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Abstract
Neurodegenerative diseases encompass a large group of conditions that are clinically and pathologically diverse yet are linked by a shared pathology of misfolded proteins. The accumulation of insoluble aggregates is accompanied by a progressive loss of vulnerable neurons. For some patients, the symptoms are motor focused (ataxias), while others experience cognitive and psychiatric symptoms (dementias). Among the shared symptoms of neurodegenerative diseases is a disruption of the sleep/wake cycle that occurs early in the trajectory of the disease and may be a risk factor for disease development. In many cases, the disruption in the timing of sleep and other rhythmic physiological markers immediately raises the possibility of neurodegeneration-driven disruption of the circadian timing system. The aim of this Review is to summarize the evidence supporting the hypothesis that circadian disruption is a core symptom within neurodegenerative diseases, including Alzheimer's disease, Huntington's disease, and Parkinson's disease, and to discuss the latest progress in this field. The Review discusses evidence that neurodegenerative processes may disrupt the structure and function of the circadian system and describes circadian-based interventions as well as timed drug treatments that may improve a wide range of symptoms associated with neurodegenerative disorders. It also identifies key gaps in our knowledge.
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Hubbard J, Kobayashi Frisk M, Ruppert E, Tsai JW, Fuchs F, Robin-Choteau L, Husse J, Calvel L, Eichele G, Franken P, Bourgin P. Dissecting and modeling photic and melanopsin effects to predict sleep disturbances induced by irregular light exposure in mice. Proc Natl Acad Sci U S A 2021; 118:e2017364118. [PMID: 34155139 PMCID: PMC8237663 DOI: 10.1073/pnas.2017364118] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Artificial lighting, day-length changes, shift work, and transmeridian travel all lead to sleep-wake disturbances. The nychthemeral sleep-wake cycle (SWc) is known to be controlled by output from the central circadian clock in the suprachiasmatic nuclei (SCN), which is entrained to the light-dark cycle. Additionally, via intrinsically photosensitive retinal ganglion cells containing the photopigment melanopsin (Opn4), short-term light-dark alternations exert direct and acute influences on sleep and waking. However, the extent to which longer exposures typically experienced across the 24-h day exert such an effect has never been clarified or quantified, as disentangling sustained direct light effects (SDLE) from circadian effects is difficult. Recording sleep in mice lacking a circadian pacemaker, either through transgenesis (Syt10cre/creBmal1fl/- ) or SCN lesioning and/or melanopsin-based phototransduction (Opn4-/- ), we uncovered, contrary to prevailing assumptions, that the contribution of SDLE is as important as circadian-driven input in determining SWc amplitude. Specifically, SDLE were primarily mediated (>80%) through melanopsin, of which half were then relayed through the SCN, revealing an ancillary purpose for this structure, independent of its clock function in organizing SWc. Based on these findings, we designed a model to estimate the effect of atypical light-dark cycles on SWc. This model predicted SWc amplitude in mice exposed to simulated transequatorial or transmeridian paradigms. Taken together, we demonstrate this SDLE is a crucial mechanism influencing behavior on par with the circadian system. In a broader context, these findings mandate considering SDLE, in addition to circadian drive, for coping with health consequences of atypical light exposure in our society.
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Affiliation(s)
- Jeffrey Hubbard
- CNRS-Unité Propre de Recherche (UPR) 3212, Institute of Cellular and Integrative Neurosciences, 67084 Strasbourg, France
- International Research Center for ChronoSomnology, Translational Medicine Federation Strasbourg, Sleep Disorders Center, Strasbourg University Hospital, University of Strasbourg, 67000 Strasbourg, France
| | - Mio Kobayashi Frisk
- CNRS-Unité Propre de Recherche (UPR) 3212, Institute of Cellular and Integrative Neurosciences, 67084 Strasbourg, France
- International Research Center for ChronoSomnology, Translational Medicine Federation Strasbourg, Sleep Disorders Center, Strasbourg University Hospital, University of Strasbourg, 67000 Strasbourg, France
| | - Elisabeth Ruppert
- CNRS-Unité Propre de Recherche (UPR) 3212, Institute of Cellular and Integrative Neurosciences, 67084 Strasbourg, France
- International Research Center for ChronoSomnology, Translational Medicine Federation Strasbourg, Sleep Disorders Center, Strasbourg University Hospital, University of Strasbourg, 67000 Strasbourg, France
| | - Jessica W Tsai
- Department of Biology, Stanford University, Stanford, CA 94305
| | - Fanny Fuchs
- CNRS-Unité Propre de Recherche (UPR) 3212, Institute of Cellular and Integrative Neurosciences, 67084 Strasbourg, France
- International Research Center for ChronoSomnology, Translational Medicine Federation Strasbourg, Sleep Disorders Center, Strasbourg University Hospital, University of Strasbourg, 67000 Strasbourg, France
| | - Ludivine Robin-Choteau
- CNRS-Unité Propre de Recherche (UPR) 3212, Institute of Cellular and Integrative Neurosciences, 67084 Strasbourg, France
- European Center for Diabetes Studies, 67200 Strasbourg, France
| | - Jana Husse
- Department of Genes and Behavior, Max Planck Institute for Biophysical Chemistry, 37077 Goettingen, Germany
| | - Laurent Calvel
- CNRS-Unité Propre de Recherche (UPR) 3212, Institute of Cellular and Integrative Neurosciences, 67084 Strasbourg, France
- International Research Center for ChronoSomnology, Translational Medicine Federation Strasbourg, Sleep Disorders Center, Strasbourg University Hospital, University of Strasbourg, 67000 Strasbourg, France
| | - Gregor Eichele
- Department of Genes and Behavior, Max Planck Institute for Biophysical Chemistry, 37077 Goettingen, Germany
| | - Paul Franken
- Center for Integrative Genomics, University of Lausanne, 1015 Lausanne, Switzerland
| | - Patrice Bourgin
- CNRS-Unité Propre de Recherche (UPR) 3212, Institute of Cellular and Integrative Neurosciences, 67084 Strasbourg, France;
- International Research Center for ChronoSomnology, Translational Medicine Federation Strasbourg, Sleep Disorders Center, Strasbourg University Hospital, University of Strasbourg, 67000 Strasbourg, France
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3
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Tran L, Jochum SB, Shaikh M, Wilber S, Zhang L, Hayden DM, Forsyth CB, Voigt RM, Bishehsari F, Keshavarzian A, Swanson GR. Circadian misalignment by environmental light/dark shifting causes circadian disruption in colon. PLoS One 2021; 16:e0251604. [PMID: 34086699 PMCID: PMC8177509 DOI: 10.1371/journal.pone.0251604] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 04/29/2021] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Physiological circadian rhythms (CRs) are complex processes with 24-hour oscillations that regulate diverse biological functions. Chronic weekly light/dark (LD) shifting (CR disruption; CRD) in mice results in colonic hyperpermeability. However, the mechanisms behind this phenomenon are incompletely understood. One potential innovative in vitro method to study colonic CRs are colon organoids. The goals of this study were to utilize circadian clock gene Per2 luciferase reporter (Per2::Luc) mice to measure the effects of chronic LD shifting on colonic tissue circadian rhythmicity ex vivo and to determine if organoids made from shifted mice colons recapitulate the in vivo phenotype. METHODS Non-shifted (NS) and shifted (S) BL6 Per2::Luc mice were compared after a 22-week experiment. NS mice had a standard 12h light/12h dark LD cycle throughout. S mice alternated 12h LD patterns weekly, with light from 6am-6pm one week followed by shifting light to 6pm-6am the next week for 22 weeks. Mice were tested for intestinal permeability while colon tissue and organoids were examined for CRs of bioluminescence and proteins of barrier function and cell fate. RESULTS There was no absolute difference in NS vs. S 24h circadian period or phase. However, chronic LD shifting caused Per2::Luc S mice colon tissue to exhibit significantly greater variability in both the period and phase of Per2::Luc rhythms than NS mice colon tissue and organoids. Chronic LD shifting also resulted in increased colonic permeability of the Per2::Luc mice as well as decreased protein markers of intestinal permeability in colonic tissue and organoids from shifted Per2:Luc mice. CONCLUSIONS Our studies support a model in which chronic central circadian disruption by LD shifting alters the circadian phenotype of the colon tissue and results in colon leakiness and loss of colonic barrier function. These CRD-related changes are stably expressed in colon stem cell derived organoids from CRD mice.
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Affiliation(s)
- Laura Tran
- Rush Medical College, Rush Center for Integrated Microbiome and Chronobiology Research, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Sarah B. Jochum
- Department of Surgery, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Maliha Shaikh
- Rush Medical College, Rush Center for Integrated Microbiome and Chronobiology Research, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Sherry Wilber
- Rush Medical College, Rush Center for Integrated Microbiome and Chronobiology Research, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Lijuan Zhang
- Rush Medical College, Rush Center for Integrated Microbiome and Chronobiology Research, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Dana M. Hayden
- Department of Surgery, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Christopher B. Forsyth
- Rush Medical College, Rush Center for Integrated Microbiome and Chronobiology Research, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Medicine, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Robin M. Voigt
- Rush Medical College, Rush Center for Integrated Microbiome and Chronobiology Research, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Medicine, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Faraz Bishehsari
- Rush Medical College, Rush Center for Integrated Microbiome and Chronobiology Research, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Medicine, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Ali Keshavarzian
- Rush Medical College, Rush Center for Integrated Microbiome and Chronobiology Research, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Medicine, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Garth R. Swanson
- Rush Medical College, Rush Center for Integrated Microbiome and Chronobiology Research, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Medicine, Rush University Medical Center, Chicago, Illinois, United States of America
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Hassan SA, Ali AAH, Yassine M, Sohn D, Pfeffer M, Jänicke RU, Korf HW, von Gall C. Relationship between locomotor activity rhythm and corticosterone levels during HCC development, progression, and treatment in a mouse model. J Pineal Res 2021; 70:e12724. [PMID: 33615553 DOI: 10.1111/jpi.12724] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 02/13/2021] [Accepted: 02/13/2021] [Indexed: 12/27/2022]
Abstract
Cancer-related fatigue (CRF) and stress are common symptoms in cancer patients and represent early side effects of cancer treatment which affect the life quality of the patients. CRF may partly depend on disruption of the circadian rhythm. Locomotor activity and corticosterone rhythms are two important circadian outputs which can be used to analyze possible effects on the circadian function during cancer development and treatment. The present study analyzes the relationship between locomotor activity rhythm, corticosterone levels, hepatocellular carcinoma (HCC) development, and radiotherapy treatment in a mouse model. HCC was induced in mice by single injection of diethylnitrosamine (DEN) and chronic treatment of phenobarbital in drinking water. Another group received chronic phenobarbital treatment only. Tumor bearing animals were divided randomly into four groups irradiated at four different Zeitgeber time points. Spontaneous locomotor activity was recorded continuously; serum corticosterone levels and p-ERK immunoreaction in the suprachiasmatic nucleus (SCN) were investigated. Phenobarbital treated mice showed damped corticosterone levels and a less stable 24 hours activity rhythm as well as an increase in activity during the light phase, reminiscent of sleep disruption. The tumor mice showed an increase in corticosterone level during the inactive phase and decreased activity during the dark phase, reminiscent of CRF. After irradiation, corticosterone levels were further increased and locomotor activity rhythms were disrupted. Lowest corticosterone levels were observed after irradiation during the early light phase; thus, this time might be the best to apply radiotherapy in order to minimize side effects.
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MESH Headings
- Activity Cycles
- Animals
- Behavior, Animal
- Biomarkers/blood
- Carcinoma, Hepatocellular/blood
- Carcinoma, Hepatocellular/chemically induced
- Carcinoma, Hepatocellular/physiopathology
- Carcinoma, Hepatocellular/radiotherapy
- Chronotherapy
- Circadian Rhythm
- Corticosterone/blood
- Diethylnitrosamine
- Disease Progression
- Extracellular Signal-Regulated MAP Kinases/metabolism
- Liver Neoplasms, Experimental/blood
- Liver Neoplasms, Experimental/chemically induced
- Liver Neoplasms, Experimental/physiopathology
- Liver Neoplasms, Experimental/radiotherapy
- Locomotion
- Male
- Mice, Inbred C57BL
- Mice, Transgenic
- Period Circadian Proteins/genetics
- Phenobarbital
- Phosphorylation
- Suprachiasmatic Nucleus/metabolism
- Suprachiasmatic Nucleus/physiopathology
- Time Factors
- Mice
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Affiliation(s)
- Soha A Hassan
- Institute of Anatomy II, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany
- Zoology Department, Faculty of Science, Suez University, Suez, Egypt
| | - Amira A H Ali
- Institute of Anatomy II, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany
| | - Mona Yassine
- Institute of Anatomy II, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany
| | - Dennis Sohn
- Laboratory of Molecular Radiooncology, Clinic and Policlinic for Radiation Therapy and Radiooncology, Medical Faculty of Heinrich-Heine-University, Düsseldorf, Germany
| | - Martina Pfeffer
- Institute of Anatomy II, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany
| | - Reiner U Jänicke
- Laboratory of Molecular Radiooncology, Clinic and Policlinic for Radiation Therapy and Radiooncology, Medical Faculty of Heinrich-Heine-University, Düsseldorf, Germany
| | - Horst-Werner Korf
- Institute of Anatomy I, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany
| | - Charlotte von Gall
- Institute of Anatomy II, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany
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Myung J, Wu MY, Lee CY, Rahim AR, Truong VH, Wu D, Piggins HD, Wu MS. The Kidney Clock Contributes to Timekeeping by the Master Circadian Clock. Int J Mol Sci 2019; 20:ijms20112765. [PMID: 31195684 PMCID: PMC6600447 DOI: 10.3390/ijms20112765] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 06/01/2019] [Accepted: 06/03/2019] [Indexed: 01/11/2023] Open
Abstract
The kidney harbors one of the strongest circadian clocks in the body. Kidney failure has long been known to cause circadian sleep disturbances. Using an adenine-induced model of chronic kidney disease (CKD) in mice, we probe the possibility that such sleep disturbances originate from aberrant circadian rhythms in kidney. Under the CKD condition, mice developed unstable behavioral circadian rhythms. When observed in isolation in vitro, the pacing of the master clock, the suprachiasmatic nucleus (SCN), remained uncompromised, while the kidney clock became a less robust circadian oscillator with a longer period. We find this analogous to the silencing of a strong slave clock in the brain, the choroid plexus, which alters the pacing of the SCN. We propose that the kidney also contributes to overall circadian timekeeping at the whole-body level, through bottom-up feedback in the hierarchical structure of the mammalian circadian clocks.
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Affiliation(s)
- Jihwan Myung
- Graduate Institute of Mind, Brain and Consciousness, Taipei Medical University, Taipei 11031, Taiwan.
- Brain and Consciousness Research Center, Taipei Medical University-Shuang Ho Hospital, New Taipei City 23561, Taiwan.
- Laboratory of Braintime, Taipei Medical University, Taipei 11031 & Shuang Ho Hospital, New Taipei City 23561, Taiwan.
- Computational Neuroscience Unit, Okinawa Institute of Science and Technology, Okinawa 904-0495, Japan.
| | - Mei-Yi Wu
- Division of Nephrology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, Taipei 11031, Taiwan.
- Division of Nephrology, Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan.
- Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei 10672, Taiwan.
| | - Chun-Ya Lee
- Laboratory of Braintime, Taipei Medical University, Taipei 11031 & Shuang Ho Hospital, New Taipei City 23561, Taiwan.
- Division of Nephrology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, Taipei 11031, Taiwan.
| | - Amalia Ridla Rahim
- Graduate Institute of Mind, Brain and Consciousness, Taipei Medical University, Taipei 11031, Taiwan.
- Brain and Consciousness Research Center, Taipei Medical University-Shuang Ho Hospital, New Taipei City 23561, Taiwan.
- Laboratory of Braintime, Taipei Medical University, Taipei 11031 & Shuang Ho Hospital, New Taipei City 23561, Taiwan.
| | - Vuong Hung Truong
- Graduate Institute of Mind, Brain and Consciousness, Taipei Medical University, Taipei 11031, Taiwan.
- Brain and Consciousness Research Center, Taipei Medical University-Shuang Ho Hospital, New Taipei City 23561, Taiwan.
- Laboratory of Braintime, Taipei Medical University, Taipei 11031 & Shuang Ho Hospital, New Taipei City 23561, Taiwan.
| | - Dean Wu
- Department of Neurology, Shuang Ho Hospital, New Taipei City 23561, Taiwan.
- Department of Neurology, Taipei Medical University, Taipei 11031, Taiwan.
| | - Hugh David Piggins
- School of Physiology, Pharmacology, and Neuroscience, Faculty of Life Sciences, University of Bristol, Biomedical Sciences Building, University Walk, Bristol BS8 1TD, UK.
| | - Mai-Szu Wu
- Division of Nephrology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, Taipei 11031, Taiwan.
- Division of Nephrology, Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan.
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Gu CG, Wang P, Weng TF, Yang HJ, Rohling J. Heterogeneity of neuronal properties determines the collective behavior of the neurons in the suprachiasmatic nucleus. Math Biosci Eng 2019; 16:1893-1913. [PMID: 31137191 DOI: 10.3934/mbe.2019092] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Circadian rhythms have been observed in behavioral and physiological activities of living things exposed to the natural 24 h light-darkness cycle. Interestingly, even under constant darkness, living organisms maintain a robust endogenous circadian rhythm suggesting the existence of an endogenous clock. In mammals, the endogenous clock is located in the suprachiasmatic nucleus (SCN) which is composed of about 20,000 neuronal oscillators. These neuronal oscillators are heterogeneous in their properties, including the intrinsic period, intrinsic amplitude, light information sensitivity, cellular coupling strength, intrinsic amplitudes and the topological links. In this review, we introduce the influence of the heterogeneity of these properties on the two main functions of the SCN, i.e. the free running rhythm in constant darkness and entrainment to the external cycle, based on mathematical models where heterogeneous neuronal oscillators are coupled to form a network. Our findings show that the heterogeneities can alter the free running periods under constant darkness and the entrainment ability to the external cycle for the SCN by controlling a fine balance between flexibility and robustness of the clock. These findings can explain experimental observation, e.g., why the free running periods and entrainment abilities are different between species, and shed light on the heterogeneity of the SCN network.
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Affiliation(s)
- Chang Gui Gu
- Business School, University of Shanghai for Science and Technology, Shanghai 200093, P.R. China
| | - Ping Wang
- Business School, University of Shanghai for Science and Technology, Shanghai 200093, P.R. China
| | - Tong Feng Weng
- Business School, University of Shanghai for Science and Technology, Shanghai 200093, P.R. China
| | - Hui Jie Yang
- Business School, University of Shanghai for Science and Technology, Shanghai 200093, P.R. China
| | - Jos Rohling
- Department of Cell and Chemical Biology, Laboratory for Neurophysiology, Leiden University Medical Center, Leiden, 2300 RC, The Netherlands
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Timothy JWS, Klas N, Sanghani HR, Al-Mansouri T, Hughes ATL, Kirshenbaum GS, Brienza V, Belle MDC, Ralph MR, Clapcote SJ, Piggins HD. Circadian Disruptions in the Myshkin Mouse Model of Mania Are Independent of Deficits in Suprachiasmatic Molecular Clock Function. Biol Psychiatry 2018; 84:827-837. [PMID: 28689605 PMCID: PMC6218650 DOI: 10.1016/j.biopsych.2017.04.018] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Revised: 04/06/2017] [Accepted: 04/27/2017] [Indexed: 11/25/2022]
Abstract
BACKGROUND Alterations in environmental light and intrinsic circadian function have strong associations with mood disorders. The neural origins underpinning these changes remain unclear, although genetic deficits in the molecular clock regularly render mice with altered mood-associated phenotypes. METHODS A detailed circadian and light-associated behavioral characterization of the Na+/K+-ATPase α3 Myshkin (Myk/+) mouse model of mania was performed. Na+/K+-ATPase α3 does not reside within the core circadian molecular clockwork, but Myk/+ mice exhibit concomitant disruption in circadian rhythms and mood. The neural basis of this phenotype was investigated through molecular and electrophysiological dissection of the master circadian pacemaker, the suprachiasmatic nuclei (SCN). Light input and glutamatergic signaling to the SCN were concomitantly assessed through behavioral assays and calcium imaging. RESULTS In vivo assays revealed several circadian abnormalities including lengthened period and instability of behavioral rhythms, and elevated metabolic rate. Grossly aberrant responses to light included accentuated resetting, accelerated re-entrainment, and an absence of locomotor suppression. Bioluminescent recording of circadian clock protein (PERIOD2) output from ex vivo SCN revealed no deficits in Myk/+ molecular clock function. Optic nerve crush rescued the circadian period of Myk/+ behavior, highlighting that afferent inputs are critical upstream mediators. Electrophysiological and calcium imaging SCN recordings demonstrated changes in the response to glutamatergic stimulation as well as the electrical output indicative of altered retinal input processing. CONCLUSIONS The Myshkin model demonstrates profound circadian and light-responsive behavioral alterations independent of molecular clock disruption. Afferent light signaling drives behavioral changes and raises new mechanistic implications for circadian disruption in affective disorders.
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Affiliation(s)
- Joseph W S Timothy
- Faculty of Biology, Medicine, and Health, University of Manchester, Manchester
| | - Natasza Klas
- Faculty of Biology, Medicine, and Health, University of Manchester, Manchester
| | | | | | - Alun T L Hughes
- Faculty of Biology, Medicine, and Health, University of Manchester, Manchester
| | - Greer S Kirshenbaum
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
| | - Vincent Brienza
- Department of Psychology, University of Toronto, Toronto, Canada
| | - Mino D C Belle
- Faculty of Biology, Medicine, and Health, University of Manchester, Manchester
| | - Martin R Ralph
- Department of Psychology, University of Toronto, Toronto, Canada
| | - Steven J Clapcote
- School of Biomedical Sciences, University of Leeds, Leeds, United Kingdom
| | - Hugh D Piggins
- Faculty of Biology, Medicine, and Health, University of Manchester, Manchester.
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8
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Báez-Ruiz A, Guerrero-Vargas NN, Cázarez-Márquez F, Sabath E, Basualdo MDC, Salgado-Delgado R, Escobar C, Buijs RM. Food in synchrony with melatonin and corticosterone relieves constant light disturbed metabolism. J Endocrinol 2017; 235:167-178. [PMID: 28851750 DOI: 10.1530/joe-17-0370] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2017] [Accepted: 08/29/2017] [Indexed: 12/22/2022]
Abstract
Circadian disruption is associated with metabolic disturbances such as hepatic steatosis (HS), obesity and type 2 diabetes. We hypothesized that HS, resulting from constant light (LL) exposure is due to an inconsistency between signals related to food intake and endocrine-driven suprachiasmatic nucleus (SCN) outputs. Indeed, exposing rats to LL induced locomotor, food intake and hormone arrhythmicity together with the development of HS. We investigated whether providing temporal signals such as 12-h food availability or driving a corticosterone plus melatonin rhythm could restore rhythmicity and prevent the metabolic disturbances under LL conditions in male rats. Discrete metabolic improvements under these separate treatments stimulated us to investigate whether the combination of hormone treatment together with mealtime restriction (12-h food during four weeks) could prevent the metabolic alterations. LL exposed arrhythmic rats, received daily administration of corticosterone (2.5 µg/kg) and melatonin (2.5 mg/kg) in synchrony or out of synchrony with their 12-h meal. HS and other metabolic alterations were importantly ameliorated in LL-exposed rats receiving hormonal treatment in synchrony with 12-h restricted mealtime, while treatment out of phase with meal time did not. Interestingly, liver bile acids, a major indication for HS, were only normalized when animals received hormones in synchrony with food indicating that disrupted bile acid metabolism might be an important mechanism for the HS induction under LL conditions. We conclude that food-elicited signals, as well as hormonal signals, are necessary for liver synchronization and that HS arises when there is conflict between food intake and the normal pattern of melatonin and corticosterone.
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Affiliation(s)
- Adrián Báez-Ruiz
- Department of Physiology and Cellular BiologyBiomedical Research Institute, UNAM, DF, México
- Department of Cellular PhysiologyFaculty of Science, UASLP, San Luis Potosí, México
| | - Natalí N Guerrero-Vargas
- Department of Physiology and Cellular BiologyBiomedical Research Institute, UNAM, DF, México
- Department of AnatomyFaculty of Medicine, UNAM, DF, México
| | | | - Elizabeth Sabath
- Department of Physiology and Cellular BiologyBiomedical Research Institute, UNAM, DF, México
| | | | | | | | - Ruud M Buijs
- Department of Physiology and Cellular BiologyBiomedical Research Institute, UNAM, DF, México
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9
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Landgraf D, Long JE, Proulx CD, Barandas R, Malinow R, Welsh DK. Genetic Disruption of Circadian Rhythms in the Suprachiasmatic Nucleus Causes Helplessness, Behavioral Despair, and Anxiety-like Behavior in Mice. Biol Psychiatry 2016; 80:827-835. [PMID: 27113500 PMCID: PMC5102810 DOI: 10.1016/j.biopsych.2016.03.1050] [Citation(s) in RCA: 126] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Revised: 03/04/2016] [Accepted: 03/04/2016] [Indexed: 11/19/2022]
Abstract
BACKGROUND Major depressive disorder is associated with disturbed circadian rhythms. To investigate the causal relationship between mood disorders and circadian clock disruption, previous studies in animal models have employed light/dark manipulations, global mutations of clock genes, or brain area lesions. However, light can impact mood by noncircadian mechanisms; clock genes have pleiotropic, clock-independent functions; and brain lesions not only disrupt cellular circadian rhythms but also destroy cells and eliminate important neuronal connections, including light reception pathways. Thus, a definitive causal role for functioning circadian clocks in mood regulation has not been established. METHODS We stereotactically injected viral vectors encoding short hairpin RNA to knock down expression of the essential clock gene Bmal1 into the brain's master circadian pacemaker, the suprachiasmatic nucleus (SCN). RESULTS In these SCN-specific Bmal1-knockdown (SCN-Bmal1-KD) mice, circadian rhythms were greatly attenuated in the SCN, while the mice were maintained in a standard light/dark cycle, SCN neurons remained intact, and neuronal connections were undisturbed, including photic inputs. In the learned helplessness paradigm, the SCN-Bmal1-KD mice were slower to escape, even before exposure to inescapable stress. They also spent more time immobile in the tail suspension test and less time in the lighted section of a light/dark box. The SCN-Bmal1-KD mice also showed greater weight gain, an abnormal circadian pattern of corticosterone, and an attenuated increase of corticosterone in response to stress. CONCLUSIONS Disrupting SCN circadian rhythms is sufficient to cause helplessness, behavioral despair, and anxiety-like behavior in mice, establishing SCN-Bmal1-KD mice as a new animal model of depression.
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Affiliation(s)
- Dominic Landgraf
- Veterans Affairs San Diego Healthcare System, San Diego; Department of Psychiatry and Center for Circadian Biology, University of California, San Diego, La Jolla, California.
| | - Jaimie E Long
- Veterans Affairs San Diego Healthcare System, San Diego; Department of Psychiatry and Center for Circadian Biology, University of California, San Diego, La Jolla, California
| | - Christophe D Proulx
- Department of Neurosciences, University of California, San Diego, La Jolla, California
| | - Rita Barandas
- Veterans Affairs San Diego Healthcare System, San Diego; Department of Psychiatry and Center for Circadian Biology, University of California, San Diego, La Jolla, California; Department of Psychiatry, Hospital de Santa Maria, Centro Hospitalar Lisboa Norte, University of Lisbon, Lisbon, Portugal; Faculty of Medicine, University of Lisbon, Lisbon, Portugal
| | - Roberto Malinow
- Department of Neurosciences, University of California, San Diego, La Jolla, California
| | - David K Welsh
- Veterans Affairs San Diego Healthcare System, San Diego; Department of Psychiatry and Center for Circadian Biology, University of California, San Diego, La Jolla, California
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10
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Abstract
Disruptions of normal circadian rhythms and sleep cycles are consequences of aging and can profoundly affect health. Accumulating evidence indicates that circadian and sleep disturbances, which have long been considered symptoms of many neurodegenerative conditions, may actually drive pathogenesis early in the course of these diseases. In this Review, we explore potential cellular and molecular mechanisms linking circadian dysfunction and sleep loss to neurodegenerative diseases, with a focus on Alzheimer's disease. We examine the interplay between central and peripheral circadian rhythms, circadian clock gene function, and sleep in maintaining brain homeostasis, and discuss therapeutic implications. The circadian clock and sleep can influence a number of key processes involved in neurodegeneration, suggesting that these systems might be manipulated to promote healthy brain aging.
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Affiliation(s)
- Erik S Musiek
- Department of Neurology, Hope Center for Neurological Disorders, and Knight Alzheimer Disease Research Center, Washington University School of Medicine, St. Louis, MO 63110, USA.
| | - David M Holtzman
- Department of Neurology, Hope Center for Neurological Disorders, and Knight Alzheimer Disease Research Center, Washington University School of Medicine, St. Louis, MO 63110, USA
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11
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Fifel K. Alterations of the circadian system in Parkinson's disease patients. Mov Disord 2016; 32:682-692. [PMID: 27859638 DOI: 10.1002/mds.26865] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 09/28/2016] [Accepted: 10/05/2016] [Indexed: 01/21/2023] Open
Abstract
Alterations of circadian rhythms are among the most debilitating non-motor symptoms in Parkinson's Disease (PD). Although a growing awareness towards these symptoms has occurred during the last decade, their underlying neuropathophysiology remains poorly understood and consequently no effective therapeutic strategies are available to alleviate these problems. Recent studies have investigated multiple circadian rhythms at different stages of PD. The advances made have allowed an accurate evaluation of the affected underlying pathways and mechanisms. Here I dissect, over disease progression, the relative causal contribution to health impairments in PD patients of dysfunctions in the different components of the neural network governing circadian rhythms. A deeper understanding of these mechanisms will provide not only a greater understanding of disease neuropathology, but also hold the promise for effective therapies. © 2016 International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Karim Fifel
- Laboratory of Neurophysiology, Department of Molecular Cell Biology, Leiden University Medical Center, Leiden, The Netherlands
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12
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Lu Z, Klein-Cardeña K, Lee S, Antonsen TM, Girvan M, Ott E. Resynchronization of circadian oscillators and the east-west asymmetry of jet-lag. Chaos 2016; 26:094811. [PMID: 27781473 DOI: 10.1063/1.4954275] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Cells in the brain's Suprachiasmatic Nucleus (SCN) are known to regulate circadian rhythms in mammals. We model synchronization of SCN cells using the forced Kuramoto model, which consists of a large population of coupled phase oscillators (modeling individual SCN cells) with heterogeneous intrinsic frequencies and external periodic forcing. Here, the periodic forcing models diurnally varying external inputs such as sunrise, sunset, and alarm clocks. We reduce the dimensionality of the system using the ansatz of Ott and Antonsen and then study the effect of a sudden change of clock phase to simulate cross-time-zone travel. We estimate model parameters from previous biological experiments. By examining the phase space dynamics of the model, we study the mechanism leading to the difference typically experienced in the severity of jet-lag resulting from eastward and westward travel.
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Affiliation(s)
- Zhixin Lu
- Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA
| | - Kevin Klein-Cardeña
- Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA
| | - Steven Lee
- Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA
| | - Thomas M Antonsen
- Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA
| | - Michelle Girvan
- Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA
| | - Edward Ott
- Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA
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13
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Kuljis DA, Gad L, Loh DH, MacDowell Kaswan Z, Hitchcock ON, Ghiani CA, Colwell CS. Sex Differences in Circadian Dysfunction in the BACHD Mouse Model of Huntington's Disease. PLoS One 2016; 11:e0147583. [PMID: 26871695 PMCID: PMC4752447 DOI: 10.1371/journal.pone.0147583] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 01/04/2016] [Indexed: 12/19/2022] Open
Abstract
Huntington's disease (HD) is an autosomal dominant neurodegenerative disorder that affects men and women in equal numbers, but some epidemiological studies indicate there may be sex differences in disease progression. One of the early symptoms of HD is disruptions in the circadian timing system, but it is currently unknown whether sex is a factor in these alterations. Since sex differences in HD could provide important insights to understand cellular and molecular mechanism(s) and designing early intervention strategies, we used the bacterial artificial chromosome transgenic mouse model of HD (BACHD) to examine whether sex differences in circadian behavioral rhythms are detectable in an animal model of the disease. Similar to BACHD males, BACHD females display circadian disruptions at both 3 and 6 months of age; however, deficits to BACHD female mouse activity levels, rhythm precision, and behavioral fragmentation are either delayed or less severe relative to males. These sex differences are associated with a smaller suprachiasmatic nucleus (SCN) in BACHD male mice at age of symptom onset (3 months), but are not associated with sex-specific differences in SCN daytime electrical activity deficits, or peptide expression (arginine vasopressin, vasoactive intestinal peptide) within the SCN. Notably, BACHD females exhibited delayed motor coordination deficits, as measured using rotarod and challenge beam. These findings suggest a sex specific factor plays a role both in non-motor and motor symptom progression for the BACHD mouse.
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Affiliation(s)
- Dika A. Kuljis
- Department of Neurobiology, University of California Los Angeles, Los Angeles, California, United States of America
| | - Laura Gad
- Department of Psychiatry & Biobehavioral Sciences, University of California Los Angeles, Los Angeles, California, United States of America
| | - Dawn H. Loh
- Department of Psychiatry & Biobehavioral Sciences, University of California Los Angeles, Los Angeles, California, United States of America
| | - Zoë MacDowell Kaswan
- Department of Psychiatry & Biobehavioral Sciences, University of California Los Angeles, Los Angeles, California, United States of America
| | - Olivia N. Hitchcock
- Department of Psychiatry & Biobehavioral Sciences, University of California Los Angeles, Los Angeles, California, United States of America
| | - Cristina A. Ghiani
- Department of Psychiatry & Biobehavioral Sciences, University of California Los Angeles, Los Angeles, California, United States of America
- Department of Pathology and Laboratory Medicine, University of California Los Angeles, Los Angeles, California, United States of America
| | - Christopher S. Colwell
- Department of Psychiatry & Biobehavioral Sciences, University of California Los Angeles, Los Angeles, California, United States of America
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14
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Suter PM. [Circadian rhythms and chronic diseases]. Praxis (Bern 1994) 2015; 104:1265-1270. [PMID: 26558932 DOI: 10.1024/1661-8157/a002178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Everything in nature and life is occurring in a rhythmic manner. The major “Zeitgeber” is the change of light and dark during a 24 h day. This circadian rhythm is besides others reflected in circadian rhythms of behaviors or different biochemical parameters. A disruption of the circadian rhythm has a high pathophysiological potential. In this article a few basic issues about the role of circadian rhythms and the pathophysiological importance of desynchronisation are reviewed.
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Affiliation(s)
- Paolo M Suter
- 1 Klinik und Poliklinik für Innere Medizin, Universitätsspital Zürich
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15
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Coomans CP, Lucassen EA, Kooijman S, Fifel K, Deboer T, Rensen PCN, Michel S, Meijer JH. Plasticity of circadian clocks and consequences for metabolism. Diabetes Obes Metab 2015; 17 Suppl 1:65-75. [PMID: 26332970 DOI: 10.1111/dom.12513] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Accepted: 05/17/2015] [Indexed: 12/11/2022]
Abstract
The increased prevalence of metabolic disorders and obesity in modern society, together with the widespread use of artificial light at night, have led researchers to investigate whether altered patterns of light exposure contribute to metabolic disorders. This article discusses the experimental evidence that perturbed environmental cycles induce rhythm disorders in the circadian system, thus leading to metabolic disorders. This notion is generally supported by animal studies. Distorted environmental cycles, including continuous exposure to light, affect the neuronal organization of the central circadian pacemaker in the suprachiasmatic nucleus (SCN), its waveform and amplitude of the rhythm in electrical activity. Moreover, repeated exposure to a shifted light cycle or the application of dim light at night are environmental cues that cause a change in SCN function. The effects on the SCN waveform are the result of changes in synchronization among the SCN's neuronal cell population, which lead consistently to metabolic disturbances. Furthermore, we discuss the effects of sleep deprivation and the time of feeding on metabolism, as these factors are associated with exposure to disturbed environmental cycles. Finally, we suggest that these experimental studies reveal a causal relationship between the rhythm disorders and the metabolic disorders observed in epidemiological studies performed in humans.
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Affiliation(s)
- C P Coomans
- Department of Molecular Cell Biology, Laboratory for Neurophysiology, Leiden University Medical Center, Leiden, Netherlands
| | - E A Lucassen
- Department of Molecular Cell Biology, Laboratory for Neurophysiology, Leiden University Medical Center, Leiden, Netherlands
| | - S Kooijman
- Department of Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, Netherlands
- Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, Netherlands
| | - K Fifel
- Department of Molecular Cell Biology, Laboratory for Neurophysiology, Leiden University Medical Center, Leiden, Netherlands
| | - T Deboer
- Department of Molecular Cell Biology, Laboratory for Neurophysiology, Leiden University Medical Center, Leiden, Netherlands
| | - P C N Rensen
- Department of Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, Netherlands
- Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, Netherlands
| | - S Michel
- Department of Molecular Cell Biology, Laboratory for Neurophysiology, Leiden University Medical Center, Leiden, Netherlands
| | - J H Meijer
- Department of Molecular Cell Biology, Laboratory for Neurophysiology, Leiden University Medical Center, Leiden, Netherlands
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16
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Versteeg RI, Serlie MJ, Kalsbeek A, la Fleur SE. Serotonin, a possible intermediate between disturbed circadian rhythms and metabolic disease. Neuroscience 2015; 301:155-67. [PMID: 26047725 DOI: 10.1016/j.neuroscience.2015.05.067] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Revised: 05/21/2015] [Accepted: 05/27/2015] [Indexed: 01/27/2023]
Abstract
It is evident that eating in misalignment with the biological clock (such as in shift work, eating late at night and skipping breakfast) is associated with increased risk for obesity and diabetes. The biological clock located in the suprachiasmatic nucleus dictates energy balance including feeding behavior and glucose metabolism. Besides eating and sleeping patterns, glucose metabolism also exhibits clear diurnal variations with higher blood glucose concentrations, glucose tolerance and insulin sensitivity prior to waking up. The daily variation in plasma glucose concentrations in rats, is independent of the rhythm in feeding behavior. On the other hand, feeding itself has profound effects on glucose metabolism, but differential effects occur depending on the time of the day. We here review data showing that a disturbed diurnal eating pattern results in alterations in glucose metabolism induced by a disrupted circadian clock. We first describe the role of central serotonin on feeding behavior and glucose metabolism and subsequently describe the effects of central serotonin on the circadian system. We next explore the interaction between the serotonergic system and the circadian clock in conditions of disrupted diurnal rhythms in feeding and how this might be involved in the metabolic dysregulation that occurs with chronodisruption.
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Affiliation(s)
- R I Versteeg
- Department of Endocrinology and Metabolism, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - M J Serlie
- Department of Endocrinology and Metabolism, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - A Kalsbeek
- Department of Endocrinology and Metabolism, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands; Hypothalamic Integration Mechanisms, Netherlands Institute for Neuroscience, Amsterdam, The Netherlands
| | - S E la Fleur
- Department of Endocrinology and Metabolism, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
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17
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Joustra SD, Thijs RD, van den Berg R, van Dijk M, Pereira AM, Lammers GJ, van Someren EJW, Romijn JA, Biermasz NR. Alterations in diurnal rhythmicity in patients treated for nonfunctioning pituitary macroadenoma: a controlled study and literature review. Eur J Endocrinol 2014; 171:217-28. [PMID: 24826835 DOI: 10.1530/eje-14-0172] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE Patients treated for nonfunctioning pituitary macroadenomas (NFMAs) have fatigue and alterations in sleep characteristics and sleep-wake rhythmicity frequently. As NFMAs often compress the optic chiasm, these complaints might be related to dysfunction of the adjacent suprachiasmatic nucleus (SCN). We aimed to explore whether indirect indices of SCN functioning are altered in the long term after surgery for NFMAs. METHODS We studied 17 NFMA patients in long-term remission after transsphenoidal surgery, receiving adequate and stable hormone replacement for hypopituitarism, and 17 control subjects matched for age, gender, and BMI. Indirect indices of SCN function were assessed from 24-h ambulatory recordings of skin and core body temperatures, blood pressure, and salivary melatonin levels. Altered melatonin secretion was defined as an absence of evening rise, considerable irregularity, or daytime values >3 pg/ml. We additionally studied eight patients treated for craniopharyngioma. RESULTS Distal-proximal skin temperature gradient did not differ between NFMAs and control subjects, but proximal skin temperature was decreased during daytime (P=0.006). Core body temperature and non-dipping of blood pressure did not differ, whereas melatonin secretion was often altered in NFMAs (OR 5.3, 95% CI 0.9-30.6). One or more abnormal parameters (≥2.0 SDS of control subjects) were observed during nighttime in 12 NFMA patients and during daytime in seven NFMA patients. Similar patterns were observed in craniopharyngioma patients. CONCLUSION Heterogeneous patterns of altered diurnal rhythmicity in skin temperature and melatonin secretion parameters were observed in the majority of patients treated for NFMAs. On a group level, both NFMA and craniopharyngioma patients showed a lower daytime proximal skin temperature than control subjects, but other group averages were not significantly different. The observations suggest altered function of central (or peripheral) clock machinery, possibly by disturbed entrainment or damage of the hypothalamic SCN by the suprasellar macroadenoma or its treatment.
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Affiliation(s)
- S D Joustra
- Center for Endocrine Tumors LeidenDepartment of Endocrinology and MetabolismDepartment of NeurologyLeiden University Medical Center, Albinusdreef 2, 2333ZA Leiden, The NetherlandsStichting Epilepsie Instellingen Nederland (SEIN)Achterweg 5, 2103SW Heemstede, The NetherlandsDepartment of Sleep and CognitionNetherlands Institute for Neuroscience, Meibergdreef 47, 1105BA Amsterdam, The NetherlandsNeuroscience Campus AmsterdamDepartments of Integrative Neurophysiology and Medical Psychology, VU University and Medical Center, De Boelelaan 1117, 1081HZ Amsterdam, The Netherlands
| | - R D Thijs
- Center for Endocrine Tumors LeidenDepartment of Endocrinology and MetabolismDepartment of NeurologyLeiden University Medical Center, Albinusdreef 2, 2333ZA Leiden, The NetherlandsStichting Epilepsie Instellingen Nederland (SEIN)Achterweg 5, 2103SW Heemstede, The NetherlandsDepartment of Sleep and CognitionNetherlands Institute for Neuroscience, Meibergdreef 47, 1105BA Amsterdam, The NetherlandsNeuroscience Campus AmsterdamDepartments of Integrative Neurophysiology and Medical Psychology, VU University and Medical Center, De Boelelaan 1117, 1081HZ Amsterdam, The NetherlandsCenter for Endocrine Tumors LeidenDepartment of Endocrinology and MetabolismDepartment of NeurologyLeiden University Medical Center, Albinusdreef 2, 2333ZA Leiden, The NetherlandsStichting Epilepsie Instellingen Nederland (SEIN)Achterweg 5, 2103SW Heemstede, The NetherlandsDepartment of Sleep and CognitionNetherlands Institute for Neuroscience, Meibergdreef 47, 1105BA Amsterdam, The NetherlandsNeuroscience Campus AmsterdamDepartments of Integrative Neurophysiology and Medical Psychology, VU University and Medical Center, De Boelelaan 1117, 1081HZ Amsterdam, The Netherlands
| | - R van den Berg
- Center for Endocrine Tumors LeidenDepartment of Endocrinology and MetabolismDepartment of NeurologyLeiden University Medical Center, Albinusdreef 2, 2333ZA Leiden, The NetherlandsStichting Epilepsie Instellingen Nederland (SEIN)Achterweg 5, 2103SW Heemstede, The NetherlandsDepartment of Sleep and CognitionNetherlands Institute for Neuroscience, Meibergdreef 47, 1105BA Amsterdam, The NetherlandsNeuroscience Campus AmsterdamDepartments of Integrative Neurophysiology and Medical Psychology, VU University and Medical Center, De Boelelaan 1117, 1081HZ Amsterdam, The Netherlands
| | - M van Dijk
- Center for Endocrine Tumors LeidenDepartment of Endocrinology and MetabolismDepartment of NeurologyLeiden University Medical Center, Albinusdreef 2, 2333ZA Leiden, The NetherlandsStichting Epilepsie Instellingen Nederland (SEIN)Achterweg 5, 2103SW Heemstede, The NetherlandsDepartment of Sleep and CognitionNetherlands Institute for Neuroscience, Meibergdreef 47, 1105BA Amsterdam, The NetherlandsNeuroscience Campus AmsterdamDepartments of Integrative Neurophysiology and Medical Psychology, VU University and Medical Center, De Boelelaan 1117, 1081HZ Amsterdam, The Netherlands
| | - A M Pereira
- Center for Endocrine Tumors LeidenDepartment of Endocrinology and MetabolismDepartment of NeurologyLeiden University Medical Center, Albinusdreef 2, 2333ZA Leiden, The NetherlandsStichting Epilepsie Instellingen Nederland (SEIN)Achterweg 5, 2103SW Heemstede, The NetherlandsDepartment of Sleep and CognitionNetherlands Institute for Neuroscience, Meibergdreef 47, 1105BA Amsterdam, The NetherlandsNeuroscience Campus AmsterdamDepartments of Integrative Neurophysiology and Medical Psychology, VU University and Medical Center, De Boelelaan 1117, 1081HZ Amsterdam, The Netherlands
| | - G J Lammers
- Center for Endocrine Tumors LeidenDepartment of Endocrinology and MetabolismDepartment of NeurologyLeiden University Medical Center, Albinusdreef 2, 2333ZA Leiden, The NetherlandsStichting Epilepsie Instellingen Nederland (SEIN)Achterweg 5, 2103SW Heemstede, The NetherlandsDepartment of Sleep and CognitionNetherlands Institute for Neuroscience, Meibergdreef 47, 1105BA Amsterdam, The NetherlandsNeuroscience Campus AmsterdamDepartments of Integrative Neurophysiology and Medical Psychology, VU University and Medical Center, De Boelelaan 1117, 1081HZ Amsterdam, The NetherlandsCenter for Endocrine Tumors LeidenDepartment of Endocrinology and MetabolismDepartment of NeurologyLeiden University Medical Center, Albinusdreef 2, 2333ZA Leiden, The NetherlandsStichting Epilepsie Instellingen Nederland (SEIN)Achterweg 5, 2103SW Heemstede, The NetherlandsDepartment of Sleep and CognitionNetherlands Institute for Neuroscience, Meibergdreef 47, 1105BA Amsterdam, The NetherlandsNeuroscience Campus AmsterdamDepartments of Integrative Neurophysiology and Medical Psychology, VU University and Medical Center, De Boelelaan 1117, 1081HZ Amsterdam, The Netherlands
| | - E J W van Someren
- Center for Endocrine Tumors LeidenDepartment of Endocrinology and MetabolismDepartment of NeurologyLeiden University Medical Center, Albinusdreef 2, 2333ZA Leiden, The NetherlandsStichting Epilepsie Instellingen Nederland (SEIN)Achterweg 5, 2103SW Heemstede, The NetherlandsDepartment of Sleep and CognitionNetherlands Institute for Neuroscience, Meibergdreef 47, 1105BA Amsterdam, The NetherlandsNeuroscience Campus AmsterdamDepartments of Integrative Neurophysiology and Medical Psychology, VU University and Medical Center, De Boelelaan 1117, 1081HZ Amsterdam, The NetherlandsCenter for Endocrine Tumors LeidenDepartment of Endocrinology and MetabolismDepartment of NeurologyLeiden University Medical Center, Albinusdreef 2, 2333ZA Leiden, The NetherlandsStichting Epilepsie Instellingen Nederland (SEIN)Achterweg 5, 2103SW Heemstede, The NetherlandsDepartment of Sleep and CognitionNetherlands Institute for Neuroscience, Meibergdreef 47, 1105BA Amsterdam, The NetherlandsNeuroscience Campus AmsterdamDepartments of Integrative Neurophysiology and Medical Psychology, VU University and Medical Center, De Boelelaan 1117, 1081HZ Amsterdam, The Netherlands
| | - J A Romijn
- Center for Endocrine Tumors LeidenDepartment of Endocrinology and MetabolismDepartment of NeurologyLeiden University Medical Center, Albinusdreef 2, 2333ZA Leiden, The NetherlandsStichting Epilepsie Instellingen Nederland (SEIN)Achterweg 5, 2103SW Heemstede, The NetherlandsDepartment of Sleep and CognitionNetherlands Institute for Neuroscience, Meibergdreef 47, 1105BA Amsterdam, The NetherlandsNeuroscience Campus AmsterdamDepartments of Integrative Neurophysiology and Medical Psychology, VU University and Medical Center, De Boelelaan 1117, 1081HZ Amsterdam, The Netherlands
| | - N R Biermasz
- Center for Endocrine Tumors LeidenDepartment of Endocrinology and MetabolismDepartment of NeurologyLeiden University Medical Center, Albinusdreef 2, 2333ZA Leiden, The NetherlandsStichting Epilepsie Instellingen Nederland (SEIN)Achterweg 5, 2103SW Heemstede, The NetherlandsDepartment of Sleep and CognitionNetherlands Institute for Neuroscience, Meibergdreef 47, 1105BA Amsterdam, The NetherlandsNeuroscience Campus AmsterdamDepartments of Integrative Neurophysiology and Medical Psychology, VU University and Medical Center, De Boelelaan 1117, 1081HZ Amsterdam, The Netherlands
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18
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Maduro MR. The role of fibroblast growth factor 21 in controlling reproduction during nutritional deprivation. Reprod Sci 2013; 20:1405. [PMID: 24350351 DOI: 10.1177/1933719113510136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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19
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Maemura K. [Circadian rhythm and ischemic heart disease]. Nihon Rinsho 2013; 71:2124-2129. [PMID: 24437266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Cardiovascular function exhibits circadian oscillation. Furthermore, the onset time and severity of cardiovascular diseases exhibit diurnal variation. The internal circadian clock whose center exists in the suprachiasmatic nucleus regulates this circadian variation. Many studies have reported that night shift workers have high risk of ischemic heart disease, suggesting a close association between cardiovascular diseases and circadian rhythm. In addition, recent studies obtained from genetically engineered mice with disrupted circadian rhythm have revealed that the circadian clock is closely related to the pathogenesis of cardiovascular diseases. Understanding the importance of circadian rhythm in the cardiovascular diseases will provide a novel chronotherapeutic approaches to the prevention and treatment.
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Affiliation(s)
- Koji Maemura
- Department of Cardiovascular Medicine, Nagasaki University Graduate School of Biomedical Sciences
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20
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Abstract
PURPOSE This article reviews the recent advances in understanding of the fundamental properties of circadian rhythms and discusses the clinical features, diagnosis, and treatment of circadian rhythm sleep disorders (CRSDs). RECENT FINDINGS Recent evidence strongly points to the ubiquitous influence of circadian timing in nearly all physiologic functions. Thus, in addition to the prominent sleep and wake disturbances, circadian rhythm disorders are associated with cognitive impairment, mood disturbances, and increased risk of cardiometabolic disorders. The recent availability of biomarkers of circadian timing in clinical practice has improved our ability to identify and treat these CRSDs. SUMMARY Circadian rhythms are endogenous rhythms with a periodicity of approximately 24 hours. These rhythms are synchronized to the physical environment by social and work schedules by various photic and nonphotic stimuli. CRSDs result from a misalignment between the timing of the circadian rhythm and the external environment (eg, jet lag and shift work) or a dysfunction of the circadian clock or its afferent and efferent pathways (eg, delayed sleep-phase, advanced sleep-phase, non-24-hour, and irregular sleep-wake rhythm disorders). The most common symptoms of these disorders are difficulties with sleep onset and/or sleep maintenance and excessive sleepiness that are associated with impaired social and occupational functioning. Effective treatment for most of the CRSDs requires a multimodal approach to accelerate circadian realignment with timed exposure to light, avoidance of bright light at inappropriate times, and adherence to scheduled sleep and wake times. In addition, pharmacologic agents are recommended for some of the CRSDs. For delayed sleep-phase, non-24-hour, and shift work disorders, timed low-dose melatonin can help advance or entrain circadian rhythms; and for shift work disorder, wake-enhancing agents such as caffeine, modafinil, and armodafinil are options for the management of excessive sleepiness.
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Affiliation(s)
- Phyllis C Zee
- Northwestern University, 710 North Lake Shore Dr, Chicago, IL 60611, USA.
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21
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Takasu NN, Kurosawa G, Tokuda IT, Mochizuki A, Todo T, Nakamura W. Circadian regulation of food-anticipatory activity in molecular clock-deficient mice. PLoS One 2012; 7:e48892. [PMID: 23145013 PMCID: PMC3492221 DOI: 10.1371/journal.pone.0048892] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Accepted: 10/03/2012] [Indexed: 12/13/2022] Open
Abstract
In the mammalian brain, the suprachiasmatic nucleus (SCN) of the anterior hypothalamus is considered to be the principal circadian pacemaker, keeping the rhythm of most physiological and behavioral processes on the basis of light/dark cycles. Because restriction of food availability to a certain time of day elicits anticipatory behavior even after ablation of the SCN, such behavior has been assumed to be under the control of another circadian oscillator. According to recent studies, however, mutant mice lacking circadian clock function exhibit normal food-anticipatory activity (FAA), a daily increase in locomotor activity preceding periodic feeding, suggesting that FAA is independent of the known circadian oscillator. To investigate the molecular basis of FAA, we examined oscillatory properties in mice lacking molecular clock components. Mice with SCN lesions or with mutant circadian periods were exposed to restricted feeding schedules at periods within and outside circadian range. Periodic feeding led to the entrainment of FAA rhythms only within a limited circadian range. Cry1(-/-) mice, which are known to be a "short-period mutant," entrained to a shorter period of feeding cycles than did Cry2(-/-) mice. This result indicated that the intrinsic periods of FAA rhythms are also affected by Cry deficiency. Bmal1(-/-) mice, deficient in another essential element of the molecular clock machinery, exhibited a pre-feeding increase of activity far from circadian range, indicating a deficit in circadian oscillation. We propose that mice possess a food-entrainable pacemaker outside the SCN in which canonical clock genes such as Cry1, Cry2 and Bmal1 play essential roles in regulating FAA in a circadian oscillatory manner.
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Affiliation(s)
- Nana N. Takasu
- Laboratory of Oral Chronobiology, Graduate School of Dentistry, Osaka University, Osaka, Japan
| | - Gen Kurosawa
- Theoretical Biology Laboratory, RIKEN Advanced Science Institute, Wako, Japan
| | - Isao T. Tokuda
- Department of Micro System Technology, Ritsumeikan University, Shiga, Japan
| | - Atsushi Mochizuki
- Theoretical Biology Laboratory, RIKEN Advanced Science Institute, Wako, Japan
| | - Takeshi Todo
- Department of Radiation Biology and Medical Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Wataru Nakamura
- Laboratory of Oral Chronobiology, Graduate School of Dentistry, Osaka University, Osaka, Japan
- Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, Kawaguchi, Japan
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Cheng B, Anea CB, Yao L, Chen F, Patel V, Merloiu A, Pati P, Caldwell RW, Fulton DJ, Rudic RD. Tissue-intrinsic dysfunction of circadian clock confers transplant arteriosclerosis. Proc Natl Acad Sci U S A 2011; 108:17147-52. [PMID: 21969583 PMCID: PMC3193243 DOI: 10.1073/pnas.1112998108] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The suprachiasmatic nucleus of the brain is the circadian center, relaying rhythmic environmental and behavioral information to peripheral tissues to control circadian physiology. As such, central clock dysfunction can alter systemic homeostasis to consequently impair peripheral physiology in a manner that is secondary to circadian malfunction. To determine the impact of circadian clock function in organ transplantation and dissect the influence of intrinsic tissue clocks versus extrinsic clocks, we implemented a blood vessel grafting approach to surgically assemble a chimeric mouse that was part wild-type (WT) and part circadian clock mutant. Arterial isografts from donor WT mice that had been anastamosed to common carotid arteries of recipient WT mice (WT:WT) exhibited no pathology in this syngeneic transplant strategy. Similarly, when WT grafts were anastamosed to mice with disrupted circadian clocks, the structural features of the WT grafts immersed in the milieu of circadian malfunction were normal and absent of lesions, comparable to WT:WT grafts. In contrast, aortic grafts from Bmal1 knockout (KO) or Period-2,3 double-KO mice transplanted into littermate control WT mice developed robust arteriosclerotic disease. These lesions observed in donor grafts of Bmal1-KO were associated with up-regulation in T-cell receptors, macrophages, and infiltrating cells in the vascular grafts, but were independent of hemodynamics and B and T cell-mediated immunity. These data demonstrate the significance of intrinsic tissue clocks as an autonomous influence in experimental models of arteriosclerotic disease, which may have implications with regard to the influence of circadian clock function in organ transplantation.
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Affiliation(s)
- Bo Cheng
- Department of Pharmacology and Toxicology
- Department of Stomatology, Wuhan Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, China
| | | | - Lin Yao
- Department of Pharmacology and Toxicology
| | | | - Vijay Patel
- Cardiothoracic and Vascular Surgery, Georgia Health Sciences University, Augusta, GA 30912; and
| | | | | | | | - David J. Fulton
- Department of Pharmacology and Toxicology
- Vascular Biology Center, and
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Abstract
It is well known that melatonin participates in the regulation of many important physiological functions such as sleep-wakefulness cycle, motor coordination and neural plasticity, and cognition. However, as there are contradictory results regarding the melatonin production diurnal profile under alcohol consumption, the aim of this paper was to study the phenomenology and mechanisms of the putative modifications on the daily profile of melatonin production in rats submitted to chronic alcohol intake. The present results show that rats receiving 10% ethanol in drinking water for 35 days display an altered daily profile of melatonin production, with a phase delay and a reduction in the nocturnal peak. This can be partially explained by a loss of the daily rhythm and the 25% reduction in tryptophan hydroxylase activity and, mainly, by a phase delay in arylalkylamine N-acetyltransferase gene expression and a 70% reduction in its peak activity. Upstream in the melatonin synthesis pathway, the results showed that noradrenergic signaling is impaired as well, with a decrease in β1 and α1 adrenergic receptors' mRNA contents and in vitro sustained loss of noradrenergic-stimulated melatonin production by glands from alcohol-treated rats. Together, these results confirm the alterations in the daily melatonin profile of alcoholic rats and suggest the possible mechanisms for the observed melatonin synthesis modification.
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Affiliation(s)
- Rafael Peres
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, Brazil
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24
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Borgers AJ, Romeijn N, van Someren E, Fliers E, Alkemade A, Bisschop PH. Compression of the optic chiasm is associated with permanent shorter sleep duration in patients with pituitary insufficiency. Clin Endocrinol (Oxf) 2011; 75:347-53. [PMID: 21521321 DOI: 10.1111/j.1365-2265.2011.04053.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Patients with pituitary insufficiency often experience some degree of impaired sleep. Sleep-wake rhythm is regulated to a large extent by the suprachiasmatic nucleus (SCN). Because the SCN is located just superior to the optic chiasm, we hypothesized that a history of compression of the optic chiasm (CC) due to a tumour with suprasellar extension is associated with altered sleep patterns in patients with pituitary insufficiency. DESIGN Case-control study. PATIENTS We studied 38 patients (mean age 55·7 ± 13·1 years; 71·1% men) with CC and 18 patients (mean age 53·3 ± 16·6 years, 38·9% men) without CC. MEASUREMENTS Objective measures of sleep patterns were assessed by wrist actigraphy. Validated sleep questionnaires were used to evaluate subjective sleep parameters. RESULTS Objective total sleep duration was 36 min shorter in patients with CC than in patients without CC [454 (295-553) vs 490 (432-740) min, P = 0·034]. Moreover, patients with CC had a later habitual bedtime [23:15 (22:30-03:00) vs 22:55 (20:00-02:00) h, P = 0·044] and a later actigraphic sleep onset [23:57 (22:31-01:33) vs 23·16 (19:47-03:04) h, P = 0·020]. Linear regression analysis confirmed the difference in total sleep duration after adjustment for age, sex, body mass index, cranial radiotherapy and pituitary/hypothalamic surgery. Subjective sleep parameters were similar in both groups. CONCLUSIONS Compression of the optic chiasm due to a tumour with suprasellar extension is associated with permanent changes in total sleep duration in patients with pituitary insufficiency.
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Affiliation(s)
- Anke J Borgers
- Department of Endocrinology and Metabolism, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands.
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25
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Thorn L, Evans P, Cannon A, Hucklebridge F, Clow A. Seasonal differences in the diurnal pattern of cortisol secretion in healthy participants and those with self-assessed seasonal affective disorder. Psychoneuroendocrinology 2011; 36:816-23. [PMID: 21145663 DOI: 10.1016/j.psyneuen.2010.11.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2010] [Revised: 10/05/2010] [Accepted: 11/04/2010] [Indexed: 11/20/2022]
Abstract
This study compared the daily pattern of free salivary cortisol secretion in winter and in summer between two groups; participants with self-assessed seasonal affective disorder (SAD) and age- and sex-matched healthy controls. Fifty-two participants completed the study with an equal number in each group. The diurnal pattern of cortisol secretion was assessed across two consecutive weekdays in summer, and two in winter, with conditions being counterbalanced. On each study day participants collected multiple saliva samples in the domestic setting to capture the cortisol awakening response (CAR) and declining levels across the day. In addition, perceived stress, anxiety, depression, state stress and state arousal were assessed using validated questionnaires. There was no evidence for any seasonal changes in psychological data or cortisol pattern for the healthy control population. In summer, self-assessed SAD and control participants had similar psychological and cortisol profiles. In winter however, SAD participants reported greater depression, stress and anxiety, and lower levels of arousal. Furthermore, the CAR was significantly attenuated in SAD participants during winter months. There was no difference in cortisol levels during the rest of the day between controls and SAD participants in winter. In line with the above findings and previous research, there was an inverse relationship between the increase in cortisol following awakening and a measure of seasonality in winter. Furthermore in winter, a general dysphoria construct correlated inversely with the CAR, indicating that participants reporting greater depression, stress and anxiety and lower arousal, exhibited lower CARs. In conclusion, during the shortened photoperiod in winter, the cortisol response to awakening is attenuated in participants with self-assessed SAD in comparison to controls. These findings contribute to the understanding of the physiology of SAD.
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Affiliation(s)
- Lisa Thorn
- Department of Psychology, University of Westminster, London, UK.
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26
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Williams RH, Morton AJ, Burdakov D. Paradoxical function of orexin/hypocretin circuits in a mouse model of Huntington's disease. Neurobiol Dis 2011; 42:438-45. [PMID: 21324360 PMCID: PMC5767114 DOI: 10.1016/j.nbd.2011.02.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Revised: 02/04/2011] [Accepted: 02/07/2011] [Indexed: 10/18/2022] Open
Abstract
Huntington's disease (HD) is a neurodegenerative disorder involving progressive motor disturbances, cognitive decline, and desynchronized sleep-wake rhythms. Recent studies revealed that restoring normal sleep-wake cycles can improve cognitive function in HD mice, suggesting that some sleep/wake systems remain operational and thus represent potential therapeutic targets for HD. Hypothalamic neurons expressing orexins/hypocretins (orexin neurons) are fundamental orchestrators of arousal in mammals, but it is unclear whether orexin circuits operate normally in HD. Here we analyzed the electrophysiology, histology, and gene expression of orexin circuits in brain slices from R6/2 mice, a transgenic model of HD with a progressive neurological phenotype. We report that in R6/2 mice, the size of an electrically distinct subpopulation of orexin neurons is reduced, as is the number of orexin-immunopositive cells in some hypothalamic regions. R6/2 orexin cells display altered glutamatergic inputs, and have an abnormal circadian profile of activity, despite normal circadian rhythmicity of the suprachiasmatic nucleus (SCN), the "master clock" of the brain. Nevertheless, even at advanced stages of HD, intrinsic firing properties of orexin cells remain normal and suppressible by serotonin, noradrenaline, and glucose. Furthermore, histaminergic neurons (key cells required for the propagation of orexin-induced arousal) also display normal responses to orexin. Together, these data suggest that the orexin system remains functional and modifiable in HD mice, although its circadian activity profile is disrupted and no longer follows that of the SCN.
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Affiliation(s)
- Rhîannan H. Williams
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge CB2 1PD, UK
| | - A. Jennifer Morton
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge CB2 1PD, UK
| | - Denis Burdakov
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge CB2 1PD, UK
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27
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Jakovljević M. Agomelatine as chronopsychopharmaceutics restoring circadian rhythms and enhancing resilience to stress: a wishfull thinking or an innovative strategy for superior management of depression? Psychiatr Danub 2011; 23:2-9. [PMID: 21448091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
BACKGROUND While the research and treatment focus of biological aspects of depression has traditionally centered on neutrotransmitters disturbances, there has been relatively little attention paid to the chronobiological aspects of depression that offer rapid acting chronotherapeutis and from recently also an innovative circadian rhythms resynchronizing antidepressant. OBJECTIVE This article discusses chronobiological aspects of psychiatric treatment, particularly related to depression. It is concerned with chronotherapeutics and pharmacological interventions to resychronize circadian rhythms, particularly focused on agomelatine, an innovative antidepressant targeting melatonergic M1/M2 and serotonergic 5-HT2c receptors. DISCUSSION Depression can be explained as dysfunction at the nexus of the body, brain and mind, three mutually very dependent components, associated through circadian pace makers at the molecular, cellular, physiological and behavioral levels. Mental disorders, particularly depression, are common in people with circadian rest-activity cycle disturbances and sleep-wake problems. The circadian rest-activity and sleep-wake cycle disturbances are risk factors for developing and recurrence of mental disorders as well as, what is very important, they are associated with worse outcome. The interrelationships between circadian rhythm disturbances and depression is very complex, and the fundamental question is whether they trigger depression or whether these disturbances arise as a consequence of the disease. However, both depression and circadian rhythm disturbances may have a common aetiology: a decreased cellurar resilience associated with lower resistance to stressful events. Treating depression pharmacologicaly through the restoration of circadian rhythms may open a new era of superior management of depression and other mental disorders. CONCLUSION Chronotherapeutic strategies that reset the internal clock may have specific advantage for the treatment of depression and other mental disorders. There is still a lot of research to be done on utilising chronotherapeutic principles in clinical practice, particularly regarding the specific indications. Agomelatine seems to be an promising resynchronizing agent expanding the field of chronopharmacology and inducing new treatment strategy.
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MESH Headings
- Acetamides/adverse effects
- Acetamides/therapeutic use
- Antidepressive Agents/adverse effects
- Antidepressive Agents/therapeutic use
- Circadian Rhythm/drug effects
- Depressive Disorder, Major/drug therapy
- Depressive Disorder, Major/physiopathology
- Depressive Disorder, Major/psychology
- Humans
- Hypnotics and Sedatives/adverse effects
- Hypnotics and Sedatives/therapeutic use
- Mind-Body Relations, Metaphysical
- Resilience, Psychological/drug effects
- Sleep Disorders, Circadian Rhythm/drug therapy
- Sleep Disorders, Circadian Rhythm/physiopathology
- Sleep Disorders, Circadian Rhythm/psychology
- Stress, Psychological/complications
- Stress, Psychological/physiopathology
- Stress, Psychological/psychology
- Suprachiasmatic Nucleus/drug effects
- Suprachiasmatic Nucleus/physiopathology
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Affiliation(s)
- Miro Jakovljević
- Department of Psychiatry, University Hospital Centre Zagreb, Kišpatićeva 12, 10000 Zagreb, Croatia.
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28
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Arushanian EB. [Chronobiology of depression: a role of suprachiasmatic nuclei of the hypothalamus and clock genes]. Zh Nevrol Psikhiatr Im S S Korsakova 2011; 111:96-103. [PMID: 21905335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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29
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Turner PL, Van Someren EJW, Mainster MA. The role of environmental light in sleep and health: Effects of ocular aging and cataract surgery. Sleep Med Rev 2010; 14:269-80. [PMID: 20056462 DOI: 10.1016/j.smrv.2009.11.002] [Citation(s) in RCA: 125] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2009] [Revised: 11/06/2009] [Accepted: 11/06/2009] [Indexed: 11/29/2022]
Affiliation(s)
- Patricia L Turner
- Department of Ophthalmology, University of Kansas School of Medicine, 7400 State Line Road, Prairie Village, KS 66208-3444, USA.
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30
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Abstract
The physiological effects of vasopressin as a peripheral hormone were first reported more than 100 years ago. However, it was not until the first immunocytochemical studies were carried out in the early 1970s, using vasopressin antibodies, and the discovery of an extensive distribution of vasopressin-containing fibres outside the hypothalamus, that a neurotransmitter role for vasopressin could be hypothesised. These studies revealed four additional vasopressin systems next to the classical magnocellular vasopressin system in the paraventricular and supraoptic nuclei: a sexually dimorphic system originating from the bed nucleus of the stria terminalis and the medial amygdala, an autonomic and endocrine system originating from the medial part of the paraventricular nucleus, and the circadian system originating from the hypothalamic suprachiasmatic nuclei (SCN). At about the same time as the discovery of the neurotransmitter function of vasopressin, it also became clear that the SCN contain the main component of the mammalian biological clock system (i.e. the endogenous pacemaker). This review will concentrate on the significance of the vasopressin neurones in the SCN for the functional output of the biological clock that is contained within it. The vasopressin-containing subpopulation is a characteristic feature of the SCN in many species, including humans. The activity of the vasopressin neurones in the SCN shows a pronounced daily variation in its activity that has also been demonstrated in human post-mortem brains. Animal experiments show an important role for SCN-derived vasopressin in the control of neuroendocrine day/night rhythms such as that of the hypothalamic-pituitary-adrenal and hypothalamic-pituitary-gonadal axes. The remarkable correlation between a diminished presence of vasopressin in the SCN and a deterioration of sleep-wake rhythms during ageing and depression make it likely that, also in humans, the vasopressin neurones contribute considerably to the rhythmic output of the SCN.
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Affiliation(s)
- A Kalsbeek
- Department of Endocrinology and Metabolism, Academic Medical Center (AMC), University of Amsterdam, 1105 AZ Amsterdam, The Netherlands.
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31
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Kálmán J, Kálmán S. [Depression as chronobiological illness]. Neuropsychopharmacol Hung 2009; 11:69-81. [PMID: 19827314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Chronobiological problems are always present as aetiological or pathoplastic conditions almost in all psychiatric disorders and considered as the greatest contributors to the mood and sleep disorders associated problems. The present review summarise the recent advances in the chronobiology research from the point of the clinician with particular emphasis on the psychobiology and pharmacotherapy of the depression. Human behaviour builds up from different length of circadian, ultradian and seasonal rhytms, strictly controlled by a hierarchical organisation of sub-cellullar, cellular, neuro-humoral and neuro-immunological clock systems. These internal clock systems are orchestrated at molecular level by certain clock genes and on the other hand--at neuro-humoral level--by the effect of the sleep hormone, melatonine, produced by the neurons of the suprachiasmatic nucleus (SCN). Beside the biological factors, social interactions are also considered as important regulators of the biological clock systems. The pacemaker centers of the SCN receive efferents from the serotoninergic raphe nuclei in order to regulate stress responses and neuroimmunological functions. The direction and the level of the chronobiological desynchronisation could be totally divergent in the case of the different affective disorders. Different chronobiological interventions are required therefore in the case of the advanced and delayed sleep disorders. Sleeping disorders are considered as the most recognised signs of the chronobiological desynchronisation in depression, but these symptoms are only the tip of the iceberg, since other chronobiological symptoms could be present due to the hidden physiological abnormalities. The serum melatonine profile is considered to be characteristic to age, gender and certain neuropsychiatric disorders. The natural and synthetic agonist of the melatonine receptors could be used as chronobiotics. The recently marketed agomelatine with a highly selective receptor binding profile (MT1 and MT2 agonism and 5HT2C antagonism) targets the desynchronised circadian rhytm in affective disorders and it has mainly antidepressive effect. Among the non-pharmacological chronobiological interventions, the different forms of the sleep deprivation, light and social rhytm therapies could offer alternative treatment options for the clinician.
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32
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Abstract
In recent decades our knowledge of the molecular mechanisms of biological clocks has grown expontentially. This has helped to guide the choice of genes studied to explain inter-individual variations seen in circadian rhythms. In recent years analysis of circadian rhythms has advanced considerably into the study of pathological circadian rhythms in human beings. These findings, combined with those obtained from studying mice whose circadian genes have been rendered incapable, have revealed the role of genetic factors in circadian rhythms. This literature review presents an overview of these findings. Beyond our understanding of the functioning of these biological clocks, this knowledge will be extremely useful to analyse genetic factors involved in morbid conditions involving circadian rhythm abnormalities.
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Affiliation(s)
- F Bellivier
- Pôle de Psychiatrie, CHU de Créteil, Hôpital Henri Mondor, Université Paris 12.
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33
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Handa RJ, Zoeller RT, McGivern RF. Changes in vasoactive intestinal peptide and arginine vasopressin expression in the suprachiasmatic nucleus of the rat brain following footshock stress. Neurosci Lett 2007; 425:99-104. [PMID: 17826907 PMCID: PMC2048536 DOI: 10.1016/j.neulet.2007.08.044] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2007] [Revised: 08/17/2007] [Accepted: 08/21/2007] [Indexed: 10/22/2022]
Abstract
The neuropeptides, arginine vasopressin (AVP) and vasoactive intestinal polypeptide (VIP) are synthesized by neurons of the suprachiasmatic nucleus (SCN) of the hypothalamus and are important regulators of SCN function. Previous studies have demonstrated that acute exposure to stressors can disrupt circadian activity rhythms, suggesting the possibility of stress-related alterations in the expression of these neuropeptides within SCN neurons. In this study, we examined the effect of intermittent footshock stress on AVP mRNA and heterogeneous nuclear RNA (hnRNA) and VIP mRNA expression in neurons of the SCN. Young adult male Sprague/Dawley rats were subjected to 15 s of scrambled intermittent footshock (0.50 mA pulses, 1 pulse/s, 300 ms duration) every 5 min for 30 min. Animals were sacrificed 75 or 135 min after the onset of stress and brains examined for AVP mRNA and hnRNA, and VIP mRNA using in situ hybridization. Footshock stress increased AVP hnRNA levels at the 75 min time point whereas AVP mRNA was elevated at both the 75 and 135 min time points. In contrast, footshock stress decreased the number of cells expressing VIP mRNA in the SCN without changing hybridization level per cell. These data indicate that the disruptive effect of stress on activity rhythms correlate with alterations in the expression of regulatory peptides within the SCN.
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Affiliation(s)
- Robert J Handa
- Department of Biomedical Sciences/Neuroscience Division, College of Veterinary Medicine, Colorado State University, Fort Collins, CO 80523, USA.
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34
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Abstract
STUDY OBJECTIVES In mammals, sleep is controlled by a homeostatic process, which regulates depth of sleep, and by the circadian clock of the suprachiasmatic nucleus (SCN), which regulates 24-h rhythms in timing of sleep. Sleep deprivation is known to cause molecular and physiological changes and results in an alteration in the timing of sleep. It is generally assumed that following sleep deprivation, homeostatic mechanisms overrule the circadian clock, allowing animals to sleep during their active phase. However, recent evidence indicates that sleep states have direct access to the circadian pacemaker of the SCN. We questioned therefore whether sleep deprivation may have long-term effects on the circadian pacemaker, which may explain altered sleep patterns following sleep deprivation. DESIGN To test this hypothesis, we combined SCN recordings of electrical impulse frequency through stationary implanted electrodes in freely moving rats with electroencephalogram recordings in the same animal before, during, and after a mild 6-h sleep deprivation. MEASUREMENTS AND RESULTS Following sleep deprivation, SCN neuronal activity was significantly reduced to about 60% of baseline levels. The decrements in SCN activity were most obvious during NREM sleep and REM sleep and lasted for 6-7 hours. CONCLUSIONS The data show that sleep deprivation influences not only sleep homeostatic mechanisms, but also SCN electrical activity, resulting in a strong reduction in circadian amplitude in the major output signal from the SCN.
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Affiliation(s)
- Tom Deboer
- Laboratory for Neurophysiology, Department of Molecular Cell Biology, Leiden University Medical Center Leiden, The Netherlands.
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35
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Abstract
The study aimed to investigate the effect of oxytocin on antinociception in the rat. The pain threshold was elevated by oxytocin following intraventricular (icv) or intrathecal injection (ith), and reduced by anti-oxytocin serum (icv or ith). But the pain threshold was not altered by intravenous injection (iv) of oxytocin or anti-oxytocin serum. Pain stimulation induced oxytocin concentration decrease in the hypothalamic supraoptic nucleus, and increase in the locus coeruleus, raphe magnus nucleus, caudate nucleus and spinal cord, but no change in the hypothalamic paraventricular nucleus and plasma. The results indicated that central, not peripheral oxytocin could enhance antinociception.
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Affiliation(s)
- Jun Yang
- Institute for Pharmaceuticals and Medical Science, Guangdong Bangmin Pharmaceutical Co. Ltd., Jianghai Distract, Jiangmen, Guangdong 529080, China.
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36
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Wu YH, Swaab DF. Disturbance and strategies for reactivation of the circadian rhythm system in aging and Alzheimer's disease. Sleep Med 2007; 8:623-36. [PMID: 17383938 DOI: 10.1016/j.sleep.2006.11.010] [Citation(s) in RCA: 182] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2006] [Revised: 11/09/2006] [Accepted: 11/11/2006] [Indexed: 12/15/2022]
Abstract
Circadian rhythm disturbances, such as sleep disorders, are frequently seen in aging and are even more pronounced in Alzheimer's disease (AD). Alterations in the biological clock, the suprachiasmatic nucleus (SCN), and the pineal gland during aging and AD are considered to be the biological basis for these circadian rhythm disturbances. Recently, our group found that pineal melatonin secretion and pineal clock gene oscillation were disrupted in AD patients, and surprisingly even in non-demented controls with the earliest signs of AD neuropathology (neuropathological Braak stages I-II), in contrast to non-demented controls without AD neuropathology. Furthermore, a functional disruption of the SCN was observed from the earliest AD stages onwards, as shown by decreased vasopressin mRNA, a clock-controlled major output of the SCN. The observed functional disconnection between the SCN and the pineal from the earliest AD stage onwards seems to account for the pineal clock gene and melatonin changes and underlies circadian rhythm disturbances in AD. This paper further discusses potential therapeutic strategies for reactivation of the circadian timing system, including melatonin and bright light therapy. As the presence of melatonin MT1 receptor in the SCN is extremely decreased in late AD patients, supplementary melatonin in the late AD stages may not lead to clear effects on circadian rhythm disorders.
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Affiliation(s)
- Ying-Hui Wu
- Netherlands Institute for Neuroscience, Meibergdreef 47, 1105 BA Amsterdam, The Netherlands
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37
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Hu WP, Li JD, Zhang C, Boehmer L, Siegel JM, Zhou QY. Altered circadian and homeostatic sleep regulation in prokineticin 2-deficient mice. Sleep 2007; 30:247-56. [PMID: 17425220 PMCID: PMC2673012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2023] Open
Abstract
STUDY OBJECTIVES Sleep is regulated by circadian and homeostatic processes. Recent studies with mutant mice have indicated that circadian-related genes regulate sleep amount, as well as the timing of sleep. Thus a direct link between circadian and homeostatic regulation of sleep may exist, at least at the molecular level. Prokineticin 2 (PK2), which oscillates daily with high amplitude in the suprachiasmatic nuclei (SCN), has been postulated to be an SCN output molecule. In particular, mice lacking the PK2 gene (PK2-/-) have been shown to display significantly reduced rhythmicity for a variety of circadian physiological and behavioral parameters. We investigated the role of PK2 in sleep regulation. DESIGN EEG/EMG sleep-wake patterns were recorded in PK2-/- mice and their wild-type littermate controls under baseline and challenged conditions. MEASUREMENTS AND RESULTS PK2-/- mice exhibited reduced total sleep time under entrained light-dark and constant darkness conditions. The reduced sleep time in PK2-/- mice occurred predominantly during the light period and was entirely due to a decrease in non-rapid eye movement (NREM) sleep time. However, PK2-/- mice showed increased rapid eye movement (REM) sleep time in both light and dark periods. After sleep deprivation, compensatory rebound in NREM sleep, REM sleep, and EEG delta power was attenuated in PK2-/- mice. In addition, PK2-/- mice had an impaired response to sleep disturbance caused by cage change in the light phase. CONCLUSIONS These results indicate that PK2 plays roles in both circadian and homeostatic regulation of sleep. PK2 may also be involved in maintaining the awake state in the presence of behavioral challenges.
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Affiliation(s)
- Wang-Ping Hu
- Department of Pharmacology, University of California, Irvine, CA
| | - Jia-Da Li
- Department of Pharmacology, University of California, Irvine, CA
| | - Chengkang Zhang
- Department of Pharmacology, University of California, Irvine, CA
| | - Lisa Boehmer
- Neurobiology Research 151A3, VA GLAHS Sepulveda, Department of Psychiatry and Brain Research Institute, UCLA School of Medicine, North Hills, CA
| | - Jerome M. Siegel
- Neurobiology Research 151A3, VA GLAHS Sepulveda, Department of Psychiatry and Brain Research Institute, UCLA School of Medicine, North Hills, CA
| | - Qun-Yong Zhou
- Department of Pharmacology, University of California, Irvine, CA
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38
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Sadki A, Bentivoglio M, Kristensson K, Nygård M. Suppressors, receptors and effects of cytokines on the aging mouse biological clock. Neurobiol Aging 2007; 28:296-305. [PMID: 16426706 DOI: 10.1016/j.neurobiolaging.2005.12.007] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2005] [Revised: 11/13/2005] [Accepted: 12/12/2005] [Indexed: 11/28/2022]
Abstract
During aging, levels of inflammatory cytokines increase and circadian rhythms are frequently altered. We here investigated neurobiological correlates of neuroinflammation and its age-related variation in the hypothalamic suprachiasmatic nucleus (SCN), the master circadian pacemaker. Day/night variations of transcripts encoding cytokine receptors and suppressors of cytokine signaling (SOCS) were correlated in groups of mice of different ages with Fos induction elicited by intracerebroventricular injections of tumor necrosis factor-alpha and interferon-gamma. Cytokine-elicited Fos induction was high at early night, when SOCS1 and SOCS3 levels were low. Such Fos induction was significantly reduced in the older SCN at early night, and paralleled by reduced expression of interferon-gamma receptor transcripts as compared to the younger SCN. In addition, Fos induction at early night exhibited marked sub-regional differences in the SCN between the age groups. The study shows that SOCS1 and SOCS3 are expressed in the biological clock with a day/night variation that may regulate SCN responsiveness to cytokine exposure, and indicates that effects of pro-inflammatory cytokines on the SCN are markedly altered during senescence.
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Affiliation(s)
- Adil Sadki
- Department of Morphological and Biomedical Sciences, University of Verona, Italy
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39
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Abstract
Humans exhibit endogenous circadian rhythms that are regulated by the master circadian clock of the body, the suprachiasmatic nucleus. These endogenous circadian rhythms are aligned to the outside world by social and environmental cues. Circadian rhythm sleep disorders (CRSD) occur when there is an alteration of the internal timing mechanism or a misalignment between sleep and the 24-h social and physical environment. CRSD are often underrecognized yet should be considered in the differential of patients presenting with symptoms of insomnia and/or hypersomnia. Because behavioral and environmental factors often are involved in the development and maintenance of these conditions, a multimodal treatment approach of behavioral and/or pharmacologic approaches is usually required to synchronize a patient's circadian rhythm to the 24-h environment, consolidate sleep, and improve alertness. Rapid advances in our understanding of the physiologic, cellular, and molecular basis of circadian rhythm and sleep regulation will likely lead to improved diagnostic tools and treatments for CRSD.
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Affiliation(s)
- Brandon S Lu
- Feinberg School of Medicine, Northwestern University, 710 North Lake Shore Drive, Chicago, IL 60611, USA
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40
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Abstract
Nearly all patients with bipolar disorder have severely disrupted circadian rhythms. Treatment with mood stabilizers can restore these daily rhythms, and this is correlated with patient recovery. However, it is still uncertain whether clock abnormalities are the cause of bipolar disorder or if these rhythm disruptions are secondary to alterations in other circuits. Furthermore, the mechanism by which the circadian clock might influence mood is still unclear. With cloning and characterization of the circadian genes and recent advances in molecular biology, we are starting to understand this strong association between circadian rhythms and bipolar disorder. Recent human genetic and mouse behavioral studies indicate that the Clock gene is particularly relevant in the mood disruptions associated with this disorder. Furthermore, it appears that Clock expression outside of the central pacemaker of the suprachiasmatic nucleus (SCN) is involved in mood regulation. In this chapter, the evidence linking circadian rhythms, the Clock gene, and bipolar disorder is discussed, along with the possible biology that underlies this connection.
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Affiliation(s)
- C A McClung
- Department of Psychiatry , University of Texas Southwestern Medical Center, Dallas, Texas 75390-9070, USA
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41
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Lévi F, Filipski E, Iurisci I, Li XM, Innominato P. Cross-talks between circadian timing system and cell division cycle determine cancer biology and therapeutics. Cold Spring Harb Symp Quant Biol 2007; 72:465-75. [PMID: 18419306 DOI: 10.1101/sqb.2007.72.030] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The circadian clock orchestrates cellular functions over 24 hours, including cell divisions, a process that results from the cell cycle. The circadian clock and cell cycle interact at the level of genes, proteins, and biochemical signals. The disruption or the reinforcement of the host circadian timing system, respectively, accelerates or slows down cancer growth through modifications of host and tumor circadian clocks. Thus, cancer cells not only display mutations of cell cycle genes but also exhibit severe defects in clock gene expression levels or 24-hour patterns, which can in turn favor abnormal proliferation. Most of the experimental research actively ongoing in this field has been driven by the original demonstration that cancer patients with poor circadian rhythms had poor quality of life and poor survival outcome independently of known prognostic factors. Further basic research on the gender dependencies in circadian properties is now warranted, because a large clinical trial has revealed that gender can largely affect the survival outcome of cancer patients on chronotherapeutic delivery. Mathematical models further show that the therapeutic index of chemotherapeutic drugs can be optimized through distinct delivery profiles, depending on the initial host/tumor status and variability in circadian entrainment and/or cell cycle length. Clinical trials and systems-biology approaches in cancer chronotherapeutics raise novel issues to be addressed experimentally in the field of biological clocks. The challenge ahead is to therapeutically harness the circadian timing system to concurrently improve quality of life and down-regulate malignant growth.
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Affiliation(s)
- F Lévi
- INSERM, U776 Rythmes biologiques et cancers, Hôpital Paul Brousse, Villejuif, F-94807, France
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42
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Abstract
Long-term epidemiologic studies on large numbers of night and rotating shift workers have suggested an increase in the incidence of breast and colon cancer in these populations. These studies suffer from poor definition and quantification of the work schedules of the exposed subjects. Against this background, the pathophysiology of phase shift and phase adaptation is reviewed. A phase shift as experienced in night and rotating shift work involves desynchronization at the molecular level in the circadian oscillators in the central nervous tissue and in most peripheral tissues of the body. There is a change in the coordination between oscillators with transient loss of control by the master-oscillator (the Suprachiasmatic Nucleus, SCN) in the hypothalamus. The implications of the pathophysiology of phase shift are discussed for long-term health effects and for the design of ergonomic work schedules minimizing the adverse health effects upon the worker.
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Affiliation(s)
- Erhard Haus
- Department of Laboratory Medicine & Pathology, University of Minnesota, Health Partners Medical Group, Regions Hospital, St. Paul, Minnesota 55101, USA.
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43
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Affiliation(s)
- M Benoit
- Centre Mémoire de Ressources et de Recherche, Hôpital Pasteur, 30, Voie Romaine, 06002 Nice cedex 1
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44
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Claustrat B. Perturbations des rythmes circadiens au cours des affections neurologiques. Encephale 2006; 32:S813-7. [PMID: 17119477 DOI: 10.1016/s0013-7006(06)76236-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Affiliation(s)
- B Claustrat
- Service de Radioanalyse, Centre de Médecine Nucléaire, Groupement Hospitalier Est, 59, boulevard Pinel, 69677 Bron cedex
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45
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Frédéric F, Chianale C, Oliver C, Mariani J. Enhanced endocrine response to novel environment stress and lack of corticosterone circadian rhythm in staggerer (Rora sg/sg) mutant mice. J Neurosci Res 2006; 83:1525-32. [PMID: 16555296 DOI: 10.1002/jnr.20843] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The staggerer (Rora sg/sg) mutation is a deletion in the retinoid-related orphan receptor (RORalpha) gene that prevents translation of the ligand-binding domain (LBD), leading to the loss of RORalpha activity. RORalpha is a transcription factor that belongs to the nuclear receptor superfamily. In the brain, RORalpha is expressed in specific areas, including the cerebellum and suprachiasmatic nucleus (SCN). The homozygous Rora sg/sg mutant mouse, of which the most obvious phenotype is ataxia associated with cerebellar degeneration, also overproduces inflammatory cytokines. Here we compared the response to novelty stress of staggerer and wild-type mice as well as their diurnal cycles of adrenocorticotropic hormone and corticosterone secretion. We show that the staggerer mouse displays an enhanced endocrine response to novelty stress, which is not due to the enhanced production of interleukin-1 (IL-1), insofar as it is not blocked by pretreatment with IL-1ra and lacks the diurnal shift in corticosterone nonstressed levels; this last feature might be related to the expression of RORalpha in the SCN, a structure that maintains the circadian clock and plays a role in timing rhythmic physiology and behavior.
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Affiliation(s)
- Florence Frédéric
- Neurobiologie des Processus Adaptatifs, Equipe Développement et Vieillissement du Système Nerveux, Université Pierre et Marie Curie-Paris 6, UMR 7102-NPA, CNRS, Paris, France
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Radziuk J, Pye S. Diurnal rhythm in endogenous glucose production is a major contributor to fasting hyperglycaemia in type 2 diabetes. Suprachiasmatic deficit or limit cycle behaviour? Diabetologia 2006; 49:1619-28. [PMID: 16752180 DOI: 10.1007/s00125-006-0273-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2005] [Accepted: 02/18/2006] [Indexed: 10/24/2022]
Abstract
AIMS/HYPOTHESIS An increase in endogenous glucose production (EGP) is a major contributor to fasting morning hyperglycaemia in type 2 diabetes. This increase is dissipated with fasting, later in the day. To understand its origin, EGP, gluconeogenesis and hormones that regulate metabolism were measured over 24 h. We hypothesised that EGP, and therefore glycaemia, would demonstrate a centrally mediated circadian rhythm in type 2 diabetes. SUBJECTS AND METHODS Seven subjects with type 2 diabetes and six age- and BMI-matched control subjects, fasting after breakfast (08.00 h), underwent a further 24-h fast, with the infusion of [U-(13)C]glucose and [3-(14)C]lactate, starting at 14.00 h. The MCR and production of total and gluconeogenic glucose were determined from the tracer concentrations using compartmental analysis. RESULTS MCR was near constant: 1.73+/-0.10 in control and 1.40+/-0.14 ml kg(-1) min(-1) in diabetic subjects (p=0.04). EGP in diabetes rose gradually overnight from 8.2+/-0.7 to 11.3+/-0.5 micromol kg(-1) min(-1) at 06.00 h (p<0.05). Glucose utilisation lagged EGP, rising from 8.5+/-0.6 to 10.5+/-0.4 micromol kg(-1) min(-1) (p<0.05), inducing a fall in glycaemia from a peak of 8.0+/-0.5 mmol/l to 6.3+/-0.4 mmol/l (p<0.05). Cortisol and melatonin showed diurnal variations, whereas insulin, glucagon and leptin did not. Melatonin was most closely related to EGP, but its secretion was attenuated in diabetes (p<0.05). CONCLUSIONS/INTERPRETATION In type 2 diabetes, EGP and gluconeogenesis display diurnal rhythms that drive the fasting hyperglycaemia and are absent in healthy control subjects. The rise in EGP may be related to a deficit in suprachiasmatic nucleus activity in diabetes, or result from non-linear behaviour plus a transition from a normal steady state to a limit cycle pattern in diabetes, or both.
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Affiliation(s)
- J Radziuk
- Diabetes and Metabolism Research Unit, Ottawa Hospital (Civic Campus), 1053 Carling Avenue, Ottawa, ON, K1Y 4E9, Canada.
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Abstract
The accepted dogma in circadian biology is that the transcription factor CLOCK lies at the heart of the molecular clock that drives behavioral and molecular rhythms. In this issue of Neuron, the generation of CLOCK-deficient mice with only subtle clock defects by DeBruyne et al. shakes up this view of the mammalian clock.
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Affiliation(s)
- Ben Collins
- Biology Department, New York University, 100 Washington Square East, New York, New York 10003, USA
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Doljansky JT, Dagan Y. [A chronobiological approach in treatment of sleep disturbances in Alzheimer's dementia patients]. Harefuah 2006; 145:437-40, 470. [PMID: 16838900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Alzheimer's dementia (AD) is a neurodegenerative disease that is often accompanied by severe sleep disturbances. The manifestation of the sleep disturbances is twofold: nighttime hyperarousal sometimes accompanied by irritability and agitation, and daytime excessive sleepiness. Thus, although treatment with sedatives or hypnotics may offer some relief to the nighttime hyperarousal, the daytime excessive sleepiness remains mostly unresolved. Recently, however, more promising results in relief of excessive daytime sleepiness, as well as nighttime hyperarousal, are offered by the chronobiological approach. This approach attributes the sleep problems of AD patients to a dysfunction in a broader neuronal mechanism, namely the biological clock, that paces various physiological functions, among which is the sleep-wake cycle. The biological clock, situated in the suprachiasmatic nuclei (SCN) of the hypothalamus, receives environmental light input via neuronal signals from the retina. The SCN, in turn, innervates the pineal gland, that is responsible for the production and release of melatonin. Light stimulus causes the attenuation of melatonin secretion from the pineal gland; whereas the cessation of light increases melatonin secretion. In diurnal mammals, the dim light melatonin onset (DLMO) is in accordance with sleep onset. The chronobiological approach offers two main treatments to the sleep problems in AD patients: morning exposure to bright light and evening administration of melatonin, both of which show at least moderate success in restoring the sleep-wake cycle in AD patients, that is more marked in the early stages of the disease.
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Affiliation(s)
- Julia T Doljansky
- Institute for Sleep and Fatigue Medicine, the Chaim Sheba Medical Center, Tel Hashomer .
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49
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Abstract
UNLABELLED Altered circadian rhythms predicted for poor survival in patients with metastatic colorectal or breast cancer. An increased incidence of cancers has been reported in flying attendants and in women working predominantly at night. To explore the contribution of circadian structure to tumor growth we ablated the 24-h rest-activity cycle and markedly altered the rhythms in body temperature, serum corticosterone and lymphocyte count in mice by complete stereotaxic destruction of the suprachiasmatic nuclei (SCN) or by subjecting the mice to experimental chronic jet-lag. Such disruption of circadian coordination significantly accelerated malignant growth in two transplantable tumor models, Glasgow osteosarcoma and Pancreatic adenocarcinoma. The mRNA expression of clock genes per2 and reverb-alpha in controls displayed significant circadian rhythms in the liver (Cosinor, p=0.006 and p=0.003, respectively) and in the tumor (p=0.04 and p<0.001, respectively). Both rhythms were suppressed in the liver and in the tumor of jet lagged mice. This functional disturbance of molecular clock resulted in down regulation of p53 and overexpression of c-Myc, two effects which may favor cancer growth. CONCLUSIONS These results indicate that circadian system could play an important role in malignant growth control. This should be taken into consideration in cancer prevention and therapy.
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Affiliation(s)
- Elizabeth Filipski
- INSERM E 354 Cancer Chronotherapeutics, Hôpital Paul Brousse, Villejuif, France.
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50
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Abstract
Breast cancer risk is high in industrialized societies, and increases as developing countries become more Westernized. The reasons are poorly understood. One possibility is circadian disruption from aspects of modern life, in particular the increasing use of electric power to light the night, and provide a sun-free environment during the day inside buildings. Circadian disruption could lead to alterations in melatonin production and in changing the molecular time of the circadian clock in the suprachiasmatic nuclei (SCN). There is evidence in humans that the endogenous melatonin rhythm is stronger for persons in a bright-day environment than in a dim-day environment; and the light intensity necessary to suppress melatonin at night continues to decline as new experiments are done. Melatonin suppression can increase breast tumorigenesis in experimental animals, and altering the endogenous clock mechanism may have downstream effects on cell cycle regulatory genes pertinent to breast tissue development and susceptibility. Therefore, maintenance of a solar day-aligned circadian rhythm in endogenous melatonin and in clock gene expression by exposure to a bright day and a dark night, may be a worthy goal. However, exogenous administration of melatonin in an attempt to achieve this goal may have an untoward effect given that pharmacologic dosing with melatonin has been shown to phase shift humans depending on the time of day it's given. Exogenous melatonin may therefore contribute to circadian disruption rather than alleviate it.
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Affiliation(s)
- Richard G Stevens
- University of Connecticut Health Center, Farmington, CT 06030-6325, USA.
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