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Higa GSV, Viana FJC, Francis-Oliveira J, Cruvinel E, Franchin TS, Marcourakis T, Ulrich H, De Pasquale R. Serotonergic neuromodulation of synaptic plasticity. Neuropharmacology 2024; 257:110036. [PMID: 38876308 DOI: 10.1016/j.neuropharm.2024.110036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 05/15/2024] [Accepted: 06/11/2024] [Indexed: 06/16/2024]
Abstract
Synaptic plasticity constitutes a fundamental process in the reorganization of neural networks that underlie memory, cognition, emotional responses, and behavioral planning. At the core of this phenomenon lie Hebbian mechanisms, wherein frequent synaptic stimulation induces long-term potentiation (LTP), while less activation leads to long-term depression (LTD). The synaptic reorganization of neuronal networks is regulated by serotonin (5-HT), a neuromodulator capable of modify synaptic plasticity to appropriately respond to mental and behavioral states, such as alertness, attention, concentration, motivation, and mood. Lately, understanding the serotonergic Neuromodulation of synaptic plasticity has become imperative for unraveling its impact on cognitive, emotional, and behavioral functions. Through a comparative analysis across three main forebrain structures-the hippocampus, amygdala, and prefrontal cortex, this review discusses the actions of 5-HT on synaptic plasticity, offering insights into its role as a neuromodulator involved in emotional and cognitive functions. By distinguishing between plastic and metaplastic effects, we provide a comprehensive overview about the mechanisms of 5-HT neuromodulation of synaptic plasticity and associated functions across different brain regions.
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Affiliation(s)
- Guilherme Shigueto Vilar Higa
- Laboratório de Neurofisiologia, Departamento de Fisiologia e Biofísica, Universidade de São Paulo, Butantã, São Paulo, SP, 05508-000, Brazil; Departamento de Bioquímica, Instituto de Química (USP), Butantã, São Paulo, SP, 05508-900, Brazil
| | - Felipe José Costa Viana
- Laboratório de Neurofisiologia, Departamento de Fisiologia e Biofísica, Universidade de São Paulo, Butantã, São Paulo, SP, 05508-000, Brazil
| | - José Francis-Oliveira
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, 35233, USA
| | - Emily Cruvinel
- Laboratório de Neurofisiologia, Departamento de Fisiologia e Biofísica, Universidade de São Paulo, Butantã, São Paulo, SP, 05508-000, Brazil
| | - Thainá Soares Franchin
- Laboratório de Neurofisiologia, Departamento de Fisiologia e Biofísica, Universidade de São Paulo, Butantã, São Paulo, SP, 05508-000, Brazil
| | - Tania Marcourakis
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Butantã, São Paulo, SP, 05508-000, Brazil
| | - Henning Ulrich
- Departamento de Bioquímica, Instituto de Química (USP), Butantã, São Paulo, SP, 05508-900, Brazil
| | - Roberto De Pasquale
- Laboratório de Neurofisiologia, Departamento de Fisiologia e Biofísica, Universidade de São Paulo, Butantã, São Paulo, SP, 05508-000, Brazil.
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Sakaguchi K, Tawata S. Giftedness and atypical sexual differentiation: enhanced perceptual functioning through estrogen deficiency instead of androgen excess. Front Endocrinol (Lausanne) 2024; 15:1343759. [PMID: 38752176 PMCID: PMC11094242 DOI: 10.3389/fendo.2024.1343759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 04/15/2024] [Indexed: 05/18/2024] Open
Abstract
Syndromic autism spectrum conditions (ASC), such as Klinefelter syndrome, also manifest hypogonadism. Compared to the popular Extreme Male Brain theory, the Enhanced Perceptual Functioning model explains the connection between ASC, savant traits, and giftedness more seamlessly, and their co-emergence with atypical sexual differentiation. Overexcitability of primary sensory inputs generates a relative enhancement of local to global processing of stimuli, hindering the abstraction of communication signals, in contrast to the extraordinary local information processing skills in some individuals. Weaker inhibitory function through gamma-aminobutyric acid type A (GABAA) receptors and the atypicality of synapse formation lead to this difference, and the formation of unique neural circuits that process external information. Additionally, deficiency in monitoring inner sensory information leads to alexithymia (inability to distinguish one's own emotions), which can be caused by hypoactivity of estrogen and oxytocin in the interoceptive neural circuits, comprising the anterior insular and cingulate gyri. These areas are also part of the Salience Network, which switches between the Central Executive Network for external tasks and the Default Mode Network for self-referential mind wandering. Exploring the possibility that estrogen deficiency since early development interrupts GABA shift, causing sensory processing atypicality, it helps to evaluate the co-occurrence of ASC with attention deficit hyperactivity disorder, dyslexia, and schizophrenia based on phenotypic and physiological bases. It also provides clues for understanding the common underpinnings of these neurodevelopmental disorders and gifted populations.
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Affiliation(s)
- Kikue Sakaguchi
- Research Department, National Institution for Academic Degrees and Quality Enhancement of Higher Education (NIAD-QE), Kodaira-shi, Tokyo, Japan
| | - Shintaro Tawata
- Graduate School of Human Sciences, Sophia University, Chiyoda-ku, Tokyo, Japan
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Fabio MC, Servin-Bernal IJC, Degano AL, Pautassi RM. Serotonin disruption at gestation alters expression of genes associated with serotonin synthesis and reuptake at weaning. Psychopharmacology (Berl) 2022; 239:3355-3366. [PMID: 36063206 DOI: 10.1007/s00213-022-06228-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: 03/23/2022] [Accepted: 08/27/2022] [Indexed: 12/28/2022]
Abstract
RATIONALE Serotonin (5-HT) is a monoamine neuromodulator that plays a key role in the organization of the central nervous system. 5-HT alterations may be associated to the emergence of social deficits and psychiatric disorders, including anxiety, depression, and substance abuse disorders. Notably, disruption of the 5-HT system during sensitive periods of development seems to exert long-term consequences, including altered anxiety responses and problematic use of alcohol. OBJECTIVE We analyzed, in mice, the effects of transient 5-HT depletion at gestation (a developmental stage when medial prefrontal cortex (mPFC) 5-HT levels depend exclusively on placental 5-HT availability) on 5-HT central synthesis and reuptake at weaning. We also explored if 5-HT disruption at the embryonic stage influences behavioral outcomes that may serve as a proxy for autistic- or anxiety-like phenotypes. METHODS C57/BL6 male and female mice, born from dams treated with a 5-HT synthesis inhibitor (PCPA; 4-Chloro-DL-phenylalanine methyl ester hydrochloride) at gestational days (G)13.5-16.5, were subjected to a behavioral battery that assesses social preference and novelty, compulsive behavior, stereotypies, and ethanol's anti-anxiety effects, at postnatal days (P) 21-28. Afterwards, expression of the genes that encode for 5-HT synthesis (Tph2) and SERT (5-HT transporter) were analyzed in mPFC via real-time RT-PCR. Dopamine 2 receptor (D2R) expression was also analyzed via RT-PCR to further explore possible effects of PCPA on dopaminergic transmission. RESULTS Transient 5-HT disruption at G13.5-16.5 reduced Tph2 expression of both male and female mice in mPFC at P23. Notably, female mice also exhibited higher SERT expression and reduced D2R expression in mPFC. Mice derived from 5-HT depleted dams displayed heightened compulsive behavior at P21, when compared to control mice. Alcohol anti-anxiety effects at early adolescence (P28) were exhibited by mice derived from 5-HT depleted dams, but not by control counterparts. No social deficits or stereotyped behaviors were observed. CONCLUSION Transient 5-HT inhibition at gestation resulted in altered expression of genes involved in 5-HT synthesis and reuptake in mPFC at weaning, a period in which the 5-HT system is still developing. These alterations may exert lingering effects, which translate to significant compulsivity and heightened sensitivity to the anxiolytic effects of alcohol at early adolescence.
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Affiliation(s)
- M C Fabio
- Instituto de Investigaciones Médicas Mercedes y Martín Ferreyra (INIMEC-CONICET-Universidad Nacional de Córdoba), Cordoba, Argentina. .,Facultad de Psicología, Universidad Nacional de Córdoba, Cordoba, Argentina.
| | - I J C Servin-Bernal
- Instituto de Investigaciones Médicas Mercedes y Martín Ferreyra (INIMEC-CONICET-Universidad Nacional de Córdoba), Cordoba, Argentina
| | - A L Degano
- Departamento de Química Biológica Ranwel CaputtoFacultad de Ciencias Químicas, Universidad Nacional de Córdoba, Cordoba, Argentina.,Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), CONICET, Universidad Nacional de Córdoba, Cordoba, Argentina
| | - R M Pautassi
- Instituto de Investigaciones Médicas Mercedes y Martín Ferreyra (INIMEC-CONICET-Universidad Nacional de Córdoba), Cordoba, Argentina.,Facultad de Psicología, Universidad Nacional de Córdoba, Cordoba, Argentina
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Liang SC, Sun CK, Fan HY, Chung W, Tzang RF, Hung KC, Chiu HJ, Cheng YS, Yeh PY. Therapeutic effects of antidepressants for global improvement and subdomain symptoms of autism spectrum disorder: a systematic review and meta-analysis. J Psychiatry Neurosci 2022; 47:E299-E310. [PMID: 35948343 PMCID: PMC9377548 DOI: 10.1503/jpn.210191] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 03/06/2022] [Accepted: 06/23/2022] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND No established pharmacological treatment is available for the core symptoms of autism spectrum disorder (ASD). This study aimed at investigating the efficacy of antidepressants for the core and associated symptoms of ASD. METHODS We searched PubMed, Embase, ClinicalKey, Cochrane CENTRAL, ScienceDirect, Web of Science and ClinicalTrials.gov using the keywords "ASD" and "antidepressants." We searched from database inception to June 2021 for randomized controlled trials of antidepressant use in patients with ASD. We calculated pooled effect sizes based on a random-effects model. RESULTS Analysis of 16 studies with 899 participants showed improvements in restricted and repetitive behaviours (effect size = 0.27) and global symptoms (effect size = 1.0) in patients with ASD taking antidepressants versus those taking placebos (p ≤ 0.01). We found no differences between the 2 groups (p ≥ 0.36) in terms of dropout rate (odds ratio [OR] = 1.17) or rate of study discontinuation because of adverse events (OR = 1.05). We also noted improvements in irritability and hyperactivity in the antidepressant group (Hedges g = 0.33 and 0.22, respectively, both p < 0.03). Subgroup analyses showed significant effects of medication type (i.e., clomipramine was better than SSRIs) and age (antidepressants were more effective in adults than in children or adolescents) on both restricted and repetitive behaviours and global improvement (p < 0.05). Meta-regression demonstrated that better therapeutic effects were associated with lower symptom severity and older age. LIMITATIONS The small effect sizes and variations in treatment response that we found warrant further study. CONCLUSION Our results supported the effectiveness of antidepressants for global symptoms and symptom subdomains of ASD, with tolerable adverse effects. Low symptom severity and adulthood were associated with better outcomes.
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Affiliation(s)
- Shun-Chin Liang
- From the Department of Management Centre, Jianan Psychiatric Centre, Ministry Of Health and Welfare, Tainan, Taiwan (Liang); the Centre for General Education, University of Kun Shan, Tainan, Taiwan (Liang); the Department of Emergency Medicine, E-Da Hospital, Kaohsiung, Taiwan (Sun); the School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung, Taiwan (Sun); the Department of Psychiatry, Tsyr-Huey Mental Hospital, Kaohsiung Jen-Ai's Home, Taiwan (Fan, Chung, Cheng); the Department of Psychiatry, Mackay Memorial Hospital, Taipei, Taiwan (Tzang); the Department of Anesthesiology, Chi Mei Medical Centre, Tainan, Taiwan (Hung); the Taoyuan Psychiatric Centre, Ministry of Health and Welfare, Taoyuan City, Taiwan (Chiu); the Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei City, Taiwan (Chiu); the Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung City, Taiwan (Cheng); the Department of Psychology, College of Medical and Health Science, Asia University, Taichung, Taiwan (Yeh); Clinical Psychology Center, Asia University Hospital, Taichung, Taiwan (Yeh)
| | - Cheuk-Kwan Sun
- From the Department of Management Centre, Jianan Psychiatric Centre, Ministry Of Health and Welfare, Tainan, Taiwan (Liang); the Centre for General Education, University of Kun Shan, Tainan, Taiwan (Liang); the Department of Emergency Medicine, E-Da Hospital, Kaohsiung, Taiwan (Sun); the School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung, Taiwan (Sun); the Department of Psychiatry, Tsyr-Huey Mental Hospital, Kaohsiung Jen-Ai's Home, Taiwan (Fan, Chung, Cheng); the Department of Psychiatry, Mackay Memorial Hospital, Taipei, Taiwan (Tzang); the Department of Anesthesiology, Chi Mei Medical Centre, Tainan, Taiwan (Hung); the Taoyuan Psychiatric Centre, Ministry of Health and Welfare, Taoyuan City, Taiwan (Chiu); the Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei City, Taiwan (Chiu); the Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung City, Taiwan (Cheng); the Department of Psychology, College of Medical and Health Science, Asia University, Taichung, Taiwan (Yeh); Clinical Psychology Center, Asia University Hospital, Taichung, Taiwan (Yeh)
| | - Hsin-Yi Fan
- From the Department of Management Centre, Jianan Psychiatric Centre, Ministry Of Health and Welfare, Tainan, Taiwan (Liang); the Centre for General Education, University of Kun Shan, Tainan, Taiwan (Liang); the Department of Emergency Medicine, E-Da Hospital, Kaohsiung, Taiwan (Sun); the School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung, Taiwan (Sun); the Department of Psychiatry, Tsyr-Huey Mental Hospital, Kaohsiung Jen-Ai's Home, Taiwan (Fan, Chung, Cheng); the Department of Psychiatry, Mackay Memorial Hospital, Taipei, Taiwan (Tzang); the Department of Anesthesiology, Chi Mei Medical Centre, Tainan, Taiwan (Hung); the Taoyuan Psychiatric Centre, Ministry of Health and Welfare, Taoyuan City, Taiwan (Chiu); the Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei City, Taiwan (Chiu); the Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung City, Taiwan (Cheng); the Department of Psychology, College of Medical and Health Science, Asia University, Taichung, Taiwan (Yeh); Clinical Psychology Center, Asia University Hospital, Taichung, Taiwan (Yeh)
| | - Weilun Chung
- From the Department of Management Centre, Jianan Psychiatric Centre, Ministry Of Health and Welfare, Tainan, Taiwan (Liang); the Centre for General Education, University of Kun Shan, Tainan, Taiwan (Liang); the Department of Emergency Medicine, E-Da Hospital, Kaohsiung, Taiwan (Sun); the School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung, Taiwan (Sun); the Department of Psychiatry, Tsyr-Huey Mental Hospital, Kaohsiung Jen-Ai's Home, Taiwan (Fan, Chung, Cheng); the Department of Psychiatry, Mackay Memorial Hospital, Taipei, Taiwan (Tzang); the Department of Anesthesiology, Chi Mei Medical Centre, Tainan, Taiwan (Hung); the Taoyuan Psychiatric Centre, Ministry of Health and Welfare, Taoyuan City, Taiwan (Chiu); the Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei City, Taiwan (Chiu); the Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung City, Taiwan (Cheng); the Department of Psychology, College of Medical and Health Science, Asia University, Taichung, Taiwan (Yeh); Clinical Psychology Center, Asia University Hospital, Taichung, Taiwan (Yeh)
| | - Ruu-Fen Tzang
- From the Department of Management Centre, Jianan Psychiatric Centre, Ministry Of Health and Welfare, Tainan, Taiwan (Liang); the Centre for General Education, University of Kun Shan, Tainan, Taiwan (Liang); the Department of Emergency Medicine, E-Da Hospital, Kaohsiung, Taiwan (Sun); the School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung, Taiwan (Sun); the Department of Psychiatry, Tsyr-Huey Mental Hospital, Kaohsiung Jen-Ai's Home, Taiwan (Fan, Chung, Cheng); the Department of Psychiatry, Mackay Memorial Hospital, Taipei, Taiwan (Tzang); the Department of Anesthesiology, Chi Mei Medical Centre, Tainan, Taiwan (Hung); the Taoyuan Psychiatric Centre, Ministry of Health and Welfare, Taoyuan City, Taiwan (Chiu); the Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei City, Taiwan (Chiu); the Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung City, Taiwan (Cheng); the Department of Psychology, College of Medical and Health Science, Asia University, Taichung, Taiwan (Yeh); Clinical Psychology Center, Asia University Hospital, Taichung, Taiwan (Yeh)
| | - Kuo-Chuan Hung
- From the Department of Management Centre, Jianan Psychiatric Centre, Ministry Of Health and Welfare, Tainan, Taiwan (Liang); the Centre for General Education, University of Kun Shan, Tainan, Taiwan (Liang); the Department of Emergency Medicine, E-Da Hospital, Kaohsiung, Taiwan (Sun); the School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung, Taiwan (Sun); the Department of Psychiatry, Tsyr-Huey Mental Hospital, Kaohsiung Jen-Ai's Home, Taiwan (Fan, Chung, Cheng); the Department of Psychiatry, Mackay Memorial Hospital, Taipei, Taiwan (Tzang); the Department of Anesthesiology, Chi Mei Medical Centre, Tainan, Taiwan (Hung); the Taoyuan Psychiatric Centre, Ministry of Health and Welfare, Taoyuan City, Taiwan (Chiu); the Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei City, Taiwan (Chiu); the Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung City, Taiwan (Cheng); the Department of Psychology, College of Medical and Health Science, Asia University, Taichung, Taiwan (Yeh); Clinical Psychology Center, Asia University Hospital, Taichung, Taiwan (Yeh)
| | - Hsien-Jane Chiu
- From the Department of Management Centre, Jianan Psychiatric Centre, Ministry Of Health and Welfare, Tainan, Taiwan (Liang); the Centre for General Education, University of Kun Shan, Tainan, Taiwan (Liang); the Department of Emergency Medicine, E-Da Hospital, Kaohsiung, Taiwan (Sun); the School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung, Taiwan (Sun); the Department of Psychiatry, Tsyr-Huey Mental Hospital, Kaohsiung Jen-Ai's Home, Taiwan (Fan, Chung, Cheng); the Department of Psychiatry, Mackay Memorial Hospital, Taipei, Taiwan (Tzang); the Department of Anesthesiology, Chi Mei Medical Centre, Tainan, Taiwan (Hung); the Taoyuan Psychiatric Centre, Ministry of Health and Welfare, Taoyuan City, Taiwan (Chiu); the Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei City, Taiwan (Chiu); the Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung City, Taiwan (Cheng); the Department of Psychology, College of Medical and Health Science, Asia University, Taichung, Taiwan (Yeh); Clinical Psychology Center, Asia University Hospital, Taichung, Taiwan (Yeh)
| | - Yu-Shian Cheng
- From the Department of Management Centre, Jianan Psychiatric Centre, Ministry Of Health and Welfare, Tainan, Taiwan (Liang); the Centre for General Education, University of Kun Shan, Tainan, Taiwan (Liang); the Department of Emergency Medicine, E-Da Hospital, Kaohsiung, Taiwan (Sun); the School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung, Taiwan (Sun); the Department of Psychiatry, Tsyr-Huey Mental Hospital, Kaohsiung Jen-Ai's Home, Taiwan (Fan, Chung, Cheng); the Department of Psychiatry, Mackay Memorial Hospital, Taipei, Taiwan (Tzang); the Department of Anesthesiology, Chi Mei Medical Centre, Tainan, Taiwan (Hung); the Taoyuan Psychiatric Centre, Ministry of Health and Welfare, Taoyuan City, Taiwan (Chiu); the Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei City, Taiwan (Chiu); the Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung City, Taiwan (Cheng); the Department of Psychology, College of Medical and Health Science, Asia University, Taichung, Taiwan (Yeh); Clinical Psychology Center, Asia University Hospital, Taichung, Taiwan (Yeh)
| | - Pin-Yang Yeh
- From the Department of Management Centre, Jianan Psychiatric Centre, Ministry Of Health and Welfare, Tainan, Taiwan (Liang); the Centre for General Education, University of Kun Shan, Tainan, Taiwan (Liang); the Department of Emergency Medicine, E-Da Hospital, Kaohsiung, Taiwan (Sun); the School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung, Taiwan (Sun); the Department of Psychiatry, Tsyr-Huey Mental Hospital, Kaohsiung Jen-Ai's Home, Taiwan (Fan, Chung, Cheng); the Department of Psychiatry, Mackay Memorial Hospital, Taipei, Taiwan (Tzang); the Department of Anesthesiology, Chi Mei Medical Centre, Tainan, Taiwan (Hung); the Taoyuan Psychiatric Centre, Ministry of Health and Welfare, Taoyuan City, Taiwan (Chiu); the Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei City, Taiwan (Chiu); the Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung City, Taiwan (Cheng); the Department of Psychology, College of Medical and Health Science, Asia University, Taichung, Taiwan (Yeh); Clinical Psychology Center, Asia University Hospital, Taichung, Taiwan (Yeh)
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Siafis S, Çıray O, Wu H, Schneider-Thoma J, Bighelli I, Krause M, Rodolico A, Ceraso A, Deste G, Huhn M, Fraguas D, San José Cáceres A, Mavridis D, Charman T, Murphy DG, Parellada M, Arango C, Leucht S. Pharmacological and dietary-supplement treatments for autism spectrum disorder: a systematic review and network meta-analysis. Mol Autism 2022; 13:10. [PMID: 35246237 PMCID: PMC8896153 DOI: 10.1186/s13229-022-00488-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 02/02/2022] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND There is still no approved medication for the core symptoms of autism spectrum disorder (ASD). This network meta-analysis investigated pharmacological and dietary-supplement treatments for ASD. METHODS We searched for randomized-controlled-trials (RCTs) with a minimum duration of seven days in ClinicalTrials.gov, EMBASE, MEDLINE, PsycINFO, WHO-ICTRP (from inception up to July 8, 2018), CENTRAL and PubMed (up to November 3, 2021). The co-primary outcomes were core symptoms (social-communication difficulties-SCD, repetitive behaviors-RB, overall core symptoms-OCS) measured by validated scales and standardized-mean-differences (SMDs). Associated symptoms, e.g., irritability/aggression and attention-deficit/hyperactivity disorder (ADHD) symptoms, dropouts and important side-effects, were investigated as secondary outcomes. Studies in children/adolescents and adults were analyzed separately in random-effects pairwise and network meta-analyses. RESULTS We analyzed data for 41 drugs and 17 dietary-supplements, from 125 RCTs (n = 7450 participants) in children/adolescents and 18 RCTs (n = 1104) in adults. The following medications could improve at least one core symptom domain in comparison with placebo: aripiprazole (k = 6 studies in analysis, SCD: SMD = 0.27 95% CI [0.09, 0.44], RB: 0.48 [0.26, 0.70]), atomoxetine (k = 3, RB:0.49 [0.18, 0.80]), bumetanide (k = 4, RB: 0.35 [0.09, 0.62], OCS: 0.61 [0.31, 0.91]), and risperidone (k = 4, SCM: 0.31 [0.06, 0.55], RB: 0.60 [0.29, 0.90]; k = 3, OCS: 1.18 [0.75, 1.61]) in children/adolescents; fluoxetine (k = 1, RB: 1.20 [0.45, 1.96]), fluvoxamine (k = 1, RB: 1.04 [0.27, 1.81]), oxytocin (k = 6, RB:0.41 [0.16, 0.66]) and risperidone (k = 1, RB: 0.97 [0.21,1.74]) in adults. There were some indications of improvement by carnosine, haloperidol, folinic acid, guanfacine, omega-3-fatty-acids, probiotics, sulforaphane, tideglusib and valproate, yet imprecise and not robust. Confidence in these estimates was very low or low, except moderate for oxytocin. Medications differed substantially in improving associated symptoms, and in their side-effect profiles. LIMITATIONS Most of the studies were inadequately powered (sample sizes of 20-80 participants), with short duration (8-13 weeks), and about a third focused on associated symptoms. Networks were mainly star-shaped, and there were indications of reporting bias. There was no optimal rating scale measuring change in core symptoms. CONCLUSIONS Some medications could improve core symptoms, although this could be likely secondary to the improvement of associated symptoms. Evidence on their efficacy and safety is preliminary; therefore, routine prescription of medications for the core symptoms cannot be recommended. Trial registration PROSPERO-ID CRD42019125317.
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Affiliation(s)
- Spyridon Siafis
- Department of Psychiatry and Psychotherapy, School of Medicine, Technical University of Munich, Ismaningerstr. 22, 81675, Munich, Germany.
| | - Oğulcan Çıray
- Department of Child and Adolescent Psychiatry, Mardin State Hospital, Artuklu, Mardin, Turkey
| | - Hui Wu
- Department of Psychiatry and Psychotherapy, School of Medicine, Technical University of Munich, Ismaningerstr. 22, 81675, Munich, Germany
| | - Johannes Schneider-Thoma
- Department of Psychiatry and Psychotherapy, School of Medicine, Technical University of Munich, Ismaningerstr. 22, 81675, Munich, Germany
| | - Irene Bighelli
- Department of Psychiatry and Psychotherapy, School of Medicine, Technical University of Munich, Ismaningerstr. 22, 81675, Munich, Germany
| | - Marc Krause
- Department of Psychiatry and Psychotherapy, School of Medicine, Technical University of Munich, Munich, Germany
| | - Alessandro Rodolico
- Department of Experimental and Clinical Medicine, Psychiatric Clinic University Hospital 'Gaspare Rodolico', University of Catania, Catania, Italy
| | - Anna Ceraso
- Department of Psychiatry, Spedali Civili Hospital, Brescia, Italy
| | - Giacomo Deste
- Department of Psychiatry, Spedali Civili Hospital, Brescia, Italy
| | - Maximilian Huhn
- Department of Psychiatry and Psychotherapy, School of Medicine, Technical University of Munich, Ismaningerstr. 22, 81675, Munich, Germany
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, Social Foundation Bamberg, Teaching Hospital of the University of Erlangen, Bamberg, Germany
| | - David Fraguas
- Institute of Psychiatry and Mental Health, Hospital Clínico San Carlos, IdISSC CIBERSAM, School of Medicine, Universidad Complutense, Madrid, Spain
| | - Antonia San José Cáceres
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
- Centro Investigación Biomédica en Red Salud Mental (CIBERSAM), Madrid, Spain
| | - Dimitris Mavridis
- Department of Primary Education, University of Ioannina, Ioannina, Greece
- Faculté de Médecine, Université Paris Descartes, Paris, France
| | - Tony Charman
- Department of Psychology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Declan G Murphy
- Department of Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Mara Parellada
- Department of Child and Adolescent Psychiatry, Institute of Psychiatry and Mental Health, Hospital General Universitario Gregorio Marañón, Madrid, Spain
- School of Medicine, Universidad Complutense, Madrid, Spain
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
- Centro Investigación Biomédica en Red Salud Mental (CIBERSAM), Madrid, Spain
| | - Celso Arango
- Department of Child and Adolescent Psychiatry, Institute of Psychiatry and Mental Health, Hospital General Universitario Gregorio Marañón, Madrid, Spain
- School of Medicine, Universidad Complutense, Madrid, Spain
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
- Centro Investigación Biomédica en Red Salud Mental (CIBERSAM), Madrid, Spain
| | - Stefan Leucht
- Department of Psychiatry and Psychotherapy, School of Medicine, Technical University of Munich, Ismaningerstr. 22, 81675, Munich, Germany
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Kuo HY, Liu FC. Pathophysiological Studies of Monoaminergic Neurotransmission Systems in Valproic Acid-Induced Model of Autism Spectrum Disorder. Biomedicines 2022; 10:560. [PMID: 35327362 PMCID: PMC8945169 DOI: 10.3390/biomedicines10030560] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 02/21/2022] [Accepted: 02/22/2022] [Indexed: 01/27/2023] Open
Abstract
Autism spectrum disorder (ASD) is a neurodevelopmental disorder with complex etiology. The core syndromes of ASD are deficits in social communication and self-restricted interests and repetitive behaviors. Social communication relies on the proper integration of sensory and motor functions, which is tightly interwoven with the limbic function of reward, motivation, and emotion in the brain. Monoamine neurotransmitters, including serotonin, dopamine, and norepinephrine, are key players in the modulation of neuronal activity. Owing to their broad distribution, the monoamine neurotransmitter systems are well suited to modulate social communication by coordinating sensory, motor, and limbic systems in different brain regions. The complex and diverse functions of monoamine neurotransmission thus render themselves as primary targets of pathophysiological investigation of the etiology of ASD. Clinical studies have reported that children with maternal exposure to valproic acid (VPA) have an increased risk of developing ASD. Extensive animal studies have confirmed that maternal treatments of VPA include ASD-like phenotypes, including impaired social communication and repetitive behavior. Here, given that ASD is a neurodevelopmental disorder, we begin with an overview of the neural development of monoaminergic systems with their neurochemical properties in the brain. We then review and discuss the evidence of human clinical and animal model studies of ASD with a focus on the VPA-induced pathophysiology of monoamine neurotransmitter systems. We also review the potential interactions of microbiota and monoamine neurotransmitter systems in ASD pathophysiology. Widespread and complex changes in monoamine neurotransmitters are detected in the brains of human patients with ASD and validated in animal models. ASD animal models are not only essential to the characterization of pathogenic mechanisms, but also provide a preclinical platform for developing therapeutic approaches to ASD.
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Affiliation(s)
- Hsiao-Ying Kuo
- Institute of Anatomy and Cell Biology, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan
| | - Fu-Chin Liu
- Institute of Neuroscience, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan
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7
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Markopoulos A, Inserra A, De Gregorio D, Gobbi G. Evaluating the Potential Use of Serotonergic Psychedelics in Autism Spectrum Disorder. Front Pharmacol 2022; 12:749068. [PMID: 35177979 PMCID: PMC8846292 DOI: 10.3389/fphar.2021.749068] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 11/04/2021] [Indexed: 01/29/2023] Open
Abstract
Recent clinical and preclinical evidence points towards empathogenic and prosocial effects elicited by psychedelic compounds, notably the serotonin 5-HT2A agonists lysergic acid diethylamide (LSD), psilocybin, N,N-Dimethyltryptamine (DMT), and their derivatives. These findings suggest a therapeutic potential of psychedelic compounds for some of the behavioural traits associated with autism spectrum disorder (ASD), a neurodevelopmental condition characterized by atypical social behaviour. In this review, we highlight evidence suggesting that psychedelics may potentially ameliorate some of the behavioural atypicalities of ASD, including reduced social behaviour and highly co-occurring anxiety and depression. Next, we discuss dysregulated neurobiological systems in ASD and how they may underlie or potentially limit the therapeutic effects of psychedelics. These phenomena include: 1) synaptic function, 2) serotonergic signaling, 3) prefrontal cortex activity, and 4) thalamocortical signaling. Lastly, we discuss clinical studies from the 1960s and 70s that assessed the use of psychedelics in the treatment of children with ASD. We highlight the positive behavioural outcomes of these studies, including enhanced mood and social behaviour, as well as the adverse effects of these trials, including increases in aggressive behaviour and dissociative and psychotic states. Despite preliminary evidence, further studies are needed to determine whether the benefits of psychedelic treatment in ASD outweigh the risks associated with the use of these compounds in this population, and if the 5-HT2A receptor may represent a target for social-behavioural disorders.
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Affiliation(s)
- Athanasios Markopoulos
- Neurobiological Psychiatry Unit, Department of Psychiatry, McGill University, Montreal, QC, Canada
| | - Antonio Inserra
- Neurobiological Psychiatry Unit, Department of Psychiatry, McGill University, Montreal, QC, Canada
| | - Danilo De Gregorio
- Neurobiological Psychiatry Unit, Department of Psychiatry, McGill University, Montreal, QC, Canada
| | - Gabriella Gobbi
- Neurobiological Psychiatry Unit, Department of Psychiatry, McGill University, Montreal, QC, Canada.,McGill University Health Centre, McGill University, Montreal, QC, Canada
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8
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Zieminska E, Ruszczynska A, Augustyniak J, Toczylowska B, Lazarewicz JW. Zinc and Copper Brain Levels and Expression of Neurotransmitter Receptors in Two Rat ASD Models. Front Mol Neurosci 2021; 14:656740. [PMID: 34267627 PMCID: PMC8277171 DOI: 10.3389/fnmol.2021.656740] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 06/01/2021] [Indexed: 12/19/2022] Open
Abstract
Zinc and copper are important trace elements necessary for the proper functioning of neurons. Impaired zinc and/or copper metabolism and signaling are implicated in many brain diseases, including autism (ASD). In our studies, autistic-like behavior in rat offsprings was induced by application to pregnant mothers valproic acid or thalidomide. Zinc and copper contents were measured in serum and brain structures: hippocampus, cerebral cortex, and cerebellum. Our research shows no interconnections in the particular metal concentrations measured in autistic animal brains and their sera. Based on patient researches, we studied 26 genes belonging to disturbed neurotransmitter pathways. In the same brain regions, we examined the expression of genes encoding proteins of cholinergic, adrenergic, serotonin, and dopamine receptors. In both rats’ ASD models, 17 out of the tested gene expression were decreased. In the cerebellum and cerebral cortex, expression of genes encoding cholinergic, adrenergic, and dopaminergic receptors decreased, whereas in the hippocampus only expression of serotoninergic receptors genes was downregulated. The changes in metals content observed in the rat brain can be secondary phenomena, perhaps elements of mechanisms that compensate for neurotransmission dysfunctions.
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Affiliation(s)
- Elzbieta Zieminska
- Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland
| | - Anna Ruszczynska
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Warsaw, Poland
| | - Justyna Augustyniak
- Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland
| | - Beata Toczylowska
- Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland
| | - Jerzy W Lazarewicz
- Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland
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9
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Lee J, Avramets D, Jeon B, Choo H. Modulation of Serotonin Receptors in Neurodevelopmental Disorders: Focus on 5-HT7 Receptor. Molecules 2021; 26:molecules26113348. [PMID: 34199418 PMCID: PMC8199608 DOI: 10.3390/molecules26113348] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 05/31/2021] [Accepted: 05/31/2021] [Indexed: 12/17/2022] Open
Abstract
Since neurodevelopmental disorders (NDDs) influence more than 3% of children worldwide, there has been intense investigation to understand the etiology of disorders and develop treatments. Although there are drugs such as aripiprazole, risperidone, and lurasidone, these medications are not cures for the disorders and can only help people feel better or alleviate their symptoms. Thus, it is required to discover therapeutic targets in order to find the ultimate treatments of neurodevelopmental disorders. It is suggested that abnormal neuronal morphology in the neurodevelopment process is a main cause of NDDs, in which the serotonergic system is emerging as playing a crucial role. From this point of view, we noticed the correlation between serotonin receptor subtype 7 (5-HT7R) and NDDs including autism spectrum disorder (ASD), fragile X syndrome (FXS), and Rett syndrome (RTT). 5-HT7R modulators improved altered behaviors in animal models and also affected neuronal morphology via the 5-HT7R/G12 signaling pathway. Through the investigation of recent studies, it is suggested that 5-HT7R could be a potential therapeutic target for the treatment of NDDs.
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Affiliation(s)
- Jieon Lee
- Brain Science Institute, Korea Institute of Science and Technology, Seongbuk-gu, Seoul 02792, Korea; (J.L.); (D.A.)
- Division of Bio-Medical Science & Technology, KIST School, Korea University of Science and Technology, Seoul 02792, Korea
| | - Diana Avramets
- Brain Science Institute, Korea Institute of Science and Technology, Seongbuk-gu, Seoul 02792, Korea; (J.L.); (D.A.)
- Division of Bio-Medical Science & Technology, KIST School, Korea University of Science and Technology, Seoul 02792, Korea
| | - Byungsun Jeon
- Brain Science Institute, Korea Institute of Science and Technology, Seongbuk-gu, Seoul 02792, Korea; (J.L.); (D.A.)
- Correspondence: (B.J.); (H.C.); Tel.: +82-2-958-5191 (B.J.); +82-2-958-5157 (H.C.)
| | - Hyunah Choo
- Brain Science Institute, Korea Institute of Science and Technology, Seongbuk-gu, Seoul 02792, Korea; (J.L.); (D.A.)
- Division of Bio-Medical Science & Technology, KIST School, Korea University of Science and Technology, Seoul 02792, Korea
- Correspondence: (B.J.); (H.C.); Tel.: +82-2-958-5191 (B.J.); +82-2-958-5157 (H.C.)
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10
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Andersson M, Tangen Ä, Farde L, Bölte S, Halldin C, Borg J, Lundberg J. Serotonin transporter availability in adults with autism-a positron emission tomography study. Mol Psychiatry 2021; 26:1647-1658. [PMID: 32848204 PMCID: PMC8159737 DOI: 10.1038/s41380-020-00868-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Revised: 07/30/2020] [Accepted: 08/10/2020] [Indexed: 12/11/2022]
Abstract
Impairments in social interaction and communication, in combination with restricted, repetitive behaviors and interests, define the neurodevelopmental diagnosis of autism spectrum disorder (ASD). The biological underpinnings of ASD are not well known, but the hypothesis of serotonin (5-HT) involvement in the neurodevelopment of ASD is one of the longest standing. Reuptake through the 5-HT transporter (5-HTT) is the main pathway decreasing extracellular 5-HT in the brain and a marker for the 5-HT system, but in vivo investigations of the 5-HTT and the 5-HT system in ASD are scarce and so far inconclusive. To quantify possible alterations in the 5-HT system in ASD, we used positron emission tomography and the radioligand [11C]MADAM to measure 5-HTT availability in the brain of 15 adults with ASD and 15 controls. Moreover, we examined correlations between regional 5-HTT availability and behavioral phenotype assessments regarding ASD core symptoms. In the ASD group, we found significantly lower 5-HTT availability in total gray matter, brainstem, and 9 of 18 examined subregions of gray matter. In addition, several correlations between regional 5-HTT availability and social cognitive test performance were found. The results confirm the hypothesis that 5-HTT availability is lower in the brain of adult individuals with ASD, and are consistent with the theory of 5-HT involvement in ASD neurodevelopment. The findings endorse the central role of 5-HT in the physiology of ASD, and confirm the need for a continued investigation of the 5-HT system in order to disentangle the biology of ASD.
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Affiliation(s)
- Max Andersson
- Department of Clinical Neuroscience, Center for Psychiatry Research, Karolinska Institutet and Region Stockholm, Stockholm, Sweden.
| | - Ämma Tangen
- Department of Clinical Neuroscience, Center for Psychiatry Research, Karolinska Institutet and Region Stockholm, Stockholm, Sweden
| | - Lars Farde
- Department of Clinical Neuroscience, Center for Psychiatry Research, Karolinska Institutet and Region Stockholm, Stockholm, Sweden
| | - Sven Bölte
- Department of Women's and Children's Health, Karolinska Institutet, Center of Neurodevelopmental Disorders (KIND), Center for Psychiatry Research, Stockholm Health Care Services, Region Stockholm, Stockholm, Sweden
- Child and Adolescent Psychiatry, Stockholm Health Care Services, Region Stockholm, Stockholm, Sweden
- Curtin Autism Research Group, School of Occupational Therapy, Social Work and Speech Pathology, Curtin University, Perth, WA, Australia
| | - Christer Halldin
- Department of Clinical Neuroscience, Center for Psychiatry Research, Karolinska Institutet and Region Stockholm, Stockholm, Sweden
| | - Jacqueline Borg
- Department of Clinical Neuroscience, Center for Psychiatry Research, Karolinska Institutet and Region Stockholm, Stockholm, Sweden
| | - Johan Lundberg
- Department of Clinical Neuroscience, Center for Psychiatry Research, Karolinska Institutet and Region Stockholm, Stockholm, Sweden
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Lacivita E, Niso M, Mastromarino M, Garcia Silva A, Resch C, Zeug A, Loza MI, Castro M, Ponimaskin E, Leopoldo M. Knowledge-Based Design of Long-Chain Arylpiperazine Derivatives Targeting Multiple Serotonin Receptors as Potential Candidates for Treatment of Autism Spectrum Disorder. ACS Chem Neurosci 2021; 12:1313-1327. [PMID: 33792287 DOI: 10.1021/acschemneuro.0c00647] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Autism spectrum disorder (ASD) includes a group of neurodevelopmental disorders characterized by core symptoms such as impaired social interaction and communication, repetitive and stereotyped behaviors, and restricted interests. To date, there are no effective treatments for these core symptoms. Several studies have shown that the brain serotonin (5-HT) neurotransmission system is altered in both ASD patients and animal models of the disease. Multiple pieces of evidence suggest that targeting 5-HT receptors may treat the core symptoms of ASD and associated intellectual disabilities. In fact, stimulation of the 5-HT1A receptor reduces repetitive and restricted behaviors; blockade of the 5-HT2A receptor reduces both learning deficits and repetitive behavior, and activation of the 5-HT7 receptor improves cognitive performances and reduces repetitive behavior. On such a basis, we have designed novel arylpiperazine derivatives pursuing unprecedently reported activity profiles: dual 5-HT7/5-HT1A receptor agonist properties and mixed 5-HT7 agonist/5-HT1A agonist/5-HT2A antagonist properties. Seventeen new compounds were synthesized and tested in radioligand binding assay at the target receptors. We have identified the dual 5-HT1AR/5-HT7R agonists 8c and 29 and the mixed 5-HT1AR agonist/5-HT7R agonist/5-HT2AR antagonist 20b. These compounds are metabolically stable in vitro and have suitable central nervous system druglike properties.
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Affiliation(s)
- Enza Lacivita
- Dipartimento di Farmacia−Scienze del Farmaco, Università degli Studi di Bari Aldo Moro, via Orabona, 4, 70125 Bari, Italy
| | - Mauro Niso
- Dipartimento di Farmacia−Scienze del Farmaco, Università degli Studi di Bari Aldo Moro, via Orabona, 4, 70125 Bari, Italy
| | - Margherita Mastromarino
- Dipartimento di Farmacia−Scienze del Farmaco, Università degli Studi di Bari Aldo Moro, via Orabona, 4, 70125 Bari, Italy
| | - Andrea Garcia Silva
- Center for Research in Molecular Medicine and Chronic Diseases (CIMUS). Universidade de Santiago de Compostela. Avda. de Barcelona, s/n, 15782 Santiago de Compostela, Spain
| | - Cibell Resch
- Cellular Neurophysiology, Hannover Medical School, 30625 Hannover, Germany
| | - Andre Zeug
- Cellular Neurophysiology, Hannover Medical School, 30625 Hannover, Germany
| | - María I. Loza
- Center for Research in Molecular Medicine and Chronic Diseases (CIMUS). Universidade de Santiago de Compostela. Avda. de Barcelona, s/n, 15782 Santiago de Compostela, Spain
| | - Marián Castro
- Center for Research in Molecular Medicine and Chronic Diseases (CIMUS). Universidade de Santiago de Compostela. Avda. de Barcelona, s/n, 15782 Santiago de Compostela, Spain
| | - Evgeni Ponimaskin
- Cellular Neurophysiology, Hannover Medical School, 30625 Hannover, Germany
| | - Marcello Leopoldo
- Dipartimento di Farmacia−Scienze del Farmaco, Università degli Studi di Bari Aldo Moro, via Orabona, 4, 70125 Bari, Italy
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Brandenburg C, Soghomonian JJ, Zhang K, Sulkaj I, Randolph B, Kachadoorian M, Blatt GJ. Increased Dopamine Type 2 Gene Expression in the Dorsal Striatum in Individuals With Autism Spectrum Disorder Suggests Alterations in Indirect Pathway Signaling and Circuitry. Front Cell Neurosci 2020; 14:577858. [PMID: 33240045 PMCID: PMC7681004 DOI: 10.3389/fncel.2020.577858] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 10/09/2020] [Indexed: 12/22/2022] Open
Abstract
Autism spectrum disorder (ASD) is behaviorally defined and diagnosed by delayed and/or impeded language, stereotyped repetitive behaviors, and difficulties with social interactions. Additionally, there are disruptions in motor processing, which includes the intent to execute movements, interrupted/inhibited action chain sequences, impaired execution of speech, and repetitive motor behaviors. Cortical loops through basal ganglia (BG) structures are known to play critical roles in the typical functioning of these actions. Specifically, corticostriate projections to the dorsal striatum (caudate and putamen) convey abundant input from motor, cognitive and limbic cortices and subsequently project to other BG structures. Excitatory dopamine (DA) type 1 receptors are predominantly expressed on GABAergic medium spiny neurons (MSNs) in the dorsal striatum as part of the "direct pathway" to GPi and SNpr whereas inhibitory DA type 2 receptors are predominantly expressed on MSNs that primarily project to GPe. This study aimed to better understand how this circuitry may be altered in ASD, especially concerning the neurochemical modulation of GABAergic MSNs within the two major BG pathways. We utilized two classical methods to analyze the postmortem BG in ASD in comparison to neurotypical cases: ligand binding autoradiography to quantify densities of GABA-A, GABA-B, 5-HT2, and DA type 1 and 2 receptors and in situ hybridization histochemistry (ISHH) to quantify mRNA for D1, D2 receptors and three key GABAergic subunits (α1, β2, and γ2), as well as the GABA synthesizing enzymes (GAD65/67). Results demonstrated significant increases in D2 mRNA within MSNs in both the caudate and putamen, which was further verified by proenkephalin mRNA that is co-expressed with the D2 receptor in the indirect pathway MSNs. In contrast, all other GABAergic, serotonergic and dopaminergic markers in the dorsal striatum had comparable labeling densities. These results indicate alterations in the indirect pathway of the BG, with possible implications for the execution of competing motor programs and E/I imbalance in the direct/indirect motor feedback pathways through thalamic and motor cortical areas. Results also provide insights regarding the efficacy of FDA-approved drugs used to treat individuals with ASD acting on specific DA and 5-HT receptor subtypes.
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Affiliation(s)
- Cheryl Brandenburg
- Autism Neurocircuitry Laboratory, Hussman Institute for Autism, Baltimore, MD, United States.,Program in Neuroscience, University of Maryland Baltimore School of Medicine, Baltimore, MD, United States
| | - Jean-Jacques Soghomonian
- Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, MA, United States
| | - Kunzhong Zhang
- Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, MA, United States
| | - Ina Sulkaj
- Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, MA, United States
| | - Brianna Randolph
- Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, MA, United States
| | - Marissa Kachadoorian
- Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, MA, United States
| | - Gene J Blatt
- Autism Neurocircuitry Laboratory, Hussman Institute for Autism, Baltimore, MD, United States
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