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Exploring Diversity in the Midbrain Dopamine System with Emphasis on the Ventral Tegmental Area

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Exploring Diversity in the Midbrain Dopamine System with Emphasis on the Ventral Tegmental Area Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1985 Exploring Diversity in the Midbrain Dopamine System with Emphasis on the Ventral Tegmental Area BIANCA VLCEK ACTA UNIVERSITATIS UPSALIENSIS ISSN 1651-6214 ISBN 978-91-513-1057-2 UPPSALA urn:nbn:se:uu:diva-423730 2020 Dissertation presented at Uppsala University to be publicly examined in Ekmanssalen, Evolutionsbiologiskt centrum, Norbyvägen 16, Uppsala, Wednesday, 16 December 2020 at 09:15 for the degree of Doctor of Philosophy. The examination will be conducted in English. Faculty examiner: Associate Professor Eva Hedlund. Abstract Vlcek, B. 2020. Exploring Diversity in the Midbrain Dopamine System with Emphasis on the Ventral Tegmental Area. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1985. 72 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-513-1057-2. Midbrain dopamine neurons of the substantia nigra pars compacta (SNc) and ventral tegmental area (VTA) are important for motor, cognitive and limbic functions through substantial projections to forebrain structures. Dysfunction of the midbrain dopamine system is associated with several disorders, including Parkinson´s disease (PD) and substance use disorder. PD is characterized by the loss of dopaminergic neurons leading to severe motor dysfunction and by the brain distribution of aggregated α-Synuclein protein. Mutations in the α-Synuclein gene (SNCA) have been associated with PD. The overall aim of this thesis was to increase the understanding of anatomical and histological features of dopamine neurons by identifying and characterizing gene expression differences between dopamine neurons, primarily those located within VTA but also the SNc. This knowledge should help towards increased understanding of the roles exerted by different dopamine neurons in behavior during healthy conditions and in disease. For this purpose, unbiased microarray analysis was first performed to identify genes that are differentially expressed in the VTA and SNc. Identified genes, e.g. Trpv1, NeuroD6, Calbindin and Grp, were analyzed on mRNA level primarily in mouse brain sections to determine their distribution patterns. Several were found to localize only in restricted neurons within the VTA, thus defining subpopulations of dopamine neurons in the mouse VTA. Further analysis revealed several interesting findings. For example, in clinical samples of PD biopsies, most dopamine neurons were degenerated, but those remaining were positive for Grp. VTA dopamine neurons positive for NeuroD6 or Calbindin2 were investigated using optogenetics. Activation of the NeuroD6-neurons, but not Calbindin2-neurons, was unexpectedly revealed as sufficient to drive place preference. To address the integrity of midbrain dopamine neurons in mouse models of PD, fluorescent in situ hybridization analyses was performed in two transgenic mouse lines expressing the human SNCA gene and in one dopamine degeneration lesion model, the 6- OHDA method. Despite near-ubiquitous presence of SNCA mRNA, all markers for midbrain dopamine cells remained intact in both transgenic models. Dopamine neurons thus showed an unanticipated robustness towards α-Synuclein pathology not described before. In contrast, most dopamine neurons were lost in the lesion model. In summary, by identifying and characterizing dopamine neurons using established and new markers, histological analyses revealed the presence of distinct gene expression patterns within the VTA that allowed anatomical and functional assessments of discrete subpopulations of midbrain neurons. The thesis contributes new knowledge of the midbrain dopamine system. Bianca Vlcek, Department of Organismal Biology, Comparative Physiology, Norbyv 18 A, Uppsala University, SE-75236 Uppsala, Sweden. © Bianca Vlcek 2020 ISSN 1651-6214 ISBN 978-91-513-1057-2 urn:nbn:se:uu:diva-423730 (http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-423730) “Most people say that it is the intellect which makes a great scientist. They are wrong, it is character” Albert Einstein Till min familj Para a minha família To my family List of Papers This thesis is based on the following papers, which are referred to in the text by their Roman numerals. I Viereckel, T., Dumas, S., Smith-Anttila, C.J.A., Vlcek, B., Bimpisidis Z., Lagerström, M. C., Konradsson-Geuken, Å., Wal- lén-Mackenzie, Å. (2016): Midbrain gene screening identifies a new mesoaccumbal glutamatergic pathway and a marker for do- pamine cells neuroprotected in Parkinson’s disease. Scientific Reports, 6: 35203. II Bimpisidis, Z., König, N., Stagkourakis, S., Zell, V., Vlcek, B., Dumas, S., Giros, B., Broberger, C., Hnasko, S., T., Wallén-Mac- kenzie, Å. (2019): The NeuroD6 subtype of VTA neurons con- tributes to psychostimulant sensitization and behavioral rein- forcement. eNeuro, 6 (3). III Vlcek, B., Dumas, S., Ekmark-Lewén, S., Ingelsson, M., Wallén- Mackenzie, Å. (2020): Preserved gene expression patterns in midbrain dopamine neurons of two different transgenic mouse lines expressing the human α-synuclein (SNCA) gene Manuscript. IV Vlcek, B., Guillaumin, A., Wallén-Mackenzie, Å. (2020): Ven- tral tegmental area neuronal subpopulations are strongly affected in a 6-OHDA mouse model. Manuscript. Reprints were made with permission from the respective publisher. Additional Paper My work has also contributed to the following paper that is beyond the focus of this thesis: Wallén-Mackenzie, Å., Dumas, S., Papathanou, M., Martis Thiele, M.M., Vlcek, B., König, N., Björklund, ÅK. (2020): Spatio-molecular domains iden- tified in the mouse subthalamic nucleus and neighboring glutamatergic and GABAergic brain structures. Communications Biology - Nature, 3 (338). Contents Introduction ................................................................................................... 11 The Midbrain Dopamine System ............................................................. 12 Dopamine Neurons .............................................................................. 12 Anatomical Organization ..................................................................... 13 The Substantia Nigra (SN) ................................................................... 15 The Ventral Tegmental Area (VTA) ................................................... 16 Functions of the Midbrain Dopamine System .......................................... 18 The Basal Ganglia ............................................................................... 18 Motor Loop .......................................................................................... 19 Limbic Loop ......................................................................................... 20 Diversity within Circuitries of the Midbrain Dopamine System .............. 21 Dysfunction in the Midbrain Dopamine System ...................................... 22 Substance Use Disorder (Drug addiction) ........................................... 22 Parkinson’s Disease (PD) .................................................................... 23 Animal models of PD .......................................................................... 27 Toxin-induced models .......................................................................... 27 6-OHDA mouse model ......................................................................... 28 Genetic models .................................................................................... 29 Diversity within the VTA .................................................................... 31 Dopamine and Glutamate Co-phenotype ............................................. 31 GABA and GABA/Dopamine Co-phenotype ...................................... 32 Gene Expression Diversity .................................................................. 33 Overall Aim .............................................................................................. 37 Materials and Methods .................................................................................. 38 Mice .......................................................................................................... 38 Stereotaxic 6-OHDA injection ................................................................. 39 Post-operative care ................................................................................... 40 Tissue preparation for histology ............................................................... 40 In Situ Hybridizzzation ............................................................................. 40 Synthesis of PCR Products and Riboprobes ............................................. 41 Fluorescent In Situ Hybridization (FISH) ................................................ 43 Immunohistochemistry ............................................................................. 45 Study I ........................................................................................................... 47 Study II ......................................................................................................... 50 Study III ........................................................................................................ 53 Study IV ........................................................................................................ 56 Concluding Remarks ..................................................................................... 58 Acknowledgements ......................................................................................
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