.1016/j.sleep.2022.01.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 01/01/2022] [Accepted: 01/05/2022] [Indexed: 10/19/2022]
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Postnatal Fluoxetine Treatment Alters Perineuronal Net Formation and Maintenance in the Hippocampus. eNeuro 2021; 8:ENEURO.0424-20.2021. [PMID: 33622703 PMCID: PMC8046023 DOI: 10.1523/eneuro.0424-20.2021] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 01/27/2021] [Accepted: 01/28/2021] [Indexed: 01/20/2023] Open
Abstract
Elevation of serotonin via postnatal fluoxetine (PNFlx) treatment during critical temporal windows is hypothesized to perturb the development of limbic circuits thus establishing a substratum for persistent disruption of mood-related behavior. We examined the impact of PNFlx treatment on the formation and maintenance of perineuronal nets (PNNs), extracellular matrix (ECM) structures that deposit primarily around inhibitory interneurons, and mark the closure of critical period plasticity. PNFlx treatment evoked a significant decline in PNN number, with a robust reduction in PNNs deposited around parvalbumin (PV) interneurons, within the CA1 and CA3 hippocampal subfields at postnatal day (P)21 in Sprague Dawley rat pups. While the reduction in CA1 subfield PNN number was still observed in adulthood, we observed no change in colocalization of PV-positive interneurons with PNNs in the hippocampi of adult PNFlx animals. PNFlx treatment did not alter hippocampal PV, calretinin (CalR), or Reelin-positive neuron numbers in PNFlx animals at P21 or in adulthood. We did observe a small, but significant increase in somatostatin (SST)-positive interneurons in the DG subfield of PNFlx-treated animals in adulthood. This was accompanied by altered GABA-A receptor subunit composition, increased dendritic complexity of apical dendrites of CA1 pyramidal neurons, and enhanced neuronal activation revealed by increased c-Fos-positive cell numbers within hippocampi of PNFlx-treated animals in adulthood. These results indicate that PNFlx treatment alters the formation of PNNs within the hippocampus, raising the possibility of a disruption of excitation-inhibition (E/I) balance within this key limbic brain region.
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The value of cardiorespiratory parameters for sleep state classification in preterm infants: A systematic review. Sleep Med Rev 2021; 58:101462. [PMID: 33826975 DOI: 10.1016/j.smrv.2021.101462] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 02/24/2021] [Accepted: 03/03/2021] [Indexed: 11/23/2022]
Abstract
Cardiorespiratory activity is highly associated with infants' sleep duration and quality. We performed a systematic literature search of PubMed and EMBASE databases to investigate if and how cardiorespiratory parameters can be used for sleep state classification in preterm infants and in what way maturation influences this relation. All retrieved citations were screened against predetermined inclusion and exclusion criteria. Only studies of preterm infants (<37 wk postmenstrual age during sleep state classification) admitted to a neonatal ward and of whom at least one sleep state and one cardiorespiratory parameter was measured, were included. Two researchers independently reviewed the included studies on methodological quality. Of the 1097 initially retrieved studies, 23 were included for analysis. Heart rate and respiration frequency are strongly correlated with active sleep and quiet sleep. In quiet sleep, as compared to active sleep, respiratory frequency is more stable, and the heart rate is lower and less variable. This association, however, differed across preterm birth subtypes (i.e., extremely, very or late preterm), indicating that maturation - in the form of both gestational and postnatal age - influences the cardiorespiratory characteristics of preterm sleep states. The knowledge gained from this review can help improve behavioral sleep classification and automated sleep classification algorithms for preterm infants.
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Frank MG. The Ontogenesis of Mammalian Sleep: Form and Function. CURRENT SLEEP MEDICINE REPORTS 2020; 6:267-279. [PMID: 33816063 PMCID: PMC8014960 DOI: 10.1007/s40675-020-00190-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/27/2020] [Indexed: 10/23/2022]
Abstract
PURPOSE OF REVIEW To present an up-to-date review and synthesis of findings about perinatal sleep development and function. I discuss landmark events in sleep ontogenesis, evidence that sleep promotes brain development and plasticity, and experimental considerations in this topic. RECENT FINDINGS Mammalian sleep undergoes dramatic changes in expression and regulation during perinatal development. This includes a progressive decrease in rapid-eye-movement (REM) sleep time, corresponding increases in nonREM sleep and wake time, and the appearance of mature sleep regulatory processes (homeostatic and circadian). These developmental events coincide with periods of rapid brain maturation and heightened synaptic plasticity. The latter involve an initial experience-independent phase, when circuit development is guided by spontaneous activity, and later occurring critical periods, when these circuits are shaped by experience. SUMMARY These ontogenetic changes suggest important interactions between sleep and brain development. More specifically, sleep may promote developmental programs of synaptogenesis and synaptic pruning and influence the opening and closing of critical periods of brain plasticity.
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Affiliation(s)
- Marcos G Frank
- Washington State University Spokane, Elson S. Floyd College of Medicine, Pharmaceutical and Biomedical Science Building 213, 412 E. Spokane Falls Blvd
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Jamieson D, Broadhouse KM, Lagopoulos J, Hermens DF. Investigating the links between adolescent sleep deprivation, fronto-limbic connectivity and the Onset of Mental Disorders: a review of the literature. Sleep Med 2020; 66:61-67. [DOI: 10.1016/j.sleep.2019.08.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 08/19/2019] [Accepted: 08/19/2019] [Indexed: 01/06/2023]
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Jones CE, Opel RA, Kaiser ME, Chau AQ, Quintana JR, Nipper MA, Finn DA, Hammock EAD, Lim MM. Early-life sleep disruption increases parvalbumin in primary somatosensory cortex and impairs social bonding in prairie voles. SCIENCE ADVANCES 2019; 5:eaav5188. [PMID: 30729165 PMCID: PMC6353622 DOI: 10.1126/sciadv.aav5188] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 12/13/2018] [Indexed: 05/09/2023]
Abstract
Across mammals, juveniles sleep more than adults, with rapid eye movement (REM) sleep at a lifetime maximum early in life. One function of REM sleep may be to facilitate brain development of complex behaviors. Here, we applied 1 week of early-life sleep disruption (ELSD) in prairie voles (Microtus ochrogaster), a highly social rodent species that forms lifelong pair bonds. Electroencephalographic recordings from juvenile voles during ELSD revealed decreased REM sleep and reduced γ power compared to baseline. ELSD impaired pair bond formation and altered object preference in adulthood. Furthermore, ELSD increased GABAergic parvalbumin immunoreactivity in the primary somatosensory cortex in adulthood, a brain region relevant to both affected behaviors. We propose that, early in life, sleep is crucial for tuning inhibitory neural circuits and the development of species-typical affiliative social behavior.
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Affiliation(s)
- Carolyn E. Jones
- VA Portland Healthcare System, Portland, OR, USA
- Department of Neurology, Oregon Health & Science University, Portland, OR, USA
| | - Ryan A. Opel
- VA Portland Healthcare System, Portland, OR, USA
| | | | - Alex Q. Chau
- VA Portland Healthcare System, Portland, OR, USA
| | - Jazmine R. Quintana
- Department of Psychology and Program in Neuroscience, Florida State University, Tallahassee, FL, USA
| | - Michelle A. Nipper
- VA Portland Healthcare System, Portland, OR, USA
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, USA
| | - Deborah A. Finn
- VA Portland Healthcare System, Portland, OR, USA
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, USA
| | - Elizabeth A. D. Hammock
- Department of Psychology and Program in Neuroscience, Florida State University, Tallahassee, FL, USA
| | - Miranda M. Lim
- VA Portland Healthcare System, Portland, OR, USA
- Department of Neurology, Oregon Health & Science University, Portland, OR, USA
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, USA
- Department of Medicine and Oregon Institute of Occupational Health Sciences, Oregon Health & Science University, Portland, OR, USA
- Corresponding author.
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11
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Post-SSRI Sexual Dysfunction: Preclinical to Clinical. Is It Fact or Fiction? Sex Med Rev 2018; 6:217-223. [DOI: 10.1016/j.sxmr.2017.11.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2017] [Revised: 11/12/2017] [Accepted: 11/29/2017] [Indexed: 12/14/2022]
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12
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Gemmel M, Bögi E, Ragan C, Hazlett M, Dubovicky M, van den Hove DL, Oberlander TF, Charlier TD, Pawluski JL. Perinatal selective serotonin reuptake inhibitor medication (SSRI) effects on social behaviors, neurodevelopment and the epigenome. Neurosci Biobehav Rev 2018; 85:102-116. [DOI: 10.1016/j.neubiorev.2017.04.023] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 04/10/2017] [Accepted: 04/21/2017] [Indexed: 12/15/2022]
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13
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Okawa H, Morokuma S, Maehara K, Arata A, Ohmura Y, Horinouchi T, Konishi Y, Kato K. Eye movement activity in normal human fetuses between 24 and 39 weeks of gestation. PLoS One 2017; 12:e0178722. [PMID: 28700709 PMCID: PMC5507482 DOI: 10.1371/journal.pone.0178722] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 05/17/2017] [Indexed: 11/19/2022] Open
Abstract
Rapid eye movement (REM) sleep occurs throughout a relatively large proportion of early development, and normal REM activity appears to be required for healthy brain development. The eye movements (EMs) observed during REM sleep are the most distinctive characteristics of this state. EMs are used as an index of neurological function postnatally, but no specific indices of EM activity exist for fetuses. We aimed to identify and characterize EM activity, particularly EM bursts suggestive of REM periods, in fetuses with a gestational age between 24 and 39 weeks. This cross-sectional study included 84 normal singleton pregnancies. Fetal EMs were monitored using real-time ultrasonography for 60 min and recorded as videos. The videos were manually converted into a time series of EM events, which were then analyzed by piecewise linear regression for various EM characteristics, including EM density, EM burst density, density of EMs in EM bursts, and continuous EM burst time. Two critical points for EM density, EM burst density, and density of EMs in EM bursts were evident at gestation weeks 28–29 and 36–37. Overall EM activity in human fetuses increased until 28–29 weeks of gestation, then again from 36–37 to 38–39 weeks of gestation. These findings may be useful for creating indices of fetal neurological function for prognostic purposes.
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Affiliation(s)
- Hikohiro Okawa
- Department of Obstetrics and Gynecology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Seiichi Morokuma
- Research Center for Environmental and Developmental Medical Sciences, Kyushu University, Fukuoka, Japan
- Department of Obstetrics and Gynecology, Kyushu University hospital, Fukuoka, Japan
- * E-mail:
| | - Kana Maehara
- Department of Obstetrics and Gynecology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Akiko Arata
- Division of Physiome, Department of Physiology, Hyogo College of Medicine, Hyogo, Japan
| | - Yoshiyuki Ohmura
- Department of Mechano-Informatics, Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan
| | - Takashi Horinouchi
- Department of Obstetrics and Gynecology, Kurume University School of Medicine, Kurume, Japan
| | - Yukuo Konishi
- Center for Baby Science, Doshisha University, Kyoto, Japan
| | - Kiyoko Kato
- Department of Obstetrics and Gynecology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Rotenberg VS. Search Activity Concept: Relationship between Behavior, Health and Brain Functions. ACTA ACUST UNITED AC 2017. [DOI: 10.1007/bf03379921] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Abstract
Search activity concept provides a new classification of the behavior which distinguishes search activity (activity in the uncertain situation with the constant feedback between behavior and its outcome), stereotyped behavior with a definite probability forecast, panic (activity without feedback between activity and its outcome) and renunciation of search. Only search activity which includes fight, flight, orienting behavior and creativity raises the body’s resistance to stress, to natural and experimentally induced pathology whereas renunciation of search which display itself in freezing, helplessness and depression forms a nonspecific predisposition to somatic disturbances (e.g. psychosomatic diseases). Dreams in REM sleep are regarded as a specific form of search activity aimed at compensating for the lack of search in waking. REM sleep deprivation on a small as well as on rotating platform raises the requirement in REM sleep by frustrating search activity. It is suggested that in wakefulness characterized by the prominent search activity the inhibitory alpha-2- adrenoreceptors became less sensitive to stimulation and consequently in this state the activity of the brain monoamine neurons is less limited by the level of brain monoamines. During renunciation of search brain monoamine synthesis is not stimulated by monoamine exhaustion. In REM sleep the critical level of brain monoamines for search activity to start is lower than in wakefulness and alpha-2-adrenoreceptors are less sensitive than in the state of renunciation of search although more sensitive than during search behavior in waking. REM sleep indirectly contributes to memory consolidation by carrying out its main function — restoration of search activity. A functionally sufficient REM sleep contains search activity in dreams (subject is active in his/her own dream scenario) while in functionally insufficient REM sleep dreams are characterized by subject’s passive position and feeling of helplessness. REM sleep insufficiency is an obligate condition for mental and somatic disorders to appear. The difference between normal (adaptive) and pathological (maladaptive) emotional tension is determined by the presence or absence of search activity in the structure of emotional tension. Repression of the unacceptable motive causing neurotic anxiety is a human variant of renunciation of search. Hypochondriac symptoms are in negative relationships with psychosomatic disorders and they, as well as positive symptoms in schizophrenia and anorectic behavior in anorexia nervosa, represent a pathological misdirected search activity.
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15
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Sleep and Development in Genetically Tractable Model Organisms. Genetics 2017; 203:21-33. [PMID: 27183564 DOI: 10.1534/genetics.116.189589] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 03/21/2016] [Indexed: 12/21/2022] Open
Abstract
Sleep is widely recognized as essential, but without a clear singular function. Inadequate sleep impairs cognition, metabolism, immune function, and many other processes. Work in genetic model systems has greatly expanded our understanding of basic sleep neurobiology as well as introduced new concepts for why we sleep. Among these is an idea with its roots in human work nearly 50 years old: sleep in early life is crucial for normal brain maturation. Nearly all known species that sleep do so more while immature, and this increased sleep coincides with a period of exuberant synaptogenesis and massive neural circuit remodeling. Adequate sleep also appears critical for normal neurodevelopmental progression. This article describes recent findings regarding molecular and circuit mechanisms of sleep, with a focus on development and the insights garnered from models amenable to detailed genetic analyses.
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Gellén B, Völgyi K, Györffy BA, Darula Z, Hunyadi-Gulyás É, Baracskay P, Czurkó A, Hernádi I, Juhász G, Dobolyi Á, Kékesi KA. Proteomic investigation of the prefrontal cortex in the rat clomipramine model of depression. J Proteomics 2017; 153:53-64. [DOI: 10.1016/j.jprot.2016.06.027] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Revised: 06/17/2016] [Accepted: 06/22/2016] [Indexed: 12/16/2022]
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17
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Glover ME, Clinton SM. Of rodents and humans: A comparative review of the neurobehavioral effects of early life SSRI exposure in preclinical and clinical research. Int J Dev Neurosci 2016; 51:50-72. [PMID: 27165448 PMCID: PMC4930157 DOI: 10.1016/j.ijdevneu.2016.04.008] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 04/20/2016] [Accepted: 04/20/2016] [Indexed: 02/08/2023] Open
Abstract
Selective serotonin reuptake inhibitors (SSRIs) have been a mainstay pharmacological treatment for women experiencing depression during pregnancy and postpartum for the past 25 years. SSRIs act via blockade of the presynaptic serotonin transporter and result in a transient increase in synaptic serotonin. Long-lasting changes in cellular function such as serotonergic transmission, neurogenesis, and epigenetics, are thought to underlie the therapeutic benefits of SSRIs. In recent years, though, growing evidence in clinical and preclinical settings indicate that offspring exposed to SSRIs in utero or as neonates exhibit long-lasting behavioral adaptions. Clinically, children exposed to SSRIs in early life exhibit increased internalizing behavior reduced social behavior, and increased risk for depression in adolescence. Similarly, rodents exposed to SSRIs perinatally exhibit increased traits of anxiety- or depression-like behavior. Furthermore, certain individuals appear to be more susceptible to early life SSRI exposure than others, suggesting that perinatal SSRI exposure may pose greater risks for negative outcome within certain populations. Although SSRIs trigger a number of intracellular processes that likely contribute to their therapeutic effects, early life antidepressant exposure during critical neurodevelopmental periods may elicit lasting negative effects in offspring. In this review, we cover the basic development and structure of the serotonin system, how the system is affected by early life SSRI exposure, and the behavioral outcomes of perinatal SSRI exposure in both clinical and preclinical settings. We review recent evidence indicating that perinatal SSRI exposure perturbs the developing limbic system, including altered serotonergic transmission, neurogenesis, and epigenetic processes in the hippocampus, which may contribute to behavioral domains (e.g., sociability, cognition, anxiety, and behavioral despair) that are affected by perinatal SSRI treatment. Identifying the molecular mechanisms that underlie the deleterious behavioral effects of perinatal SSRI exposure may highlight biological mechanisms in the etiology of mood disorders. Moreover, because recent studies suggest that certain individuals may be more susceptible to the negative consequences of early life SSRI exposure than others, understanding mechanisms that drive such susceptibility could lead to individualized treatment strategies for depressed women who are or plan to become pregnant.
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Affiliation(s)
| | - Sarah M Clinton
- Department of Psychiatry, University of Alabama-Birmingham, USA.
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18
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Corner MA, Schenck CH. Perchance to dream? Primordial motor activity patterns in vertebrates from fish to mammals: their prenatal origin, postnatal persistence during sleep, and pathological reemergence during REM sleep behavior disorder. Neurosci Bull 2015; 31:649-62. [PMID: 26319263 PMCID: PMC5563724 DOI: 10.1007/s12264-015-1557-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2015] [Accepted: 06/25/2015] [Indexed: 12/14/2022] Open
Abstract
An overview is presented of the literature dealing with sleep-like motility and concomitant neuronal activity patterns throughout the life cycle in vertebrates, ectothermic as well as endothermic. Spontaneous, periodically modulated, neurogenic bursts of non-purposive movements are a universal feature of larval and prenatal behavior, which in endothermic animals (i.e. birds and mammals) continue to occur periodically throughout life. Since the entire body musculature is involved in ever-shifting combinations, it is proposed that these spontaneously active periods be designated as 'rapid-BODY-movement' (RBM) sleep. The term 'rapid-EYE-movement (REM) sleep', characterized by attenuated muscle contractions and reduced tonus, can then be reserved for sleep at later stages of development. Mature stages of development in which sustained muscle atonia is combined with 'paradoxical arousal' of cortical neuronal firing patterns indisputably represent the evolutionarily most recent aspect of REM sleep, but more research with ectothermic vertebrates, such as fish, amphibians and reptiles, is needed before it can be concluded (as many prematurely have) that RBM is absent in these species. Evidence suggests a link between RBM sleep in early development and the clinical condition known as 'REM sleep behavior disorder (RBD)', which is characterized by the resurgence of periodic bouts of quasi-fetal motility that closely resemble RBM sleep. Early developmental neuromotor risk factors for RBD in humans also point to a relationship between RBM sleep and RBD.
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Affiliation(s)
- Michael A Corner
- Netherlands Institute for Brain Research, Amsterdam, The Netherlands
| | - Carlos H Schenck
- Minnesota Regional Sleep Disorders Center, Hennepin County Medical Center and University of Minnesota, Minneapolis, Minnesota, 55415, USA.
- Departments of Psychiatry, Hennepin County Medical Center and University of Minnesota, Minneapolis, Minnesota, 55415, USA.
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Developmental emergence of an obsessive-compulsive phenotype and binge behavior in rats. Psychopharmacology (Berl) 2015; 232:3173-81. [PMID: 26018530 PMCID: PMC4536183 DOI: 10.1007/s00213-015-3967-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 05/11/2015] [Indexed: 12/22/2022]
Abstract
RATIONALE Obsessive-compulsive disorder (OCD) gradually emerges and reaches clinical significance during early adulthood. Whether a predisposition for OCD manifests as binge eating disorder earlier during adolescence is proposed. OBJECTIVES To further characterize how OCD-like behaviors increase across maturation and to determine whether an OCD-like predisposition increases the likelihood of binge eating during adolescence. METHODS Male and female Sprague-Dawley rats were injected with the tricyclic antidepressant clomipramine (CMI, 15 mg/kg) or saline vehicle twice daily between postnatal days 9-15. Both groups were tested for perseverative (spontaneous alternation) and anxiety-like (elevated plus maze; marble burying) behaviors during juvenility (day 28), adolescence (day 60), and adulthood (day 90). Both motivations to eat sucrose pellets and binge eating on fat were investigated. RESULTS Sex- and age-dependent increases in anxiety-like and perseverative behavior were observed in CMI subjects. Differences in consummatory behaviors emerged during late adolescence, while no significant differences in alternation or anxiety-like behaviors were detected between CMI and vehicle animals until adulthood. Adolescent CMI females consumed more sucrose pellets in 30 min relative to vehicle females, whereas adolescent CMI males consumed approximately half as much as vehicle males. Sucrose consumption did not differ between groups in adulthood. Adolescent CMI rats demonstrated more fat bingeing than vehicles, independent of sex. CONCLUSIONS OCD-like behaviors are emerging during adolescence, but sucrose consumption and fat bingeing in CMI-treated animals significantly precedes the appearance of anxiety and perseveration. This OCD-like phenotype emerges fully during adulthood, suggesting that eating may likely serve as a coping strategy in these animals.
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20
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Altieri SC, Yang H, O'Brien HJ, Redwine HM, Senturk D, Hensler JG, Andrews AM. Perinatal vs genetic programming of serotonin states associated with anxiety. Neuropsychopharmacology 2015; 40:1456-70. [PMID: 25523893 PMCID: PMC4397404 DOI: 10.1038/npp.2014.331] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 12/05/2014] [Accepted: 12/07/2014] [Indexed: 12/24/2022]
Abstract
Large numbers of women undergo antidepressant treatment during pregnancy; however, long-term consequences for their offspring remain largely unknown. Rodents exposed to serotonin transporter (SERT)-inhibiting antidepressants during development show changes in adult emotion-like behavior. These changes have been equated with behavioral alterations arising from genetic reductions in SERT. Both models are highly relevant to humans yet they vary in their time frames of SERT disruption. We find that anxiety-related behavior and, importantly, underlying serotonin neurotransmission diverge between the two models. In mice, constitutive loss of SERT causes life-long increases in anxiety-related behavior and hyperserotonemia. Conversely, early exposure to the antidepressant escitalopram (ESC; Lexapro) results in decreased anxiety-related behavior beginning in adolescence, which is associated with adult serotonin system hypofunction in the ventral hippocampus. Adult behavioral changes resulting from early fluoxetine (Prozac) exposure were different from those of ESC and, although somewhat similar to SERT deficiency, were not associated with changes in hippocampal serotonin transmission in late adulthood. These findings reveal dissimilarities in adult behavior and neurotransmission arising from developmental exposure to different widely prescribed antidepressants that are not recapitulated by genetic SERT insufficiency. Moreover, they support a pivotal role for serotonergic modulation of anxiety-related behavior.
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Affiliation(s)
- Stefanie C Altieri
- Semel Institute for Neuroscience and Human Behavior and Hatos Center for Neuropharmacology, David Geffen School of Medicine, and California NanoSystems Institute, University of California, Los Angeles, CA, USA
- Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, USA
| | - Hongyan Yang
- Semel Institute for Neuroscience and Human Behavior and Hatos Center for Neuropharmacology, David Geffen School of Medicine, and California NanoSystems Institute, University of California, Los Angeles, CA, USA
| | - Hannah J O'Brien
- Semel Institute for Neuroscience and Human Behavior and Hatos Center for Neuropharmacology, David Geffen School of Medicine, and California NanoSystems Institute, University of California, Los Angeles, CA, USA
| | - Hannah M Redwine
- Department of Pharmacology, University of Texas Health Science Center, San Antonio, TX, USA
| | - Damla Senturk
- Department of Biostatistics, Fielding School of Public Health, University of California, Los Angeles, CA, USA
| | - Julie G Hensler
- Department of Pharmacology, University of Texas Health Science Center, San Antonio, TX, USA
| | - Anne M Andrews
- Semel Institute for Neuroscience and Human Behavior and Hatos Center for Neuropharmacology, David Geffen School of Medicine, and California NanoSystems Institute, University of California, Los Angeles, CA, USA
- Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, USA
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21
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Glover ME, Pugh PC, Jackson NL, Cohen JL, Fant AD, Akil H, Clinton SM. Early-life exposure to the SSRI paroxetine exacerbates depression-like behavior in anxiety/depression-prone rats. Neuroscience 2014; 284:775-797. [PMID: 25451292 DOI: 10.1016/j.neuroscience.2014.10.044] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Revised: 10/27/2014] [Accepted: 10/28/2014] [Indexed: 12/26/2022]
Abstract
Selective serotonin reuptake inhibitor (SSRI) antidepressants are the mainstay treatment for the 10-20% of pregnant and postpartum women who suffer major depression, but the effects of SSRIs on their children's developing brain and later emotional health are poorly understood. SSRI use during pregnancy can elicit antidepressant withdrawal in newborns and increase toddlers' anxiety and social avoidance. In rodents, perinatal SSRI exposure increases adult depression- and anxiety-like behavior, although certain individuals are more vulnerable to these effects than others. Our study establishes a rodent model of individual differences in susceptibility to perinatal SSRI exposure, utilizing selectively bred Low Responder (bLR) and High Responder (bHR) rats that were previously bred for high versus low behavioral response to novelty. Pregnant bHR/bLR females were chronically treated with the SSRI paroxetine (10 mg/kg/day p.o.) to examine its effects on offspring's emotional behavior and gene expression in the developing brain. Paroxetine treatment had minimal effect on bHR/bLR dams' pregnancy outcomes or maternal behavior. We found that bLR offspring, naturally prone to an inhibited/anxious temperament, were susceptible to behavioral abnormalities associated with perinatal SSRI exposure (which exacerbated their Forced Swim Test immobility), while high risk-taking bHR offspring were resistant. Microarray studies revealed robust perinatal SSRI-induced gene expression changes in the developing bLR hippocampus and amygdala (postnatal days 7-21), including transcripts involved in neurogenesis, synaptic vesicle components, and energy metabolism. These results highlight the bLR/bHR model as a useful tool to explore the neurobiology of individual differences in susceptibility to perinatal SSRI exposure.
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Affiliation(s)
- M E Glover
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama-Birmingham, USA
| | - P C Pugh
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama-Birmingham, USA
| | - N L Jackson
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama-Birmingham, USA
| | - J L Cohen
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama-Birmingham, USA
| | - A D Fant
- Division of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, USA
| | - H Akil
- Molecular and Behavioral Neuroscience Institute, University of Michigan, USA
| | - S M Clinton
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama-Birmingham, USA.
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He Y, Hogrefe CE, Grapov D, Palazoglu M, Fiehn O, Turck CW, Golub MS. Identifying individual differences of fluoxetine response in juvenile rhesus monkeys by metabolite profiling. Transl Psychiatry 2014; 4:e478. [PMID: 25369145 PMCID: PMC4259988 DOI: 10.1038/tp.2014.116] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Revised: 09/02/2014] [Accepted: 09/19/2014] [Indexed: 12/23/2022] Open
Abstract
Fluoxetine is the only psychopharmacological agent approved for depression by the US Food and Drug Administration for children and is commonly used therapeutically in a variety of neurodevelopmental disorders. Therapeutic response shows high individual variability, and severe side effects have been observed. In the current study we set out to identify biomarkers of response to fluoxetine as well as biomarkers that correlate with impulsivity, a measure of reward delay behavior and potential side effect of the drug, in juvenile male rhesus monkeys. The study group was also genotyped for polymorphisms of monoamine oxidase A (MAOA), a gene that has been associated with psychiatric disorders. We used peripheral metabolite profiling of blood and cerebrospinal fluid (CSF) from animals treated daily with fluoxetine or vehicle for one year. Fluoxetine response metabolite profiles and metabolite/reward delay behavior associations were evaluated using multivariate analysis. Our analyses identified a set of plasma and CSF metabolites that distinguish fluoxetine- from vehicle-treated animals and metabolites that correlate with impulsivity. Some metabolites displayed an interaction between fluoxetine and MAOA genotype. The identified metabolite biomarkers belong to pathways that have important functions in central nervous system physiology. Biomarkers of response to fluoxetine in the normally functioning brain of juvenile nonhuman primates may aid in finding predictors of response to treatment in young psychiatric populations and in progress toward the realization of a precision medicine approach in the area of neurodevelopmental disorders.
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Affiliation(s)
- Y He
- Department of Translational Research in Psychiatry, Max Planck Institute of Psychiatry, Munich, Germany
| | - C E Hogrefe
- California National Primate Research Center, University of California, Davis, Davis, CA, USA
| | - D Grapov
- NIH West Coast Metabolomics Center, University of California, Davis, Davis, CA, USA
| | - M Palazoglu
- NIH West Coast Metabolomics Center, University of California, Davis, Davis, CA, USA
| | - O Fiehn
- NIH West Coast Metabolomics Center, University of California, Davis, Davis, CA, USA
| | - C W Turck
- Department of Translational Research in Psychiatry, Max Planck Institute of Psychiatry, Munich, Germany,Department of Translational Research in Psychiatry, Max Planck Institute of Psychiatry, Kraepelinstrasse 2, Munich, D-80804, Germany E-mail:
| | - M S Golub
- Department of Environmental Toxicology, University of California, Davis, Davis, CA, USA,Department of Environmental Toxicology, University of California Davis, Davis, CA 95616, USA. E-mail:
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Limón-Morales O, Soria-Fregozo C, Arteaga-Silva M, González MH, Vázquez-Palacios G, Bonilla-Jaime H. Hormone replacement with 17β-estradiol plus dihydrotestosterone restores male sexual behavior in rats treated neonatally with clomipramine. Horm Behav 2014; 66:820-7. [PMID: 25449595 DOI: 10.1016/j.yhbeh.2014.09.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 09/18/2014] [Accepted: 09/23/2014] [Indexed: 11/25/2022]
Abstract
Male sexual behavior (MSB) in rodents, in both its consummatory and motivational components, is regulated by hormones such as testosterone, 17β-estradiol and 5-α-dihydrotestosterone. In experiments, neonatal treatment with clomipramine (CMI; a serotonin reuptake inhibitor) reproduces some of the signs of depression in adult age, including reduced sexual behavior manifested in a lower percentage of subjects that mount, intromit and ejaculate, although their testosterone levels were not altered. However, the effect of this treatment on estrogen levels and the consequences of hormone substitution using 17β-estradiol and 5-α-dihydrotestosterone on the expression of male sexual behavior are still unknown. Therefore, the objective of the present study was to analyze the effect of neonatal treatment with CMI on plasma testosterone and 17β-estradiol levels, and the role of testosterone, 17β-estradiol and 5-α-dihydrotestosterone in altering the consummatory and motivational components of sexual behavior in male rats. To this end, it analyzed the copulatory parameters and sexual incentive motivation (SIM) of rats treated with CMI under two conditions: basal and post-hormone replacements. Neonatal treatment with CMI did not affect plasma testosterone or 17β-estradiol concentrations, but did decrease both the consummatory component and sexual motivation according to the results of the SIM test. These aspects were recovered after administering 17β-estradiol +5-α-dihydrotestosterone, but not testosterone.
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Affiliation(s)
- Ofelia Limón-Morales
- Posgrado en Biología Experimental, Universidad Autónoma Metropolitana-Iztapalapa. Apartado, Postal 55 535, C.P. 09340, D.F. México
| | - Cesar Soria-Fregozo
- Laboratorio de Psicobiologia, Centro Universitario de los Lagos, Universidad de Guadalajara, México
| | - Marcela Arteaga-Silva
- Departamento de Biología de la Reproducción, Universidad Autónoma Metropolitana-Iztapalapa. Apartado Postal 55 535, C.P. 09340, D.F. México
| | - Marisela Hernández González
- Instituto de Neurociencias, Universidad de Guadalajara, Francisco de Quevedo 180, Col. Arcos de Vallarta, CP 44130, Guadalajara, Jalisco, México
| | - Gonzalo Vázquez-Palacios
- Colegio De Ciencia y Tecnología, Universidad Autónoma de la Ciudad de México-San Lorenzo Tezonco, Av. Prolongación San Isidro 151, Col. San Lorenzo Tezonco, Deleg, Iztapalapa CP 09790, México
| | - Herlinda Bonilla-Jaime
- Departamento de Biología de la Reproducción, Universidad Autónoma Metropolitana-Iztapalapa. Apartado Postal 55 535, C.P. 09340, D.F. México.
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Bravo JA, Dinan TG, Cryan JF. Early-life stress induces persistent alterations in 5-HT1A receptor and serotonin transporter mRNA expression in the adult rat brain. Front Mol Neurosci 2014; 7:24. [PMID: 24782706 PMCID: PMC3989758 DOI: 10.3389/fnmol.2014.00024] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Accepted: 03/19/2014] [Indexed: 11/13/2022] Open
Abstract
Early-life experience plays a major role in the stress response throughout life. Neonatal maternal separation (MS) is an animal model of depression with an altered serotonergic response. We hypothesize that this alteration may be caused by differences in 5-HT1A receptor and serotonin transporter (SERT) mRNA expression in brain areas involved in the control of emotions, memory, and fear as well as in regions controlling the central serotonergic tone. To test this, Sprague-Dawley rats were subjected to MS for 3 h daily during postnatal days 2-12. As control, age matched rats were non-separated (NS) from their dams. When animals reached adulthood (11-13 weeks) brain was extracted and mRNA expression of 5-HT1A receptor in amygdala, hippocampus and dorsal raphé nucleus (DRN) and SERT in the DRN was analyzed through in situ hybridisation. Densitometric analysis revealed that MS increased 5-HT1A receptor mRNA expression in the amygdala, and reduced its expression in the DRN, but no changes were observed in the hippocampus in comparison to NS controls. Also, MS reduced SERT mRNA expression in the DRN when compared to NS rats. These results suggest that early-life stress induces persistent changes in 5-HT1A receptor and SERT mRNA expression in key brain regions involved in the development of stress-related psychiatric disorders. The reduction in SERT mRNA indicates an alteration that is in line with clinical findings such as polymorphic variants in individuals with higher risk of depression. These data may help to understand how early-life stress contributes to the development of mood disorders in adulthood.
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Affiliation(s)
- Javier A Bravo
- Grupo de NeuroGastroBioquímica, Laboratorio de Química Biológica, Instituto de Química, Facultad de Ciencias, Pontificia Universidad Católica de Valparaíso Valparaíso, Chile
| | - Timothy G Dinan
- Department of Psychiatry, University College Cork Cork, Ireland ; Laboratory of Neurogastroenterology, Alimentary Pharmabiotic Centre, University College Cork Cork, Ireland
| | - John F Cryan
- Laboratory of Neurogastroenterology, Alimentary Pharmabiotic Centre, University College Cork Cork, Ireland ; Department of Anatomy, University College Cork Cork, Ireland
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Lasting neurobehavioral abnormalities in rats after neonatal activation of serotonin 1A and 1B receptors: possible mechanisms for serotonin dysfunction in autistic spectrum disorders. Psychopharmacology (Berl) 2014; 231:1191-200. [PMID: 23975037 PMCID: PMC3933458 DOI: 10.1007/s00213-013-3242-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Accepted: 08/06/2013] [Indexed: 10/26/2022]
Abstract
RATIONALE Perinatal exposure of rats to selective serotonin reuptake inhibitors (SSRIs) produces sensory and social abnormalities paralleling those seen in autistic spectrum disorders (ASDs). However, the possible mechanism(s) by which this exposure produces behavioral abnormalities is unclear. OBJECTIVE We hypothesized that the lasting effects of neonatal SSRI exposure are a consequence of abnormal stimulation of 5-HT1A and/or 5-HT1B receptors during brain development. We examined whether such stimulation would result in lasting sensory and social deficits in rats in a manner similar to SSRIs using both direct agonist stimulation of receptors as well as selective antagonism of these receptors during SSRI exposure. METHODS Male and female rat pups were treated from postnatal days 8 to 21. In Experiment 1, pups received citalopram (20 mg/kg/day), saline, (±)-8-hydroxy-dipropylaminotetralin hydrobromide (8-OH-DPAT; 0.5 mg/kg/day) or 7-trifluoromethyl-4(4-methyl-1-piperazinyl)-pyrrolo[1,2-a]-quinoxaline dimaleate (CGS-12066B; 10 mg/kg/day). In Experiment 2, a separate cohort of pups received citalopram (20 mg/kg/day), or saline which was combined with either N-[2-[4-(2-methoxyphenyl)-1-piperazinyl]ethyl]-N-2-pyridinylcyclo-hexanecarboxamide maleate (WAY-100635; 0.6 mg/kg/day) or N-[4-methoxy-3-(4-methyl-1-piperazinyl)phenyl]-2'-methyl-4'-(5-methyl-1,2,4-oxadiazol-3-yl)-1-1'-biphenyl-4-carboxamide (GR-127935; 6 mg/kg/day) or vehicle. Rats were then tested in paradigms designed to assess sensory and social response behaviors at different time points during development. RESULTS Direct and indirect neonatal stimulation of 5-HT1A or 5-HT1B receptors disrupts sensory processing, produces neophobia, increases stereotypic activity, and impairs social interactions in manner analogous to that observed in ASD. CONCLUSION Increased stimulation of 5-HT1A and 5-HT1B receptors plays a significant role in the production of lasting social and sensory deficits in adult animals exposed as neonates to SSRIs.
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Olivier JDA, Akerud H, Kaihola H, Pawluski JL, Skalkidou A, Högberg U, Sundström-Poromaa I. The effects of maternal depression and maternal selective serotonin reuptake inhibitor exposure on offspring. Front Cell Neurosci 2013; 7:73. [PMID: 23734100 PMCID: PMC3659337 DOI: 10.3389/fncel.2013.00073] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Accepted: 05/01/2013] [Indexed: 01/05/2023] Open
Abstract
It has been estimated that 20% of pregnant women suffer from depression and it is well-documented that maternal depression can have long-lasting effects on the child. Currently, common treatment for maternal depression has been the selective serotonin reuptake inhibitor medications (SSRIs) which are used by 2–3% of pregnant women in the Nordic countries and by up to 10% of pregnant women in the United States. Antidepressants cross the placenta and are transferred to the fetus, thus, the question arises as to whether children of women taking antidepressants are at risk for altered neurodevelopmental outcomes and, if so, whether the risks are due to SSRI medication exposure or to the underlying maternal depression. This review considers the effects of maternal depression and SSRI exposure on offspring development in both clinical and preclinical populations. As it is impossible in humans to study the effects of SSRIs without taking into account the possible underlying effects of maternal depression (healthy pregnant women do not take SSRIs), animal models are of great value. For example, rodents can be used to determine the effects of maternal depression and/or perinatal SSRI exposure on offspring outcomes. Unraveling the joint (or separate) effects of maternal depression and SSRI exposure will provide more insights into the risks or benefits of SSRI exposure during gestation and will help women make informed decisions about using SSRIs during pregnancy.
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Affiliation(s)
- J D A Olivier
- Department of Women's and Children's Health, Uppsala University Uppsala, Sweden ; Center for Gender Medicine, Karolinska Institutet Stockholm, Sweden
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Kim JW, Ahn HS, Baik JH, Yoon BJ. Administration of clomipramine to neonatal mice alters stress response behavior and serotonergic gene expressions in adult mice. J Psychopharmacol 2013; 27:171-80. [PMID: 22992375 DOI: 10.1177/0269881112460107] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Early life exposure to antidepressants frequently occurs when pregnant mothers take the medication during late pregnancy. Previous studies in animal models have shown that early exposure to certain antidepressants can alter some behaviors in adulthood. We examined whether the administration of clomipramine, a serotonin reuptake inhibitor, to neonatal mice could result in depression-related behavioral alterations in adult mice. In addition, in an attempt to uncover the mechanism underlying these behavioral changes, we examined the expression of candidate genes in different areas of the brain. Here we show that mice chronically injected with clomipramine specifically during early postnatal development demonstrated depression-like behavior as well as altered stress responses in adulthood. An analysis of the expression of serotonergic genes after exposure to social defeat stress revealed small but significant changes in the expression of 5-HT1A receptor gene (Htr1a) and 5-HTT gene (Slc6a4) in the mice treated with clomipramine compared with the mice injected with saline. We concluded that antidepressant exposure in early days of life could alter stress-related behavior in adulthood and that the behavioral alterations are accompanied by altered serotonergic gene expressions.
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Affiliation(s)
- Jae-Won Kim
- Division of Life Science, School of Life Sciences and Biotechnology, Korea University, Anam-Dong, Seoul, Korea
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28
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Fujimoto T, Kubo K, Nishikawa Y, Aou S. Postnatal exposure to low-dose bisphenol A influences various emotional conditions. J Toxicol Sci 2013; 38:539-46. [DOI: 10.2131/jts.38.539] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
| | - Kazuhiko Kubo
- Department of Otorhinolaryngology, Graduate School of Medical Sciences, Kyushu University
| | | | - Shuji Aou
- Deptartment of Brain Science and Engineering, Kyushu Institute of Technology
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McDowell AL, Strohl KP, Feng P. Sleep-related epilepsy in a Long-Evans hooded rat model of depression. Sleep Breath 2012; 16:1181-91. [PMID: 22205358 DOI: 10.1007/s11325-011-0630-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Revised: 11/28/2011] [Accepted: 12/01/2011] [Indexed: 11/28/2022]
Abstract
INTRODUCTION Neonatal treatment with clomipramine (CLI) has been shown to have reliable behavioral and biological changes that mimic major symptomatic and biochemical changes found in depression. This paper further explores a common feature of depression, the comorbidity of seizure activity and depressive behaviors in this mode. METHODS Rat pups were neonatally treated with 40 mg/kg/day of CLI from postnatal day 8 through 21. In adulthood, they were instrumented with electroencephalographic (EEG) and electromyographic (EMG) electrodes for 24 h of polysomnogram (PSG) recordings. PSG data were analyzed for: (1) sleep-wake cycle; (2) spectral power; and (3) epileptiform activity, including NREM-to-REM transition (NRT) bursts. RESULTS Neonatal treatment with CLI reliably produces enhanced levels of REM (p < 0.01) and reduced sexual activity (p < 0.05). Theta power was enhanced during NREM sleep in the CLI group (p = 0.02). CLI-treated animals experienced increased frequency at the NRT (p < 0.01), as well as additional epileptiform activity of continuous (CTS; p < 0.05) and petite-continuous (P-CTS; p < 0.01) types, across the sleep-wake cycle. There is a strong temporal correlation with increased REM sleep duration, increased frequency of NRT bursts, and increased theta power during NREM sleep in CLI-treated animals. DISCUSSION Neonatal CLI-treated animals experienced significantly more epileptiform activity as a whole, in addition to comorbid features of depression in adulthood. Neonatal exposure to CLI will not only produce depressive phenotype but may also enhance risk for epilepsy in some individuals. This warrants further investigation into currently acceptable medicinal use in humans.
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Affiliation(s)
- Angela L McDowell
- Division of Pulmonary, Critical Care and Sleep Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
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Lagus M, Gass N, Saharinen J, Savelyev S, Porkka-Heiskanen T, Paunio T. Inter-tissue networks between the basal forebrain, hippocampus, and prefrontal cortex in a model for depression caused by disturbed sleep. J Neurogenet 2012; 26:397-412. [PMID: 22783900 DOI: 10.3109/01677063.2012.694932] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Disturbances in sleep are encountered in the majority of patients with depressive disorder. To elucidate the molecular mechanisms behind this relationship, we examined gene expression changes in a rodent model for disturbed sleep and depression. The animals were treated with daily injections of clomipramine to affect their sleep during early infancy. This early interference with sleep is known to induce depression-like behavior in adult animals. After 2 weeks of treatment, the change in gene expression was examined using the Affymetrix Rat 230.2 chip. We studied the gene expression in the basal forebrain, hippocampus, and frontal cortex and combined the results to reveal the otherwise indissectible networks between and around the tissues. The major disrupted pathways between the three brain areas were related to synaptic transmission, regulation of translation, and ubiquitinylation. The involved pathways were within the cellular components of the axons, growth cones, melanosomes, and pigment granules. A network analysis allowing for additional interactors, in the form of chemicals or gene products, revealed a disturbed communicational network between the different brain areas. This disturbed network is centered around serotonin, Mn(II), and Rhoa. The findings elucidate inter-tissue pathways and networks in the brain that are involved in sleep and mood regulation. The findings are of uttermost interest, some are quite predictable and obvious, but some are novel or have only been proposed by rare theoretical speculations (such as the melanosome and Mn(II) involvement). Equally important as the findings are the methods described in this article. In this study, we present two novel simple ways to perform system biological analysis based on gene expression array data. We used two already existing tools in a new way, and by careful planning of the input data, managed to extrapolate intricate hidden inter-tissue networks to build a molecular picture of disease.
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Affiliation(s)
- Markus Lagus
- Public Health Genomics Unit and Institute for Molecular Medicine FIMM, National Institute for Health and Welfare, Helsinki, Finland
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Savelyev SA, Rantamäki T, Rytkönen KM, Castren E, Porkka-Heiskanen T. Sleep homeostasis and depression: studies with the rat clomipramine model of depression. Neuroscience 2012; 212:149-58. [PMID: 22516018 DOI: 10.1016/j.neuroscience.2012.03.029] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Revised: 03/22/2012] [Accepted: 03/23/2012] [Indexed: 12/17/2022]
Abstract
Neonatal treatment of rat pups with clomipramine (CLI) has been shown to cause long-lasting and persistent depression-related behaviors and changes in sleep architecture and in brain-derived neurotrophic factor (BDNF) signaling in adult animals, producing an animal model of depression. However, the molecular mechanisms which mediate these effects of early-life CLI treatment on adult animals remain largely unknown. In order to characterize these further, we investigated in neonatally CLI-treated rats the sleep architecture as well as the extracellular and cellular levels of sleep regulators (nitric oxide, adenosine) and BDNF, respectively, in the basal forebrain (BF), i.e. the brain area which is implicated in sleep and depression. We found that CLI-treated rats exhibited a disturbed sleep architecture (REM sleep fragmentation was increased and NREM periods preceding REM were shorter) and reduced levels of BDNF and adenosine in the BF, whereas the levels of nitric oxide were elevated. Next, we examined sleep deprivation (SD)-induced homeostatic responses on sleep regulation and brain BDNF levels in CLI-treated rats. Compared to control rats, 3h of SD induced a smaller increase in the amount of NREM sleep during sleep recovery. At the molecular level, the normal homeostatic response was dissociated: the rise in the adenosine level was not accompanied by a rise in the nitric oxide concentration. Moreover, while BF BDNF levels decreased during SD in control rats, such a decline was not observed in CLI rats. Taken together, neonatal CLI treatment produces long-lasting functional changes in the sleep architecture and sleep regulation in adult rats, accompanied by dysregulated BDNF signaling in the BF.
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Affiliation(s)
- S A Savelyev
- Institute of Biomedicine, Department of Physiology, University of Helsinki, P.O. Box 63 (Haartmaninkatu 8), 00014 Helsinki, Finland.
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Axelin A, Kirjavainen J, Salanterä S, Lehtonen L. Effects of pain management on sleep in preterm infants. Eur J Pain 2012; 14:752-8. [DOI: 10.1016/j.ejpain.2009.11.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2009] [Revised: 11/09/2009] [Accepted: 11/22/2009] [Indexed: 11/24/2022]
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Frank MG. Sleep and developmental plasticity not just for kids. PROGRESS IN BRAIN RESEARCH 2012; 193:221-32. [PMID: 21854965 DOI: 10.1016/b978-0-444-53839-0.00014-4] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
In a variety of mammalian species, sleep amounts are highest during developmental periods of rapid brain development and synaptic plasticity than at any other time in life [Frank, M. G. & Heller, H. C. (1997a). Development of REM and slow wave sleep in the rat. American Journal of Physiology, 272, R1792-R1799; Jouvet-Mounier, D., Astic, L., & Lacote, D. (1970). Ontogenesis of the states of sleep in rat, cat and guinea pig during the first postnatal month. Developmental Psychobiology, 2, 216-239; Roffwarg, H. P., Muzio, J. N., & Dement, W. C. (1966). Ontogenetic development of the human sleep-dream cycle. Science, 604-619]. Many of the mechanisms governing developmental plasticity also mediate plasticity in the adult brain. Therefore, studying the role of sleep in developmental plasticity may provide insights more generally into sleep function across the lifespan. In this chapter, I review the evidence that supports a critical role for sleep in developmental brain plasticity. I begin with an overview of past studies that support a role for sleep in general brain maturation. This is followed by more recent findings in the developing visual cortex that more specifically address a possible role for sleep in cortical plasticity.
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Affiliation(s)
- Marcos Gabriel Frank
- Department of Neuroscience, School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
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Harris SS, Maciag D, Simpson KL, Lin RCS, Paul IA. Dose-dependent effects of neonatal SSRI exposure on adult behavior in the rat. Brain Res 2012; 1429:52-60. [PMID: 22079319 PMCID: PMC3228278 DOI: 10.1016/j.brainres.2011.10.025] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Revised: 10/11/2011] [Accepted: 10/13/2011] [Indexed: 10/16/2022]
Abstract
Neonatal exposure to antidepressants produces lasting impairments in male sexual behavior. Although perturbation of the serotonin system during neonatal life has been implicated in the long-term behavioral effects of neonatal antidepressant exposure, dose-response studies were necessary to confirm that inhibition of the serotonin transporter during the neonatal period is sufficient to produce impairments in sexual behavior. Therefore, the present study examined the dose-response effects of neonatal citalopram exposure on sexual behavior. In addition, the effects of exposure on anxiety-related behavior were examined since alterations in this behavioral measure could affect sexual behavior. Male Long-Evans rats were injected subcutaneously with citalopram (CTM) in one of three doses (5, 10 or 20mg/kg/d), or saline (SAL) in a volume of 0.1 ml twice daily (07:00 and 14:00 h) from PD8 to PD21. The rats were tested as adults (>PD90) for anxiety-like behavior and exploration in the elevated plus maze test and sexual behavior. Neonatal citalopram exposure produced persistent reductions in male sexual behavior characterized by significant dose-dependent reductions in the percentage of male rats displaying mounting as well as dose-dependent reductions in the number of mounts and mount latency. Neonatal citalopram exposure also produced significant dose-dependent linear trends for reductions in intromission and ejaculation behavior. However, neonatal SSRI exposure was not found to produce any effects on exploration or anxiety-like behavior in the elevated plus maze test. The present findings support the hypothesis that inhibition of the serotonin transporter during neonatal life by an SSRI is directly responsible for the long-term effects on male sexual behavior.
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Affiliation(s)
- Sharonda S Harris
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center Jackson, Ms, USA
| | - Dorota Maciag
- Department of Psychiatry, University of Mississippi Medical Center Jackson, Ms, USA
| | - Kimberly L Simpson
- Department of Anatomy, University of Mississippi Medical Center Jackson, Ms, USA
| | - Rick CS Lin
- Department of Anatomy, University of Mississippi Medical Center Jackson, Ms, USA
| | - Ian A Paul
- Department of Psychiatry, University of Mississippi Medical Center Jackson, Ms, USA
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Darling RD, Alzghoul L, Zhang J, Khatri N, Paul IA, Simpson KL, Lin RCS. Perinatal citalopram exposure selectively increases locus ceruleus circuit function in male rats. J Neurosci 2011; 31:16709-15. [PMID: 22090498 PMCID: PMC3312583 DOI: 10.1523/jneurosci.3736-11.2011] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2011] [Revised: 08/31/2011] [Accepted: 09/06/2011] [Indexed: 01/26/2023] Open
Abstract
Selective serotonin reuptake inhibitors (SSRIs), such as citalopram (CTM), have been widely prescribed for major depressive disorder, not only for adult populations, but also for children and pregnant mothers. Recent evidence suggests that chronic SSRI exposure in adults increases serotonin (5-HT) levels in the raphe system and decreases norepinephrine (NE) locus ceruleus (LC) neural activity, suggesting a robust opposing interaction between these two monoamines. In contrast, perinatal SSRI exposure induces a long-lasting downregulation of the 5-HT-raphe system, which is opposite to that seen with chronic adult treatment. Therefore, the goal of the present investigation was to test the hypothesis that perinatal CTM exposure (20 mg/kg/d) from postnatal day 1 (PN1) to PN10 leads to hyperexcited NE-LC circuit function in adult rats (>PN90). Our single-neuron LC electrophysiological data demonstrated an increase in spontaneous and stimulus-driven neural activity, including an increase in phasic bursts in CTM-exposed animals. In addition, we demonstrated a corresponding immunoreactive increase in the rate-limiting catalyzing catecholamine enzyme (tyrosine hydroxylase) within the LC and their neocortical target sites compared to saline controls. Moreover, these effects were only evident in male exposed rats, suggesting a sexual dimorphism in neural development after SSRI exposure. Together, these results indicate that administration of SSRIs during a sensitive period of brain development results in long-lasting alterations in NE-LC circuit function in adults and may be useful in understanding the etiology of pervasive developmental disorders such as autism spectrum disorder.
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Affiliation(s)
| | | | - Junlin Zhang
- Department of Neurobiology and Anatomical Sciences
| | | | - Ian A. Paul
- Departments of Pharmacology and Toxicology and
- Psychiatry and Human Behavior, University of Mississippi Medical Center, Jackson, Mississippi 39216
| | - Kimberly L. Simpson
- Department of Neurobiology and Anatomical Sciences
- Psychiatry and Human Behavior, University of Mississippi Medical Center, Jackson, Mississippi 39216
| | - Rick C. S. Lin
- Department of Neurobiology and Anatomical Sciences
- Psychiatry and Human Behavior, University of Mississippi Medical Center, Jackson, Mississippi 39216
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Olivier JDA, Vallès A, van Heesch F, Afrasiab-Middelman A, Roelofs JJPM, Jonkers M, Peeters EJ, Korte-Bouws GAH, Dederen JP, Kiliaan AJ, Martens GJ, Schubert D, Homberg JR. Fluoxetine administration to pregnant rats increases anxiety-related behavior in the offspring. Psychopharmacology (Berl) 2011; 217:419-32. [PMID: 21487650 DOI: 10.1007/s00213-011-2299-z] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Accepted: 03/30/2011] [Indexed: 01/14/2023]
Abstract
RATIONALE Fluoxetine (Prozac®) is the most frequently prescribed drug to battle depression in pregnant women, but its safety in the unborn child has not yet been established. Fluoxetine, a selective serotonin reuptake inhibitor, crosses the placenta, leading to increased extracellular serotonin levels and potentially neurodevelopmental changes in the fetus. OBJECTIVES The purpose of this study was to elucidate the long-term consequences of prenatal fluoxetine in rats. METHODS Pregnant rats were injected daily with 12 mg/kg fluoxetine or vehicle from gestational day 11 until birth, and the behavior of the offspring was monitored. RESULTS Plasma fluoxetine transfer from mother to pup was 83%, and high levels of fluoxetine (13.0 μg/g) were detected in the pup brain 5 h after the last injection. Fluoxetine-treated dams gave birth to litters 15% smaller than usual and to pups of reduced weight (until postnatal day 7). Furthermore, prenatal fluoxetine exposure significantly increased anxiety in the novelty-suppressed feeding test, the footshock-induced conditioned place aversion test, and the elevated plus maze test (following footshock pre-exposure) during adulthood, and also significantly decreased components of social play behavior at 4 weeks of age, and a strong tendency for increased self-grooming and making less contact in adults. Behavioral despair, anhedonia, and sexual behavior were not different between treatment groups. Finally, the hypothermic response to the 5-HT(1A) agonist flesinoxan was observed at a lower dose in prenatally fluoxetine-exposed rats than in controls. CONCLUSIONS Prenatal fluoxetine exposure in rats leads to detrimental behavioral outcomes in later life, which may partly be due to altered 5-HT(1A) receptor signaling.
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Affiliation(s)
- Jocelien D A Olivier
- Donders Institute for Brain, Cognition, and Behaviour, Centre for Neuroscience, Department of Cognitive Neuroscience, Radboud University Nijmegen Medical Centre, Geert Grooteplein 21 (route 126), 6525, EZ, Nijmegen, The Netherlands
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Rodriguez-Porcel F, Green D, Khatri N, Harris SS, May WL, Lin RCS, Paul IA. Neonatal exposure of rats to antidepressants affects behavioral reactions to novelty and social interactions in a manner analogous to autistic spectrum disorders. Anat Rec (Hoboken) 2011; 294:1726-35. [PMID: 21905242 DOI: 10.1002/ar.21402] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2010] [Revised: 03/09/2011] [Accepted: 03/10/2011] [Indexed: 11/11/2022]
Abstract
We have demonstrated that neonatal exposure to selective serotonin reuptake inhibitors has lasting effects on behavior and serotonergic neurons in Long Evans rats. Hyperserotoninemia and altered sensory processing are reported in autistic spectrum disorders (ASD). We hypothesized that early life exposure to SSRIs alters sensory processing, disrupts responses to novelty, and impairs social interactions in a manner similar to that observed in ASD. Male and female Long-Evans rat pups were administered citalopram, buproprion, fluoxetine, or saline from postnatal day (P) 8-21. Rats were tested for response to a novel tone before weaning (P25). Later, rats were tested 2× for response to a novel object (P39), and to a novel conspecific (P78, P101). In addition, rats were assessed for juvenile play behaviors (P32-P34) and later, we assessed sexual response to an estrus female in male rats (P153-184). Antidepressant exposure increased freezing after tone, diminished novel object exploration, and reduced conspecific interaction up to 3× compared to saline exposed rats. Juvenile play was profoundly reduced in antidepressant-exposed males when compared to saline exposed groups. Exposure to the SSRIs, but not bupropion disrupted male sexual behaviors. Moreover, specific male responses to female proceptive behaviors were disrupted in SSRI, but not bupropion exposed rats. We conclude that neonatal exposure to antidepressants in rats results in sensory and social abnormalities that parallel many of those reported in ASD.
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Affiliation(s)
- Federico Rodriguez-Porcel
- Department of Psychiatry & Human Behavior, University of Mississippi Medical Center, Jackson, 39216-4505, USA
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Olivier JDA, Blom T, Arentsen T, Homberg JR. The age-dependent effects of selective serotonin reuptake inhibitors in humans and rodents: A review. Prog Neuropsychopharmacol Biol Psychiatry 2011; 35:1400-8. [PMID: 20883714 DOI: 10.1016/j.pnpbp.2010.09.013] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2010] [Revised: 08/07/2010] [Accepted: 09/15/2010] [Indexed: 01/27/2023]
Abstract
The selective serotonin reuptake inhibitor (SSRI) Prozac® (fluoxetine) is widely prescribed for the treatment of depression and anxiety-related disorders. While extensive research has established that fluoxetine is safe for adults, safety is not guaranteed for (unborn) children and adolescents. Some clinical studies have reported adverse outcomes, such as premature birth, neonatal cardiovascular abnormalities, and pulmonary hypertension in children whose mothers used SSRIs during pregnancy. In addition, several reports show that adolescent fluoxetine treatment increases risk for suicidal behavior. Despite these studies, fluoxetine is not contraindicated in the treatment of depressed pregnant women and adolescents. Longitudinal research in humans is limited because of ethical reasons and time constraints, and to overcome these limitations, rodents are used to increase insight in the age-dependent effects of fluoxetine exposure. It has been established that neonatal and adolescent fluoxetine exposure leads to paradoxical anxiety- and depression-like features in later life of rats and mice, although in some studies adolescent fluoxetine exposure was without effects. These age-dependent outcomes of fluoxetine may be explained by serotonin's neurotrophic effects, which may vary according to the developmental stage of the brain due to epigenetic modifications. Here we review the existing evidence for the age-dependent effects of fluoxetine in humans and rodents, address the gaps in our current knowledge and propose directions for future research. Given the overlap between human and rodent findings, rodents provide heuristic value in further research on the age-dependent effects of SSRIs.
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Affiliation(s)
- J D A Olivier
- Donders Institute for Brain, Cognition, and Behaviour, Centre for Neuroscience, Dept. of Cognitive Neuroscience, Radboud University Nijmegen Medical Centre, Geert Grooteplein 21, 6525 GA Nijmegen, The Netherlands
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Abstract
Current antidepressants still display unsatisfactory efficacy and a delayed onset of therapeutic action. Here we show that the pharmacological blockade of serotonin 7 (5-HT(7)) receptors produced a faster antidepressant-like response than the commonly prescribed antidepressant fluoxetine. In the rat, the selective 5-HT(7) receptor antagonist SB-269970 counteracted the anxiogenic-like effect of fluoxetine in the open field and exerted an antidepressant-like effect in the forced swim test. In vivo, 5-HT(7) receptors negatively regulate the firing activity of dorsal raphe 5-HT neurons and become desensitized after long-term administration of fluoxetine. In contrast with fluoxetine, a 1-week treatment with SB-269970 did not alter 5-HT firing activity but desensitized cell body 5-HT autoreceptors, enhanced the hippocampal cell proliferation, and counteracted the depressive-like behavior in olfactory bulbectomized rats. Finally, unlike fluoxetine, early-life administration of SB-269970, did not induce anxious/depressive-like behaviors in adulthood. Together, these findings indicate that the 5-HT(7) receptor antagonists may represent a new class of antidepressants with faster therapeutic action.
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Andersen SL, Navalta CP. Annual Research Review: New frontiers in developmental neuropharmacology: can long-term therapeutic effects of drugs be optimized through carefully timed early intervention? J Child Psychol Psychiatry 2011; 52:476-503. [PMID: 21309771 PMCID: PMC3115525 DOI: 10.1111/j.1469-7610.2011.02376.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Our aim is to present a working model that may serve as a valuable heuristic to predict enduring effects of drugs when administered during development. Our primary tenet is that a greater understanding of neurodevelopment can lead to improved treatment that intervenes early in the progression of a given disorder and prevents symptoms from manifesting. The immature brain undergoes significant changes during the transitions between childhood, adolescence, and adulthood. Such changes in innervation, neurotransmitter levels, and their respective signaling mechanisms have profound and observable changes on typical behavior, but also increase vulnerability to psychiatric disorders when the maturational process goes awry. Given the remarkable plasticity of the immature brain to adapt to its external milieu, preventive interventions may be possible. We intend for this review to initiate a discussion of how currently used psychotropic agents can influence brain development. Drug exposure during sensitive periods may have beneficial long-term effects, but harmful delayed consequences may be possible as well. Regardless of the outcome, this information needs to be used to improve or develop alternative approaches for the treatment of childhood disorders. With this framework in mind, we present what is known about the effects of stimulants, antidepressants, and antipsychotics on brain maturation (including animal studies that use more clinically-relevant dosing paradigms or relevant animal models). We endeavor to provocatively set the stage for altering treatment approaches for improving mental health in non-adult populations.
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Affiliation(s)
- Susan L. Andersen
- Laboratory for Developmental Neuropharmacology, Department of Psychiatry, McLean Hospital, Harvard Medical School
| | - Carryl P. Navalta
- Program for Behavioral Science, Department of Psychiatry, Children’s Hospital Boston, Harvard Medical School
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Weaver KJ, Paul IA, Lin RCS, Simpson KL. Neonatal exposure to citalopram selectively alters the expression of the serotonin transporter in the hippocampus: dose-dependent effects. Anat Rec (Hoboken) 2011; 293:1920-32. [PMID: 20830689 DOI: 10.1002/ar.21245] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Infants born to mothers taking selective serotonin reuptake inhibitors (SSRIs) late in pregnancy have been reported to exhibit signs of antidepressant withdrawal. Such evidence suggests that these drugs access the fetal brain in utero at biologically significant levels. Recent studies in rodents have revealed that early exposure to antidepressants can lead to long lasting abnormalities in adult behaviors, and result in robust decreases in the expression of a major serotonin synthetic enzyme (tryptophan hydroxylase) along the raphe midline. In the present investigation, we injected rat pups with citalopram (CTM: 5 mg/kg, 10 mg/kg, and 20 mg/kg) from postnatal Days 8-21, and examined serotonin transporter (SERT) labeling in the hippocampus, ventrobasal thalamic complex, and caudate-putamen when the subjects reached adulthood. Our data support the idea, that forebrain targets in receipt of innervation from the raphe midline are particularly vulnerable to the effects of CTM. SERT-immunoreactive fiber density was preferentially decreased throughout all sectors of the hippocampal formation, whereas the subcortical structures, each supplied by more lateral and rostral aspects of the raphe complex, respectively, were not significantly affected. Reductions in SERT staining were also found to be dose-dependent. These findings suggest that SSRIs may not only interfere with the establishment of chemically balanced circuits in the neonate but also impose selective impairment on higher cortical function and cognitive processes via more circumscribed (i.e., regionally specific) deficits in 5-HT action.
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Affiliation(s)
- Kristin J Weaver
- Department of Anatomy, University of Mississippi Medical Center, Jackson, Mississippi, USA
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Lagus M, Gass N, Saharinen J, Saarela J, Porkka-Heiskanen T, Paunio T. Gene expression patterns in a rodent model for depression. Eur J Neurosci 2010; 31:1465-73. [DOI: 10.1111/j.1460-9568.2010.07166.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Abstract
The idea that sleep might be involved in brain plasticity has been investigated for many years through a large number of animal and human studies, but evidence remains fragmentary. Large amounts of sleep in early life suggest that sleep may play a role in brain maturation. In particular, the influence of sleep in developing the visual system has been highlighted. The current data suggest that both Rapid Eye Movement (REM) and non-REM sleep states would be important for brain development. Such findings stress the need for optimal paediatric sleep management. In the adult brain, the role of sleep in learning and memory is emphasized by studies at behavioural, systems, cellular and molecular levels. First, sleep amounts are reported to increase following a learning task and sleep deprivation impairs task acquisition and consolidation. At the systems level, neurophysiological studies suggest possible mechanisms for the consolidation of memory traces. These imply both thalamocortical and hippocampo-neocortical networks. Similarly, neuroimaging techniques demonstrated the experience-dependent changes in cerebral activity during sleep. Finally, recent works show the modulation during sleep of cerebral protein synthesis and expression of genes involved in neuronal plasticity.
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Affiliation(s)
- T T Dang-Vu
- Cyclotron Research Centre, University of Liege, Belgium.
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Feng P, Hu Y, Li D, Vurbic D, Fan H, Wang S, Strohl KP. The effect of clomipramine on wake/sleep and orexinergic expression in rats. J Psychopharmacol 2009; 23:559-66. [PMID: 18562438 PMCID: PMC3564512 DOI: 10.1177/0269881108089606] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
We have previously found that neonatal treatment with clomipramine (CLI) induced a decrease in brain orexins during the juvenile period and that these changes were reversed at adulthood. This study investigated the effect of CLI on the orexinergic component and sleep/wake states. Two groups of adult male rats were conducted for 48-h polysomnographic recording. One group of rats was treated with CLI (20 mg/kg every 12 h), and a second group was treated with equivolume of saline (SAL) simultaneously after the first 24 h of polysomnographic recording. Rats were killed 2 h after the third dose of treatment. Brain tissues were collected for radioimmunoassay quantification of orexins and real-time PCR analysis of prepro-orexin and orexin receptor mRNA. The CLI group had significantly shorter rapid eye movement (REM) sleep and longer REM latency compared with both the baseline day and the SAL group and had significantly less active wake and more quiet wake. Compared with the control rats, the CLI rats had significantly higher mRNA expression of prepro-orexin in the hypothalamus and the frontal cortex, but not in the hippocampus. The CLI rats also had significantly less orexin B in the hypothalamus than the control rats. These results suggest that suppression of active wake and orexin B by CLI may be a factor responsible for CLI-induced depression and that the increase of prepro-orexin mRNA may be a sign of increased brain orexins found in this model.
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Affiliation(s)
- P Feng
- Department of Physiology, School of Medicine, Zhengzhou University, Zhengzhou, China.
| | - Y Hu
- Pulmonary and Critical Care Division, Department of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
| | - D Li
- Department of Physiology, School of Medicine, Zhengzhou University, Zhengzhou, China
| | - D Vurbic
- Pulmonary and Critical Care Division, Department of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
| | - H Fan
- Department of Physiology, School of Medicine, Zhengzhou University, Zhengzhou, China
| | - S Wang
- Department of Physiology, School of Medicine, Zhengzhou University, Zhengzhou, China
| | - KP Strohl
- Pulmonary and Critical Care Division, Department of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
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Revel FG, Gottowik J, Gatti S, Wettstein JG, Moreau JL. Rodent models of insomnia: A review of experimental procedures that induce sleep disturbances. Neurosci Biobehav Rev 2009; 33:874-99. [DOI: 10.1016/j.neubiorev.2009.03.002] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Revised: 03/04/2009] [Accepted: 03/04/2009] [Indexed: 12/21/2022]
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Feng P, Vurbic D, Wu Z, Hu Y, Strohl KP. Changes in brain orexin levels in a rat model of depression induced by neonatal administration of clomipramine. J Psychopharmacol 2008; 22:784-91. [PMID: 18753273 PMCID: PMC3580265 DOI: 10.1177/0269881106082899] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Depression is associated with a deficiency of serotonergic neurons that have been found to suppress orexinergic neurons, which in turn activate these neurons in a feedback loop. This evidence suggests that orexins may be involved in the pathology of depression. Long Evans rats were treated with clomipramine (CLI) and saline (SAL) from postnatal days 8 through 21. One set of rats from both groups was sacrificed at 35 days of age for quantification of orexins in multiple brain regions. At 3-4 months of age a second set of rats was tested for immobility in a forced swim procedure, a common test for depressive signs in rats, and a third set was sacrificed for the quantification of orexins. Compared with the control rats, adult rats with neonatal CLI treatment had (1) increased forced swim immobility and (2) increased orexins A and B in the hypothalamus. However, both orexins A and B levels were decreased in multiple brain regions in the juvenile CLI rats compared with same-age controls. We concluded that although orexin levels were decreased in juvenile CLI rats, adult CLI rats with features of depression had significantly higher levels of hypothalamic orexins compared with adult controls. These results imply that orexins are likely to be involved in the pathological regulation of depression.
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Affiliation(s)
- P. Feng
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Case Western Reserve University, Department of Psychiatry, Case Western Reserve University; Louis Stokes VA Medical Center, Cleveland, OH, USA
| | - D. Vurbic
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Case Western Reserve University; Louis Stokes VA Medical Center, Cleveland, OH, USA
| | - Z. Wu
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Case Western Reserve University; Louis Stokes VA Medical Center, Cleveland, OH, USA
| | - Y. Hu
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Case Western Reserve University; Louis Stokes VA Medical Center, Cleveland, OH, USA
| | - KP. Strohl
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Case Western Reserve University; Louis Stokes VA Medical Center, Cleveland, OH, USA
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47
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Abstract
The development of the fetal lung compared to that of other organs is unusual in the degree of its dependence on extrinsic stimuli. When the space available to the growing lung is limited by space-occupying lesions or when the diaphragm is paralysed, lung growth is markedly impaired. The relationship of lung volume to growth may depend on lung distension. Lung hypoplasia associated with experimental procedures causing inhibition or blunting of fetal breathing movements suggests that the distending forces may be generated by these movements. Maturation is less dependent on distension and more dependent on the hormonal environment. Distensibility and stability of the lung in fetal sheep develops rapidly within a few days of birth and correlates strongly with the plasma cortisol concentration. Hypophysectomy retards mutation which is restored by infusing adrenocorticotropin but not cortisol into the fetus. The hormones mainly responsible for controlling the various aspects of maturation probably include cortisol, iodothyronines and catecholamines but the interrelationships of these hormones and the extent of involvement of other hormones is uncertain.
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48
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Lasting syndrome of depression produced by reduction in serotonin uptake during postnatal development: evidence from sleep, stress, and behavior. J Neurosci 2008; 28:3546-54. [PMID: 18385313 DOI: 10.1523/jneurosci.4006-07.2008] [Citation(s) in RCA: 134] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Dysfunction of the serotonin system is implicated in sleep and emotional disorders. To test whether these impairments could arise during development, we studied the impact of early-life, transient versus genetic, permanent alterations of serotonin reuptake on sleep-wakefulness patterns, depression-related behavior, and associated physiological features. Here, we show that female mice treated neonatally with a highly selective serotonin reuptake inhibitor, escitalopram, exhibited signs of depression in the form of sleep anomalies, anhedonia, increased helplessness reversed by chronic antidepressant treatment, enhanced response to acute stress, and increased serotoninergic autoinhibitory feedback. This syndrome was not reproduced by treatment in naive adults but resembled the phenotype of mutant mice lacking the serotonin transporter, except that these exhibited decreased serotonin autoreceptor sensitivity and additional anxiety-like behavior. Thus, alteration of serotonin reuptake during development, whether induced by external or genetic factors, causes a depressive syndrome lasting into adulthood. Such early-life impairments might predispose individuals to sleep and/or mood disorders.
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49
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The development of potentially better practices to support the neurodevelopment of infants in the NICU. J Perinatol 2007; 27 Suppl 2:S48-74. [PMID: 18034182 DOI: 10.1038/sj.jp.7211844] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE To review the existing evidence used to identify potentially better care practices that support newborn brain development. STUDY DESIGN Literature review. RESULT Sixteen potentially better practices are identified and grouped into two operational clinical bundles based upon timing for recommended implementation. CONCLUSION Existing evidence supports the implementation of selected care practices that potentially may support newborn brain development.
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50
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Cryan JF, Thakker DR, Hoyer D. Emerging use of non-viral RNA interference in the brain. Biochem Soc Trans 2007; 35:411-5. [PMID: 17371288 DOI: 10.1042/bst0350411] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Psychiatric and neurological disorders are among the most complex, poorly understood and debilitating diseases in medicine. Abrogating gene function using knockout animals is one of the primary means of examining the pathophysiological significance of a given gene product and has been used successfully in models of neuropsychiatric disorders. However, the developmental compensations that may potentially arise from such approaches are problematic and difficult to assess. The recent discovery of RNAi (RNA interference), as a highly efficient method for gene knockdown, has opened up the possibility for its application in examining the potential role of genes in adult brain function and/or disorders. Recent efforts have focused on applying RNAi-based knockdown to understand the genes implicated in neuropsychiatric disorders. We have developed a method of gene knockdown involving chronic infusion of siRNA (short interfering RNA) using osmotic minipumps. We have silenced a number of genes including those for the serotonin and dopamine transporter. Such tailoring of tools that deliver RNAi in the brain will significantly aid in our understanding of the complex pathophysiology of neuropsychiatric disorders where there is an immensely unmet medical need.
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Affiliation(s)
- J F Cryan
- School of Pharmacy, Cavanagh Pharmacy Building, University College Cork, Cork, Ireland.
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