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Stanhope BA, Jaggard JB, Gratton M, Brown EB, Keene AC. Sleep Regulates Glial Plasticity and Expression of the Engulfment Receptor Draper Following Neural Injury. Curr Biol 2020; 30:1092-1101.e3. [PMID: 32142708 DOI: 10.1016/j.cub.2020.02.057] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 12/09/2019] [Accepted: 02/20/2020] [Indexed: 12/27/2022]
Abstract
Chronic sleep disturbance is associated with numerous health consequences, including neurodegenerative disease and cognitive decline [1]. Neurite damage due to apoptosis, trauma, or genetic factors is a common feature of aging, and clearance of damaged neurons is essential for maintenance of brain function. In the central nervous system, damaged neurites are cleared by Wallerian degeneration, in which activated microglia and macrophages engulf damaged neurons [2]. The fruit fly Drosophila melanogaster provides a powerful model for investigating the relationship between sleep and Wallerian degeneration [3]. Several lines of evidence suggest that glia influence sleep duration, sleep-mediated neuronal homeostasis, and clearance of toxic substances during sleep, raising the possibility that glial engulfment of damaged axons is regulated by sleep [4]. To explore this possibility, we axotomized olfactory receptor neurons and measured the effects of sleep loss or gain on the clearance of damaged neurites. Mechanical and genetic sleep deprivation impaired the clearance of damaged neurites. Conversely, treatment with the sleep-promoting drug gaboxadol accelerated clearance, while genetic induction of sleep promotes Draper expression. In sleep-deprived animals, multiple markers of glial activation were delayed, including activation of the JAK-STAT pathway, upregulation of the cell corpse engulfment receptor Draper, and innervation of the antennal lobe by glial membranes. These markers were all enhanced following genetic and pharmacological sleep induction. Taken together, these findings reveal a critical association between sleep and glial activation following neural injury, providing a platform for further investigations of the molecular mechanisms underlying sleep-dependent modulation of glial function and neurite clearance.
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Affiliation(s)
- Bethany A Stanhope
- Department of Biological Sciences, Florida Atlantic University, Jupiter, FL 33458
| | - James B Jaggard
- Department of Biological Sciences, Florida Atlantic University, Jupiter, FL 33458
| | - Melanie Gratton
- Department of Biological Sciences, Florida Atlantic University, Jupiter, FL 33458
| | - Elizabeth B Brown
- Department of Biological Sciences, Florida Atlantic University, Jupiter, FL 33458
| | - Alex C Keene
- Department of Biological Sciences, Florida Atlantic University, Jupiter, FL 33458.
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Dissel S, Morgan E, Duong V, Chan D, van Swinderen B, Shaw P, Zars T. Sleep restores place learning to the adenylyl cyclase mutant rutabaga. J Neurogenet 2020; 34:83-91. [PMID: 31997683 PMCID: PMC7250152 DOI: 10.1080/01677063.2020.1720674] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 01/20/2020] [Indexed: 01/29/2023]
Abstract
Sleep plays an important role in regulating plasticity. In Drosophila, the relationship between sleep and learning and memory has primarily focused on mushroom body dependent operant-learning assays such as aversive phototaxic suppression and courtship conditioning. In this study, sleep was increased in the classic mutant rutabaga (rut2080) and dunce (dnc1) by feeding them the GABA-A agonist gaboxadol (Gab). Performance was evaluated in each mutant in response to social enrichment and place learning, tasks that do not require the mushroom body. Gab-induced sleep did not restore behavioral plasticity to either rut2080 or dnc1 mutants following social enrichment. However, increased sleep restored place learning to rut2080 mutants. These data extend the positive effects of enhanced sleep to place learning and highlight the utility of Gab for elucidating the beneficial effects of sleep on brain functioning.
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Affiliation(s)
- Stephane Dissel
- School of Biological and Chemical Sciences, University of Missouri-Kansas City, 5007 Rockhill Rd, Kansas City, MO 64110
- Department of Neuroscience, Washington University in St. Louis, 660 S. Euclid Ave, St. Louis, Missouri, U.S.A
| | - Ellen Morgan
- Department of Neuroscience, Washington University in St. Louis, 660 S. Euclid Ave, St. Louis, Missouri, U.S.A
| | - Vincent Duong
- Department of Neuroscience, Washington University in St. Louis, 660 S. Euclid Ave, St. Louis, Missouri, U.S.A
| | - Dorothy Chan
- Department of Neuroscience, Washington University in St. Louis, 660 S. Euclid Ave, St. Louis, Missouri, U.S.A
| | - Bruno van Swinderen
- The Queensland Brain Institute, University of Queensland, Brisbane Qld 4072 Australia
| | - Paul Shaw
- Department of Neuroscience, Washington University in St. Louis, 660 S. Euclid Ave, St. Louis, Missouri, U.S.A
| | - Troy Zars
- Division of Biological Sciences, University of Missouri, Columbia, Missouri, United States of America
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Xie J, Wang D, Ling S, Yang G, Yang Y, Chen W. High-Salt Diet Causes Sleep Fragmentation in Young Drosophila Through Circadian Rhythm and Dopaminergic Systems. Front Neurosci 2019; 13:1271. [PMID: 31849585 PMCID: PMC6895215 DOI: 10.3389/fnins.2019.01271] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 11/08/2019] [Indexed: 12/21/2022] Open
Abstract
Salt (sodium chloride) is an essential dietary requirement, but excessive consumption has long-term adverse consequences. A high-salt diet (HSD) increases the risk of chronic diseases such as cardiovascular conditions and diabetes and is also associated with poor sleep quality. Little is known, however, about the neural circuit mechanisms that mediate HSD-induced sleep changes. In this study, we sought to identify the effects of HSD on the sleep and related neural circuit mechanisms of Drosophila. Strikingly, we found that HSD causes young Drosophila to exhibit a fragmented sleep phenotype similar to that of normal aging individuals. Importantly, we further showed that HSD slightly impairs circadian rhythms and that the HSD-induced sleep changes are dependent on the circadian rhythm system. In addition, we demonstrated that HSD-induced sleep changes are dopaminergic-system dependent. Together, these results provide insight into how elevated salt in the diet can affect sleep quality.
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Affiliation(s)
- Jiayu Xie
- Institute of Life Sciences, College of Biological Science and Engineering, Fuzhou University, Fuzhou, China
| | - Danfeng Wang
- Institute of Applied Ecology, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Shengan Ling
- Institute of Life Sciences, College of Biological Science and Engineering, Fuzhou University, Fuzhou, China
| | - Guang Yang
- Institute of Applied Ecology, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yufeng Yang
- Institute of Life Sciences, College of Biological Science and Engineering, Fuzhou University, Fuzhou, China
| | - Wenfeng Chen
- Institute of Life Sciences, College of Biological Science and Engineering, Fuzhou University, Fuzhou, China
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Sengupta S, Crowe LB, You S, Roberts MA, Jackson FR. A Secreted Ig-Domain Protein Required in Both Astrocytes and Neurons for Regulation of Drosophila Night Sleep. Curr Biol 2019; 29:2547-2554.e2. [PMID: 31353186 DOI: 10.1016/j.cub.2019.06.055] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 05/20/2019] [Accepted: 06/19/2019] [Indexed: 12/29/2022]
Abstract
Endogenous rhythmic behaviors are evolutionarily conserved and essential for life. In mammalian and invertebrate models, well-characterized neuronal circuits and evolutionarily conserved mechanisms regulate circadian behavior and sleep [1-4]. In Drosophila, neuronal populations located in multiple brain regions mediate arousal, sleep drive, and homeostasis (reviewed in [3, 5-7]). Similar to mammals [8], there is also evidence that fly glial cells modulate the neuronal circuits controlling rhythmic behaviors, including sleep [1]. Here, we describe a novel gene (CG14141; aka Nkt) that is required for normal sleep. NKT is a 162-amino-acid protein with a single IgC2 immunoglobulin (Ig) domain and a high-quality signal peptide [9], and we show evidence that it is secreted, similar to its C. elegans ortholog (OIG-4) [10]. We demonstrate that Nkt-null flies or those with selective knockdown in either neurons or glia have decreased and fragmented night sleep, indicative of a non-redundant requirement in both cell types. We show that Nkt is required in fly astrocytes and in a specific set of wake-promoting neurons-the mushroom body (MB) α'β' cells that link sleep to memory consolidation [11]. Importantly, Nkt gene expression is required in the adult nervous system for normal sleep, consistent with a physiological rather than developmental function for the Ig-domain protein.
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Affiliation(s)
- Sukanya Sengupta
- Department of Neuroscience, Sackler School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA 02111, USA
| | - Lauren B Crowe
- Department of Neuroscience, Sackler School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA 02111, USA
| | - Samantha You
- Department of Neuroscience, Sackler School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA 02111, USA
| | - Mary A Roberts
- Department of Neuroscience, Sackler School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA 02111, USA
| | - F Rob Jackson
- Department of Neuroscience, Sackler School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA 02111, USA.
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Cuddapah VA, Zhang SL, Sehgal A. Regulation of the Blood-Brain Barrier by Circadian Rhythms and Sleep. Trends Neurosci 2019; 42:500-510. [PMID: 31253251 PMCID: PMC6602072 DOI: 10.1016/j.tins.2019.05.001] [Citation(s) in RCA: 109] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Revised: 04/27/2019] [Accepted: 05/01/2019] [Indexed: 01/09/2023]
Abstract
The blood-brain barrier (BBB) is an evolutionarily conserved, structural, and functional separation between circulating blood and the central nervous system (CNS). By controlling permeability into and out of the nervous system, the BBB has a critical role in the precise regulation of neural processes. Here, we review recent studies demonstrating that permeability at the BBB is dynamically controlled by circadian rhythms and sleep. An endogenous circadian rhythm in the BBB controls transporter function, regulating permeability across the BBB. In addition, sleep promotes the clearance of metabolites along the BBB, as well as endocytosis across the BBB. Finally, we highlight the implications of this regulation for diseases, including epilepsy.
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Affiliation(s)
- Vishnu Anand Cuddapah
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA; Center for Sleep and Circadian Neurobiology, Chronobiology Program, and Howard Hughes Medical Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Shirley L Zhang
- Center for Sleep and Circadian Neurobiology, Chronobiology Program, and Howard Hughes Medical Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Amita Sehgal
- Center for Sleep and Circadian Neurobiology, Chronobiology Program, and Howard Hughes Medical Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA.
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Vanderheyden WM, Van Dongen HPA, Frank MG, Gerstner JR. Sleep pressure regulates mushroom body neural-glial interactions in Drosophila. ACTA ACUST UNITED AC 2019; 2019. [PMID: 31938713 DOI: 10.19185/matters.201903000008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Sleep is a behavior that exists broadly across animal phyla, from flies to humans, and is necessary for normal brain function. Recent studies in both vertebrates and invertebrates have suggested a role for glial cells in sleep regulatory processes. Changes in neural-glial interactions have been shown to be critical for synaptic plasticity and circuit function. Here, we wanted to test the hypothesis that changes in sleep pressure alters neural-glial interactions. In the fruit fly, Drosophila melanogaster, sleep is known to be regulated by mushroom body (MB) circuits. We used the technique GFP Reconstitution Across Synaptic Partners (GRASP) to test whether changes in sleep pressure affect neural-glial interactions between MB neurons and astrocytes, a specialized glial cell type known to regulate sleep in flies and mammals. The MB-astrocyte GRASP signal was reduced after 24 h of sleep deprivation, whereas the signal returned to baseline levels following 72 h of recovery. Social enrichment, which increases sleep drive, similarly reduced the MB-astrocyte GRASP signal. We did not observe any changes in the MB-astrocyte GRASP signal over time-of-day, or following paraquat exposure or starvation. These data suggest that changes in sleep pressure are linked to dynamic changes in neural-glial interactions between astrocytes and neuronal sleep circuits, which are not caused by normal rest-activity cycles or stressors.
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Affiliation(s)
- William M Vanderheyden
- Biomedical Sciences, Washington State University - Elson S. Floyd College of Medicine; Sleep and Performance Research Center, Washington State University - Elson S. Floyd College of Medicine
| | - Hans P A Van Dongen
- Biomedical Sciences, Washington State University - Elson S. Floyd College of Medicine; Sleep and Performance Research Center, Washington State University - Elson S. Floyd College of Medicine
| | - Marcos G Frank
- Biomedical Sciences, Washington State University - Elson S. Floyd College of Medicine; Sleep and Performance Research Center, Washington State University - Elson S. Floyd College of Medicine
| | - Jason R Gerstner
- Biomedical Sciences, Washington State University - Elson S. Floyd College of Medicine; Sleep and Performance Research Center, Washington State University - Elson S. Floyd College of Medicine
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