1
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Weber LM, Divecha HR, Tran MN, Kwon SH, Spangler A, Montgomery KD, Tippani M, Bharadwaj R, Kleinman JE, Page SC, Hyde TM, Collado-Torres L, Maynard KR, Martinowich K, Hicks SC. The gene expression landscape of the human locus coeruleus revealed by single-nucleus and spatially-resolved transcriptomics. eLife 2024; 12:RP84628. [PMID: 38266073 PMCID: PMC10945708 DOI: 10.7554/elife.84628] [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] [Indexed: 01/26/2024] Open
Abstract
Norepinephrine (NE) neurons in the locus coeruleus (LC) make long-range projections throughout the central nervous system, playing critical roles in arousal and mood, as well as various components of cognition including attention, learning, and memory. The LC-NE system is also implicated in multiple neurological and neuropsychiatric disorders. Importantly, LC-NE neurons are highly sensitive to degeneration in both Alzheimer's and Parkinson's disease. Despite the clinical importance of the brain region and the prominent role of LC-NE neurons in a variety of brain and behavioral functions, a detailed molecular characterization of the LC is lacking. Here, we used a combination of spatially-resolved transcriptomics and single-nucleus RNA-sequencing to characterize the molecular landscape of the LC region and the transcriptomic profile of LC-NE neurons in the human brain. We provide a freely accessible resource of these data in web-accessible and downloadable formats.
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Affiliation(s)
- Lukas M Weber
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public HealthBaltimoreUnited States
| | - Heena R Divecha
- Lieber Institute for Brain Development, Johns Hopkins Medical CampusBaltimoreUnited States
| | - Matthew N Tran
- Lieber Institute for Brain Development, Johns Hopkins Medical CampusBaltimoreUnited States
| | - Sang Ho Kwon
- Lieber Institute for Brain Development, Johns Hopkins Medical CampusBaltimoreUnited States
- Department of Neuroscience, Johns Hopkins School of MedicineBaltimoreUnited States
| | - Abby Spangler
- Lieber Institute for Brain Development, Johns Hopkins Medical CampusBaltimoreUnited States
| | - Kelsey D Montgomery
- Lieber Institute for Brain Development, Johns Hopkins Medical CampusBaltimoreUnited States
| | - Madhavi Tippani
- Lieber Institute for Brain Development, Johns Hopkins Medical CampusBaltimoreUnited States
| | - Rahul Bharadwaj
- Lieber Institute for Brain Development, Johns Hopkins Medical CampusBaltimoreUnited States
| | - Joel E Kleinman
- Lieber Institute for Brain Development, Johns Hopkins Medical CampusBaltimoreUnited States
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of MedicineBaltimoreUnited States
| | - Stephanie C Page
- Lieber Institute for Brain Development, Johns Hopkins Medical CampusBaltimoreUnited States
| | - Thomas M Hyde
- Lieber Institute for Brain Development, Johns Hopkins Medical CampusBaltimoreUnited States
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of MedicineBaltimoreUnited States
- Department of Neurology, Johns Hopkins School of MedicineBaltimoreUnited States
| | | | - Kristen R Maynard
- Lieber Institute for Brain Development, Johns Hopkins Medical CampusBaltimoreUnited States
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of MedicineBaltimoreUnited States
| | - Keri Martinowich
- Lieber Institute for Brain Development, Johns Hopkins Medical CampusBaltimoreUnited States
- Department of Neuroscience, Johns Hopkins School of MedicineBaltimoreUnited States
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of MedicineBaltimoreUnited States
- The Kavli Neuroscience Discovery Institute, Johns Hopkins UniversityBaltimoreUnited States
| | - Stephanie C Hicks
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public HealthBaltimoreUnited States
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2
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Altbürger C, Rath M, Wehrle J, Driever W. The proneural factors Ascl1a and Ascl1b contribute to the terminal differentiation of dopaminergic GABAergic dual transmitter neurons in zebrafish. Dev Biol 2024; 505:58-74. [PMID: 37931393 DOI: 10.1016/j.ydbio.2023.10.006] [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: 03/23/2023] [Revised: 10/06/2023] [Accepted: 10/23/2023] [Indexed: 11/08/2023]
Abstract
The proneural factor Ascl1 is involved in several steps of neurogenesis, from neural progenitor maintenance to initiation of terminal differentiation and neuronal subtype specification. In neural progenitor cells, Ascl1 initiates the cell-cycle exit of progenitors, and contributes to their differentiation into mainly GABAergic neurons. Several catecholaminergic neuron groups in the forebrain of zebrafish use GABA as co-transmitter, but a potential role of the two paralogues Ascl1a and Ascl1b in their neurogenesis is not understood. Here, we show that ascl1a, ascl1b double mutant embryos develop a significantly reduced number of neurons in all GABAergic and catecholaminergic dual transmitter neuron anatomical clusters in the fore- and hindbrain, while glutamatergic catecholaminergic clusters develop normally. However, none of the affected catecholaminergic cell clusters are lost completely, suggesting an impairment in progenitor pools, or a requirement of Ascl1a/b for differentiation of a subset of neurons in each cluster. Early progenitors which are dlx2a+, fezf2 + or emx2 + are not reduced whereas late progenitors and differentiating neurons marked by the expression of dlx5a, isl1 and arxa are severely reduced in ascl1a, ascl1b double mutant embryos. This suggests that Ascl1a and Ascl1b play only a minor or no role in the maintenance of their progenitor pools, but rather contribute to the initiation of terminal differentiation of GABAergic catecholaminergic neurons.
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Affiliation(s)
- Christian Altbürger
- Department of Developmental Biology, Faculty of Biology, Institute Biology 1, Albert Ludwigs University, Freiburg, Hauptstrasse 1, 79104, Freiburg, Germany; CIBSS and BIOSS - Centres for Biological Signalling Studies, University of Freiburg, Schänzlestrasse 18, 79104, Freiburg, Germany
| | - Meta Rath
- Department of Developmental Biology, Faculty of Biology, Institute Biology 1, Albert Ludwigs University, Freiburg, Hauptstrasse 1, 79104, Freiburg, Germany
| | - Johanna Wehrle
- Department of Developmental Biology, Faculty of Biology, Institute Biology 1, Albert Ludwigs University, Freiburg, Hauptstrasse 1, 79104, Freiburg, Germany; MeInBio Research Training Group, University of Freiburg, 79104, Freiburg, Germany
| | - Wolfgang Driever
- Department of Developmental Biology, Faculty of Biology, Institute Biology 1, Albert Ludwigs University, Freiburg, Hauptstrasse 1, 79104, Freiburg, Germany; CIBSS and BIOSS - Centres for Biological Signalling Studies, University of Freiburg, Schänzlestrasse 18, 79104, Freiburg, Germany.
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3
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Cardo LF, Monzón-Sandoval J, Li Z, Webber C, Li M. Single-Cell Transcriptomics and In Vitro Lineage Tracing Reveals Differential Susceptibility of Human iPSC-Derived Midbrain Dopaminergic Neurons in a Cellular Model of Parkinson's Disease. Cells 2023; 12:2860. [PMID: 38132179 PMCID: PMC10741976 DOI: 10.3390/cells12242860] [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: 11/09/2023] [Revised: 12/11/2023] [Accepted: 12/15/2023] [Indexed: 12/23/2023] Open
Abstract
Advances in stem cell technologies open up new avenues for modelling development and diseases. The success of these pursuits, however, relies on the use of cells most relevant to those targeted by the disease of interest, for example, midbrain dopaminergic neurons for Parkinson's disease. In the present study, we report the generation of a human induced pluripotent stem cell (iPSC) line capable of purifying and tracing nascent midbrain dopaminergic progenitors and their differentiated progeny via the expression of a Blue Fluorescent Protein (BFP). This was achieved by CRISPR/Cas9-assisted knock-in of BFP and Cre into the safe harbour locus AAVS1 and an early midbrain dopaminergic lineage marker gene LMX1A, respectively. Immunocytochemical analysis and single-cell RNA sequencing of iPSC-derived neural cultures confirm developmental recapitulation of the human fetal midbrain and high-quality midbrain cells. By modelling Parkinson's disease-related drug toxicity using 1-Methyl-4-phenylpyridinium (MPP+), we showed a preferential reduction of BFP+ cells, a finding demonstrated independently by cell death assays and single-cell transcriptomic analysis of MPP+ treated neural cultures. Together, these results highlight the importance of disease-relevant cell types in stem cell modelling.
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Affiliation(s)
- Lucia F. Cardo
- Dementia Research Institute, School of Medicine, Cardiff University, Hadyn Ellis Building, Maindy Road, Cardiff CF24 4HQ, UK; (L.F.C.); (J.M.-S.); (Z.L.)
| | - Jimena Monzón-Sandoval
- Dementia Research Institute, School of Medicine, Cardiff University, Hadyn Ellis Building, Maindy Road, Cardiff CF24 4HQ, UK; (L.F.C.); (J.M.-S.); (Z.L.)
| | - Zongze Li
- Dementia Research Institute, School of Medicine, Cardiff University, Hadyn Ellis Building, Maindy Road, Cardiff CF24 4HQ, UK; (L.F.C.); (J.M.-S.); (Z.L.)
- Neuroscience and Mental Health Innovation Institute, School of Medicine, Cardiff University, Hadyn Ellis Building, Maindy Road, Cardiff CF24 4HQ, UK
| | - Caleb Webber
- Dementia Research Institute, School of Medicine, Cardiff University, Hadyn Ellis Building, Maindy Road, Cardiff CF24 4HQ, UK; (L.F.C.); (J.M.-S.); (Z.L.)
| | - Meng Li
- Neuroscience and Mental Health Innovation Institute, School of Medicine, Cardiff University, Hadyn Ellis Building, Maindy Road, Cardiff CF24 4HQ, UK
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4
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Ye P, Fang Q, Hu X, Zou W, Huang M, Ke M, Li Y, Liu M, Cai X, Zhang C, Hua N, Al-Sheikh U, Liu X, Yu P, Jiang P, Pan PY, Luo J, Jiang LH, Xu S, Fang EF, Su H, Kang L, Yang W. TRPM2 as a conserved gatekeeper determines the vulnerability of DA neurons by mediating ROS sensing and calcium dyshomeostasis. Prog Neurobiol 2023; 231:102530. [PMID: 37739206 DOI: 10.1016/j.pneurobio.2023.102530] [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: 06/11/2023] [Revised: 09/01/2023] [Accepted: 09/17/2023] [Indexed: 09/24/2023]
Abstract
Different dopaminergic (DA) neuronal subgroups exhibit distinct vulnerability to stress, while the underlying mechanisms are elusive. Here we report that the transient receptor potential melastatin 2 (TRPM2) channel is preferentially expressed in vulnerable DA neuronal subgroups, which correlates positively with aging in Parkinson's Disease (PD) patients. Overexpression of human TRPM2 in the DA neurons of C. elegans resulted in selective death of ADE but not CEP neurons in aged worms. Mechanistically, TRPM2 activation mediates FZO-1/CED-9-dependent mitochondrial hyperfusion and mitochondrial permeability transition (MPT), leading to ADE death. In mice, TRPM2 knockout reduced vulnerable substantia nigra pars compacta (SNc) DA neuronal death induced by stress. Moreover, the TRPM2-mediated vulnerable DA neuronal death pathway is conserved from C. elegans to toxin-treated mice model and PD patient iPSC-derived DA neurons. The vulnerable SNc DA neuronal loss is the major symptom and cause of PD, and therefore the TRPM2-mediated pathway serves as a promising therapeutic target against PD.
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Affiliation(s)
- Peiwu Ye
- Department of Biophysics, Institute of Neuroscience, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Qiuyuan Fang
- Department of Biophysics, Institute of Neuroscience, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Xupang Hu
- Second Clinical Medical College, Affiliated Secondary Hospital, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310011, China
| | - Wenjuan Zou
- Department of Neurobiology and Department of Neurosurgery of the First Affiliated Hospital, Zhejiang University School of Medicine, Zhejiang 310053, China
| | - Miaodan Huang
- Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Minjing Ke
- Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Yunhao Li
- Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Min Liu
- Department of Biophysics, Institute of Neuroscience, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Xiaobo Cai
- Department of Biophysics, Institute of Neuroscience, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Congyi Zhang
- Department of Biophysics, Institute of Neuroscience, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Ning Hua
- Department of Biophysics, Institute of Neuroscience, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Umar Al-Sheikh
- Department of Neurobiology and Department of Neurosurgery of the First Affiliated Hospital, Zhejiang University School of Medicine, Zhejiang 310053, China
| | - Xingyu Liu
- Department of Biophysics, Institute of Neuroscience, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Peilin Yu
- Department of Toxicology, School of Public Health, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Peiran Jiang
- School of Brain Science and Brain Medicine, Zhejiang University, Hangzhou 310058, China
| | - Ping-Yue Pan
- Department of Neuroscience and Cell Biology, Rutgers University Robert Wood Johnson Medical School, 675 Hoes Lane, Piscataway, NJ 08854, USA
| | - Jianhong Luo
- School of Brain Science and Brain Medicine, Zhejiang University, Hangzhou 310058, China
| | - Lin-Hua Jiang
- School of Biomedical Sciences, University of Leeds, Leeds LS2 9JT, UK; Sino-UK Laboratory of Brain Function and Injury of Henan Province, Department of Physiology and Neurobiology, Xinxiang Medical University, Xinxiang 453000, China; University of Leeds, Leeds LS2 9JT, UK
| | - Suhong Xu
- Center for Stem Cell and Regenerative Medicine and Department of Cardiology of The Second Affiliated Hospital, Zhejiang University School of Medicine, 310058, Hangzhou, China
| | - Evandro F Fang
- Department of Clinical Molecular Biology, University of Oslo and Akershus University Hospital, Lørenskog, Norway
| | - Huanxing Su
- Institute of Chinese Medical Sciences, University of Macau, Macau, China.
| | - Lijun Kang
- Second Clinical Medical College, Affiliated Secondary Hospital, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310011, China; School of Brain Science and Brain Medicine, Zhejiang University, Hangzhou 310058, China.
| | - Wei Yang
- Department of Biophysics, Institute of Neuroscience, NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou 310058, China.
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5
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Kamath T, Macosko EZ. Insights into Neurodegeneration in Parkinson's Disease from Single-Cell and Spatial Genomics. Mov Disord 2023; 38:518-525. [PMID: 36881930 PMCID: PMC11056908 DOI: 10.1002/mds.29374] [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: 01/31/2023] [Revised: 02/12/2023] [Accepted: 02/16/2023] [Indexed: 03/09/2023] Open
Abstract
Parkinson's disease (PD) is pathologically defined by the death of dopaminergic (DA) neurons within the pars compacta of the substantia nigra. To date, the cause of this multifaceted disease remains largely unclear, which may contribute in part to a current lack of disease-modifying therapies. Recent advances in single-cell and spatial genomic profiling tools have provided powerful new ways to measure cellular state changes in brain diseases. Here, we describe how these tools have offered insight into these complex disorders and highlight a recently performed comprehensive study of DA neuron susceptibility in PD. The data generated by this recent work provide evidence for the role of specific pathways and common genetic variants resulting in the loss of a critical DA subtype in PD. We conclude by outlining a set of basic and translational opportunities that arise from those data and insights gathered from this work. © 2023 International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Tushar Kamath
- Stanley Center for Psychiatric Research, Broad Institute, 75 Ames Street Cambridge, MA 02139
- Harvard Medical School and Harvard/MIT MD-PhD Program, Harvard University, Cambridge, MA 02139 USA
| | - Evan Z. Macosko
- Stanley Center for Psychiatric Research, Broad Institute, 75 Ames Street Cambridge, MA 02139
- Massachusetts General Hospital, Department of Psychiatry, Boston, MA USA
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6
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Abstract
The midbrain dopamine (mDA) system is composed of molecularly and functionally distinct neuron subtypes that mediate specific behaviours and are linked to various brain diseases. Considerable progress has been made in identifying mDA neuron subtypes, and recent work has begun to unveil how these neuronal subtypes develop and organize into functional brain structures. This progress is important for further understanding the disparate physiological functions of mDA neurons and their selective vulnerability in disease, and will ultimately accelerate therapy development. This Review discusses recent advances in our understanding of molecularly defined mDA neuron subtypes and their circuits, ranging from early developmental events, such as neuron migration and axon guidance, to their wiring and function, and future implications for therapeutic strategies.
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7
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Godefroy D, Boukhzar L, Mallouki BY, Carpentier E, Dubessy C, Chigr F, Tillet Y, Anouar Y. SELENOT Deficiency in the Mouse Brain Impacts Catecholaminergic Neuron Density: An Immunohistochemical, in situ Hybridization and 3D Light-Sheet Imaging Study. Neuroendocrinology 2023; 113:193-207. [PMID: 35066506 DOI: 10.1159/000522091] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 01/11/2022] [Indexed: 11/19/2022]
Abstract
BACKGROUND Selenoprotein T (SELENOT), a PACAP-regulated thioredoxin-like protein, plays a role in catecholamine secretion and protects dopaminergic neurons. However, the role of SELENOT in the establishment of the catecholaminergic (CA) neuronal system is not known yet. METHODS We analyzed by immunohistochemistry and RNAscope in situ hybridization the distribution of SELENOT and the expression of its mRNA, respectively. In addition, 3D imaging involving immunostaining in toto, clearing through the iDISCO+ method, acquisitions by light-sheet microscopy, and processing of 3D images was performed to map the CA neuronal system. A semi-automatic quantification of 3D images was carried out. RESULTS SELENOT protein and mRNA are widely distributed in the mouse brain, with important local variations. Three-dimensional mapping, through tyrosine hydroxylase (TH) labeling, and semi-automated quantification of CA neurons in brain-specific SELENOT knockout mice showed a significant decrease in the number of TH-positive neurons in the area postrema (AP-A2), the A11 cell group (A11), and the zona incerta (ZI-A13) of SELENOT-deficient females, and in the hypothalamus (Hyp-A12-A14-A15) of SELENOT-deficient females and males. CONCLUSION These results showed that SELENOT is diffusely expressed in the mouse brain and that its deficiency impacts CA neuron distribution in different brain areas including Hyp-A12-A14-A15, in both male and female mice.
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Affiliation(s)
- David Godefroy
- UNIROUEN, INSERM U1239, Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Institute for Research and Innovation in Biomedicine (IRIB), Normandie Univsity, Rouen, France
| | - Loubna Boukhzar
- UNIROUEN, INSERM U1239, Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Institute for Research and Innovation in Biomedicine (IRIB), Normandie Univsity, Rouen, France
| | - Ben Yamine Mallouki
- UNIROUEN, INSERM U1239, Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Institute for Research and Innovation in Biomedicine (IRIB), Normandie Univsity, Rouen, France
| | - Emmanuelle Carpentier
- UNIROUEN, INSERM U1239, Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Institute for Research and Innovation in Biomedicine (IRIB), Normandie Univsity, Rouen, France
| | - Christophe Dubessy
- UNIROUEN, INSERM U1239, Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Institute for Research and Innovation in Biomedicine (IRIB), Normandie Univsity, Rouen, France
| | - Fatiha Chigr
- Bioengineering Laboratory, Faculty of Sciences and Techniques, Sultan Moulay Slimane University, Beni Mellal, Morocco
| | - Yves Tillet
- Physiologie de la Reproduction et des Comportements, UMR 085 INRAE, CNRS 7247, IFCE, Centre INRAE Val de Loire, Université de Tours, Nouzilly, France
| | - Youssef Anouar
- UNIROUEN, INSERM U1239, Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Institute for Research and Innovation in Biomedicine (IRIB), Normandie Univsity, Rouen, France
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8
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Gaertner Z, Azcorra M, Dombeck DA, Awatramani R. Molecular heterogeneity in the substantia nigra: A roadmap for understanding PD motor pathophysiology. Neurobiol Dis 2022; 175:105925. [DOI: 10.1016/j.nbd.2022.105925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 11/03/2022] [Accepted: 11/09/2022] [Indexed: 11/13/2022] Open
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9
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3D biocomposite culture enhances differentiation of dopamine-like neurons from SH-SY5Y cells: A model for studying Parkinson's disease phenotypes. Biomaterials 2022; 290:121858. [PMID: 36272218 DOI: 10.1016/j.biomaterials.2022.121858] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 09/30/2022] [Accepted: 10/09/2022] [Indexed: 01/01/2023]
Abstract
Studies of underlying neurodegenerative processes in Parkinson's Disease (PD) have traditionally utilized cell cultures grown on two-dimensional (2D) surfaces. Biomimetic three-dimensional (3D) cell culture platforms have been developed to better emulate features of the brain's natural microenvironment. We here use our bioengineered brain-like tissue model, composed of a silk-hydrogel composite, to study the 3D microenvironment's contributions on the development and performance of dopaminergic-like neurons (DLNs). Compared with 2D culture, SH-SY5Y cells differentiated in 3D microenvironments were enriched for DLNs concomitant with a reduction in proliferative capacity during the neurodevelopmental process. Additionally, the 3D DLN cultures were more sensitive to oxidative stresses elicited by the PD-related neurotoxin 1-methyl-4-phenylpyridinium (MPP). MPP induced transcriptomic profile changes specific to 3D-differentiated DLN cultures, replicating the dysfunction of neuronal signaling pathways and mitochondrial dynamics implicated in PD. Overall, this physiologically-relevant 3D platform resembles a useful tool for studying dopamine neuron biology and interrogating molecular mechanisms underlying neurodegeneration in PD.
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10
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Zhang X, Hu C, Huang C, Wei Y, Li X, Hu M, Li H, Wu J, Czajkowsky DM, Guo Y, Shao Z. Robust Acquisition of Spatial Transcriptional Programs in Tissues With Immunofluorescence-Guided Laser Capture Microdissection. Front Cell Dev Biol 2022; 10:853188. [PMID: 35399504 PMCID: PMC8990165 DOI: 10.3389/fcell.2022.853188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 02/24/2022] [Indexed: 12/22/2022] Open
Abstract
The functioning of tissues is fundamentally dependent upon not only the phenotypes of the constituent cells but also their spatial organization in the tissue, as local interactions precipitate intra-cellular events that often lead to changes in expression. However, our understanding of these processes in tissues, whether healthy or diseased, is limited at present owing to the difficulty in acquiring comprehensive transcriptional programs of spatially- and phenotypically-defined cells in situ. Here we present a robust method based on immunofluorescence-guided laser capture microdissection (immuno-LCM-RNAseq) to acquire finely resolved transcriptional programs with as few as tens of cells from snap-frozen or RNAlater-treated clinical tissues sufficient to resolve even isoforms. The protocol is optimized to protect the RNA with a small molecule inhibitor, the ribonucleoside vanadyl complex (RVC), which thereby enables the typical time-consuming immunostaining and laser capture steps of this procedure during which RNA is usually severely degraded in existing approaches. The efficacy of this approach is exemplified by the characterization of differentially expressed genes between the mouse small intestine lacteal cells at the tip versus the main capillary body, including those that function in sensing and responding to local environmental cues to stimulate intra-cellular signalling. With the extensive repertoire of specific antibodies that are presently available, our method provides an unprecedented capability for the analysis of transcriptional networks and signalling pathways during development, pathogenesis, and aging of specific cell types within native tissues.
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Affiliation(s)
- Xiaodan Zhang
- State Key Laboratory of Oncogenes and Related Genes, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Chuansheng Hu
- State Key Laboratory of Oncogenes and Related Genes, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Chen Huang
- Department of Gastrointestinal Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Ying Wei
- State Key Laboratory of Oncogenes and Related Genes, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Xiaowei Li
- State Key Laboratory of Oncogenes and Related Genes, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Miaomiao Hu
- State Key Laboratory of Oncogenes and Related Genes, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Hua Li
- State Key Laboratory of Oncogenes and Related Genes, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Ji Wu
- Bio-X Institute, Shanghai Jiao Tong University, Shanghai, China
| | - Daniel M. Czajkowsky
- State Key Laboratory of Oncogenes and Related Genes, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
- *Correspondence: Daniel M. Czajkowsky, ; Yan Guo, ; Zhifeng Shao,
| | - Yan Guo
- State Key Laboratory of Oncogenes and Related Genes, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
- *Correspondence: Daniel M. Czajkowsky, ; Yan Guo, ; Zhifeng Shao,
| | - Zhifeng Shao
- State Key Laboratory of Oncogenes and Related Genes, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
- *Correspondence: Daniel M. Czajkowsky, ; Yan Guo, ; Zhifeng Shao,
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11
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Aguila J, Cheng S, Kee N, Cao M, Wang M, Deng Q, Hedlund E. Spatial RNA Sequencing Identifies Robust Markers of Vulnerable and Resistant Human Midbrain Dopamine Neurons and Their Expression in Parkinson's Disease. Front Mol Neurosci 2021; 14:699562. [PMID: 34305528 PMCID: PMC8297217 DOI: 10.3389/fnmol.2021.699562] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 06/08/2021] [Indexed: 01/26/2023] Open
Abstract
Defining transcriptional profiles of substantia nigra pars compacta (SNc) and ventral tegmental area (VTA) dopamine neurons is critical to understanding their differential vulnerability in Parkinson’s Disease (PD). Here, we determine transcriptomes of human SNc and VTA dopamine neurons using LCM-seq on a large sample cohort. We apply a bootstrapping strategy as sample input to DESeq2 and identify 33 stably differentially expressed genes (DEGs) between these two subpopulations. We also compute a minimal sample size for identification of stable DEGs, which highlights why previous reported profiles from small sample sizes display extensive variability. Network analysis reveal gene interactions unique to each subpopulation and highlight differences in regulation of mitochondrial stability, apoptosis, neuronal survival, cytoskeleton regulation, extracellular matrix modulation as well as synapse integrity, which could explain the relative resilience of VTA dopamine neurons. Analysis of PD tissues showed that while identified stable DEGs can distinguish the subpopulations also in disease, the SNc markers SLIT1 and ATP2A3 were down-regulated and thus appears to be biomarkers of disease. In summary, our study identifies human SNc and VTA marker profiles, which will be instrumental for studies aiming to modulate dopamine neuron resilience and to validate cell identity of stem cell-derived dopamine neurons.
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Affiliation(s)
- Julio Aguila
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Shangli Cheng
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.,Center for Molecular Medicine, Karolinska University Hospital, Stockholm, Sweden
| | - Nigel Kee
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.,Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden.,Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - Ming Cao
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Menghan Wang
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.,Center for Molecular Medicine, Karolinska University Hospital, Stockholm, Sweden
| | - Qiaolin Deng
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.,Center for Molecular Medicine, Karolinska University Hospital, Stockholm, Sweden
| | - Eva Hedlund
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.,Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden.,Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
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12
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Fiorenzano A, Sozzi E, Parmar M, Storm P. Dopamine Neuron Diversity: Recent Advances and Current Challenges in Human Stem Cell Models and Single Cell Sequencing. Cells 2021; 10:cells10061366. [PMID: 34206038 PMCID: PMC8226961 DOI: 10.3390/cells10061366] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 05/28/2021] [Accepted: 05/29/2021] [Indexed: 12/12/2022] Open
Abstract
Human midbrain dopamine (DA) neurons are a heterogeneous group of cells that share a common neurotransmitter phenotype and are in close anatomical proximity but display different functions, sensitivity to degeneration, and axonal innervation targets. The A9 DA neuron subtype controls motor function and is primarily degenerated in Parkinson’s disease (PD), whereas A10 neurons are largely unaffected by the condition, and their dysfunction is associated with neuropsychiatric disorders. Currently, DA neurons can only be reliably classified on the basis of topographical features, including anatomical location in the midbrain and projection targets in the forebrain. No systematic molecular classification at the genome-wide level has been proposed to date. Although many years of scientific efforts in embryonic and adult mouse brain have positioned us to better understand the complexity of DA neuron biology, many biological phenomena specific to humans are not amenable to being reproduced in animal models. The establishment of human cell-based systems combined with advanced computational single-cell transcriptomics holds great promise for decoding the mechanisms underlying maturation and diversification of human DA neurons, and linking their molecular heterogeneity to functions in the midbrain. Human pluripotent stem cells have emerged as a useful tool to recapitulate key molecular features of mature DA neuron subtypes. Here, we review some of the most recent advances and discuss the current challenges in using stem cells, to model human DA biology. We also describe how single cell RNA sequencing may provide key insights into the molecular programs driving DA progenitor specification into mature DA neuron subtypes. Exploiting the state-of-the-art approaches will lead to a better understanding of stem cell-derived DA neurons and their use in disease modeling and regenerative medicine.
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13
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Jakobsson JET, Spjuth O, Lagerström MC. scConnect: a method for exploratory analysis of cell-cell communication based on single cell RNA sequencing data. Bioinformatics 2021; 37:3501-3508. [PMID: 33974001 PMCID: PMC8545319 DOI: 10.1093/bioinformatics/btab245] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 02/18/2021] [Accepted: 04/14/2021] [Indexed: 12/25/2022] Open
Abstract
Motivation Cell to cell communication is critical for all multicellular organisms, and single-cell sequencing facilitates the construction of full connectivity graphs between cell types in tissues. Such complex data structures demand novel analysis methods and tools for exploratory analysis. Results We propose a method to predict the putative ligand–receptor interactions between cell types from single-cell RNA-sequencing data. This is achieved by inferring and incorporating interactions in a multi-directional graph, thereby enabling contextual exploratory analysis. We demonstrate that our approach can detect common and specific interactions between cell types in mouse brain and human tumors, and that these interactions fit with expected outcomes. These interactions also include predictions made with molecular ligands integrating information from several types of genes necessary for ligand production and transport. Our implementation is general and can be appended to any transcriptome analysis pipeline to provide unbiased hypothesis generation regarding ligand to receptor interactions between cell populations or for network analysis in silico. Availability and implementation scConnect is open source and available as a Python package at https://github.com/JonETJakobsson/scConnect. scConnect is directly compatible with Scanpy scRNA-sequencing pipelines. Supplementary information Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- Jon E T Jakobsson
- Department of Neuroscience, Uppsala University, 751 24 Uppsala, Sweden
| | - Ola Spjuth
- Department of Pharmaceutical Biosciences, Uppsala University, 751 24 Uppsala, Sweden
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14
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Single-Cell Technologies in Parkinson׳s Disease. SYSTEMS MEDICINE 2021. [DOI: 10.1016/b978-0-12-801238-3.11613-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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15
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Monzón-Sandoval J, Poggiolini I, Ilmer T, Wade-Martins R, Webber C, Parkkinen L. Human-Specific Transcriptome of Ventral and Dorsal Midbrain Dopamine Neurons. Ann Neurol 2020; 87:853-868. [PMID: 32167609 PMCID: PMC8651008 DOI: 10.1002/ana.25719] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 03/11/2020] [Accepted: 03/11/2020] [Indexed: 02/01/2023]
Abstract
Objective Neuronal loss in the substantia nigra pars compacta (SNpc) in Parkinson disease (PD) is not uniform, as dopamine neurons from the ventral tier are lost more rapidly than those of the dorsal tier. Identifying the intrinsic differences that account for this differential vulnerability may provide a key for developing new treatments for PD. Methods Here, we compared the RNA‐sequenced transcriptomes of ~100 laser captured microdissected SNpc neurons from each tier from 7 healthy controls. Results Expression levels of dopaminergic markers were similar across the tiers, whereas markers specific to the neighboring ventral tegmental area were virtually undetected. After accounting for unwanted sources of variation, we identified 106 differentially expressed genes (DEGs) between the SNpc tiers. The genes higher in the dorsal/resistant SNpc tier neurons displayed coordinated patterns of expression across the human brain, their protein products had more interactions than expected by chance, and they demonstrated evidence of functional convergence. No significant shared functionality was found for genes higher in the ventral/vulnerable SNpc tier. Surprisingly but importantly, none of the identified DEGs was among the familial PD genes or genome‐wide associated loci. Finally, we found some DEGs in opposite tier orientation between human and analogous mouse populations. Interpretation Our results highlight functional enrichments of vesicular trafficking, ion transport/homeostasis and oxidative stress genes showing higher expression in the resistant neurons of the SNpc dorsal tier. Furthermore, the comparison of gene expression variation in human and mouse SNpc populations strongly argues for the need of human‐focused omics studies. ANN NEUROL 2020;87:853–868
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Affiliation(s)
- Jimena Monzón-Sandoval
- Oxford Parkinson's Disease Centre, University of Oxford, Oxford.,UK Dementia Research Institute, Cardiff University, Cardiff
| | - Ilaria Poggiolini
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford
| | - Tobias Ilmer
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford
| | - Richard Wade-Martins
- Oxford Parkinson's Disease Centre, University of Oxford, Oxford.,Department of Physiology Anatomy and Genetics, University of Oxford, Oxford, United Kingdom
| | - Caleb Webber
- Oxford Parkinson's Disease Centre, University of Oxford, Oxford.,UK Dementia Research Institute, Cardiff University, Cardiff.,Department of Physiology Anatomy and Genetics, University of Oxford, Oxford, United Kingdom
| | - Laura Parkkinen
- Oxford Parkinson's Disease Centre, University of Oxford, Oxford.,Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford
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16
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Poulin JF, Gaertner Z, Moreno-Ramos OA, Awatramani R. Classification of Midbrain Dopamine Neurons Using Single-Cell Gene Expression Profiling Approaches. Trends Neurosci 2020; 43:155-169. [PMID: 32101709 PMCID: PMC7285906 DOI: 10.1016/j.tins.2020.01.004] [Citation(s) in RCA: 118] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 12/13/2019] [Accepted: 01/11/2020] [Indexed: 01/31/2023]
Abstract
Dysfunctional dopamine (DA) signaling has been associated with a broad spectrum of neuropsychiatric disorders, prompting investigations into how midbrain DA neuron heterogeneity may underpin this variety of behavioral symptoms. Emerging literature indeed points to functional heterogeneity even within anatomically defined DA clusters. Recognizing the need for a systematic classification scheme, several groups have used single-cell profiling to catalog DA neurons based on their gene expression profiles. We aim here not only to synthesize points of congruence but also to highlight key differences between the molecular classification schemes derived from these studies. In doing so, we hope to provide a common framework that will facilitate investigations into the functions of DA neuron subtypes in the healthy and diseased brain.
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Affiliation(s)
- Jean-Francois Poulin
- Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC, Canada
| | - Zachary Gaertner
- Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | | | - Rajeshwar Awatramani
- Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.
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17
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Loss of fragile X mental retardation protein precedes Lewy pathology in Parkinson's disease. Acta Neuropathol 2020; 139:319-345. [PMID: 31768670 DOI: 10.1007/s00401-019-02099-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 11/10/2019] [Accepted: 11/11/2019] [Indexed: 12/11/2022]
Abstract
Parkinson's disease (PD) is the most common neurodegenerative movement disorder and is characterized by the progressive loss of dopaminergic (DA) neurons in the substantia nigra pars compacta (SNc) and the gradual appearance of α-synuclein (α-syn)-containing neuronal protein aggregates. Although the exact mechanism of α-syn-mediated cell death remains elusive, recent research suggests that α-syn-induced alterations in neuronal excitability contribute to cell death in PD. Because the fragile X mental retardation protein (FMRP) controls the expression and function of numerous neuronal genes related to neuronal excitability and synaptic function, we here investigated the role of FMRP in α-syn-associated pathological changes in cell culture and mouse models of PD as well as in post-mortem human brain tissue from PD patients. We found FMRP to be decreased in cultured DA neurons and in the mouse brain in response to α-syn overexpression. FMRP was, furthermore, lost in the SNc of PD patients and in patients with early stages of incidental Lewy body disease (iLBD). Unlike fragile X syndrome (FXS), FMR1 expression in response to α-syn was regulated by a mechanism involving Protein Kinase C (PKC) and cAMP response element-binding protein (CREB). Reminiscent of FXS neurons, α-syn-overexpressing cells exhibited an increase in membrane N-type calcium channels, increased phosphorylation of ERK1/2, eIF4E and S6, increased overall protein synthesis, and increased expression of Matrix Metalloproteinase 9 (MMP9). FMRP affected neuronal function in a PD animal model, because FMRP-KO mice were resistant to the effect of α-syn on striatal dopamine release. In summary, our results thus reveal a new role of FMRP in PD and support the examination of FMRP-regulated genes in PD disease progression.
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18
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André N, Audiffren M, Baumeister RF. An Integrative Model of Effortful Control. Front Syst Neurosci 2019; 13:79. [PMID: 31920573 PMCID: PMC6933500 DOI: 10.3389/fnsys.2019.00079] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 12/06/2019] [Indexed: 11/21/2022] Open
Abstract
This article presents an integrative model of effortful control, a resource-limited top-down control mechanism involved in mental tasks and physical exercises. Based on recent findings in the fields of neuroscience, social psychology and cognitive psychology, this model posits the intrinsic costs related to a weakening of the connectivity of neural networks underpinning effortful control as the main cause of mental fatigue in long and high-demanding tasks. In this framework, effort reflects three different inter-related aspects of the same construct. First, effort is a mechanism comprising a limited number of interconnected processing units that integrate information regarding the task constraints and subject’s state. Second, effort is the main output of this mechanism, namely, the effort signal that modulates neuronal activity in brain regions involved in the current task to select pertinent information. Third, effort is a feeling that emerges in awareness during effortful tasks and reflects the costs associated with goal-directed behavior. Finally, the model opens new avenues for research investigating effortful control at the behavioral and neurophysiological levels.
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Affiliation(s)
- Nathalie André
- Research Centre on Cognition and Learning, UMR CNRS 7295, University of Poitiers, Poitiers, France
| | - Michel Audiffren
- Research Centre on Cognition and Learning, UMR CNRS 7295, University of Poitiers, Poitiers, France
| | - Roy F Baumeister
- School of Psychology, University of Queensland, Brisbane, QLD, Australia
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19
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Copper and the brain noradrenergic system. J Biol Inorg Chem 2019; 24:1179-1188. [PMID: 31691104 DOI: 10.1007/s00775-019-01737-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Accepted: 10/21/2019] [Indexed: 02/08/2023]
Abstract
Copper (Cu) plays an essential role in the development and function of the brain. In humans, genetic disorders of Cu metabolism may cause either severe Cu deficiency (Menkes disease) or excessive Cu accumulation (Wilson disease) in the brain tissue. In either case, the loss of Cu homeostasis results in catecholamine misbalance, abnormal myelination of neurons, loss of normal brain architecture, and a spectrum of neurologic and/or psychiatric manifestations. Several metabolic processes have been identified as particularly sensitive to Cu dis-homeostasis. This review focuses on the role of Cu in noradrenergic neurons and summarizes the current knowledge of mechanisms that maintain Cu homeostasis in these cells. The impact of Cu misbalance on catecholamine metabolism and functioning of noradrenergic system is discussed.
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20
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Brimblecombe KR, Vietti-Michelina S, Platt NJ, Kastli R, Hnieno A, Gracie CJ, Cragg SJ. Calbindin-D28K Limits Dopamine Release in Ventral but Not Dorsal Striatum by Regulating Ca 2+ Availability and Dopamine Transporter Function. ACS Chem Neurosci 2019; 10:3419-3426. [PMID: 31361457 PMCID: PMC6706870 DOI: 10.1021/acschemneuro.9b00325] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
![]()
The
calcium-binding protein calbindin-D28K, or calb1, is expressed
at higher levels by dopamine (DA) neurons originating in the ventral
tegmental area (VTA) than in the adjacent substantia nigra pars compacta
(SNc). Calb1 has received attention for a potential role in neuroprotection
in Parkinson’s disease. The underlying physiological roles
for calb1 are incompletely understood. We used cre-loxP technology
to knock down calb1 in mouse DA neurons to test whether calb1 governs
axonal release of DA in the striatum, detected using fast-scan cyclic
voltammetry ex vivo. In the ventral but not dorsal striatum, calb1
knockdown elevated DA release and modified the spatiotemporal coupling
of Ca2+ entry to DA release. Furthermore, calb1 knockdown
enhanced DA uptake but attenuated the impact of DA transporter (DAT)
inhibition by cocaine on underlying DA release. These data reveal
that calb1 acts through a range of mechanisms underpinning both DA
release and uptake to limit DA transmission in the ventral but not
dorsal striatum.
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Affiliation(s)
- Katherine R. Brimblecombe
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3PT, United Kingdom
- Oxford Parkinson’s Disease Centre, University of Oxford, Oxford OX1 3PT, United Kingdom
| | - Stefania Vietti-Michelina
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3PT, United Kingdom
| | - Nicola J. Platt
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3PT, United Kingdom
| | - Rahel Kastli
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3PT, United Kingdom
| | - Ahmad Hnieno
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3PT, United Kingdom
| | - Caitlin J. Gracie
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3PT, United Kingdom
| | - Stephanie J. Cragg
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3PT, United Kingdom
- Oxford Parkinson’s Disease Centre, University of Oxford, Oxford OX1 3PT, United Kingdom
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21
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Total Polysaccharides of Lily Bulb Ameliorate Menopause-Like Behavior in Ovariectomized Mice: Multiple Mechanisms Distinct from Estrogen Therapy. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:6869350. [PMID: 31428228 PMCID: PMC6683782 DOI: 10.1155/2019/6869350] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 06/21/2019] [Accepted: 06/27/2019] [Indexed: 12/28/2022]
Abstract
Our previous study has demonstrated the effects of aqueous extract of lily bulb in alleviating menopause-related psychiatric symptoms in ovariectomized (OVX) mice. This study sought to further investigate the psychotropic effects of total polysaccharides of lily bulb (TPLB) against anxiety, depression, and cognitive deterioration and the underlying mechanisms in OVX mice using behavioral, neurochemical, molecular, and proteomic approaches in comparison with estrogen therapy. While TPLB and estradiol showed similar effects in reducing OVX-induced anxiety, depression, and cognitive impairment, the psychotropic effects of TPLB were more closely associated with the predominant activation of estrogen receptors (ERs) and regulation of brain regional neurotransmitters and neurotrophins with minor effects on the uterus. Estradiol had similar potencies in binding affinity at ERα and ERβ, which caused widespread genetic and epigenetic effects. In contrast, TPLB displayed a higher affinity at ERβ than ERα, triggering the specific Ras/Akt/ERK/CREB signaling pathway without affecting any epigenetic activity. TPLB additionally modulated multiple proteins associated with mitochondrial oxidative stress, but estradiol did not. These results indicate that TPLB has comparable efficacy in reducing menopause-associated neuropsychological symptoms with a better safety profile compared to estrogen therapy. We suggest that TPLB could serve as a novel agent for menopause syndrome.
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22
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Watabe-Uchida M, Uchida N. Multiple Dopamine Systems: Weal and Woe of Dopamine. COLD SPRING HARBOR SYMPOSIA ON QUANTITATIVE BIOLOGY 2019; 83:83-95. [PMID: 30787046 DOI: 10.1101/sqb.2018.83.037648] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The ability to predict future outcomes increases the fitness of the animal. Decades of research have shown that dopamine neurons broadcast reward prediction error (RPE) signals-the discrepancy between actual and predicted reward-to drive learning to predict future outcomes. Recent studies have begun to show, however, that dopamine neurons are more diverse than previously thought. In this review, we will summarize a series of our studies that have shown unique properties of dopamine neurons projecting to the posterior "tail" of the striatum (TS) in terms of anatomy, activity, and function. Specifically, TS-projecting dopamine neurons are activated by a subset of negative events including threats from a novel object, send prediction errors for external threats, and reinforce avoidance behaviors. These results indicate that there are at least two axes of dopamine-mediated reinforcement learning in the brain-one learning from canonical RPEs and another learning from threat prediction errors. We argue that the existence of multiple learning systems is an adaptive strategy that makes possible each system optimized for its own needs. The compartmental organization in the mammalian striatum resembles that of a dopamine-recipient area in insects (mushroom body), pointing to a principle of dopamine function conserved across phyla.
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Affiliation(s)
- Mitsuko Watabe-Uchida
- Center for Brain Science, Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Naoshige Uchida
- Center for Brain Science, Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA
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23
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Kang SS, Ahn EH, Zhang Z, Liu X, Manfredsson FP, Sandoval IM, Dhakal S, Iuvone PM, Cao X, Ye K. α-Synuclein stimulation of monoamine oxidase-B and legumain protease mediates the pathology of Parkinson's disease. EMBO J 2018; 37:embj.201798878. [PMID: 29769405 DOI: 10.15252/embj.201798878] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 04/01/2018] [Accepted: 04/09/2018] [Indexed: 12/31/2022] Open
Abstract
Dopaminergic neurodegeneration in Parkinson's disease (PD) is associated with abnormal dopamine metabolism by MAO-B (monoamine oxidase-B) and intracellular α-Synuclein (α-Syn) aggregates, called the Lewy body. However, the molecular relationship between α-Syn and MAO-B remains unclear. Here, we show that α-Syn directly binds to MAO-B and stimulates its enzymatic activity, which triggers AEP (asparagine endopeptidase; legumain) activation and subsequent α-Syn cleavage at N103, leading to dopaminergic neurodegeneration. Interestingly, the dopamine metabolite, DOPAL, strongly activates AEP, and the N103 fragment of α-Syn binds and activates MAO-B. Accordingly, overexpression of AEP in SNCA transgenic mice elicits α-Syn N103 cleavage and accelerates PD pathogenesis, and inhibition of MAO-B by Rasagiline diminishes α-Syn-mediated PD pathology and motor dysfunction. Moreover, virally mediated expression of α-Syn N103 induces PD pathogenesis in wild-type, but not MAO-B-null mice. Our findings thus support that AEP-mediated cleavage of α-Syn at N103 is required for the association and activation of MAO-B, mediating PD pathogenesis.
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Affiliation(s)
- Seong Su Kang
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Eun Hee Ahn
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Zhentao Zhang
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA, USA.,Department of Neurology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Xia Liu
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Fredric P Manfredsson
- Translational Science and Molecular Medicine, College of Human Medicine, Michigan State University, Grand Rapids, MI, USA
| | - Ivette M Sandoval
- Translational Science and Molecular Medicine, College of Human Medicine, Michigan State University, Grand Rapids, MI, USA
| | - Susov Dhakal
- Department of Ophthalmology and Pharmacology, Emory University School of Medicine, Atlanta, GA, USA
| | - P Michael Iuvone
- Department of Ophthalmology and Pharmacology, Emory University School of Medicine, Atlanta, GA, USA
| | - Xuebing Cao
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Keqiang Ye
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA, USA .,Translational Center for Stem Cell Research, Department of Regenerative Medicine, Tongji Hospital, Tongji University School of Medicine, Shanghai, China
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24
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Kramer DJ, Risso D, Kosillo P, Ngai J, Bateup HS. Combinatorial Expression of Grp and Neurod6 Defines Dopamine Neuron Populations with Distinct Projection Patterns and Disease Vulnerability. eNeuro 2018; 5:ENEURO.0152-18.2018. [PMID: 30135866 PMCID: PMC6104179 DOI: 10.1523/eneuro.0152-18.2018] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 05/14/2018] [Indexed: 12/15/2022] Open
Abstract
Midbrain dopamine neurons project to numerous targets throughout the brain to modulate various behaviors and brain states. Within this small population of neurons exists significant heterogeneity based on physiology, circuitry, and disease susceptibility. Recent studies have shown that dopamine neurons can be subdivided based on gene expression; however, the extent to which genetic markers represent functionally relevant dopaminergic subpopulations has not been fully explored. Here we performed single-cell RNA-sequencing of mouse dopamine neurons and validated studies showing that Neurod6 and Grp are selective markers for dopaminergic subpopulations. Using a combination of multiplex fluorescent in situ hybridization, retrograde labeling, and electrophysiology in mice of both sexes, we defined the anatomy, projection targets, physiological properties, and disease vulnerability of dopamine neurons based on Grp and/or Neurod6 expression. We found that the combinatorial expression of Grp and Neurod6 defines dopaminergic subpopulations with unique features. Grp+/Neurod6+ dopamine neurons reside in the ventromedial VTA, send projections to the medial shell of the nucleus accumbens, and have noncanonical physiological properties. Grp+/Neurod6- dopamine neurons are found in the VTA as well as in the ventromedial portion of the SNc, where they project selectively to the dorsomedial striatum. Grp-/Neurod6+ dopamine neurons represent a smaller VTA subpopulation, which is preferentially spared in a 6-OHDA model of Parkinson's disease. Together, our work provides detailed characterization of Neurod6 and Grp expression in the midbrain and generates new insights into how these markers define functionally relevant dopaminergic subpopulations.
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Affiliation(s)
- Daniel J. Kramer
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720
| | - Davide Risso
- Division of Biostatistics and Epidemiology, Department of Healthcare Policy and Research, Weill Cornell Medicine, New York, NY 10065
| | - Polina Kosillo
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720
| | - John Ngai
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720
- Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, CA 94720
| | - Helen S. Bateup
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720
- Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, CA 94720
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25
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Hryhorczuk C, Sheng Z, Décarie-Spain L, Giguère N, Ducrot C, Trudeau LÉ, Routh VH, Alquier T, Fulton S. Oleic Acid in the Ventral Tegmental Area Inhibits Feeding, Food Reward, and Dopamine Tone. Neuropsychopharmacology 2018; 43:607-616. [PMID: 28857071 PMCID: PMC5770761 DOI: 10.1038/npp.2017.203] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 08/23/2017] [Accepted: 08/28/2017] [Indexed: 12/16/2022]
Abstract
Long-chain fatty acids (FAs) act centrally to decrease food intake and hepatic glucose production and alter hypothalamic neuronal activity in a manner that depends on FA type and cellular transport proteins. However, it is not known whether FAs are sensed by ventral tegmental area (VTA) dopamine (DA) neurons to control food-motivated behavior and DA neurotransmission. We investigated the impact of the monounsaturated FA oleate in the VTA on feeding, locomotion, food reward, and DA neuronal activity and DA neuron expression of FA-handling proteins and FA uptake. A single intra-VTA injection of oleate, but not of the saturated FA palmitate, decreased food intake and increased locomotor activity. Furthermore, intra-VTA oleate blunted the rewarding effects of high-fat/sugar food in an operant task and inhibited DA neuronal firing. Using sorted DA neuron preparations from TH-eGFP mice we found that DA neurons express FA transporter and binding proteins, and are capable of intracellular transport of long-chain FA. Finally, we demonstrate that a transporter blocker attenuates FA uptake into DA neurons and blocks the effects of intra-VTA oleate to decrease food-seeking and DA neuronal activity. Together, these results suggest that DA neurons detect FA and that oleate has actions in the VTA to suppress DA neuronal activity and food seeking following cellular incorporation. These findings highlight the capacity of DA neurons to act as metabolic sensors by responding not only to hormones but also to FA nutrient signals to modulate food-directed behavior.
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Affiliation(s)
- Cecile Hryhorczuk
- CRCHUM and Montreal Diabetes Research Center, Montréal, QC, Canada
- Department of Physiology, Université de Montréal, Montréal, QC, Canada
| | - Zhenyu Sheng
- Rutgers New Jersey Medical School, Department of Pharmacology, Physiology and Neuroscience, Rutgers University, Newark, NJ, USA
| | - Léa Décarie-Spain
- CRCHUM and Montreal Diabetes Research Center, Montréal, QC, Canada
- Department of Neurosciences, Université de Montréal, Montréal, QC, Canada
| | - Nicolas Giguère
- Department of Pharmacology, Université de Montréal, Montréal, QC, Canada
| | - Charles Ducrot
- Department of Pharmacology, Université de Montréal, Montréal, QC, Canada
| | - Louis-Éric Trudeau
- Department of Pharmacology, Université de Montréal, Montréal, QC, Canada
| | - Vanessa H Routh
- Rutgers New Jersey Medical School, Department of Pharmacology, Physiology and Neuroscience, Rutgers University, Newark, NJ, USA
| | - Thierry Alquier
- CRCHUM and Montreal Diabetes Research Center, Montréal, QC, Canada
- Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Stephanie Fulton
- CRCHUM and Montreal Diabetes Research Center, Montréal, QC, Canada
- Department of Nutrition, Université de Montréal, Montréal, QC, Canada
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26
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Rizzi G, Tan KR. Dopamine and Acetylcholine, a Circuit Point of View in Parkinson's Disease. Front Neural Circuits 2017; 11:110. [PMID: 29311846 PMCID: PMC5744635 DOI: 10.3389/fncir.2017.00110] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 12/14/2017] [Indexed: 12/30/2022] Open
Abstract
Data from the World Health Organization (National Institute on Aging, 2011) and the National Institutes of Health (He et al., 2016) predicts that while today the worldwide population over 65 years of age is estimated around 8.5%, this number will reach an astounding 17% by 2050. In this framework, solving current neurodegenerative diseases primarily associated with aging becomes more pressing than ever. In 2017, we celebrate a grim 200th anniversary since the very first description of Parkinson’s disease (PD) and its related symptomatology. Two centuries after this debilitating disease was first identified, finding a cure remains a hopeful goal rather than an attainable objective on the horizon. Tireless work has provided insight into the characterization and progression of the disease down to a molecular level. We now know that the main motor deficits associated with PD arise from the almost total loss of dopaminergic cells in the substantia nigra pars compacta. A concomitant loss of cholinergic cells entails a cognitive decline in these patients, and current therapies are only partially effective, often inducing side-effects after a prolonged treatment. This review covers some of the recent developments in the field of Basal Ganglia (BG) function in physiology and pathology, with a particular focus on the two main neuromodulatory systems known to be severely affected in PD, highlighting some of the remaining open question from three main stand points: - Heterogeneity of midbrain dopamine neurons. - Pairing of dopamine (DA) sub-circuits. - Dopamine-Acetylcholine (ACh) interaction. A vast amount of knowledge has been accumulated over the years from experimental conditions, but very little of it is reflected or used at a translational or clinical level. An initiative to implement the knowledge that is emerging from circuit-based approaches to tackle neurodegenerative disorders like PD will certainly be tremendously beneficial.
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Affiliation(s)
| | - Kelly R Tan
- Biozentrum, University of Basel, Basel, Switzerland
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27
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Chung AS, Miller SM, Sun Y, Xu X, Zweifel LS. Sexual congruency in the connectome and translatome of VTA dopamine neurons. Sci Rep 2017; 7:11120. [PMID: 28894175 PMCID: PMC5593921 DOI: 10.1038/s41598-017-11478-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 08/22/2017] [Indexed: 01/13/2023] Open
Abstract
The ventral tegmental area (VTA) dopamine system is important for reward, motivation, emotion, learning, and memory. Dysfunctions in the dopamine system are linked to multiple neurological and neuropsychiatric disorders, many of which present with sex differences. Little is known about the extent of heterogeneity in the basic organization of VTA dopamine neurons with regard to sex. Here, we characterized the cell-specific connectivity of VTA dopamine neurons, their mRNA translational profile, and basic electrophysiological characteristics in a common strain of mice. We found no major differences in these metrics, except for differential expression of a Y-chromosome associated mRNA transcript, Eif2s3y, and the X-linked, X-inactivation transcript Xist. Of note, Xist transcript was significantly enriched in dopamine neurons, suggesting tight regulation of X-linked gene expression to ensure sexual congruency. These data indicate that the features that make dopamine neurons unique are highly concordant and not a principal source of sexual dimorphism.
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Affiliation(s)
- Amanda S Chung
- Department of Pharmacology, University of Washington, Seattle, WA, 98195, USA
| | - Samara M Miller
- Department of Pharmacology, University of Washington, Seattle, WA, 98195, USA
| | - Yanjun Sun
- Department of Anatomy and Neurobiology, University of California, Irvine, CA, 92697, USA
| | - Xiangmin Xu
- Department of Anatomy and Neurobiology, University of California, Irvine, CA, 92697, USA
| | - Larry S Zweifel
- Department of Pharmacology, University of Washington, Seattle, WA, 98195, USA. .,Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, 98195, USA.
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28
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Kouwenhoven WM, von Oerthel L, Smidt MP. Pitx3 and En1 determine the size and molecular programming of the dopaminergic neuronal pool. PLoS One 2017; 12:e0182421. [PMID: 28800615 PMCID: PMC5553812 DOI: 10.1371/journal.pone.0182421] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Accepted: 07/18/2017] [Indexed: 02/04/2023] Open
Abstract
Mesodiencephalic dopaminergic (mdDA) neurons are located in the ventral midbrain. These neurons form the substantia nigra (SNc) and the ventral tegmental area (VTA). Two transcription factors that play important roles in the process of terminal differentiation and subset-specification of mdDA neurons, are paired-like homeodomain transcription factor 3 (Pitx3), and homeobox transcription factor Engrailed 1 (En1). We previously investigated the single Pitx3KO and En1KO and observed important changes in the survival of mdDA neurons of the SNc and VTA as well as altered expression of pivotal rostral- and caudal-markers, Ahd2 and Cck, respectively. To refine our understanding of the regional-specific relationships between En1 and Pitx3 and their (combined) role in the programming mdDA neurons on the rostral-to-caudal axis, we created double En1tm1Alj/tm1Alj;Pitx3gfp/gfp (En1KO;Pitx3GFP/GFP) animals. Here we report, that in absence of En1 and Pitx3, only a limited number of mdDA neurons are present at E14.5. These mdDA neurons have a rudimentary dopaminergic cell fate, as they express Nurr1, Pbx3 and Otx2 but have lost their rostral or caudal subset identity. Furthermore, we report that the expression of Cck depends on En1 expression, while (in contrast) both Pitx3 and En1 are involved in the initiation of Ahd2 expression. Thus we reveal in this manuscript that regulated levels of Pitx3 and En1 control the size and rostral/caudal-identity of the mdDA neuronal population.
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Affiliation(s)
| | - Lars von Oerthel
- Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, the Netherlands
| | - Marten P. Smidt
- Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, the Netherlands
- * E-mail:
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29
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Differential Somatic Ca2+ Channel Profile in Midbrain Dopaminergic Neurons. J Neurosci 2017; 36:7234-45. [PMID: 27383597 DOI: 10.1523/jneurosci.0459-16.2016] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 05/31/2016] [Indexed: 11/21/2022] Open
Abstract
UNLABELLED Dopaminergic (DA) neurons located in the ventral midbrain continuously generate a slow endogenous pacemaker activity, the mechanism of which is still debated. It has been suggested that, in the substantia nigra pars compacta (SNc), the pacemaking relies more on Ca(2+) channels and that the density of L-type Ca(2+) channels is higher in these DA neurons than in those located in the ventral tegmental area (VTA). This might lead to a higher Ca(2+) load in SNc DA neurons and explain their higher susceptibility to degeneration. However, direct evidence for this hypothesis is lacking. We found that the L-type current and channel density are indeed higher in the somata of rat SNc DA neurons and that this current undergoes less inactivation in this region. Nonstationary fluctuation analysis measurements showed a much higher number of L-type channels in the soma of SNc DA neurons, as well as a smaller single-channel conductance, pointing to a possible different molecular identity of L-type channels in DA neurons from the two areas. A major consequence of this is that pacemaking and, even more so, bursting are associated with a larger Ca(2+) entry through L-type channels in SNc DA neurons than in their VTA counterparts. Our results establish a molecular and functional difference between two populations of midbrain DA neurons that may contribute to their differential sensitivity to neurodegeneration. SIGNIFICANCE STATEMENT Dopamine neurons from the substantia nigra pars compacta (SNc) and ventral tegmental area (VTA) are involved in various brain functions, such as movement initiation and goal directed behavior, respectively. This work shows that, although both neurons fire in a similar regular and slow pacemaker mode, this firing activity is supported by different calcium channel landscapes. Indeed, the L-type calcium current is larger in the soma of dopamine neurons of the SNc, leading to a higher charge transfer through L-type channels during pacemaking and bursting. Therefore, these neurons may be physiologically exposed to a larger stress than their neighbors from the VTA.
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30
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Poulin JF, Tasic B, Hjerling-Leffler J, Trimarchi JM, Awatramani R. Disentangling neural cell diversity using single-cell transcriptomics. Nat Neurosci 2017; 19:1131-41. [PMID: 27571192 DOI: 10.1038/nn.4366] [Citation(s) in RCA: 209] [Impact Index Per Article: 29.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Accepted: 07/22/2016] [Indexed: 12/12/2022]
Abstract
Cellular specialization is particularly prominent in mammalian nervous systems, which are composed of millions to billions of neurons that appear in thousands of different 'flavors' and contribute to a variety of functions. Even in a single brain region, individual neurons differ greatly in their morphology, connectivity and electrophysiological properties. Systematic classification of all mammalian neurons is a key goal towards deconstructing the nervous system into its basic components. With the recent advances in single-cell gene expression profiling technologies, it is now possible to undertake the enormous task of disentangling neuronal heterogeneity. High-throughput single-cell RNA sequencing and multiplexed quantitative RT-PCR have become more accessible, and these technologies enable systematic categorization of individual neurons into groups with similar molecular properties. Here we provide a conceptual and practical guide to classification of neural cell types using single-cell gene expression profiling technologies.
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Affiliation(s)
| | - Bosiljka Tasic
- Department of Molecular Genetics, Allen Institute for Brain Science, Seattle, Washington, USA
| | - Jens Hjerling-Leffler
- Division of Molecular Neurobiology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Jeffrey M Trimarchi
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, Iowa, USA
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31
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Carbone C, Costa A, Provensi G, Mannaioni G, Masi A. The Hyperpolarization-Activated Current Determines Synaptic Excitability, Calcium Activity and Specific Viability of Substantia Nigra Dopaminergic Neurons. Front Cell Neurosci 2017; 11:187. [PMID: 28701928 PMCID: PMC5487410 DOI: 10.3389/fncel.2017.00187] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 06/16/2017] [Indexed: 12/28/2022] Open
Abstract
Differential vulnerability between Substantia Nigra pars compacta (SNpc) and Ventral Tegmental Area (VTA) dopaminergic (DAergic) neurons is a hallmark of Parkinson’s disease (PD). Understanding the molecular bases of this key histopathological aspect would foster the development of much-needed disease-modifying therapies. Non-heterogeneous DAergic degeneration is present in both toxin-based and genetic animal models, suggesting that cellular specificity, rather than causing factors, constitutes the background for differential vulnerability. In this regard, we previously demonstrated that MPP+, a neurotoxin able to cause selective nigrostriatal degeneration in animal rodents and primates, inhibits the Hyperpolarization-activated current (Ih) in SNpc DAergic neurons and that pharmacological Ih antagonism causes potentiation of evoked Excitatory post-synaptic potentials (EPSPs). Of note, the magnitude of such potentiation is greater in the SNpc subfield, consistent with higher Ih density. In the present work, we show that Ih block-induced synaptic potentiation leads to the amplification of somatic calcium responses (SCRs) in vitro. This effect is specific for the SNpc subfield and largely mediated by L-Type calcium channels, as indicated by sensitivity to the CaV 1 blocker isradipine. Furthermore, Ih is downregulated by low intracellular ATP and determines the efficacy of GABAergic inhibition in SNpc DAergic neurons. Finally, we show that stereotaxic administration of Ih blockers causes SNpc-specific neurodegeneration and hemiparkinsonian motor phenotype in rats. During PD progression, Ih downregulation may result from mitochondrial dysfunction and, in concert with PD-related disinhibition of excitatory inputs, determine a SNpc-specific disease pathway.
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Affiliation(s)
- Carmen Carbone
- Department of Neuroscience, Psychology, Drug Research and Child Health (NEUROFARBA), Section of Pharmacology and Toxicology, University of FlorenceFlorence, Italy
| | - Alessia Costa
- Department of Neuroscience, Psychology, Drug Research and Child Health (NEUROFARBA), Section of Pharmacology and Toxicology, University of FlorenceFlorence, Italy
| | - Gustavo Provensi
- Department of Neuroscience, Psychology, Drug Research and Child Health (NEUROFARBA), Section of Pharmacology and Toxicology, University of FlorenceFlorence, Italy
| | - Guido Mannaioni
- Department of Neuroscience, Psychology, Drug Research and Child Health (NEUROFARBA), Section of Pharmacology and Toxicology, University of FlorenceFlorence, Italy.,Toxicology Unit, Azienda Ospedaliero-Universitaria CareggiFlorence, Italy
| | - Alessio Masi
- Department of Neuroscience, Psychology, Drug Research and Child Health (NEUROFARBA), Section of Pharmacology and Toxicology, University of FlorenceFlorence, Italy.,Toxicology Unit, Azienda Ospedaliero-Universitaria CareggiFlorence, Italy
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32
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Survival of a Novel Subset of Midbrain Dopaminergic Neurons Projecting to the Lateral Septum Is Dependent on NeuroD Proteins. J Neurosci 2017; 37:2305-2316. [PMID: 28130357 PMCID: PMC5354344 DOI: 10.1523/jneurosci.2414-16.2016] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 11/07/2016] [Accepted: 11/30/2016] [Indexed: 11/21/2022] Open
Abstract
Midbrain dopaminergic neurons are highly heterogeneous. They differ in their connectivity and firing patterns and, therefore, in their functional properties. The molecular underpinnings of this heterogeneity are largely unknown, and there is a paucity of markers that distinguish these functional subsets. In this paper, we report the identification and characterization of a novel subset of midbrain dopaminergic neurons located in the ventral tegmental area that expresses the basic helix-loop-helix transcription factor, Neurogenic Differentiation Factor-6 (NEUROD6). Retrograde fluorogold tracing experiments demonstrate that Neurod6+ midbrain dopaminergic neurons neurons project to two distinct septal regions: the dorsal and intermediate region of the lateral septum. Loss-of-function studies in mice demonstrate that Neurod6 and the closely related family member Neurod1 are both specifically required for the survival of this lateral-septum projecting neuronal subset during development. Our findings underscore the complex organization of midbrain dopaminergic neurons and provide an entry point for future studies of the functions of the Neurod6+ subset of midbrain dopaminergic neurons.SIGNIFICANCE STATEMENT Midbrain dopaminergic neurons regulate diverse brain functions, including voluntary movement and cognitive and emotive behaviors. These neurons are heterogeneous, and distinct subsets are thought to regulate different behaviors. However, we currently lack the means to identify and modify gene function in specific subsets of midbrain dopaminergic neurons. In this study, we identify the transcription factor NEUROD6 as a specific marker for a novel subset of midbrain dopaminergic neurons in the ventral midbrain that project to the lateral septum, and we reveal essential roles for Neurod1 and Neurod6 in the survival of these neurons during development. Our findings highlight the molecular and anatomical heterogeneity of midbrain dopaminergic neurons and contribute to a better understanding of this functionally complex group of neurons.
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33
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Xicoy H, Wieringa B, Martens GJM. The SH-SY5Y cell line in Parkinson's disease research: a systematic review. Mol Neurodegener 2017; 12:10. [PMID: 28118852 PMCID: PMC5259880 DOI: 10.1186/s13024-017-0149-0] [Citation(s) in RCA: 542] [Impact Index Per Article: 77.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 01/05/2017] [Indexed: 12/29/2022] Open
Abstract
Parkinson’s disease (PD) is a devastating and highly prevalent neurodegenerative disease for which only symptomatic treatment is available. In order to develop a truly effective disease-modifying therapy, improvement of our current understanding of the molecular and cellular mechanisms underlying PD pathogenesis and progression is crucial. For this purpose, standardization of research protocols and disease models is necessary. As human dopaminergic neurons, the cells mainly affected in PD, are difficult to obtain and maintain as primary cells, current PD research is mostly performed with permanently established neuronal cell models, in particular the neuroblastoma SH-SY5Y lineage. This cell line is frequently chosen because of its human origin, catecholaminergic (though not strictly dopaminergic) neuronal properties, and ease of maintenance. However, there is no consensus on many fundamental aspects that are associated with its use, such as the effects of culture media composition and of variations in differentiation protocols. Here we present the outcome of a systematic review of scientific articles that have used SH-SY5Y cells to explore PD. We describe the cell source, culture conditions, differentiation protocols, methods/approaches used to mimic PD and the preclinical validation of the SH-SY5Y findings by employing alternative cellular and animal models. Thus, this overview may help to standardize the use of the SH-SY5Y cell line in PD research and serve as a future user’s guide.
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Affiliation(s)
- Helena Xicoy
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences (RIMLS), Radboudumc, Nijmegen, The Netherlands.,Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, The Netherlands
| | - Bé Wieringa
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences (RIMLS), Radboudumc, Nijmegen, The Netherlands
| | - Gerard J M Martens
- Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, The Netherlands.
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34
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Dutta D, Ali N, Banerjee E, Singh R, Naskar A, Paidi RK, Mohanakumar KP. Low Levels of Prohibitin in Substantia Nigra Makes Dopaminergic Neurons Vulnerable in Parkinson's Disease. Mol Neurobiol 2017; 55:804-821. [PMID: 28062948 DOI: 10.1007/s12035-016-0328-y] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 11/29/2016] [Indexed: 12/18/2022]
Abstract
Since substantia nigra (SN) and ventral tegmental area (VTA) dopaminergic neurons are, respectively, susceptible or largely unaffected in Parkinson's disease (PD), we searched for protein(s) that regulates this differential sensitivity. Differentially, expressed proteins in SN and VTA were investigated employing two-directional gel electrophoresis- matrix-assisted laser desorption ionization time of flight (MALDI-TOF-TOF) analyses. Prohibitin, which is involved in mitochondrial integrity, was validated using immunoblot, qRT-PCR, and immunohistochemistry in normal mice as well as 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-model, PD postmortem human brains, and PD cybrids. In prohibitin over-expression, differentiated SH-SY5Y neurons were investigated for their susceptibility to PD neurotoxin, 1-methyl-4-phenyl-pyridnium (MPP+). Prohibitin, Hsc73, and Cu-Zn superoxide dismutase (Cu-Zn SOD) were highly expressed in VTA, whereas heat shock protein A8 (HSPA8) and 14-3-3ζ/δ were 2-fold more in SN. Prohibitin level was transiently increased in SN but unaltered in VTA on the third day of MPTP-induced mice, whereas in PD human brains, prohibitin was depleted in both these regions. Parallel to mouse SN, an enhanced prohibitin expression was found in human PD cybrids. In MPP+-induced cellular model of PD, reduction in prohibitin level was found to be associated with a loss in its binding with Ndufs3, a mitochondrial complex I protein partner. Prohibitin over-expression resisted MPP+-induced neuronal death by restoring mitochondrial membrane potential, preventing reactive oxygen species generation and cytochrome c release into cytosol. These protective phenomena exerted by prohibitin over-expression altogether hinder caspase 3 activation induced by MPP+. These results imply that prohibitin is an important negotiator protein that regulates dopaminergic cell death in SN and their protection in VTA in PD.
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Affiliation(s)
- Debashis Dutta
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Nilufar Ali
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Emili Banerjee
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Raghavendra Singh
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Amit Naskar
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Ramesh Kumar Paidi
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Kochupurackal P Mohanakumar
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India. .,Inter University Centre for Biomedical Research and Super Speciality Hospital, Mahatma Gandhi University Campus at Thalappady, Rubber Board P.O, Kottayam, Kerala, 686009, India.
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35
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Menegas W, Babayan BM, Uchida N, Watabe-Uchida M. Opposite initialization to novel cues in dopamine signaling in ventral and posterior striatum in mice. eLife 2017; 6. [PMID: 28054919 PMCID: PMC5271609 DOI: 10.7554/elife.21886] [Citation(s) in RCA: 147] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 01/04/2017] [Indexed: 01/02/2023] Open
Abstract
Dopamine neurons are thought to encode novelty in addition to reward prediction error (the discrepancy between actual and predicted values). In this study, we compared dopamine activity across the striatum using fiber fluorometry in mice. During classical conditioning, we observed opposite dynamics in dopamine axon signals in the ventral striatum (‘VS dopamine’) and the posterior tail of the striatum (‘TS dopamine’). TS dopamine showed strong excitation to novel cues, whereas VS dopamine showed no responses to novel cues until they had been paired with a reward. TS dopamine cue responses decreased over time, depending on what the cue predicted. Additionally, TS dopamine showed excitation to several types of stimuli including rewarding, aversive, and neutral stimuli whereas VS dopamine showed excitation only to reward or reward-predicting cues. Together, these results demonstrate that dopamine novelty signals are localized in TS along with general salience signals, while VS dopamine reliably encodes reward prediction error. DOI:http://dx.doi.org/10.7554/eLife.21886.001 New experiences trigger a variety of responses in animals. We are surprised by, move towards, and often explore new objects. But how does the brain control these responses? Dopamine is a molecule that controls many processes in the brain and plays critical roles in various mental disorders, diseases that affect movement, and addiction. Rewarding experiences (like a glass of cold water on a hot day) can trigger dopamine neurons and studies have also shown that dopamine neurons respond to new experiences. This suggested that novelty may be rewarding in itself, or that novelty may signal the potential for future reward. On the other hand, it may be that different groups of dopamine neurons play different roles in responding to new or rewarding experiences. In 2015, it was reported that dopamine neurons connected to the rear part of an area in the brain called the striatum receive signals from different parts of the brain than most other dopamine neurons. The dopamine neurons connected to this “tail” of the striatum preferentially received inputs from regions involved in arousal rather than reward, suggesting that they may have a unique role and transmit a different type of information. Now, Menegas et al. have shown that dopamine signals in different areas of the striatum separate reward from novelty and other signals in mice. The results demonstrate that new odors activate dopamine neurons projecting to the tail of the striatum, but that this activity fades as the novelty wears off (as the mice learn to associate the odor with a particular outcome). By contrast, dopamine neurons projecting to the front of the striatum do not respond to novelty, but rather become more active as mice learn which odors accompany rewards (only responding to odors that predict reward). The experiments also show that dopamine neurons in the tail of the striatum encode information about the importance of a stimulus. Together, these findings indicate that some of the roles dopamine plays in the brain may not be related to reward, but are instead linked to the novelty and importance of the stimulus. The next challenge will be to find out how the separate reward and novelty signals in dopamine neurons relate to the animals’ behavior. This may help us to better understand dopamine-related psychiatric conditions, such as depression and addiction. DOI:http://dx.doi.org/10.7554/eLife.21886.002
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Affiliation(s)
- William Menegas
- Department of Molecular and Cellular Biology, Center for Brain Science, Harvard University, Cambridge, United States
| | - Benedicte M Babayan
- Department of Molecular and Cellular Biology, Center for Brain Science, Harvard University, Cambridge, United States
| | - Naoshige Uchida
- Department of Molecular and Cellular Biology, Center for Brain Science, Harvard University, Cambridge, United States
| | - Mitsuko Watabe-Uchida
- Department of Molecular and Cellular Biology, Center for Brain Science, Harvard University, Cambridge, United States
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Midbrain Gene Screening Identifies a New Mesoaccumbal Glutamatergic Pathway and a Marker for Dopamine Cells Neuroprotected in Parkinson's Disease. Sci Rep 2016; 6:35203. [PMID: 27762319 PMCID: PMC5071886 DOI: 10.1038/srep35203] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Accepted: 09/26/2016] [Indexed: 11/08/2022] Open
Abstract
The ventral tegmental area (VTA) and substantia nigra pars compacta (SNc) of the midbrain are associated with Parkinson’s disease (PD), schizophrenia, mood disorders and addiction. Based on the recently unraveled heterogeneity within the VTA and SNc, where glutamate, GABA and co-releasing neurons have been found to co-exist with the classical dopamine neurons, there is a compelling need for identification of gene expression patterns that represent this heterogeneity and that are of value for development of human therapies. Here, several unique gene expression patterns were identified in the mouse midbrain of which NeuroD6 and Grp were expressed within different dopaminergic subpopulations of the VTA, and TrpV1 within a small heterogeneous population. Optogenetics-coupled in vivo amperometry revealed a previously unknown glutamatergic mesoaccumbal pathway characterized by TrpV1-Cre-expression. Human GRP was strongly detected in non-melanized dopaminergic neurons within the SNc of both control and PD brains, suggesting GRP as a marker for neuroprotected neurons in PD. This study thus unravels markers for distinct subpopulations of neurons within the mouse and human midbrain, defines unique anatomical subregions within the VTA and exposes an entirely new glutamatergic pathway. Finally, both TRPV1 and GRP are implied in midbrain physiology of importance to neurological and neuropsychiatric disorders.
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37
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Paliperidone increases spontaneous and evoked firing of mesocortical dopaminergic neurons by activating a hyperpolarization-activated inward current. Schizophr Res 2016; 176:252-258. [PMID: 27435059 DOI: 10.1016/j.schres.2016.07.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2014] [Revised: 06/29/2016] [Accepted: 07/04/2016] [Indexed: 11/21/2022]
Abstract
Mesocortical dopaminergic (DA) subtype neurons specifically project to the prefrontal cortex, which is closely related with schizophrenia. Mesocortical DA neurons have unique physiological characteristics that are different from those of mesostriatal and mesolimbic DA neurons. Paliperidone, an atypical antipsychotic, is currently used to treat schizophrenia and has better therapeutic effects than typical antipsychotics. However, the underlying physiological mechanism remains unclear. To explore the effects of paliperidone on mesocortical DA neuron activity, here, we retrogradely labeled these cells with fluorescent microsphere retrobeads, and the electrophysiological changes were recorded in whole-cell recordings in rat midbrain slices with or without paliperidone. The data showed that paliperidone (20μmol/L) increased the spontaneous firing rates of labeled mesocortical neurons (P<0.05). Moreover, paliperidone also increased the frequency of evoked action potentials by current injection stimulation (P<0.05), whereas the accompanying amplitude decreased. Furthermore, to explore the mechanisms of paliperidone's effect, Ih currents were detected, and the results showed that hyperpolarizing voltage pulses evoked instantaneous Ih inward currents and paliperidone increased the maximum Ih current. In addition, paliperidone decreased the spontaneous inhibitory postsynaptic currents. Thus, paliperidone increased the spontaneous and evoked firing of mesocortical neurons, possibly by activating the Ih inward current and reducing the inhibitory synaptic transmission, which provides an underlying mechanism of paliperidone's application in schizophrenia.
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Vogt Weisenhorn DM, Giesert F, Wurst W. Diversity matters - heterogeneity of dopaminergic neurons in the ventral mesencephalon and its relation to Parkinson's Disease. J Neurochem 2016; 139 Suppl 1:8-26. [PMID: 27206718 PMCID: PMC5096020 DOI: 10.1111/jnc.13670] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 04/25/2016] [Accepted: 05/17/2016] [Indexed: 12/25/2022]
Abstract
Dopaminergic neurons in the ventral mesencephalon (the ventral mesencephalic dopaminergic complex) are known for their role in a multitude of behaviors, including cognition, reward, addiction and voluntary movement. Dysfunctions of these neurons are the underlying cause of various neuropsychiatric disorders, such as depression, addiction and schizophrenia. In addition, Parkinson's disease (PD), which is the second most common degenerative disease in developed countries, is characterized by the degeneration of dopaminergic neurons, leading to the core motor symptoms of the disease. However, only a subset of dopaminergic neurons in the ventral mesencephalon is highly vulnerable to the disease process. Indeed, research over several decades revealed that the neurons in the ventral mesencephalic dopaminergic complex do not form a homogeneous group with respect to anatomy, physiology, function, molecular identity or vulnerability/dysfunction in different diseases. Here, we review how the concept of dopaminergic neuron diversity, assisted by the advent and application of new technologies, evolved and was refined over time and how it shaped our understanding of PD pathogenesis. Understanding this diversity of neurons in the ventral mesencephalic dopaminergic complex at all levels is imperative for the development of new and more selective drugs for both PD and various other neuropsychiatric diseases. Several decades of research revealed that the neurons in the ventral mesencephalic dopaminergic complex do not form a homogeneous group in respect to anatomy, physiology, function, molecular identity or vulnerability/dysfunction in diseases like Parkinson's disease (PD). Here, we review how this concept evolved and was refined over time and how it shaped our understanding of the pathogenesis of PD. Source of the midbrain image: www.wikimd.org/wiki/index.php/The_Midbrain_or_Mesencephalon; downloaded 28.01.2016. See also Figures and of the paper. This article is part of a special issue on Parkinson disease.
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Affiliation(s)
- Daniela Maria Vogt Weisenhorn
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Developmental Genetics, Neuherberg, Germany
- Technische Universität München-Weihenstephan, Lehrstuhl für Entwicklungsgenetik, c/o Helmholtz Zentrum München, Neuherberg, Germany
| | - Florian Giesert
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Developmental Genetics, Neuherberg, Germany
- Technische Universität München-Weihenstephan, Lehrstuhl für Entwicklungsgenetik, c/o Helmholtz Zentrum München, Neuherberg, Germany
| | - Wolfgang Wurst
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Developmental Genetics, Neuherberg, Germany.
- Technische Universität München-Weihenstephan, Lehrstuhl für Entwicklungsgenetik, c/o Helmholtz Zentrum München, Neuherberg, Germany.
- Deutsches Zentrum für Neurodegenerative Erkrankungen e. V. (DZNE), Standort München, München, Germany.
- Munich Cluster for Systems Neurology (SyNergy), Adolf-Butenandt-Institut, Ludwig-Maximilians-Universität München, München, Germany.
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Nelms BD, Waldron L, Barrera LA, Weflen AW, Goettel JA, Guo G, Montgomery RK, Neutra MR, Breault DT, Snapper SB, Orkin SH, Bulyk ML, Huttenhower C, Lencer WI. CellMapper: rapid and accurate inference of gene expression in difficult-to-isolate cell types. Genome Biol 2016; 17:201. [PMID: 27687735 PMCID: PMC5043525 DOI: 10.1186/s13059-016-1062-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 09/13/2016] [Indexed: 02/25/2023] Open
Abstract
We present a sensitive approach to predict genes expressed selectively in specific cell types, by searching publicly available expression data for genes with a similar expression profile to known cell-specific markers. Our method, CellMapper, strongly outperforms previous computational algorithms to predict cell type-specific expression, especially for rare and difficult-to-isolate cell types. Furthermore, CellMapper makes accurate predictions for human brain cell types that have never been isolated, and can be rapidly applied to diverse cell types from many tissues. We demonstrate a clinically relevant application to prioritize candidate genes in disease susceptibility loci identified by GWAS.
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Affiliation(s)
- Bradlee D Nelms
- Division of Gastroenterology, Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA. .,Graduate Program in Biophysics, Harvard University, Cambridge, MA, 02138, USA.
| | - Levi Waldron
- City University of New York School of Public Health, New York, NY, 10027, USA
| | - Luis A Barrera
- Graduate Program in Biophysics, Harvard University, Cambridge, MA, 02138, USA.,Division of Genetics, Department of Medicine and Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Andrew W Weflen
- Division of Gastroenterology, Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Jeremy A Goettel
- Division of Gastroenterology, Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Guoji Guo
- Center of Stem Cell and Regenerative Medicine, Zhejiang University School of Medicine, Zhejiang, 310058, People's Republic of China
| | - Robert K Montgomery
- Division of Gastroenterology, Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Marian R Neutra
- Division of Gastroenterology, Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA.,Harvard Digestive Diseases Center, Harvard Medical School, Boston, MA, 02115, USA
| | - David T Breault
- Harvard Digestive Diseases Center, Harvard Medical School, Boston, MA, 02115, USA.,Division of Endocrinology, Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Scott B Snapper
- Division of Gastroenterology, Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA.,Harvard Digestive Diseases Center, Harvard Medical School, Boston, MA, 02115, USA.,Department of Gastroenterology, Brigham and Women's Hospital, Boston, MA, 02115, USA
| | - Stuart H Orkin
- Division of Hematology/Oncology and Harvard Stem Cell Institute, Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA.,Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA, 02115, USA
| | - Martha L Bulyk
- Division of Genetics, Department of Medicine and Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Curtis Huttenhower
- Department of Biostatistics, Harvard School of Public Health, Boston, MA, 02115, USA
| | - Wayne I Lencer
- Division of Gastroenterology, Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA. .,Graduate Program in Biophysics, Harvard University, Cambridge, MA, 02138, USA. .,Harvard Digestive Diseases Center, Harvard Medical School, Boston, MA, 02115, USA.
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Medeiros HHA, Santana MAD, Leite MD, Aquino LAP, de Barros MAS, Galvão NT, Ladd FVL, Cavalcante JC, Costa MSMO, Cavalcante JS, Nascimento ES. The cytoarchitectonic and TH-immunohistochemical characterization of the dopamine cell groups in the substantia nigra, ventral tegmental area and retrorubral field in a bat (Artibeus planirostris). Neurosci Res 2016; 112:37-46. [PMID: 27349153 DOI: 10.1016/j.neures.2016.06.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Revised: 06/06/2016] [Accepted: 06/17/2016] [Indexed: 02/04/2023]
Abstract
The dopamine (DA) neurons of the retrorubral field (RRF - A8), the substantia nigra (SN - A9), and the ventral tegmental area (VTA - A10) have been implicated in motor regulation, reward, aversion, cognition, and several neuropsychiatric disorders. A series of studies have identified subdivisions of these cell groups in rodents, but these cell groups have not been well described in bats. An understanding of the motor system organization in bats would provide a context for comparing motor systems across rodent, primate, and bat phylogenies. The aim of this work was to determine whether typical subdivisions of RRF, SN, and VTA are present in Artibeus planirostris, a common frugivorous bat species found throughout South America. Coronal and sagittal sections of bat brain were subjected to Nissl staining and TH immunohistochemistry. The organizational pattern of the nuclei in A. planirostris showed a conspicuous tail in the SN, which has been not described in bats to date, and also contained a well-defined substantia nigra reticulata (SNR) not previously reported in microbats. This work provides for the first time a morphometric analysis of DA neurons in a microchiropteran species, enabling a comparative investigation of vertebrates. Our analysis revealed an apparent phylogenetic stability in these structures, although the SN tail might represent a functional specialization in this species.
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Affiliation(s)
- Helder Henrique Alves Medeiros
- Department of Morphology/Laboratory of Neuroanatomy, Federal University of Rio Grande do Norte, 59072-970 Natal, RN, Brazil
| | | | - Mariana Dias Leite
- Department of Morphology/Laboratory of Neuroanatomy, Federal University of Rio Grande do Norte, 59072-970 Natal, RN, Brazil
| | - Luisa Alves Pereira Aquino
- Department of Morphology/Laboratory of Neuroanatomy, Federal University of Rio Grande do Norte, 59072-970 Natal, RN, Brazil
| | | | - Nayana Tânia Galvão
- Department of Morphology/Laboratory of Neuroanatomy, Federal University of Rio Grande do Norte, 59072-970 Natal, RN, Brazil
| | - Fernando Vagner Lobo Ladd
- Department of Morphology/Laboratory of Neuroanatomy, Federal University of Rio Grande do Norte, 59072-970 Natal, RN, Brazil
| | - Judney Cley Cavalcante
- Department of Morphology/Laboratory of Neuroanatomy, Federal University of Rio Grande do Norte, 59072-970 Natal, RN, Brazil
| | | | - Jeferson Souza Cavalcante
- Department of Physiology/Laboratory of Neurochemical Studies, Biosciences Center, Federal University of Rio Grande do Norte, 59072-970 Natal, RN, Brazil
| | - Expedito Silva Nascimento
- Department of Morphology/Laboratory of Neuroanatomy, Federal University of Rio Grande do Norte, 59072-970 Natal, RN, Brazil.
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41
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Chandler DJ. Evidence for a specialized role of the locus coeruleus noradrenergic system in cortical circuitries and behavioral operations. Brain Res 2016; 1641:197-206. [PMID: 26607255 PMCID: PMC4879003 DOI: 10.1016/j.brainres.2015.11.022] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 10/30/2015] [Accepted: 11/12/2015] [Indexed: 12/25/2022]
Abstract
The brainstem nucleus locus coeruleus (LC) innervates the entire central nervous system and is the primary source of norepinephrine (NE) to the neocortex. While classically considered a homogenous modulator of forebrain activity by virtue of highly widespread and divergent axons, recent behavioral and pharmacological evidence suggest this nucleus may execute distinct operations within functionally distinct terminal fields. Summarized in this review are the anatomical and physiological properties of the nucleus within a historical context that led to the interpretation of the nucleus as a homogeneous entity with uniform and simultaneous actions throughout its terminal fields. Also included are findings from several laboratories which point to a more nuanced model of LC/NE function that parallels that seen in other forebrain-projecting monoaminergic nuclei. Such compartmentalized models of the nucleus promote the idea that specific LC circuits are involved in discrete behavioral operations, and therefore, by identifying the networks that are engaged by LC, the substrates for these behaviors can be identified and manipulated. Perturbations in the functional anatomy and physiology of this system may be related to neuropsychiatric conditions associated with dysregulation of the LC-noradrenergic system such as attention deficit hyperactivity disorder. Recent findings regarding the organization and operation of the LC/NE system collectively challenge the classical view of the nucleus as a relatively homogenous modulator of forebrain activity and provide the basis for a renewed scientific interest in this region of the brain. This article is part of a Special Issue entitled SI: Noradrenergic System.
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Affiliation(s)
- Daniel J Chandler
- Department of Neurobiology and Anatomy Drexel University College of Medicine, Philadelphia, PA 19129, USA.
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42
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Cavalcanti JRLP, Pontes ALB, Fiuza FP, Silva KDA, Guzen FP, Lucena EES, Nascimento-Júnior ES, Cavalcante JC, Costa MSMO, Engelberth RCGJ, Cavalcante JS. Nuclear organization of the substantia nigra, ventral tegmental area and retrorubral field of the common marmoset (Callithrix jacchus): A cytoarchitectonic and TH-immunohistochemistry study. J Chem Neuroanat 2016; 77:100-109. [PMID: 27292410 DOI: 10.1016/j.jchemneu.2016.05.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 05/06/2016] [Accepted: 05/07/2016] [Indexed: 11/19/2022]
Abstract
It is widely known that the catecholamine group is formed by dopamine, noradrenaline and adrenaline. Its synthesis is regulated by the enzyme called tyrosine hydroxylase. 3-hydroxytyramine/dopamine (DA) is a precursor of noradrenaline and adrenaline synthesis and acts as a neurotransmitter in the central nervous system. The three main nuclei, being the retrorubral field (A8 group), the substantia nigra pars compacta (A9 group) and the ventral tegmental area (A10 group), are arranged in the die-mesencephalic portion and are involved in three complex circuitries - the mesostriatal, mesolimbic and mesocortical pathways. These pathways are involved in behavioral manifestations, motricity, learning, reward and also in pathological conditions such as Parkinson's disease and schizophrenia. The aim of this study was to perform a morphological analysis of the A8, A9 and A10 groups in the common marmoset (Callithrix jacchus - a neotropical primate), whose morphological and functional characteristics support its suitability for use in biomedical research. Coronal sections of the marmoset brain were submitted to Nissl staining and TH-immunohistochemistry. The morphology of the neurons made it possible to subdivide the A10 group into seven distinct regions: interfascicular nucleus, raphe rostral linear nucleus and raphe caudal linear nucleus in the middle line; paranigral and parainterfascicular nucleus in the middle zone; the rostral portion of the ventral tegmental area nucleus and parabrachial pigmented nucleus located in the dorsolateral portion of the mesencephalic tegmentum. The A9 group was divided into four regions: substantia nigra compacta dorsal and ventral tiers; substantia nigra compacta lateral and medial clusters. No subdivisions were made for the A8 group. These results reveal that A8, A9 and A10 are phylogenetically stable across species. As such, further studies concerning such divisions are necessary in order to evaluate the occurrence of subdivisions that express DA in other primate species, with the aim of characterizing its functional relevance.
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Affiliation(s)
- José R L P Cavalcanti
- Department of Biomedical Sciences, Laboratory of Experimental Neurology, Health Science Center, University of State of Rio Grande do Norte, Mossoró, RN, Brazil; Department of Physiology, Laboratory of Neurochemical Studies, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil.
| | - André L B Pontes
- Department of Physiology, Laboratory of Neurochemical Studies, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Felipe P Fiuza
- Department of Physiology, Laboratory of Neurochemical Studies, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Kayo D A Silva
- Department of Physiology, Laboratory of Neurochemical Studies, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Fausto P Guzen
- Department of Biomedical Sciences, Laboratory of Experimental Neurology, Health Science Center, University of State of Rio Grande do Norte, Mossoró, RN, Brazil; Department of Physiology, Laboratory of Neurochemical Studies, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Eudes E S Lucena
- Department of Biomedical Sciences, Laboratory of Experimental Neurology, Health Science Center, University of State of Rio Grande do Norte, Mossoró, RN, Brazil; Department of Physiology, Laboratory of Neurochemical Studies, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Expedito S Nascimento-Júnior
- Department of Morphology, Laboratory of Neuroanatomy, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Judney C Cavalcante
- Department of Morphology, Laboratory of Neuroanatomy, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Miriam S M O Costa
- Department of Morphology, Laboratory of Neuroanatomy, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Rovena C G J Engelberth
- Department of Physiology, Laboratory of Neurochemical Studies, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Jeferson S Cavalcante
- Department of Physiology, Laboratory of Neurochemical Studies, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
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Singh U, Kumar S, Shelkar GP, Yadav M, Kokare DM, Goswami C, Lechan RM, Singru PS. Transient receptor potential vanilloid 3 (TRPV3) in the ventral tegmental area of rat: Role in modulation of the mesolimbic-dopamine reward pathway. Neuropharmacology 2016; 110:198-210. [PMID: 27084697 DOI: 10.1016/j.neuropharm.2016.04.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 04/04/2016] [Accepted: 04/10/2016] [Indexed: 12/29/2022]
Abstract
While dopamine (DA) neurons in the ventral tegmental area (VTA) drive the mesolimbic-reward pathway, confluent lines of evidence underscore the importance of transient receptor potential vanilloid (TRPV) channels as novel regulators of these neurons. Among the TRPV-subfamily, TRPV3 is of particular interest in reward, since active ingredients of flavour-enhancing spices in food serve as TRPV3 agonists and modulate DAergic neurotransmission. The nature of TRPV3 elements in the VTA and their role in driving the mesolimbic-DA-reward pathway has however, remained unexplored. We observed TRPV3 mRNA as well as TRPV3-immunoreactive neurons in the VTA of Wistar rats. We therefore explored whether these ion channels participate in modulating mesolimbic-DA reward pathway. In the posterior VTA (pVTA), 82 ± 2.6% of the TRPV3 neurons co-express tyrosine hydroxylase and 68 ± 5.5% of these neurons project to the nucleus accumbens shell (Acb shell). While ex vivo treatment of midbrain slices with TRPV3-agonist, thymol increased [Ca(2+)]i-activity in pVTA neurons, intra-pVTA injections of thymol in freely-moving, satiated rats enhanced positive reinforcement for active lever pressings in an operant chamber to self-administer sweet pellets. This behavior was attenuated by prior treatment with intra-Acb shell DA D1- and D2-like receptor antagonists. These results demonstrate a role for TRPV3 in driving mesolimbic-DA food-reward pathway, and underscores the importance of these channels in the VTA as key components processing reward.
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Affiliation(s)
- Uday Singh
- School of Biological Sciences, National Institute of Science Education and Research (NISER)-Bhubaneswar, 752050, Odisha, India
| | - Santosh Kumar
- School of Biological Sciences, National Institute of Science Education and Research (NISER)-Bhubaneswar, 752050, Odisha, India
| | - Gajanan P Shelkar
- Department of Pharmaceutical Sciences, R.T.M. Nagpur University, Nagpur, 440033, Maharashtra, India
| | - Manoj Yadav
- School of Biological Sciences, National Institute of Science Education and Research (NISER)-Bhubaneswar, 752050, Odisha, India
| | - Dadasaheb M Kokare
- Department of Pharmaceutical Sciences, R.T.M. Nagpur University, Nagpur, 440033, Maharashtra, India
| | - Chandan Goswami
- School of Biological Sciences, National Institute of Science Education and Research (NISER)-Bhubaneswar, 752050, Odisha, India
| | - Ronald M Lechan
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Tupper Research Institute, Tufts Medical Center, Boston, MA, USA; Department of Neuroscience, Tufts University School of Medicine, Boston, MA, USA
| | - Praful S Singru
- School of Biological Sciences, National Institute of Science Education and Research (NISER)-Bhubaneswar, 752050, Odisha, India.
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Anderegg A, Poulin JF, Awatramani R. Molecular heterogeneity of midbrain dopaminergic neurons--Moving toward single cell resolution. FEBS Lett 2015; 589:3714-26. [PMID: 26505674 DOI: 10.1016/j.febslet.2015.10.022] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 10/19/2015] [Accepted: 10/19/2015] [Indexed: 12/31/2022]
Abstract
Since their discovery, midbrain dopamine (DA) neurons have been researched extensively, in part because of their diverse functions and involvement in various neuropsychiatric disorders. Over the last few decades, reports have emerged that midbrain DA neurons were not a homogeneous group, but that DA neurons located in distinct anatomical locations within the midbrain had distinctive properties in terms of physiology, function, and vulnerability. Accordingly, several studies focused on identifying heterogeneous gene expression across DA neuron clusters. Here we review the importance of understanding DA neuron heterogeneity at the molecular level, previous studies detailing heterogeneous gene expression in DA neurons, and finally recent work which brings together previous heterogeneous gene expression profiles in a coordinated manner, at single cell resolution.
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Affiliation(s)
- Angela Anderegg
- Department of Neurology and Center for Genetic Medicine, Northwestern University, Chicago, IL 60611, United States
| | - Jean-Francois Poulin
- Department of Neurology and Center for Genetic Medicine, Northwestern University, Chicago, IL 60611, United States
| | - Rajeshwar Awatramani
- Department of Neurology and Center for Genetic Medicine, Northwestern University, Chicago, IL 60611, United States
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Bodea GO, Blaess S. Establishing diversity in the dopaminergic system. FEBS Lett 2015; 589:3773-85. [PMID: 26431946 DOI: 10.1016/j.febslet.2015.09.016] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2015] [Revised: 09/13/2015] [Accepted: 09/16/2015] [Indexed: 11/19/2022]
Abstract
Midbrain dopaminergic neurons (MbDNs) modulate cognitive processes, regulate voluntary movement, and encode reward prediction errors and aversive stimuli. While the degeneration of MbDNs underlies the motor defects in Parkinson's disease, imbalances in dopamine levels are associated with neuropsychiatric disorders such as depression, schizophrenia and substance abuse. In recent years, progress has been made in understanding how MbDNs, which constitute a relatively small neuronal population in the brain, can contribute to such diverse functions and dysfunctions. In particular, important insights have been gained regarding the distinct molecular, neurochemical and network properties of MbDNs. How this diversity of MbDNs is established during brain development is only starting to be unraveled. In this review, we summarize the current knowledge on the diversity in MbDN progenitors and differentiated MbDNs in the developing rodent brain. We discuss the signaling pathways, transcription factors and transmembrane receptors that contribute to setting up these diverse MbDN subpopulations. A better insight into the processes that establish diversity in MbDNs will ultimately improve the understanding of the architecture and function of the dopaminergic system in the adult brain.
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Affiliation(s)
- Gabriela O Bodea
- Mater Research Institute - University of Queensland, Translational Research Institute, Woolloongabba, QLD 4102, Australia; Queensland Brain Institute, University of Queensland, Brisbane, QLD 4072, Australia
| | - Sandra Blaess
- Institute of Reconstructive Neurobiology, Life and Brain Center, University of Bonn, Bonn, Germany.
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Tan JBL, Lim YY. Antioxidant and tyrosinase inhibition activity of the fertile fronds and rhizomes of three different Drynaria species. BMC Res Notes 2015; 8:468. [PMID: 26395256 PMCID: PMC4580379 DOI: 10.1186/s13104-015-1414-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Accepted: 09/07/2015] [Indexed: 11/28/2022] Open
Abstract
Background For generations, the rhizomes of Drynaria ferns have been used as traditional medicine in Asia. Despite this, the bioactivities of Drynaria rhizomes and leaves have rarely been studied scientifically. Methods This study evaluates the antioxidant properties of the methanolic extracts of the fertile fronds and rhizomes from three species in this genus: Drynaria quercifolia, Drynaria rigidula and Drynaria sparsisora. The phenolic and flavonoid contents of the samples were respectively quantified with the total phenolic content (TPC) and total flavonoid content (TFC) assays, while the antioxidant activities were determined via measuring the DPPH radical scavenging activity (FRS), ferric reducing power (FRP), ferrous ion chelating (FIC) activity and lipid peroxidation inhibition (LPI). The tyrosinase inhibition activity of all three species was also reported. Results The fertile fronds of D. quercifolia were found to exhibit the highest overall TPC (2939 ± 469 mg GAE/100 g) and antioxidant activity amongst all the samples, and the fertile fronds of D. quercifolia and D. rigidula exhibited superior TPC and FRP compared to their rhizomes, despite only the latter being widely used in traditional medicine. The fronds of D. quercifolia had high tyrosinase inhibition activity (56.6 ± 5.0 %), but most of the Drynaria extracts showed unexpected tyrosinase enhancement instead, particularly for D. sparsisora’s fronds. Conclusion The high bioactivity of the fertile fronds in the fern species indicate that there is value in further research on the fronds of ferns which are commonly used mostly, or only, for their rhizomes.
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Affiliation(s)
- Joash Ban Lee Tan
- School of Science, Monash University Malaysia, Bandar Sunway, 46150, Petaling Jaya, Selangor, Malaysia.
| | - Yau Yan Lim
- School of Science, Monash University Malaysia, Bandar Sunway, 46150, Petaling Jaya, Selangor, Malaysia.
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47
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Filograna R, Civiero L, Ferrari V, Codolo G, Greggio E, Bubacco L, Beltramini M, Bisaglia M. Analysis of the Catecholaminergic Phenotype in Human SH-SY5Y and BE(2)-M17 Neuroblastoma Cell Lines upon Differentiation. PLoS One 2015; 10:e0136769. [PMID: 26317353 PMCID: PMC4552590 DOI: 10.1371/journal.pone.0136769] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Accepted: 08/08/2015] [Indexed: 11/19/2022] Open
Abstract
Human cell lines are often used to investigate cellular pathways relevant for physiological or pathological processes or to evaluate cell toxicity or protection induced by different compounds, including potential drugs. In this study, we analyzed and compared the differentiating activities of three agents (retinoic acid, staurosporine and 12-O-tetradecanoylphorbol-13-acetate) on the human neuroblastoma SH-SY5Y and BE(2)-M17 cell lines; the first cell line is largely used in the field of neuroscience, while the second is still poorly characterized. After evaluating their effects in terms of cell proliferation and morphology, we investigated their catecholaminergic properties by assessing the expression profiles of the major genes involved in catecholamine synthesis and storage and the cellular concentrations of the neurotransmitters dopamine and noradrenaline. Our results demonstrate that the two cell lines possess similar abilities to differentiate and acquire a neuron-like morphology. The most evident effects in SH-SY5Y cells were observed in the presence of staurosporine, while in BE(2)-M17 cells, retinoic acid induced the strongest effects. Undifferentiated SH-SY5Y and BE(2)-M17 cells are characterized by the production of both NA and DA, but their levels are considerably higher in BE(2)-M17 cells. Moreover, the NAergic phenotype appears to be more pronounced in SH-SY5Y cells, while BE(2)-M17 cells have a more prominent DAergic phenotype. Finally, the catecholamine concentration strongly increases upon differentiation induced by staurosporine in both cell lines. In conclusion, in this work the catecholaminergic phenotype of the human BE(2)-M17 cell line upon differentiation was characterized for the first time. Our data suggest that SH-SY5Y and BE(2)-M17 represent two alternative cell models for the neuroscience field.
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Affiliation(s)
- Roberta Filograna
- Molecular Physiology and Biophysics Unit, Department of Biology, University of Padova, Padova, Italy
| | - Laura Civiero
- Molecular Physiology and Biophysics Unit, Department of Biology, University of Padova, Padova, Italy
| | - Vanni Ferrari
- Molecular Physiology and Biophysics Unit, Department of Biology, University of Padova, Padova, Italy
| | - Gaia Codolo
- General Pathology Unit, Department of Biology, University of Padova, Padova, Italy
| | - Elisa Greggio
- Molecular Physiology and Biophysics Unit, Department of Biology, University of Padova, Padova, Italy
| | - Luigi Bubacco
- Molecular Physiology and Biophysics Unit, Department of Biology, University of Padova, Padova, Italy
| | - Mariano Beltramini
- Molecular Physiology and Biophysics Unit, Department of Biology, University of Padova, Padova, Italy
- * E-mail: (M. Beltramini); (M. Bisaglia)
| | - Marco Bisaglia
- Molecular Physiology and Biophysics Unit, Department of Biology, University of Padova, Padova, Italy
- * E-mail: (M. Beltramini); (M. Bisaglia)
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48
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Brichta L, Shin W, Jackson-Lewis V, Blesa J, Yap EL, Walker Z, Zhang J, Roussarie JP, Alvarez MJ, Califano A, Przedborski S, Greengard P. Identification of neurodegenerative factors using translatome-regulatory network analysis. Nat Neurosci 2015. [PMID: 26214373 PMCID: PMC4763340 DOI: 10.1038/nn.4070] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
For degenerative disorders of the CNS, the main obstacle to therapeutic advancement has been the challenge of identifying the key molecular mechanisms underlying neuronal loss. We developed a combinatorial approach including translational profiling and brain regulatory network analysis to search for key determinants of neuronal survival or death. Following the generation of transgenic mice for cell type-specific profiling of midbrain dopaminergic neurons, we established and compared translatome libraries reflecting the molecular signature of these cells at baseline or under degenerative stress. Analysis of these libraries by interrogating a context-specific brain regulatory network led to the identification of a repertoire of intrinsic upstream regulators that drive the dopaminergic stress response. The altered activity of these regulators was not associated with changes in their expression levels. This strategy can be generalized for the identification of molecular determinants involved in the degeneration of other classes of neurons.
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Affiliation(s)
- Lars Brichta
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, New York, USA
| | - William Shin
- Department of Systems Biology, Columbia University, New York, New York, USA.,Department of Biological Sciences, Columbia University, New York, New York, USA
| | - Vernice Jackson-Lewis
- Department of Neurology, Columbia University, New York, New York, USA.,Department of Pathology and Cell Biology, Columbia University, New York, New York, USA.,Center for Motor Neuron Biology and Disease, Columbia University, New York, New York, USA.,Columbia Translational Neuroscience Initiative, Columbia University, New York, New York, USA
| | - Javier Blesa
- Department of Neurology, Columbia University, New York, New York, USA.,Department of Pathology and Cell Biology, Columbia University, New York, New York, USA.,Center for Motor Neuron Biology and Disease, Columbia University, New York, New York, USA.,Columbia Translational Neuroscience Initiative, Columbia University, New York, New York, USA
| | - Ee-Lynn Yap
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, New York, USA
| | - Zachary Walker
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, New York, USA
| | - Jack Zhang
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, New York, USA
| | - Jean-Pierre Roussarie
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, New York, USA
| | - Mariano J Alvarez
- Department of Systems Biology, Columbia University, New York, New York, USA
| | - Andrea Califano
- Department of Systems Biology, Columbia University, New York, New York, USA
| | - Serge Przedborski
- Department of Neurology, Columbia University, New York, New York, USA.,Department of Pathology and Cell Biology, Columbia University, New York, New York, USA.,Center for Motor Neuron Biology and Disease, Columbia University, New York, New York, USA.,Columbia Translational Neuroscience Initiative, Columbia University, New York, New York, USA
| | - Paul Greengard
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, New York, USA
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49
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Parkinson GM, Dayas CV, Smith DW. Age-related gene expression changes in substantia nigra dopamine neurons of the rat. Mech Ageing Dev 2015; 149:41-9. [PMID: 26065381 DOI: 10.1016/j.mad.2015.06.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Revised: 06/01/2015] [Accepted: 06/02/2015] [Indexed: 02/01/2023]
Abstract
Ageing affects most, if not all, functional systems in the body. For example, the somatic motor nervous system, responsible for initiating and regulating motor output to skeletal musculature, is vulnerable to ageing. The nigrostriatal dopamine pathway is one component of this system, with deficits in dopamine signalling contributing to major motor dysfunction, as exemplified in Parkinson's disease (PD). However, while the dopamine deficit in PD is due to degeneration of substantia nigra (SN) dopamine (DA) neurons, it is unclear whether there is sufficient loss of SN DA neurons with ageing to explain observed motor impairments. Instead, evidence suggests that age-related loss of DA neuron function may be more important than frank cell loss. To further elucidate the mechanisms of functional decline, we have investigated age-related changes in gene expression specifically in laser microdissected SN DA neurons. There were significant age-related changes in the expression of genes associated with neurotrophic factor signalling and the regulation of tyrosine hydroxylase activity. Furthermore, reduced expression of the DA neuron-associated transcription factor, Nurr1, may contribute to these changes. Together, these results suggest that altered neurotrophic signalling and tyrosine hydroxylase activity may contribute to altered DA neuron signalling and motor nervous system regulation in ageing.
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Affiliation(s)
- Gemma M Parkinson
- Preclinical Neurobiology Research Program, School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, NSW 2308, Australia; Centre for Translational Neuroscience and Mental Health Research, University of Newcastle, Callaghan, NSW 2308, Australia; Hunter Medical Research Institute, 1/Kookaburra Circuit, New Lambton Heights, NSW 2305, Australia.
| | - Christopher V Dayas
- Preclinical Neurobiology Research Program, School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, NSW 2308, Australia; Centre for Translational Neuroscience and Mental Health Research, University of Newcastle, Callaghan, NSW 2308, Australia; Hunter Medical Research Institute, 1/Kookaburra Circuit, New Lambton Heights, NSW 2305, Australia.
| | - Doug W Smith
- Preclinical Neurobiology Research Program, School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, NSW 2308, Australia; Centre for Translational Neuroscience and Mental Health Research, University of Newcastle, Callaghan, NSW 2308, Australia; Hunter Medical Research Institute, 1/Kookaburra Circuit, New Lambton Heights, NSW 2305, Australia.
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50
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Brimblecombe KR, Gracie CJ, Platt NJ, Cragg SJ. Gating of dopamine transmission by calcium and axonal N-, Q-, T- and L-type voltage-gated calcium channels differs between striatal domains. J Physiol 2015; 593:929-46. [PMID: 25533038 DOI: 10.1113/jphysiol.2014.285890] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Accepted: 12/17/2014] [Indexed: 01/05/2023] Open
Abstract
KEY POINTS The voltage-gated Ca(2+) channels (VGCCs) that catalyse striatal dopamine transmission are critical to dopamine function and might prime subpopulations of neurons for parkinsonian degeneration. However, the VGCCs that operate on mesostriatal axons are incompletely defined; previous studies encompassed channels on striatal cholinergic interneurons that strongly influence dopamine transmission. We define that multiple types of axonal VGCCs operate that extend beyond classic presynaptic N/P/Q channels to include T- and L-types. We reveal differences in VGCC function between mouse axon types that in humans are vulnerable versus resistant to Parkinson's disease. We show for the first time that this is underpinned by different sensitivity of dopamine transmission to extracellular Ca(2+) and by different spatiotemporal intracellular Ca(2+) microdomains. These data define key principles of how Ca(2+) and VGCCs govern dopamine transmission in the healthy brain and reveal differences between neuron types that might contribute to vulnerability in disease. ABSTRACT The axonal voltage-gated Ca(2+) channels (VGCCs) that catalyse dopamine (DA) transmission are incompletely defined. Yet, they are critical to DA function and might prime subpopulations of DA neurons for parkinsonian degeneration. Previous studies of VGCCs will have encompassed those on striatal cholinergic interneurons, which strongly influence DA transmission. We identify which VGCCs on DA axons govern DA transmission, we determine their dynamic properties and reveal an underlying basis for differences between the caudate putamen (CPu) and nucleus accumbens (NAc). We detected DA release evoked electrically during nicotinic receptor blockade or optogenetically by light activation of channel rhodopsin-expressing DA axons in mouse striatal slices. Subtype-specific VGCC blockers indicated that N-, Q-, T- and L-VGCCs govern DA release in CPu, but in NAc, T and L-channels are relatively silent. The roles of the most dominant channels were inversely frequency-dependent, due to low-pass filtering of DA release by Ca(2+)-dependent relationships between initial release probability and short-term plasticity. Ca(2+) concentration-response curves revealed that differences between CPu and NAc were due to greater underlying Ca(2+) sensitivity of DA transmission from CPu axons. Functions for 'silent' L- and T-channels in NAc could be unmasked by elevating extracellular [Ca(2+)]. Furthermore, we identified a greater coupling between BAPTA-sensitive, fast Ca(2+) transients and DA transmission in CPu axons, and evidence for endogenous fast buffering of Ca(2+) in NAc. These data reveal that a range of VGCCs operate dynamically on DA axons, depending on local driving forces. Furthermore, they reveal dramatic differences in Ca(2+) handling between axonal subpopulations that show different vulnerability to parkinsonian degeneration.
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Affiliation(s)
- Katherine R Brimblecombe
- Department of Physiology, Anatomy and Genetics, Sherrington Building, University of Oxford, Oxford, UK
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