1
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Sakamoto H, Inutsuka A. Membrane-Targeted palGFP Predominantly Localizes to the Plasma Membrane but not to Neurosecretory Vesicle Membranes in Rat Oxytocin Neurons. Acta Histochem Cytochem 2024; 57:85-88. [PMID: 38695035 PMCID: PMC11058463 DOI: 10.1267/ahc.24-00001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Accepted: 01/22/2024] [Indexed: 05/04/2024] Open
Abstract
Recent advances in viral vector technology, specifically using adeno-associated virus (AAV) vectors, have significantly expanded possibilities in neuronal tracing. We have utilized the Cre/loxP system in combination with AAV techniques in rats to explore the subcellular localization of palmitoylation signal-tagged GFP (palGFP) in oxytocin-producing neurosecretory neurons. A distinctive branching pattern of single axons was observed at the level of the terminals in the posterior pituitary. Despite challenges in detecting palGFP signals by fluorescent microscopy, immunoelectron microscopy demonstrated predominant localization on the plasma membrane, with a minor presence on the neurosecretory vesicle membrane. These findings suggest that membrane-anchored palGFP may undergo exocytosis, translocating from the plasma membrane to the neurosecretory vesicle membrane. In this study, we observed characteristic axon terminal structures in the posterior pituitary of oxytocin neurons. This study indicates the importance of understanding the plasma membrane-specific sorting system in neuronal membrane migration and encourages future studies on the underlying mechanisms.
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Affiliation(s)
- Hirotaka Sakamoto
- Department of Biology, Faculty of Environmental, Life, Natural Science and Technology, Okayama University, Okayama, Japan
- Ushimado Marine Institute (UMI), Faculty of Environmental, Life, Natural Science and Technology, Okayama University, Okayama, Japan
| | - Ayumu Inutsuka
- Division of Brain and Neurophysiology, Department of Physiology, Jichi Medical University, Tochigi, Japan
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2
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Horii-Hayashi N, Masuda K, Kato T, Kobayashi K, Inutsuka A, Nambu MF, Tanaka KZ, Inoue K, Nishi M. Entrance-sealing behavior in the home cage: a defensive response to potential threats linked to the serotonergic system and manifestation of repetitive/stereotypic behavior in mice. Front Behav Neurosci 2024; 17:1289520. [PMID: 38249128 PMCID: PMC10799337 DOI: 10.3389/fnbeh.2023.1289520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 12/11/2023] [Indexed: 01/23/2024] Open
Abstract
The security of animal habitats, such as burrows and nests, is vital for their survival and essential activities, including eating, mating, and raising offspring. Animals instinctively exhibit defensive behaviors to protect themselves from imminent and potential threats. In 1963, researchers reported wild rats sealing the entrances to their burrows from the inside using materials such as mud, sand, and vegetation. This behavior, known as "entrance sealing (ES)," involves repetitive movements of their nose/mouth and forepaws and is likely a proactive measure against potential intruders, which enhances burrow security. These observations provide important insights into the animals' ability to anticipate potential threats that have not yet occurred and take proactive actions. However, this behavior lacks comprehensive investigation, and the neural mechanisms underpinning it remain unclear. Hypothalamic perifornical neurons expressing urocortin-3 respond to novel objects/potential threats and modulate defensive responses to the objects in mice, including risk assessment and burying. In this study, we further revealed that chemogenetic activation of these neurons elicited ES-like behavior in the home-cage. Furthermore, behavioral changes caused by activating these neurons, including manifestations of ES-like behavior, marble-burying, and risk assessment/burying of a novel object, were effectively suppressed by selective serotonin-reuptake inhibitors. The c-Fos analysis indicated that ES-like behavior was potentially mediated through GABAergic neurons in the lateral septum. These findings underscore the involvement of hypothalamic neurons in the anticipation of potential threats and proactive defense against them. The links of this security system with the manifestation of repetitive/stereotypic behaviors and the serotonergic system provide valuable insights into the mechanisms underlying the symptoms of obsessive-compulsive disorder.
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Affiliation(s)
- Noriko Horii-Hayashi
- Anatomy and Cell Biology, Department of Medicine, Nara Medical University, Kashihara, Japan
| | - Kazuya Masuda
- Anatomy and Cell Biology, Department of Medicine, Nara Medical University, Kashihara, Japan
| | - Taika Kato
- Anatomy and Cell Biology, Department of Medicine, Nara Medical University, Kashihara, Japan
| | - Kenta Kobayashi
- Section of Viral Vector Development, National Institute for Physiological Sciences, Okazaki, Japan
| | - Ayumu Inutsuka
- Department of Physiology, Jichi Medical University, Shimono, Japan
| | - Miyu F. Nambu
- Memory Research Unit, Okinawa Institute of Science and Technology Graduate University (OIST), Kunigami-gun, Japan
| | - Kazumasa Z. Tanaka
- Memory Research Unit, Okinawa Institute of Science and Technology Graduate University (OIST), Kunigami-gun, Japan
| | - Koichi Inoue
- Anatomy and Cell Biology, Department of Medicine, Nara Medical University, Kashihara, Japan
| | - Mayumi Nishi
- Anatomy and Cell Biology, Department of Medicine, Nara Medical University, Kashihara, Japan
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3
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Usui N, Yoshida M, Takayanagi Y, Nasanbuyan N, Inutsuka A, Kurosu H, Mizukami H, Mori Y, Kuro‐o M, Onaka T. Roles of fibroblast growth factor 21 in the control of depression-like behaviours after social defeat stress in male rodents. J Neuroendocrinol 2021; 33:e13026. [PMID: 34472154 PMCID: PMC9285091 DOI: 10.1111/jne.13026] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 08/04/2021] [Accepted: 08/05/2021] [Indexed: 12/12/2022]
Abstract
Fibroblast growth factor 21 (FGF21) modulates energy metabolism and neuroendocrine stress responses. FGF21 synthesis is increased after environmental or metabolic challenges. Detailed roles of FGF21 in the control of behavioural disturbances under stressful conditions remain to be clarified. Here, we examined the roles of FGF21 in the control of behavioural changes after social defeat stress in male rodents. Central administration of FGF21 increased the number of tyrosine hydroxylase-positive catecholaminergic cells expressing c-Fos protein, an activity marker of neurones, in the nucleus tractus solitarius and area postrema. Double in situ hybridisation showed that some catecholaminergic neurones in the dorsal medulla oblongata expressed β-Klotho, an essential co-receptor for FGF21, in male mice. Social defeat stress increased FGF21 concentrations in the plasma of male mice. FGF21-deficient male mice showed social avoidance in a social avoidance test with C57BL/6J mice (background strain of FGF21-deficient mice) and augmented immobility behaviour in a forced swimming test after social defeat stress. On the other hand, overexpression of FGF21 by adeno-associated virus vectors did not significantly change behaviours either in wild-type male mice or FGF21-deficient male mice. The present data are consistent with the view that endogenous FGF21, possibly during the developmental period, has an inhibitory action on stress-induced depression-like behaviour in male rodents.
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Affiliation(s)
- Naoki Usui
- Division of Brain and NeurophysiologyDepartment of PhysiologyJichi Medical UniversityShimotsukeJapan
- Department of Dentistry, Oral and Maxillofacial SurgeryJichi Medical UniversityShimotsukeJapan
| | - Masahide Yoshida
- Division of Brain and NeurophysiologyDepartment of PhysiologyJichi Medical UniversityShimotsukeJapan
| | - Yuki Takayanagi
- Division of Brain and NeurophysiologyDepartment of PhysiologyJichi Medical UniversityShimotsukeJapan
| | - Naranbat Nasanbuyan
- Division of Brain and NeurophysiologyDepartment of PhysiologyJichi Medical UniversityShimotsukeJapan
| | - Ayumu Inutsuka
- Division of Brain and NeurophysiologyDepartment of PhysiologyJichi Medical UniversityShimotsukeJapan
| | - Hiroshi Kurosu
- Division of Anti‐aging MedicineCenter for Molecular MedicineJichi Medical UniversityShimotsukeJapan
| | - Hiroaki Mizukami
- Division of Genetic TherapeuticsCenter for Molecular MedicineJichi Medical UniversityShimotsukeJapan
| | - Yoshiyuki Mori
- Department of Dentistry, Oral and Maxillofacial SurgeryJichi Medical UniversityShimotsukeJapan
| | - Makoto Kuro‐o
- Division of Anti‐aging MedicineCenter for Molecular MedicineJichi Medical UniversityShimotsukeJapan
| | - Tatsushi Onaka
- Division of Brain and NeurophysiologyDepartment of PhysiologyJichi Medical UniversityShimotsukeJapan
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4
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Sehara Y, Hayashi Y, Ohba K, Uchibori R, Urabe M, Inutsuka A, Shimazaki K, Kawai K, Mizukami H. Higher Transduction Efficiency of AAV5 to Neural Stem Cells and Immature Neurons in Gerbil Dentate Gyrus Compared to AAV2 and rh10. Hum Gene Ther 2021; 33:76-85. [PMID: 34348481 DOI: 10.1089/hum.2021.106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The safety and high efficiency of adeno-associated virus (AAV) vectors has facilitated their wide scale use to deliver therapeutic genes for experimental and clinical purposes in diseases affecting the central nervous system (CNS). AAV1, 2, 5, 8, 9, and rh10 are the most commonly used serotypes for CNS applications. Most AAVs are known to transduce genes predominantly into neurons. However, the precise tropism of AAVs in the dentate gyrus (DG), the region where persistent neurogenesis occurs in the adult brain, is not fully understood. We stereotaxically injected 1.5 × 1010 viral genomes of AAV2, 5, or rh10 carrying green fluorescent protein (GFP) into the right side of gerbil hippocampus, and performed immunofluorescent analysis using differentiation stage-specific markers one week after injection. We found that AAV5 showed a significantly larger number of double positive cells for GFP and Sox2 in the DG, compared to the AAV2 and rh10 groups. On the other hand, AAVrh10 presented a substantially larger number of double positive cells for GFP and NeuN in the DG, compared to AAV2 and AAV5. Our findings indicated that AAV5 showed high transduction efficiency to neural stem cells and precursor cells, while AAVrh10 showed much higher efficiency to mature neurons in the DG.
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Affiliation(s)
- Yoshihide Sehara
- Jichi Medical University, Division of Genetic Therapeutics, Center for Molecular Medicine, 3311-1 Yakushiji, Shimotsuke, Tochigi, Japan, 329-0498;
| | - Yuka Hayashi
- Jichi Medical University, Division of Genetic Therapeutics, Center for Molecular Medicine, Shimotsuke, Tochigi, Japan;
| | - Kenji Ohba
- Jichi Medical University, Division of Genetic Therapeutics, Center for Molecular Medicine, Shimotsuke, Tochigi, Japan;
| | - Ryosuke Uchibori
- Jichi Medical University, Division of Genetic Therapeutics, Center for Molecular Medicine, Shimotsuke, Tochigi, Japan;
| | - Masashi Urabe
- Jichi Medical University, Division of Genetic Therapeutics, Center for Molecular Medicine, Shimotsuke, Tochigi, Japan;
| | - Ayumu Inutsuka
- Jichi Medical University, 12838, Division of Brain and Neurophysiology, Department of Physiology, Shimotsuke, Tochigi, Japan;
| | - Kuniko Shimazaki
- Jichi Medical University, 12838, Department of Neurosurgery, Shimotsuke, Tochigi, Japan;
| | - Kensuke Kawai
- Jichi Medical University, 12838, Department of Neurosurgery, Shimotsuke, Tochigi, Japan;
| | - Hiroaki Mizukami
- Jichi Medical University, Division of Genetic Therapeutics, Center for Molecular Medicine, Shimotsuke, Tochigi, Japan;
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5
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Matsumoto M, Yoshida M, Jayathilake BW, Inutsuka A, Nishimori K, Takayanagi Y, Onaka T. Indispensable role of the oxytocin receptor for allogrooming toward socially distressed cage mates in female mice. J Neuroendocrinol 2021; 33:e12980. [PMID: 34057769 PMCID: PMC8243938 DOI: 10.1111/jne.12980] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 03/12/2021] [Accepted: 04/16/2021] [Indexed: 12/15/2022]
Abstract
Social contact reduces stress responses in social animals. Mice have been shown to show allogrooming behaviour toward distressed conspecifics. However, the precise neuronal mechanisms underlying allogrooming behaviour remain unclear. In the present study, we examined whether mice show allogrooming behaviour towards distressed conspecifics in a social defeat model and we also determined whether oxytocin receptor-expressing neurons were activated during allogrooming by examining the expression of c-Fos protein, a marker of neurone activation. Mice showed allogrooming behaviour toward socially defeated conspecifics. After allogrooming behaviour, the percentages of oxytocin receptor-expressing neurones expressing c-Fos protein were significantly increased in the anterior olfactory nucleus, cingulate cortex, insular cortex, lateral septum and medial amygdala of female mice, suggesting that oxytocin receptor-expressing neurones in these areas were activated during allogrooming behaviour toward distressed conspecifics. The duration of allogrooming was correlated with the percentages of oxytocin receptor-expressing neurones expressing c-Fos protein in the anterior olfactory nucleus, insular cortex, lateral septum and medial amygdala. In oxytocin receptor-deficient mice, allogrooming behaviour toward socially defeated cage mates was markedly reduced in female mice but not in male mice, indicating the importance of the oxytocin receptor for allogrooming behaviour in female mice toward distressed conspecifics. The results suggest that the oxytocin receptor, possibly in the anterior olfactory nucleus, insular cortex, lateral septum and/or medial amygdala, facilitates allogrooming behaviour toward socially distressed familiar conspecifics in female mice.
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Affiliation(s)
- Makiya Matsumoto
- Division of Brain and NeurophysiologyDepartment of PhysiologyJichi Medical UniversityShimotsuke‐shiTochigi‐kenJapan
| | - Masahide Yoshida
- Division of Brain and NeurophysiologyDepartment of PhysiologyJichi Medical UniversityShimotsuke‐shiTochigi‐kenJapan
| | | | - Ayumu Inutsuka
- Division of Brain and NeurophysiologyDepartment of PhysiologyJichi Medical UniversityShimotsuke‐shiTochigi‐kenJapan
| | - Katsuhiko Nishimori
- Department of Obesity and Inflammation ResearchFukushima Medical UniversityFukushima‐shiFukushima‐kenJapan
| | - Yuki Takayanagi
- Division of Brain and NeurophysiologyDepartment of PhysiologyJichi Medical UniversityShimotsuke‐shiTochigi‐kenJapan
| | - Tatsushi Onaka
- Division of Brain and NeurophysiologyDepartment of PhysiologyJichi Medical UniversityShimotsuke‐shiTochigi‐kenJapan
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6
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Kato Y, Katsumata H, Inutsuka A, Yamanaka A, Onaka T, Minami S, Orikasa C. Involvement of MCH-oxytocin neural relay within the hypothalamus in murine nursing behavior. Sci Rep 2021; 11:3348. [PMID: 33558633 PMCID: PMC7870840 DOI: 10.1038/s41598-021-82773-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Accepted: 01/21/2021] [Indexed: 12/22/2022] Open
Abstract
Multiple sequential actions, performed during parental behaviors, are essential elements of reproduction in mammalian species. We showed that neurons expressing melanin concentrating hormone (MCH) in the lateral hypothalamic area (LHA) are more active in rodents of both sexes when exhibiting parental nursing behavior. Genetic ablation of the LHA-MCH neurons impaired maternal nursing. The post-birth survival rate was lower in pups born to female mice with congenitally ablated MCH neurons under control of tet-off system, exhibiting reduced crouching behavior. Virgin female and male mice with ablated MCH neurons were less interested in pups and maternal care. Chemogenetic and optogenetic stimulation of LHA-MCH neurons induced parental nursing in virgin female and male mice. LHA-MCH GABAergic neurons project fibres to the paraventricular hypothalamic nucleus (PVN) neurons. Optogenetic stimulation of PVN induces nursing crouching behavior along with increasing plasma oxytocin levels. The hypothalamic MCH neural relays play important functional roles in parental nursing behavior in female and male mice.
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Affiliation(s)
- Yoko Kato
- Department of Bioregulation, Institute for Advanced Medical Science, Nippon Medical School, Kawasaki, 211-8533, Japan
| | - Harumi Katsumata
- Department of Bioregulation, Institute for Advanced Medical Science, Nippon Medical School, Kawasaki, 211-8533, Japan
| | - Ayumu Inutsuka
- Department of Physiology, Jichi Medical University, Shimotsuke, Tochigi, 329-0498, Japan
| | - Akihiro Yamanaka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya, 464-8601, Japan
| | - Tatsushi Onaka
- Department of Physiology, Jichi Medical University, Shimotsuke, Tochigi, 329-0498, Japan
| | - Shiro Minami
- Department of Bioregulation, Institute for Advanced Medical Science, Nippon Medical School, Kawasaki, 211-8533, Japan
| | - Chitose Orikasa
- Department of Bioregulation, Institute for Advanced Medical Science, Nippon Medical School, Kawasaki, 211-8533, Japan.
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7
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Inutsuka A, Ino D, Onaka T. Detection of neuropeptides in vivo and open questions for current and upcoming fluorescent sensors for neuropeptides. Peptides 2021; 136:170456. [PMID: 33245950 DOI: 10.1016/j.peptides.2020.170456] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 10/27/2020] [Accepted: 11/10/2020] [Indexed: 12/12/2022]
Abstract
During a stress response, various neuropeptides are secreted in a spatiotemporally coordinated way in the brain. For a precise understanding of peptide functions in a stress response, it is important to investigate when and where they are released, how they diffuse, and how they are broken down in the brain. In the past two decades, genetically encoded fluorescent calcium indicators have greatly advanced our knowledge of the functions of specific neuronal activity in regulation of behavioral changes and physiological responses during stress. In addition, various kinds of structural information on G-protein-coupled receptors (GPCRs) for neuropeptides have been revealed. Recently, genetically encoded fluorescent sensors have been developed for detection of neurotransmitters by making use of conformational changes induced by ligand binding. In this review, we summarize the recent and upcoming advances of techniques for detection of neuropeptides and then present several open questions that will be solved by application of recent or upcoming technical advances in detection of neuropeptides in vivo.
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Affiliation(s)
- Ayumu Inutsuka
- Department of Physiology, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi 329-0498, Japan.
| | - Daisuke Ino
- Department of Histology and Cell Biology, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takaramachi, Kanazawa, Ishikawa 920-8640, Japan
| | - Tatsushi Onaka
- Department of Physiology, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi 329-0498, Japan.
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Inutsuka A, Kimizuka N, Takanohashi N, Yakabu H, Onaka T. Visualization of a blue light transmission area in living animals using light-induced nuclear translocation of fluorescent proteins. Biochem Biophys Res Commun 2020; 522:138-143. [DOI: 10.1016/j.bbrc.2019.11.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Accepted: 11/03/2019] [Indexed: 10/25/2022]
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9
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Chowdhury S, Hung CJ, Izawa S, Inutsuka A, Kawamura M, Kawashima T, Bito H, Imayoshi I, Abe M, Sakimura K, Yamanaka A. Dissociating orexin-dependent and -independent functions of orexin neurons using novel Orexin-Flp knock-in mice. eLife 2019; 8:44927. [PMID: 31159922 PMCID: PMC6548533 DOI: 10.7554/elife.44927] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Accepted: 05/09/2019] [Indexed: 12/11/2022] Open
Abstract
Uninterrupted arousal is important for survival during threatening situations. Activation of orexin/hypocretin neurons is implicated in sustained arousal. However, orexin neurons produce and release orexin as well as several co-transmitters including dynorphin and glutamate. To disambiguate orexin-dependent and -independent physiological functions of orexin neurons, we generated a novel Orexin-flippase (Flp) knock-in mouse line. Crossing with Flp-reporter or Cre-expressing mice showed gene expression exclusively in orexin neurons. Histological studies confirmed that orexin was knock-out in homozygous mice. Orexin neurons without orexin showed altered electrophysiological properties, as well as received decreased glutamatergic inputs. Selective chemogenetic activation revealed that both orexin and co-transmitters functioned to increase wakefulness, however, orexin was indispensable to promote sustained arousal. Surprisingly, such activation increased the total time spent in cataplexy. Taken together, orexin is essential to maintain basic membrane properties and input-output computation of orexin neurons, as well as to exert awake-sustaining aptitude of orexin neurons.
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Affiliation(s)
- Srikanta Chowdhury
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Department of Neural Regulation, Graduate School of Medicine, Nagoya University, Nagoya, Japan.,CREST, JST, Honcho Kawaguchi, Saitama, Japan
| | - Chi Jung Hung
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Department of Neural Regulation, Graduate School of Medicine, Nagoya University, Nagoya, Japan.,CREST, JST, Honcho Kawaguchi, Saitama, Japan
| | - Shuntaro Izawa
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Department of Neural Regulation, Graduate School of Medicine, Nagoya University, Nagoya, Japan.,CREST, JST, Honcho Kawaguchi, Saitama, Japan
| | - Ayumu Inutsuka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan
| | - Meiko Kawamura
- Department of Animal Model development, Brain Research Institute, Niigata University, Niigata, Japan
| | - Takashi Kawashima
- Department of Neurochemistry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Haruhiko Bito
- Department of Neurochemistry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Itaru Imayoshi
- Research Center for Dynamic Living Systems, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Manabu Abe
- Department of Animal Model development, Brain Research Institute, Niigata University, Niigata, Japan
| | - Kenji Sakimura
- Department of Animal Model development, Brain Research Institute, Niigata University, Niigata, Japan
| | - Akihiro Yamanaka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.,Department of Neural Regulation, Graduate School of Medicine, Nagoya University, Nagoya, Japan.,CREST, JST, Honcho Kawaguchi, Saitama, Japan
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Matsui S, Sasaki T, Kohno D, Yaku K, Inutsuka A, Yokota-Hashimoto H, Kikuchi O, Suga T, Kobayashi M, Yamanaka A, Harada A, Nakagawa T, Onaka T, Kitamura T. Neuronal SIRT1 regulates macronutrient-based diet selection through FGF21 and oxytocin signalling in mice. Nat Commun 2018; 9:4604. [PMID: 30389922 PMCID: PMC6214990 DOI: 10.1038/s41467-018-07033-z] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 10/12/2018] [Indexed: 12/02/2022] Open
Abstract
Diet affects health through ingested calories and macronutrients, and macronutrient balance affects health span. The mechanisms regulating macronutrient-based diet choices are poorly understood. Previous studies had shown that NAD-dependent deacetylase sirtuin-1 (SIRT1) in part influences the health-promoting effects of caloric restriction by boosting fat use in peripheral tissues. Here, we show that neuronal SIRT1 shifts diet choice from sucrose to fat in mice, matching the peripheral metabolic shift. SIRT1-mediated suppression of simple sugar preference requires oxytocin signalling, and SIRT1 in oxytocin neurons drives this effect. The hepatokine FGF21 acts as an endocrine signal to oxytocin neurons, promoting neuronal activation and Oxt transcription and suppressing the simple sugar preference. SIRT1 promotes FGF21 signalling in oxytocin neurons and stimulates Oxt transcription through NRF2. Thus, neuronal SIRT1 contributes to the homeostatic regulation of macronutrient-based diet selection in mice.
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Affiliation(s)
- Sho Matsui
- Laboratory of Metabolic Signal, Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15 Showa-machi, Maebashi, Gunma, 371-8512, Japan
| | - Tsutomu Sasaki
- Laboratory of Metabolic Signal, Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15 Showa-machi, Maebashi, Gunma, 371-8512, Japan.
| | - Daisuke Kohno
- Laboratory of Metabolic Signal, Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15 Showa-machi, Maebashi, Gunma, 371-8512, Japan
- Advanced Scientific Research Leaders Development Unit, Gunma University, 3-39-15 Showa-machi, Maebashi, Gunma, 371-8512, Japan
| | - Keisuke Yaku
- Frontier Research Core for Life Science, University of Toyama, 2630 Sugitani, Toyama, Toyama, 930-0194, Japan
- Department of Metabolism and Nutrition, Graduate School of Medicine and Pharmaceutical Science for Research, University of Toyama, 2630 Sugitani, Toyama, Toyama, 930-0194, Japan
| | - Ayumu Inutsuka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Furocho, Nagoya, 464-8601, Japan
- Division of Brain and Neurophysiology, Department of Physiology, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan
| | - Hiromi Yokota-Hashimoto
- Laboratory of Metabolic Signal, Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15 Showa-machi, Maebashi, Gunma, 371-8512, Japan
| | - Osamu Kikuchi
- Laboratory of Metabolic Signal, Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15 Showa-machi, Maebashi, Gunma, 371-8512, Japan
| | - Takayoshi Suga
- Laboratory of Metabolic Signal, Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15 Showa-machi, Maebashi, Gunma, 371-8512, Japan
| | - Masaki Kobayashi
- Laboratory of Metabolic Signal, Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15 Showa-machi, Maebashi, Gunma, 371-8512, Japan
| | - Akihiro Yamanaka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Furocho, Nagoya, 464-8601, Japan
| | - Akihiro Harada
- Department of Cell Biology, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Takashi Nakagawa
- Frontier Research Core for Life Science, University of Toyama, 2630 Sugitani, Toyama, Toyama, 930-0194, Japan
- Department of Metabolism and Nutrition, Graduate School of Medicine and Pharmaceutical Science for Research, University of Toyama, 2630 Sugitani, Toyama, Toyama, 930-0194, Japan
| | - Tatsushi Onaka
- Division of Brain and Neurophysiology, Department of Physiology, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan
| | - Tadahiro Kitamura
- Laboratory of Metabolic Signal, Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15 Showa-machi, Maebashi, Gunma, 371-8512, Japan.
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11
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Kikusui T, Kajita M, Otsuka N, Hattori T, Kumazawa K, Watarai A, Nagasawa M, Inutsuka A, Yamanaka A, Matsuo N, Covington HE, Mogi K. Sex differences in olfactory-induced neural activation of the amygdala. Behav Brain Res 2018; 346:96-104. [DOI: 10.1016/j.bbr.2017.11.034] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 11/21/2017] [Accepted: 11/24/2017] [Indexed: 12/26/2022]
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12
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Thannickal TC, John J, Shan L, Swaab DF, Wu MF, Ramanathan L, McGregor R, Chew KT, Cornford M, Yamanaka A, Inutsuka A, Fronczek R, Lammers GJ, Worley PF, Siegel JM. Opiates increase the number of hypocretin-producing cells in human and mouse brain and reverse cataplexy in a mouse model of narcolepsy. Sci Transl Med 2018; 10:10/447/eaao4953. [PMID: 29950444 PMCID: PMC8235614 DOI: 10.1126/scitranslmed.aao4953] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 09/18/2017] [Accepted: 01/26/2018] [Indexed: 01/18/2023]
Abstract
The changes in brain function that perpetuate opiate addiction are unclear. In our studies of human narcolepsy, a disease caused by loss of immunohistochemically detected hypocretin (orexin) neurons, we encountered a control brain (from an apparently neurologically normal individual) with 50% more hypocretin neurons than other control human brains that we had studied. We discovered that this individual was a heroin addict. Studying five postmortem brains from heroin addicts, we report that the brain tissue had, on average, 54% more immunohistochemically detected neurons producing hypocretin than did control brains from neurologically normal subjects. Similar increases in hypocretin-producing cells could be induced in wild-type mice by long-term (but not short-term) administration of morphine. The increased number of detected hypocretin neurons was not due to neurogenesis and outlasted morphine administration by several weeks. The number of neurons containing melanin-concentrating hormone, which are in the same hypothalamic region as hypocretin-producing cells, did not change in response to morphine administration. Morphine administration restored the population of detected hypocretin cells to normal numbers in transgenic mice in which these neurons had been partially depleted. Morphine administration also decreased cataplexy in mice made narcoleptic by the depletion of hypocretin neurons. These findings suggest that opiate agonists may have a role in the treatment of narcolepsy, a disorder caused by hypocretin neuron loss, and that increased numbers of hypocretin-producing cells may play a role in maintaining opiate addiction.
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Affiliation(s)
- Thomas C. Thannickal
- Neuropsychiatric Institute and Brain Research Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.,Neurobiology Research, Veterans Administration Greater Los Angeles Healthcare System, 16111 Plummer Street, North Hills, CA 91343, USA
| | - Joshi John
- Neuropsychiatric Institute and Brain Research Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.,Neurobiology Research, Veterans Administration Greater Los Angeles Healthcare System, 16111 Plummer Street, North Hills, CA 91343, USA
| | - Ling Shan
- Neuropsychiatric Institute and Brain Research Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.,Neurobiology Research, Veterans Administration Greater Los Angeles Healthcare System, 16111 Plummer Street, North Hills, CA 91343, USA
| | - Dick F. Swaab
- Netherlands Institute for Neuroscience, an Institute of the Royal Netherlands Academy of Arts and Sciences, Amsterdam, Netherlands
| | - Ming-Fung Wu
- Neuropsychiatric Institute and Brain Research Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.,Neurobiology Research, Veterans Administration Greater Los Angeles Healthcare System, 16111 Plummer Street, North Hills, CA 91343, USA
| | - Lalini Ramanathan
- Neuropsychiatric Institute and Brain Research Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.,Neurobiology Research, Veterans Administration Greater Los Angeles Healthcare System, 16111 Plummer Street, North Hills, CA 91343, USA
| | - Ronald McGregor
- Neuropsychiatric Institute and Brain Research Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.,Neurobiology Research, Veterans Administration Greater Los Angeles Healthcare System, 16111 Plummer Street, North Hills, CA 91343, USA
| | - Keng-Tee Chew
- Neuropsychiatric Institute and Brain Research Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.,Neurobiology Research, Veterans Administration Greater Los Angeles Healthcare System, 16111 Plummer Street, North Hills, CA 91343, USA
| | - Marcia Cornford
- Department of Pathology, Harbor University of California, Los Angeles, Medical Center, Torrance, CA 90509, USA
| | - Akihiro Yamanaka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Ayumu Inutsuka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Rolf Fronczek
- Leiden University Medical Centre, Department of Neurology, Leiden, Netherlands.,Sleep Wake Centre, Stichting Epilepsie Instellingen Nederland, Heemstede, Netherlands
| | - Gert Jan Lammers
- Leiden University Medical Centre, Department of Neurology, Leiden, Netherlands.,Sleep Wake Centre, Stichting Epilepsie Instellingen Nederland, Heemstede, Netherlands
| | - Paul F. Worley
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Jerome M. Siegel
- Neuropsychiatric Institute and Brain Research Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.,Neurobiology Research, Veterans Administration Greater Los Angeles Healthcare System, 16111 Plummer Street, North Hills, CA 91343, USA.,Corresponding author.
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13
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Nasanbuyan N, Yoshida M, Takayanagi Y, Inutsuka A, Nishimori K, Yamanaka A, Onaka T. Oxytocin-Oxytocin Receptor Systems Facilitate Social Defeat Posture in Male Mice. Endocrinology 2018; 159:763-775. [PMID: 29186377 DOI: 10.1210/en.2017-00606] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 11/14/2017] [Indexed: 11/19/2022]
Abstract
Social stress has deteriorating effects on various psychiatric diseases. In animal models, exposure to socially dominant conspecifics (i.e., social defeat stress) evokes a species-specific defeat posture via unknown mechanisms. Oxytocin neurons have been shown to be activated by stressful stimuli and to have prosocial and anxiolytic actions. The roles of oxytocin during social defeat stress remain unclear. Expression of c-Fos, a marker of neuronal activation, in oxytocin neurons and in oxytocin receptor‒expressing neurons was investigated in mice. The projection of oxytocin neurons was examined with an anterograde viral tracer, which induces selective expression of membrane-targeted palmitoylated green fluorescent protein in oxytocin neurons. Defensive behaviors during double exposure to social defeat stress in oxytocin receptor‒deficient mice were analyzed. After social defeat stress, expression of c-Fos protein was increased in oxytocin neurons of the bed nucleus of the stria terminalis, supraoptic nucleus, and paraventricular hypothalamic nucleus. Expression of c-Fos protein was also increased in oxytocin receptor‒expressing neurons of brain regions, including the ventrolateral part of the ventromedial hypothalamus and ventrolateral periaqueductal gray. Projecting fibers from paraventricular hypothalamic oxytocin neurons were found in the ventrolateral part of the ventromedial hypothalamus and in the ventrolateral periaqueductal gray. Oxytocin receptor‒deficient mice showed reduced defeat posture during the second social defeat stress. These findings suggest that social defeat stress activates oxytocin-oxytocin receptor systems, and the findings are consistent with the view that activation of the oxytocin receptor in brain regions, including the ventrolateral part of the ventromedial hypothalamus and the ventrolateral periaqueductal gray, facilitates social defeat posture.
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Affiliation(s)
- Naranbat Nasanbuyan
- Division of Brain and Neurophysiology, Department of Physiology, Jichi Medical University, Shimotsuke-shi, Tochigi-ken, Japan
| | - Masahide Yoshida
- Division of Brain and Neurophysiology, Department of Physiology, Jichi Medical University, Shimotsuke-shi, Tochigi-ken, Japan
| | - Yuki Takayanagi
- Division of Brain and Neurophysiology, Department of Physiology, Jichi Medical University, Shimotsuke-shi, Tochigi-ken, Japan
| | - Ayumu Inutsuka
- Division of Brain and Neurophysiology, Department of Physiology, Jichi Medical University, Shimotsuke-shi, Tochigi-ken, Japan
| | - Katsuhiko Nishimori
- Laboratory of Molecular Biology, Department of Molecular and Cell Biology, Graduate School of Agricultural Science, Tohoku University, Aoba-ku, Sendai-shi, Miyagi-ken, Japan
| | - Akihiro Yamanaka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya-shi, Aichi-ken, Japan
| | - Tatsushi Onaka
- Division of Brain and Neurophysiology, Department of Physiology, Jichi Medical University, Shimotsuke-shi, Tochigi-ken, Japan
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14
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Miyamoto D, Hirai D, Fung CCA, Inutsuka A, Odagawa M, Suzuki T, Boehringer R, Adaikkan C, Matsubara C, Matsuki N, Fukai T, McHugh TJ, Yamanaka A, Murayama M. Top-down cortical input during NREM sleep consolidates perceptual memory. Science 2016; 352:1315-8. [DOI: 10.1126/science.aaf0902] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2015] [Accepted: 05/12/2016] [Indexed: 12/30/2022]
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15
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Manita S, Suzuki T, Homma C, Matsumoto T, Odagawa M, Yamada K, Ota K, Matsubara C, Inutsuka A, Sato M, Ohkura M, Yamanaka A, Yanagawa Y, Nakai J, Hayashi Y, Larkum ME, Murayama M. A Top-Down Cortical Circuit for Accurate Sensory Perception. Neuron 2015; 86:1304-16. [PMID: 26004915 DOI: 10.1016/j.neuron.2015.05.006] [Citation(s) in RCA: 217] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 12/18/2014] [Accepted: 04/21/2015] [Indexed: 02/01/2023]
Abstract
A fundamental issue in cortical processing of sensory information is whether top-down control circuits from higher brain areas to primary sensory areas not only modulate but actively engage in perception. Here, we report the identification of a neural circuit for top-down control in the mouse somatosensory system. The circuit consisted of a long-range reciprocal projection between M2 secondary motor cortex and S1 primary somatosensory cortex. In vivo physiological recordings revealed that sensory stimulation induced sequential S1 to M2 followed by M2 to S1 neural activity. The top-down projection from M2 to S1 initiated dendritic spikes and persistent firing of S1 layer 5 (L5) neurons. Optogenetic inhibition of M2 input to S1 decreased L5 firing and the accurate perception of tactile surfaces. These findings demonstrate that recurrent input to sensory areas is essential for accurate perception and provide a physiological model for one type of top-down control circuit.
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Affiliation(s)
- Satoshi Manita
- Laboratory for Behavioral Neurophysiology, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako City, Saitama, 351-0198, Japan
| | - Takayuki Suzuki
- Laboratory for Behavioral Neurophysiology, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako City, Saitama, 351-0198, Japan
| | - Chihiro Homma
- Laboratory for Behavioral Neurophysiology, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako City, Saitama, 351-0198, Japan
| | - Takashi Matsumoto
- Laboratory for Behavioral Neurophysiology, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako City, Saitama, 351-0198, Japan
| | - Maya Odagawa
- Laboratory for Behavioral Neurophysiology, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako City, Saitama, 351-0198, Japan
| | - Kazuyuki Yamada
- Laboratory for Behavioral Neurophysiology, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako City, Saitama, 351-0198, Japan
| | - Keisuke Ota
- Laboratory for Behavioral Neurophysiology, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako City, Saitama, 351-0198, Japan; JSPS Research Fellow, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo, 102-0083, Japan
| | - Chie Matsubara
- Laboratory for Behavioral Neurophysiology, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako City, Saitama, 351-0198, Japan
| | - Ayumu Inutsuka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Furocho, Chikusa-ku, Nagoya City, Aichi, 464-8601, Japan
| | - Masaaki Sato
- Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako City, Saitama, 351-0198, Japan; PRESTO, Japan Science and Technology Agency, 4-1-8 Honmachi, Kawaguchi City, Saitama, 332-0012, Japan
| | - Masamichi Ohkura
- Saitama University Graduate School of Science and Engineering, 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama, 338-8570, Japan; Saitama University Brain Science Institute, 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama, 338-8570, Japan
| | - Akihiro Yamanaka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Furocho, Chikusa-ku, Nagoya City, Aichi, 464-8601, Japan
| | - Yuchio Yanagawa
- Department of Genetic and Behavioral Neuroscience, Gunma University Graduate School of Medicine, 3-39-22 Showa-machi, Maebashi City, Gunma, 371-8511, Japan
| | - Junichi Nakai
- Saitama University Graduate School of Science and Engineering, 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama, 338-8570, Japan; Saitama University Brain Science Institute, 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama, 338-8570, Japan
| | - Yasunori Hayashi
- Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako City, Saitama, 351-0198, Japan; Saitama University Graduate School of Science and Engineering, 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama, 338-8570, Japan; Saitama University Brain Science Institute, 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama, 338-8570, Japan
| | - Matthew E Larkum
- NeuroCure Cluster of Excellence, Humboldt University, Charitéplatz 1, D-10117 Berlin, Germany
| | - Masanori Murayama
- Laboratory for Behavioral Neurophysiology, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako City, Saitama, 351-0198, Japan.
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16
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Kato HE, Kamiya M, Sugo S, Ito J, Taniguchi R, Orito A, Hirata K, Inutsuka A, Yamanaka A, Maturana AD, Ishitani R, Sudo Y, Hayashi S, Nureki O. Atomistic design of microbial opsin-based blue-shifted optogenetics tools. Nat Commun 2015; 6:7177. [PMID: 25975962 PMCID: PMC4479019 DOI: 10.1038/ncomms8177] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 04/14/2015] [Indexed: 12/31/2022] Open
Abstract
Microbial opsins with a bound chromophore function as photosensitive ion transporters and have been employed in optogenetics for the optical control of neuronal activity. Molecular engineering has been utilized to create colour variants for the functional augmentation of optogenetics tools, but was limited by the complexity of the protein-chromophore interactions. Here we report the development of blue-shifted colour variants by rational design at atomic resolution, achieved through accurate hybrid molecular simulations, electrophysiology and X-ray crystallography. The molecular simulation models and the crystal structure reveal the precisely designed conformational changes of the chromophore induced by combinatory mutations that shrink its π-conjugated system which, together with electrostatic tuning, produce large blue shifts of the absorption spectra by maximally 100 nm, while maintaining photosensitive ion transport activities. The design principle we elaborate is applicable to other microbial opsins, and clarifies the underlying molecular mechanism of the blue-shifted action spectra of microbial opsins recently isolated from natural sources.
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Affiliation(s)
- Hideaki E Kato
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Motoshi Kamiya
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Seiya Sugo
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Jumpei Ito
- Department of Bioengineering Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Reiya Taniguchi
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Ayaka Orito
- Department of Bioengineering Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | | | - Ayumu Inutsuka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan
| | - Akihiro Yamanaka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan
| | - Andrés D Maturana
- Department of Bioengineering Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Ryuichiro Ishitani
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Yuki Sudo
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Shigehiko Hayashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Osamu Nureki
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
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17
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Inutsuka A, Inui A, Tabuchi S, Tsunematsu T, Lazarus M, Yamanaka A. Concurrent and robust regulation of feeding behaviors and metabolism by orexin neurons. Neuropharmacology 2014; 85:451-60. [PMID: 24951857 DOI: 10.1016/j.neuropharm.2014.06.015] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 06/06/2014] [Accepted: 06/11/2014] [Indexed: 10/25/2022]
Abstract
Orexin neurons in the hypothalamus regulate energy homeostasis by coordinating various physiological responses. Past studies have shown the role of the orexin peptide itself; however, orexin neurons contain not only orexin but also other neurotransmitters such as glutamate and dynorphin. In this study, we examined the physiological role of orexin neurons in feeding behavior and metabolism by pharmacogenetic activation and chronic ablation. We generated novel orexin-Cre mice and utilized Cre-dependent adeno-associated virus vectors to express Gq-coupled modified GPCR, hM3Dq or diphtheria toxin fragment A in orexin neurons. By intraperitoneal injection of clozapine-N oxide in orexin-Cre mice expressing hM3Dq in orexin neurons, we could selectively manipulate the activity of orexin neurons. Pharmacogenetic stimulation of orexin neurons simultaneously increased locomotive activity, food intake, water intake and the respiratory exchange ratio (RER). Elevation of blood glucose levels and RER persisted even after locomotion and feeding behaviors returned to basal levels. Accordantly, 83% ablation of orexin neurons resulted in decreased food and water intake, while 70% ablation had almost no effect on these parameters. Our results indicate that orexin neurons play an integral role in regulation of both feeding behavior and metabolism. This regulation is so robust that greater than 80% of orexin neurons were ablated before significant changes in feeding behavior emerged.
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Affiliation(s)
- Ayumu Inutsuka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan
| | - Azusa Inui
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan
| | - Sawako Tabuchi
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan
| | - Tomomi Tsunematsu
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan
| | - Michael Lazarus
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba 305-8575, Japan
| | - Akihiro Yamanaka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan.
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18
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Nagaoka T, Ohashi R, Inutsuka A, Sakai S, Fujisawa N, Yokoyama M, Huang Y, Igarashi M, Kishi M. The Wnt/Planar Cell Polarity Pathway Component Vangl2 Induces Synapse Formation through Direct Control of N-Cadherin. Cell Rep 2014; 6:916-27. [DOI: 10.1016/j.celrep.2014.01.044] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Revised: 01/17/2014] [Accepted: 01/31/2014] [Indexed: 01/08/2023] Open
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19
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Inutsuka A, Yamanaka A. The physiological role of orexin/hypocretin neurons in the regulation of sleep/wakefulness and neuroendocrine functions. Front Endocrinol (Lausanne) 2013; 4:18. [PMID: 23508038 PMCID: PMC3589707 DOI: 10.3389/fendo.2013.00018] [Citation(s) in RCA: 114] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Accepted: 02/12/2013] [Indexed: 11/28/2022] Open
Abstract
The hypothalamus monitors body homeostasis and regulates various behaviors such as feeding, thermogenesis, and sleeping. Orexins (also known as hypocretins) were identified as endogenous ligands for two orphan G-protein-coupled receptors in the lateral hypothalamic area. They were initially recognized as regulators of feeding behavior, but they are mainly regarded as key modulators of the sleep/wakefulness cycle. Orexins activate orexin neurons, monoaminergic and cholinergic neurons in the hypothalamus/brainstem regions, to maintain a long, consolidated awake period. Anatomical studies of neural projections from/to orexin neurons and phenotypic characterization of transgenic mice revealed various roles for orexin neurons in the coordination of emotion, energy homeostasis, reward system, and arousal. For example, orexin neurons are regulated by peripheral metabolic cues, including ghrelin, leptin, and glucose concentration. This suggests that they may provide a link between energy homeostasis and arousal states. A link between the limbic system and orexin neurons might be important for increasing vigilance during emotional stimuli. Orexins are also involved in reward systems and the mechanisms of drug addiction. These findings suggest that orexin neurons sense the outer and inner environment of the body and maintain the proper wakefulness level of animals for survival. This review discusses the mechanism by which orexins maintain sleep/wakefulness states and how this mechanism relates to other systems that regulate emotion, reward, and energy homeostasis.
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Affiliation(s)
| | - Akihiro Yamanaka
- *Correspondence: Akihiro Yamanaka, Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Furo, Chikusa, Nagoya 464-8601, Japan. e-mail:
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20
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Kuroda Y, Kitada M, Wakao S, Nishikawa K, Tanimura Y, Makinoshima H, Goda M, Akashi H, Inutsuka A, Niwa A, Shigemoto T, Nabeshima Y, Nakahata T, Nabeshima YI, Fujiyoshi Y, Dezawa M. Unique multipotent cells in adult human mesenchymal cell populations. Proc Natl Acad Sci U S A 2010; 107:8639-43. [PMID: 20421459 PMCID: PMC2889306 DOI: 10.1073/pnas.0911647107] [Citation(s) in RCA: 347] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
We found adult human stem cells that can generate, from a single cell, cells with the characteristics of the three germ layers. The cells are stress-tolerant and can be isolated from cultured skin fibroblasts or bone marrow stromal cells, or directly from bone marrow aspirates. These cells can self-renew; form characteristic cell clusters in suspension culture that express a set of genes associated with pluripotency; and can differentiate into endodermal, ectodermal, and mesodermal cells both in vitro and in vivo. When transplanted into immunodeficient mice by local or i.v. injection, the cells integrated into damaged skin, muscle, or liver and differentiated into cytokeratin 14-, dystrophin-, or albumin-positive cells in the respective tissues. Furthermore, they can be efficiently isolated as SSEA-3(+) cells. Unlike authentic ES cells, their proliferation activity is not very high and they do not form teratomas in immunodeficient mouse testes. Thus, nontumorigenic stem cells with the ability to generate the multiple cell types of the three germ layers can be obtained through easily accessible adult human mesenchymal cells without introducing exogenous genes. These unique cells will be beneficial for cell-based therapy and biomedical research.
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Affiliation(s)
- Yasumasa Kuroda
- Department of Stem Cell Biology and Histology, Graduate School of Medicine, Tohoku University, Sendai 980-8575, Japan
| | - Masaaki Kitada
- Department of Stem Cell Biology and Histology, Graduate School of Medicine, Tohoku University, Sendai 980-8575, Japan
| | - Shohei Wakao
- Department of Stem Cell Biology and Histology, Graduate School of Medicine, Tohoku University, Sendai 980-8575, Japan
| | - Kouki Nishikawa
- Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Kyoto, Japan
| | - Yukihiro Tanimura
- Department of Stem Cell Biology and Histology, Graduate School of Medicine, Tohoku University, Sendai 980-8575, Japan
| | - Hideki Makinoshima
- Department of Stem Cell Biology and Histology, Graduate School of Medicine, Tohoku University, Sendai 980-8575, Japan
| | - Makoto Goda
- Japan Biological Informatics Consortium (Kyoto Branch Office), Oiwake, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hideo Akashi
- Department of Stem Cell Biology and Histology, Graduate School of Medicine, Tohoku University, Sendai 980-8575, Japan
| | - Ayumu Inutsuka
- Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Kyoto, Japan
| | - Akira Niwa
- Center for iPS Cell Research and Application, Kyoto University, Kyoto 606-8507, Japan
| | - Taeko Shigemoto
- Department of Stem Cell Biology and Histology, Graduate School of Medicine, Tohoku University, Sendai 980-8575, Japan
| | - Yoko Nabeshima
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan; and
| | - Tatsutoshi Nakahata
- Center for iPS Cell Research and Application, Kyoto University, Kyoto 606-8507, Japan
| | - Yo-ichi Nabeshima
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan; and
| | - Yoshinori Fujiyoshi
- Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Kyoto, Japan
| | - Mari Dezawa
- Department of Stem Cell Biology and Histology, Graduate School of Medicine, Tohoku University, Sendai 980-8575, Japan
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Inutsuka A, Goda M, Fujiyoshi Y. Calyculin A-induced neurite retraction is critically dependent on actomyosin activation but not on polymerization state of microtubules. Biochem Biophys Res Commun 2009; 390:1160-6. [PMID: 19857460 DOI: 10.1016/j.bbrc.2009.10.108] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2009] [Accepted: 10/21/2009] [Indexed: 11/30/2022]
Abstract
Calyculin A (CL-A), a toxin isolated from the marine sponge Discodermia calyx, is a strong inhibitor of protein phosphatase 1 (PP1) and 2A (PP2A). Although CL-A is known to induce rapid neurite retraction in developing neurons, the cytoskeletal dynamics of this retraction have remained unclear. Here, we investigated the cytoskeletal dynamics during CL-A-induced neurite retraction in cultured rat hippocampal neurons, using fluorescence microscopy as well as polarized light microscopy, which can visualize the polymerization state of the cytoskeleton in living cells. We observed that MTs were bent while maintaining their polymerization state during the neurite retraction. In addition, we also found that CL-A still induced neurite retraction when MTs were depolymerized by nocodazole or stabilized by paclitaxel. These results imply a mechanism other than depolymerization of MTs for CL-A-induced neurite retraction. Our pharmacological studies showed that blebbistatin and cytochalasin D, an inhibitor of myosin II and a depolymerizer of actin, strongly inhibited CL-A-induced neurite retraction. Based on all these findings, we propose that CL-A generates strong contractile forces by actomyosin to induce rapid neurite retraction independently from MT depolymerization.
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Affiliation(s)
- Ayumu Inutsuka
- Department of Biophysics, Graduate School of Science, Kyoto University, Oiwake, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
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