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Lee WL, Westergaard X, Hwu C, Hwu J, Fiala T, Lacefield C, Boltaev U, Mendieta AM, Lin L, Sonders MS, Brown KR, He K, Asher WB, Javitch JA, Sulzer D, Sames D. Molecular Design of SERTlight: A Fluorescent Serotonin Probe for Neuronal Labeling in the Brain. J Am Chem Soc 2024; 146:9564-9574. [PMID: 38557024 DOI: 10.1021/jacs.3c11617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
The serotonergic transmitter system plays fundamental roles in the nervous system in neurotransmission, synaptic plasticity, pathological processes, and therapeutic effects of antidepressants and psychedelics, as well as in the gastrointestinal and circulatory systems. We introduce a novel small molecule fluorescent agent, termed SERTlight, that specifically labels serotonergic neuronal cell bodies, dendrites, and axonal projections as a serotonin transporter (SERT) fluorescent substrate. SERTlight was developed by an iterative molecular design process, based on an aminoethyl-quinolone system, to integrate structural elements that impart SERT substrate activity, sufficient fluorescent brightness, and a broad absence of pharmacological activity, including at serotonin (5-hydroxytryptamine, 5HT) receptors, other G protein-coupled receptors (GPCRs), ion channels, and monoamine transporters. The high labeling selectivity is not achieved by high affinity binding to SERT itself but rather by a sufficient rate of SERT-mediated transport of SERTlight, resulting in accumulation of these molecules in 5HT neurons and yielding a robust and selective optical signal in the mammalian brain. SERTlight provides a stable signal, as it is not released via exocytosis nor by reverse SERT transport induced by 5HT releasers such as MDMA. SERTlight is optically, pharmacologically, and operationally orthogonal to a wide range of genetically encoded sensors, enabling multiplexed imaging. SERTlight enables labeling of distal 5HT axonal projections and simultaneous imaging of the release of endogenous 5HT using the GRAB5HT sensor, providing a new versatile molecular tool for the study of the serotonergic system.
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Affiliation(s)
- Wei-Li Lee
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Xavier Westergaard
- Department of Biological Sciences, Columbia University, New York, New York 10027, United States
- Department of Psychiatry, Columbia University Irving Medical Center, New York, New York 10032, United States
| | - Christopher Hwu
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Jennifer Hwu
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Tomas Fiala
- Department of Chemistry, Columbia University, New York, New York 10027, United States
- Laboratory of Organic Chemistry, ETH Zürich, D-CHAB, Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland
| | - Clay Lacefield
- Department of Psychiatry, Columbia University Irving Medical Center, New York, New York 10032, United States
- Division of Systems Neuroscience, New York State Psychiatric Institute, New York, New York 10032, United States
| | - Umed Boltaev
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Adriana M Mendieta
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Lisa Lin
- Department of Psychiatry, Columbia University Irving Medical Center, New York, New York 10032, United States
- Department of Molecular Pharmacology and Therapeutics, Columbia University Irving Medical Center, New York, New York 10032, United States
| | - Mark S Sonders
- Department of Psychiatry, Columbia University Irving Medical Center, New York, New York 10032, United States
- Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, New York 10032, United States
| | - Keaon R Brown
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Keer He
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Wesley B Asher
- Department of Psychiatry, Columbia University Irving Medical Center, New York, New York 10032, United States
- Department of Molecular Pharmacology and Therapeutics, Columbia University Irving Medical Center, New York, New York 10032, United States
| | - Jonathan A Javitch
- Department of Psychiatry, Columbia University Irving Medical Center, New York, New York 10032, United States
- Department of Molecular Pharmacology and Therapeutics, Columbia University Irving Medical Center, New York, New York 10032, United States
- Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, New York 10032, United States
| | - David Sulzer
- Department of Psychiatry, Columbia University Irving Medical Center, New York, New York 10032, United States
- Department of Neurology, Columbia University Irving Medical Center, New York, New York 10032, United States
- Department of Molecular Pharmacology and Therapeutics, Columbia University Irving Medical Center, New York, New York 10032, United States
- Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, New York 10032, United States
| | - Dalibor Sames
- Department of Chemistry, Columbia University, New York, New York 10027, United States
- Zuckerman Mind Brain Behavior Institute, Columbia University, New York, New York 10027, United States
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2
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Kisner A, Polter AM. Maturation of glutamatergic transmission onto dorsal raphe serotonergic neurons. J Neurophysiol 2024; 131:626-637. [PMID: 38380827 DOI: 10.1152/jn.00037.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 02/01/2024] [Accepted: 02/19/2024] [Indexed: 02/22/2024] Open
Abstract
Serotonergic neurons in the dorsal raphe nucleus (DRN) play important roles early in postnatal development in the maturation and modulation of higher-order emotional, sensory, and cognitive circuitry. The pivotal functions of these cells in brain development make them a critical substrate by which early experience can be wired into the brain. In this study, we investigated the maturation of synapses onto dorsal raphe serotonergic neurons in typically developing male and female mice using whole cell patch-clamp recordings in ex vivo brain slices. We show that while inhibition of these neurons is relatively stable across development, glutamatergic synapses greatly increase in strength between postnatal day 6 (P6) and P21-23. In contrast to forebrain regions, where the components making up glutamatergic synapses are dynamic across early life, we find that DRN excitatory synapses maintain a very high ratio of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) to N-methyl-d-aspartate (NMDA) receptors and a rectifying component of the AMPA response until adulthood. Overall, these findings reveal that the development of serotonergic neurons is marked by a significant refinement of glutamatergic synapses during the first three postnatal weeks. This suggests this time is a sensitive period of heightened plasticity for the integration of information from upstream brain areas. Genetic and environmental insults during this period could lead to alterations in serotonergic output, impacting both the development of forebrain circuits and lifelong neuromodulatory actions.NEW & NOTEWORTHY Serotonergic neurons are regulators of both the development of and ongoing activity in neuronal circuits controlling affective, cognitive, and sensory processing. Here, we characterize the maturation of extrinsic synaptic inputs onto these cells, showing that the first three postnatal weeks are a period of synaptic refinement and a potential window for experience-dependent plasticity in response to both enrichment and adversity.
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Affiliation(s)
- Alexandre Kisner
- Department of Pharmacology and Physiology, George Washington University School of Medicine and Health Sciences, Washington, District of Columbia, United States
| | - Abigail M Polter
- Department of Pharmacology and Physiology, George Washington University School of Medicine and Health Sciences, Washington, District of Columbia, United States
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3
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Hasegawa E, Li Y, Sakurai T. Regulation of REM sleep in mice: The role of dopamine and serotonin function in the basolateral amygdala. Neurosci Res 2024; 200:28-33. [PMID: 37696450 DOI: 10.1016/j.neures.2023.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 08/19/2023] [Accepted: 09/06/2023] [Indexed: 09/13/2023]
Abstract
Animals have a sleep cycle that involves the repetitive occurrence of non-rapid eye movement (NREM) sleep and rapid eye movement (REM) sleep. In a previous study, we discovered that a transient increase in dopamine (DA) levels in the basolateral amygdala (BLA) during NREM sleep terminates NREM sleep and initiates REM sleep by acting on Drd2-positive neurons (Hasegawa et al., 2022). In this study, we identified the neurons activated by the transient increase of DA in the BLA and found that chemogenetic excitation of these neurons increased REM sleep. Additionally, we demonstrated that acute inhibition of serotonin (5HT) in the BLA elicited a transient increase in DA in the BLA, which triggered REM sleep.
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Affiliation(s)
- Emi Hasegawa
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan; Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Yulong Li
- State Key Laboratory of Membrane Biology, Peking University School of Life Sciences, Beijing 100871, China
| | - Takeshi Sakurai
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan; Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan.
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Pan YD, Zhang Y, Zheng WY, Zhu MZ, Li HY, Ouyang WJ, Wen QQ, Zhu XH. Intermittent Hypobaric Hypoxia Ameliorates Autistic-Like Phenotypes in Mice. J Neurosci 2024; 44:e1665232023. [PMID: 38124211 PMCID: PMC10869151 DOI: 10.1523/jneurosci.1665-23.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 11/27/2023] [Accepted: 12/13/2023] [Indexed: 12/23/2023] Open
Abstract
Autism spectrum disorder (ASD) is a neurodevelopmental condition characterized by persistent deficits in social communication and stereotyped behaviors. Although major advances in basic research on autism have been achieved in the past decade, and behavioral interventions can mitigate the difficulties that individuals with autism experience, little is known about the many fundamental issues of the interventions, and no specific medication has demonstrated efficiency for the core symptoms of ASD. Intermittent hypobaric hypoxia (IHH) is characterized by repeated exposure to lowered atmospheric pressure and oxygen levels, which triggers multiple physiological adaptations in the body. Here, using two mouse models of ASD, male Shank3B -/- and Fmr1 -/y mice, we found that IHH training at an altitude of 5,000 m for 4 h per day, for 14 consecutive days, ameliorated autistic-like behaviors. Moreover, IHH training enhanced hypoxia inducible factor (HIF) 1α in the dorsal raphe nucleus (DRN) and activated the DRN serotonergic neurons. Infusion of cobalt chloride into the DRN, to mimic IHH in increasing HIF1α expression or genetically knockdown PHD2 to upregulate HIF1α expression in the DRN serotonergic neurons, alleviated autistic-like behaviors in Shank3B -/- mice. In contrast, downregulation of HIF1α in DRN serotonergic neurons induced compulsive behaviors. Furthermore, upregulating HIF1α in DRN serotonergic neurons increased the firing rates of these neurons, whereas downregulation of HIF1α in DRN serotonergic neurons decreased their firing rates. These findings suggest that IHH activated DRN serotonergic neurons via upregulation of HIF1α, and thus ameliorated autistic-like phenotypes, providing a novel therapeutic option for ASD.
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Affiliation(s)
- Yi-da Pan
- School of Basic Medical Sciences, Southern Medical University, Guangzhou 510515, China
- Research Center for Brain Health, Pazhou Lab, Guangzhou 510330, China
| | - Yuan Zhang
- School of Psychology, Shenzhen University, Shenzhen 518060, China
| | - Wen-Ying Zheng
- Research Center for Brain Health, Pazhou Lab, Guangzhou 510330, China
- School of Psychology, Shenzhen University, Shenzhen 518060, China
| | - Min-Zhen Zhu
- Research Center for Brain Health, Pazhou Lab, Guangzhou 510330, China
| | - Huan-Yu Li
- Research Center for Brain Health, Pazhou Lab, Guangzhou 510330, China
| | - Wen-Jie Ouyang
- Research Center for Brain Health, Pazhou Lab, Guangzhou 510330, China
- School of Psychology, Shenzhen University, Shenzhen 518060, China
| | - Qin-Qing Wen
- Research Center for Brain Health, Pazhou Lab, Guangzhou 510330, China
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
| | - Xin-Hong Zhu
- School of Basic Medical Sciences, Southern Medical University, Guangzhou 510515, China
- Research Center for Brain Health, Pazhou Lab, Guangzhou 510330, China
- School of Psychology, Shenzhen University, Shenzhen 518060, China
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
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5
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Ike KGO, Lamers SJC, Kaim S, de Boer SF, Buwalda B, Billeter JC, Kas MJH. The human neuropsychiatric risk gene Drd2 is necessary for social functioning across evolutionary distant species. Mol Psychiatry 2024; 29:518-528. [PMID: 38114631 PMCID: PMC11116113 DOI: 10.1038/s41380-023-02345-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 11/10/2023] [Accepted: 11/27/2023] [Indexed: 12/21/2023]
Abstract
The Drd2 gene, encoding the dopamine D2 receptor (D2R), was recently indicated as a potential target in the etiology of lowered sociability (i.e., social withdrawal), a symptom of several neuropsychiatric disorders such as Schizophrenia and Major Depression. Many animal species show social withdrawal in response to stimuli, including the vinegar fly Drosophila melanogaster and mice, which also share most human disease-related genes. Here we will test for causality between Drd2 and sociability and for its evolutionary conserved function in these two distant species, as well as assess its mechanism as a potential therapeutic target. During behavioral observations in groups of freely interacting D. melanogaster, Drd2 homologue mutant showed decreased social interactions and locomotor activity. After confirming Drd2's social effects in flies, conditional transgenic mice lacking Drd2 in dopaminergic cells (autoreceptor KO) or in serotonergic cells (heteroreceptor KO) were studied in semi-natural environments, where they could freely interact. Autoreceptor KOs showed increased sociability, but reduced activity, while no overall effect of Drd2 deletion was observed in heteroreceptor KOs. To determine acute effects of D2R signaling on sociability, we also showed that a direct intervention with the D2R agonist Sumanirole decreased sociability in wild type mice, while the antagonist showed no effects. Using a computational ethological approach, this study demonstrates that Drd2 regulates sociability across evolutionary distant species, and that activation of the mammalian D2R autoreceptor, in particular, is necessary for social functioning.
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Affiliation(s)
- Kevin G O Ike
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
| | - Sanne J C Lamers
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
| | - Soumya Kaim
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
| | - Sietse F de Boer
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
| | - Bauke Buwalda
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
| | - Jean-Christophe Billeter
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
| | - Martien J H Kas
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands.
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6
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Cramer N, Ji Y, Kane MA, Pilli NR, Castro A, Posa L, Van Patten G, Masri R, Keller A. Elevated Serotonin in Mouse Spinal Dorsal Horn Is Pronociceptive. eNeuro 2023; 10:ENEURO.0293-23.2023. [PMID: 37945351 DOI: 10.1523/eneuro.0293-23.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 10/27/2023] [Accepted: 10/31/2023] [Indexed: 11/12/2023] Open
Abstract
Serotonergic neurons in the rostral ventral medulla (RVM) contribute to bidirectional control of pain through modulation of spinal and trigeminal nociceptive networks. Deficits in this pathway are believed to contribute to pathologic pain states, but whether changes in serotonergic mechanisms are pro- or antinociceptive is debated. We used a combination of optogenetics and fiber photometry to examine these mechanisms more closely. We find that optogenetic activation of RVM serotonergic afferents in the spinal cord of naive mice produces mechanical hypersensitivity and conditioned place aversion (CPA). Neuropathic pain, produced by chronic constriction injury of the infraorbital nerve (CCI-ION), evoked a tonic increase in serotonin (5HT) concentrations within the spinal trigeminal nucleus caudalis (SpVc), measured with liquid chromatography-tandem mass spectroscopy (LC-MS/MS). By contract, CCI-ION had no effect on the phasic serotonin transients in SpVc, evoked by noxious pinch, and measured with fiber photometry of a serotonin sensor. These findings suggest that serotonin release in the spinal cord is pronociceptive and that an increase in sustained serotonin signaling, rather than phasic or event driven increases, potentiate nociception in models of chronic pain.
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Affiliation(s)
- Nathan Cramer
- Department of Neurobiology, University of Maryland School of Medicine, Baltimore, MD 21201
- University of Maryland - Medicine Institute for Neuroscience Discovery, University of Maryland School of Medicine, Baltimore, MD 21201
- Center to Advance Chronic Pain Research, University of Maryland School of Medicine, Baltimore, MD 21201
| | - Yadong Ji
- Department of Advanced Oral Sciences and Therapeutics, University of Maryland School of Dentistry, Baltimore, MD 21201
| | - Maureen A Kane
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD 21201
| | - Nageswara R Pilli
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD 21201
| | - Alberto Castro
- Department of Neurobiology, University of Maryland School of Medicine, Baltimore, MD 21201
| | - Luca Posa
- Department of Neurobiology, University of Maryland School of Medicine, Baltimore, MD 21201
| | - Gabrielle Van Patten
- Department of Neurobiology, University of Maryland School of Medicine, Baltimore, MD 21201
| | - Radi Masri
- Department of Neurobiology, University of Maryland School of Medicine, Baltimore, MD 21201
- Department of Advanced Oral Sciences and Therapeutics, University of Maryland School of Dentistry, Baltimore, MD 21201
- University of Maryland - Medicine Institute for Neuroscience Discovery, University of Maryland School of Medicine, Baltimore, MD 21201
- Center to Advance Chronic Pain Research, University of Maryland School of Medicine, Baltimore, MD 21201
| | - Asaf Keller
- Department of Neurobiology, University of Maryland School of Medicine, Baltimore, MD 21201
- University of Maryland - Medicine Institute for Neuroscience Discovery, University of Maryland School of Medicine, Baltimore, MD 21201
- Center to Advance Chronic Pain Research, University of Maryland School of Medicine, Baltimore, MD 21201
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7
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Cheng H, Lou Q, Lai N, Chen L, Zhang S, Fei F, Gao C, Wu S, Han F, Liu J, Guo Y, Chen Z, Xu C, Wang Y. Projection-defined median raphe Pet + subpopulations are diversely implicated in seizure. Neurobiol Dis 2023; 189:106358. [PMID: 37977434 DOI: 10.1016/j.nbd.2023.106358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 11/05/2023] [Accepted: 11/14/2023] [Indexed: 11/19/2023] Open
Abstract
The raphe nuclei, the primary resource of forebrain 5-HT, play an important but heterogeneous role in regulating subcortical excitabilities. Fundamental circuit organizations of different median raphe (MR) subsystems are far from completely understood. In the present study, using cell-specific viral tracing, Ca2+ fiber photometry and epilepsy model, we map out the forebrain efferent and afferent of different MR Pet+ subpopulations and their divergent roles in epilepsy. We found that PetMR neurons send both collateral and parallel innervations to different downstream regions through different subpopulations. Notably, CA3-projecting PetMR subpopulations are largely distinct from habenula (Hb)-projecting PetMR subpopulations in anatomical distribution and topological organization, while majority of the CA3-projecting PetMR subpopulations are overlapped with the medial septum (MS)-projecting PetMR subpopulations. Further, using Ca2+ fiber photometry, we monitor activities of PetMR neurons in hippocampal-kindling seizure, a classical epilepsy model with pathological mechanisms caused by excitation-inhibition imbalance. We found that soma activities of PetMR neurons are heterogeneous during different periods of generalized seizures. These divergent activities are contributed by different projection-defined PetMR subpopulations, manifesting as increased activities in CA3 but decreased activity in Hb resulting from their upstream differences. Together, our findings provide a novel framework of MR subsystems showing that projection-defined MR Pet+ subpopulations are topologically heterogenous with divergent circuit connections and are diversely implicated in seizures. This may help in the understanding of heterogeneous nature of MR 5-HTergic subsystems and the paradox roles of 5-HTergic systems in epilepsy.
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Affiliation(s)
- Heming Cheng
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Qiuwen Lou
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Nanxi Lai
- Institute of Pharmacology & Toxicology, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Liying Chen
- Department of Pharmacy, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310016, China
| | - Shuo Zhang
- Department of Pharmacy, The First Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Provincial Hospital of Chinese Medicine), Hangzhou 310003, China
| | - Fan Fei
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Chenshu Gao
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Shuangshuang Wu
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Feng Han
- Key Laboratory of Cardiovascular & Cerebrovascular Medicine, Drug Target and Drug Discovery Center, School of Pharmacy, Nanjing Medical University, Nanjing 211166, China
| | - Jinggen Liu
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China
| | - Yi Guo
- Institute of Pharmacology & Toxicology, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Zhong Chen
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China; Institute of Pharmacology & Toxicology, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Cenglin Xu
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China.
| | - Yi Wang
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China; Zhejiang Rehabilitation Medical Center, The Third Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou 310061, China.
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8
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Martianova E, Sadretdinova R, Pageau A, Pausic N, Gentiletti TD, Leblanc D, Rivera AM, Labonté B, Proulx CD. Hypothalamic neuronal outputs transmit sensorimotor signals at the onset of locomotor initiation. iScience 2023; 26:108328. [PMID: 38026162 PMCID: PMC10665817 DOI: 10.1016/j.isci.2023.108328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 09/27/2023] [Accepted: 10/20/2023] [Indexed: 12/01/2023] Open
Abstract
The lateral hypothalamus (LH) plays a critical role in sensory integration to organize behavior responses. However, how projection-defined LH neuronal outputs dynamically transmit sensorimotor signals to major downstream targets to organize behavior is unknown. Here, using multi-fiber photometry, we show that three major LH neuronal outputs projecting to the dorsal raphe nucleus (DRN), ventral tegmental area (VTA), and lateral habenula (LHb) exhibit significant coherent activity in mice engaging sensory-evoked or self-initiated motor responses. Increased activity at LH axon terminals precedes movement initiation during active coping responses and the activity of serotonin neurons and dopamine neurons. The optogenetic activation of LH axon terminals in either of the DRN, VTA, or LHb was sufficient to increase motor initiation but had different effects on passive avoidance and sucrose consumption. Our findings support the complementary role of three projection-defined LH neuronal outputs in the transmission of sensorimotor signals to major downstream regions at movement onset.
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Affiliation(s)
- Ekaterina Martianova
- CERVO Brain Research Center, Department of Psychiatry and Neurosciences, Université Laval, Québec, QC, Canada
| | - Renata Sadretdinova
- CERVO Brain Research Center, Department of Psychiatry and Neurosciences, Université Laval, Québec, QC, Canada
| | - Alicia Pageau
- CERVO Brain Research Center, Department of Psychiatry and Neurosciences, Université Laval, Québec, QC, Canada
| | - Nikola Pausic
- CERVO Brain Research Center, Department of Psychiatry and Neurosciences, Université Laval, Québec, QC, Canada
| | - Tommy Doucet Gentiletti
- CERVO Brain Research Center, Department of Psychiatry and Neurosciences, Université Laval, Québec, QC, Canada
| | - Danahé Leblanc
- CERVO Brain Research Center, Department of Psychiatry and Neurosciences, Université Laval, Québec, QC, Canada
| | - Arturo Marroquin Rivera
- CERVO Brain Research Center, Department of Psychiatry and Neurosciences, Université Laval, Québec, QC, Canada
| | - Benoît Labonté
- CERVO Brain Research Center, Department of Psychiatry and Neurosciences, Université Laval, Québec, QC, Canada
| | - Christophe D. Proulx
- CERVO Brain Research Center, Department of Psychiatry and Neurosciences, Université Laval, Québec, QC, Canada
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9
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Delestrée N, Semizoglou E, Pagiazitis JG, Vukojicic A, Drobac E, Paushkin V, Mentis GZ. Serotonergic dysfunction impairs locomotor coordination in spinal muscular atrophy. Brain 2023; 146:4574-4593. [PMID: 37678880 PMCID: PMC10629775 DOI: 10.1093/brain/awad221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 05/12/2023] [Accepted: 06/11/2023] [Indexed: 09/09/2023] Open
Abstract
Neuromodulation by serotonin regulates the activity of neuronal networks responsible for a wide variety of essential behaviours. Serotonin (or 5-HT) typically activates metabotropic G protein-coupled receptors, which in turn initiate second messenger signalling cascades and induce short and long-lasting behavioural effects. Serotonin is intricately involved in the production of locomotor activity and gait control for different motor behaviours. Although dysfunction of serotonergic neurotransmission has been associated with mood disorders and spasticity after spinal cord injury, whether and to what extent such dysregulation is implicated in movement disorders has not been firmly established. Here, we investigated whether serotonergic neuromodulation is affected in spinal muscular atrophy (SMA), a neurodegenerative disease caused by ubiquitous deficiency of the SMN protein. The hallmarks of SMA are death of spinal motor neurons, muscle atrophy and impaired motor control, both in human patients and mouse models of disease. We used a severe mouse model of SMA, that closely recapitulates the severe symptoms exhibited by type I SMA patients, the most common and most severe form of the disease. Together, with mouse genetics, optogenetics, physiology, morphology and behavioural analysis, we report severe dysfunction of serotonergic neurotransmission in the spinal cord of SMA mice, both at early and late stages of the disease. This dysfunction is followed by reduction of 5-HT synapses on vulnerable motor neurons. We demonstrate that motor neurons innervating axial and trunk musculature are preferentially affected, suggesting a possible cause for the proximo-distal progression of disease, and raising the possibility that it may underlie scoliosis in SMA patients. We also demonstrate that the 5-HT dysfunction is caused by SMN deficiency in serotonergic neurons in the raphe nuclei of the brainstem. The behavioural significance of the dysfunction in serotonergic neuromodulation is underlined by inter-limb discoordination in SMA mice, which is ameliorated when selective restoration of SMN in 5-HT neurons is achieved by genetic means. Our study uncovers an unexpected dysfunction of serotonergic neuromodulation in SMA and indicates that, if normal function is to be restored under disease conditions, 5-HT neuromodulation should be a key target for therapeutic approaches.
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Affiliation(s)
- Nicolas Delestrée
- Center for Motor Neuron Biology and Disease, Columbia University, New York, NY 10032, USA
- Department of Neurology, Columbia University, New York, NY 10032, USA
| | - Evangelia Semizoglou
- Center for Motor Neuron Biology and Disease, Columbia University, New York, NY 10032, USA
- Department of Neurology, Columbia University, New York, NY 10032, USA
| | - John G Pagiazitis
- Center for Motor Neuron Biology and Disease, Columbia University, New York, NY 10032, USA
- Department of Neurology, Columbia University, New York, NY 10032, USA
| | - Aleksandra Vukojicic
- Center for Motor Neuron Biology and Disease, Columbia University, New York, NY 10032, USA
- Department of Neurology, Columbia University, New York, NY 10032, USA
| | - Estelle Drobac
- Center for Motor Neuron Biology and Disease, Columbia University, New York, NY 10032, USA
- Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
| | - Vasilissa Paushkin
- Center for Motor Neuron Biology and Disease, Columbia University, New York, NY 10032, USA
- Department of Neurology, Columbia University, New York, NY 10032, USA
| | - George Z Mentis
- Center for Motor Neuron Biology and Disease, Columbia University, New York, NY 10032, USA
- Department of Neurology, Columbia University, New York, NY 10032, USA
- Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
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10
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Dong WY, Zhu X, Tang HD, Huang JY, Zhu MY, Cheng PK, Wang H, Wang XY, Wang H, Mao Y, Zhao W, Zhang Y, Tao WJ, Zhang Z. Brain regulation of gastric dysfunction induced by stress. Nat Metab 2023; 5:1494-1505. [PMID: 37592008 DOI: 10.1038/s42255-023-00866-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 07/18/2023] [Indexed: 08/19/2023]
Abstract
Psychological and physical stressors have been implicated in gastric disorders in humans. The mechanism coupling the brain to the stomach underlying stress-induced gastric dysfunction has remained elusive. Here, we show that the stomach directly receives acetylcholinergic inputs from the dorsal motor nucleus of the vagus (AChDMV), which are innervated by serotonergic neurons in the dorsal raphe nucleus (5-HTDRN). Microendoscopic calcium imaging and multi-tetrode electrophysiological recordings reveal that the 5-HTDRN → AChDMV → stomach circuit is inhibited with chronic stress accompanied by hypoactivate gastric function. Artificial activation of this circuit reverses the gastric dysfunction induced by chronic stress in both male and female mice. Our study demonstrates that this 5-HTDRN → AChDMV → stomach axis drives gastric dysfunction associated with stress, thus providing insights into the circuit basis for brain regulation of the stomach.
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Affiliation(s)
- Wan-Ying Dong
- Department of Anesthesiology, The First Affiliated Hospital of University of Science and Technology of China, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, People's Republic of China
| | - Xia Zhu
- Department of Anesthesiology, The First Affiliated Hospital of University of Science and Technology of China, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, People's Republic of China
| | - Hao-Di Tang
- Department of Anesthesiology, The First Affiliated Hospital of University of Science and Technology of China, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, People's Republic of China
- Laboratory of Anesthesia and Critical Care Medicine, National-Local Joint Engineering Research Center of Translational Medicine of Anesthesiology, West China Hospital, Sichuan University, Chengdu, People's Republic of China
| | - Ji-Ye Huang
- Department of Anesthesiology, The First Affiliated Hospital of University of Science and Technology of China, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, People's Republic of China
| | - Meng-Yu Zhu
- College & Hospital of Stomatology, Anhui Medical University, Key laboratory of Oral Diseases Research of Anhui Province, Hefei, People's Republic of China
- Department of Physiology, School of Basic Medical Sciences, Anhui Medical University, Hefei, People's Republic of China
| | - Ping-Kai Cheng
- Department of Anesthesiology, The First Affiliated Hospital of University of Science and Technology of China, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, People's Republic of China
| | - Hao Wang
- School of Integrated Chinese and Western Medicine, Anhui University of Chinese Medicine, Hefei, People's Republic of China
| | - Xi-Yang Wang
- School of Integrated Chinese and Western Medicine, Anhui University of Chinese Medicine, Hefei, People's Republic of China
| | - Haitao Wang
- School of Integrated Chinese and Western Medicine, Anhui University of Chinese Medicine, Hefei, People's Republic of China
| | - Yu Mao
- Department of Anesthesiology, The First Affiliated Hospital of University of Science and Technology of China, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, People's Republic of China
| | - Wan Zhao
- Department of Otolaryngology-Head and Neck Surgery, The First Affiliated Hospital of the University of Science and Technique of China, Hefei, People's Republic of China
| | - Yan Zhang
- Stroke Center and Department of Neurology, The First Affiliated Hospital of the University of Science and Technique of China, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, People's Republic of China
| | - Wen-Juan Tao
- College & Hospital of Stomatology, Anhui Medical University, Key laboratory of Oral Diseases Research of Anhui Province, Hefei, People's Republic of China.
- Department of Physiology, School of Basic Medical Sciences, Anhui Medical University, Hefei, People's Republic of China.
| | - Zhi Zhang
- Department of Anesthesiology, The First Affiliated Hospital of University of Science and Technology of China, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, People's Republic of China.
- The Center for Advanced Interdisciplinary Science and Biomedicine, Institute of Health and Medicine, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, People's Republic of China.
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11
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Benhadda A, Delhaye C, Moutkine I, Marques X, Russeau M, Le Magueresse C, Roumier A, Lévi S, Maroteaux L. 5-HT 1A and 5-HT 2B receptor interaction and co-clustering regulate serotonergic neuron excitability. iScience 2023; 26:107401. [PMID: 37575185 PMCID: PMC10415917 DOI: 10.1016/j.isci.2023.107401] [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: 04/03/2023] [Revised: 05/26/2023] [Accepted: 07/12/2023] [Indexed: 08/15/2023] Open
Abstract
Many psychiatric diseases have been associated with serotonin (5-HT) neuron dysfunction. The firing of 5-HT neurons is known to be under 5-HT1A receptor-mediated autoinhibition, but functional consequences of coexpressed receptors are unknown. Using co-immunoprecipitation, BRET, confocal, and super-resolution microscopy in hippocampal and 5-HT neurons, we present evidence that 5-HT1A and 5-HT2B receptors can form heterodimers and co-cluster at the plasma membrane of dendrites. Selective agonist stimulation of coexpressed 5-HT1A and 5-HT2B receptors prevents 5-HT1A receptor internalization and increases 5-HT2B receptor membrane clustering. Current clamp recordings of 5-HT neurons revealed that 5-HT1A receptor stimulation of acute slices from mice lacking 5-HT2B receptors in 5-HT neurons increased their firing activity trough Ca2+-activated potassium channel inhibition compared to 5-HT neurons from control mice. This work supports the hypothesis that the relative expression of 5-HT1A and 5-HT2B receptors tunes the neuronal excitability of serotonergic neurons through potassium channel regulation.
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Affiliation(s)
- Amina Benhadda
- Institut du Fer à Moulin, U1270 INSERM, Sorbonne Université, 17 rue du Fer à Moulin, 75005 Paris, France
| | - Célia Delhaye
- Institut du Fer à Moulin, U1270 INSERM, Sorbonne Université, 17 rue du Fer à Moulin, 75005 Paris, France
| | - Imane Moutkine
- Institut du Fer à Moulin, U1270 INSERM, Sorbonne Université, 17 rue du Fer à Moulin, 75005 Paris, France
| | - Xavier Marques
- Institut du Fer à Moulin, U1270 INSERM, Sorbonne Université, 17 rue du Fer à Moulin, 75005 Paris, France
| | - Marion Russeau
- Institut du Fer à Moulin, U1270 INSERM, Sorbonne Université, 17 rue du Fer à Moulin, 75005 Paris, France
| | - Corentin Le Magueresse
- Institut du Fer à Moulin, U1270 INSERM, Sorbonne Université, 17 rue du Fer à Moulin, 75005 Paris, France
| | - Anne Roumier
- Institut du Fer à Moulin, U1270 INSERM, Sorbonne Université, 17 rue du Fer à Moulin, 75005 Paris, France
| | - Sabine Lévi
- Institut du Fer à Moulin, U1270 INSERM, Sorbonne Université, 17 rue du Fer à Moulin, 75005 Paris, France
| | - Luc Maroteaux
- Institut du Fer à Moulin, U1270 INSERM, Sorbonne Université, 17 rue du Fer à Moulin, 75005 Paris, France
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12
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Cramer N, Ji Y, Kane M, Pilli N, Posa L, Patten GV, Masri R, Keller A. Elevated serotonin in mouse spinal dorsal horn is pronociceptive. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.08.10.552838. [PMID: 37645759 PMCID: PMC10461991 DOI: 10.1101/2023.08.10.552838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
Serotonergic neurons in the rostral ventral medulla (RVM) contribute to bidirectional control of pain through modulation of spinal and trigeminal nociceptive networks. Deficits in this pathway are believed to contribute to pathological pain states, but whether changes in serotonergic mechanisms are pro or anti-nociceptive are debated. We used a combination of optogenetics and fiber photometry to examine these mechanisms more closely. We find that optogenetic activation of RVM serotonergic afferents in the spinal cord of naïve mice produces mechanical hypersensitivity and conditioned place aversion. Neuropathic pain, produced by chronic constriction injury of the infraorbital nerve (CCI-ION), evoked a tonic increase in serotonin concentrations within the spinal trigeminal nucleus caudalis (SpVc), measured with liquid chromatography-tandem mass spectroscopy (LC-MS/MS). By contract, CCI-ION had no effect on the phasic serotonin transients in SpVc, evoked by noxious pinch, and measured with fiber photometry of a serotonin sensor. These findings suggest that serotonin release in the spinal cord is pronociceptive and that an increase is sustained serotonin signaling, rather than phasic or event driven increases, potentiate nociception in models of chronic pain.
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Affiliation(s)
- Nathan Cramer
- Department of Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland 21201
- UM-MIND, University of Maryland School of Medicine, Baltimore, Maryland 21201
- Center to Advance Chronic Pain Research, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - Yadong Ji
- Department of Advanced Oral Sciences and Therapeutics, University of Maryland School of Dentistry, Baltimore, Maryland 21201
| | - Maureen Kane
- Department of Pharmaceutical Sciences University of Maryland School of Pharmacy, Baltimore, Maryland 21201
| | - Nageswara Pilli
- Department of Pharmaceutical Sciences University of Maryland School of Pharmacy, Baltimore, Maryland 21201
| | - Luca Posa
- Department of Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - Gabrielle Van Patten
- Department of Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - Radi Masri
- Department of Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland 21201
- Department of Advanced Oral Sciences and Therapeutics, University of Maryland School of Dentistry, Baltimore, Maryland 21201
- UM-MIND, University of Maryland School of Medicine, Baltimore, Maryland 21201
- Center to Advance Chronic Pain Research, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - Asaf Keller
- Department of Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland 21201
- UM-MIND, University of Maryland School of Medicine, Baltimore, Maryland 21201
- Center to Advance Chronic Pain Research, University of Maryland School of Medicine, Baltimore, Maryland 21201
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13
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Morgan AA, Alves ND, Stevens GS, Yeasmin TT, Mackay A, Power S, Sargin D, Hanna C, Adib AL, Ziolkowski-Blake A, Lambe EK, Ansorge MS. Medial Prefrontal Cortex Serotonin Input Regulates Cognitive Flexibility in Mice. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.03.30.534775. [PMID: 37034804 PMCID: PMC10081203 DOI: 10.1101/2023.03.30.534775] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
The medial prefrontal cortex (mPFC) regulates cognitive flexibility and emotional behavior. Neurons that release serotonin project to the mPFC, and serotonergic drugs influence emotion and cognition. Yet, the specific roles of endogenous serotonin release in the mPFC on neurophysiology and behavior are unknown. We show that axonal serotonin release in the mPFC directly inhibits the major mPFC output neurons. In serotonergic neurons projecting from the dorsal raphe to the mPFC, we find endogenous activity signatures pre-reward retrieval and at reward retrieval during a cognitive flexibility task. In vivo optogenetic activation of this pathway during pre-reward retrieval selectively improved extradimensional rule shift performance while inhibition impaired it, demonstrating sufficiency and necessity for mPFC serotonin release in cognitive flexibility. Locomotor activity and anxiety-like behavior were not affected by either optogenetic manipulation. Collectively, our data reveal a powerful and specific modulatory role of endogenous serotonin release from dorsal raphe-to-mPFC projecting neurons in cognitive flexibility.
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14
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Reggiani JDS, Jiang Q, Barbini M, Lutas A, Liang L, Fernando J, Deng F, Wan J, Li Y, Chen C, Andermann ML. Brainstem serotonin neurons selectively gate retinal information flow to thalamus. Neuron 2023; 111:711-726.e11. [PMID: 36584680 PMCID: PMC10131437 DOI: 10.1016/j.neuron.2022.12.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 10/10/2022] [Accepted: 12/05/2022] [Indexed: 12/30/2022]
Abstract
Retinal ganglion cell (RGC) types relay parallel streams of visual feature information. We hypothesized that neuromodulators might efficiently control which visual information streams reach the cortex by selectively gating transmission from specific RGC axons in the thalamus. Using fiber photometry recordings, we found that optogenetic stimulation of serotonergic axons in primary visual thalamus of awake mice suppressed ongoing and visually evoked calcium activity and glutamate release from RGC boutons. Two-photon calcium imaging revealed that serotonin axon stimulation suppressed RGC boutons that responded strongly to global changes in luminance more than those responding only to local visual stimuli, while the converse was true for suppression induced by increases in arousal. Converging evidence suggests that differential expression of the 5-HT1B receptor on RGC presynaptic terminals, but not differential density of nearby serotonin axons, may contribute to the selective serotonergic gating of specific visual information streams before they can activate thalamocortical neurons.
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Affiliation(s)
- Jasmine D S Reggiani
- Division of Endocrinology, Diabetes and Metabolism, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA; F.M. Kirby Neurobiology Center, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA; Program in Neuroscience, Harvard Medical School, Boston, MA 02115, USA
| | - Qiufen Jiang
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Melanie Barbini
- Division of Endocrinology, Diabetes and Metabolism, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA
| | - Andrew Lutas
- Division of Endocrinology, Diabetes and Metabolism, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA
| | - Liang Liang
- Division of Endocrinology, Diabetes and Metabolism, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA; F.M. Kirby Neurobiology Center, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Jesseba Fernando
- Division of Endocrinology, Diabetes and Metabolism, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA
| | - Fei Deng
- State Key Laboratory of Membrane Biology, Peking University School of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Beijing 100871, China
| | - Jinxia Wan
- State Key Laboratory of Membrane Biology, Peking University School of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Beijing 100871, China
| | - Yulong Li
- State Key Laboratory of Membrane Biology, Peking University School of Life Sciences, PKU-IDG/McGovern Institute for Brain Research, Beijing 100871, China
| | - Chinfei Chen
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA; Program in Neuroscience, Harvard Medical School, Boston, MA 02115, USA.
| | - Mark L Andermann
- Division of Endocrinology, Diabetes and Metabolism, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA; Program in Neuroscience, Harvard Medical School, Boston, MA 02115, USA.
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15
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Wang J, Mei Y, Zhang X, Wei X, Zhang Y, Wang D, Huang J, Zhu K, Peng G, Sun B. Aberrant serotonergic signaling contributes to the hyperexcitability of CA1 pyramidal neurons in a mouse model of Alzheimer's disease. Cell Rep 2023; 42:112152. [PMID: 36821438 DOI: 10.1016/j.celrep.2023.112152] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Revised: 11/29/2022] [Accepted: 02/08/2023] [Indexed: 02/24/2023] Open
Abstract
Hyperactivity of pyramidal neurons (PNs) in CA1 is an early event in Alzheimer's disease. However, factors accounting for the hyperactivity of CA1 PNs remain to be completely investigated. In the present study, we report that the serotonergic signaling is abnormal in the hippocampus of hAPP-J20 mice. Interestingly, chemogenetic activation of serotonin (5-hydroxytryptamine; 5-HT) neurons in the median raphe nucleus (MRN) attenuates the activity of CA1 PNs in hAPP-J20 mice by regulating the intrinsic properties or inhibitory synaptic transmission of CA1 PNs through 5-HT3aR and/or 5-HT1aR. Furthermore, activating MRN 5-HT neurons improves memory in hAPP-J20 mice, and this effect is mediated by 5-HT3aR and 5-HT1aR. Direct activation of 5-HT3aR and 5-HT1aR with their selective agonists also improves the memory of hAPP-J20 mice. Together, we identify the impaired 5-HT/5-HT3aR and/or 5-HT/5-HT1aR signaling as pathways contributing to the hyperexcitability of CA1 PNs and the impaired cognition in hAPP-J20 mice.
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Affiliation(s)
- Jing Wang
- Department of Neurobiology and Department of Anesthesiology, the Children's Hospital, Zhejiang University School of Medicine and National Clinical Research Center for Child Health, Hangzhou, Zhejiang 310058, China; NHC and CAMS Key Laboratory of Medical Neurobiology, School of Brain Science and Brain Medicine, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Yufei Mei
- Department of Neurobiology and Department of Anesthesiology, the Children's Hospital, Zhejiang University School of Medicine and National Clinical Research Center for Child Health, Hangzhou, Zhejiang 310058, China; NHC and CAMS Key Laboratory of Medical Neurobiology, School of Brain Science and Brain Medicine, Zhejiang University, Hangzhou, Zhejiang 310058, China; Brain Science and Advanced Technology Institute, School of Medicine, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China.
| | - Xiaoqin Zhang
- Department of Physiology and Pharmacology, Medical School of Ningbo University, Ningbo, Zhejiang 315211, China
| | - Xiaojie Wei
- Department of Neurobiology and Department of Anesthesiology, the Children's Hospital, Zhejiang University School of Medicine and National Clinical Research Center for Child Health, Hangzhou, Zhejiang 310058, China; NHC and CAMS Key Laboratory of Medical Neurobiology, School of Brain Science and Brain Medicine, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Yiping Zhang
- Department of Neurobiology and Department of Anesthesiology, the Children's Hospital, Zhejiang University School of Medicine and National Clinical Research Center for Child Health, Hangzhou, Zhejiang 310058, China; NHC and CAMS Key Laboratory of Medical Neurobiology, School of Brain Science and Brain Medicine, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Dongpi Wang
- Department of Anesthesiology, The Children's Hospital, Zhejiang University School of Medicine and National Clinical Research Center for Child Health, Hangzhou, Zhejiang 310003, China
| | - Jinjin Huang
- Department of Anesthesiology, The Children's Hospital, Zhejiang University School of Medicine and National Clinical Research Center for Child Health, Hangzhou, Zhejiang 310003, China
| | - Keqing Zhu
- National Human Brain Bank for Health and Disease and Department of Neurology in Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, China
| | - Guoping Peng
- Department of Neurology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310003, China.
| | - Binggui Sun
- Department of Neurobiology and Department of Anesthesiology, the Children's Hospital, Zhejiang University School of Medicine and National Clinical Research Center for Child Health, Hangzhou, Zhejiang 310058, China; NHC and CAMS Key Laboratory of Medical Neurobiology, School of Brain Science and Brain Medicine, Zhejiang University, Hangzhou, Zhejiang 310058, China.
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16
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Big Data in Gastroenterology Research. Int J Mol Sci 2023; 24:ijms24032458. [PMID: 36768780 PMCID: PMC9916510 DOI: 10.3390/ijms24032458] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/18/2023] [Accepted: 01/20/2023] [Indexed: 01/28/2023] Open
Abstract
Studying individual data types in isolation provides only limited and incomplete answers to complex biological questions and particularly falls short in revealing sufficient mechanistic and kinetic details. In contrast, multi-omics approaches to studying health and disease permit the generation and integration of multiple data types on a much larger scale, offering a comprehensive picture of biological and disease processes. Gastroenterology and hepatobiliary research are particularly well-suited to such analyses, given the unique position of the luminal gastrointestinal (GI) tract at the nexus between the gut (mucosa and luminal contents), brain, immune and endocrine systems, and GI microbiome. The generation of 'big data' from multi-omic, multi-site studies can enhance investigations into the connections between these organ systems and organisms and more broadly and accurately appraise the effects of dietary, pharmacological, and other therapeutic interventions. In this review, we describe a variety of useful omics approaches and how they can be integrated to provide a holistic depiction of the human and microbial genetic and proteomic changes underlying physiological and pathophysiological phenomena. We highlight the potential pitfalls and alternatives to help avoid the common errors in study design, execution, and analysis. We focus on the application, integration, and analysis of big data in gastroenterology and hepatobiliary research.
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17
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Cheung A, Konno K, Imamura Y, Matsui A, Abe M, Sakimura K, Sasaoka T, Uemura T, Watanabe M, Futai K. Neurexins in serotonergic neurons regulate neuronal survival, serotonin transmission, and complex mouse behaviors. eLife 2023; 12:85058. [PMID: 36695811 PMCID: PMC9876567 DOI: 10.7554/elife.85058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 01/13/2023] [Indexed: 01/26/2023] Open
Abstract
Extensive serotonin (5-hydroxytryptamine, 5-HT) innervation throughout the brain corroborates 5-HT's modulatory role in numerous cognitive activities. Volume transmission is the major mode for 5-HT transmission but mechanisms underlying 5-HT signaling are still largely unknown. Abnormal brain 5-HT levels and function have been implicated in autism spectrum disorder (ASD). Neurexin (Nrxn) genes encode presynaptic cell adhesion molecules important for the regulation of synaptic neurotransmitter release, notably glutamatergic and GABAergic transmission. Mutations in Nrxn genes are associated with neurodevelopmental disorders including ASD. However, the role of Nrxn genes in the 5-HT system is poorly understood. Here, we generated a mouse model with all three Nrxn genes disrupted specifically in 5-HT neurons to study how Nrxns affect 5-HT transmission. Loss of Nrxns in 5-HT neurons reduced the number of serotonin neurons in the early postnatal stage, impaired 5-HT release, and decreased 5-HT release sites and serotonin transporter expression. Furthermore, 5-HT neuron-specific Nrxn knockout reduced sociability and increased depressive-like behavior. Our results highlight functional roles for Nrxns in 5-HT neurotransmission, 5-HT neuron survival, and the execution of complex behaviors.
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Affiliation(s)
- Amy Cheung
- Department of Neurobiology, University of Massachusetts Chan Medical SchoolWorcesterUnited States
- Brudnick Neuropsychiatric Research Institute, University of MassachusettsWorcesterUnited States
- Medical Scientist Training Program, University of MassachusettsWorcesterUnited States
| | - Kotaro Konno
- Department of Anatomy, Faculty of Medicine, Hokkaido UniversitySapporoJapan
| | - Yuka Imamura
- Departments of Pharmacology and Biochemistry & Molecular Biology, Institute for Personalized Medicine, Pennsylvania State University College of Medicine, 500 University DriveHersheyUnited States
| | - Aya Matsui
- Vollum Institute, Oregon Health & Science UniversityPortlandUnited States
| | - Manabu Abe
- Department of Animal Model Development, Brain Research Institute, Niigata UniversityNiigataJapan
| | - Kenji Sakimura
- Department of Animal Model Development, Brain Research Institute, Niigata UniversityNiigataJapan
| | - Toshikuni Sasaoka
- Department of Comparative and Experimental Medicine, Brain Research Institute, Niigata UniversityNiigataJapan
| | - Takeshi Uemura
- Division of Gene Research, Research Center for Advanced Science, Shinshu UniversityNaganoJapan
- Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu UniversityNaganoJapan
| | - Masahiko Watanabe
- Department of Anatomy, Faculty of Medicine, Hokkaido UniversitySapporoJapan
| | - Kensuke Futai
- Department of Neurobiology, University of Massachusetts Chan Medical SchoolWorcesterUnited States
- Brudnick Neuropsychiatric Research Institute, University of MassachusettsWorcesterUnited States
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18
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Kisner A, Polter AM. Maturation of glutamatergic transmission onto dorsal raphe serotonergic neurons. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.01.19.524776. [PMID: 36711665 PMCID: PMC9882295 DOI: 10.1101/2023.01.19.524776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Serotonergic neurons in the dorsal raphe nucleus (DRN) play important roles early in postnatal development in the maturation and modulation of higher order emotional, sensory, and cognitive circuitry. This unique position makes these cells a substrate by which early experience can be wired into brain. In this study, we have investigated the maturation of synapses onto dorsal raphe serotonergic neurons in typically developing male and female mice using whole-cell patch-clamp recordings in ex vivo brain slices. We show that while inhibition of these neurons is relatively stable across development, glutamatergic synapses greatly increase in strength between P6 and P21-23. In contrast to forebrain regions, where the components making up glutamatergic synapses are dynamic across early life, we find that the makeup of these synapses onto DRN serotonergic neurons is largely stable after P15. DRN excitatory synapses maintain a very high ratio of AMPA to NMDA receptors and a rectifying component of the AMPA response throughout the lifespan. Overall, these findings reveal that the development of serotonergic neurons is marked by a significant refinement of glutamatergic synapses during the first 3 postnatal weeks. This suggests this time as a sensitive period of heightened plasticity for integration of information from upstream brain areas and that genetic and environmental insults during this period could lead to alterations in serotonergic output, impacting both the development of forebrain circuits and lifelong neuromodulatory actions.
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Affiliation(s)
- Alexandre Kisner
- Department of Pharmacology and Physiology, George Washington University School of Medicine and Health Sciences, Washington, DC 20037
- Current address: Department of Neuroscience, American University, Washington DC 20016
| | - Abigail M. Polter
- Department of Pharmacology and Physiology, George Washington University School of Medicine and Health Sciences, Washington, DC 20037
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19
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Guo W, Fan S, Xiao D, He C, Guan M, Xiong W. A midbrain-reticulotegmental circuit underlies exaggerated startle under fear emotions. Mol Psychiatry 2022; 27:4881-4892. [PMID: 36117214 DOI: 10.1038/s41380-022-01782-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 09/02/2022] [Accepted: 09/05/2022] [Indexed: 01/19/2023]
Abstract
Exaggerated startle has been recognized as a core hyperarousal symptom of multiple fear-related anxiety disorders, such as post-traumatic stress disorder (PTSD) and panic disorder. However, the mechanisms driving this symptom are poorly understood. Here we reveal a neural projection from dorsal raphe nucleus (DRN) to a startle-controlling center reticulotegmental nucleus (RtTg) that mediates enhanced startle response under fear condition. Within RtTg, we identify an inhibitory microcircuit comprising GABAergic neurons in pericentral RtTg (RtTgP) and glutamatergic neurons in central RtTg (RtTgC). Inhibition of this RtTgP-RtTgC microcircuit leads to elevated startle amplitudes. Furthermore, we demonstrate that the conditioned fear-activated DRN 5-HTergic neurons send inhibitory projections to RtTgP GABAergic neurons, which in turn upregulate neuronal activities of RtTgC glutamatergic neurons. Chemogenetic activation of the DRN-RtTgP projections mimics the increased startle response under fear emotions. Moreover, conditional deletion of 5-HT1B receptor from RtTgP GABAergic neurons largely reverses the exaggeration of startle during conditioned fear. Thus, our study establishes the disinhibitory DRN-RtTgP-RtTgC circuit as a critical mechanism underlying exaggerated startle under fear emotions, and provides 5-HT1B receptor as a potential therapeutic target for treating hyperarousal symptom in fear-associated psychiatric disorders.
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Affiliation(s)
- Weiwei Guo
- Institute on Aging and Brain Disorders, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230026, China
| | - Sijia Fan
- Institute on Aging and Brain Disorders, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230026, China
| | - Dan Xiao
- Institute on Aging and Brain Disorders, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230026, China
| | - Chen He
- Institute on Aging and Brain Disorders, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230026, China
| | - Mengyuan Guan
- Institute on Aging and Brain Disorders, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230026, China
| | - Wei Xiong
- Institute on Aging and Brain Disorders, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230026, China. .,Institute of Artificial Intelligence, Hefei Comprehensive National Science Center, Hefei, 230088, China. .,Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, 200031, China.
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20
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Bohne P, Volkmann A, Schwarz MK, Mark MD. Deletion of the P/Q-Type Calcium Channel from Serotonergic Neurons Drives Male Aggression in Mice. J Neurosci 2022; 42:6637-6653. [PMID: 35853721 PMCID: PMC9410759 DOI: 10.1523/jneurosci.0204-22.2022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 06/27/2022] [Accepted: 06/30/2022] [Indexed: 11/25/2022] Open
Abstract
Aggressive behavior is one of the most conserved social interactions in nature and serves as a crucial evolutionary trait. Serotonin (5-HT) plays a key role in the regulation of our emotions, such as anxiety and aggression, but which molecules and mechanisms in the serotonergic system are involved in violent behavior are still unknown. In this study, we show that deletion of the P/Q-type calcium channel selectively from serotonergic neurons in the dorsal raphe nuclei (DRN) augments aggressive behavior in male mice, while anxiety is not affected. These mice demonstrated increased induction of the immediate early gene c-fos and in vivo serotonergic firing activity in the DRN. The ventrolateral part of the ventromedial hypothalamus is also a prominent region of the brain mediating aggression. We confirmed a monosynaptic projection from the DRN to the ventrolateral part of the ventromedial hypothalamus, and silencing these projections with an inhibitory designer receptor exclusively activated by a designer drug effectively reduced aggressive behavior. Overall, our findings show that deletion of the P/Q-type calcium channel from DRN neurons is sufficient to induce male aggression in mice and regulating its activity may serve as a therapeutic approach to treat violent behavior.SIGNIFICANCE STATEMENT In this study, we show that P/Q-type calcium channel is mediating aggression in serotonergic neurons from the dorsal raphe nucleus via monosynaptic projections to the ventrolateral part of the ventromedial hypothalamus. More importantly, silencing these projections reduced aggressive behavior in mice and may serve as a therapeutic approach for treating aggression in humans.
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Affiliation(s)
- Pauline Bohne
- Behavioral Neuroscience, Ruhr-University Bochum, Bochum, D-44780, Germany
| | - Achim Volkmann
- Behavioral Neuroscience, Ruhr-University Bochum, Bochum, D-44780, Germany
| | - Martin K Schwarz
- Institute of Experimental Epileptology and Cognition Research, University of Bonn Medical School, Bonn, D-53127, Germany
| | - Melanie D Mark
- Behavioral Neuroscience, Ruhr-University Bochum, Bochum, D-44780, Germany
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21
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Aby F, Lorenzo LE, Grivet Z, Bouali-Benazzouz R, Martin H, Valerio S, Whitestone S, Isabel D, Idi W, Bouchatta O, De Deurwaerdere P, Godin AG, Herry C, Fioramonti X, Landry M, De Koninck Y, Fossat P. Switch of serotonergic descending inhibition into facilitation by a spinal chloride imbalance in neuropathic pain. SCIENCE ADVANCES 2022; 8:eabo0689. [PMID: 35895817 PMCID: PMC9328683 DOI: 10.1126/sciadv.abo0689] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 06/13/2022] [Indexed: 06/15/2023]
Abstract
Descending control from the brain to the spinal cord shapes our pain experience, ranging from powerful analgesia to extreme sensitivity. Increasing evidence from both preclinical and clinical studies points to an imbalance toward descending facilitation as a substrate of pathological pain, but the underlying mechanisms remain unknown. We used an optogenetic approach to manipulate serotonin (5-HT) neurons of the nucleus raphe magnus that project to the dorsal horn of the spinal cord. We found that 5-HT neurons exert an analgesic action in naïve mice that becomes proalgesic in an experimental model of neuropathic pain. We show that spinal KCC2 hypofunction turns this descending inhibitory control into paradoxical facilitation; KCC2 enhancers restored 5-HT-mediated descending inhibition and analgesia. Last, combining selective serotonin reuptake inhibitors (SSRIs) with a KCC2 enhancer yields effective analgesia against nerve injury-induced pain hypersensitivity. This uncovers a previously unidentified therapeutic path for SSRIs against neuropathic pain.
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Affiliation(s)
- Franck Aby
- Université de Bordeaux, Bordeaux, France
- Institut des maladies neurodégénératives (IMN), CNRS UMR 5293, Bordeaux, France
| | - Louis-Etienne Lorenzo
- CERVO Brain Research Center, Université Laval, Québec City, Canada
- Department of Psychiatry and Neuroscience, Université Laval, Québec City, Canada
| | - Zoé Grivet
- Université de Bordeaux, Bordeaux, France
- Institut des maladies neurodégénératives (IMN), CNRS UMR 5293, Bordeaux, France
| | - Rabia Bouali-Benazzouz
- Université de Bordeaux, Bordeaux, France
- Institut des maladies neurodégénératives (IMN), CNRS UMR 5293, Bordeaux, France
| | - Hugo Martin
- NutriNeuro, UMR, INRAe, 1286 Bordeaux, France
| | | | - Sara Whitestone
- Université de Bordeaux, Bordeaux, France
- Institut des maladies neurodégénératives (IMN), CNRS UMR 5293, Bordeaux, France
| | - Dominique Isabel
- CERVO Brain Research Center, Université Laval, Québec City, Canada
- Department of Psychiatry and Neuroscience, Université Laval, Québec City, Canada
| | - Walid Idi
- Université de Bordeaux, Bordeaux, France
- Institut des maladies neurodégénératives (IMN), CNRS UMR 5293, Bordeaux, France
| | - Otmane Bouchatta
- Université de Bordeaux, Bordeaux, France
- Institut des maladies neurodégénératives (IMN), CNRS UMR 5293, Bordeaux, France
- CERVO Brain Research Center, Université Laval, Québec City, Canada
- Department of Psychiatry and Neuroscience, Université Laval, Québec City, Canada
- NutriNeuro, UMR, INRAe, 1286 Bordeaux, France
- Aquineuro, SA, Bordeaux, France
- Université Cadi Ayyad, Marrakech, Morocco
| | - Philippe De Deurwaerdere
- Université de Bordeaux, Bordeaux, France
- Institut des neurosciences cognitives et intégratives d’aquitaine (INCIA) CNRS UMR 5287, Bordeaux, France
| | - Antoine G. Godin
- CERVO Brain Research Center, Université Laval, Québec City, Canada
- Department of Psychiatry and Neuroscience, Université Laval, Québec City, Canada
| | - Cyril Herry
- Neurocentre Magendie, INSERM, U862, Bordeaux, France
| | | | - Marc Landry
- Université de Bordeaux, Bordeaux, France
- Institut des maladies neurodégénératives (IMN), CNRS UMR 5293, Bordeaux, France
| | - Yves De Koninck
- CERVO Brain Research Center, Université Laval, Québec City, Canada
- Department of Psychiatry and Neuroscience, Université Laval, Québec City, Canada
| | - Pascal Fossat
- Université de Bordeaux, Bordeaux, France
- Institut des maladies neurodégénératives (IMN), CNRS UMR 5293, Bordeaux, France
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22
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Cooper AH, Hedden NS, Prasoon P, Qi Y, Taylor BK. Postsurgical Latent Pain Sensitization Is Driven by Descending Serotonergic Facilitation and Masked by µ-Opioid Receptor Constitutive Activity in the Rostral Ventromedial Medulla. J Neurosci 2022; 42:5870-5881. [PMID: 35701159 PMCID: PMC9337598 DOI: 10.1523/jneurosci.2038-21.2022] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Revised: 05/22/2022] [Accepted: 05/27/2022] [Indexed: 01/29/2023] Open
Abstract
Following tissue injury, latent sensitization (LS) of nociceptive signaling can persist indefinitely, kept in remission by compensatory µ-opioid receptor constitutive activity (MORCA) in the dorsal horn of the spinal cord. To demonstrate LS, we conducted plantar incision in mice and then waited 3-4 weeks for hypersensitivity to resolve. At this time (remission), systemic administration of the opioid receptor antagonist/inverse agonist naltrexone reinstated mechanical and heat hypersensitivity. We first tested the hypothesis that LS extends to serotonergic neurons in the rostral ventral medulla (RVM) that convey pronociceptive input to the spinal cord. We report that in male and female mice, hypersensitivity was accompanied by increased Fos expression in serotonergic neurons of the RVM, abolished on chemogenetic inhibition of RVM 5-HT neurons, and blocked by intrathecal injection of the 5-HT3R antagonist ondansetron; the 5-HT2AR antagonist MDL-11 939 had no effect. Second, to test for MORCA, we microinjected the MOR inverse agonist d-Phe-Cys-Tyr-D-Trp-Arg-Thr-Pen-Thr-NH2 (CTAP) and/or neutral opioid receptor antagonist 6β-naltrexol. Intra-RVM CTAP produced mechanical hypersensitivity at both hindpaws; 6β-naltrexol had no effect by itself, but blocked CTAP-induced hypersensitivity. This indicates that MORCA, rather than an opioid ligand-dependent mechanism, maintains LS in remission. We conclude that incision establishes LS in descending RVM 5-HT neurons that drives pronociceptive 5-HT3R signaling in the dorsal horn, and this LS is tonically opposed by MORCA in the RVM. The 5-HT3 receptor is a promising therapeutic target for the development of drugs to prevent the transition from acute to chronic postsurgical pain.SIGNIFICANCE STATEMENT Surgery leads to latent pain sensitization and a compensatory state of endogenous pain control that is maintained long after tissue healing. Here, we show that either chemogenetic inhibition of serotonergic neuron activity in the RVM or pharmacological inhibition of 5-HT3 receptor signaling at the spinal cord blocks behavioral signs of postsurgical latent sensitization. We conclude that MORCA in the RVM opposes descending serotonergic facilitation of LS and that the 5-HT3 receptor is a promising therapeutic target for the development of drugs to prevent the transition from acute to chronic postsurgical pain.
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Affiliation(s)
- Andrew H Cooper
- Department of Anesthesiology and Perioperative Medicine, Pittsburgh Center for Pain Research, Pittsburgh Project to End Opioid Misuse, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
| | - Naomi S Hedden
- Department of Anesthesiology and Perioperative Medicine, Pittsburgh Center for Pain Research, Pittsburgh Project to End Opioid Misuse, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
| | - Pranav Prasoon
- Department of Anesthesiology and Perioperative Medicine, Pittsburgh Center for Pain Research, Pittsburgh Project to End Opioid Misuse, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
| | - Yanmei Qi
- Department of Anesthesiology and Perioperative Medicine, Pittsburgh Center for Pain Research, Pittsburgh Project to End Opioid Misuse, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
| | - Bradley K Taylor
- Department of Anesthesiology and Perioperative Medicine, Pittsburgh Center for Pain Research, Pittsburgh Project to End Opioid Misuse, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213
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23
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Li L, Wyler SC, León-Mercado LA, Xu B, Oh Y, Swati, Chen X, Wan R, Arnold AG, Jia L, Wang G, Nautiyal K, Hen R, Sohn JW, Liu C. Delineating a serotonin 1B receptor circuit for appetite suppression in mice. J Exp Med 2022; 219:213337. [PMID: 35796804 PMCID: PMC9270184 DOI: 10.1084/jem.20212307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 04/04/2022] [Accepted: 06/13/2022] [Indexed: 01/09/2023] Open
Abstract
Triptans are a class of commonly prescribed antimigraine drugs. Here, we report a previously unrecognized role for them to suppress appetite in mice. In particular, frovatriptan treatment reduces food intake and body weight in diet-induced obese mice. Moreover, the anorectic effect depends on the serotonin (5-HT) 1B receptor (Htr1b). By ablating Htr1b in four different brain regions, we demonstrate that Htr1b engages in spatiotemporally segregated neural pathways to regulate postnatal growth and food intake. Moreover, Htr1b in AgRP neurons in the arcuate nucleus of the hypothalamus (ARH) contributes to the hypophagic effects of HTR1B agonists. To further study the anorexigenic Htr1b circuit, we generated Htr1b-Cre mice. We find that ARH Htr1b neurons bidirectionally regulate food intake in vivo. Furthermore, single-nucleus RNA sequencing analyses revealed that Htr1b marks a subset of AgRP neurons. Finally, we used an intersectional approach to specifically target these neurons (Htr1bAgRP neurons). We show that they regulate food intake, in part, through a Htr1bAgRP→PVH circuit.
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Affiliation(s)
- Li Li
- The Hypothalamic Research Center, Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX
| | - Steven C. Wyler
- The Hypothalamic Research Center, Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX
| | - Luis A. León-Mercado
- The Hypothalamic Research Center, Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX
| | - Baijie Xu
- The Hypothalamic Research Center, Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX
| | - Youjin Oh
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - Swati
- The Hypothalamic Research Center, Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX
| | - Xiameng Chen
- The Hypothalamic Research Center, Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX
| | - Rong Wan
- The Hypothalamic Research Center, Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX
| | - Amanda G. Arnold
- The Hypothalamic Research Center, Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX
| | - Lin Jia
- Department of Biological Sciences, The University of Texas at Dallas, Richardson, TX
| | - Guanlin Wang
- Centre for Computational Biology, Medical Research Council Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Katherine Nautiyal
- Department of Psychological and Brain Sciences, Dartmouth College, Hanover, NH
| | - René Hen
- Department of Psychiatry, Columbia University and Research Foundation for Mental Hygiene, New York State Psychiatric Institute, New York, NY,Department of Neuroscience, Columbia University, New York, NY,Department of Pharmacology, Columbia University, New York, NY
| | - Jong-Woo Sohn
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Korea,Jong-Woo Sohn:
| | - Chen Liu
- The Hypothalamic Research Center, Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX,Department of Neuroscience, UT Southwestern Medical Center, Dallas, TX,Peter O’Donnell Jr. Brain Institute, UT Southwestern Medical Center, Dallas, TX,Correspondence to Chen Liu:
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24
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Zhang XL, Spencer WC, Tabuchi N, Kitt MM, Deneris ES. Reorganization of postmitotic neuronal chromatin accessibility for maturation of serotonergic identity. eLife 2022; 11:e75970. [PMID: 35471146 PMCID: PMC9098219 DOI: 10.7554/elife.75970] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 04/12/2022] [Indexed: 12/02/2022] Open
Abstract
Assembly of transcriptomes encoding unique neuronal identities requires selective accessibility of transcription factors to cis-regulatory sequences in nucleosome-embedded postmitotic chromatin. Yet, the mechanisms controlling postmitotic neuronal chromatin accessibility are poorly understood. Here, we show that unique distal enhancers define the Pet1 neuron lineage that generates serotonin (5-HT) neurons in mice. Heterogeneous single-cell chromatin landscapes are established early in postmitotic Pet1 neurons and reveal the putative regulatory programs driving Pet1 neuron subtype identities. Distal enhancer accessibility is highly dynamic as Pet1 neurons mature, suggesting the existence of regulatory factors that reorganize postmitotic neuronal chromatin. We find that Pet1 and Lmx1b control chromatin accessibility to select Pet1-lineage-specific enhancers for 5-HT neurotransmission. Additionally, these factors are required to maintain chromatin accessibility during early maturation suggesting that postmitotic neuronal open chromatin is unstable and requires continuous regulatory input. Together, our findings reveal postmitotic transcription factors that reorganize accessible chromatin for neuron specialization.
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Affiliation(s)
- Xinrui L Zhang
- Department of Neurosciences, Case Western Reserve UniversityClevelandUnited States
| | - William C Spencer
- Department of Neurosciences, Case Western Reserve UniversityClevelandUnited States
| | - Nobuko Tabuchi
- Department of Neurosciences, Case Western Reserve UniversityClevelandUnited States
| | - Meagan M Kitt
- Department of Neurosciences, Case Western Reserve UniversityClevelandUnited States
| | - Evan S Deneris
- Department of Neurosciences, Case Western Reserve UniversityClevelandUnited States
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25
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Kitt MM, Tabuchi N, Spencer WC, Robinson HL, Zhang XL, Eastman BA, Lobur KJ, Silver J, Mei L, Deneris ES. An adult-stage transcriptional program for survival of serotonergic connectivity. Cell Rep 2022; 39:110711. [PMID: 35443166 PMCID: PMC9109281 DOI: 10.1016/j.celrep.2022.110711] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 02/23/2022] [Accepted: 03/30/2022] [Indexed: 12/23/2022] Open
Abstract
Neurons must function for decades of life, but how these non-dividing cells are preserved is poorly understood. Using mouse serotonin (5-HT) neurons as a model, we report an adult-stage transcriptional program specialized to ensure the preservation of neuronal connectivity. We uncover a switch in Lmx1b and Pet1 transcription factor function from controlling embryonic axonal growth to sustaining a transcriptomic signature of 5-HT connectivity comprising functionally diverse synaptic and axonal genes. Adult-stage deficiency of Lmx1b and Pet1 causes slowly progressing degeneration of 5-HT synapses and axons, increased susceptibility of 5-HT axons to neurotoxic injury, and abnormal stress responses. Axon degeneration occurs in a die back pattern and is accompanied by accumulation of α-synuclein and amyloid precursor protein in spheroids and mitochondrial fragmentation without cell body loss. Our findings suggest that neuronal connectivity is transcriptionally protected by maintenance of connectivity transcriptomes; progressive decay of such transcriptomes may contribute to age-related diseases of brain circuitry.
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Affiliation(s)
- Meagan M Kitt
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Nobuko Tabuchi
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - W Clay Spencer
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Heath L Robinson
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Xinrui L Zhang
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Brent A Eastman
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Katherine J Lobur
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Jerry Silver
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Lin Mei
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Evan S Deneris
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA.
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26
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Bilodeau A, Delmas CVL, Parent M, De Koninck P, Durand A, Lavoie-Cardinal F. Microscopy analysis neural network to solve detection, enumeration and segmentation from image-level annotations. NAT MACH INTELL 2022. [DOI: 10.1038/s42256-022-00472-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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27
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Eacret D, Noreck J, Blendy J. Adenosine Monophosphate-activated Protein Kinase (AMPK) in serotonin neurons mediates select behaviors during protracted withdrawal from morphine in mice. Behav Brain Res 2022; 419:113688. [PMID: 34843742 PMCID: PMC8688336 DOI: 10.1016/j.bbr.2021.113688] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 11/11/2021] [Accepted: 11/23/2021] [Indexed: 01/02/2023]
Abstract
Serotonin neurotransmission has been implicated in behavior deficits that occur during protracted withdrawal from opioids. In addition, studies have highlighted multiple pathways whereby serotonin (5-HT) modulates energy homeostasis, however the underlying metabolic effects of opioid withdrawal have not been investigated. A key metabolic regulator that senses the energy status of the cell and regulates fuel availability is Adenosine Monophosphate-activated Protein Kinase (AMPK). To investigate the interaction between cellular metabolism and serotonin in modulating protracted abstinence from morphine, we depleted AMPK in serotonin neurons. Morphine exposure via drinking water generates dependence in these mice, and both wildtype and serotonergic AMPK knockout mice consume similar amounts of morphine with no changes in body weight. Serotonergic AMPK contributes to baseline differences in open field and social interaction behaviors and blocks abstinence induced reductions in immobility following morphine withdrawal in the tail suspension test. Lastly, morphine locomotor sensitization is blunted in mice lacking AMPK in serotonin neurons. Taken together, our results suggest serotonergic AMPK mediates both baseline and protracted morphine withdrawal-induced behaviors.
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Affiliation(s)
- D. Eacret
- Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - J. Noreck
- Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - J.A. Blendy
- Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA,Corresponding author , Phone: (215) 898-0730, Fax: (215) 573-2236
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28
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Neural serotonergic circuits for controlling long-term voluntary alcohol consumption in mice. Mol Psychiatry 2022; 27:4599-4610. [PMID: 36195637 PMCID: PMC9531213 DOI: 10.1038/s41380-022-01789-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 09/05/2022] [Accepted: 09/09/2022] [Indexed: 12/14/2022]
Abstract
Alcohol-use-disorders are chronic relapsing illnesses, often co-morbid with anxiety. We have previously shown using the "drinking-in-the-dark" model in mice that the stimulation of the serotonin receptor 1A (5-HT1A) reduces ethanol binge-drinking behaviour and withdrawal-induced anxiety. The 5-HT1A receptor is located either on Raphe neurons as autoreceptors, or on target neurons as heteroreceptors. By combining a pharmacological approach with biased agonists targeting the 5-HT1A auto- or heteroreceptor and a chemogenetic approach (DREADDs), here we identified that ethanol-binge drinking behaviour is dependent on 5-HT1A autoreceptors and 5-HT neuronal function, with a transition from DRN-dependent regulation of short-term (6 weeks) ethanol intake, to MRN-dependent regulation after longer ethanol exposure (12 weeks). We further identified a serotonergic microcircuit (5-HTMRN→DG) originating from the MRN and projecting to the dentate gyrus (DG) of the hippocampus, that is specifically affected by, and modulates long-term ethanol consumption. The present study indicates that targeting Raphe nuclei 5-HT1A autoreceptors with agonists might represent an innovative pharmacotherapeutic strategy to combat alcohol abuse.
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29
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Barettino C, Ballesteros-Gonzalez Á, Aylón A, Soler-Sanchis X, Ortí L, Díaz S, Reillo I, García-García F, Iborra FJ, Lai C, Dehorter N, Leinekugel X, Flames N, Del Pino I. Developmental Disruption of Erbb4 in Pet1+ Neurons Impairs Serotonergic Sub-System Connectivity and Memory Formation. Front Cell Dev Biol 2021; 9:770458. [PMID: 34957103 PMCID: PMC8703035 DOI: 10.3389/fcell.2021.770458] [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: 09/03/2021] [Accepted: 11/19/2021] [Indexed: 11/30/2022] Open
Abstract
The serotonergic system of mammals innervates virtually all the central nervous system and regulates a broad spectrum of behavioral and physiological functions. In mammals, serotonergic neurons located in the rostral raphe nuclei encompass diverse sub-systems characterized by specific circuitry and functional features. Substantial evidence suggest that functional diversity of serotonergic circuits has a molecular and connectivity basis. However, the landscape of intrinsic developmental mechanisms guiding the formation of serotonergic sub-systems is unclear. Here, we employed developmental disruption of gene expression specific to serotonergic subsets to probe the contribution of the tyrosine kinase receptor ErbB4 to serotonergic circuit formation and function. Through an in vivo loss-of-function approach, we found that ErbB4 expression occurring in a subset of serotonergic neurons, is necessary for axonal arborization of defined long-range projections to the forebrain but is dispensable for the innervation of other targets of the serotonergic system. We also found that Erbb4-deletion does not change the global excitability or the number of neurons with serotonin content in the dorsal raphe nuclei. In addition, ErbB4-deficiency in serotonergic neurons leads to specific behavioral deficits in memory processing that involve aversive or social components. Altogether, our work unveils a developmental mechanism intrinsically acting through ErbB4 in subsets of serotonergic neurons to orchestrate a precise long-range circuit and ultimately involved in the formation of emotional and social memories.
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Affiliation(s)
- Candela Barettino
- Neural Plasticity Laboratory, Príncipe Felipe Research Center, Valencia, Spain
| | | | - Andrés Aylón
- Neural Plasticity Laboratory, Príncipe Felipe Research Center, Valencia, Spain
| | | | - Leticia Ortí
- Neural Plasticity Laboratory, Príncipe Felipe Research Center, Valencia, Spain
| | - Selene Díaz
- Neural Plasticity Laboratory, Príncipe Felipe Research Center, Valencia, Spain
| | - Isabel Reillo
- Developmental Neurobiology Unit, Instituto de Biomedicina de Valencia, IBV-CSIC, Valencia, Spain
| | - Francisco García-García
- Bioinformatics and Biostatistics Unit, Príncipe Felipe Research Center (CIPF), Valencia, Spain
| | | | - Cary Lai
- Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN, United States
| | | | - Xavier Leinekugel
- Institut de Neurobiology de la Méditerranée (INMED, UMR1249), INSERM, Marseille, France
| | - Nuria Flames
- Developmental Neurobiology Unit, Instituto de Biomedicina de Valencia, IBV-CSIC, Valencia, Spain
| | - Isabel Del Pino
- Neural Plasticity Laboratory, Príncipe Felipe Research Center, Valencia, Spain
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30
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Liu Y, Wu M, Sun Z, Li Q, Jiang R, Meng F, Liu J, Wang W, Dai J, Li C, Jiang S. Effect of PPM1F in dorsal raphe 5-HT neurons in regulating methamphetamine-induced conditioned place preference performance in mice. Brain Res Bull 2021; 179:36-48. [PMID: 34871711 DOI: 10.1016/j.brainresbull.2021.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 11/18/2021] [Accepted: 12/01/2021] [Indexed: 11/02/2022]
Abstract
Methamphetamine (METH), a synthetically produced central nervous system stimulant, is one of the most illicit and addictive drugs worldwide. Protein phosphatase Mg2 + /Mn2 + -dependent 1F F (PPM1F) has been reported to exert multiple biological and cellular functions. Nevertheless, the effects of PPM1F and its neuronal substrates on METH addiction remain unclear. Herein, we first established a METH-induced conditioned place preference (CPP) mouse model. We showed that PPM1F is widely distributed in 5-HT neurons of the dorsal raphe nucleus (DRN), and METH treatment decreased the expression of PPM1F in DRN, which was negatively correlated with METH-induced CPP behaviors. Knockout of PPM1F mediated by adeno-associated virus (AAV) in DRN produced enhanced susceptibility to METH-induced CPP, whereas the overexpression of PPM1F in DRN attenuated METH-induced CPP phenotypes. The expression levels of Tryptophan hydroxylase2 (TPH2) and serotonin transporter (SERT) were down-regulated with a concurrent reduction in 5-hydroxytryptamine (5-HT), tryptophan hydroxylase2 (TPH2)-immunoreactivity neurons and 5-HT levels in DRN of PPM1F knockout mice. In the end, decreased expression levels of PPM1F were found in the blood of METH abusers and METH-taking mice. These results suggest that PPM1F in DRN 5-HT neurons regulates METH-induced CPP behaviors by modulating the key components of the 5-HT neurotransmitter system, which might be an important pathological gene and diagnostic marker for METH-induced addiction.
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Affiliation(s)
- Yong Liu
- Department of Physiology, Binzhou Medical University, Shandong, China; Medical research center, Binzhou Medical University Hospital, Binzhou, Shandong, China; Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China.
| | - Min Wu
- Medical research center, Binzhou Medical University Hospital, Binzhou, Shandong, China; Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China; Neurosurgery, Binzhou Medical University Hospital, Binzhou, Shandong, China.
| | - Zongyue Sun
- Department of Physiology, Binzhou Medical University, Shandong, China.
| | - Qiongyu Li
- Medical research center, Binzhou Medical University Hospital, Binzhou, Shandong, China; Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China; Department of Gastroenterology, Binzhou Medical University Hospital, Binzhou, Shandong, China.
| | - Rong Jiang
- Department of Physiology, Binzhou Medical University, Shandong, China.
| | - Fantao Meng
- Medical research center, Binzhou Medical University Hospital, Binzhou, Shandong, China; Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China.
| | - Jing Liu
- Medical research center, Binzhou Medical University Hospital, Binzhou, Shandong, China; Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China.
| | - Wentao Wang
- Medical research center, Binzhou Medical University Hospital, Binzhou, Shandong, China; Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China.
| | - Juanjuan Dai
- Medical research center, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Chen Li
- Medical research center, Binzhou Medical University Hospital, Binzhou, Shandong, China; Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China.
| | - Shujun Jiang
- Department of Physiology, Binzhou Medical University, Shandong, China.
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31
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Cunha C, Smiley JF, Chuhma N, Shah R, Bleiwas C, Menezes EC, Seal RP, Edwards RH, Rayport S, Ansorge MS, Castellanos FX, Teixeira CM. Perinatal interference with the serotonergic system affects VTA function in the adult via glutamate co-transmission. Mol Psychiatry 2021; 26:4795-4812. [PMID: 32398719 PMCID: PMC7657958 DOI: 10.1038/s41380-020-0763-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 04/07/2020] [Accepted: 04/27/2020] [Indexed: 11/29/2022]
Abstract
Serotonin and dopamine are associated with multiple psychiatric disorders. How they interact during development to affect subsequent behavior remains unknown. Knockout of the serotonin transporter or postnatal blockade with selective serotonin reuptake inhibitors (SSRIs) leads to novelty-induced exploration deficits in adulthood, potentially involving the dopamine system. Here, we show in the mouse that raphe nucleus serotonin neurons activate ventral tegmental area dopamine neurons via glutamate co-transmission and that this co-transmission is reduced in animals exposed postnatally to SSRIs. Blocking serotonin neuron glutamate co-transmission mimics this SSRI-induced hypolocomotion, while optogenetic activation of dopamine neurons reverses this hypolocomotor phenotype. Our data demonstrate that serotonin neurons modulate dopamine neuron activity via glutamate co-transmission and that this pathway is developmentally malleable, with high serotonin levels during early life reducing co-transmission, revealing the basis for the reduced novelty-induced exploration in adulthood due to postnatal SSRI exposure.
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Affiliation(s)
- Catarina Cunha
- Emotional Brain Institute, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY, 10962, USA
- Department of Child and Adolescent Psychiatry, New York University Grossman School of Medicine, New York, NY, 10016, USA
| | - John F Smiley
- Emotional Brain Institute, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY, 10962, USA
- Department of Child and Adolescent Psychiatry, New York University Grossman School of Medicine, New York, NY, 10016, USA
| | - Nao Chuhma
- Department of Psychiatry, Columbia University and New York State Psychiatric Institute, New York, NY, 10032, USA
- Department of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY, 10032, USA
| | - Relish Shah
- Emotional Brain Institute, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY, 10962, USA
| | - Cynthia Bleiwas
- Emotional Brain Institute, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY, 10962, USA
| | - Edenia C Menezes
- Emotional Brain Institute, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY, 10962, USA
| | - Rebecca P Seal
- Department of Neurobiology and Department of Otolaryngology, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15260, USA
| | - Robert H Edwards
- Departments of Neurology and Physiology, University of California, San Francisco School of Medicine, San Francisco, CA, 94143, USA
| | - Stephen Rayport
- Department of Psychiatry, Columbia University and New York State Psychiatric Institute, New York, NY, 10032, USA
- Department of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY, 10032, USA
| | - Mark S Ansorge
- Department of Psychiatry, Columbia University and New York State Psychiatric Institute, New York, NY, 10032, USA
- Department of Developmental Neuroscience, New York State Psychiatric Institute, New York, NY, 10032, USA
| | - Francisco X Castellanos
- Emotional Brain Institute, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY, 10962, USA
- Department of Child and Adolescent Psychiatry, New York University Grossman School of Medicine, New York, NY, 10016, USA
| | - Catia M Teixeira
- Emotional Brain Institute, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY, 10962, USA.
- Department of Child and Adolescent Psychiatry, New York University Grossman School of Medicine, New York, NY, 10016, USA.
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32
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Lesiak AJ, Coffey K, Cohen JH, Liang KJ, Chavkin C, Neumaier JF. Sequencing the serotonergic neuron translatome reveals a new role for Fkbp5 in stress. Mol Psychiatry 2021; 26:4742-4753. [PMID: 32366949 PMCID: PMC7609479 DOI: 10.1038/s41380-020-0750-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 04/03/2020] [Accepted: 04/20/2020] [Indexed: 01/30/2023]
Abstract
Serotonin is a key mediator of stress, anxiety, and depression, and novel therapeutic targets within serotonin neurons are needed to combat these disorders. To determine how stress alters the translational profile of serotonin neurons, we sequenced ribosome-associated RNA from these neurons after repeated stress in male and female mice. We identified numerous sex- and stress-regulated genes. In particular, Fkbp5 mRNA, which codes for the glucocorticoid receptor co-chaperone protein FKBP51, was consistently upregulated in male and female mice following stress. Pretreatment with a selective FKBP51 inhibitor into the dorsal raphe prior to repeated forced swim stress decreased resulting stress-induced anhedonia. Our results support previous findings linking FKBP51 to stress-related disorders and provide the first evidence suggesting that FKBP51 function may be an important regulatory node integrating circulating stress hormones and serotonergic regulation of stress responses.
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Affiliation(s)
- Atom J Lesiak
- Department of Psychiatry & Behavioral Sciences, University of Washington, Seattle, WA, 98104, USA
| | - Kevin Coffey
- Department of Psychiatry & Behavioral Sciences, University of Washington, Seattle, WA, 98104, USA
| | - Joshua H Cohen
- Department of Pharmacology, University of Washington, Seattle, WA, 98195, USA
| | - Katharine J Liang
- Department of Psychiatry & Behavioral Sciences, University of Washington, Seattle, WA, 98104, USA
| | - Charles Chavkin
- Department of Pharmacology, University of Washington, Seattle, WA, 98195, USA
| | - John F Neumaier
- Department of Psychiatry & Behavioral Sciences, University of Washington, Seattle, WA, 98104, USA.
- Department of Pharmacology, University of Washington, Seattle, WA, 98195, USA.
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33
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An optimized registration workflow and standard geometric space for small animal brain imaging. Neuroimage 2021; 241:118386. [PMID: 34280528 DOI: 10.1016/j.neuroimage.2021.118386] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 07/08/2021] [Accepted: 07/10/2021] [Indexed: 11/23/2022] Open
Abstract
The reliability of scientific results critically depends on reproducible and transparent data processing. Cross-subject and cross-study comparability of imaging data in general, and magnetic resonance imaging (MRI) data in particular, is contingent on the quality of registration to a standard reference space. In small animal MRI this is not adequately provided by currently used processing workflows, which utilize high-level scripts optimized for human data, and adapt animal data to fit the scripts, rather than vice-versa. In this fully reproducible article we showcase a generic workflow optimized for the mouse brain, alongside a standard reference space suited to harmonize data between analysis and operation. We introduce four separate metrics for automated quality control (QC), and a visualization method to aid operator inspection. Benchmarking this workflow against common legacy practices reveals that it performs more consistently, better preserves variance across subjects while minimizing variance across sessions, and improves both volume and smoothness conservation RMSE approximately 2-fold. We propose this open source workflow and the QC metrics as a new standard for small animal MRI registration, ensuring workflow robustness, data comparability, and region assignment validity, all of which are indispensable prerequisites for the comparability of scientific results across experiments and centers.
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34
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Han Y, Xia G, Srisai D, Meng F, He Y, Ran Y, He Y, Farias M, Hoang G, Tóth I, Dietrich MO, Chen MH, Xu Y, Wu Q. Deciphering an AgRP-serotoninergic neural circuit in distinct control of energy metabolism from feeding. Nat Commun 2021; 12:3525. [PMID: 34112797 PMCID: PMC8192783 DOI: 10.1038/s41467-021-23846-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 05/10/2021] [Indexed: 12/14/2022] Open
Abstract
Contrasting to the established role of the hypothalamic agouti-related protein (AgRP) neurons in feeding regulation, the neural circuit and signaling mechanisms by which they control energy expenditure remains unclear. Here, we report that energy expenditure is regulated by a subgroup of AgRP neurons that send non-collateral projections to neurons within the dorsal lateral part of dorsal raphe nucleus (dlDRN) expressing the melanocortin 4 receptor (MC4R), which in turn innervate nearby serotonergic (5-HT) neurons. Genetic manipulations reveal a bi-directional control of energy expenditure by this circuit without affecting food intake. Fiber photometry and electrophysiological results indicate that the thermo-sensing MC4RdlDRN neurons integrate pre-synaptic AgRP signaling, thereby modulating the post-synaptic serotonergic pathway. Specifically, the MC4RdlDRN signaling elicits profound, bi-directional, regulation of body weight mainly through sympathetic outflow that reprograms mitochondrial bioenergetics within brown and beige fat while feeding remains intact. Together, we suggest that this AgRP neural circuit plays a unique role in persistent control of energy expenditure and body weight, hinting next-generation therapeutic approaches for obesity and metabolic disorders.
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Affiliation(s)
- Yong Han
- USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Guobin Xia
- USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Dollada Srisai
- Department of Molecular Physiology & Biophysics, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Fantao Meng
- USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
- Department of Neurology and Neurotherapeutics, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Yanlin He
- USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
- Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, LA, 70808, United States
| | - Yali Ran
- USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Yang He
- USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Monica Farias
- USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Giang Hoang
- USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - István Tóth
- Department of Physiology and Biochemistry, Szent Istvan University, Budapeste, Hungary
- Department of Comparative Medicine and Department of Neurobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Marcelo O Dietrich
- Department of Comparative Medicine and Department of Neurobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Miao-Hsueh Chen
- USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Yong Xu
- USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Qi Wu
- USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA.
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA.
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35
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Venner A, Broadhurst RY, Sohn LT, Todd WD, Fuller PM. Selective activation of serotoninergic dorsal raphe neurons facilitates sleep through anxiolysis. Sleep 2021; 43:5573750. [PMID: 31553451 DOI: 10.1093/sleep/zsz231] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 08/18/2019] [Indexed: 11/12/2022] Open
Abstract
A role for the brain's serotoninergic (5HT) system in the regulation of sleep and wakefulness has been long suggested. Yet, previous studies employing pharmacological, lesion and genetically driven approaches have produced inconsistent findings, leaving 5HT's role in sleep-wake regulation incompletely understood. Here we sought to define the specific contribution of 5HT neurons within the dorsal raphe nucleus (DRN5HT) to sleep and arousal control. To do this, we employed a chemogenetic strategy to selectively and acutely activate DRN5HT neurons and monitored sleep-wake using electroencephalogram recordings. We additionally assessed indices of anxiety using the open field and elevated plus maze behavioral tests and employed telemetric-based recordings to test effects of acute DRN5HT activation on body temperature and locomotor activity. Our findings indicate that the DRN5HT cell population may not modulate sleep-wake per se, but rather that its activation has apparent anxiolytic properties, suggesting the more nuanced view that DRN5HT neurons are sleep permissive under circumstances that produce anxiety or stress.
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Affiliation(s)
- Anne Venner
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA.,Division of Sleep Medicine, Harvard Medical School, Boston, MA
| | - Rebecca Y Broadhurst
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA.,Division of Sleep Medicine, Harvard Medical School, Boston, MA
| | - Lauren T Sohn
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA.,Division of Sleep Medicine, Harvard Medical School, Boston, MA
| | - William D Todd
- Department of Zoology and Physiology, University of Wyoming, Laramie, WY.,Program in Neuroscience, University of Wyoming, Laramie, WY
| | - Patrick M Fuller
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA.,Division of Sleep Medicine, Harvard Medical School, Boston, MA
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36
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Jancke D, Herlitze S, Kringelbach ML, Deco G. Bridging the gap between single receptor type activity and whole-brain dynamics. FEBS J 2021; 289:2067-2084. [PMID: 33797854 DOI: 10.1111/febs.15855] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 03/15/2021] [Accepted: 03/31/2021] [Indexed: 02/05/2023]
Abstract
What is the effect of activating a single modulatory neuronal receptor type on entire brain network dynamics? Can such effect be isolated at all? These are important questions because characterizing elementary neuronal processes that influence network activity across the given anatomical backbone is fundamental to guide theories of brain function. Here, we introduce the concept of the cortical 'receptome' taking into account the distribution and densities of expression of different modulatory receptor types across the brain's anatomical connectivity matrix. By modelling whole-brain dynamics in silico, we suggest a bidirectional coupling between modulatory neurotransmission and neuronal connectivity hardware exemplified by the impact of single serotonergic (5-HT) receptor types on cortical dynamics. As experimental support of this concept, we show how optogenetic tools enable specific activation of a single 5-HT receptor type across the cortex as well as in vivo measurement of its distinct effects on cortical processing. Altogether, we demonstrate how the structural neuronal connectivity backbone and its modulation by a single neurotransmitter system allow access to a rich repertoire of different brain states that are fundamental for flexible behaviour. We further propose that irregular receptor expression patterns-genetically predisposed or acquired during a lifetime-may predispose for neuropsychiatric disorders like addiction, depression and anxiety along with distinct changes in brain state. Our long-term vision is that such diseases could be treated through rationally targeted therapeutic interventions of high specificity to eventually recover natural transitions of brain states.
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Affiliation(s)
- Dirk Jancke
- Optical Imaging Group, Institut für Neuroinformatik, Ruhr University Bochum, Germany.,International Graduate School of Neuroscience (IGSN), Ruhr University Bochum, Germany
| | - Stefan Herlitze
- Department of General Zoology and Neurobiology, Ruhr University, Bochum, Germany
| | - Morten L Kringelbach
- Department of Psychiatry, University of Oxford, UK.,Center for Music in the Brain, Department of Clinical Medicine, Aarhus University, Denmark.,Life and Health Sciences Research Institute, School of Medicine, University of Minho, Braga, Portugal.,Centre for Eudaimonia and Human Flourishing, University of Oxford, UK
| | - Gustavo Deco
- Center for Brain and Cognition, Computational Neuroscience Group, Universitat Pompeu Fabra, Barcelona, Spain.,Institució Catalana de la Recerca i Estudis Avançats, Barcelona, Spain.,Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany.,School of Psychological Sciences, Monash University, Clayton, Melbourne, Australia
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37
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Zhang S, Chen Y, Wang Y, Zhang P, Chen G, Zhou Y. Insights Into Translatomics in the Nervous System. Front Genet 2021; 11:599548. [PMID: 33408739 PMCID: PMC7779767 DOI: 10.3389/fgene.2020.599548] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Accepted: 11/30/2020] [Indexed: 12/11/2022] Open
Abstract
Most neurological disorders are caused by abnormal gene translation. Generally, dysregulation of elements involved in the translational process disrupts homeostasis in neurons and neuroglia. Better understanding of how the gene translation process occurs requires detailed analysis of transcriptomic and proteomic profile data. However, a lack of strictly direct correlations between mRNA and protein levels limits translational investigation by combining transcriptomic and proteomic profiling. The much better correlation between proteins and translated mRNAs than total mRNAs in abundance and insufficiently sensitive proteomics approach promote the requirement of advances in translatomics technology. Translatomics which capture and sequence the mRNAs associated with ribosomes has been effective in identifying translational changes by genetics or projections, ribosome stalling, local translation, and transcript isoforms in the nervous system. Here, we place emphasis on the main three translatomics methods currently used to profile mRNAs attached to ribosome-nascent chain complex (RNC-mRNA). Their prominent applications in neurological diseases including glioma, neuropathic pain, depression, fragile X syndrome (FXS), neurodegenerative disorders are outlined. The content reviewed here expands our understanding on the contributions of aberrant translation to neurological disease development.
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Affiliation(s)
- Shuxia Zhang
- Department of Anesthesiology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Yeru Chen
- Department of Anesthesiology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Yongjie Wang
- Key Laboratory of Elemene Anti-Cancer Medicine of Zhejiang Province and Holistic Integrative Pharmacy Institutes, Hangzhou Normal University, Hangzhou, China.,Engineering Laboratory of Development and Application of Traditional Chinese Medicine from Zhejiang Province, Holistic Integrative Pharmacy Institutes, Hangzhou Normal University, Hangzhou, China
| | - Piao Zhang
- Department of Anesthesiology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Gang Chen
- Department of Anesthesiology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Youfa Zhou
- Department of Anesthesiology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, China
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38
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Li C, Meng F, Garza JC, Liu J, Lei Y, Kirov SA, Guo M, Lu XY. Modulation of depression-related behaviors by adiponectin AdipoR1 receptors in 5-HT neurons. Mol Psychiatry 2021; 26:4205-4220. [PMID: 31980728 PMCID: PMC7377958 DOI: 10.1038/s41380-020-0649-0] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 12/20/2019] [Accepted: 01/10/2020] [Indexed: 01/17/2023]
Abstract
The adipocyte-derived hormone adiponectin has a broad spectrum of functions beyond metabolic control. We previously reported that adiponectin acts in the brain to regulate depression-related behaviors. However, its underlying neural substrates have not been identified. Here we show that adiponectin receptor 1 (AdipoR1) is expressed in the dorsal raphe nucleus (DRN) and colocalized with tryptophan hydroxylase 2 (TPH2), a marker of serotonin (5-HT) neurons. Selective deletion of AdipoR1 in 5-HT neurons induced anhedonia in male mice, as indicated by reduced female urine sniffing time and saccharin preference, and behavioral despair in female mice and enhanced stress-induced decrease in sucrose preference in both sexes. The expression levels of TPH2 were downregulated with a concurrent reduction of 5-HT-immunoreactivity in the DRN and its two major projection regions, the hippocampus and medial prefrontal cortex (mPFC), in male but not female mice lacking AdipoR1 in 5-HT neurons. In addition, serotonin transporter (SERT) expression was upregulated in both DRN projection fields of male mice but only in the mPFC of female mice. These changes presumably lead to decreased 5-HT synthesis and/or increased 5-HT reuptake, thereby reducing 5-HT transmission. The augmented behavioral responses to the selective serotonin reuptake inhibitor fluoxetine but not desipramine, a selective norepinephrine reuptake inhibitor, observed in conditional knockout male mice supports deficient 5-HT transmission underlying depression-related phenotypes. Our results indicate that adiponectin acts on 5-HT neurons through AdipoR1 receptors to regulate depression-related behaviors in a sex-dependent manner.
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Affiliation(s)
- Chen Li
- Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China. .,Department of Neuroscience & Regenerative Medicine, Medical College of Georgia at Augusta University, Augusta, GA, USA.
| | - Fantao Meng
- grid.452240.5Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong China
| | - Jacob C. Garza
- grid.410427.40000 0001 2284 9329Department of Neuroscience & Regenerative Medicine, Medical College of Georgia at Augusta University, Augusta, GA USA ,grid.38142.3c000000041936754XPresent Address: Center for Genomic Medicine and Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Boston, MA USA
| | - Jing Liu
- grid.452240.5Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong China
| | - Yun Lei
- grid.410427.40000 0001 2284 9329Department of Neuroscience & Regenerative Medicine, Medical College of Georgia at Augusta University, Augusta, GA USA
| | - Sergei A. Kirov
- grid.410427.40000 0001 2284 9329Department of Neuroscience & Regenerative Medicine, Medical College of Georgia at Augusta University, Augusta, GA USA
| | - Ming Guo
- grid.452240.5Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong China ,grid.410427.40000 0001 2284 9329Department of Neuroscience & Regenerative Medicine, Medical College of Georgia at Augusta University, Augusta, GA USA
| | - Xin-Yun Lu
- Department of Neuroscience & Regenerative Medicine, Medical College of Georgia at Augusta University, Augusta, GA, USA.
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Petrucci AN, Joyal KG, Chou JW, Li R, Vencer KM, Buchanan GF. Post-ictal Generalized EEG Suppression is reduced by Enhancing Dorsal Raphe Serotonergic Neurotransmission. Neuroscience 2020; 453:206-221. [PMID: 33242541 DOI: 10.1016/j.neuroscience.2020.11.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 11/14/2020] [Accepted: 11/16/2020] [Indexed: 01/02/2023]
Abstract
Sudden unexpected death in epilepsy (SUDEP) is the leading cause of death in patients with refractory epilepsy. A proposed risk marker for SUDEP is the duration of post-ictal generalized EEG suppression (PGES). The mechanisms underlying PGES are unknown. Serotonin (5-HT) has been implicated in SUDEP pathophysiology. Seizures suppress activity of 5-HT neurons in the dorsal raphe nucleus (DRN). We hypothesized that suppression of DRN 5-HT neuron activity contributes to PGES and increasing 5-HT neurotransmission or stimulating the DRN before a seizure would decrease PGES duration. Adult C57BL/6J and Pet1-Cre mice received EEG/EMG electrodes, a bipolar stimulating/recording electrode in the right basolateral amygdala, and either a microdialysis guide cannula or an injection of adeno-associated virus (AAV) allowing expression of channelrhodopsin2 plus an optic fiber into the DRN. Systemic application of the selective 5-HT reuptake inhibitor citalopram (20 mg/kg) decreased PGES duration from seizures induced during wake (n = 23) and non-rapid eye movement (NREM) sleep (n = 13) whereas fluoxetine (10 mg/kg) pretreatment decreased PGES duration following seizures induced from wake (n = 11), but not NREM sleep (n = 9). Focal chemical (n = 6) or optogenetic (n = 8) stimulation of the DRN reduced PGES duration following seizures in kindled mice induced during wake. During PGES, animals exhibited immobility and suppression of EEG activity that was reduced by citalopram pretreatment. These results suggest 5-HT and the DRN may regulate PGES.
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Affiliation(s)
- Alexandra N Petrucci
- Interdisciplinary Graduate Program in Neuroscience, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States; Department of Neurology, Carver College of Medicine, Carver College of Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States; Iowa Neuroscience Institute, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States.
| | - Katelyn G Joyal
- Interdisciplinary Graduate Program in Neuroscience, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States; Department of Neurology, Carver College of Medicine, Carver College of Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States; Iowa Neuroscience Institute, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States.
| | - Jonathan W Chou
- Department of Neurology, Carver College of Medicine, Carver College of Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States; Department of Health and Human Physiology, College of Liberal Arts and Sciences, University of Iowa, Iowa City, IA 52242, United States.
| | - Rui Li
- Department of Neurology, Carver College of Medicine, Carver College of Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States; Iowa Neuroscience Institute, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States.
| | - Kimberly M Vencer
- Iowa Neuroscience Institute, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States; Department of Health and Human Physiology, College of Liberal Arts and Sciences, University of Iowa, Iowa City, IA 52242, United States
| | - Gordon F Buchanan
- Interdisciplinary Graduate Program in Neuroscience, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States; Department of Neurology, Carver College of Medicine, Carver College of Medicine, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States; Iowa Neuroscience Institute, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States.
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Sex-Specific Role for Dopamine Receptor D2 in Dorsal Raphe Serotonergic Neuron Modulation of Defensive Acoustic Startle and Dominance Behavior. eNeuro 2020; 7:ENEURO.0202-20.2020. [PMID: 33214315 PMCID: PMC7768286 DOI: 10.1523/eneuro.0202-20.2020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 10/19/2020] [Accepted: 11/09/2020] [Indexed: 11/27/2022] Open
Abstract
Brain networks underlying states of social and sensory alertness are normally adaptive, influenced by serotonin and dopamine (DA), and abnormal in neuropsychiatric disorders, often with sex-specific manifestations. Underlying circuits, cells, and molecules are just beginning to be delineated. Implicated is a subtype of serotonergic neuron denoted Drd2-Pet1, distinguished by expression of the type-2 DA receptor (Drd2) gene, inhibited cell-autonomously by DRD2 agonism in slice, and, when constitutively silenced in male mice, affects levels of defensive and exploratory behaviors (Niederkofler et al., 2016). Unknown has been whether DRD2 signaling in these Pet1 neurons contributes to their capacity for shaping defensive behaviors. To address this, we generated mice in which Drd2 gene sequences were deleted selectively in Pet1 neurons. We found that Drd2Pet1-CKO males, but not females, demonstrated increased winning against sex-matched controls in a social dominance assay. Drd2Pet1-CKO females, but not males, exhibited blunting of the acoustic startle response, a protective, defensive reflex. Indistinguishable from controls were auditory brainstem responses (ABRs), locomotion, cognition, and anxiety-like and depression-like behaviors. Analyzing wild-type Drd2-Pet1 neurons, we found sex-specific differences in the proportional distribution of axonal collaterals, in action potential (AP) duration, and in transcript levels of Gad2, important for GABA synthesis. Drd2Pet1-CKO cells displayed sex-specific differences in the percentage of cells harboring Gad2 transcripts. Our results suggest that DRD2 function in Drd2-Pet1 neurons is required for normal defensive/protective behaviors in a sex-specific manner, which may be influenced by the identified sex-specific molecular and cellular features. Related behaviors in humans too show sex differences, suggesting translational relevance.
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Ge R, Dai Y. Three-Week Treadmill Exercise Enhances Persistent Inward Currents, Facilitates Dendritic Plasticity, and Upregulates the Excitability of Dorsal Raphe Serotonin Neurons in ePet-EYFP Mice. Front Cell Neurosci 2020; 14:575626. [PMID: 33177992 PMCID: PMC7595958 DOI: 10.3389/fncel.2020.575626] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 09/04/2020] [Indexed: 12/14/2022] Open
Abstract
Exercise plays a key role in preventing or treating mental or motor disorders caused by dysfunction of the serotonergic system. However, the electrophysiological and ionic channel mechanisms underlying these effects remain unclear. In this study, we investigated the effects of 3-week treadmill exercise on the electrophysiological and channel properties of dorsal raphe nucleus (DRN). Serotonin (5-HT) neurons in ePet-EYFP mice, using whole-cell patch clamp recording. Treadmill exercise was induced in ePet-EYFP mice of P21–24 for 3 weeks, and whole-cell patch clamp recording was performed on EYFP-positive 5-HT neurons from DRN slices of P42–45 mice. Experiment data showed that 5-HT neurons in the DRN were a heterogeneous population with multiple firing patterns (single firing, phasic firing, and tonic firing). Persistent inward currents (PICs) with multiple patterns were expressed in 5-HT neurons and composed of Cav1.3 (Ca-PIC) and sodium (Na-PIC) components. Exercise hyperpolarized the voltage threshold for action potential (AP) by 3.1 ± 1.0 mV (control: n = 14, exercise: n = 18, p = 0.005) and increased the AP amplitude by 6.7 ± 3.0 mV (p = 0.031) and firing frequency by more than 22% especially within a range of current stimulation stronger than 70 pA. A 3-week treadmill exercise was sufficient to hyperpolarize PIC onset by 2.6 ± 1.3 mV (control: −53.4 ± 4.7 mV, n = 28; exercise: −56.0 ± 4.7 mV, n = 25, p = 0.050) and increase the PIC amplitude by 28% (control: 193.6 ± 81.8 pA; exercise: 248.5 ± 105.4 pA, p = 0.038). Furthermore, exercise hyperpolarized Na-PIC onset by 3.8 ± 1.8 mV (control: n = 8, exercise: n = 9, p = 0.049) and increased the Ca-PIC amplitude by 23% (p = 0.013). The exercise-induced enhancement of the PIC amplitude was mainly mediated by Ca-PIC and hyperpolarization of PIC onset by Na-PIC. Moreover, exercise facilitated dendritic plasticity, which was shown as the increased number of branch points by 1.5 ± 0.5 (p = 0.009) and dendritic branches by 2.1 ± 0.6 (n = 20, p = 0.001) and length by 732.0 ± 100.1 μm (p < 0.001) especially within the range of 50–200 μm from the soma. Functional analysis suggested that treadmill exercise enhanced Na-PIC for facilitation of spike initiation and Ca-PIC for regulation of repetitive firing. We concluded that PICs broadly existed in DRN 5-HT neurons and could influence serotonergic neurotransmission in juvenile mice and that 3-week treadmill exercise induced synaptic adaptations, enhanced PICs, and thus upregulated the excitability of the 5-HT neurons.
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Affiliation(s)
- Renkai Ge
- Shanghai Key Laboratory of Multidimensional Information Processing, School of Communication and Electronic Engineering, East China Normal University, Shanghai, China.,School of Physical Education and Health Care, East China Jiaotong University, Nanchang, China
| | - Yue Dai
- Shanghai Key Laboratory of Multidimensional Information Processing, School of Communication and Electronic Engineering, East China Normal University, Shanghai, China.,Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, School of Physical Education and Health Care, East China Normal University, Shanghai, China
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Zahrai A, Vahid-Ansari F, Daigle M, Albert PR. Fluoxetine-induced recovery of serotonin and norepinephrine projections in a mouse model of post-stroke depression. Transl Psychiatry 2020; 10:334. [PMID: 32999279 PMCID: PMC7527452 DOI: 10.1038/s41398-020-01008-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 08/21/2020] [Accepted: 09/03/2020] [Indexed: 12/12/2022] Open
Abstract
Chronic treatment with fluoxetine (FLX) is required for its antidepressant effects, but the role of serotonin (5-HT) axonal plasticity in FLX action is unknown. To address this, we examined mice with a stroke in the left medial prefrontal cortex (mPFC) resulting in persistent anxiety-like and depression-like behaviors and memory deficits as a model of post-stroke depression. Chronic treatment with FLX (but not exercise) completely reversed the behavioral phenotype and partially reversed changes in FosB-labeled cells in the mPFC, nucleus accumbens, septum, hippocampus, basolateral amygdala (BLA), and dorsal raphe. In these regions, 5-HT or norepinephrine (NE) innervation was quantified by staining for 5-HT or NE transporters, respectively. 5-HT synapses and synaptic triads were identified as synaptophysin-stained sites on 5-HT axons located proximal to gephyrin-stained or PSD95-stained spines. A week after stroke, 5-HT innervation was greatly reduced at the stroke site (left cingulate gyrus (CG) of the mPFC) and the left BLA. Chronically, 5-HT and NE innervation was reduced at the left CG, nucleus accumbens, and BLA, with no changes in other regions. In these areas, pre-synaptic and post-synaptic 5-HT synapses and triads to inhibitory (gephyrin+) sites were reduced, while 5-HT contacts at excitatory (PSD95+) sites were reduced in the CG and prelimbic mPFC. Chronic FLX, but not exercise, reversed these reductions in 5-HT innervation but incompletely restored NE projections. Changes in 5-HT innervation were verified using YFP staining in mice expressing YFP-tagged channelrhodopsin in 5-HT neurons. Thus, FLX-induced 5-HT axonal neuroplasticity of forebrain projections may help mediate recovery from brain injury.
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Affiliation(s)
- Amin Zahrai
- grid.412687.e0000 0000 9606 5108Ottawa Hospital Research Institute (Neuroscience), UOttawa Brain and Mind Research Institute, 451 Smyth Road, Ottawa, ON K1H-8M5 Canada
| | - Faranak Vahid-Ansari
- grid.412687.e0000 0000 9606 5108Ottawa Hospital Research Institute (Neuroscience), UOttawa Brain and Mind Research Institute, 451 Smyth Road, Ottawa, ON K1H-8M5 Canada
| | - Mireille Daigle
- grid.412687.e0000 0000 9606 5108Ottawa Hospital Research Institute (Neuroscience), UOttawa Brain and Mind Research Institute, 451 Smyth Road, Ottawa, ON K1H-8M5 Canada
| | - Paul R. Albert
- grid.412687.e0000 0000 9606 5108Ottawa Hospital Research Institute (Neuroscience), UOttawa Brain and Mind Research Institute, 451 Smyth Road, Ottawa, ON K1H-8M5 Canada
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Avraam J, Wu Y, Richerson GB. Perinatal Nicotine Reduces Chemosensitivity of Medullary 5-HT Neurons after Maturation in Culture. Neuroscience 2020; 446:80-93. [PMID: 32818601 DOI: 10.1016/j.neuroscience.2020.08.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Revised: 08/07/2020] [Accepted: 08/10/2020] [Indexed: 01/19/2023]
Abstract
Perinatal exposure to nicotine produces ventilatory and chemoreflex deficits in neonatal mammals. Medullary 5-HT neurons are putative central chemoreceptors that innervate respiratory nuclei and promote ventilation, receive cholinergic input and express nicotinic acetylcholine receptors (nAChRs). Perforated patch clamp recordings were made from cultured 5-HT neurons dissociated from the medullary raphé of 0-3 day old mice expressing enhanced yellow fluorescent protein driven by the enhancer region for PET1 (ePet-EYFP). The effect of exposure to low (6 mg kg-1day-1) or high (60 mg kg-1day-1) doses of nicotine in utero (prenatal), in culture (postnatal), or both and the effect of acute nicotine exposure (10 μM), were examined on baseline firing rate (FR at 5% CO2, pH = 7.4) and the change in FR with acidosis (9% CO2, pH 7.2) in young (12-21 days in vitro, DIV) and older (≥22 DIV) acidosis stimulated 5-HT neurons. Nicotine exposed neurons exhibited ∼67% of the response to acidosis recorded in neurons given vehicle (p = 0.005), with older neurons exposed to high dose prenatal and postnatal nicotine, exhibiting only 28% of that recorded in the vehicle neurons (p < 0.01). In neurons exposed to low or high dose prenatal and postnatal nicotine, acute nicotine exposure led to a smaller increase in FR (∼+51% vs +168%, p = 0.026) and response to acidosis (+6% vs +67%, p = 0.014) compared to vehicle. These data show that exposure to nicotine during development reduces chemosensitivity of 5-HT neurons as they mature, an effect that may be related to the abnormal chemoreflexes reported in rodents exposed to nicotine in utero, and may cause a greater risk for sudden infant death syndrome (SIDS).
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Affiliation(s)
- Joanne Avraam
- Department of Neurology, University of Iowa, Iowa City, IA 52242, United States; Melbourne School of Psychological Sciences, University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Yuanming Wu
- Department of Neurology, University of Iowa, Iowa City, IA 52242, United States
| | - George Bradley Richerson
- Department of Neurology, University of Iowa, Iowa City, IA 52242, United States; Veteran's Affairs Medical Center, Iowa City, IA 52242, United States; Department of Molecular Physiology & Biophysics, University of Iowa, Iowa City, IA 52242, United States; Iowa Neuroscience Institute, University of Iowa, Iowa City, IA 52242, United States.
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Meng F, Liu J, Dai J, Wu M, Wang W, Liu C, Zhao D, Wang H, Zhang J, Li M, Li C. Brain-derived neurotrophic factor in 5-HT neurons regulates susceptibility to depression-related behaviors induced by subchronic unpredictable stress. J Psychiatr Res 2020; 126:55-66. [PMID: 32416387 DOI: 10.1016/j.jpsychires.2020.05.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 03/12/2020] [Accepted: 05/04/2020] [Indexed: 12/15/2022]
Abstract
Chronic stress is a major risk factor for the development of depression. Brain-derived neurotrophic factor (BDNF) plays an important role in neural functions and exhibits antidepressant effects. However, studies on depression-related behavioral response to BDNF have mainly focused on the limbic system, whereas other regions of the brain still require further exploration. Here, we report that exposure to chronic unpredictable stress (CUS) can induce depression-associated behaviors in mice. CUS could decrease total Bdnf mRNA and protein levels in the dorsal raphe nucleus (DRN), which correlated with depression-related behaviors. A corresponding reduction in exon-specific Bdnf mRNA was observed in the DRN of CUS mice. Bdnf was highly expressed in 5- Hydroxytryptamine (5-HT) neurons from the DRN. Selective deletion of Bdnf in 5-HT neurons alone could not induce anhedonia and behavioral despair in male or female mice, as indicated by the unchanged female urine sniffing time and preference for sucrose/saccharin. However, it could increase the latency to food in female mice, but not in male mice as shown by novelty-suppressed food test. Nevertheless, enhanced stress-induced susceptibility is observed in these male mice as suggested by the decrease in female urine sniffing time, and for female mice by the reduced sucrose preference and increased immobility in forced swim test. Furtherly, total Bdnf mRNA levels in DRN were correlated with depression-related behaviors of female, but not male 5-HT neurons specific Bdnf knockout mice. Our results indicate that BDNF might act on 5-HT neurons to regulate depression-related behaviors and stress vulnerability in a sex-dependent manner.
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Affiliation(s)
- Fantao Meng
- Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Jing Liu
- Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Juanjuan Dai
- Cancer Research Institute, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Min Wu
- Neurosurgery, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Wentao Wang
- Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Cuilan Liu
- Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Di Zhao
- Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Hongcai Wang
- Department of Neurology, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Jingyan Zhang
- Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Min Li
- Department of Neurology, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Chen Li
- Institute for Metabolic & Neuropsychiatric Disorders, Binzhou Medical University Hospital, Binzhou, Shandong, China.
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Azimi Z, Barzan R, Spoida K, Surdin T, Wollenweber P, Mark MD, Herlitze S, Jancke D. Separable gain control of ongoing and evoked activity in the visual cortex by serotonergic input. eLife 2020; 9:e53552. [PMID: 32252889 PMCID: PMC7138610 DOI: 10.7554/elife.53552] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Accepted: 03/04/2020] [Indexed: 01/25/2023] Open
Abstract
Controlling gain of cortical activity is essential to modulate weights between internal ongoing communication and external sensory drive. Here, we show that serotonergic input has separable suppressive effects on the gain of ongoing and evoked visual activity. We combined optogenetic stimulation of the dorsal raphe nucleus (DRN) with wide-field calcium imaging, extracellular recordings, and iontophoresis of serotonin (5-HT) receptor antagonists in the mouse visual cortex. 5-HT1A receptors promote divisive suppression of spontaneous activity, while 5-HT2A receptors act divisively on visual response gain and largely account for normalization of population responses over a range of visual contrasts in awake and anesthetized states. Thus, 5-HT input provides balanced but distinct suppressive effects on ongoing and evoked activity components across neuronal populations. Imbalanced 5-HT1A/2A activation, either through receptor-specific drug intake, genetically predisposed irregular 5-HT receptor density, or change in sensory bombardment may enhance internal broadcasts and reduce sensory drive and vice versa.
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Affiliation(s)
- Zohre Azimi
- Optical Imaging Group, Institut für Neuroinformatik, Ruhr University BochumBochumGermany
- International Graduate School of Neuroscience (IGSN), Ruhr University BochumBochumGermany
| | - Ruxandra Barzan
- Optical Imaging Group, Institut für Neuroinformatik, Ruhr University BochumBochumGermany
- International Graduate School of Neuroscience (IGSN), Ruhr University BochumBochumGermany
| | - Katharina Spoida
- Department of General Zoology and Neurobiology, Ruhr University BochumBochumGermany
| | - Tatjana Surdin
- Department of General Zoology and Neurobiology, Ruhr University BochumBochumGermany
| | - Patric Wollenweber
- Department of General Zoology and Neurobiology, Ruhr University BochumBochumGermany
| | - Melanie D Mark
- Department of General Zoology and Neurobiology, Ruhr University BochumBochumGermany
| | - Stefan Herlitze
- Department of General Zoology and Neurobiology, Ruhr University BochumBochumGermany
| | - Dirk Jancke
- Optical Imaging Group, Institut für Neuroinformatik, Ruhr University BochumBochumGermany
- International Graduate School of Neuroscience (IGSN), Ruhr University BochumBochumGermany
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Abstract
Neurons that synthesize and release 5-hydroxytryptamine (5-HT; serotonin) express a core set of genes that establish and maintain this neurotransmitter phenotype and distinguish these neurons from other brain cells. Beyond a shared 5-HTergic phenotype, these neurons display divergent cellular properties in relation to anatomy, morphology, hodology, electrophysiology and gene expression, including differential expression of molecules supporting co-transmission of additional neurotransmitters. This diversity suggests that functionally heterogeneous subtypes of 5-HT neurons exist, but linking subsets of these neurons to particular functions has been technically challenging. We discuss recent data from molecular genetic, genomic and functional methods that, when coupled with classical findings, yield a reframing of the 5-HT neuronal system as a conglomeration of diverse subsystems with potential to inspire novel, more targeted therapies for clinically distinct 5-HT-related disorders.
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5-HT neurons and central CO2 chemoreception. ACTA ACUST UNITED AC 2020. [DOI: 10.1016/b978-0-444-64125-0.00021-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Cheng Y, Zhang Q, Dai Y. Sequential activation of multiple persistent inward currents induces staircase currents in serotonergic neurons of medulla in ePet-EYFP mice. J Neurophysiol 2019; 123:277-288. [PMID: 31721638 DOI: 10.1152/jn.00623.2019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Persistent inward currents (PICs) are widely reported in rodent spinal neurons. A distinctive pattern observed recently is staircase-like PICs induced by voltage ramp in serotonergic neurons of mouse medulla. The mechanism underlying this pattern of PICs is unclear. Combining electrophysiological, pharmacological, and computational approaches, we investigated the staircase PICs in serotonergic neurons of medulla in ePet-EYFP transgenic mice (postnatal days 1-7). Staircase PICs induced by 10-s voltage biramps were observed in 70% of serotonergic neurons (n = 73). Staircase PICs activated at -48.8 ± 5 mV and consisted of two components, with the first PIC of 45.8 ± 51 pA and the second PIC of 197.3 ± 126 pA (n = 51). Staircase PICs were also composed of low-voltage-activated sodium PIC (Na-PIC; onset -46.2 ± 5 mV, n = 34), high-voltage-activated calcium PIC (Ca-PIC; onset -29.3 ± 6 mV, n = 23), and high-voltage-activated tetrodotoxin (TTX)- and dihydropyridine-resistant sodium PIC (TDR-PIC; onset -16.8 ± 4 mV, n = 28). Serotonergic neurons expressing Na-PIC, Ca-PIC, and TDR-PIC were evenly distributed in medulla. Bath application of 1-2 μM TTX blocked the first PIC and decreased the second PIC by 36% (n = 23, P < 0.05). Nimodipine (25 μM) reduced the second PIC by 38% (n = 34, P < 0.001) without altering the first PIC. TTX and nimodipine removed the first PIC and reduced the second PIC by 59% (n = 28, P < 0.01). A modeling study mimicked the staircase PICs and verified experimental conclusions that sequential activation of Na-PIC, Ca-PIC, and TDR-PIC in order of voltage thresholds induced staircase PICs in serotonergic neurons. Further experimental results suggested that the multiple components of staircase PICs play functional roles in regulating excitability of serotonergic neurons in medulla.NEW & NOTEWORTHY Staircase persistent inward currents (PICs) are mediated by activation of L-type calcium channels in dendrites of mouse spinal motoneurons. A novel mechanism is explored in this study. Here we report that the staircase PICs are mediated by sequentially activating sodium and calcium PICs in serotonergic neurons of mouse medulla.
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Affiliation(s)
- Yi Cheng
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, School of Physical Education and Health Care, East China Normal University, Shanghai, People's Republic of China
| | - Qiang Zhang
- Shanghai Key Laboratory of Multidimensional Information Processing, School of Communication and Electronic Engineering, East China Normal University, Shanghai, People's Republic of China
| | - Yue Dai
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, School of Physical Education and Health Care, East China Normal University, Shanghai, People's Republic of China.,Shanghai Key Laboratory of Multidimensional Information Processing, School of Communication and Electronic Engineering, East China Normal University, Shanghai, People's Republic of China
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Morphological and electrophysiological properties of serotonin neurons with NMDA modulation in the mesencephalic locomotor region of neonatal ePet-EYFP mice. Exp Brain Res 2019; 237:3333-3350. [PMID: 31720812 DOI: 10.1007/s00221-019-05675-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2018] [Accepted: 11/07/2019] [Indexed: 10/25/2022]
Abstract
The mesencephalic locomotor region (MLR) is an essential area for initiation of locomotion. Its functional roles and circuits underlying locomotion have been studied intensively in many species. Studies suggest that cuneiform nucleus and pedunculopontine nucleus (PPN) are two core regions in the MLR for locomotion. However, it remains unclear about cellular components and morphological and intrinsic membrane properties of the neurons in these regions, especially the serotonergic neurons. Using neonatal ePet-EYFP transgenic mice and immunofluorescent technique, we demonstrated existence of 5-HT neurons in the MLR and discovered that 5-HT neurons distributed mainly in the caudal PPN. 5-HT neurons were heterogeneous in MLR and had three types of firing pattern (single spike, phasic and tonic) and two subtypes of morphology (pyramidal and stellate). We measured parameters of 5-HT neurons (n = 35) including resting membrane potential (- 69.2 ± 4.2 mV), input resistance (1410.1 ± 616.9 MΩ), membrane capacitance (36.4 ± 14.9 pF), time constant (49.7 ± 19.4 ms), voltage threshold (- 32.1 ± 7.4 mV), rheobase (21.3 ± 12.4 pA), action potential amplitude (58.9 ± 12.8 mV) and half-width (4.7 ± 1.1 ms), afterhyperpolarization amplitude (23.6 ± 10.4 mV) and half-decay (331.6 ± 157.7 ms). 5-HT neurons were intrinsically different from adjacent non-5-HT neurons and less excitable than them. Hyperpolarization-activated inward currents and persistent inward currents were recorded in 5-HT neurons. NMDA increased excitability of 5-HT neurons, especially the tonic-firing neurons, accompanied with depolarization of membrane potential, hyperpolarization of voltage threshold, reduction of afterhyperpolarization half-decay, and left-shift of frequency-current relationship. This study provided insight into the distribution and properties of 5-HT neurons in the MLR and interaction between serotonergic and glutamatergic modulations.
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50
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Cardozo Pinto DF, Yang H, Pollak Dorocic I, de Jong JW, Han VJ, Peck JR, Zhu Y, Liu C, Beier KT, Smidt MP, Lammel S. Characterization of transgenic mouse models targeting neuromodulatory systems reveals organizational principles of the dorsal raphe. Nat Commun 2019; 10:4633. [PMID: 31604921 PMCID: PMC6789139 DOI: 10.1038/s41467-019-12392-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 09/09/2019] [Indexed: 11/17/2022] Open
Abstract
The dorsal raphe (DR) is a heterogeneous nucleus containing dopamine (DA), serotonin (5HT), γ-aminobutyric acid (GABA) and glutamate neurons. Consequently, investigations of DR circuitry require Cre-driver lines that restrict transgene expression to precisely defined cell populations. Here, we present a systematic evaluation of mouse lines targeting neuromodulatory cells in the DR. We find substantial differences in specificity between lines targeting DA neurons, and in penetrance between lines targeting 5HT neurons. Using these tools to map DR circuits, we show that populations of neurochemically distinct DR neurons are arranged in a stereotyped topographical pattern, send divergent projections to amygdala subnuclei, and differ in their presynaptic inputs. Importantly, targeting DR DA neurons using different mouse lines yielded both structural and functional differences in the neural circuits accessed. These results provide a refined model of DR organization and support a comparative, case-by-case evaluation of the suitability of transgenic tools for any experimental application.
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Affiliation(s)
- Daniel F Cardozo Pinto
- Department of Molecular and Cell Biology and Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, 94720, USA
- Nancy Pritzker Laboratory, Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Hongbin Yang
- Department of Molecular and Cell Biology and Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, 94720, USA
| | - Iskra Pollak Dorocic
- Department of Molecular and Cell Biology and Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, 94720, USA
| | - Johannes W de Jong
- Department of Molecular and Cell Biology and Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, 94720, USA
| | - Vivian J Han
- Department of Molecular and Cell Biology and Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, 94720, USA
| | - James R Peck
- Department of Molecular and Cell Biology and Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, 94720, USA
| | - Yichen Zhu
- Department of Molecular and Cell Biology and Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, 94720, USA
| | - Christine Liu
- Department of Molecular and Cell Biology and Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, 94720, USA
| | - Kevin T Beier
- Departments of Physiology and Biophysics, Center for the Neurobiology of Learning and Memory, University of California Irvine, Irvine, CA, 92697, USA
| | - Marten P Smidt
- Swammerdam Institute for Life Sciences, FNWI University of Amsterdam, Amsterdam, The Netherlands
| | - Stephan Lammel
- Department of Molecular and Cell Biology and Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, 94720, USA.
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