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Gallo MT, Brivio P, Dolci B, Fumagalli F, Calabrese F. Perinatal serotonergic manipulation shapes anhedonic and cognitive behaviors in a sex- and age-dependent manner: Identification of related biological functions at central and peripheral level. Brain Behav Immun 2023; 114:118-130. [PMID: 37595877 DOI: 10.1016/j.bbi.2023.08.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 08/11/2023] [Accepted: 08/15/2023] [Indexed: 08/20/2023] Open
Abstract
Poor knowledge about psychiatric disorders often results in similar diagnoses for patients with different symptoms, thus limiting the effectiveness of the available medications. As suggested by several lines of evidence, to improve these shortcomings, it is essential to identify biomarkers associated with specific symptoms and to stratify patients into more homogeneous populations taking a further step toward personalized medicine. Here, we aimed to associate specific behavioral phenotypes with specific molecular alterations by employing an animal model based on the pharmacological manipulation of the serotonergic system, which mimics a condition of vulnerability to develop psychiatric disorders. In particular, we treated female and male rats with fluoxetine (FLX 15 mg/kg dissolved in drinking water) during prenatal or early postnatal life, and we evaluated different pathological-like phenotypes (cognitive deficit, anhedonia, and anxiety) by exposing the rats to a battery of behavioral tests during adolescence and adulthood. In addition, we carried out molecular analyses on specific brain areas and in the blood. Our results showed that perinatal FLX administration determined age- and sex-dependent effects, with males being more sensitive to prenatal manipulation and manifesting anhedonic-like behavior and females to early postnatal exposure, exhibiting cognitive deficits and a less anxious phenotype. Furthermore, we identified, peripherally and centrally, biological functions altered by perinatal serotonin modulation regardless of the timing of exposure and sex, and other pathways specific for the pathological-like phenotypes. The results presented here provide new insights into potential biomarkers associated with specific behavioral phenotypes that may be useful for broadening knowledge about psychiatric conditions.
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Affiliation(s)
- Maria Teresa Gallo
- Department of Pharmacological and Biomolecular Sciences "Rodolfo Paoletti", Università Degli Studi di Milano, Milan, Italy
| | - Paola Brivio
- Department of Pharmacological and Biomolecular Sciences "Rodolfo Paoletti", Università Degli Studi di Milano, Milan, Italy.
| | - Beatrice Dolci
- Department of Pharmacological and Biomolecular Sciences "Rodolfo Paoletti", Università Degli Studi di Milano, Milan, Italy
| | - Fabio Fumagalli
- Department of Pharmacological and Biomolecular Sciences "Rodolfo Paoletti", Università Degli Studi di Milano, Milan, Italy
| | - Francesca Calabrese
- Department of Pharmacological and Biomolecular Sciences "Rodolfo Paoletti", Università Degli Studi di Milano, Milan, Italy
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2
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Bezenah JC, Tejada AN, Garcia DA, Lopez K, Richie JA, Amodeo DA, Amodeo LR. Early prenatal and late prenatal escitalopram exposure differentially impacts behavioral flexibility and anxiety-related behaviors in adulthood. Pharmacol Biochem Behav 2023; 224:173534. [PMID: 36889444 DOI: 10.1016/j.pbb.2023.173534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Revised: 02/24/2023] [Accepted: 03/01/2023] [Indexed: 03/08/2023]
Abstract
Selective serotonin reuptake inhibitors (SSRIs) are medications commonly used by pregnant women. While SSRIs have been considered safe during pregnancy, there is limited understanding of the long-term consequences of prenatal SSRI exposure on adult behavioral processes. Recent human studies have demonstrated prenatal exposure to some SSRIs in humans may increase susceptibility to autism spectrum disorder (ASD) and developmental delays. While escitalopram is one of the most effective antidepressants, it is also one of the newer available SSRIs, resulting in less information on its safety profile during pregnancy. The current study administered escitalopram (0 or 10 mg/kg, s.c.) to nulliparous female Long-Evans rats for the first (G1-10) or last half (G11-20) of the gestational period. Young adult male and female offspring were subsequently tested on a battery of behavioral tasks consisting of probabilistic reversal learning task, open field conflict, marble burying and social approach tasks. Results demonstrate that escitalopram exposure during the first half of pregnancy resulted in reduced anxiety-like behavior (disinhibition) on the modified open field and enhanced flexibility on the probabilistic reversal learning task. Exposure to escitalopram later in pregnancy resulted in an increase in marble burying behavior, but no differences were found with the other measures. These results suggest that exposure to escitalopram during the first half of prenatal development can have long lasting changes on adult behavior demonstrating better behavioral flexibility and lower anxiety-like behavior compared to non-exposed controls.
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Affiliation(s)
- Jessica C Bezenah
- Department of Psychology, California State University San Bernardino, San Bernardino, CA 92407, United States of America
| | - Alexandra N Tejada
- Department of Psychology, California State University San Bernardino, San Bernardino, CA 92407, United States of America
| | - Dominic A Garcia
- Department of Psychology, California State University San Bernardino, San Bernardino, CA 92407, United States of America
| | - Korina Lopez
- Department of Psychology, California State University San Bernardino, San Bernardino, CA 92407, United States of America
| | - Johnna A Richie
- Department of Psychology, California State University San Bernardino, San Bernardino, CA 92407, United States of America
| | - Dionisio A Amodeo
- Department of Psychology, California State University San Bernardino, San Bernardino, CA 92407, United States of America
| | - Leslie R Amodeo
- Department of Psychology, California State University San Bernardino, San Bernardino, CA 92407, United States of America.
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3
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Linhares SSG, Meurer YDSR, de Aquino ACQ, Câmara DDA, Brandão LEM, Fiuza FP, Lima RH, Engelberth RCJG, Cavalcante JS. Prenatal exposure to fluoxetine modulates emotionality and aversive memory in male and female rat offspring. Behav Pharmacol 2022; 33:575-588. [PMID: 36256730 DOI: 10.1097/fbp.0000000000000705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
During pregnancy, women are prone to depression, for which selective serotonin reuptake inhibitors (SSRIs), such as fluoxetine, are usually the first-line treatment. However, fluoxetine can cross the placental barrier and affect fetuses, causing changes in serotonin levels early in life. Long-term effects in the brain circuits that control cognitive and emotional behavior are related to early fluoxetine exposure during development. In this study, we aimed to investigate whether fluoxetine exposure (10 mg/kg/day) from the 13th gestational day (GD13) to GD21 may lead to behavioral emotional-cognitive changes in male and female rat offspring approximately 90 days postnatally (~PN90). We have analyzed the performance of individuals in the open field and in the plus-maze discriminative avoidance task, which assesses anxiety and learning/memory processing behaviors. We have found that prenatal (GD13-GD21) exposure to fluoxetine strengthened aversive memory and induced higher anxiety levels in males, and quick extinction of aversive memory in females. Taken together, these results suggest that early exposure to fluoxetine impairs the basal state of anxiety and the cognitive functions of rats during adulthood, which may be in a sex-specific manner because males appear more susceptible than females.
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Affiliation(s)
- Sarah Sophia G Linhares
- Laboratory of Neurochemical Studies, Department of Physiology, Bioscience Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Ywlliane da Silva R Meurer
- Laboratory of Neurochemical Studies, Department of Physiology, Bioscience Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Antônio Carlos Queiroz de Aquino
- Laboratory of Neurochemical Studies, Department of Physiology, Bioscience Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Diego de Aquino Câmara
- Laboratory of Neurochemical Studies, Department of Physiology, Bioscience Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | | | - Felipe Porto Fiuza
- Graduate Program in Neuroengineering, Edmond and Lily Safra International Institute of Neuroscience, Santos Dumont Institute, Macaíba, Brazil
| | - Ramón Hypolito Lima
- Graduate Program in Neuroengineering, Edmond and Lily Safra International Institute of Neuroscience, Santos Dumont Institute, Macaíba, Brazil
| | - Rovena Clara J G Engelberth
- Laboratory of Neurochemical Studies, Department of Physiology, Bioscience Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Jeferson Souza Cavalcante
- Laboratory of Neurochemical Studies, Department of Physiology, Bioscience Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
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Ramsteijn AS, Verkaik-Schakel RN, Houwing DJ, Plösch T, Olivier JDA. Perinatal exposure to fluoxetine and maternal adversity affect myelin-related gene expression and epigenetic regulation in the corticolimbic circuit of juvenile rats. Neuropsychopharmacology 2022; 47:1620-1632. [PMID: 35102259 PMCID: PMC9283398 DOI: 10.1038/s41386-022-01270-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 12/11/2021] [Accepted: 01/04/2022] [Indexed: 12/30/2022]
Abstract
Many pregnant women experience symptoms of depression, and are often treated with selective serotonin reuptake inhibitor (SSRI) antidepressants, such as fluoxetine. In utero exposure to SSRIs and maternal depressive symptoms is associated with sex-specific effects on the brain and behavior. However, knowledge about the neurobiological mechanisms underlying these sex differences is limited. In addition, most animal research into developmental SSRI exposure neglects the influence of maternal adversity. Therefore, we used a rat model relevant to depression to investigate the molecular effects of perinatal fluoxetine exposure in male and female juvenile offspring. We performed RNA sequencing and targeted DNA methylation analyses on the prefrontal cortex and basolateral amygdala; key regions of the corticolimbic circuit. Perinatal fluoxetine enhanced myelin-related gene expression in the prefrontal cortex, while inhibiting it in the basolateral amygdala. SSRI exposure and maternal adversity interacted to affect expression of genes such as myelin-associated glycoprotein (Mag) and myelin basic protein (Mbp). We speculate that altered myelination reflects altered brain maturation. In addition, these effects are stronger in males than in females, resembling known behavioral outcomes. Finally, Mag and Mbp expression correlated with DNA methylation, highlighting epigenetic regulation as a potential mechanism for developmental fluoxetine-induced changes in myelination.
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Affiliation(s)
- Anouschka S. Ramsteijn
- grid.4830.f0000 0004 0407 1981Department of Neurobiology, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands ,grid.7107.10000 0004 1936 7291Present Address: Rowett Institute of Nutrition and Health, University of Aberdeen, Aberdeen, UK
| | - Rikst Nynke Verkaik-Schakel
- grid.4830.f0000 0004 0407 1981Department of Obstetrics and Gynecology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Danielle J. Houwing
- grid.4830.f0000 0004 0407 1981Department of Neurobiology, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands ,grid.10417.330000 0004 0444 9382Present Address: Department of Cognitive Neuroscience, Center for Medical Neuroscience, Donders Institute for Brain, Cognition, and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Torsten Plösch
- grid.4830.f0000 0004 0407 1981Department of Obstetrics and Gynecology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Jocelien D. A. Olivier
- grid.4830.f0000 0004 0407 1981Department of Neurobiology, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
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Vaudin P, Augé C, Just N, Mhaouty-Kodja S, Mortaud S, Pillon D. When pharmaceutical drugs become environmental pollutants: Potential neural effects and underlying mechanisms. ENVIRONMENTAL RESEARCH 2022; 205:112495. [PMID: 34883077 DOI: 10.1016/j.envres.2021.112495] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 11/12/2021] [Accepted: 12/01/2021] [Indexed: 06/13/2023]
Abstract
Pharmaceutical drugs have become consumer products, with a daily use for some of them. The volume of production and consumption of drugs is such that they have become environmental pollutants. Their transfer to wastewater through urine, feces or rinsing in case of skin use, associated with partial elimination by wastewater treatment plants generalize pollution in the hydrosphere, including drinking water, sediments, soils, the food chain and plants. Here, we review the potential effects of environmental exposure to three classes of pharmaceutical drugs, i.e. antibiotics, antidepressants and non-steroidal anti-inflammatory drugs, on neurodevelopment. Experimental studies analyzing their underlying modes of action including those related to endocrine disruption, and molecular mechanisms including epigenetic modifications are presented. In addition, the contribution of brain imaging to the assessment of adverse effects of these three classes of pharmaceuticals is approached.
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Affiliation(s)
- Pascal Vaudin
- Physiologie de La Reproduction et des Comportements, CNRS, IFCE, INRAE, Université de Tours, PRC, F-37380, Nouzilly, France.
| | - Corinne Augé
- UMR 1253, IBrain, University of Tours, INSERM, 37000, Tours, France
| | - Nathalie Just
- Physiologie de La Reproduction et des Comportements, CNRS, IFCE, INRAE, Université de Tours, PRC, F-37380, Nouzilly, France
| | - Sakina Mhaouty-Kodja
- Sorbonne Université, CNRS, INSERM, Neuroscience Paris Seine - Institut de Biologie Paris Seine, 75005, Paris, France
| | - Stéphane Mortaud
- Immunologie et Neurogénétique Expérimentales et Moléculaires, UMR7355, CNRS, Université D'Orléans, 45000, Orléans, France
| | - Delphine Pillon
- Physiologie de La Reproduction et des Comportements, CNRS, IFCE, INRAE, Université de Tours, PRC, F-37380, Nouzilly, France
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Baudat M, de Kort AR, van den Hove DLA, Joosten EA. Early-life exposure to selective serotonin reuptake inhibitors: Long-term effects on pain and affective comorbidities. Eur J Neurosci 2021; 55:295-317. [PMID: 34841582 PMCID: PMC9299880 DOI: 10.1111/ejn.15544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 11/16/2021] [Accepted: 11/17/2021] [Indexed: 11/30/2022]
Abstract
A growing body of evidence indicates that early‐life exposure to selective serotonin reuptake inhibitor has long‐term consequences on the offspring's pain in addition to affective disorders like anxiety disorder and major depression. Serotonin, besides its role in regulating pain and emotions, promotes neuronal network formation. The prefrontal cortex and the amygdala are two key brain regions involved in the modulation of pain and its affective comorbidities. Thus, the aim of this review is to understand how early‐life selective serotonin reuptake inhibitor exposure alters the developing prefrontal cortex and amygdala and thereby underlies the long‐term changes in pain and its affective comorbidities in later life. While there is still limited data on the effects of early‐life selective serotonin reuptake inhibitor exposure on pain, there is a substantial body of evidence on its affective comorbidities. From this perspective paper, four conclusions emerged. First, early‐life selective serotonin reuptake inhibitor exposure results in long‐term nociceptive effects, which needs to be consistently studied to clarify. Second, it results in enhanced depressive‐like behaviour and diminished exploratory behaviour in adult rodents. Third, early‐life selective serotonin reuptake inhibitor exposure alters serotonergic levels, transcription factors expression, and brain‐derived neurotrophic factor levels, resulting in hyperconnectivity within the amygdala and the prefrontal cortex. Finally, it affects antinociceptive inputs of the prefrontal cortex and the amygdala in the spinal cord. We conclude that early‐life selective serotonin reuptake inhibitor exposure affects the maturation of prefrontal cortex and amygdala circuits and thereby enhances their antinociceptive inputs in the spinal cord.
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Affiliation(s)
- Mathilde Baudat
- Department of Psychiatry and Neuropsychology, School of Mental Health and Neuroscience, Maastricht University, Maastricht, The Netherlands.,Department of Anesthesiology and Pain Management, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Anne R de Kort
- Department of Psychiatry and Neuropsychology, School of Mental Health and Neuroscience, Maastricht University, Maastricht, The Netherlands.,Department of Anesthesiology and Pain Management, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Daniel L A van den Hove
- Department of Psychiatry and Neuropsychology, School of Mental Health and Neuroscience, Maastricht University, Maastricht, The Netherlands.,Department of Psychiatry, Psychosomatics and Psychotherapy, University of Würzburg, Würzburg, Germany
| | - Elbert A Joosten
- Department of Psychiatry and Neuropsychology, School of Mental Health and Neuroscience, Maastricht University, Maastricht, The Netherlands.,Department of Anesthesiology and Pain Management, Maastricht University Medical Centre+, Maastricht, The Netherlands
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Lozano AFQ, Moura MS, Tavares BM, Kempinas WDG. Exposure of pregnant rats to stress and/or sertraline: Side effects on maternal health and neurobehavioral development of male offspring. Life Sci 2021; 285:119960. [PMID: 34536495 DOI: 10.1016/j.lfs.2021.119960] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 09/01/2021] [Accepted: 09/09/2021] [Indexed: 11/25/2022]
Abstract
AIMS Sertraline (SE) is one of the most prescribed medications for treating gestational depression, anxiety and stress. However, little is known about its effects on nervous-system development in offspring. Therefore, this study investigated the somatic, reflex and neurobehavioral development of rats exposed to SE during pregnancy, associated or not with stress. MAIN METHODS Pregnant Wistar rats were assigned to the following groups (n = 10-8 rats/group): CO - control animals administered filtered water by gavage; SE - animals administered 20 mg/kg SE by gavage; ST - animals subjected to restraining stress and administered filtered water; ST/SE - animals subjected to restraining stress and administered 20 mg/kg SE. The treatment was administered between gestational days (GD) 13 to 20. Somatic and reflex developments were investigated in the male offspring from postnatal day (PND) 1 to 21. The elevated plus maze was performed on PND 25 and 80. The open field and light/dark box test were performed on PND 90 and 100, respectively. KEY FINDINGS Body weight reduction and vaginal bleeding were observed in pregnant rats exposed to SE. The male offspring of the SE group showed delay in incisor eruption, fur development and negative geotaxis. In addition, the SE group was less exploratory (anxious personality) compared to the CO and ST groups. SIGNIFICANCE The results obtained in the present study demonstrate that sertraline not only impairs maternal health, but also, associated or not with stress, can compromise the somatic, reflex and neurobehavioral development of male rats.
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Affiliation(s)
- Ana Flávia Quiarato Lozano
- Graduate Program in General and Applied Biology, São Paulo State University (UNESP), Institute of Biosciences, Botucatu, SP, Brazil; Laboratory of Reproductive and Developmental Biology and Toxicology, Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Botucatu, SP, Brazil.
| | - Mayara Silva Moura
- Graduate Program in General and Applied Biology, São Paulo State University (UNESP), Institute of Biosciences, Botucatu, SP, Brazil; Laboratory of Reproductive and Developmental Biology and Toxicology, Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Botucatu, SP, Brazil
| | - Bruna Marques Tavares
- Laboratory of Reproductive and Developmental Biology and Toxicology, Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Botucatu, SP, Brazil
| | - Wilma De Grava Kempinas
- Laboratory of Reproductive and Developmental Biology and Toxicology, Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Botucatu, SP, Brazil
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Chen MX, Cheng S, Lei L, Zhang XF, Liu Q, Lin A, Wallis CU, Lukowicz MJ, Sham PC, Li Q, Ao LJ. The effects of maternal SSRI exposure on the serotonin system, prefrontal protein expression and behavioral development in male and female offspring rats. Neurochem Int 2021; 146:105041. [PMID: 33836218 DOI: 10.1016/j.neuint.2021.105041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 03/21/2021] [Accepted: 03/31/2021] [Indexed: 11/24/2022]
Abstract
Fluoxetine (FLX), a commonly used selective serotonin reuptake inhibitor, is often used to treat depression during pregnancy. However, prenatal exposure to FLX has been associated with a series of neuropsychiatric illnesses. The use of a rodent model can provide a clear indication as to whether prenatal exposure to SSRIs, independent of maternal psychiatric disorders or genetic syndromes, can cause long-term behavioral abnormalities in offspring. Thus, the present study aimed to explore whether prenatal FLX exposure causes long-term neurobehavioral effects, and identify the underlying mechanism between FLX and abnormal behaviors. In our study, 12/mg/kg/day of FLX or equal normal saline (NS) was administered to pregnant Sprague-Dawley (SD) rats (FLX = 30, NS = 27) on gestation day 11 till birth. We assessed the physical development and behavior of offspring, and in vivo magnetic resonance spectroscopy (MRS) was conducted to quantify biochemical alterations in the prefrontal cortex (PFC). Ex vivo measurements of brain serotonin level and a proteomic analysis were also undertaken. Our results showed that the offspring (male offspring in particular) of fluoxetine exposed mothers showed delayed physical development, increased anxiety-like behavior, and impaired social interaction. Moreover, down-regulation of 5-HT and SERT expression were identified in the PFC. We also found that prenatal FLX exposure significantly decreased NAA/tCr with 1H-MRS in the PFC of offspring. Finally, a proteomic study revealed sex-dependent differential protein expression. These findings may have translational importance suggesting that using SSRI medication alone in pregnant mothers may result in developmental delay in their offspring. Our results also help guide the choice of outcome measures in identifying of molecular and developmental mechanisms.
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Affiliation(s)
- Mo Xian Chen
- School of Rehabilitation, Kunming Medical University, Kunming, China
| | - Shu Cheng
- Department of Rehabilitation, China Resources & WISCO General Hospital, Wuhan, China
| | - Lei Lei
- Rehabilitation Medicine Department, The Affiliated Hospital of Southwest Medical University, Tai Ping Road, Luzhou, Sichuan, China
| | - Xiao Fan Zhang
- Department of Psychiatry, Tongji Hospital of Huazhong University of Science and Technology (HUST), China
| | - Qiang Liu
- Department of Surgery, The Chinese University of Hong Kong, Hong Kong, SAR, China
| | - Aijin Lin
- School of Rehabilitation, Kunming Medical University, Kunming, China
| | | | | | - Pak C Sham
- Department of Psychiatry, The University of Hong Kong, Hong Kong, SAR, China; State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong, SAR, China; Centre for Genomic Sciences, The University of Hong Kong, Hong Kong, SAR, China
| | - Qi Li
- Department of Psychiatry, The University of Hong Kong, Hong Kong, SAR, China; State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong, SAR, China.
| | - Li Juan Ao
- School of Rehabilitation, Kunming Medical University, Kunming, China.
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Glazova NY, Manchenko DM, Volodina MA, Merchieva SA, Andreeva LA, Kudrin VS, Myasoedov NF, Levitskaya NG. Semax, synthetic ACTH(4-10) analogue, attenuates behavioural and neurochemical alterations following early-life fluvoxamine exposure in white rats. Neuropeptides 2021; 86:102114. [PMID: 33418449 DOI: 10.1016/j.npep.2020.102114] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 12/20/2020] [Accepted: 12/25/2020] [Indexed: 11/17/2022]
Abstract
Selective serotonin reuptake inhibitors (SSRI) are commonly used to treat depression during pregnancy. SSRIs cross the placenta and may influence the maturation of the foetal brain. Clinical and preclinical findings suggest long-term consequences of SSRI perinatal exposure for the offspring. The mechanisms of SSRI effects on developing brain remain largely unknown and there are no directional approaches for prevention of the consequences of maternal SSRI treatment during pregnancy. The heptapeptide Semax (MEHFPGP) is a synthetic analogue of ACTH(4-10) which exerts marked nootropic and neuroprotective activities. The aim of the present study was to investigate the long-term effects of neonatal exposure to the SSRI fluvoxamine (FA) in white rats. Additionally, the study examined the potential for Semax to prevent the negative consequences of neonatal FA exposure. Rat pups received FA or vehicle injections on postnatal days 1-14, a time period equivalent to 27-40 weeks of human foetal age. After FA treatment, rats were administered with Semax or vehicle on postnatal days 15-28. During the 2nd month of life, the rats underwent behavioural testing, and monoamine levels in brain structures were measured. It was shown that neonatal FA exposure leads to the impaired emotional response to stress and novelty and delayed acquisition of food-motivated maze task in adolescent and young adult rats. Furthermore, FA exposure induced alterations in the monoamine levels in brains of 1- and 2- month-old rats. Semax administration reduced the anxiety-like behaviour, improved learning abilities and normalized the levels of brain biogenic amines impaired by the FA exposure. The results demonstrate that early-life FA exposure in rat pups produces long-term disturbances in their anxiety-related behaviour, learning abilities, and brain monoamines content. Semax exerts a favourable effect on behaviour and biogenic amine system of rats exposed to the antidepressant. Thus, peptide Semax can prevent behavioural deficits caused by altered 5-HT levels during development.
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Affiliation(s)
- Nataliya Yu Glazova
- Institute of Molecular Genetics, RAS, 2 Akademika Kurchatova square, Moscow 123182, Russia.
| | - Daria M Manchenko
- Lomonosov Moscow State University, Biological Faculty, 1-12 Leninskie gori, Moscow 119234, Russia
| | - Maria A Volodina
- Lomonosov Moscow State University, Biological Faculty, 1-12 Leninskie gori, Moscow 119234, Russia; Institute of Cognitive Neuroscience, Centre for Bioelectric Interfaces, NRU HSE, 13-4 Myasnitskaya, Moscow 109028, Russia
| | - Svetlana A Merchieva
- Lomonosov Moscow State University, Biological Faculty, 1-12 Leninskie gori, Moscow 119234, Russia
| | - Ludmila A Andreeva
- Institute of Molecular Genetics, RAS, 2 Akademika Kurchatova square, Moscow 123182, Russia
| | - Vladimir S Kudrin
- Zakusov Research Institute of Pharmacology RAMS, 8 Baltiyskaya, Moscow 125315, Russia
| | - Nikolai F Myasoedov
- Institute of Molecular Genetics, RAS, 2 Akademika Kurchatova square, Moscow 123182, Russia
| | - Natalia G Levitskaya
- Lomonosov Moscow State University, Biological Faculty, 1-12 Leninskie gori, Moscow 119234, Russia; Institute of Molecular Genetics, RAS, 2 Akademika Kurchatova square, Moscow 123182, Russia
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10
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Hutchison SM, Mâsse LC, Pawluski JL, Oberlander TF. Perinatal selective serotonin reuptake inhibitor (SSRI) and other antidepressant exposure effects on anxiety and depressive behaviors in offspring: A review of findings in humans and rodent models. Reprod Toxicol 2021; 99:80-95. [DOI: 10.1016/j.reprotox.2020.11.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 11/04/2020] [Accepted: 11/16/2020] [Indexed: 12/13/2022]
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11
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Stoczynski L, van den Hurk P. Effects of selective serotonin reuptake inhibitor sertraline on hybrid striped bass predatory behavior and brain chemistry. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2020; 226:105564. [PMID: 32683169 DOI: 10.1016/j.aquatox.2020.105564] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Revised: 06/26/2020] [Accepted: 07/05/2020] [Indexed: 05/20/2023]
Abstract
Millions of pharmaceuticals are prescribed each year. Wastewater treatment plants fail to remove all pharmaceuticals from discharge leading to detectable concentrations entering aquatic ecosystems where the compounds can encounter nontarget organisms. Selective serotonin reuptake inhibitor (SSRI) class of antidepressants interact with transporters in the brain and peripheral nervous system to change serotonin levels in the synapse. Sublethal exposure to SSRIs can impact fish feeding behaviors, which can have impacts on ecological fitness. We exposed hybrid striped bass (Morone saxatilis x Morone chrysops) to low, medium, and high concentrations of sertraline (4.5 ± 0.84 μg/L, 35.4 ± 2.18 μg/L, and 96.8 ± 6.4 μg/L) over six days with six additional recovery days. Concentrations were chosen to compare results with a mixture study previously completed in our lab. Every three days we tracked how long each bass took to consume four fathead minnows (Pimephales promelas) and conducted destructive sampling to obtain brain and plasma samples. Brain and plasma samples were analyzed for sertraline levels and we calculated whole brain serotonin levels. During the exposure period, bass showed an increased time to capture prey, but time to capture prey returned to control levels during the six-day recovery period. Sertraline was detected in brain and plasma during the duration of the experiment, though not always in a dose-dependent fashion. While we demonstrated a relationship between time to capture prey and decrease whole brain serotonin levels, the decrease in time to capture prey during the recovery period suggests the serotonin levels in the brain are not solely responsible for the outward behavioral expression observed.
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Affiliation(s)
- Lauren Stoczynski
- Department of Biological Sciences, Clemson University, Clemson South Carolina, 29634, USA.
| | - Peter van den Hurk
- Department of Biological Sciences, Clemson University, Clemson South Carolina, 29634, USA
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12
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Hanswijk SI, Spoelder M, Shan L, Verheij MMM, Muilwijk OG, Li W, Liu C, Kolk SM, Homberg JR. Gestational Factors throughout Fetal Neurodevelopment: The Serotonin Link. Int J Mol Sci 2020; 21:E5850. [PMID: 32824000 PMCID: PMC7461571 DOI: 10.3390/ijms21165850] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/24/2020] [Accepted: 08/11/2020] [Indexed: 12/21/2022] Open
Abstract
Serotonin (5-HT) is a critical player in brain development and neuropsychiatric disorders. Fetal 5-HT levels can be influenced by several gestational factors, such as maternal genotype, diet, stress, medication, and immune activation. In this review, addressing both human and animal studies, we discuss how these gestational factors affect placental and fetal brain 5-HT levels, leading to changes in brain structure and function and behavior. We conclude that gestational factors are able to interact and thereby amplify or counteract each other's impact on the fetal 5-HT-ergic system. We, therefore, argue that beyond the understanding of how single gestational factors affect 5-HT-ergic brain development and behavior in offspring, it is critical to elucidate the consequences of interacting factors. Moreover, we describe how each gestational factor is able to alter the 5-HT-ergic influence on the thalamocortical- and prefrontal-limbic circuitry and the hypothalamo-pituitary-adrenocortical-axis. These alterations have been associated with risks to develop attention deficit hyperactivity disorder, autism spectrum disorders, depression, and/or anxiety. Consequently, the manipulation of gestational factors may be used to combat pregnancy-related risks for neuropsychiatric disorders.
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Affiliation(s)
- Sabrina I. Hanswijk
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen Medical Centre, 6525 EN Nijmegen, The Netherlands; (S.I.H.); (M.S.); (M.M.M.V.); (O.G.M.)
| | - Marcia Spoelder
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen Medical Centre, 6525 EN Nijmegen, The Netherlands; (S.I.H.); (M.S.); (M.M.M.V.); (O.G.M.)
| | - Ling Shan
- Netherlands Institute for Neuroscience, an Institute of the Royal Netherlands Academy of Arts and Sciences, 1105 BA Amsterdam, The Netherlands;
| | - Michel M. M. Verheij
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen Medical Centre, 6525 EN Nijmegen, The Netherlands; (S.I.H.); (M.S.); (M.M.M.V.); (O.G.M.)
| | - Otto G. Muilwijk
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen Medical Centre, 6525 EN Nijmegen, The Netherlands; (S.I.H.); (M.S.); (M.M.M.V.); (O.G.M.)
| | - Weizhuo Li
- College of Medical Laboratory, Dalian Medical University, Dalian 116044, China; (W.L.); (C.L.)
| | - Chunqing Liu
- College of Medical Laboratory, Dalian Medical University, Dalian 116044, China; (W.L.); (C.L.)
| | - Sharon M. Kolk
- Department of Molecular Neurobiology, Donders Institute for Brain, Cognition and Behavior, Radboud University, 6525 AJ Nijmegen, The Netherlands;
| | - Judith R. Homberg
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen Medical Centre, 6525 EN Nijmegen, The Netherlands; (S.I.H.); (M.S.); (M.M.M.V.); (O.G.M.)
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13
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Perinatal selective serotonin reuptake inhibitor exposure and behavioral outcomes: A systematic review and meta-analyses of animal studies. Neurosci Biobehav Rev 2020; 114:53-69. [DOI: 10.1016/j.neubiorev.2020.04.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Revised: 03/29/2020] [Accepted: 04/09/2020] [Indexed: 12/15/2022]
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14
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Kious BM, Bakian AV. Evidence of new-onset depression among persons with migraine after discontinuing antidepressants. Psychiatry Res 2020; 288:112990. [PMID: 32353695 DOI: 10.1016/j.psychres.2020.112990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 04/05/2020] [Accepted: 04/06/2020] [Indexed: 10/24/2022]
Abstract
Antidepressants have been hypothesized to cause tardive dysphoria-the delayed development of negative emotional symptoms. We assessed the risk of tardive dysphoria in a cohort of persons with migraine taking anti-migraine antidepressants with no known diagnosis of any mood or anxiety disorder. We included all outpatient encounters in a university hospital system for migraine from January 2008 through October 2018, excluding subjects with prior psychiatric diagnoses. Kaplan-Meier survival curves and multivariable Cox proportional hazards analyses were conducted. 13,048 subjects were included; 1191 took an antidepressant; 402 discontinued an antidepressant. In multivariable analyses examining the first year after exposure, antidepressant use was not significantly associated with risk of a depression, any mood disorder (including depression, mania, and other mood disorders), or anxiety. Antidepressant discontinuation was significantly associated with increased risk of depression, but not any mood disorder or anxiety. Among persons with migraine with no known psychiatric diagnosis, antidepressants did not appear to be associated with indicators of tardive dysphoria. Antidepressant discontinuation, however, was associated with increased risk of a depression diagnosis.
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Affiliation(s)
- Brent M Kious
- Department of Psychiatry, University of Utah, Salt Lake City, Utah, United States.
| | - Amanda V Bakian
- Department of Psychiatry, University of Utah, Salt Lake City, Utah, United States
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15
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Grieb ZA, Ragan CM. The effects of perinatal SSRI exposure on anxious behavior and neurobiology in rodent and human offspring. Eur Neuropsychopharmacol 2019; 29:1169-1184. [PMID: 31427116 DOI: 10.1016/j.euroneuro.2019.07.239] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 07/10/2019] [Accepted: 07/27/2019] [Indexed: 12/22/2022]
Abstract
While the postpartum period is typically associated with increased positive affect, many women will develop a depressive- or anxiety-related disorder during this time, which can degrade the mother-infant bond and lead to detrimental consequences for the infant. Given the potential for negative consequences, effective treatments have been critical, with selective serotonin reuptake inhibitors (SSRIs) being the most commonly-prescribed pharmaceutical agents to treat postpartum depression and anxiety. However, SSRIs can readily cross the placenta and are present in breast milk, so they might, therefore, unintentionally interact with the developing fetus/infant. There is already experimental evidence that perinatal SSRI exposure has a number of long-term effects on offspring, but this review focuses on the current literature examining the timing and consequences of perinatal SSRI exposure specifically on anxiety-like behaviors in rodents and humans, with an emphasis on the anxiety-related brain regions of the amygdala and hippocampus. This review also discusses discrepancies between the rodent and human literatures and how they might inform future studies. Finally, some key factors to consider when examining the role of perinatal SSRIs on offspring anxiety will be discussed, such as the duration of SSRI exposure and the potential neuroprotective effects of SSRIs. Given the extensive prescribing of SSRIs, the potential health consequences of perinatal SSRI exposure, and the discrepancies in the literature, it will be necessary to critically examine the factors underlying offspring anxiety outcomes.
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Affiliation(s)
- Z A Grieb
- Neuroscience Institute, 880 Petit Science Center, Georgia State University, Atlanta, GA 30303, United States.
| | - C M Ragan
- Department of Psychology, Library Student Faculty Building, Room 63, Purdue University Northwest, Westville, IN 46391, United States
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16
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Tanaka M, Sato A, Kasai S, Hagino Y, Kotajima-Murakami H, Kashii H, Takamatsu Y, Nishito Y, Inagaki M, Mizuguchi M, Hall FS, Uhl GR, Murphy D, Sora I, Ikeda K. Brain hyperserotonemia causes autism-relevant social deficits in mice. Mol Autism 2018; 9:60. [PMID: 30498565 PMCID: PMC6258166 DOI: 10.1186/s13229-018-0243-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 11/08/2018] [Indexed: 12/19/2022] Open
Abstract
Background Hyperserotonemia in the brain is suspected to be an endophenotype of autism spectrum disorder (ASD). Reducing serotonin levels in the brain through modulation of serotonin transporter function may improve ASD symptoms. Methods We analyzed behavior and gene expression to unveil the causal mechanism of ASD-relevant social deficits using serotonin transporter (Sert) knockout mice. Results Social deficits were observed in both heterozygous knockout mice (HZ) and homozygous knockout mice (KO), but increases in general anxiety were only observed in KO mice. Two weeks of dietary restriction of the serotonin precursor tryptophan ameliorated both brain hyperserotonemia and ASD-relevant social deficits in Sert HZ and KO mice. The expression of rather distinct sets of genes was altered in Sert HZ and KO mice, and a substantial portion of these genes was also affected by tryptophan depletion. Tryptophan depletion in Sert HZ and KO mice was associated with alterations in the expression of genes involved in signal transduction pathways initiated by changes in extracellular serotonin or melatonin, a derivative of serotonin. Only expression of the AU015836 gene was altered in both Sert HZ and KO mice. AU015836 expression and ASD-relevant social deficits normalized after dietary tryptophan restriction. Conclusions These findings reveal a Sert gene dose-dependent effect on brain hyperserotonemia and related behavioral sequelae in ASD and a possible therapeutic target to normalize brain hyperserotonemia and ASD-relevant social deficits. Electronic supplementary material The online version of this article (10.1186/s13229-018-0243-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Miho Tanaka
- 1Department of Psychiatry and Behavioral Sciences, Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506 Japan.,2Molecular and Cellular Medicine, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan.,3Department of Developmental Disorders, National Institute of Mental Health, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Atsushi Sato
- 1Department of Psychiatry and Behavioral Sciences, Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506 Japan.,4Department of Pediatrics, The University of Tokyo Hospital, Tokyo, Japan
| | - Shinya Kasai
- 1Department of Psychiatry and Behavioral Sciences, Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506 Japan
| | - Yoko Hagino
- 1Department of Psychiatry and Behavioral Sciences, Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506 Japan
| | - Hiroko Kotajima-Murakami
- 1Department of Psychiatry and Behavioral Sciences, Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506 Japan
| | - Hirofumi Kashii
- 1Department of Psychiatry and Behavioral Sciences, Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506 Japan
| | - Yukio Takamatsu
- 1Department of Psychiatry and Behavioral Sciences, Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506 Japan
| | - Yasumasa Nishito
- 5Center for Basic Technology Research, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Masumi Inagaki
- 3Department of Developmental Disorders, National Institute of Mental Health, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Masashi Mizuguchi
- 6Department of Developmental Medical Sciences, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - F Scott Hall
- 7Department of Pharmacology and Experimental Therapeutics, College of Pharmacy and Pharmaceutical Sciences, The University of Toledo, Toledo, OH USA
| | - George R Uhl
- 8Branch of Molecular Neurobiology, National Institute on Drug Abuse, Baltimore, MD USA.,9Research Service, New Mexico VA Health Care System, Albuquerque, NM USA
| | - Dennis Murphy
- 10Laboratory of Clinical Science, National Institutes of Health, Bethesda, MD USA
| | - Ichiro Sora
- 11Department of Psychiatry, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Kazutaka Ikeda
- 1Department of Psychiatry and Behavioral Sciences, Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo, 156-8506 Japan.,2Molecular and Cellular Medicine, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
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17
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Zaidan H, Ramaswami G, Barak M, Li JB, Gaisler-Salomon I. Pre-reproductive stress and fluoxetine treatment in rats affect offspring A-to-I RNA editing, gene expression and social behavior. ENVIRONMENTAL EPIGENETICS 2018; 4:dvy021. [PMID: 30109132 PMCID: PMC6084559 DOI: 10.1093/eep/dvy021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 06/26/2018] [Accepted: 07/05/2018] [Indexed: 05/04/2023]
Abstract
Adenosine to inosine RNA editing is an epigenetic process that entails site-specific modifications in double-stranded RNA molecules, catalyzed by adenosine deaminases acting on RNA (ADARs). Using the multiplex microfluidic PCR and deep sequencing technique, we recently showed that exposing adolescent female rats to chronic unpredictable stress before reproduction affects editing in the prefrontal cortex and amygdala of their newborn offspring, particularly at the serotonin receptor 5-HT2c (encoded by Htr2c). Here, we used the same technique to determine whether post-stress, pre-reproductive maternal treatment with fluoxetine (5 mg/kg, 7 days) reverses the effects of stress on editing. We also examined the mRNA expression of ADAR enzymes in these regions, and asked whether social behavior in adult offspring would be altered by maternal exposure to stress and/or fluoxetine. Maternal treatment with fluoxetine altered Htr2c editing in offspring amygdala at birth, enhanced the expression of Htr2c mRNA and RNA editing enzymes in the prefrontal cortex, and reversed the effects of pre-reproductive stress on Htr2c editing in this region. Furthermore, maternal fluoxetine treatment enhanced differences in editing of glutamate receptors between offspring of control and stress-exposed rats, and led to enhanced social preference in adult offspring. Our findings indicate that pre-gestational fluoxetine treatment affects patterns of RNA editing and editing enzyme expression in neonatal offspring brain in a region-specific manner, in interaction with pre-reproductive stress. Overall, these findings imply that fluoxetine treatment affects serotonergic signaling in offspring brain even when treatment is discontinued before gestation, and its effects may depend upon prior exposure to stress.
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Affiliation(s)
- Hiba Zaidan
- Department of Psychology, University of Haifa, Haifa, Israel
| | - Gokul Ramaswami
- Department of Genetics, Stanford University, Stanford, CA, USA
- Program in Neurogenetics, Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Michal Barak
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel
| | - Jin B Li
- Department of Genetics, Stanford University, Stanford, CA, USA
| | - Inna Gaisler-Salomon
- Department of Psychology, University of Haifa, Haifa, Israel
- Correspondence address. Psychology Department, University of Haifa, 199 Aba Khoushy Ave, Mt. Carmel, Haifa 3498838, Israel. Tel: +972-4-8249674; Fax: +972-4-8240966; E-mail:
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