1
|
Runyon K, Bui T, Mazanek S, Hartle A, Marschalko K, Howe WM. Distinct cholinergic circuits underlie discrete effects of reward on attention. Front Mol Neurosci 2024; 17:1429316. [PMID: 39268248 PMCID: PMC11390659 DOI: 10.3389/fnmol.2024.1429316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Accepted: 08/01/2024] [Indexed: 09/15/2024] Open
Abstract
Attention and reward are functions that are critical for the control of behavior, and massive multi-region neural systems have evolved to support the discrete computations associated with each. Previous research has also identified that attention and reward interact, though our understanding of the neural mechanisms that mediate this interplay is incomplete. Here, we review the basic neuroanatomy of attention, reward, and cholinergic systems. We then examine specific contexts in which attention and reward computations interact. Building on this work, we propose two discrete neural circuits whereby acetylcholine, released from cell groups located in different parts of the brain, mediates the impact of stimulus-reward associations as well as motivation on attentional control. We conclude by examining these circuits as a potential shared loci of dysfunction across diseases states associated with deficits in attention and reward.
Collapse
Affiliation(s)
- Kelly Runyon
- School of Neuroscience at Virginia Tech, Blacksburg, VA, United States
| | - Tung Bui
- School of Neuroscience at Virginia Tech, Blacksburg, VA, United States
| | - Sarah Mazanek
- School of Neuroscience at Virginia Tech, Blacksburg, VA, United States
| | - Alec Hartle
- School of Neuroscience at Virginia Tech, Blacksburg, VA, United States
| | - Katie Marschalko
- School of Neuroscience at Virginia Tech, Blacksburg, VA, United States
| | | |
Collapse
|
2
|
Grujic N, Polania R, Burdakov D. Neurobehavioral meaning of pupil size. Neuron 2024:S0896-6273(24)00406-9. [PMID: 38925124 DOI: 10.1016/j.neuron.2024.05.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 03/22/2024] [Accepted: 05/31/2024] [Indexed: 06/28/2024]
Abstract
Pupil size is a widely used metric of brain state. It is one of the few signals originating from the brain that can be readily monitored with low-cost devices in basic science, clinical, and home settings. It is, therefore, important to investigate and generate well-defined theories related to specific interpretations of this metric. What exactly does it tell us about the brain? Pupils constrict in response to light and dilate during darkness, but the brain also controls pupil size irrespective of luminosity. Pupil size fluctuations resulting from ongoing "brain states" are used as a metric of arousal, but what is pupil-linked arousal and how should it be interpreted in neural, cognitive, and computational terms? Here, we discuss some recent findings related to these issues. We identify open questions and propose how to answer them through a combination of well-defined tasks, neurocomputational models, and neurophysiological probing of the interconnected loops of causes and consequences of pupil size.
Collapse
Affiliation(s)
- Nikola Grujic
- Neurobehavioural Dynamics Lab, ETH Zürich, Department of Health Sciences and Technology, Schorenstrasse 16, 8603 Schwerzenbach, Switzerland.
| | - Rafael Polania
- Decision Neuroscience Lab, ETH Zürich, Department of Health Sciences and Technology, Winterthurstrasse 190, 8057 Zürich, Switzerland
| | - Denis Burdakov
- Neurobehavioural Dynamics Lab, ETH Zürich, Department of Health Sciences and Technology, Schorenstrasse 16, 8603 Schwerzenbach, Switzerland.
| |
Collapse
|
3
|
Moscatelli F, Monda A, Messina A, Monda M, Monda V, Villano I, De Maria A, Nicola M, Marsala G, de Stefano MI, Limone P, Messina G, Polito R. Evaluation of Orexin-A Salivary Levels and its Correlation with Attention After Non-invasive Brain Stimulation in Female Volleyball Players. SPORTS MEDICINE - OPEN 2024; 10:32. [PMID: 38573446 PMCID: PMC10994895 DOI: 10.1186/s40798-024-00698-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Accepted: 03/12/2024] [Indexed: 04/05/2024]
Abstract
BACKGROUND The capacity to change attention from one area to another depending on the many environmental circumstances present is a crucial aspect of selective attention and is strictly correlated to reaction time. The cholinergic system of the basal forebrain is crucial for attentive abilities. Several inputs, particularly orexin neurons, whose cell bodies are found in the postero-lateral hypothalamus, can activate the cholinergic system. The aim of this study was to investigate if high frequencies rTMS at dorsolateral prefrontal cortex (DLPFC) in highly trained volleyball players can change Orexin-A levels, attention and reaction time. This study was a double-blinded (participant and evaluator) matched-pair experimental design. Twenty right-handed female volleyball players were recruited for the study (age 24.6 ± 2.7 years; height 177.0 ± 5.5 cm; body mass 67.5 ± 6.5 kg; BMI 21.5 ± 1.2). RESULTS The main finding of this study was that 10 Hz rTMS to the DLPFC seems to increase Orexin-A salivary levels and the percentage of correct answers, while decreasing RT. After rTMS, the athletes show an increase in the percentage of correct answers immediately after the end of stimulation, and also after 15 and 30 min. Moreover, the athletes show decreases in reaction time after the end of stimulation and after 15 and 30 min to the end of stimulation, while no differences were found at the end of stimulation. Finally, the athletes show significant increases in Orexin-A salivary levels after stimulation with a peak after 30' of the end. CONCLUSION The results of our study seem to indicate that there is a relationship between salivary Orexin-A levels and RT. These results could provide useful tools for modulating sports training; in fact, if confirmed, they could lead coaches to offer their athletes rTMS sessions appropriately integrated with training. In fact, alternating attention is a mental flexibility that enables people to change their point of focus and switch between tasks requiring various levels of cognition.
Collapse
Affiliation(s)
- Fiorenzo Moscatelli
- Department of Wellbeing, Nutrition and Sport, Pegaso Telematic University, Naples, Italy
| | - Antonietta Monda
- Department of Human Science and Quality of Life Promotion, San Raffaele Telematic University, Rome, Italy
| | - Antonietta Messina
- Department of Experimental Medicine, Section of Human Physiology and Unit of Dietetics and Sports Medicine, Università degli Studi della Campania "Luigi Vanvitelli", Naples, Italy
| | - Marcellino Monda
- Department of Experimental Medicine, Section of Human Physiology and Unit of Dietetics and Sports Medicine, Università degli Studi della Campania "Luigi Vanvitelli", Naples, Italy
| | - Vincenzo Monda
- Department of Movement Sciences and Wellbeing, University of Naples "Parthenope", Naples, Italy
| | - Ines Villano
- Department of Wellbeing, Nutrition and Sport, Pegaso Telematic University, Naples, Italy
| | - Antonella De Maria
- Department of Experimental Medicine, Section of Human Physiology and Unit of Dietetics and Sports Medicine, Università degli Studi della Campania "Luigi Vanvitelli", Naples, Italy
| | - Mancini Nicola
- Faculty of Physical Education and Sports, "Babes Bolyai" University, Cluj-Napoca, Italy
| | - Gabriella Marsala
- Faculty of Physical Education and Sports, "Babes Bolyai" University, Cluj-Napoca, Italy
- Drug's Department, ASP Catania, Catania, Italy
| | - Maria Ida de Stefano
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Pierpaolo Limone
- Department of Psychology and Education, Pegaso Telematic University, Naples, Italy
| | - Giovanni Messina
- Department of Human Science and Quality of Life Promotion, San Raffaele Telematic University, Rome, Italy.
- Department of Experimental Medicine, Section of Human Physiology and Unit of Dietetics and Sports Medicine, Università degli Studi della Campania "Luigi Vanvitelli", Naples, Italy.
| | - Rita Polito
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| |
Collapse
|
4
|
Pintwala SK, Peever J. Brain Circuits Underlying Narcolepsy. Neuroscientist 2023; 29:751-766. [PMID: 34704497 DOI: 10.1177/10738584211052263] [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] [Indexed: 11/17/2022]
Abstract
Narcolepsy is a sleep disorder manifesting symptoms such as excessive daytime sleepiness and often cataplexy, a sudden and involuntary loss of muscle activity during wakefulness. The underlying neuropathological basis of narcolepsy is the loss of orexin neurons from the lateral hypothalamus. To date numerous animal models of narcolepsy have been produced in the laboratory, being invaluable tools for delineating the brain circuits of narcolepsy. This review will examine the evidence regarding the function of the orexin system, and how loss of this wake-promoting system manifests in excessive daytime sleepiness. This review will also outline the brain circuits controlling cataplexy, focusing on the contribution of orexin signaling loss in narcolepsy. Although our understanding of the brain circuits of narcolepsy has made great progress in recent years, much remains to be understood.
Collapse
Affiliation(s)
| | - John Peever
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada
| |
Collapse
|
5
|
Feldmeyer D. Structure and function of neocortical layer 6b. Front Cell Neurosci 2023; 17:1257803. [PMID: 37744882 PMCID: PMC10516558 DOI: 10.3389/fncel.2023.1257803] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 08/14/2023] [Indexed: 09/26/2023] Open
Abstract
Cortical layer 6b is considered by many to be a remnant of the subplate that forms during early stages of neocortical development, but its role in the adult is not well understood. Its neuronal complement has only recently become the subject of systematic studies, and its axonal projections and synaptic input structures have remained largely unexplored despite decades of research into neocortical function. In recent years, however, layer 6b (L6b) has attracted increasing attention and its functional role is beginning to be elucidated. In this review, I will attempt to provide an overview of what is currently known about the excitatory and inhibitory neurons in this layer, their pre- and postsynaptic connectivity, and their functional implications. Similarities and differences between different cortical areas will be highlighted. Finally, layer 6b neurons are highly responsive to several neuropeptides such as orexin/hypocretin, neurotensin and cholecystokinin, in some cases exclusively. They are also strongly controlled by neurotransmitters such as acetylcholine and norepinephrine. The interaction of these neuromodulators with L6b microcircuitry and its functional consequences will also be discussed.
Collapse
Affiliation(s)
- Dirk Feldmeyer
- Research Centre Jülich, Institute of Neuroscience and Medicine 10 (INM-10), Jülich, Germany
- Department of Psychiatry, Psychotherapy, and Psychosomatics, RWTH Aachen University Hospital, Aachen, Germany
- Jülich-Aachen Research Alliance, Translational Brain Medicine (JARA Brain), Aachen, Germany
| |
Collapse
|
6
|
Maness EB, Blumenthal SA, Burk JA. Dual orexin/hypocretin receptor antagonism attenuates NMDA receptor hypofunction-induced attentional impairments in a rat model of schizophrenia. Behav Brain Res 2023; 450:114497. [PMID: 37196827 PMCID: PMC10330488 DOI: 10.1016/j.bbr.2023.114497] [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: 02/14/2023] [Revised: 05/12/2023] [Accepted: 05/14/2023] [Indexed: 05/19/2023]
Abstract
Schizophrenia is a neuropsychiatric condition that is associated with impaired attentional processing and performance. Failure to support increasing attentional load may result, in part, from inhibitory failure in attention-relevant cortical regions, and available antipsychotics often fail to address this issue. Orexin/hypocretin receptors are found throughout the brain and are expressed on neurons relevant to both attention and schizophrenia, highlighting them as a potential target to treat schizophrenia-associated attentional dysfunction. In the present experiment, rats (N = 14) trained in a visual sustained attention task that required discrimination of trials which presented a visual signal from trials during which no signal was presented. Once trained, rats were then co-administered the psychotomimetic N-methyl-D-aspartate (NMDA) receptor antagonist dizocilpine (MK-801: 0 or 0.1 mg/kg, intraperitoneal injections) and the dual orexin receptor antagonist filorexant (MK-6096: 0, 0.1, or 1 mM, intracerebroventricular infusions) prior to task performance across six sessions. Dizocilpine impaired overall accuracy during signal trials, slowed reaction times for correctly-responded trials, and increased the number of omitted trials throughout the task. Dizocilpine-induced increases in signal trial deficits, correct response latencies, and errors of omission were reduced following infusions of the 0.1 mM, but not 1 mM, dose of filorexant. As such, orexin receptor blockade may improve attentional deficits in a state of NMDA receptor hypofunction.
Collapse
Affiliation(s)
- Eden B Maness
- Department of Psychological Sciences, College of William and Mary, Williamsburg, VA 23187, USA; VA Boston Healthcare System and Department of Psychiatry, Harvard Medical School, West Roxbury, MA 02132, USA.
| | - Sarah A Blumenthal
- Center for Translational Social Neuroscience, Emory National Primate Research Center, Emory University, Atlanta, GA 30329, USA
| | - Joshua A Burk
- Department of Psychological Sciences, College of William and Mary, Williamsburg, VA 23187, USA
| |
Collapse
|
7
|
Maness EB, Blumenthal SA, Burk JA. Dual orexin/hypocretin receptor antagonism attenuates attentional impairments in an NMDA receptor hypofunction model of schizophrenia. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.02.05.527043. [PMID: 36778441 PMCID: PMC9915718 DOI: 10.1101/2023.02.05.527043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Schizophrenia is a neuropsychiatric condition that is associated with impaired attentional processing and performance. Failure to support increasing attentional load may result, in part, from abnormally overactive basal forebrain projections to the prefrontal cortex, and available antipsychotics often fail to address this issue. Orexin/hypocretin receptors are expressed on corticopetal cholinergic neurons, and their blockade has been shown to decrease the activity of cortical basal forebrain outputs and prefrontal cortical cholinergic neurotransmission. In the present experiment, rats (N = 14) trained in a visual sustained attention task that required discrimination of trials which presented a visual signal from trials during which no signal was presented. Once trained, rats were then co-administered the psychotomimetic N-methyl-D-aspartate (NMDA) receptor antagonist dizocilpine (MK-801: 0 or 0.1 mg/kg, intraperitoneal injections) and the dual orexin receptor antagonist filorexant (MK-6096: 0, 0.1, or 1 mM, intracerebroventricular infusions) prior to task performance across six sessions. Dizocilpine impaired overall accuracy during signal trials, slowed reaction times for correctly-responded trials, and increased the number of omitted trials throughout the task. Dizocilpine-induced increases in signal trial deficits, correct response latencies, and errors of omission were reduced following infusions of the 0.1 mM, but not 1 mM, dose of filorexant. Orexin receptor blockade, perhaps through anticholinergic mechanisms, may improve attentional deficits in a state of NMDA receptor hypofunction. Highlights Schizophrenia is associated with attentional deficits that may stem from abnormally reactive BF projections to the prefrontal cortexOrexin receptor antagonists decrease acetylcholine release and reduce prefrontal cortical activityThe dual orexin receptor antagonist filorexant alleviated impairments of attention following NMDA receptor blockade.
Collapse
Affiliation(s)
- Eden B. Maness
- VA Boston Healthcare System and Department of Psychiatry, Harvard Medical School, West Roxbury, MA, 02132, USA
- Department of Psychological Sciences, College of William and Mary, Williamsburg, VA, 23187, USA
| | - Sarah A. Blumenthal
- Center for Translational Social Neuroscience, Emory National Primate Research Center, Emory University, Atlanta, GA, 30329, USA
| | - Joshua A. Burk
- Department of Psychological Sciences, College of William and Mary, Williamsburg, VA, 23187, USA
| |
Collapse
|
8
|
Ishioh M, Nozu T, Miyagishi S, Igarashi S, Funayama T, Ohhira M, Okumura T. Activation of basal forebrain cholinergic neurons improves colonic hyperpermeability through the vagus nerve and adenosine A2B receptors in rats. Biochem Pharmacol 2022; 206:115331. [PMID: 36330948 DOI: 10.1016/j.bcp.2022.115331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 10/20/2022] [Accepted: 10/24/2022] [Indexed: 12/14/2022]
Abstract
Intestinal barrier dysfunction, a leaky gut, contributes to the pathophysiology of various diseases such as dementia and irritable bowel syndrome (IBS). We recently clarified that orexin, ghrelin, or adenosine A2B signaling in the brain improved leaky gut through the vagus nerve. The present study was performed to clarify whether basal forebrain cholinergic neurons (BFCNs) are implicated in the central regulation of intestinal barrier function. We activated BFCNs using benzyl quinolone carboxylic acid (BQCA), a positive muscarinic M1 allosteric modulator, and evaluated colonic permeability by quantifying the absorbed Evans blue in rat colonic tissue. Intracisternal (not intraperitoneal) injection of BQCA blocked the increased colonic permeability in response to lipopolysaccharide. Vagotomy blocked BQCA-induced improvement of colonic hyperpermeability. Intracisternally administered pirenzepine, a muscarinic M1 selective antagonist, prevented intestinal barrier function improvement by intravenously administered 2-deoxy-d-glucose, central vagal stimulant. Adenosine A2B receptor antagonist but not dopamine or opioid receptor antagonist prevented BQCA-induced blockade of colonic hyperpermeability. Additionally, intracisternal injection of pirenzepine blocked orexin- or butyrate-induced intestinal barrier function improvement. These results suggest that BFCNs improve leaky gut through adenosine A2B signaling and the vagal pathway. Furthermore, BFCNs mediate orexin- or butyrate-induced intestinal barrier function improvement. Since BFCNs play a role in cognitive function and a leaky gut is associated with dementia, the present finding may lead us to speculate that BFCNs are involved in the development of dementia by regulating intestinal barrier function.
Collapse
Affiliation(s)
- Masatomo Ishioh
- Division of Metabolism, Biosystemic Science, Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Japan; Department of General Medicine, Asahikawa Medical University, Japan.
| | - Tsukasa Nozu
- Department of Regional Medicine and Education, Asahikawa Medical University, Japan
| | - Saori Miyagishi
- Department of General Medicine, Asahikawa Medical University, Japan
| | - Sho Igarashi
- Division of Metabolism, Biosystemic Science, Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Japan
| | - Takuya Funayama
- Division of Metabolism, Biosystemic Science, Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Japan
| | - Masumi Ohhira
- Department of General Medicine, Asahikawa Medical University, Japan
| | - Toshikatsu Okumura
- Division of Metabolism, Biosystemic Science, Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Japan; Department of General Medicine, Asahikawa Medical University, Japan; Center for Medical Education, Asahikawa Medical University, Japan
| |
Collapse
|
9
|
You WR, Lin LC, Lin WC, Tsai MC. Differences in orexin-A level in the functional brain network of HUD patients undergoing harm reduction therapy. Medicine (Baltimore) 2022; 101:e30093. [PMID: 35984180 PMCID: PMC9387983 DOI: 10.1097/md.0000000000030093] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Orexins regulate the reward-seeking pathway and also play a role in drug addiction. The aim of this study was an investigation of the changes in serum level of orexin-A as well as changes in the functional brain network in heroin use disorder (HUD) patients undergoing harm reduction therapy (HRT). Twenty-five HUD patients undergoing HRT that included methadone and buprenorphine, and 31 healthy control (HC) subjects, were enrolled for this study. Serum orexin-A levels and brain-derived neurotrophic factor were measured with assay kits. The functional brain network in HUD patients and HC was investigated and assessed using seed-based analysis and functional brain MRI scans. t Tested orexin-A levels were found to be significantly higher in HUD patients undergoing HRT than in HCs (P < .05). Analysis showed the functional activity of the right ventral anterior insula (RVAI) in HUD patients to be significantly lower than in HCs (P < .05, Family-Wise Error) corrected). In addition, the internetwork functional connectivity was significantly lower in the left nucleus accumbens and left dorsal anterior insula in the HUD subjects than in HCs (P < .05, Family-Wise Error corrected). In this study, no significant correlation between orexin-A levels and functional brain networks was found. However, the results suggest that HRT might increase orexin-A levels and decrease functional activity in RVAI in HUD patients.
Collapse
Affiliation(s)
- Wan-Ru You
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital, and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Liang-Chun Lin
- Department of Radiation Oncology, China Medical University Hospital, Taichung, Taiwan
| | - Wei-Che Lin
- Department of Diagnostic Radiology, Kaohsiung Chang Gung Memorial Hospital, and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Meng-Chang Tsai
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital, and Chang Gung University College of Medicine, Kaohsiung, Taiwan
- *Correspondence: Meng-Chang Tsai, Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital, and Chang Gung University College of Medicine, Kaohsiung, 123 Ta-Pei Road, Niao-Sung, Kaohsiung 83305, Taiwan (e-mail: )
| |
Collapse
|
10
|
Villano I, La Marra M, Di Maio G, Monda V, Chieffi S, Guatteo E, Messina G, Moscatelli F, Monda M, Messina A. Physiological Role of Orexinergic System for Health. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:8353. [PMID: 35886210 PMCID: PMC9323672 DOI: 10.3390/ijerph19148353] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 07/03/2022] [Accepted: 07/05/2022] [Indexed: 02/06/2023]
Abstract
Orexins, or hypocretins, are excitatory neuropeptides involved in the regulation of feeding behavior and the sleep and wakefulness states. Since their discovery, several lines of evidence have highlighted that orexin neurons regulate a great range of physiological functions, giving it the definition of a multitasking system. In the present review, we firstly describe the mechanisms underlining the orexin system and their interactions with the central nervous system (CNS). Then, the system's involvement in goal-directed behaviors, sleep/wakefulness state regulation, feeding behavior and energy homeostasis, reward system, and aging and neurodegenerative diseases are described. Advanced evidence suggests that the orexin system is crucial for regulating many physiological functions and could represent a promising target for therapeutical approaches to obesity, drug addiction, and emotional stress.
Collapse
Affiliation(s)
- Ines Villano
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (M.L.M.); (G.D.M.); (S.C.); (M.M.); (A.M.)
| | - Marco La Marra
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (M.L.M.); (G.D.M.); (S.C.); (M.M.); (A.M.)
| | - Girolamo Di Maio
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (M.L.M.); (G.D.M.); (S.C.); (M.M.); (A.M.)
| | - Vincenzo Monda
- Department of Movement Sciences and Wellbeing, University of Naples “Parthenope”, 80138 Naples, Italy; (V.M.); (E.G.)
| | - Sergio Chieffi
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (M.L.M.); (G.D.M.); (S.C.); (M.M.); (A.M.)
| | - Ezia Guatteo
- Department of Movement Sciences and Wellbeing, University of Naples “Parthenope”, 80138 Naples, Italy; (V.M.); (E.G.)
| | - Giovanni Messina
- Department of Clinical and Experimental Medicine, University of Foggia, 71100 Foggia, Italy; (G.M.); (F.M.)
| | - Fiorenzo Moscatelli
- Department of Clinical and Experimental Medicine, University of Foggia, 71100 Foggia, Italy; (G.M.); (F.M.)
| | - Marcellino Monda
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (M.L.M.); (G.D.M.); (S.C.); (M.M.); (A.M.)
| | - Antonietta Messina
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy; (M.L.M.); (G.D.M.); (S.C.); (M.M.); (A.M.)
| |
Collapse
|
11
|
Kaplan GB, Lakis GA, Zhoba H. Sleep-Wake and Arousal Dysfunctions in Post-Traumatic Stress Disorder:Role of Orexin Systems. Brain Res Bull 2022; 186:106-122. [PMID: 35618150 DOI: 10.1016/j.brainresbull.2022.05.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 04/20/2022] [Accepted: 05/10/2022] [Indexed: 12/15/2022]
Abstract
Post-traumatic stress disorder (PTSD) is a trauma-related condition that produces distressing fear memory intrusions, avoidance behaviors, hyperarousal/startle, stress responses and insomnia. This review focuses on the importance of the orexin neural system as a novel mechanism related to the pathophysiology of PTSD. Orexinergic neurons originate in the lateral hypothalamus and project widely to key neurotransmitter system neurons, autonomic neurons, the hypothalamic-pituitaryadrenal (HPA) axis, and fear-related neural circuits. After trauma or stress, the basolateral amygdala (BLA) transmits sensory information to the central nucleus of the amygdala (CeA) and in turn to the hypothalamus and other subcortical and brainstem regions to promote fear and threat. Orexin receptors have a prominent role in this circuit as fear conditioned orexin receptor knockout mice show decreased fear expression while dual orexin receptor antagonists (DORAs) inhibit fear acquisition and expression. Orexin activation of an infralimbic-amygdala circuit impedes fear extinction while DORA treatments enhance it. Increased orexin signaling to the amygdalocortical- hippocampal circuit promotes avoidance behaviors. Orexin has an important role in activating sympathetic nervous system (SNS) activity and the HPA axis stress responses. Blockade of orexin receptors reduces fear-conditioned startle responses. In PTSD models, individuals demonstrate sleep disturbances such as increased sleep latency and more transitions to wakefulness. Increased orexin activity impairs sleep by promoting wakefulness and reducing total sleep time while DORA treatments enhance sleep onset and maintenance. The orexinergic neural system provides important mechanisms for understanding multiple PTSD behaviors and provides new medication targets to treat this often persistent and debilitating illness.
Collapse
Affiliation(s)
- Gary B Kaplan
- Mental Health Service, VA Boston Healthcare System, West Roxbury, MA, 02132 USA; Department of Psychiatry, Boston University School of Medicine, Boston, MA, 02118 USA; Department of Pharmacology and Experimental Therapeutics, Boston University School of Medicine, Boston, MA, 02118 USA.
| | - Gabrielle A Lakis
- Research Service, VA Boston Healthcare System, West Roxbury, MA, 02132 USA; Undergraduate Program in Neuroscience, Boston University, Boston, MA, 02215 USA
| | - Hryhoriy Zhoba
- Research Service, VA Boston Healthcare System, West Roxbury, MA, 02132 USA
| |
Collapse
|
12
|
Gao F, Liu T, Tuo M, Chi S. The role of orexin in Alzheimer disease: From sleep-wake disturbance to therapeutic target. Neurosci Lett 2021; 765:136247. [PMID: 34530113 DOI: 10.1016/j.neulet.2021.136247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 08/01/2021] [Accepted: 09/09/2021] [Indexed: 10/20/2022]
Abstract
Accumulating evidence has shown that sleep disturbance is a common symptom in Alzheimer's disease (AD), which is regarded as a modifiable risk factor for AD. Orexin is a key modulator of the sleep-wake cycle and has been found to be dysregulated in AD patients. The increased orexin in cerebrospinal fluid (CSF) is associated with decreased sleep efficiency and REM sleep, as well as cognitive impairment in AD patients. The orexin system has profuse projections to brain regions that are implicated in arousal and cognition and has been found to participate in the progression of AD pathology. Conversely the orexin receptor antagonists are able to consolidate sleep and reduce AD pathology. Therefore, improved understanding of the mechanisms linking orexin system, sleep disturbance and AD could make orexin receptor antagonists a promising target for the prevention or treatment of AD.
Collapse
Affiliation(s)
- Fan Gao
- Department of Neurology, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Tao Liu
- Department of Neurology, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Miao Tuo
- Department of Neurology, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Song Chi
- Department of Neurology, the Affiliated Hospital of Qingdao University, Qingdao, China.
| |
Collapse
|
13
|
Zegarra-Valdivia JA, Chaves-Coira I, Fernandez de Sevilla ME, Martinez-Rachadell L, Esparza J, Torres-Aleman I, Nuñez A. Reduced Insulin-Like Growth Factor-I Effects in the Basal Forebrain of Aging Mouse. Front Aging Neurosci 2021; 13:682388. [PMID: 34539376 PMCID: PMC8442768 DOI: 10.3389/fnagi.2021.682388] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 06/28/2021] [Indexed: 11/25/2022] Open
Abstract
It is known that aging is frequently accompanied by a decline in cognition. Furthermore, aging is associated with lower serum IGF-I levels that may contribute to this deterioration. We studied the effect of IGF-I in neurons of the horizontal diagonal band of Broca (HDB) of young (≤6 months old) and old (≥20-month-old) mice to determine if changes in the response of these neurons to IGF-I occur along with aging. Local injection of IGF-I in the HDB nucleus increased their neuronal activity and induced fast oscillatory activity in the electrocorticogram (ECoG). Furthermore, IGF-I facilitated tactile responses in the primary somatosensory cortex elicited by air-puffs delivered in the whiskers. These excitatory effects decreased in old mice. Immunohistochemistry showed that cholinergic HDB neurons express IGF-I receptors and that IGF-I injection increased the expression of c-fos in young, but not in old animals. IGF-I increased the activity of optogenetically-identified cholinergic neurons in young animals, suggesting that most of the IGF-I-induced excitatory effects were mediated by activation of these neurons. Effects of aging were partially ameliorated by chronic IGF-I treatment in old mice. The present findings suggest that reduced IGF-I activity in old animals participates in age-associated changes in cortical activity.
Collapse
Affiliation(s)
- Jonathan A Zegarra-Valdivia
- Cajal Institute (CSIC), Madrid, Spain.,CIBERNED, Madrid, Spain.,Universidad Nacional de San Agustín de Arequipa, Arequipa, Peru.,Achucarro Basque Center for Neuroscience, Leioa, Spain
| | - Irene Chaves-Coira
- Department of Anatomy, Histology and Neurosciences, Universidad Autónoma de Madrid, Madrid, Spain
| | | | | | | | - Ignacio Torres-Aleman
- Cajal Institute (CSIC), Madrid, Spain.,CIBERNED, Madrid, Spain.,Achucarro Basque Center for Neuroscience, Leioa, Spain
| | - Angel Nuñez
- Department of Anatomy, Histology and Neurosciences, Universidad Autónoma de Madrid, Madrid, Spain
| |
Collapse
|
14
|
Abstract
Twenty-two years after their discovery, the hypocretins (Hcrts), also known as orexins, are two of the most studied peptidergic systems, involved in myriad physiological systems that range from sleep, arousal, motivation, homeostatic regulation, fear, anxiety and learning. A causal relationship between activity of Hcrt and arousal stability was established shortly after their discovery and have led to the development of a new class of drugs to treat insomnia. In this review we discuss the many faces of the Hcrt system and examine recent findings that implicate decreased Hcrt function in the pathogenesis of a number of neuropsychiatric conditions. We also discuss future therapeutic strategies to replace or enhance Hcrt function as a treatment option for these neuropsychiatric conditions.
Collapse
Affiliation(s)
- Erica Seigneur
- Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA
| | - Luis de Lecea
- Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA
| |
Collapse
|
15
|
Li SB, de Lecea L. The hypocretin (orexin) system: from a neural circuitry perspective. Neuropharmacology 2020; 167:107993. [PMID: 32135427 DOI: 10.1016/j.neuropharm.2020.107993] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 01/23/2020] [Accepted: 02/05/2020] [Indexed: 12/11/2022]
Abstract
Hypocretin/orexin neurons are distributed restrictively in the hypothalamus, a brain region known to orchestrate diverse functions including sleep, reward processing, food intake, thermogenesis, and mood. Since the hypocretins/orexins were discovered more than two decades ago, extensive studies have accumulated concrete evidence showing the pivotal role of hypocretin/orexin in diverse neural modulation. New method of viral-mediated tracing system offers the possibility to map the monosynaptic inputs and detailed anatomical connectivity of Hcrt neurons. With the development of powerful research techniques including optogenetics, fiber-photometry, cell-type/pathway specific manipulation and neuronal activity monitoring, as well as single-cell RNA sequencing, the details of how hypocretinergic system execute functional modulation of various behaviors are coming to light. In this review, we focus on the function of neural pathways from hypocretin neurons to target brain regions. Anatomical and functional inputs to hypocretin neurons are also discussed. We further briefly summarize the development of pharmaceutical compounds targeting hypocretin signaling. This article is part of the special issue on Neuropeptides.
Collapse
Affiliation(s)
- Shi-Bin Li
- Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, 1201 Welch Road, Stanford, CA, 94305, USA.
| | - Luis de Lecea
- Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, 1201 Welch Road, Stanford, CA, 94305, USA.
| |
Collapse
|
16
|
Calva CB, Fayyaz H, Fadel JR. Effects of Intranasal Orexin-A (Hypocretin-1) Administration on Neuronal Activation, Neurochemistry, and Attention in Aged Rats. Front Aging Neurosci 2020; 11:362. [PMID: 32038222 PMCID: PMC6987046 DOI: 10.3389/fnagi.2019.00362] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 12/11/2019] [Indexed: 12/13/2022] Open
Abstract
Cognitive function represents a key determinative factor for independent functioning among the elderly, especially among those with age-related cognitive disorders. However; existing pharmacotherapeutic tactics for treating these disorders provide only modest benefits on cognition. The hypothalamic orexin (hypocretin) system is uniquely positioned, anatomically and functionally, to integrate physiological functions that support proper cognition. The ongoing paucity of orexin receptor agonists has mired the ability to study their potential as cognitive enhancers. Fortunately, intranasal administration of native orexin peptides circumvents this issue and others concerning peptide transport into the central nervous system (CNS). To investigate the ability of intranasal orexin-A (OxA) administration to improve the anatomical, neurochemical, and behavioral substrates of age-related cognitive dysfunction, these studies utilized a rodent model of aging combined with acute intranasal administration of saline or OxA. Here, intranasal OxA increases c-Fos expression in several telencephalic brain regions that mediate important cognitive functions, increases prefrontal cortical acetylcholine efflux, and alters set-shifting-mediated attentional function in rats. Ultimately, these studies provide a framework for the possible mechanisms and therapeutic potential of intranasal OxA in treating age-related cognitive dysfunction.
Collapse
Affiliation(s)
- Coleman B Calva
- Department of Pharmacology, Physiology and Neuroscience, University of South Carolina School of Medicine, Columbia, SC, United States
| | - Habiba Fayyaz
- Department of Pharmacology, Physiology and Neuroscience, University of South Carolina School of Medicine, Columbia, SC, United States
| | - Jim R Fadel
- Department of Pharmacology, Physiology and Neuroscience, University of South Carolina School of Medicine, Columbia, SC, United States
| |
Collapse
|
17
|
Liu L, Wang Q, Liu A, Lan X, Huang Y, Zhao Z, Jie H, Chen J, Zhao Y. Physiological Implications of Orexins/Hypocretins on Energy Metabolism and Adipose Tissue Development. ACS OMEGA 2020; 5:547-555. [PMID: 31956801 PMCID: PMC6964296 DOI: 10.1021/acsomega.9b03106] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 11/27/2019] [Indexed: 05/09/2023]
Abstract
Orexins/hypocretins and their receptors (OXRs) are ubiquitously distributed throughout the nervous system and peripheral tissues. Recently, various reports have indicated that orexins play regulatory roles in numerous physiological processes involved in obesity, energy homeostasis, sleep-wake cycle, analgesia, alcoholism, learning, and memory. This review aims to outline recent progress in the research and development of orexins used in biochemical signaling pathways, secretion pathways, and the regulation of energy metabolism/adipose tissue development. Orexins regulate a variety of physiological functions in the body by activating phospholipase C/protein kinase C and AC/cAMP/PKA pathways, through receptors coupled to Gq and Gi/Gs, respectively. The secretion of orexins is modulated by blood glucose, blood lipids, hormones, and neuropeptides. Orexins have critical functions in energy metabolism, regulating both feeding behavior and energy expenditure. Increasing the sensitivity of orexin-coupled hypothalamic neurons concurrently enhances spontaneous physical activity, non-exercise activity thermogenesis, white adipose tissue lipolysis, and brown adipose tissue thermogenesis. With this comprehensive review of the current literature on the subject, we hope to provide an integrated perspective for the prevention/treatment of obesity.
Collapse
Affiliation(s)
- Lingbin Liu
- College of Animal
Science and Technology, Chongqing Key Laboratory of Forage & Herbivore,
Chongqing Engineering Research Center for Herbivores Resource Protection
and Utilization, Southwest University, Beibei, 400715 Chongqing, P. R. China
- E-mail: (L.L.)
| | - Qigui Wang
- ChongQing Academy
of Animal Sciences, Rongchang, 402460 Chongqing, P. R. China
| | - Anfang Liu
- College of Animal Science, Southwest University, Rongchang Campus, Rongchang, 402460 Chongqing, P.R. China
| | - Xi Lan
- College of Animal
Science and Technology, Chongqing Key Laboratory of Forage & Herbivore,
Chongqing Engineering Research Center for Herbivores Resource Protection
and Utilization, Southwest University, Beibei, 400715 Chongqing, P. R. China
| | - Yongfu Huang
- College of Animal
Science and Technology, Chongqing Key Laboratory of Forage & Herbivore,
Chongqing Engineering Research Center for Herbivores Resource Protection
and Utilization, Southwest University, Beibei, 400715 Chongqing, P. R. China
| | - Zhongquan Zhao
- College of Animal
Science and Technology, Chongqing Key Laboratory of Forage & Herbivore,
Chongqing Engineering Research Center for Herbivores Resource Protection
and Utilization, Southwest University, Beibei, 400715 Chongqing, P. R. China
| | - Hang Jie
- Chongqing Institute of Medicinal Plant
Cultivation, Nanchuan, 408435 Chongqing, P.R. China
| | - Juncai Chen
- College of Animal
Science and Technology, Chongqing Key Laboratory of Forage & Herbivore,
Chongqing Engineering Research Center for Herbivores Resource Protection
and Utilization, Southwest University, Beibei, 400715 Chongqing, P. R. China
| | - Yongju Zhao
- College of Animal
Science and Technology, Chongqing Key Laboratory of Forage & Herbivore,
Chongqing Engineering Research Center for Herbivores Resource Protection
and Utilization, Southwest University, Beibei, 400715 Chongqing, P. R. China
- E-mail: (Y.Z.)
| |
Collapse
|
18
|
Shimizu S, Takenoshita N, Inagawa Y, Tsugawa A, Hirose D, Kaneko Y, Ogawa Y, Serisawa S, Sakurai S, Hirao K, Kanetaka H, Kanbayashi T, Imanishi A, Sakurai H, Hanyu H. Positive Association Between Cognitive Function and Cerebrospinal Fluid Orexin A Levels in Alzheimer’s Disease. J Alzheimers Dis 2020; 73:117-123. [DOI: 10.3233/jad-190958] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Soichiro Shimizu
- Department of Geriatric Medicine, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
| | - Naoto Takenoshita
- Department of Geriatric Medicine, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
| | - Yuta Inagawa
- Department of Geriatric Medicine, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
| | - Akito Tsugawa
- Department of Geriatric Medicine, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
| | - Daisuke Hirose
- Department of Geriatric Medicine, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
| | - Yoshitsugu Kaneko
- Department of Geriatric Medicine, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
| | - Yusuke Ogawa
- Department of Geriatric Medicine, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
| | - Shuntaro Serisawa
- Department of Geriatric Medicine, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
| | - Shu Sakurai
- Department of Geriatric Medicine, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
| | - Kentaro Hirao
- Department of Geriatric Medicine, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
| | - Hidekazu Kanetaka
- Department of Geriatric Medicine, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
| | - Takashi Kanbayashi
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Aya Imanishi
- Department of Neuropsychiatry, Akita University School of Medicine, Akita, Japan
| | - Hirofumi Sakurai
- Department of Geriatric Medicine, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
| | - Haruo Hanyu
- Department of Geriatric Medicine, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
| |
Collapse
|
19
|
Abstract
The neural mechanisms of sleep, a fundamental biological behavior from invertebrates to humans, have been a long-standing mystery and present an enormous challenge. Gradually, perspectives on the neurobiology of sleep have been more various with the technical innovations over the recent decades, and studies have now identified many specific neural circuits that selectively regulate the initiation and maintenance of wake, rapid eye movement (REM) sleep, and non-REM (NREM) sleep. The cholinergic system in basal forebrain (BF) that fire maximally during waking and REM sleep is one of the key neuromodulation systems related to waking and REM sleep. Here we outline the recent progress of the BF cholinergic system in sleep-wake cycle. The intricate local connectivity and multiple projections to other cortical and subcortical regions of the BF cholinergic system elaborately presented here form a conceptual framework for understanding the coordinating effects with the dissecting regions. This framework also provides evidences regarding the relationships between the general anesthesia and wakefulness/sleep cycle focusing on the neural circuitry of unconsciousness induced by anesthetic drugs.
Collapse
|
20
|
Alteration of Phospholipase C Expression in Rat Visual Cortical Neurons by Chronic Blockade of Orexin Receptor 1. Int J Pept Res Ther 2019. [DOI: 10.1007/s10989-019-09943-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
21
|
Baykal S, Albayrak Y, Durankuş F, Güzel S, Abbak Ö, Potas N, Beyazyüz M, Karabekiroğlu K, Donma MM. Decreased serum orexin A levels in drug-naive children with attention deficit and hyperactivity disorder. Neurol Sci 2019; 40:593-602. [PMID: 30617449 DOI: 10.1007/s10072-018-3692-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Accepted: 12/19/2018] [Indexed: 11/25/2022]
Affiliation(s)
- Saliha Baykal
- Faculty of Medicine, Department of Child and Adolescent Psychiatry, Tekirdağ Namık Kemal University, Tekirdag, Turkey.
| | - Yakup Albayrak
- Faculty of Medicine, Department of Psychiatry, Tekirdağ Namık Kemal University, Tekirdag, Turkey
| | - Ferit Durankuş
- Faculty of Medicine, Department of Pediatrics, Okan University, Istanbul, Turkey
| | - Savaş Güzel
- Faculty of Medicine, Department of Biochemistry, Tekirdağ Namık Kemal University, Tekirdag, Turkey
| | - Özlem Abbak
- Faculty of Medicine, Department of Psychiatry, Tekirdağ Namık Kemal University, Tekirdag, Turkey
| | - Nihan Potas
- Faculty of Economics and Administrative Science, Department of Healthcare Management, Gazi University, Ankara, Turkey
| | - Murat Beyazyüz
- Faculty of Medicine, Department of Psychiatry, Tekirdağ Namık Kemal University, Tekirdag, Turkey
| | - Koray Karabekiroğlu
- Faculty of Medicine, Department of Child and Adolescent Psychiatry, Ondokuz Mayıs University, Samsun, Turkey
| | - Mustafa Metin Donma
- Faculty of Medicine, Department of Pediatrics, Tekirdağ Namık Kemal University, Tekirdag, Turkey
| |
Collapse
|
22
|
Liu Z, Wang F, Tang M, Zhao Y, Wang X. Amyloid β and tau are involved in sleep disorder in Alzheimer's disease by orexin A and adenosine A(1) receptor. Int J Mol Med 2018; 43:435-442. [PMID: 30365112 DOI: 10.3892/ijmm.2018.3935] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Accepted: 10/01/2018] [Indexed: 11/06/2022] Open
Abstract
Sleep disorder is confirmed as a core component of Alzheimer's disease (AD), while the accumulation of amyloid β (Aβ) in brain tissue is an important pathological feature of AD. However, how Aβ affects AD‑associated sleep disorder is not yet well understood. In the present study, experiments on animal and cell models were performed to detect the association between sleep disorder and Aβ. It was observed that Aβ25‑35 administration significantly decreased non‑rapid eye movement sleep, while it increased wakefulness in mice. In addition, reverse transcription‑quantitative polymerase chain reaction and western blot analysis revealed that the expression levels of tau, p‑tau, orexin A and orexin neurons express adenosine A1 receptor (A1R) were markedly upregulated in the brain tissue of AD mice compared with that in samples obtained from control mice. Furthermore, the in vitro study revealed that the expression levels of tau, p‑tau, orexin A and adenosine A1R were also significantly increased in human neuroblastoma SH‑SY5Y cells treated with Aβ25‑35 as compared with the control cells. In addition, the tau inhibitor TRx 0237 significantly reversed the promoting effects of Aβ25‑35 on tau, p‑tau, orexin A and adenosine A1R expression levels, and adenosine A1R or orexin A knockdown also inhibited tau and p‑tau expression levels mediated by Aβ25‑35 in AD. These results indicate that Aβ and tau may be considered as novel biomarkers of sleep disorder in AD pathology, and that they function by regulating the expression levels of orexin A and adenosine A1R.
Collapse
Affiliation(s)
- Zhenhua Liu
- Department of Sleep Medicine Center, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, P.R. China
| | - Fumin Wang
- Department of Sleep Medicine Center, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, P.R. China
| | - Minglu Tang
- Department of Sleep Medicine Center, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, P.R. China
| | - Yongjun Zhao
- Department of Sleep Medicine Center, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, P.R. China
| | - Xiaoting Wang
- Department of Sleep Medicine Center, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, P.R. China
| |
Collapse
|
23
|
Sargin D. The role of the orexin system in stress response. Neuropharmacology 2018; 154:68-78. [PMID: 30266600 DOI: 10.1016/j.neuropharm.2018.09.034] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 09/18/2018] [Accepted: 09/21/2018] [Indexed: 11/30/2022]
Abstract
Orexins are neuropeptides that are exclusively produced by hypothalamic neurons, which project throughout the entire brain. Orexin, also known as hypocretins, were initially identified to play a fundamental role in food intake, arousal and the regulation of sleep and wakefulness. Recent studies identified orexins to be critical for diverse physiological processes including motivation, reward, attention, emotional regulation, stress and anxiety. Here, I review recent findings that indicate orexin has an important role in acute and chronic stress. I also summarize the recent optogenetic and chemogenetic studies that have advanced our understanding of the orexin system. I will conclude by discussing clinical studies that implicate orexins in mental health disorders. This article is part of the Special Issue entitled 'Hypothalamic Control of Homeostasis'.
Collapse
Affiliation(s)
- Derya Sargin
- Hotchkiss Brain Institute and the Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada.
| |
Collapse
|
24
|
Tyree SM, Borniger JC, de Lecea L. Hypocretin as a Hub for Arousal and Motivation. Front Neurol 2018; 9:413. [PMID: 29928253 PMCID: PMC5997825 DOI: 10.3389/fneur.2018.00413] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 05/18/2018] [Indexed: 01/01/2023] Open
Abstract
The lateral hypothalamus is comprised of a heterogeneous mix of neurons that serve to integrate and regulate sleep, feeding, stress, energy balance, reward, and motivated behavior. Within these populations, the hypocretin/orexin neurons are among the most well studied. Here, we provide an overview on how these neurons act as a central hub integrating sensory and physiological information to tune arousal and motivated behavior accordingly. We give special attention to their role in sleep-wake states and conditions of hyper-arousal, as is the case with stress-induced anxiety. We further discuss their roles in feeding, drug-seeking, and sexual behavior, which are all dependent on the motivational state of the animal. We further emphasize the application of powerful techniques, such as optogenetics, chemogenetics, and fiber photometry, to delineate the role these neurons play in lateral hypothalamic functions.
Collapse
Affiliation(s)
- Susan M Tyree
- Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA, United States
| | - Jeremy C Borniger
- Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA, United States
| | - Luis de Lecea
- Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA, United States
| |
Collapse
|
25
|
Tsai MC, Huang TL. Orexin A in men with heroin use disorder undergoing methadone maintenance treatment. Psychiatry Res 2018; 264:412-415. [PMID: 29680730 DOI: 10.1016/j.psychres.2018.04.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Revised: 04/02/2018] [Accepted: 04/02/2018] [Indexed: 12/16/2022]
Abstract
Orexins have played a role in reward-seeking and addiction-related behavior. There are few reports in the literature on serum levels of orexins in patients with heroin use disorder (HUD) undergoing methadone maintenance treatment (MMT). The aim of this study was to investigate the serum levels of orexin A in HUD patients undergoing MMT. Fifty male HUD patients undergoing MMT and 25 healthy males were enrolled for this study. Serum orexin A were measured with assay kits. Using analysis of covariance (ANCOVA) with body mass index (BMI) adjustments, the serum levels of orexin A in HUD men undergoing MMT were found to be significantly higher than in healthy controls. In conclusion, our results suggest that MMT might increase orexin A levels in HUD patients.
Collapse
Affiliation(s)
- Meng-Chang Tsai
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan, ROC
| | - Tiao-Lai Huang
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan, ROC.
| |
Collapse
|
26
|
Calva CB, Fayyaz H, Fadel JR. Increased acetylcholine and glutamate efflux in the prefrontal cortex following intranasal orexin-A (hypocretin-1). J Neurochem 2018; 145:232-244. [PMID: 29250792 PMCID: PMC5924451 DOI: 10.1111/jnc.14279] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 12/01/2017] [Accepted: 12/04/2017] [Indexed: 01/20/2023]
Abstract
Orexin/hypocretin neurons of the lateral hypothalamus and perifornical area are integrators of physiological function. Previous work from our laboratory and others has shown the importance of orexin transmission in cognition. Age-related reductions in markers of orexin function further suggest that this neuropeptide may be a useful target for the treatment of age-related cognitive dysfunction. Intranasal administration of orexin-A (OxA) has shown promise as a therapeutic option for cognitive dysfunction. However, the neurochemical mechanisms of intranasal OxA administration are not fully understood. Here, we use immunohistochemistry and in vivo microdialysis to define the effects of acute intranasal OxA administration on: (i) activation of neuronal populations in the cortex, basal forebrain, and brainstem and (ii) acetylcholine (ACh) and glutamate efflux in the prefrontal cortex (PFC) of Fischer 344/Brown Norway F1 rats. Acute intranasal administration of OxA significantly increased c-Fos expression, a marker for neuronal activation, in the PFC and in subpopulations of basal forebrain cholinergic neurons. Subsequently, we investigated the effects of acute intranasal OxA on neurotransmitter efflux in the PFC and found that intranasal OxA significantly increased both ACh and glutamate efflux in this region. These findings were independent from any changes in c-Fos expression in orexin neurons, suggesting that these effects are not resultant from direct activation of orexin neurons. In total, these data indicate that intranasal OxA may enhance cognition through activation of distinct neuronal populations in the cortex and basal forebrain and through increased neurotransmission of ACh and glutamate in the PFC.
Collapse
Affiliation(s)
- Coleman B. Calva
- Department of Pharmacology, Physiology and Neuroscience, University of South Carolina School of Medicine, Columbia, South Carolina, 29208 USA
| | - Habiba Fayyaz
- Department of Pharmacology, Physiology and Neuroscience, University of South Carolina School of Medicine, Columbia, South Carolina, 29208 USA
| | - Jim R. Fadel
- Department of Pharmacology, Physiology and Neuroscience, University of South Carolina School of Medicine, Columbia, South Carolina, 29208 USA
| |
Collapse
|
27
|
Sil’kis IG. A Neurochemical Approach to the Search for Drugs for the Treatment of Symptoms of Alzheimer’s Disease. NEUROCHEM J+ 2018. [DOI: 10.1134/s1819712418010130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
28
|
Neurochemical Heterogeneity Among Lateral Hypothalamic Hypocretin/Orexin and Melanin-Concentrating Hormone Neurons Identified Through Single-Cell Gene Expression Analysis. eNeuro 2017; 4:eN-NWR-0013-17. [PMID: 28966976 PMCID: PMC5617207 DOI: 10.1523/eneuro.0013-17.2017] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 08/14/2017] [Accepted: 08/25/2017] [Indexed: 02/06/2023] Open
Abstract
The lateral hypothalamic area (LHA) lies at the intersection of multiple neural and humoral systems and orchestrates fundamental aspects of behavior. Two neuronal cell types found in the LHA are defined by their expression of hypocretin/orexin (Hcrt/Ox) and melanin-concentrating hormone (MCH) and are both important regulators of arousal, feeding, and metabolism. Conflicting evidence suggests that these cell populations have a more complex signaling repertoire than previously appreciated, particularly in regard to their coexpression of other neuropeptides and the machinery for the synthesis and release of GABA and glutamate. Here, we undertook a single-cell expression profiling approach to decipher the neurochemical phenotype, and heterogeneity therein, of Hcrt/Ox and MCH neurons. In transgenic mouse lines, we used single-cell quantitative polymerase chain reaction (qPCR) to quantify the expression of 48 key genes, which include neuropeptides, fast neurotransmitter components, and other key markers, which revealed unexpected neurochemical diversity. We found that single MCH and Hcrt/Ox neurons express transcripts for multiple neuropeptides and markers of both excitatory and inhibitory fast neurotransmission. Virtually all MCH and approximately half of the Hcrt/Ox neurons sampled express both the machinery for glutamate release and GABA synthesis in the absence of a vesicular GABA release pathway. Furthermore, we found that this profile is characteristic of a subpopulation of LHA glutamatergic neurons but contrasts with a broad population of LHA GABAergic neurons. Identifying the neurochemical diversity of Hcrt/Ox and MCH neurons will further our understanding of how these populations modulate postsynaptic excitability through multiple signaling mechanisms and coordinate diverse behavioral outputs.
Collapse
|
29
|
Abstract
Alzheimer's disease (AD) is the most frequent age-related dementia. It prevalently causes cognitive decline, although it is frequently associated with secondary behavioral disturbances. AD neurodegeneration characteristically produces a remarkable destruction of the sleep-wake cycle, with diurnal napping, nighttime arousals, sleep fragmentation, and REM sleep impairment. It was recently hypothesized that the orexinergic system was involved in AD pathology. Accordingly, recent papers showed the association between orexinergic neurotransmission dysfunction, sleep impairment, and cognitive decline in AD. Orexin is a hypothalamic neurotransmitter which physiologically produces wakefulness and reduces REM sleep and may alter the sleep-wake cycle in AD patients. Furthermore, the orexinergic system seems to interact with CSF AD biomarkers, such as beta-amyloid and tau proteins. Beta-amyloid accumulation is the main hallmark of AD pathology, while tau proteins mark brain neuronal injury due to AD pathology. Investigations so far suggest that orexinergic signaling overexpression alters the sleep-wake cycle and secondarily induces beta-amyloid accumulation and tau-mediated neurodegeneration. Therefore, considering that orexinergic system dysregulation impairs sleep-wake rhythms and may influence AD pathology, it is hypothesized that orexin receptor antagonists are likely potential preventive/therapeutic options in AD patients.
Collapse
Affiliation(s)
- Claudio Liguori
- Sleep Medicine Centre, Neurophysiopathology Unit, Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy.
| |
Collapse
|
30
|
Hypocretin (orexin) is critical in sustaining theta/gamma-rich waking behaviors that drive sleep need. Proc Natl Acad Sci U S A 2017. [PMID: 28630298 DOI: 10.1073/pnas.1700983114] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Hcrt gene inactivation in mice leads to behavioral state instability, abnormal transitions to paradoxical sleep, and cataplexy, hallmarks of narcolepsy. Sleep homeostasis is, however, considered unimpaired in patients and narcoleptic mice. We find that whereas Hcrtko/ko mice respond to 6-h sleep deprivation (SD) with a slow-wave sleep (SWS) EEG δ (1.0 to 4.0 Hz) power rebound like WT littermates, spontaneous waking fails to induce a δ power reflecting prior waking duration. This correlates with impaired θ (6.0 to 9.5 Hz) and fast-γ (55 to 80 Hz) activity in prior waking. We algorithmically identify a theta-dominated wakefulness (TDW) substate underlying motivated behaviors and typically preceding cataplexy in Hcrtko/ko mice. Hcrtko/ko mice fully implement TDW when waking is enforced, but spontaneous TDW episode duration is greatly reduced. A reformulation of the classic sleep homeostasis model, where homeostatic pressure rises exclusively in TDW rather than all waking, predicts δ power dynamics both in Hcrtko/ko and WT mouse baseline and recovery SWS. The low homeostatic impact of Hcrtko/ko mouse spontaneous waking correlates with decreased cortical expression of neuronal activity-related genes (notably Bdnf, Egr1/Zif268, and Per2). Thus, spontaneous TDW stability relies on Hcrt to sustain θ/fast-γ network activity and associated plasticity, whereas other arousal circuits sustain TDW during SD. We propose that TDW identifies a discrete global brain activity mode that is regulated by context-dependent neuromodulators and acts as a major driver of sleep homeostasis. Hcrt loss in Hcrtko/ko mice causes impaired TDW maintenance in baseline wake and blunted δ power in SWS, reproducing, respectively, narcolepsy excessive daytime sleepiness and poor sleep quality.
Collapse
|
31
|
Mishima T, Kasanuki K, Koga S, Castanedes-Casey M, Wszolek ZK, Tsuboi Y, Dickson DW. Reduced orexin immunoreactivity in Perry syndrome and multiple system atrophy. Parkinsonism Relat Disord 2017; 42:85-89. [PMID: 28651750 DOI: 10.1016/j.parkreldis.2017.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 06/01/2017] [Accepted: 06/10/2017] [Indexed: 10/19/2022]
Abstract
INTRODUCTION Orexin is a neuropeptide that plays a key role in maintaining a state of arousal, and possibly associates with sleep apnea syndrome (SAS). Reduced orexin immunoreactivity has been reported in various neurologic conditions such as narcolepsy, Alzheimer's disease, Lewy body disease and multiple system atrophy (MSA); however, there has been no report investigating orexin in Perry syndrome, a rare hereditary neurodegenerative disease characterized by four clinical cardinal signs (parkinsonism, depression/apathy, weight loss, and central hypoventilation). Perry syndrome patients frequently have sleep disturbances, including SAS and insomnia. METHODS We evaluated orexin immunoreactivity in Perry syndrome. Using imaging analysis, we quantitatively assessed orexin immunoreactivity in the nucleus basalis of Meynert in three Perry syndrome cases, as well as five cases of frontotemporal lobar degeneration with motor neuron disease, five cases of MSA and five age-matched controls. For these cases, antemortem clinical information on sleep disturbances has been reviewed. RESULTS In Perry syndrome and MSA, there was reduction of orexin immunoreactivity compared with controls (Perry syndrome: p = 0.020, MSA: p < 0.001). In contrast, FTLD-MND did not have significant reduction of orexin immunoreactivity. Two out of three cases of Perry syndrome had SAS confirmed by polysomnography. CONCLUSIONS This is the first report assessing orexin immunoreactivity in Perry syndrome, and it showed significant reduction, similar to select neurodegenerative diseases, such as MSA. Further analysis with more cases will be needed to elucidate the specific mechanism of orexin loss in these disorders.
Collapse
Affiliation(s)
- Takayasu Mishima
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL 32224, United States; Department of Neurology, Fukuoka University, Fukuoka 8140180, Japan
| | - Koji Kasanuki
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL 32224, United States
| | - Shunsuke Koga
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL 32224, United States
| | | | - Zbigniew K Wszolek
- Department of Neurology, Mayo Clinic, Jacksonville, FL 32224, United States
| | - Yoshio Tsuboi
- Department of Neurology, Fukuoka University, Fukuoka 8140180, Japan
| | - Dennis W Dickson
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL 32224, United States.
| |
Collapse
|
32
|
Agostinelli LJ, Ferrari LL, Mahoney CE, Mochizuki T, Lowell BB, Arrigoni E, Scammell TE. Descending projections from the basal forebrain to the orexin neurons in mice. J Comp Neurol 2017; 525:1668-1684. [PMID: 27997037 PMCID: PMC5806522 DOI: 10.1002/cne.24158] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 11/02/2016] [Accepted: 11/02/2016] [Indexed: 12/23/2022]
Abstract
The orexin (hypocretin) neurons play an essential role in promoting arousal, and loss of the orexin neurons results in narcolepsy, a condition characterized by chronic sleepiness and cataplexy. The orexin neurons excite wake-promoting neurons in the basal forebrain (BF), and a reciprocal projection from the BF back to the orexin neurons may help promote arousal and motivation. The BF contains at least three different cell types (cholinergic, glutamatergic, and γ-aminobutyric acid (GABA)ergic neurons) across its different regions (medial septum, diagonal band, magnocellular preoptic area, and substantia innominata). Given the neurochemical and anatomical heterogeneity of the BF, we mapped the pattern of BF projections to the orexin neurons across multiple BF regions and neuronal types. We performed conditional anterograde tracing using mice that express Cre recombinase only in neurons producing acetylcholine, glutamate, or GABA. We found that the orexin neurons are heavily apposed by axon terminals of glutamatergic and GABAergic neurons of the substantia innominata (SI) and magnocellular preoptic area, but there was no innervation by the cholinergic neurons. Channelrhodopsin-assisted circuit mapping (CRACM) demonstrated that glutamatergic SI neurons frequently form functional synapses with the orexin neurons, but, surprisingly, functional synapses from SI GABAergic neurons were rare. Considering their strong reciprocal connections, BF and orexin neurons likely work in concert to promote arousal, motivation, and other behaviors. J. Comp. Neurol. 525:1668-1684, 2017. © 2016 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Lindsay J Agostinelli
- Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - Loris L Ferrari
- Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - Carrie E Mahoney
- Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - Takatoshi Mochizuki
- Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - Bradford B Lowell
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - Elda Arrigoni
- Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - Thomas E Scammell
- Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| |
Collapse
|
33
|
Villano I, Messina A, Valenzano A, Moscatelli F, Esposito T, Monda V, Esposito M, Precenzano F, Carotenuto M, Viggiano A, Chieffi S, Cibelli G, Monda M, Messina G. Basal Forebrain Cholinergic System and Orexin Neurons: Effects on Attention. Front Behav Neurosci 2017; 11:10. [PMID: 28197081 PMCID: PMC5281635 DOI: 10.3389/fnbeh.2017.00010] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Accepted: 01/12/2017] [Indexed: 12/27/2022] Open
Abstract
The basal forebrain (BF) cholinergic system has an important role in attentive functions. The cholinergic system can be activated by different inputs, and in particular, by orexin neurons, whose cell bodies are located within the postero-lateral hypothalamus. Recently the orexin-producing neurons have been proved to promote arousal and attention through their projections to the BF. The aim of this review article is to summarize the evidence showing that the orexin system contributes to attentional processing by an increase in cortical acetylcholine release and in cortical neurons activity.
Collapse
Affiliation(s)
- Ines Villano
- Department of Experimental Medicine, Second University of Naples Naples, Italy
| | - Antonietta Messina
- Department of Experimental Medicine, Second University of Naples Naples, Italy
| | - Anna Valenzano
- Department of Clinical and Experimental Medicine, University of Foggia Foggia, Italy
| | - Fiorenzo Moscatelli
- Department of Clinical and Experimental Medicine, University of FoggiaFoggia, Italy; Department of Motor, Human and Health Science, University of Rome, "Foro Italico"Rome, Italy
| | - Teresa Esposito
- Department of Experimental Medicine, Second University of Naples Naples, Italy
| | - Vincenzo Monda
- Department of Experimental Medicine, Second University of Naples Naples, Italy
| | - Maria Esposito
- Department of Mental Health, Physical and Preventive Medicine, Second University of Naples Naples, Italy
| | - Francesco Precenzano
- Department of Mental Health, Physical and Preventive Medicine, Second University of Naples Naples, Italy
| | - Marco Carotenuto
- Department of Mental Health, Physical and Preventive Medicine, Second University of NaplesNaples, Italy; Neapolitan Brain Group (NBG), Clinic of Child and Adolescent Neuropsychiatry, Department of Mental, Physical Health and Preventive Medicine, Second University of NaplesNaples, Italy
| | - Andrea Viggiano
- Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno Salerno, Italy
| | - Sergio Chieffi
- Department of Clinical and Experimental Medicine, University of Foggia Foggia, Italy
| | - Giuseppe Cibelli
- Department of Clinical and Experimental Medicine, University of Foggia Foggia, Italy
| | - Marcellino Monda
- Department of Experimental Medicine, Second University of Naples Naples, Italy
| | - Giovanni Messina
- Department of Experimental Medicine, Second University of NaplesNaples, Italy; Department of Clinical and Experimental Medicine, University of FoggiaFoggia, Italy
| |
Collapse
|
34
|
James MH, Campbell EJ, Dayas CV. Role of the Orexin/Hypocretin System in Stress-Related Psychiatric Disorders. Curr Top Behav Neurosci 2017; 33:197-219. [PMID: 28083790 DOI: 10.1007/7854_2016_56] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Orexins (hypocretins) are critically involved in coordinating appropriate physiological and behavioral responses to aversive and threatening stimuli. Acute stressors engage orexin neurons via direct projections from stress-sensitive brain regions. Orexin neurons, in turn, facilitate adaptive behavior via reciprocal connections as well as via direct projections to the hypophysiotropic neurons that coordinate the hypothalamic-pituitary-adrenal (HPA) axis response to stress. Consequently, hyperactivity of the orexin system is associated with increased motivated arousal and anxiety, and is emerging as a key feature of panic disorder. Accordingly, there has been significant interest in the therapeutic potential of pharmacological agents that antagonize orexin signaling at their receptors for the treatment of anxiety disorders. In contrast, disorders characterized by inappropriately low levels of motivated arousal, such as depression, generally appear to be associated with hypoactivity of the orexin system. This includes narcolepsy with cataplexy, a disorder characterized by the progressive loss of orexin neurons and increased rates of moderate/severe depression symptomology. Here, we provide a comprehensive overview of both clinical and preclinical evidence highlighting the role of orexin signaling in stress reactivity, as well as how perturbations to this system can result in dysregulated behavioral phenotypes.
Collapse
Affiliation(s)
- Morgan H James
- Brain Health Institute, Rutgers University/Rutgers Biomedical and Health Sciences, Piscataway, NJ, USA
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, VIC, 2337, Australia
| | - Erin J Campbell
- School of Biomedical Sciences and Pharmacy, Centre for Brain and Mental Health, University of Newcastle, Callaghan, NSW, Australia
- Hunter Medical Research Institute, 1 Kookaburra Circuit, New Lambton Heights, NSW, Australia
| | - Christopher V Dayas
- School of Biomedical Sciences and Pharmacy, Centre for Brain and Mental Health, University of Newcastle, Callaghan, NSW, Australia.
- Hunter Medical Research Institute, 1 Kookaburra Circuit, New Lambton Heights, NSW, Australia.
| |
Collapse
|
35
|
Schöne C, Burdakov D. Orexin/Hypocretin and Organizing Principles for a Diversity of Wake-Promoting Neurons in the Brain. Curr Top Behav Neurosci 2017; 33:51-74. [PMID: 27830577 PMCID: PMC5767105 DOI: 10.1007/7854_2016_45] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
An enigmatic feature of behavioural state control is the rich diversity of wake-promoting neural systems. This diversity has been rationalized as 'robustness via redundancy', wherein wakefulness control is not critically dependent on one type of neuron or molecule. Studies of the brain orexin/hypocretin system challenge this view by demonstrating that wakefulness control fails upon loss of this neurotransmitter system. Since orexin neurons signal arousal need, and excite other wake-promoting neurons, their actions illuminate nonredundant principles of arousal control. Here, we suggest such principles by reviewing the orexin system from a collective viewpoint of biology, physics and engineering. Orexin peptides excite other arousal-promoting neurons (noradrenaline, histamine, serotonin, acetylcholine neurons), either by activating mixed-cation conductances or by inhibiting potassium conductances. Ohm's law predicts that these opposite conductance changes will produce opposite effects on sensitivity of neuronal excitability to current inputs, thus enabling orexin to differentially control input-output gain of its target networks. Orexin neurons also produce other transmitters, including glutamate. When orexin cells fire, glutamate-mediated downstream excitation displays temporal decay, but orexin-mediated excitation escalates, as if orexin transmission enabled arousal controllers to compute a time integral of arousal need. Since the anatomical and functional architecture of the orexin system contains negative feedback loops (e.g. orexin ➔ histamine ➔ noradrenaline/serotonin-orexin), such computations may stabilize wakefulness via integral feedback, a basic engineering strategy for set point control in uncertain environments. Such dynamic behavioural control requires several distinct wake-promoting modules, which perform nonredundant transformations of arousal signals and are connected in feedback loops.
Collapse
Affiliation(s)
- Cornelia Schöne
- Department of Neurology, University of Bern, Bern University Hospital, 3010, Bern, Switzerland
| | - Denis Burdakov
- The Francis Crick Institute, Mill Hill Laboratory, London, NW7 1AA, UK.
| |
Collapse
|
36
|
Partinen M. All children with narcolepsy type 1 should be encouraged to sleep regular naps during daytime. Sleep Med 2016; 24:145-146. [PMID: 27810180 DOI: 10.1016/j.sleep.2016.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Markku Partinen
- Finnish Narcolepsy Research Center, Helsinki Sleep Clinic, Vitalmed Research Center, Department of Clinical Neurosciences, University of Helsinki, Valimotie 21, 00380 Helsinki, Finland.
| |
Collapse
|
37
|
Thomasy HE, Febinger HY, Ringgold KM, Gemma C, Opp MR. Hypocretinergic and cholinergic contributions to sleep-wake disturbances in a mouse model of traumatic brain injury. Neurobiol Sleep Circadian Rhythms 2016; 2:71-84. [PMID: 31236496 PMCID: PMC6575582 DOI: 10.1016/j.nbscr.2016.03.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 03/25/2016] [Accepted: 03/28/2016] [Indexed: 12/24/2022] Open
Abstract
Disorders of sleep and wakefulness occur in the majority of individuals who have experienced traumatic brain injury (TBI), with increased sleep need and excessive daytime sleepiness often reported. Behavioral and pharmacological therapies have limited efficacy, in part, because the etiology of post-TBI sleep disturbances is not well understood. Severity of injuries resulting from head trauma in humans is highly variable, and as a consequence so are their sequelae. Here, we use a controlled laboratory model to investigate the effects of TBI on sleep-wake behavior and on candidate neurotransmitter systems as potential mediators. We focus on hypocretin and melanin-concentrating hormone (MCH), hypothalamic neuropeptides important for regulating sleep and wakefulness, and two potential downstream effectors of hypocretin actions, histamine and acetylcholine. Adult male C57BL/6 mice (n=6-10/group) were implanted with EEG recording electrodes and baseline recordings were obtained. After baseline recordings, controlled cortical impact was used to induce mild or moderate TBI. EEG recordings were obtained from the same animals at 7 and 15 days post-surgery. Separate groups of animals (n=6-8/group) were used to determine effects of TBI on the numbers of hypocretin and MCH-producing neurons in the hypothalamus, histaminergic neurons in the tuberomammillary nucleus, and cholinergic neurons in the basal forebrain. At 15 days post-TBI, wakefulness was decreased and NREM sleep was increased during the dark period in moderately injured animals. There were no differences between groups in REM sleep time, nor were there differences between groups in sleep during the light period. TBI effects on hypocretin and cholinergic neurons were such that more severe injury resulted in fewer cells. Numbers of MCH neurons and histaminergic neurons were not altered under the conditions of this study. Thus, we conclude that moderate TBI in mice reduces wakefulness and increases NREM sleep during the dark period, effects that may be mediated by hypocretin-producing neurons and/or downstream cholinergic effectors in the basal forebrain.
Collapse
Affiliation(s)
- Hannah E Thomasy
- Graduate Program in Neuroscience, University of Washington, Seattle, WA, United States
| | - Heidi Y Febinger
- Department of Anesthesiology & Pain Medicine, University of Washington, Seattle, WA, United States
| | - Kristyn M Ringgold
- Department of Anesthesiology & Pain Medicine, University of Washington, Seattle, WA, United States
| | - Carmelina Gemma
- Department of Anesthesiology & Pain Medicine, University of Washington, Seattle, WA, United States
| | - Mark R Opp
- Graduate Program in Neuroscience, University of Washington, Seattle, WA, United States.,Department of Anesthesiology & Pain Medicine, University of Washington, Seattle, WA, United States
| |
Collapse
|
38
|
Zajo KN, Fadel JR, Burk JA. Orexin A-induced enhancement of attentional processing in rats: role of basal forebrain neurons. Psychopharmacology (Berl) 2016; 233:639-47. [PMID: 26534765 PMCID: PMC4729649 DOI: 10.1007/s00213-015-4139-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 10/26/2015] [Indexed: 12/28/2022]
Abstract
RATIONALE Orexins are neuropeptides released in multiple brain regions from neurons that originate within the lateral hypothalamus and contiguous perfornical area. The basal forebrain, a structure implicated in attentional processing, receives orexinergic inputs. Our previous work demonstrated that administration of an orexin-1 receptor antagonist, SB-334867, systemically or via infusion directly into the basal forebrain, can disrupt performance in a task that places explicit demands on attentional processing. OBJECTIVES Given that the orexin-1 receptor binds orexin A with high affinity, we tested whether orexin A could enhance attention in rats. METHODS Attentional performance was assessed using a task that required discrimination of variable duration visual signals from trials when no signal was presented. We also tested whether infusions of orexin A into the lateral ventricle could attenuate deficits following lesions of medial prefrontal cortical cholinergic projections that arise from the basal forebrain. RESULTS Infusions of orexin A into the basal forebrain attenuated distracter-induced decreases in attentional performance. Orexin A attenuated deficits in lesioned animals when a visual distracter was presented. CONCLUSION The present results support the view that orexin A can enhance attentional performance via actions in the basal forebrain and may be beneficial for some conditions characterized by attentional dysfunction due to disruption of cortical cholinergic inputs.
Collapse
Affiliation(s)
- Kristin N. Zajo
- Department of Psychology, College of William & Mary, Williamsburg, Virginia 23187, USA
| | - Jim R. Fadel
- Department of Pharmacology, Physiology and Neuroscience, University of South Carolina School of Medicine, Columbia, South Carolina 29208, USA
| | - Joshua A. Burk
- Department of Psychology, College of William & Mary, Williamsburg, Virginia 23187, USA
| |
Collapse
|
39
|
Ferrari LL, Agostinelli LJ, Krashes MJ, Lowell BB, Scammell TE, Arrigoni E. Dynorphin inhibits basal forebrain cholinergic neurons by pre- and postsynaptic mechanisms. J Physiol 2016; 594:1069-85. [PMID: 26613645 DOI: 10.1113/jp271657] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Accepted: 11/24/2015] [Indexed: 12/29/2022] Open
Abstract
KEY POINTS The basal forebrain is an important component of the ascending arousal system and may be a key site through which the orexin neurons promote arousal. It has long been known that orexin-A and -B excite basal forebrain cholinergic neurons, but orexin-producing neurons also make the inhibitory peptide dynorphin. Using whole-cell recordings in brain slices, we found that dynorphin-A directly inhibits basal forebrain cholinergic neurons via κ-opioid receptors, and decreases afferent excitatory synaptic input to these neurons. While the effects of dynorphin-A and orexin-A desensitize over multiple applications, co-application of dynorphin-A and orexin-A produces a sustained response that reverses depending on the membrane potential of basal forebrain cholinergic neurons. At -40 mV the net effect of the co-application is inhibition by dynorphin-A, whereas at -70 mV the excitatory response to orexin-A prevails. ABSTRACT The basal forebrain (BF) is an essential component of the ascending arousal systems and may be a key site through which the orexin (also known as hypocretin) neurons drive arousal and promote the maintenance of normal wakefulness. All orexin neurons also make dynorphin, and nearly all brain regions innervated by the orexin neurons express kappa opiate receptors, the main receptor for dynorphin. This is remarkable because orexin excites target neurons including BF neurons, but dynorphin has inhibitory effects. We identified the sources of dynorphin input to the magnocellular preoptic nucleus and substantia innominata (MCPO/SI) in mice and determined the effects of dynorphin-A on MCPO/SI cholinergic neurons using patch-clamp recordings in brain slices. We found that the orexin neurons are the main source of dynorphin input to the MCPO/SI region, and dynorphin-A inhibits MCPO/SI cholinergic neurons through κ-opioid receptors by (1) activation of a G protein-coupled inwardly rectifying potassium current, (2) inhibition of a voltage-gated Ca(2+) current and (3) presynaptic depression of the glutamatergic input to these neurons. The responses both to dynorphin-A and to orexin-A desensitize, but co-application of dynorphin-A and orexin-A produces a sustained response. In addition, the polarity of the response to the co-application depends on the membrane potential of BF neurons; at -40 mV the net effect of the co-application is inhibition by dynorphin-A, whereas at -70 mV the excitatory response to orexin-A prevails. This suggests that depending on their state of activation, BF cholinergic neurons can be excited or inhibited by signals from the orexin neurons.
Collapse
Affiliation(s)
- L L Ferrari
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA, 02215, USA
| | - L J Agostinelli
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA, 02215, USA
| | - M J Krashes
- National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD, 20892-1453, USA
| | - B B Lowell
- Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA, 02215, USA
| | - T E Scammell
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA, 02215, USA
| | - E Arrigoni
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA, 02215, USA
| |
Collapse
|
40
|
Mavanji V, Perez-Leighton CE, Kotz CM, Billington CJ, Parthasarathy S, Sinton CM, Teske JA. Promotion of Wakefulness and Energy Expenditure by Orexin-A in the Ventrolateral Preoptic Area. Sleep 2015; 38:1361-70. [PMID: 25845696 DOI: 10.5665/sleep.4970] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 03/07/2015] [Indexed: 12/25/2022] Open
Abstract
STUDY OBJECTIVES The ventrolateral preoptic area (VLPO) and the orexin/hypocretin neuronal system are key regulators of sleep onset, transitions between vigilance states, and energy homeostasis. Reciprocal projections exist between the VLPO and orexin/hypocretin neurons. Although the importance of the VLPO to sleep regulation is clear, it is unknown whether VLPO neurons are involved in energy balance. The purpose of these studies was to determine if the VLPO is a site of action for orexin-A, and which orexin receptor subtype(s) would mediate these effects of orexin-A. We hypothesized that orexin-A in the VLPO modulates behaviors (sleep and wakefulness, feeding, spontaneous physical activity [SPA]) to increase energy expenditure. DESIGN AND MEASUREMENTS Sleep, wakefulness, SPA, feeding, and energy expenditure were determined after orexin-A microinjection in the VLPO of male Sprague-Dawley rats with unilateral cannulae targeting the VLPO. We also tested whether pretreatment with a dual orexin receptor antagonist (DORA, TCS-1102) or an OX2R antagonist (JNJ-10397049) blocked the effects of orexin-A on the sleep/wake cycle or SPA, respectively. RESULTS Orexin-A injected into the VLPO significantly increased wakefulness, SPA, and energy expenditure (SPA-induced and total) and reduced NREM sleep and REM sleep with no effect on food intake. Pretreatment with DORA blocked the increase in wakefulness and the reduction in NREM sleep elicited by orexin-A, and the OX2R antagonist reduced SPA stimulated by orexin-A. CONCLUSIONS These data show the ventrolateral preoptic area is a site of action for orexin-A, which may promote negative energy balance by modulating sleep/wakefulness and stimulating spontaneous physical activity and energy expenditure.
Collapse
Affiliation(s)
| | - Claudio E Perez-Leighton
- Center for Integrative Medicine and Innovative Science, Universidad Andres Bello, Santiago, Chile.,Escuela de Nutricion, Facultad de Medicina, Universidad Andres Bello, Santiago, Chile
| | - Catherine M Kotz
- Minneapolis VA Health Care System, Minneapolis, MN.,Geriatric Research Education and Clinical Center, Minneapolis, MN.,Minnesota Obesity Center, University of Minnesota, Saint Paul, MN.,Department of Food Science and Nutrition, University of Minnesota, Saint Paul, MN
| | - Charles J Billington
- Minneapolis VA Health Care System, Minneapolis, MN.,Minnesota Obesity Center, University of Minnesota, Saint Paul, MN.,Department of Medicine, University of Minnesota, Saint Paul, MN.,Department of Food Science and Nutrition, University of Minnesota, Saint Paul, MN
| | - Sairam Parthasarathy
- Arizona Respiratory Center University of Arizona, Tucson, AZ.,Department of Medicine University of Arizona, Tucson, AZ
| | - Christopher M Sinton
- Arizona Respiratory Center University of Arizona, Tucson, AZ.,Department of Medicine University of Arizona, Tucson, AZ
| | - Jennifer A Teske
- Department of Nutritional Sciences, University of Arizona, Tucson, AZ.,Minneapolis VA Health Care System, Minneapolis, MN.,Minnesota Obesity Center, University of Minnesota, Saint Paul, MN.,Department of Food Science and Nutrition, University of Minnesota, Saint Paul, MN
| |
Collapse
|
41
|
Kuwaki T. Thermoregulation under pressure: a role for orexin neurons. Temperature (Austin) 2015; 2:379-91. [PMID: 27227052 PMCID: PMC4843912 DOI: 10.1080/23328940.2015.1066921] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 06/20/2015] [Accepted: 06/22/2015] [Indexed: 01/06/2023] Open
Abstract
In the past, studies on stress responses and sleep/wake regulation were performed separately. The discovery of orexin (hypocretin) in 1998, however, dramatically changed the course of research and new findings regarding its role in these complex processes provided a better insight into their interactions and intricacies. Orexin-containing neuronal activity has been found to be minimal during sleep. It increases during the waking period and further increases during the active waking period, which includes stress responses and exploratory behaviors. Autonomic regulation of the body, which includes body temperature, blood flow, and ventilation, is also activated along with the change in vigilance states. Our recent findings suggest that orexin neurons act as a conductor of orchestration for vigilance states, behaviors, and autonomic functions. Body temperature regulation by orexin neurons seems to be mediated by one of its cotransmitters while cardiovascular and respiratory regulation are mediated by orexin itself.
Collapse
Affiliation(s)
- Tomoyuki Kuwaki
- Department of Physiology; Kagoshima University Graduate School of Medical and Dental Sciences ; Kagoshima, Japan
| |
Collapse
|
42
|
Vazquez-DeRose J, Schwartz MD, Nguyen AT, Warrier DR, Gulati S, Mathew TK, Neylan TC, Kilduff TS. Hypocretin/orexin antagonism enhances sleep-related adenosine and GABA neurotransmission in rat basal forebrain. Brain Struct Funct 2014; 221:923-40. [PMID: 25431268 DOI: 10.1007/s00429-014-0946-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2014] [Accepted: 11/15/2014] [Indexed: 12/31/2022]
Abstract
Hypocretin/orexin (HCRT) neurons provide excitatory input to wake-promoting brain regions including the basal forebrain (BF). The dual HCRT receptor antagonist almorexant (ALM) decreases waking and increases sleep. We hypothesized that HCRT antagonists induce sleep, in part, through disfacilitation of BF neurons; consequently, ALM should have reduced efficacy in BF-lesioned (BFx) animals. To test this hypothesis, rats were given bilateral IgG-192-saporin injections, which predominantly targets cholinergic BF neurons. BFx and intact rats were then given oral ALM, the benzodiazepine agonist zolpidem (ZOL) or vehicle (VEH) at lights-out. ALM was less effective than ZOL at inducing sleep in BFx rats compared to controls. BF adenosine (ADO), γ-amino-butyric acid (GABA), and glutamate levels were then determined via microdialysis from intact, freely behaving rats following oral ALM, ZOL or VEH. ALM increased BF ADO and GABA levels during waking and mixed vigilance states, and preserved sleep-associated increases in GABA under low and high sleep pressure conditions. ALM infusion into the BF also enhanced cortical ADO release, demonstrating that HCRT input is critical for ADO signaling in the BF. In contrast, oral ZOL and BF-infused ZOL had no effect on ADO levels in either BF or cortex. ALM increased BF ADO (an endogenous sleep-promoting substance) and GABA (which is increased during normal sleep), and required an intact BF for maximal efficacy, whereas ZOL blocked sleep-associated BF GABA release, and required no functional contribution from the BF to induce sleep. ALM thus induces sleep by facilitating the neural mechanisms underlying the normal transition to sleep.
Collapse
Affiliation(s)
- Jacqueline Vazquez-DeRose
- Biosciences Division, Center for Neuroscience, SRI International, 333 Ravenswood Ave., Menlo Park, CA, 94025, USA
| | - Michael D Schwartz
- Biosciences Division, Center for Neuroscience, SRI International, 333 Ravenswood Ave., Menlo Park, CA, 94025, USA
| | - Alexander T Nguyen
- Biosciences Division, Center for Neuroscience, SRI International, 333 Ravenswood Ave., Menlo Park, CA, 94025, USA
| | - Deepti R Warrier
- Biosciences Division, Center for Neuroscience, SRI International, 333 Ravenswood Ave., Menlo Park, CA, 94025, USA
| | - Srishti Gulati
- Biosciences Division, Center for Neuroscience, SRI International, 333 Ravenswood Ave., Menlo Park, CA, 94025, USA
| | - Thomas K Mathew
- Biosciences Division, Center for Neuroscience, SRI International, 333 Ravenswood Ave., Menlo Park, CA, 94025, USA
| | - Thomas C Neylan
- UCSF San Francisco VA Medical Center/NCIRE, San Francisco, CA, 94121, USA
| | - Thomas S Kilduff
- Biosciences Division, Center for Neuroscience, SRI International, 333 Ravenswood Ave., Menlo Park, CA, 94025, USA.
| |
Collapse
|
43
|
Piantadosi PT, Holmes A, Roberts BM, Bailey AM. Orexin receptor activity in the basal forebrain alters performance on an olfactory discrimination task. Brain Res 2014; 1594:215-22. [PMID: 25451124 DOI: 10.1016/j.brainres.2014.10.041] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 10/14/2014] [Accepted: 10/21/2014] [Indexed: 02/07/2023]
Abstract
Cholinergic innervation of the prefrontal cortex is critical for various forms of cognition, although the efferent modulators contributing to acetylcholine (ACh) release are not well understood. The main source of cortical ACh, the basal forebrain, receives projections from lateral and perifornical hypothalamic neurons releasing the peptides orexin (orexin A; OxA, and orexin B; OxB), of which OxA is hypothesized to play a role in various cognitive functions. We sought to assess one such function known to be susceptible to basal forebrain cholinergic manipulation, olfactory discrimination acquisition, and reversal learning, in rats following intra-basal forebrain infusion of OxA or the orexin 1 receptor (OxR1) antagonist SB-334867. OxA administration facilitated, while OxR1 antagonism impaired performance on both the acquisition and reversal portions of the task. These data suggest that orexin acting in the basal forebrain may be important for cortical-dependant executive functions, possibly through the stimulation of cortical ACh release.
Collapse
Affiliation(s)
- Patrick T Piantadosi
- St. Mary's College of Maryland, Department of Psychology, 18952 E. Fisher Road, St. Mary's City, MD 20686-3001, United States.
| | - Ashley Holmes
- St. Mary's College of Maryland, Department of Psychology, 18952 E. Fisher Road, St. Mary's City, MD 20686-3001, United States.
| | - Bradley M Roberts
- St. Mary's College of Maryland, Department of Psychology, 18952 E. Fisher Road, St. Mary's City, MD 20686-3001, United States.
| | - Aileen M Bailey
- St. Mary's College of Maryland, Department of Psychology, 18952 E. Fisher Road, St. Mary's City, MD 20686-3001, United States.
| |
Collapse
|
44
|
Larson-Prior LJ, Ju YE, Galvin JE. Cortical-subcortical interactions in hypersomnia disorders: mechanisms underlying cognitive and behavioral aspects of the sleep-wake cycle. Front Neurol 2014; 5:165. [PMID: 25309500 PMCID: PMC4160996 DOI: 10.3389/fneur.2014.00165] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 08/18/2014] [Indexed: 01/01/2023] Open
Abstract
Subcortical circuits mediating sleep–wake functions have been well characterized in animal models, and corroborated by more recent human studies. Disruptions in these circuits have been identified in hypersomnia disorders (HDs) such as narcolepsy and Kleine–Levin Syndrome, as well as in neurodegenerative disorders expressing excessive daytime sleepiness. However, the behavioral expression of sleep–wake functions is not a simple on-or-off state determined by subcortical circuits, but encompasses a complex range of behaviors determined by the interaction between cortical networks and subcortical circuits. While conceived as disorders of sleep, HDs are equally disorders of wake, representing a fundamental instability in neural state characterized by lapses of alertness during wake. These episodic lapses in alertness and wakefulness are also frequently seen in neurodegenerative disorders where electroencephalogram demonstrates abnormal function in cortical regions associated with cognitive fluctuations (CFs). Moreover, functional connectivity MRI shows instability of cortical networks in individuals with CFs. We propose that the inability to stabilize neural state due to disruptions in the sleep–wake control networks is common to the sleep and cognitive dysfunctions seen in hypersomnia and neurodegenerative disorders.
Collapse
Affiliation(s)
- Linda J Larson-Prior
- Department of Radiology, Washington University School of Medicine , St. Louis, MO , USA ; Department of Neurology, Washington University School of Medicine , St. Louis, MO , USA
| | - Yo-El Ju
- Department of Neurology, Washington University School of Medicine , St. Louis, MO , USA
| | - James E Galvin
- Departments of Neurology, New York University Langone School of Medicine , New York, NY , USA ; Department of Psychiatry, New York University Langone School of Medicine , New York, NY , USA ; Department of Population Health, New York University Langone School of Medicine , New York, NY , USA
| |
Collapse
|
45
|
Wheeler DS, Wan S, Miller A, Angeli N, Adileh B, Hu W, Holland PC. Role of lateral hypothalamus in two aspects of attention in associative learning. Eur J Neurosci 2014; 40:2359-77. [PMID: 24750426 PMCID: PMC4641454 DOI: 10.1111/ejn.12592] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 03/12/2014] [Accepted: 03/17/2014] [Indexed: 11/28/2022]
Abstract
Orexin (hypocretin) and melanin-concentrating hormone (MCH) neurons are unique to the lateral hypothalamic (LH) region, but project throughout the brain. These cell groups have been implicated in a variety of functions, including reward learning, responses to stimulants, and the modulation of attention, arousal and the sleep/wakefulness cycle. Here, we examined roles for LH in two aspects of attention in associative learning shown previously to depend on intact function in major targets of orexin and MCH neurons. In experiments 1 and 2, unilateral orexin-saporin lesions of LH impaired the acquisition of conditioned orienting responses (ORs) and bilaterally suppressed FOS expression in the amygdala central nucleus (CeA) normally observed in response to food cues that provoke conditioned ORs. Those cues also induced greater FOS expression than control cues in LH orexin neurons, but not in MCH neurons. In experiment 3, unilateral orexin-saporin lesions of LH eliminated the cue associability enhancements normally produced by the surprising omission of an expected event. The magnitude of that impairment was positively correlated with the amount of LH damage and with the loss of orexin neurons in particular, but not with the loss of MCH neurons. We suggest that the effects of the LH orexin-saporin lesions were mediated by their effect on information processing in the CeA, known to be critical to both behavioral phenomena examined here. The results imply close relations between LH motivational amplification functions and attention, and may inform our understanding of disorders in which motivational and attentional impairments co-occur.
Collapse
Affiliation(s)
- Daniel S Wheeler
- Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD, 21218, USA
| | | | | | | | | | | | | |
Collapse
|
46
|
de Lecea L, Huerta R. Hypocretin (orexin) regulation of sleep-to-wake transitions. Front Pharmacol 2014; 5:16. [PMID: 24575043 PMCID: PMC3921570 DOI: 10.3389/fphar.2014.00016] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Accepted: 01/27/2014] [Indexed: 12/17/2022] Open
Abstract
The hypocretin (Hcrt), also known as orexin, peptides are essential for arousal stability. Here we discuss background information about the interaction of Hcrt with other neuromodulators, including norepinephrine and acetylcholine probed with optogenetics. We conclude that Hcrt neurons integrate metabolic, circadian and limbic inputs and convey this information to a network of neuromodulators, each of which has a different role on the dynamic of sleep-to-wake transitions. This model may prove useful to predict the effects of orexin receptor antagonists in sleep disorders and other conditions.
Collapse
Affiliation(s)
- Luis de Lecea
- Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Ramón Huerta
- BioCircuits Institute, University of California, San Diego, La Jolla, CA, USA
| |
Collapse
|
47
|
Leonard CS, Kukkonen JP. Orexin/hypocretin receptor signalling: a functional perspective. Br J Pharmacol 2014; 171:294-313. [PMID: 23848055 PMCID: PMC3904253 DOI: 10.1111/bph.12296] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 06/17/2013] [Accepted: 07/03/2013] [Indexed: 10/26/2022] Open
Abstract
Multiple homeostatic systems are regulated by orexin (hypocretin) peptides and their two known GPCRs. Activation of orexin receptors promotes waking and is essential for expression of normal sleep and waking behaviour, with the sleep disorder narcolepsy resulting from the absence of orexin signalling. Orexin receptors also influence systems regulating appetite/metabolism, stress and reward, and are found in several peripheral tissues. Nevertheless, much remains unknown about the signalling pathways and targets engaged by native receptors. In this review, we integrate knowledge about the orexin receptor signalling capabilities obtained from studies in expression systems and various native cell types (as presented in Kukkonen and Leonard, this issue of British Journal of Pharmacology) with knowledge of orexin signalling in different tissues. The tissues reviewed include the CNS, the gastrointestinal tract, the pituitary gland, pancreas, adrenal gland, adipose tissue and the male reproductive system. We also summarize the findings in different native and recombinant cell lines, especially focusing on the different cascades in CHO cells, which is the most investigated cell line. This reveals that while a substantial gap exists between what is known about orexin receptor signalling and effectors in recombinant systems and native systems, mounting evidence suggests that orexin receptor signalling is more diverse than originally thought. Moreover, rather than being restricted to orexin receptor 'overexpressing' cells, this signalling diversity may be utilized by native receptors in a site-specific manner.
Collapse
Affiliation(s)
- C S Leonard
- Department of Physiology, New York Medical College, Valhalla, NY, USA
| | | |
Collapse
|
48
|
Xu TR, Yang Y, Ward R, Gao L, Liu Y. Orexin receptors: Multi-functional therapeutic targets for sleeping disorders, eating disorders, drug addiction, cancers and other physiological disorders. Cell Signal 2013; 25:2413-23. [DOI: 10.1016/j.cellsig.2013.07.025] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2013] [Accepted: 07/26/2013] [Indexed: 12/29/2022]
|
49
|
McKenna JT, Yang C, Franciosi S, Winston S, Abarr KK, Rigby MS, Yanagawa Y, McCarley RW, Brown RE. Distribution and intrinsic membrane properties of basal forebrain GABAergic and parvalbumin neurons in the mouse. J Comp Neurol 2013; 521:1225-50. [PMID: 23254904 DOI: 10.1002/cne.23290] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Revised: 10/31/2012] [Accepted: 12/12/2012] [Indexed: 12/14/2022]
Abstract
The basal forebrain (BF) strongly regulates cortical activation, sleep homeostasis, and attention. Many BF neurons involved in these processes are GABAergic, including a subpopulation of projection neurons containing the calcium-binding protein, parvalbumin (PV). However, technical difficulties in identification have prevented a precise mapping of the distribution of GABAergic and GABA/PV+ neurons in the mouse or a determination of their intrinsic membrane properties. Here we used mice expressing fluorescent proteins in GABAergic (GAD67-GFP knock-in mice) or PV+ neurons (PV-Tomato mice) to study these neurons. Immunohistochemical staining for GABA in GAD67-GFP mice confirmed that GFP selectively labeled BF GABAergic neurons. GFP+ neurons and fibers were distributed throughout the BF, with the highest density in the magnocellular preoptic area (MCPO). Immunohistochemistry for PV indicated that the majority of PV+ neurons in the BF were large (>20 μm) or medium-sized (15-20 μm) GFP+ neurons. Most medium and large-sized BF GFP+ neurons, including those retrogradely labeled from the neocortex, were fast-firing and spontaneously active in vitro. They exhibited prominent hyperpolarization-activated inward currents and subthreshold "spikelets," suggestive of electrical coupling. PV+ neurons recorded in PV-Tomato mice had similar properties but had significantly narrower action potentials and a higher maximal firing frequency. Another population of smaller GFP+ neurons had properties similar to striatal projection neurons. The fast firing and electrical coupling of BF GABA/PV+ neurons, together with their projections to cortical interneurons and the thalamic reticular nucleus, suggest a strong and synchronous control of the neocortical fast rhythms typical of wakefulness and REM sleep.
Collapse
Affiliation(s)
- James T McKenna
- Laboratory of Neuroscience, VA Boston Healthcare System and Harvard Medical School, Department of Psychiatry, Brockton, Massachusetts, 02301, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Takahashi Y, Zhang W, Sameshima K, Kuroki C, Matsumoto A, Sunanaga J, Kono Y, Sakurai T, Kanmura Y, Kuwaki T. Orexin neurons are indispensable for prostaglandin E2-induced fever and defence against environmental cooling in mice. J Physiol 2013; 591:5623-43. [PMID: 23959674 DOI: 10.1113/jphysiol.2013.261271] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
We recently showed using prepro-orexin knockout (ORX-KO) mice and orexin neuron-ablated (ORX-AB) mice that orexin neurons in the hypothalamus, but not orexin peptides per se, are indispensable for stress-induced thermogenesis. To examine whether orexin neurons are more generally involved in central thermoregulatory mechanisms, we applied other forms of thermogenic perturbations, including brain prostaglandin E2 (PGE2) injections which mimic inflammatory fever and environmental cold exposure, to ORX-KO mice, ORX-AB mice and their wild-type (WT) litter mates. ORX-AB mice, but not ORX-KO mice, exhibited a blunted PGE2-induced fever and intolerance to cold (5°C) exposure, and these findings were similar to the results previously obtained with stress-induced thermogenesis. PGE2-induced shivering was also attenuated in ORX-AB mice. Both mutants responded similarly to environmental heating (39°C). In WT and ORX-KO mice, the administration of PGE2 and cold exposure activated orexin neurons, as revealed by increased levels of expression of c-fos. Injection of retrograde tracer into the medullary raphe nucleus revealed direct and indirect projection from the orexin neurons, of which the latter seemed to be preserved in the ORX-AB mice. In addition, we found that glutamate receptor antagonists (D-(-)-2-amino-5-phosphonopentanoic acid and 6-cyano-7-nitroquinoxaline-2,3-dione) but not orexin receptor antagonists (SB334867 and OX2 29) successfully inhibited PGE2-induced fever in WT mice. These results suggest that orexin neurons are important in general thermogenic processes, and their importance is not restricted to stress-induced thermogenesis. In addition, these results indicate the possible involvement of glutamate in orexin neurons implicated in PGE2-induced fever.
Collapse
Affiliation(s)
- Yoshiko Takahashi
- T. Kuwaki: Department of Physiology, Kagoshima University Graduate School of Medical and Dental Sciences, Sakuragaoka 8-35-1, Kagoshima 890-8544, Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|