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Sueviriyapan N, Granados-Fuentes D, Simon T, Herzog ED, Henson MA. Modelling the functional roles of synaptic and extra-synaptic γ-aminobutyric acid receptor dynamics in circadian timekeeping. J R Soc Interface 2021; 18:20210454. [PMID: 34520693 PMCID: PMC8440032 DOI: 10.1098/rsif.2021.0454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 08/23/2021] [Indexed: 11/12/2022] Open
Abstract
In the suprachiasmatic nucleus (SCN), γ-aminobutyric acid (GABA) is a primary neurotransmitter. GABA can signal through two types of GABAA receptor subunits, often referred to as synaptic GABAA (gamma subunit) and extra-synaptic GABAA (delta subunit). To test the functional roles of these distinct GABAA in regulating circadian rhythms, we developed a multicellular SCN model where we could separately compare the effects of manipulating GABA neurotransmitter or receptor dynamics. Our model predicted that blocking GABA signalling modestly increased synchrony among circadian cells, consistent with published SCN pharmacology. Conversely, the model predicted that lowering GABAA receptor density reduced firing rate, circadian cell fraction, amplitude and synchrony among individual neurons. When we tested these predictions, we found that the knockdown of delta GABAA reduced the amplitude and synchrony of clock gene expression among cells in SCN explants. The model further predicted that increasing gamma GABAA densities could enhance synchrony, as opposed to increasing delta GABAA densities. Overall, our model reveals how blocking GABAA receptors can modestly increase synchrony, while increasing the relative density of gamma over delta subunits can dramatically increase synchrony. We hypothesize that increased gamma GABAA density in the winter could underlie the tighter phase relationships among SCN cells.
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Affiliation(s)
- Natthapong Sueviriyapan
- Department of Chemical Engineering and the Institute for Applied Life Sciences, University of Massachusetts, Amherst, MA, USA
| | | | - Tatiana Simon
- Department of Biology, Washington University in St Louis, Saint Louis, MO, USA
| | - Erik D. Herzog
- Department of Biology, Washington University in St Louis, Saint Louis, MO, USA
| | - Michael A. Henson
- Department of Chemical Engineering and the Institute for Applied Life Sciences, University of Massachusetts, Amherst, MA, USA
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152
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Abstract
Disparities in health care have risen to the forefront of medicine in the past several years. One of the most notable disparities in the research and delivery of health care relates to sex and gender. Sex and gender affect the epidemiology, pathophysiology, and outcomes of disease and social determinants of health and access to medical care. This article discusses some of the history of considering sex as a biologic variable in medical research and clinical care. It also clarifies the definitions and terminology necessary for understanding the biologic and social underpinnings of sex and gender.
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Affiliation(s)
- Shannon Kay
- Department of Medicine, Yale University School of Medicine, 333 Cedar Street, PO Box 208057, New Haven, CT 06519, USA
| | - Margaret A Pisani
- Department of Medicine, Yale University School of Medicine, 333 Cedar Street, PO Box 208057, New Haven, CT 06519, USA.
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153
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Gottlieb LA, Larsen K, Halade GV, Young ME, Thomsen MB. Prolonged QT intervals in mice with cardiomyocyte-specific deficiency of the molecular clock. Acta Physiol (Oxf) 2021; 233:e13707. [PMID: 34176211 DOI: 10.1111/apha.13707] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 06/11/2021] [Accepted: 06/25/2021] [Indexed: 12/19/2022]
Abstract
AIM Cardiac arrhythmias and sudden deaths have diurnal rhythms in humans. The underlying mechanisms are unknown. Mice with cardiomyocyte-specific disruption of the molecular clock genes have lower heart rate than control. Because changes in the QT interval on the electrocardiogram is a clinically used marker of risk of arrhythmias, we sought to test if the biological rhythms of QT intervals are dependent on heart rate and if this dependency is changed when the molecular clock is disrupted. METHODS We implanted radio transmitters in male mice with cardiomyocyte-specific Bmal1 knockout (CBK) and in control mice and recorded 24-h ECGs under diurnal and circadian conditions. We obtained left ventricular monophasic action potentials during pacing in hearts ex vivo. RESULTS Both RR and QT intervals were longer in conscious CBK than control mice (RR: 117 ± 7 vs 110 ± 9 ms, P < .05; and QT: 53 ± 4 vs 48 ± 2 ms, P < .05). The prolonged QT interval was independent of the slow heart rate in CBK mice. The QT interval exhibited diurnal and circadian rhythms in both CBK and control mice. The action potential duration was longer in CBK than in control mice, indicating slower repolarization. Action potential alternans occurred at lower pacing rate in hearts from CBK than control mice (12 ± 3 vs 16 ± 2 Hz, respectively, P < .05). CONCLUSION The bradycardic CBK mice have prolonged ventricular repolarization independent of the heart rate. Diurnal and circadian rhythms in repolarization are preserved in CBK mice and are not a consequence of the 24-h rhythm in heart rate. Arrhythmia vulnerability appears to be increased when the cardiac clock is disrupted.
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Affiliation(s)
- Lisa A. Gottlieb
- Department of Biomedical Sciences University of Copenhagen Denmark
- Department of Experimental Cardiology Amsterdam University Medical Centerlocatie AMC Amsterdam the Netherlands
| | - Karin Larsen
- Department of Biomedical Sciences University of Copenhagen Denmark
| | - Ganesh V. Halade
- Division of Cardiovascular Sciences Department of Medicine University of South Florida Tampa FL USA
| | - Martin E. Young
- Department of Medicine University of Alabama at Birmingham AL USA
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154
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Jiao X, Pei X, Lu D, Qi D, Huang S, He S, Li Z. Microbial Reconstitution Improves Aging-Driven Lacrimal Gland Circadian Dysfunction. THE AMERICAN JOURNAL OF PATHOLOGY 2021; 191:2091-2116. [PMID: 34428426 DOI: 10.1016/j.ajpath.2021.08.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 07/22/2021] [Accepted: 08/03/2021] [Indexed: 12/20/2022]
Abstract
Lacrimal glands are highly susceptible to aging and exhibit age-related structural and functional alterations. However, the mechanisms by which aging affects the lacrimal glands are not well-established. The current study explores the crosstalk between the aging process, gut microbiota, and circadian rhythm in age-associated lacrimal gland dysfunction. C57BL/6J mice were divided into young, old, and fecal microbiota transplant (FMT)-treated old groups. The gut bacterial community diversity was analyzed by 16S rRNA sequencing. Exorbital lacrimal glands (ELGs) were collected at 3-hour intervals over a 24-hour circadian cycle, and total RNA was subjected to high-throughput sequencing. Rhythmic transcriptional data were analyzed using the Jonckheere-Terpstra-Kendall algorithm and bioinformatics analysis technology. Immunostaining was used to identify lymphocytic infiltration, lipid deposition, and nerve innervation in the ELGs. Compared with young mice, old mice underwent a significant gut microbial community shift. The rhythmically transcriptomic profile was significantly reprogrammed over a 24-hour cycle in the old ELG group. Intervention with serial FMT from young donors for 1 month rejuvinated the gut microbial community of the old mice. Most alterations in rhythmic transcriptomic profiling were improved. Furthermore, chronic inflammation, lipid deposition, and aberrant neural response of the aging lacrimal glands were significantly reduced. Thus, the study shows that reconstitution of age-associated gut dysbiosis with FMTs from young donors improves aging-driven lacrimal gland circadian dysfunction.
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Affiliation(s)
- Xinwei Jiao
- Henan Eye Institute, Henan Eye Hospital, and Henan Key Laboratory of Ophthalmology and Visual Science, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, People's Hospital of Henan University, Zhengzhou, China
| | - Xiaoting Pei
- Henan Eye Institute, Henan Eye Hospital, and Henan Key Laboratory of Ophthalmology and Visual Science, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, People's Hospital of Henan University, Zhengzhou, China
| | - Dingli Lu
- Henan Eye Institute, Henan Eye Hospital, and Henan Key Laboratory of Ophthalmology and Visual Science, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, People's Hospital of Henan University, Zhengzhou, China
| | - Di Qi
- Henan Eye Institute, Henan Eye Hospital, and Henan Key Laboratory of Ophthalmology and Visual Science, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, People's Hospital of Henan University, Zhengzhou, China
| | - Shenzhen Huang
- Henan Eye Institute, Henan Eye Hospital, and Henan Key Laboratory of Ophthalmology and Visual Science, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, People's Hospital of Henan University, Zhengzhou, China
| | - Siyu He
- Henan Eye Institute, Henan Eye Hospital, and Henan Key Laboratory of Ophthalmology and Visual Science, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, People's Hospital of Henan University, Zhengzhou, China
| | - Zhijie Li
- Henan Eye Institute, Henan Eye Hospital, and Henan Key Laboratory of Ophthalmology and Visual Science, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, People's Hospital of Henan University, Zhengzhou, China.
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155
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Casey T, Suarez-Trujillo A, Cummings S, Huff K, Crodian J, Bhide K, Aduwari C, Teeple K, Shamay A, Mabjeesh SJ, San Miguel P, Thimmapuram J, Plaut K. Core circadian clock transcription factor BMAL1 regulates mammary epithelial cell growth, differentiation, and milk component synthesis. PLoS One 2021; 16:e0248199. [PMID: 34415905 PMCID: PMC8378744 DOI: 10.1371/journal.pone.0248199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 08/06/2021] [Indexed: 11/18/2022] Open
Abstract
The role the mammary epithelial circadian clock plays in gland development and lactation is unknown. We hypothesized that mammary epithelial clocks function to regulate mammogenesis and lactogenesis, and propose the core clock transcription factor BMAL1:CLOCK regulates genes that control mammary epithelial development and milk synthesis. Our objective was to identify transcriptional targets of BMAL1 in undifferentiated (UNDIFF) and lactogen differentiated (DIFF) mammary epithelial cells (HC11) using ChIP-seq. Ensembl gene IDs with the nearest transcriptional start site to ChIP-seq peaks were explored as potential targets, and represented 846 protein coding genes common to UNDIFF and DIFF cells and 2773 unique to DIFF samples. Genes with overlapping peaks between samples (1343) enriched cell-cell adhesion, membrane transporters and lipid metabolism categories. To functionally verify targets, an HC11 line with Bmal1 gene knocked out (BMAL1-KO) using CRISPR-CAS was created. BMAL1-KO cultures had lower cell densities over an eight-day growth curve, which was associated with increased (p<0.05) levels of reactive oxygen species and lower expression of superoxide dismutase 3 (Sod3). RT-qPCR analysis also found lower expression of the putative targets, prolactin receptor (Prlr), Ppara, and beta-casein (Csn2). Findings support our hypothesis and highlight potential importance of clock in mammary development and substrate transport.
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Affiliation(s)
- Theresa Casey
- Department of Animal Science, Purdue University, West Lafayette, IN, United States of America
| | - Aridany Suarez-Trujillo
- Department of Animal Science, Purdue University, West Lafayette, IN, United States of America
| | - Shelby Cummings
- Department of Animal Science, Purdue University, West Lafayette, IN, United States of America
| | - Katelyn Huff
- Department of Animal Science, Purdue University, West Lafayette, IN, United States of America
| | - Jennifer Crodian
- Department of Animal Science, Purdue University, West Lafayette, IN, United States of America
| | - Ketaki Bhide
- Bioinformatics Core, Purdue University, West Lafayette, IN, United States of America
| | - Clare Aduwari
- Department of Animal Science, Purdue University, West Lafayette, IN, United States of America
| | - Kelsey Teeple
- Department of Animal Science, Purdue University, West Lafayette, IN, United States of America
| | - Avi Shamay
- Animal Science Institute, Agriculture Research Origination, The Volcani Center, Rishon Letsiyon, Israel
| | - Sameer J. Mabjeesh
- Department of Animal Sciences, The Robert H. Smith Faculty of Agriculture, Food, and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
| | - Phillip San Miguel
- Genomics Core, Purdue University, West Lafayette, IN, United States of America
| | - Jyothi Thimmapuram
- Bioinformatics Core, Purdue University, West Lafayette, IN, United States of America
| | - Karen Plaut
- Department of Animal Science, Purdue University, West Lafayette, IN, United States of America
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156
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Breitenbach T, Helfrich-Förster C, Dandekar T. An effective model of endogenous clocks and external stimuli determining circadian rhythms. Sci Rep 2021; 11:16165. [PMID: 34373483 PMCID: PMC8352901 DOI: 10.1038/s41598-021-95391-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 07/23/2021] [Indexed: 02/07/2023] Open
Abstract
Circadian endogenous clocks of eukaryotic organisms are an established and rapidly developing research field. To investigate and simulate in an effective model the effect of external stimuli on such clocks and their components we developed a software framework for download and simulation. The application is useful to understand the different involved effects in a mathematical simple and effective model. This concerns the effects of Zeitgebers, feedback loops and further modifying components. We start from a known mathematical oscillator model, which is based on experimental molecular findings. This is extended with an effective framework that includes the impact of external stimuli on the circadian oscillations including high dose pharmacological treatment. In particular, the external stimuli framework defines a systematic procedure by input-output-interfaces to couple different oscillators. The framework is validated by providing phase response curves and ranges of entrainment. Furthermore, Aschoffs rule is computationally investigated. It is shown how the external stimuli framework can be used to study biological effects like points of singularity or oscillators integrating different signals at once. The mathematical framework and formalism is generic and allows to study in general the effect of external stimuli on oscillators and other biological processes. For an easy replication of each numerical experiment presented in this work and an easy implementation of the framework the corresponding Mathematica files are fully made available. They can be downloaded at the following link: https://www.biozentrum.uni-wuerzburg.de/bioinfo/computing/circadian/ .
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Affiliation(s)
- Tim Breitenbach
- grid.8379.50000 0001 1958 8658Institut für Mathematik, Universität Würzburg, Emil-Fischer-Strasse 30, 97074 Würzburg, Germany
| | | | - Thomas Dandekar
- grid.8379.50000 0001 1958 8658Biozentrum, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
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157
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Physiological rhythms are influenced by photophase wavelength in a nocturnal and a diurnal rodent species from South Africa. Physiol Behav 2021; 240:113551. [PMID: 34375624 DOI: 10.1016/j.physbeh.2021.113551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 08/02/2021] [Accepted: 08/04/2021] [Indexed: 11/22/2022]
Abstract
The quality and quantity of light changes significantly over the course of the day. The effect of light intensity on physiological and behavioural responses of animals has been well documented, particularly during the scotophase, but the effect of the wavelength of light, particularly during the photophase, less so. We assessed the daily responses in urine production, urinary 6-sulfatoxymelatonin (6-SMT) and glucocorticoid metabolite (uGCM) concentrations in the nocturnal Namaqua rock mouse (Micaelamys namaquensis) and diurnal four striped field mouse (Rhabdomys pumilio) under varying wavelengths of near monochromatic photophase (daytime) lighting. Animals were exposed to a short-wavelength light cycle (SWLC; ∼465-470 nm), a medium-wavelength light cycle (MWLC; ∼515-520 nm) and a long-wavelength light cycle (LWLC; ∼625-630 nm). The SWLC significantly attenuated mean daily urine production rates and the mean daily levels of urinary 6-SMT and of uGCM were inversely correlated with wavelength in both species. The presence of the SWLC greatly augmented overall daily 6-SMT levels, and simultaneously led to the highest uGCM concentrations in both species. In M. namaquensis, the urine production rate and urinary 6-SMT concentrations were significantly higher during the scotophase compared to the photophase under the SWLC and MWLC, whereas the uGCM concentrations were significantly higher during the scotophase under all WLCs. In R. pumilio, the urine production rate and uGCM were significantly higher during the scotophase of the SWLC, not the MWLC and LWLC. Our results illustrate that wavelength in the photophase plays a central role in the entrainment of rhythms in diurnal and nocturnal African rodent species.
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158
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Sen P, Molinero-Perez A, O'Riordan KJ, McCafferty CP, O'Halloran KD, Cryan JF. Microbiota and sleep: awakening the gut feeling. Trends Mol Med 2021; 27:935-945. [PMID: 34364787 DOI: 10.1016/j.molmed.2021.07.004] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 07/05/2021] [Accepted: 07/05/2021] [Indexed: 02/07/2023]
Abstract
Various lifestyle and environmental factors are known to influence sleep. Increasingly, evidence points to a role for the microbiota in regulating brain and behaviour. This article explores how the microbiota-gut-brain axis affects sleep directly and indirectly. We summarize the possible molecular mechanisms underlying sleep-microbiome interactions and discuss how various factors interact with the gut microbiota to influence sleep. Furthermore, we present the current evidence of alterations of the microbiota-gut-brain axis in various sleep disorders and pathologies where comorbid sleep disturbances are common. Since manipulating the gut microbiota could potentially improve sleep, we outline ways in which this can be achieved.
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Affiliation(s)
- Paromita Sen
- APC Microbiome Ireland, University College Cork, Cork, Ireland
| | | | | | - Cian P McCafferty
- APC Microbiome Ireland, University College Cork, Cork, Ireland; Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland
| | - Ken D O'Halloran
- APC Microbiome Ireland, University College Cork, Cork, Ireland; Department of Physiology, University College Cork, Cork, Ireland
| | - John F Cryan
- APC Microbiome Ireland, University College Cork, Cork, Ireland; Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland.
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159
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Hart DW, van Jaarsveld B, Lasch KG, Grenfell KL, Oosthuizen MK, Bennett NC. Ambient Temperature as a Strong Zeitgeber of Circadian Rhythms in Response to Temperature Sensitivity and Poor Heat Dissipation Abilities in Subterranean African Mole-Rats. J Biol Rhythms 2021; 36:461-469. [PMID: 34343446 DOI: 10.1177/07487304211034287] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Mammals have evolved circadian rhythms in internal biological processes and behaviors, such as locomotor activity (LA), to synchronize to the environmental conditions they experience. Photic entrainment of LA has been well established; however, non-photic entrainment, such as ambient temperature (Ta), has received much less attention. To address this dearth of knowledge, we exposed two subterranean endothermic-homeothermic African mole-rat species, the solitary Cape mole-rat (Georychus capensis [GC]) and social Mahali mole-rat (Cryptomys hottentotus mahali [CHM]), to varying Ta cycles in the absence of light. We showed that the LA rhythms of these two species entrain to Ta cycles and that the majority of LA occurred during the coolest 12-h period. LA confined to the coolest Ta periods may be the direct consequence of the poor heat dissipation abilities of African mole-rats brought about by physiological and ecological constraints. Recently, it has been hypothesized that Ta is only a strong zeitgeber for circadian rhythms in species whose thermoregulatory abilities are sensitive to changes in Ta (i.e., heterotherms and ectotherms), which previously has excluded endothermic-homeothermic mammals. However, this study demonstrates that Ta is a strong zeitgeber or entrainer for circadian rhythms of LA in subterranean endothermic-homeothermic mammals as a consequence of their sensitivity to changes in Ta brought about by their poor heat dissipation abilities. This study reinforces the intimate link between circadian rhythms and thermoregulation and conclusively, for the first time, provides evidence that Ta is a strong zeitgeber for endothermic-homeothermic mammals.
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Affiliation(s)
- Daniel W Hart
- Mammal Research Institute, Department of Zoology & Entomology, University of Pretoria, Pretoria, South Africa
| | - Barry van Jaarsveld
- Department of Physical Geography, Utrecht University, Utrecht, The Netherlands
| | - Kiara G Lasch
- Mammal Research Institute, Department of Zoology & Entomology, University of Pretoria, Pretoria, South Africa
| | - Kerryn L Grenfell
- Mammal Research Institute, Department of Zoology & Entomology, University of Pretoria, Pretoria, South Africa
| | - Maria K Oosthuizen
- Mammal Research Institute, Department of Zoology & Entomology, University of Pretoria, Pretoria, South Africa
| | - Nigel C Bennett
- Mammal Research Institute, Department of Zoology & Entomology, University of Pretoria, Pretoria, South Africa
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160
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Fernandes P, Pereira LDM, Horta NAC, Cardoso TSR, Coimbra CC, Szawka RE, Pereira GS, Poletini MO. Social interaction masking contributes to changes in the activity of the suprachiasmatic nucleus and impacts on circadian rhythms. Physiol Behav 2021; 237:113420. [PMID: 33878315 DOI: 10.1016/j.physbeh.2021.113420] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 04/05/2021] [Accepted: 04/07/2021] [Indexed: 11/17/2022]
Abstract
Light is the most powerful temporal cue that entrains physiology and behavior through modulation of the suprachiasmatic nucleus (SCN) of the hypothalamus. However, on a daily basis, individuals face a combination of light and several non-photic cues, such as social interaction. In order to investigate whether SCN activity and SCN-driven rhythms are altered by social interaction, adult male C57BLJ/6 mice were maintained in groups of 3-4 animals per cage or 1 animal per cage (socially isolated) under 12:12 h / light:dark (LD) cycles or constant darkness (DD). Analysis of the two anatomical subdivisions (ventral, v and dorsal, d) of the medial SCN revealed an effect of housing conditions on the d-SCN but not on the v-SCN on the number of c-Fos immunoreactive (ir) neurons. As such, 2 h after the light-phase onset d-SCN c-Fos-ir number was lower in single-housed mice under LD. Importantly, under DD there were no effect of housing conditions in the number of c-Fos-ir SCN neurons. Social isolation increased the amplitude and strength of SCN-driven rhythm of body temperature (Tc) entrained to LD and it advanced its onset, uncoupling with spontaneous locomotor activity (SLA) rhythm, without altering endogenous Tc and SLA rhythms expressed under DD. Associated with reduced Tc in the light phase, single-housed mice showed reduced body weight. However, these phenotypes were not accompanied by changes in the number of c-Fos-ir neurons in the preoptic area (POA), which are known to regulate energy metabolism and Tc. Altogether, these results imply that the social interaction masking effect on the d-SCN is added to that of light stimulus, in order to achieve full c-Fos expression in the SCN, which, in turn seems to be required to maintain daily-phase coherence between the photo-entrained rhythms of Tc and SLA. There might be an inter-relationship between masking (social interaction) and entrainment stimulus (light) that impacts the circadian parameters of the photo-entrained Tc rhythm. As such, in the absence of social interactions a more robust Tc rhythm is shown. This inter-relationship seems to occur in the dorsal subdivision of the SCN but not in the POA.
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Affiliation(s)
- Paola Fernandes
- Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Luciana de Melo Pereira
- Núcleo de Neurociências, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Nayara Abreu Coelho Horta
- Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Thaís Santana Rocha Cardoso
- Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Cândido Celso Coimbra
- Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Raphael Escorsim Szawka
- Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Grace Schenatto Pereira
- Núcleo de Neurociências, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Maristela Oliveira Poletini
- Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
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161
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Wagner PM, Prucca CG, Caputto BL, Guido ME. Adjusting the Molecular Clock: The Importance of Circadian Rhythms in the Development of Glioblastomas and Its Intervention as a Therapeutic Strategy. Int J Mol Sci 2021; 22:8289. [PMID: 34361055 PMCID: PMC8348990 DOI: 10.3390/ijms22158289] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 07/26/2021] [Accepted: 07/29/2021] [Indexed: 12/12/2022] Open
Abstract
Gliomas are solid tumors of the central nervous system (CNS) that originated from different glial cells. The World Health Organization (WHO) classifies these tumors into four groups (I-IV) with increasing malignancy. Glioblastoma (GBM) is the most common and aggressive type of brain tumor classified as grade IV. GBMs are resistant to conventional therapies with poor prognosis after diagnosis even when the Stupp protocol that combines surgery and radiochemotherapy is applied. Nowadays, few novel therapeutic strategies have been used to improve GBM treatment, looking for higher efficiency and lower side effects, but with relatively modest results. The circadian timing system temporally organizes the physiology and behavior of most organisms and daily regulates several cellular processes in organs, tissues, and even in individual cells, including tumor cells. The potentiality of the function of the circadian clock on cancer cells modulation as a new target for novel treatments with a chronobiological basis offers a different challenge that needs to be considered in further detail. The present review will discuss state of the art regarding GBM biology, the role of the circadian clock in tumor progression, and new chrono-chemotherapeutic strategies applied for GBM treatment.
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Affiliation(s)
- Paula M. Wagner
- CIQUIBIC-CONICET, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina; (P.M.W.); (C.G.P.); (B.L.C.)
- Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina
| | - César G. Prucca
- CIQUIBIC-CONICET, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina; (P.M.W.); (C.G.P.); (B.L.C.)
- Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina
| | - Beatriz L. Caputto
- CIQUIBIC-CONICET, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina; (P.M.W.); (C.G.P.); (B.L.C.)
- Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina
| | - Mario E. Guido
- CIQUIBIC-CONICET, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina; (P.M.W.); (C.G.P.); (B.L.C.)
- Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba 5000, Argentina
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Adjusting the Molecular Clock: The Importance of Circadian Rhythms in the Development of Glioblastomas and Its Intervention as a Therapeutic Strategy. Int J Mol Sci 2021; 22:8289. [PMID: 34361055 PMCID: PMC8348990 DOI: 10.3390/ijms22158289;] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Gliomas are solid tumors of the central nervous system (CNS) that originated from different glial cells. The World Health Organization (WHO) classifies these tumors into four groups (I-IV) with increasing malignancy. Glioblastoma (GBM) is the most common and aggressive type of brain tumor classified as grade IV. GBMs are resistant to conventional therapies with poor prognosis after diagnosis even when the Stupp protocol that combines surgery and radiochemotherapy is applied. Nowadays, few novel therapeutic strategies have been used to improve GBM treatment, looking for higher efficiency and lower side effects, but with relatively modest results. The circadian timing system temporally organizes the physiology and behavior of most organisms and daily regulates several cellular processes in organs, tissues, and even in individual cells, including tumor cells. The potentiality of the function of the circadian clock on cancer cells modulation as a new target for novel treatments with a chronobiological basis offers a different challenge that needs to be considered in further detail. The present review will discuss state of the art regarding GBM biology, the role of the circadian clock in tumor progression, and new chrono-chemotherapeutic strategies applied for GBM treatment.
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163
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De Bartolo D, De Giorgi C, Compagnucci L, Betti V, Antonucci G, Morone G, Paolucci S, Iosa M. Effects of cognitive workload on heart and locomotor rhythms coupling. Neurosci Lett 2021; 762:136140. [PMID: 34324958 DOI: 10.1016/j.neulet.2021.136140] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 07/10/2021] [Accepted: 07/23/2021] [Indexed: 11/18/2022]
Abstract
Different physiological signals could be coupled under specific conditions, in some cases related to pathologies or reductions in system complexity. Cardiac-locomotor synchronization (CLS) has been one of the most investigating coupling. The influence of a cognitive task on walking was investigated in dual-task experiments, but how different cognitive tasks may influence CLS has poorly been investigated. Twenty healthy subjects performed a dual-task walking (coupled with verbal fluency vs calculation) on a treadmill at three different speeds (comfortable speed CS; fast-speed: CS + 2 km/h; slow-speed: CS-2 km/h) while cardiac and walking rhythms were recorded using surface electrodes and a triaxial accelerometer, respectively. According to previous studies, we found a cognitive-motor interference for which cognitive performance was affected by motor exercise, but not vice-versa. We found a CLS at the baseline condition, at fast speed in both cognitive tasks, while at comfortable speed only for the verbal fluency task. In conclusion, the cardiac and locomotor rhythms were not coupled at slow speed and at comfortable speed during subtraction task. Cognitive performances generally increased at faster speed, when cardiac locomotor coupling was stronger.
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Affiliation(s)
- Daniela De Bartolo
- Department of Psychology, Sapienza University of Rome, Italy; IRRCS Santa Lucia Foundation, Rome, Italy.
| | - Chiara De Giorgi
- Department of Psychology, Sapienza University of Rome, Italy; Braintrends Ltd, Rome, Italy
| | - Luca Compagnucci
- Department of Psychology, Sapienza University of Rome, Italy; Braintrends Ltd, Rome, Italy
| | - Viviana Betti
- Department of Psychology, Sapienza University of Rome, Italy; IRRCS Santa Lucia Foundation, Rome, Italy; Braintrends Ltd, Rome, Italy
| | - Gabriella Antonucci
- Department of Psychology, Sapienza University of Rome, Italy; IRRCS Santa Lucia Foundation, Rome, Italy
| | | | | | - Marco Iosa
- Department of Psychology, Sapienza University of Rome, Italy; IRRCS Santa Lucia Foundation, Rome, Italy
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164
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Chairina G, Yoshino K, Kiyono K, Watanabe E. Ischemic Stroke Risk Assessment by Multiscale Entropy Analysis of Heart Rate Variability in Patients with Persistent Atrial Fibrillation. ENTROPY 2021; 23:e23070918. [PMID: 34356459 PMCID: PMC8305541 DOI: 10.3390/e23070918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 07/18/2021] [Accepted: 07/18/2021] [Indexed: 11/17/2022]
Abstract
It has been recognized that heart rate variability (HRV), defined as the fluctuation of ventricular response intervals in atrial fibrillation (AFib) patients, is not completely random, and its nonlinear characteristics, such as multiscale entropy (MSE), contain clinically significant information. We investigated the relationship between ischemic stroke risk and HRV with a large number of stroke-naïve AFib patients (628 patients), focusing on those who had never developed an ischemic/hemorrhagic stroke before the heart rate measurement. The CHA2DS2−VASc score was calculated from the baseline clinical characteristics, while the HRV analysis was made from the recording of morning, afternoon, and evening. Subsequently, we performed Kaplan–Meier method and cumulative incidence function with mortality as a competing risk to estimate the survival time function. We found that patients with sample entropy (SE(s)) ≥ 0.68 at 210 s had a significantly higher risk of an ischemic stroke occurrence in the morning recording. Meanwhile, the afternoon recording showed that those with SE(s) ≥ 0.76 at 240 s and SE(s) ≥ 0.78 at 270 s had a significantly lower risk of ischemic stroke occurrence. Therefore, SE(s) at 210 s (morning) and 240 s ≤ s ≤ 270 s (afternoon) demonstrated a statistically significant predictive value for ischemic stroke in stroke-naïve AFib patients.
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Affiliation(s)
- Ghina Chairina
- Graduate School of Science and Technology, Kwansei Gakuin University, Sanda 669-1337, Japan;
- Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, Indonesia
| | - Kohzoh Yoshino
- Graduate School of Science and Technology, Kwansei Gakuin University, Sanda 669-1337, Japan;
- Correspondence:
| | - Ken Kiyono
- Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan;
| | - Eiichi Watanabe
- Department of Cardiology, Fujita Health University Bantane Hospital, Nagoya 454-8509, Japan;
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165
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Trebucq LL, Cardama GA, Lorenzano Menna P, Golombek DA, Chiesa JJ, Marpegan L. Timing of Novel Drug 1A-116 to Circadian Rhythms Improves Therapeutic Effects against Glioblastoma. Pharmaceutics 2021; 13:1091. [PMID: 34371781 PMCID: PMC8309043 DOI: 10.3390/pharmaceutics13071091] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 07/10/2021] [Accepted: 07/13/2021] [Indexed: 11/28/2022] Open
Abstract
The Ras homologous family of small guanosine triphosphate-binding enzymes (GTPases) is critical for cell migration and proliferation. The novel drug 1A-116 blocks the interaction site of the Ras-related C3 botulinum toxin substrate 1 (RAC1) GTPase with some of its guanine exchange factors (GEFs), such as T-cell lymphoma invasion and metastasis 1 (TIAM1), inhibiting cell motility and proliferation. Knowledge of circadian regulation of targets can improve chemotherapy in glioblastoma. Thus, circadian regulation in the efficacy of 1A-116 was studied in LN229 human glioblastoma cells and tumor-bearing nude mice. METHODS Wild-type LN229 and BMAL1-deficient (i.e., lacking a functional circadian clock) LN229E1 cells were assessed for rhythms in TIAM1, BMAL1, and period circadian protein homolog 1 (PER1), as well as Tiam1, Bmal1, and Rac1 mRNA levels. The effects of 1A-116 on proliferation, apoptosis, and migration were then assessed upon applying the drug at different circadian times. Finally, 1A-116 was administered to tumor-bearing mice at two different circadian times. RESULTS In LN229 cells, circadian oscillations were found for BMAL1, PER1, and TIAM1 (mRNA and protein), and for the effects of 1A-116 on proliferation, apoptosis, and migration, which were abolished in LN229E1 cells. Increased survival time was observed in tumor-bearing mice when treated with 1A-116 at the end of the light period (zeitgeber time 12, ZT12) compared either to animals treated at the beginning (ZT3) or with vehicle. CONCLUSIONS These results unveil the circadian modulation in the efficacy of 1A-116, likely through RAC1 pathway rhythmicity, suggesting that a chronopharmacological approach is a feasible strategy to improve glioblastoma treatment.
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Affiliation(s)
- Laura Lucía Trebucq
- Laboratorio de Cronobiología, Universidad Nacional de Quilmes-CONICET, Bernal 1876, Buenos Aires, Argentina; (L.L.T.); (D.A.G.)
| | - Georgina Alexandra Cardama
- Laboratorio de Oncología Molecular, Universidad Nacional de Quilmes-CONICET, Bernal 1876, Buenos Aires, Argentina; (G.A.C.); (P.L.M.)
| | - Pablo Lorenzano Menna
- Laboratorio de Oncología Molecular, Universidad Nacional de Quilmes-CONICET, Bernal 1876, Buenos Aires, Argentina; (G.A.C.); (P.L.M.)
| | - Diego Andrés Golombek
- Laboratorio de Cronobiología, Universidad Nacional de Quilmes-CONICET, Bernal 1876, Buenos Aires, Argentina; (L.L.T.); (D.A.G.)
| | - Juan José Chiesa
- Laboratorio de Cronobiología, Universidad Nacional de Quilmes-CONICET, Bernal 1876, Buenos Aires, Argentina; (L.L.T.); (D.A.G.)
| | - Luciano Marpegan
- Departamento de Física Médica, Comisión Nacional de Energía Atómica, Bariloche 8400, Río Negro, Argentina
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166
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Shilovsky GA, Putyatina TS, Morgunova GV, Seliverstov AV, Ashapkin VV, Sorokina EV, Markov AV, Skulachev VP. A Crosstalk between the Biorhythms and Gatekeepers of Longevity: Dual Role of Glycogen Synthase Kinase-3. BIOCHEMISTRY (MOSCOW) 2021; 86:433-448. [PMID: 33941065 PMCID: PMC8033555 DOI: 10.1134/s0006297921040052] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
This review discusses genetic and molecular pathways that link circadian timing with metabolism, resulting in the emergence of positive and negative regulatory feedback loops. The Nrf2 pathway is believed to be a component of the anti-aging program responsible for the healthspan and longevity. Nrf2 enables stress adaptation by activating cell antioxidant defense and other metabolic processes via control of expression of over 200 target genes in response to various types of stress. The GSK3 system represents a “regulating valve” that controls fine oscillations in the Nrf2 level, unlike Keap1, which prevents significant changes in the Nrf2 content in the absence of oxidative stress and which is inactivated by the oxidative stress. Furthermore, GSK3 modifies core circadian clock proteins (Bmal1, Clock, Per, Cry, and Rev-erbα). Phosphorylation by GSK3 leads to the inactivation and degradation of circadian rhythm-activating proteins (Bmal1 and Clock) and vice versa to the activation and nuclear translocation of proteins suppressing circadian rhythms (Per and Rev-erbα) with the exception of Cry protein, which is likely to be implicated in the fine tuning of biological clock. Functionally, GSK3 appears to be one of the hubs in the cross-regulation of circadian rhythms and antioxidant defense. Here, we present the data on the crosstalk between the most powerful cell antioxidant mechanism, the Nrf2 system, and the biorhythm-regulating system in mammals, including the impact of GSK3 overexpression and knockout on the Nrf2 signaling. Understanding the interactions between the regulatory cascades linking homeostasis maintenance and cell response to oxidative stress will help in elucidating molecular mechanisms that underlie aging and longevity.
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Affiliation(s)
- Gregory A Shilovsky
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991, Russia. .,Faculty of Biology, Lomonosov Moscow State University, Moscow, 119234, Russia.,Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, 127051, Russia
| | - Tatyana S Putyatina
- Faculty of Biology, Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Galina V Morgunova
- Faculty of Biology, Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Alexander V Seliverstov
- Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, 127051, Russia
| | - Vasily V Ashapkin
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991, Russia
| | - Elena V Sorokina
- Faculty of Biology, Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Alexander V Markov
- Faculty of Biology, Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Vladimir P Skulachev
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991, Russia
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167
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Balachandran DD, Miller MA, Faiz SA, Yennurajalingam S, Innominato PF. Evaluation and Management of Sleep and Circadian Rhythm Disturbance in Cancer. Curr Treat Options Oncol 2021; 22:81. [PMID: 34213651 DOI: 10.1007/s11864-021-00872-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/20/2021] [Indexed: 12/16/2022]
Abstract
OPINION STATEMENT Sleep and circadian rhythm disturbance are among the most commonly experienced symptoms in patients with cancer. These disturbances occur throughout the spectrum of cancer care from diagnosis, treatment, and long into survivorship. The pathogenesis of these symptoms and disturbances is based on common inflammatory pathways related to cancer and its' treatments. The evaluation of sleep and circadian disorders requires an understanding of how these symptoms cluster with other cancer-related symptoms and potentiate each other. A thorough evaluation of these symptoms and disorders utilizing validated diagnostic tools, directed review of clinical information, and diagnostic testing is recommended. Treatment of sleep and circadian disturbance in cancer patients should be based on the findings of a detailed evaluation, including specific treatment of primary sleep and circadian disorders, and utilize integrative and personalised management of cancer-related symptoms through multiple pharmacologic and non-pharmacologic modalities. Recognition, evaluation, and treatment of sleep and circadian rhythm disturbance in cancer may lead to improved symptom management, quality of life, and outcomes.
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Affiliation(s)
- Diwakar D Balachandran
- Department of Pulmonary Medicine, Division of Internal Medicine, The University of Texas MD Anderson Cancer Center, 1400 Pressler Street. Unit 1462, Houston, TX, 77030-4009, USA.
| | - Michelle A Miller
- Division of Health Sciences (Mental Health & Wellbeing), University of Warwick, Warwick Medical School, Gibbet Hill, Coventry, UK
| | - Saadia A Faiz
- Department of Pulmonary Medicine, Division of Internal Medicine, The University of Texas MD Anderson Cancer Center, 1400 Pressler Street. Unit 1462, Houston, TX, 77030-4009, USA
| | - Sriram Yennurajalingam
- Department of Palliative, Rehabilitation, and Integrative Medicine, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Pasquale F Innominato
- North Wales Cancer Treatment Centre, Ysbyty Gwynedd, Betsi Cadwaladr University Health Board, Bangor, UK
- Cancer Chronotherapy Team, Warwick Medical School, Coventry, UK
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168
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Ahmed T, Wilson D. Exploiting circadian memory to hasten recovery from circadian misalignment. CHAOS (WOODBURY, N.Y.) 2021; 31:073130. [PMID: 34340336 DOI: 10.1063/5.0053441] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 06/23/2021] [Indexed: 06/13/2023]
Abstract
Recent years have seen a sustained interest in the development of circadian reentrainment strategies to limit the deleterious effects of jet lag. Due to the dynamical complexity of many circadian models, phase-based model reduction techniques are often an imperative first step in the analysis. However, amplitude coordinates that capture lingering effects (i.e., memory) from past inputs are often neglected. In this work, we focus on these amplitude coordinates using an operational phase and an isostable coordinate framework in the context of the development of jet-lag amelioration strategies. By accounting for the influence of circadian memory, we identify a latent phase shift that can prime one's circadian cycle to reentrain more rapidly to an expected time-zone shift. A subsequent optimal control problem is proposed that balances the trade-off between control effort and the resulting latent phase shift. Data-driven model identification techniques for the inference of necessary reduced order, phase-amplitude-based models are considered in situations where the underlying model equations are unknown, and numerical results are illustrated in both a simple planar model and in a coupled population of circadian oscillators.
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Affiliation(s)
- Talha Ahmed
- Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, Knoxville, Tennessee 37996, USA
| | - Dan Wilson
- Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, Knoxville, Tennessee 37996, USA
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169
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Alzate-Correa D, Aten S, Campbell MJ, Hoyt KR, Obrietan K. Light-induced changes in the suprachiasmatic nucleus transcriptome regulated by the ERK/MAPK pathway. PLoS One 2021; 16:e0249430. [PMID: 34191798 PMCID: PMC8244859 DOI: 10.1371/journal.pone.0249430] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 03/17/2021] [Indexed: 11/18/2022] Open
Abstract
The mammalian master circadian pacemaker within the suprachiasmatic nucleus (SCN) maintains tight entrainment to the 24 hr light/dark cycle via a sophisticated clock-gated rhythm in the responsiveness of the oscillator to light. A central event in this light entrainment process appears to be the rapid induction of gene expression via the ERK/MAPK pathway. Here, we used RNA array-based profiling in combination with pharmacological disruption methods to examine the contribution of ERK/MAPK signaling to light-evoked gene expression. Transient photic stimulation during the circadian night, but not during the circadian day, triggered marked changes in gene expression, with early-night light predominately leading to increased gene expression and late-night light predominately leading to gene downregulation. Functional analysis revealed that light-regulated genes are involved in a diversity of physiological processes, including DNA transcription, RNA translation, mRNA processing, synaptic plasticity and circadian timing. The disruption of MAPK signaling led to a marked reduction in light-evoked gene regulation during the early night (32/52 genes) and late night (190/191 genes); further, MAPK signaling was found to gate gene expression across the circadian cycle. Together, these experiments reveal potentially important insights into the transcriptional-based mechanisms by which the ERK/MAPK pathway regulates circadian clock timing and light-evoked clock entrainment.
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Affiliation(s)
- Diego Alzate-Correa
- Division of Pharmaceutics and Pharmacology, Ohio State University, Columbus, OH, United States of America
| | - Sydney Aten
- Department of Neuroscience, Ohio State University, Columbus, OH, United States of America
| | - Moray J. Campbell
- Division of Pharmaceutics and Pharmacology, Ohio State University, Columbus, OH, United States of America
| | - Kari R. Hoyt
- Division of Pharmaceutics and Pharmacology, Ohio State University, Columbus, OH, United States of America
| | - Karl Obrietan
- Department of Neuroscience, Ohio State University, Columbus, OH, United States of America
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170
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Eichhorn G, Boom MP, van der Jeugd HP, Mulder A, Wikelski M, Maloney SK, Goh GH. Circadian and Seasonal Patterns of Body Temperature in Arctic Migratory and Temperate Non-migratory Geese. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2021.699917] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Arctic migration presents unique challenges to circadian physiology. In addition to the metabolic cost of maintaining a relatively high body temperature (Tb) above ambient temperature, migratory birds are also exposed to rapidly changing light conditions as they transition between light-dark cycles and a 24-hour polar day. A previous study suggested that Arctic-migratory barnacle geese (Branta leucopsis) may utilise adaptive heterothermy (i.e., a controlled decrease in core Tb) during and around the autumn migratory period in order to minimise the metabolic cost of migration, but the impact of seasonally changing daylight conditions on other parameters of the circadian profile of Tb in these geese remained obscure. Here, we provide a detailed comparative analysis on the circadian rhythm of Tb and its seasonal development in free-living barnacle geese from three study populations that differ in their migratory behaviour and in the environments they occupy. We recorded abdominal Tb in non-migratory geese from a temperate breeding colony in Netherlands and in migratory geese from a colony in the Russian low Arctic, and analysed these data together with previously published Tb data on geese from a migratory colony in the high Arctic of Svalbard. We found that the circadian Tb profile in the barnacle goose was well aligned with the daily and seasonally changing daylight conditions. In the migratory populations, a fast re-entrainment of the rhythm and its phase was observed when zeitgeber conditions changed during migratory movements. The circadian rhythmicity of Tb was lost once the geese encountered permanent daylight at their northern staging and breeding sites. Circadian Tb rhythmicity was re-established when the period of permanent daylight ended, at rates corresponding to rates of seasonal changes in daylength in the high and low Arctic. Although our data corroborated findings of a decrease in daily mean Tb before autumn migration in both migratory populations in this study, the pre-migratory decrease in Tb was less drastic than previously reported. Moreover, in contrast to previous study, the decrease in Tb stopped at the onset of migration. Overall, our data reveal no evidence that heterothermy in the barnacle goose is functionally linked to migration.
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171
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Chronic lead exposure alters photic entrainment of locomotor activity rhythm and neuronal photoactivation in the suprachiasmatic nucleus of the adult rat. J Chem Neuroanat 2021; 117:101991. [PMID: 34182089 DOI: 10.1016/j.jchemneu.2021.101991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 06/06/2021] [Accepted: 06/14/2021] [Indexed: 11/21/2022]
Abstract
Chronic lead (Pb) exposure affects the circadian physiological processes regulated by suprachiasmatic nucleus (SCN), which is synchronized (entrainment) by light. Disorders in the entrainment capacity of an organism alter its performance to interact with the environment, thus affecting its health status. The objectives of the present study were to evaluate whether chronic early Pb exposure affects the entrainment of the circadian rhythm of locomotor activity by light and to explore the possible mechanisms involved. Adult male Wistar rats, control and chronically exposed to Pb (320 ppm) in drinking water from gestation to adult age, were used. Assessment of the metal level showed a significant increase of Pb in the blood, hypothalamus and prefrontal cortex of the experimental rats. Continuous registrations of locomotor activity (12 h:12 h light-dark cycle) depicted that Pb induces important delay of this activity when the light was turned off. The Pb exposed animals entrained faster with a photoperiod delay of 6 h, (lights on at 13:00 h), and maintained the significant delay in the onset of activity at lights out. In continuous darkness, the animals were exposed to a light pulse at circadian time 23. This resulted in a significant decrease of photo-stimulated neurons (immunoreactivity to c-Fos) in the SCN of the metal-exposed animals. These results show that chronic early Pb exposure alters the photic entrainment of the rhythm of locomotor activity, which is evidenced by a significant decrease in both the number of photo-stimulated neurons and neuronal population (Nissl stain) of the SCN.
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172
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Hussain A, Gopalakrishnan A, Muthuvel B, Hussaindeen JR, Narayanasamy A, Sivaraman V. Young adults with myopia have lower concentrations of neuromodulators-dopamine and melatonin in serum and tear. Exp Eye Res 2021; 209:108684. [PMID: 34175263 DOI: 10.1016/j.exer.2021.108684] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 06/17/2021] [Accepted: 06/21/2021] [Indexed: 11/24/2022]
Abstract
The purpose of this experimental case-control study was to explore the association between myopia and concentration of dopamine and melatonin in serum and tear fluid among young myopic adults, compared to age matched non-myopic controls. Healthy myopic adults with Spherical equivalent refraction (SER) of ≤ -0.50 D to -6.00 D and emmetropic adults were included in the study. All participants underwent comprehensive eye examination and ocular biometric measures that included-axial length and corneal radii. Insomnia symptom questionnaire (ISQ) was used to screen the symptoms associated with the diagnostic criteria for primary insomnia. Morning serum and tear concentration of dopamine and melatonin were collected and was quantified using High performance liquid chromatography. A total number of 40 participants, 21 myopes and 19 controls, with a median (IQR) age of myopes 24 [21-34] years and controls 24 [20-29] years were studied. The Median [IQR] of SER was -2.00[-6.25-(-0.50)] D and 0 [(-0.50)-0.25] D for myopes and controls respectively. Myopes were found to have significantly lower concentration of serum dopamine (Median [IQR]) 190 [50-342] ng/mL compared to controls (Median [IQR]) 411 [84-717] ng/mL (U = 88, p < 0.002). Likewise, myopes showed significantly lower serum melatonin concentration of 40 [20-169] ng/mL compared to controls 203 [22-539] ng/mL (U = 88.50, p < 0.001). Myopes exhibited lower concentration of tear dopamine 101 [8-188] ng/mL compared to controls 136 [25-451] ng/mL (U = 103, p < 0.05). Likewise, myopes showed significantly lower tear melatonin concentration 6 [2-18] ng/mL compared to controls 9 [2-23] ng/mL (U = 104, p < 0.05). Both serum dopamine (r = 0.419, p < 0.05) and melatonin (r = 0.323, p < 0.05) showed significant positive association with increase in spherical equivalent refraction (SER). The observed changes in the decreased concentration of Dopamine and Melatonin among young adult myopes and its association with refraction indicates the role of altered circadian rhythm in the human myopia mechanism.
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Affiliation(s)
- Azfira Hussain
- Myopia Clinic, Sankara Nethralaya, Unit of Medical Research Foundation, Chennai, India
| | - Aparna Gopalakrishnan
- Myopia Clinic, Sankara Nethralaya, Unit of Medical Research Foundation, Chennai, India; Faculty of Health, School of Medicine, Deakin University, Australia
| | - Bharathselvi Muthuvel
- R.S.Mehta Jain Department of Biochemistry and Cell Biology, Vision Research Foundation, Sankara Nethralaya, Chennai, India
| | | | - Angayarkanni Narayanasamy
- R.S.Mehta Jain Department of Biochemistry and Cell Biology, Vision Research Foundation, Sankara Nethralaya, Chennai, India
| | - Viswanathan Sivaraman
- Myopia Clinic, Sankara Nethralaya, Unit of Medical Research Foundation, Chennai, India.
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173
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Hughes ATL, Samuels RE, Baño-Otálora B, Belle MDC, Wegner S, Guilding C, Northeast RC, Loudon ASI, Gigg J, Piggins HD. Timed daily exercise remodels circadian rhythms in mice. Commun Biol 2021; 4:761. [PMID: 34145388 PMCID: PMC8213798 DOI: 10.1038/s42003-021-02239-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 05/18/2021] [Indexed: 01/26/2023] Open
Abstract
Regular exercise is important for physical and mental health. An underexplored and intriguing property of exercise is its actions on the body’s 24 h or circadian rhythms. Molecular clock cells in the brain’s suprachiasmatic nuclei (SCN) use electrical and chemical signals to orchestrate their activity and convey time of day information to the rest of the brain and body. To date, the long-lasting effects of regular physical exercise on SCN clock cell coordination and communication remain unresolved. Utilizing mouse models in which SCN intercellular neuropeptide signaling is impaired as well as those with intact SCN neurochemical signaling, we examined how daily scheduled voluntary exercise (SVE) influenced behavioral rhythms and SCN molecular and neuronal activities. We show that in mice with disrupted neuropeptide signaling, SVE promotes SCN clock cell synchrony and robust 24 h rhythms in behavior. Interestingly, in both intact and neuropeptide signaling deficient animals, SVE reduces SCN neural activity and alters GABAergic signaling. These findings illustrate the potential utility of regular exercise as a long-lasting and effective non-invasive intervention in the elderly or mentally ill where circadian rhythms can be blunted and poorly aligned to the external world. Using mice with disrupted neuropeptide signaling, Hughes et al. show that daily scheduled voluntary exercise (SVE) promotes suprachiasmatic nuclei (SCN) clock cell synchrony and robust 24 h rhythms in behavior. This study suggests the potential utility of regular exercise as a non-invasive intervention for the elderly or mentally ill, where circadian rhythms can be poorly aligned to the external world.
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Affiliation(s)
- Alun Thomas Lloyd Hughes
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK.,School of Biological and Environmental Sciences, Liverpool John Moores University, Liverpool, UK
| | - Rayna Eve Samuels
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK
| | - Beatriz Baño-Otálora
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK
| | - Mino David Charles Belle
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK.,University of Exeter Medical School, Exeter, UK
| | - Sven Wegner
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK
| | - Clare Guilding
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK.,School of Medical Education, Newcastle University, Newcastle, UK
| | | | | | - John Gigg
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK
| | - Hugh David Piggins
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK. .,School of Physiology, Pharmacology, and Neuroscience, University of Bristol, Bristol, UK.
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174
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Milanti A, Chan DNS, Li C, So WKW. Actigraphy-measured rest-activity circadian rhythm disruption in patients with advanced cancer: a scoping review. Support Care Cancer 2021; 29:7145-7169. [PMID: 34142279 DOI: 10.1007/s00520-021-06317-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 05/25/2021] [Indexed: 01/20/2023]
Abstract
PURPOSE Patients with later-stage cancer have been reported to demonstrate more disrupted rest-activity circadian rhythms (RACR) than those with earlier-stage cancer, but consolidated evidence of this is lacking. The aim of this review was to examine and map the existing evidence on actigraphy-measured RACR in terms of their (1) pattern, (2) prevalence, (3) related factors, and (4) outcomes in advanced cancer patients. METHODS A comprehensive scoping review was conducted using Arksey and O'Malley's framework. A literature search was performed using nine databases: MEDLINE, Embase, PsycINFO, CINAHL, British Nursing Index, Cochrane Library, Scopus, Web of Science, and SINTA. RESULTS Twenty-one studies were included in the review. Compared with the healthy population, advanced cancer patients were more likely to display weaker RACR, manifesting as lower activity levels during the day, more frequent and longer daytime naps, and fragmented nighttime sleep. The prevalence of RACR disruption among advanced cancer patients ranged from 31.3 to 54.9%. It was found to be linked to the presence of physical and psychological symptoms (fatigue, appetite loss, pain, dyspnoea, sleep disturbance, depression, and anxiety), chemotherapy, male sex, and also predict the lower quality of life and survival. CONCLUSION Disruption of the RACR is prevalent in advanced cancer patients and is associated with a set of physical and psychological symptoms. It was also found to be a predictor of the quality of life and survival among these patients. These results indicate the importance of interventions to restabilise the disrupted RACR among advance cancer patients to improve their health outcomes.
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Affiliation(s)
- Ariesta Milanti
- The Nethersole School of Nursing, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
| | - Dorothy N S Chan
- The Nethersole School of Nursing, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
| | - Caixia Li
- The Nethersole School of Nursing, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
| | - Winnie K W So
- The Nethersole School of Nursing, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
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175
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Koritala BSC, Conroy Z, Smith DF. Circadian Biology in Obstructive Sleep Apnea. Diagnostics (Basel) 2021; 11:1082. [PMID: 34199193 PMCID: PMC8231795 DOI: 10.3390/diagnostics11061082] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 06/09/2021] [Accepted: 06/10/2021] [Indexed: 11/16/2022] Open
Abstract
Obstructive sleep apnea (OSA) is a complex process that can lead to the dysregulation of the molecular clock, as well as 24 h rhythms of sleep and wake, blood pressure, and other associated biological processes. Previous work has demonstrated crosstalk between the circadian clock and hypoxia-responsive pathways. However, even in the absence of OSA, disrupted clocks can exacerbate OSA-associated outcomes (e.g., cardiovascular or cognitive outcomes). As we expand our understanding of circadian biology in the setting of OSA, this information could play a significant role in the diagnosis and treatment of OSA. Here, we summarize the pre-existing knowledge of circadian biology in patients with OSA and examine the utility of circadian biomarkers as alternative clinical tools.
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Affiliation(s)
- Bala S. C. Koritala
- Division of Pediatric Otolaryngology-Head and Neck Surgery, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA;
| | - Zachary Conroy
- College of Medicine, University of Cincinnati, Cincinnati, OH 45267, USA;
| | - David F. Smith
- Division of Pediatric Otolaryngology-Head and Neck Surgery, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA;
- Department of Otolaryngology-Head and Neck Surgery, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
- Division of Pulmonary Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA
- The Sleep Center, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA
- The Center for Circadian Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA
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176
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Oliveira GF, Marin TC, Apolinário N, Rosa-Silva J, Azevêdo L, Ceciliato J, Silva-Batista C, Brito LC. Association of morningness-eveningness preference with physical activity during the COVID-19 pandemic social distancing: a cross-sectional survey in Brazil. Chronobiol Int 2021; 38:1432-1440. [PMID: 34034607 DOI: 10.1080/07420528.2021.1931276] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Social distancing (SDIST) to contain COVID-19 pandemic spread implies reduced sunlight exposure and social daily life, which delay the circadian system and increase eveningness preference. The regular practice of physical activity (PA) is a time cue that decreased during SDIST. However, it is unknown if decreased PA may be associated with increase of eveningness preference. This study aimed to investigate if PA changes might be associated with changes in the morningness-eveningness preference of individuals practicing SDIST in Brazil. For this, 322 adults (18-89 years-old) regularly living in Brazil between March and October 2020 answered an online survey including questions considering the before and during SDIST period on PA (min/week) and morningness-eveningness questionnaire score. Sociodemographic, SDIST, anthropometric, and health characteristics were also included in the online survey. Participants self-reported an increase of eveningness preference comparing Before-SDIST with During-SDIST scores (56 ± 12 vs. 52 ± 13, p < .0001). Self-reported PA decreased comparing Before-SDIST with During-SDIST (230 ± 170 vs. 149 ± 155 min/week, p < .0001). Decrease in the total volume of PA and hours spent outside per day, and higher body mass index were associated with the increase in eveningness preference (R2 = .077), although the decrease in the total volume of PA was the strongest association (R2 = .037). In summary, our results show that SDIST may cause a delay in the circadian system, which is associated with the decrease of PA, a reduction in the hours spent outside per day with sunlight exposure, and obesity.
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Affiliation(s)
- Gustavo F Oliveira
- School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil.,Applied Chronobiology & Exercise Physiology Research Group, University of São Paulo, São Paulo, Brazil
| | - Thais C Marin
- School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil.,Applied Chronobiology & Exercise Physiology Research Group, University of São Paulo, São Paulo, Brazil
| | - Nicolas Apolinário
- School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil.,Applied Chronobiology & Exercise Physiology Research Group, University of São Paulo, São Paulo, Brazil
| | - Julia Rosa-Silva
- Applied Chronobiology & Exercise Physiology Research Group, University of São Paulo, São Paulo, Brazil.,Exercise Hemodynamic Laboratory, University of São Paulo, São Paulo, Brazil
| | - Luan Azevêdo
- Exercise Hemodynamic Laboratory, University of São Paulo, São Paulo, Brazil
| | - Julio Ceciliato
- School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil.,Applied Chronobiology & Exercise Physiology Research Group, University of São Paulo, São Paulo, Brazil
| | - Carla Silva-Batista
- School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil.,Exercise Neuroscience Research Group, University of São Paulo, São Paulo, Brazil
| | - Leandro C Brito
- School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil.,Applied Chronobiology & Exercise Physiology Research Group, University of São Paulo, São Paulo, Brazil.,Exercise Hemodynamic Laboratory, University of São Paulo, São Paulo, Brazil
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177
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Murray JM, Magee M, Sletten TL, Gordon C, Lovato N, Ambani K, Bartlett DJ, Kennaway DJ, Lack LC, Grunstein RR, Lockley SW, Rajaratnam SMW, Phillips AJK. Light-based methods for predicting circadian phase in delayed sleep-wake phase disorder. Sci Rep 2021; 11:10878. [PMID: 34035333 PMCID: PMC8149449 DOI: 10.1038/s41598-021-89924-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 04/13/2021] [Indexed: 02/04/2023] Open
Abstract
Methods for predicting circadian phase have been developed for healthy individuals. It is unknown whether these methods generalize to clinical populations, such as delayed sleep-wake phase disorder (DSWPD), where circadian timing is associated with functional outcomes. This study evaluated two methods for predicting dim light melatonin onset (DLMO) in 154 DSWPD patients using ~ 7 days of sleep-wake and light data: a dynamic model and a statistical model. The dynamic model has been validated in healthy individuals under both laboratory and field conditions. The statistical model was developed for this dataset and used a multiple linear regression of light exposure during phase delay/advance portions of the phase response curve, as well as sleep timing and demographic variables. Both models performed comparably well in predicting DLMO. The dynamic model predicted DLMO with root mean square error of 68 min, with predictions accurate to within ± 1 h in 58% of participants and ± 2 h in 95%. The statistical model predicted DLMO with root mean square error of 57 min, with predictions accurate to within ± 1 h in 75% of participants and ± 2 h in 96%. We conclude that circadian phase prediction from light data is a viable technique for improving screening, diagnosis, and treatment of DSWPD.
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Affiliation(s)
- Jade M. Murray
- grid.1002.30000 0004 1936 7857Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, 18 Innovation Walk, Clayton, VIC 3800 Australia ,Cooperative Research Centre for Alertness, Safety and Productivity, Clayton, VIC Australia ,NHMRC Centre for Sleep and Circadian Neurobiology, Sydney, NSW Australia
| | - Michelle Magee
- grid.1002.30000 0004 1936 7857Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, 18 Innovation Walk, Clayton, VIC 3800 Australia ,Cooperative Research Centre for Alertness, Safety and Productivity, Clayton, VIC Australia ,NHMRC Centre for Sleep and Circadian Neurobiology, Sydney, NSW Australia ,grid.1008.90000 0001 2179 088XCentre for Neuroscience of Speech, Department of Audiology and Speech Pathology, University of Melbourne, Melbourne, VIC Australia
| | - Tracey L. Sletten
- grid.1002.30000 0004 1936 7857Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, 18 Innovation Walk, Clayton, VIC 3800 Australia ,Cooperative Research Centre for Alertness, Safety and Productivity, Clayton, VIC Australia ,NHMRC Centre for Sleep and Circadian Neurobiology, Sydney, NSW Australia
| | - Christopher Gordon
- Cooperative Research Centre for Alertness, Safety and Productivity, Clayton, VIC Australia ,NHMRC Centre for Sleep and Circadian Neurobiology, Sydney, NSW Australia ,grid.417229.b0000 0000 8945 8472Woolcock Institute of Medical Research and Sydney Local Health District, Sydney, NSW Australia ,grid.1013.30000 0004 1936 834XUniversity of Sydney Susan Wakil School of Nursing, Camperdown, NSW Australia
| | - Nicole Lovato
- Cooperative Research Centre for Alertness, Safety and Productivity, Clayton, VIC Australia ,grid.1014.40000 0004 0367 2697Adelaide Institute for Sleep Health, College of Medicine and Public Health, Flinders University, Adelaide, SA Australia
| | - Krutika Ambani
- grid.1002.30000 0004 1936 7857Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, 18 Innovation Walk, Clayton, VIC 3800 Australia
| | - Delwyn J. Bartlett
- Cooperative Research Centre for Alertness, Safety and Productivity, Clayton, VIC Australia ,NHMRC Centre for Sleep and Circadian Neurobiology, Sydney, NSW Australia ,grid.417229.b0000 0000 8945 8472Woolcock Institute of Medical Research and Sydney Local Health District, Sydney, NSW Australia
| | - David J. Kennaway
- grid.1010.00000 0004 1936 7304Robinson Research Institute and School of Medicine, University of Adelaide, Adelaide, SA Australia
| | - Leon C. Lack
- Cooperative Research Centre for Alertness, Safety and Productivity, Clayton, VIC Australia ,grid.1014.40000 0004 0367 2697Adelaide Institute for Sleep Health, College of Medicine and Public Health, Flinders University, Adelaide, SA Australia
| | - Ronald R. Grunstein
- Cooperative Research Centre for Alertness, Safety and Productivity, Clayton, VIC Australia ,NHMRC Centre for Sleep and Circadian Neurobiology, Sydney, NSW Australia ,grid.417229.b0000 0000 8945 8472Woolcock Institute of Medical Research and Sydney Local Health District, Sydney, NSW Australia
| | - Steven W. Lockley
- grid.1002.30000 0004 1936 7857Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, 18 Innovation Walk, Clayton, VIC 3800 Australia ,Cooperative Research Centre for Alertness, Safety and Productivity, Clayton, VIC Australia ,NHMRC Centre for Sleep and Circadian Neurobiology, Sydney, NSW Australia ,grid.62560.370000 0004 0378 8294Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women’s Hospital, Boston, MA USA ,grid.38142.3c000000041936754XDivision of Sleep Medicine, Harvard Medical School, Boston, MA USA
| | - Shantha M. W. Rajaratnam
- grid.1002.30000 0004 1936 7857Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, 18 Innovation Walk, Clayton, VIC 3800 Australia ,Cooperative Research Centre for Alertness, Safety and Productivity, Clayton, VIC Australia ,NHMRC Centre for Sleep and Circadian Neurobiology, Sydney, NSW Australia ,grid.62560.370000 0004 0378 8294Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women’s Hospital, Boston, MA USA ,grid.38142.3c000000041936754XDivision of Sleep Medicine, Harvard Medical School, Boston, MA USA
| | - Andrew J. K. Phillips
- grid.1002.30000 0004 1936 7857Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, 18 Innovation Walk, Clayton, VIC 3800 Australia ,Cooperative Research Centre for Alertness, Safety and Productivity, Clayton, VIC Australia
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178
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Hannibal J. Comparative Neurology of Circadian Photoreception: The Retinohypothalamic Tract (RHT) in Sighted and Naturally Blind Mammals. Front Neurosci 2021; 15:640113. [PMID: 34054403 PMCID: PMC8160255 DOI: 10.3389/fnins.2021.640113] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 03/29/2021] [Indexed: 11/13/2022] Open
Abstract
The mammalian eye contains two systems for light perception: an image detecting system constituted primarily of the classical photoreceptors, rods and cones, and a non-image forming system (NIF) constituted of a small group of intrinsically photosensitive retinal ganglion cells driven by melanopsin (mRGCs). The mRGCs receive input from the outer retina and NIF mediates light entrainment of circadian rhythms, masking behavior, light induced inhibition of nocturnal melatonin secretion, pupillary reflex (PLR), and affect the sleep/wake cycle. This review focuses on the mammalian NIF and its anatomy in the eye as well as its neuronal projection to the brain. This pathway is known as the retinohypothalamic tract (RHT). The development and functions of the NIF as well as the knowledge gained from studying gene modified mice is highlighted. Furthermore, the similarities of the NIF between sighted (nocturnal and diurnal rodent species, monkeys, humans) and naturally blind mammals (blind mole rats Spalax ehrenbergi and the Iberian mole, Talpa occidentalis) are discussed in relation to a changing world where increasing exposure to artificial light at night (ALAN) is becoming a challenge for humans and animals in the modern society.
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Affiliation(s)
- Jens Hannibal
- Department of Clinical Biochemistry, Bispebjerg Frederiksberg Hospital, University of Copenhagen, Copenhagen, Denmark
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179
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Falck RS, Davis JC, Best JR, Chan PCY, Li LC, Wyrough AB, Bennett KJ, Backhouse D, Liu-Ambrose T. Effect of a Multimodal Lifestyle Intervention on Sleep and Cognitive Function in Older Adults with Probable Mild Cognitive Impairment and Poor Sleep: A Randomized Clinical Trial. J Alzheimers Dis 2021; 76:179-193. [PMID: 32444553 DOI: 10.3233/jad-200383] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Poor sleep is common among older adults with mild cognitive impairment (MCI) and may contribute to further cognitive decline. Whether multimodal lifestyle intervention that combines bright light therapy (BLT), physical activity (PA), and good sleep hygiene can improve sleep in older adults with MCI and poor sleep is unknown. OBJECTIVE To assess the effect of a multimodal lifestyle intervention on sleep in older adults with probable MCI and poor sleep. METHODS This was a 24-week proof-of-concept randomized trial of 96 community-dwelling older adults aged 65-85 years with probable MCI (<26/30 on the Montreal Cognitive Assessment) and poor sleep (>5 on the Pittsburgh Sleep Quality Index [PSQI]). Participants were allocated to either a multimodal lifestyle intervention (INT); or 2) education + attentional control (CON). INT participants received four once-weekly general sleep hygiene education classes, followed by 20-weeks of: 1) individually-timed BLT; and 2) individually-tailored PA promotion. Our primary outcome was sleep efficiency measured using the MotionWatch8© (MW8). Secondary outcomes were MW8-measured sleep duration, fragmentation index, wake-after-sleep-onset, latency, and PSQI-measured subjective sleep quality. RESULTS There were no significant between-group differences in MW8 measured sleep efficiency at 24-weeks (estimated mean difference [INT -CON]: 1.18%; 95% CI [-0.99, 3.34]), or any other objective-estimate of sleep. However, INT participants reported significantly better subjective sleep quality at 24-weeks (estimated mean difference: -1.39; 95% CI [-2.72, -0.06]) compared to CON. CONCLUSION Among individuals with probable MCI and poor sleep, a multimodal lifestyle intervention improves subjective sleep quality, but not objectively estimated sleep.
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Affiliation(s)
- Ryan S Falck
- Aging, Mobility, and Cognitive Neuroscience Lab, Department of Physical Therapy, University of British Columbia, Vancouver, British Columbia, Canada.,Djavad Mowafaghian Centre for Brain Health, Vancouver Coastal Health Research Institute. University of British Columbia, Vancouver, British Columbia, Canada.,Centre for Hip Health and Mobility, Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Jennifer C Davis
- Faculty of Management, University of British Columbia-Okanagan Campus, Kelowna, British Columbia, Canada
| | - John R Best
- Aging, Mobility, and Cognitive Neuroscience Lab, Department of Physical Therapy, University of British Columbia, Vancouver, British Columbia, Canada.,Djavad Mowafaghian Centre for Brain Health, Vancouver Coastal Health Research Institute. University of British Columbia, Vancouver, British Columbia, Canada.,Centre for Hip Health and Mobility, Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Patrick C Y Chan
- Aging, Mobility, and Cognitive Neuroscience Lab, Department of Physical Therapy, University of British Columbia, Vancouver, British Columbia, Canada.,Djavad Mowafaghian Centre for Brain Health, Vancouver Coastal Health Research Institute. University of British Columbia, Vancouver, British Columbia, Canada.,Centre for Hip Health and Mobility, Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Linda C Li
- Arthritis Research Canada, University of British Columbia, Vancouver, British Columbia, Canada
| | - Anne B Wyrough
- Aging, Mobility, and Cognitive Neuroscience Lab, Department of Physical Therapy, University of British Columbia, Vancouver, British Columbia, Canada.,Djavad Mowafaghian Centre for Brain Health, Vancouver Coastal Health Research Institute. University of British Columbia, Vancouver, British Columbia, Canada.,Centre for Hip Health and Mobility, Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Kimberly J Bennett
- Aging, Mobility, and Cognitive Neuroscience Lab, Department of Physical Therapy, University of British Columbia, Vancouver, British Columbia, Canada.,Djavad Mowafaghian Centre for Brain Health, Vancouver Coastal Health Research Institute. University of British Columbia, Vancouver, British Columbia, Canada.,Centre for Hip Health and Mobility, Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Daniel Backhouse
- Aging, Mobility, and Cognitive Neuroscience Lab, Department of Physical Therapy, University of British Columbia, Vancouver, British Columbia, Canada.,Djavad Mowafaghian Centre for Brain Health, Vancouver Coastal Health Research Institute. University of British Columbia, Vancouver, British Columbia, Canada.,Centre for Hip Health and Mobility, Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Teresa Liu-Ambrose
- Aging, Mobility, and Cognitive Neuroscience Lab, Department of Physical Therapy, University of British Columbia, Vancouver, British Columbia, Canada.,Djavad Mowafaghian Centre for Brain Health, Vancouver Coastal Health Research Institute. University of British Columbia, Vancouver, British Columbia, Canada.,Centre for Hip Health and Mobility, Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
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180
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Lassi M, Tomar A, Comas-Armangué G, Vogtmann R, Dijkstra DJ, Corujo D, Gerlini R, Darr J, Scheid F, Rozman J, Aguilar-Pimentel A, Koren O, Buschbeck M, Fuchs H, Marschall S, Gailus-Durner V, Hrabe de Angelis M, Plösch T, Gellhaus A, Teperino R. Disruption of paternal circadian rhythm affects metabolic health in male offspring via nongerm cell factors. SCIENCE ADVANCES 2021; 7:7/22/eabg6424. [PMID: 34039610 PMCID: PMC8153725 DOI: 10.1126/sciadv.abg6424] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 04/02/2021] [Indexed: 06/12/2023]
Abstract
Circadian rhythm synchronizes each body function with the environment and regulates physiology. Disruption of normal circadian rhythm alters organismal physiology and increases disease risk. Recent epidemiological data and studies in model organisms have shown that maternal circadian disruption is important for offspring health and adult phenotypes. Less is known about the role of paternal circadian rhythm for offspring health. Here, we disrupted circadian rhythm in male mice by night-restricted feeding and showed that paternal circadian disruption at conception is important for offspring feeding behavior, metabolic health, and oscillatory transcription. Mechanistically, our data suggest that the effect of paternal circadian disruption is not transferred to the offspring via the germ cells but initiated by corticosterone-based parental communication at conception and programmed during in utero development through a state of fetal growth restriction. These findings indicate paternal circadian health at conception as a newly identified determinant of offspring phenotypes.
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Affiliation(s)
- Maximilian Lassi
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
| | - Archana Tomar
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
| | - Gemma Comas-Armangué
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
| | - Rebekka Vogtmann
- Department of Gynecology and Obstetrics-University Hospital Essen - Essen, Germany
| | - Dorieke J Dijkstra
- University of Groningen, University Medical Center Groningen, Department of Obstetrics and Gynecology, Groningen, Netherlands
| | - David Corujo
- Cancer and Leukemia Epigenetics and Biology Program, Josep Carreras Institute for Leukemia Research (IJC) Badalona, Spain
| | - Raffaele Gerlini
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
| | - Jonatan Darr
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
| | - Fabienne Scheid
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
| | - Jan Rozman
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50, Vestec, Czech Republic
| | - Antonio Aguilar-Pimentel
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
| | - Omry Koren
- Azrieli Faculty of Medicine, Bar Ilan University, Safed, Israel
| | - Marcus Buschbeck
- Cancer and Leukemia Epigenetics and Biology Program, Josep Carreras Institute for Leukemia Research (IJC) Badalona, Spain
- Program for Predictive and Personalized Medicine of Cancer, Germans Trias i Pujol Research Institute (PMPPC-IGTP), 08916 Badalona, Spain
| | - Helmut Fuchs
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
| | - Susan Marschall
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
| | - Valerie Gailus-Durner
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
| | - Martin Hrabe de Angelis
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- German Center for Diabetes Research (DZD) Neuherberg, Germany
- German Mouse Clinic, Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany
- Chair of Experimental Genetics, School of Life Science Weihenstephan, Technische Universität München Freising, Germany
| | - Torsten Plösch
- University of Groningen, University Medical Center Groningen, Department of Obstetrics and Gynecology, Groningen, Netherlands
| | - Alexandra Gellhaus
- Department of Gynecology and Obstetrics-University Hospital Essen - Essen, Germany
| | - Raffaele Teperino
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health Neuherberg, Germany.
- German Center for Diabetes Research (DZD) Neuherberg, Germany
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181
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Kawakami N, Otubo A, Maejima S, Talukder AH, Satoh K, Oti T, Takanami K, Ueda Y, Itoi K, Morris JF, Sakamoto T, Sakamoto H. Variation of pro-vasopressin processing in parvocellular and magnocellular neurons in the paraventricular nucleus of the hypothalamus: Evidence from the vasopressin-related glycopeptide copeptin. J Comp Neurol 2021; 529:1372-1390. [PMID: 32892351 DOI: 10.1002/cne.25026] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 08/31/2020] [Accepted: 09/01/2020] [Indexed: 11/05/2022]
Abstract
Arginine vasopressin (AVP) is synthesized in parvocellular- and magnocellular neuroendocrine neurons in the paraventricular nucleus (PVN) of the hypothalamus. Whereas magnocellular AVP neurons project primarily to the posterior pituitary, parvocellular AVP neurons project to the median eminence (ME) and to extrahypothalamic areas. The AVP gene encodes pre-pro-AVP that comprises the signal peptide, AVP, neurophysin (NPII), and a copeptin glycopeptide. In the present study, we used an N-terminal copeptin antiserum to examine copeptin expression in magnocellular and parvocellular neurons in the hypothalamus in the mouse, rat, and macaque monkey. Although magnocellular NPII-expressing neurons exhibited strong N-terminal copeptin immunoreactivity in all three species, a great majority (~90%) of parvocellular neurons that expressed NPII was devoid of copeptin immunoreactivity in the mouse, and in approximately half (~53%) of them in the rat, whereas in monkey hypothalamus, virtually all NPII-immunoreactive parvocellular neurons contained strong copeptin immunoreactivity. Immunoelectron microscopy in the mouse clearly showed copeptin-immunoreactivity co-localized with NPII-immunoreactivity in neurosecretory vesicles in the internal layer of the ME and posterior pituitary, but not in the external layer of the ME. Intracerebroventricular administration of a prohormone convertase inhibitor, hexa-d-arginine amide resulted in a marked reduction of copeptin-immunoreactivity in the NPII-immunoreactive magnocellular PVN neurons in the mouse, suggesting that low protease activity and incomplete processing of pro-AVP could explain the disproportionally low levels of N-terminal copeptin expression in rodent AVP (NPII)-expressing parvocellular neurons. Physiologic and phylogenetic aspects of copeptin expression among neuroendocrine neurons require further exploration.
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Affiliation(s)
- Natsuko Kawakami
- Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan.,Department of Biology, Faculty of Science, Okayama University, Okayama, Japan.,Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, UK
| | - Akito Otubo
- Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan
| | - Sho Maejima
- Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan
| | - Ashraf H Talukder
- Laboratory of Information Biology, Graduate School of Information Sciences, Tohoku University, Sendai, Miyagi, Japan
| | - Keita Satoh
- Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan.,Department of Anatomy, Kawasaki Medical School, Okayama, Japan
| | - Takumi Oti
- Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan.,Department of Biological Sciences, Faculty of Science, Kanagawa University, Hiratsuka, Kanagawa, Japan
| | - Keiko Takanami
- Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan.,Mouse Genomics Resources Laboratory, National Institute of Genetics, Shizuoka, Japan
| | - Yasumasa Ueda
- Department of Physiology, Kyoto Prefectural University of Medicine, Kyoto, Japan.,Department of Physiology, Kansai Medical University, Osaka, Japan
| | - Keiichi Itoi
- Laboratory of Information Biology, Graduate School of Information Sciences, Tohoku University, Sendai, Miyagi, Japan
| | - John F Morris
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, UK
| | - Tatsuya Sakamoto
- Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan
| | - Hirotaka Sakamoto
- Ushimado Marine Institute (UMI), Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan.,Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, UK
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182
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de Assis LVM, Oster H. The circadian clock and metabolic homeostasis: entangled networks. Cell Mol Life Sci 2021; 78:4563-4587. [PMID: 33683376 PMCID: PMC8195959 DOI: 10.1007/s00018-021-03800-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 01/28/2021] [Accepted: 02/23/2021] [Indexed: 12/12/2022]
Abstract
The circadian clock exerts an important role in systemic homeostasis as it acts a keeper of time for the organism. The synchrony between the daily challenges imposed by the environment needs to be aligned with biological processes and with the internal circadian clock. In this review, it is provided an in-depth view of the molecular functioning of the circadian molecular clock, how this system is organized, and how central and peripheral clocks communicate with each other. In this sense, we provide an overview of the neuro-hormonal factors controlled by the central clock and how they affect peripheral tissues. We also evaluate signals released by peripheral organs and their effects in the central clock and other brain areas. Additionally, we evaluate a possible communication between peripheral tissues as a novel layer of circadian organization by reviewing recent studies in the literature. In the last section, we analyze how the circadian clock can modulate intracellular and tissue-dependent processes of metabolic organs. Taken altogether, the goal of this review is to provide a systemic and integrative view of the molecular clock function and organization with an emphasis in metabolic tissues.
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Affiliation(s)
| | - Henrik Oster
- Center of Brain, Behavior and Metabolism, University of Lübeck, Institute of Neurobiology, Marie Curie Street, 23562, Lübeck, Germany.
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183
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Gubin D, Neroev V, Malishevskaya T, Cornelissen G, Astakhov SY, Kolomeichuk S, Yuzhakova N, Kabitskaya Y, Weinert D. Melatonin mitigates disrupted circadian rhythms, lowers intraocular pressure, and improves retinal ganglion cells function in glaucoma. J Pineal Res 2021; 70:e12730. [PMID: 33730443 DOI: 10.1111/jpi.12730] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 03/11/2021] [Accepted: 03/12/2021] [Indexed: 02/06/2023]
Abstract
Glaucoma is a progressive optic neuropathy associated with damage to retinal ganglion cells (RGCs) and disrupted circadian rhythms. Melatonin is a promising substance to ameliorate glaucoma-associated compromised circadian rhythms, sleep, mood, and retinal cells function. However, studies estimating melatonin effects in glaucoma are currently lacking. Therefore, In this study, we investigated the effect of long-term (daily at 10:30 pm for 90 days) oral melatonin administration on systemic (Tb) and local to the organ of vision (IOP) circadian rhythms, pattern electroretinogram (PERG), sleep, and mood, depending on glaucoma stage in patients diagnosed with stable or advanced primary open-angle glaucoma. In a laboratory study in 15 of them, 24-hour records of salivary melatonin were obtained and MTNR1B receptor gene polymorphism was assessed. Melatonin increased the stability of the Tb circadian rhythm by improving its phase alignment and alignment with IOP. Melatonin time-dependently decreased IOP and IOP standard deviation (SD). IOP 24-hour mean and IOP SD decreases were more pronounced in individuals with the higher initial 24-hour IOP mean. Melatonin improved RGCs function in advanced glaucoma; N95 amplitude increase correlated positively with RGCs loss. The beneficial effects of melatonin on sleep and mood were greater in advanced glaucoma. Finally, delayed salivary melatonin and Tb phases were observed in MTNR1B G-allele carriers with advanced glaucoma. Combined, these results provide evidence for melatonin efficiency in restoring disrupted circadian rhythms in glaucoma with different effects of melatonin on systemic vs. local circadian rhythms, indicating that a personalized strategy of melatonin administration may further refine its treatment benefits.
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Affiliation(s)
- Denis Gubin
- Department of Biology, Medical University, Tyumen, Russia
- Tyumen Cardiology Research Center, Tomsk National Research Medical Center, Russian Academy of Science, Tomsk, Russia
| | - Vladimir Neroev
- Helmholtz Moscow Research Institute of Eye Diseases, Moscow, Russia
| | | | - Germaine Cornelissen
- Department of Integrated Biology and Physiology, University of Minnesota, Minneapolis, MN, USA
| | - Sergei Y Astakhov
- Pavlov First Saint Petersburg State Medical University, St. Petersburg, Russia
| | - Sergey Kolomeichuk
- Laboratory of Genetics, Institute of Biology of the Karelian Science Center of the Russian Academy of Sciences, Petrozavodsk, Russia
| | | | - Yana Kabitskaya
- Center for Genomic Technologies, Northern Trans-Ural State Agricultural University, Tyumen, Russia
| | - Dietmar Weinert
- Institute of Biology/Zoology, Martin Luther University, Halle-Wittenberg, Germany
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184
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The Nexus Between Sleep Disturbance and Delirium Among Intensive Care Patients. Crit Care Nurs Clin North Am 2021; 33:155-171. [PMID: 34023083 DOI: 10.1016/j.cnc.2021.01.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Sleep in intensive care is hampered due to many factors; the clinical environment itself exacerbates sleep disturbance. Research suggests that interventions aimed at improving sleep quality have produced positive effects in reducing incidences and duration of delirium. Sleep disturbance is well documented among intensive care patients; however, its prognostic impact is not fully understood. Delirium, disproportionally prevalent among intensive care patients, has significant prognostic factors related to patient outcomes, in which sleep disturbance often is present. The relationship between sleep disturbance and delirium is complex, sharing commonalities in relation to neurobiological and neurohormonal alterations, which may contribute to a bidirectional relationship.
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185
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Redox and Antioxidant Modulation of Circadian Rhythms: Effects of Nitroxyl, N-Acetylcysteine and Glutathione. Molecules 2021; 26:molecules26092514. [PMID: 33925826 PMCID: PMC8123468 DOI: 10.3390/molecules26092514] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Revised: 04/22/2021] [Accepted: 04/23/2021] [Indexed: 11/16/2022] Open
Abstract
The circadian clock at the hypothalamic suprachiasmatic nucleus (SCN) entrains output rhythms to 24-h light cycles. To entrain by phase-advances, light signaling at the end of subjective night (circadian time 18, CT18) requires free radical nitric oxide (NO•) binding to soluble guanylate cyclase (sGC) heme group, activating the cyclic guanosine monophosphate (cGMP)-dependent protein kinase (PKG). Phase-delays at CT14 seem to be independent of NO•, whose redox-related species were yet to be investigated. Here, the one-electron reduction of NO• nitroxyl was pharmacologically delivered by Angeli’s salt (AS) donor to assess its modulation on phase-resetting of locomotor rhythms in hamsters. Intracerebroventricular AS generated nitroxyl at the SCN, promoting phase-delays at CT14, but potentiated light-induced phase-advances at CT18. Glutathione/glutathione disulfide (GSH/GSSG) couple measured in SCN homogenates showed higher values at CT14 (i.e., more reduced) than at CT18 (oxidized). In addition, administration of antioxidants N-acetylcysteine (NAC) and GSH induced delays per se at CT14 but did not affect light-induced advances at CT18. Thus, the relative of NO• nitroxyl generates phase-delays in a reductive SCN environment, while an oxidative favors photic-advances. These data suggest that circadian phase-locking mechanisms should include redox SCN environment, generating relatives of NO•, as well as coupling with the molecular oscillator.
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186
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Panagiotou M, Michel S, Meijer JH, Deboer T. The aging brain: sleep, the circadian clock and exercise. Biochem Pharmacol 2021; 191:114563. [PMID: 33857490 DOI: 10.1016/j.bcp.2021.114563] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Revised: 04/06/2021] [Accepted: 04/07/2021] [Indexed: 12/26/2022]
Abstract
Aging is a multifactorial process likely stemming from damage accumulation and/or a decline in maintenance and repair mechanisms in the organisms that eventually determine their lifespan. In our review, we focus on the morphological and functional alterations that the aging brain undergoes affecting sleep and the circadian clock in both human and rodent models. Although both species share mammalian features, differences have been identified on several experimental levels, which we outline in this review. Additionally, we delineate some challenges on the preferred analysis and we suggest that a uniform route is followed so that findings can be smoothly compared. We conclude by discussing potential interventions and highlight the influence of physical exercise as a beneficial lifestyle intervention, and its effect on healthy aging and longevity. We emphasize that even moderate age-matched exercise is able to ameliorate several aging characteristics as far as sleep and circadian rhythms are concerned, independent of the species studied.
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Affiliation(s)
- M Panagiotou
- Laboratory for Neurophysiology, Department of Cell and Chemical Biology, Leiden University Medical Center, The Netherlands.
| | - S Michel
- Laboratory for Neurophysiology, Department of Cell and Chemical Biology, Leiden University Medical Center, The Netherlands
| | - J H Meijer
- Laboratory for Neurophysiology, Department of Cell and Chemical Biology, Leiden University Medical Center, The Netherlands
| | - T Deboer
- Laboratory for Neurophysiology, Department of Cell and Chemical Biology, Leiden University Medical Center, The Netherlands
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187
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Palesh O, Solomon N, Hofmeister E, Jo B, Shen H, Cassidy-Eagle E, Innominato PF, Mustian K, Kesler S. A novel approach to management of sleep-associated problems in patients with breast cancer (MOSAIC) during chemotherapy : A pilot study. Sleep 2021; 43:5818644. [PMID: 32274500 DOI: 10.1093/sleep/zsaa070] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 01/31/2020] [Indexed: 12/22/2022] Open
Abstract
STUDY OBJECTIVES This pilot randomized controlled trial (RCT) was conducted to assess the preliminary effects of Brief Behavioral Therapy for Cancer-Related Insomnia (BBT-CI) delivered by trained research staff in comparison to a sleep hygiene pamphlet control and to assess moderators of treatment effect in patients with breast cancer undergoing chemotherapy. METHODS Of 74 participants recruited, 37 were randomized to BBT-CI and 37 were randomized to the control condition. Trained staff members delivered the intervention during chemotherapy treatments to reduce patients' burden. Insomnia was assessed with the Insomnia Severity Index (ISI), anxiety was assessed with the Spielberger State-Trait Anxiety Inventory, symptom burden was assessed with the Symptom Inventory (SI), and study staff recorded previous treatments and surgeries received by patients. RESULTS Patients randomized to BBT-CI showed significantly greater improvements in their ISI scores compared to the sleep hygiene group. Additionally, several treatment moderators were identified. The effect of BBT-CI was greater among individuals with lower baseline state-trait anxiety, with previous surgery for cancer, and with higher baseline somatic symptom severity. CONCLUSIONS BBT-CI shows preliminary efficacy compared to the sleep hygiene handout on insomnia in cancer patients undergoing chemotherapy. A large-phase III RCT needs to be conducted to replicate the preliminary findings.
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Affiliation(s)
- Oxana Palesh
- Department of Psychiatry and Behavioral Sciences, Stanford School of Medicine, Stanford University, Stanford, CA
| | - Natalie Solomon
- PGSP Stanford Psy.D. Consortium, Palo Alto University, Palo Alto, CA
| | - Elisa Hofmeister
- Department of Psychiatry and Behavioral Sciences, Stanford School of Medicine, Stanford University, Stanford, CA
| | - Booil Jo
- Department of Psychiatry and Behavioral Sciences, Stanford School of Medicine, Stanford University, Stanford, CA
| | - Hanyang Shen
- Department of Psychiatry and Behavioral Sciences, Stanford School of Medicine, Stanford University, Stanford, CA
| | - Erin Cassidy-Eagle
- Department of Psychiatry and Behavioral Sciences, Stanford School of Medicine, Stanford University, Stanford, CA
| | - Pasquale F Innominato
- North Wales Cancer Centre, Ysbyty Gwynedd, Betsi Cadwaladr University Health Board, Bangor, UK.,Cancer Research Centre, Division of Biomedical Sciences, Warwick Medical School, Coventry, UK.,Unit 935, French National Institute for Health and Medical Research (INSERM), Villejuif, France
| | - Karen Mustian
- Department of Surgery, University of Rochester, Rochester, NY
| | - Shelli Kesler
- Cancer Neuroscience Laboratory, School of Nursing, University of Texas at Austin, Austin, TX
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188
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Bertile F, Plumel M, Maes P, Hirschler A, Challet E. Daytime Restricted Feeding Affects Day-Night Variations in Mouse Cerebellar Proteome. Front Mol Neurosci 2021; 14:613161. [PMID: 33912010 PMCID: PMC8072461 DOI: 10.3389/fnmol.2021.613161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 03/12/2021] [Indexed: 12/14/2022] Open
Abstract
The cerebellum harbors a circadian clock that can be shifted by scheduled mealtime and participates in behavioral anticipation of food access. Large-scale two-dimensional difference gel electrophoresis (2D-DIGE) combined with mass spectrometry was used to identify day–night variations in the cerebellar proteome of mice fed either during daytime or nighttime. Experimental conditions led to modified expression of 89 cerebellar proteins contained in 63 protein spots. Five and 33 spots were changed respectively by time-of-day or feeding conditions. Strikingly, several proteins of the heat-shock protein family (i.e., Hsp90aa1, 90ab1, 90b1, and Hspa2, 4, 5, 8, 9) were down-regulated in the cerebellum of daytime food-restricted mice. This was also the case for brain fatty acid protein (Fabp7) and enzymes involved in oxidative phosphorylation (Ndufs1) or folate metabolism (Aldh1l1). In contrast, aldolase C (Aldoc or zebrin II) and pyruvate carboxylase (Pc), two enzymes involved in carbohydrate metabolism, and vesicle-fusing ATPase (Nsf) were up-regulated during daytime restricted feeding, possibly reflecting increased neuronal activity. Significant feeding × time-of-day interactions were found for changes in the intensity of 20 spots. Guanine nucleotide-binding protein G(o) subunit alpha (Gnao1) was more expressed in the cerebellum before food access. Neuronal calcium-sensor proteins [i.e., parvalbumin (Pvalb) and visinin-like protein 1 (Vsnl1)] were inversely regulated in daytime food-restricted mice, compared to control mice fed at night. Furthermore, expression of three enzymes modulating the circadian clockwork, namely heterogeneous nuclear ribonucleoprotein K (Hnrnpk), serine/threonine-protein phosphatases 1 (Ppp1cc and Ppp1cb subunits) and 5 (Ppp5), was differentially altered by daytime restricted feeding. Besides cerebellar proteins affected only by feeding conditions or daily cues, specific changes in in protein abundance before food access may be related to behavioral anticipation of food access and/or feeding-induced shift of the cerebellar clockwork.
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Affiliation(s)
- Fabrice Bertile
- Institut Pluridisciplinaire Hubert Curien, LSMBO, Université de Strasbourg, Centre National de la Recherche Scientifique, Strasbourg, France
| | - Marine Plumel
- Institut Pluridisciplinaire Hubert Curien, LSMBO, Université de Strasbourg, Centre National de la Recherche Scientifique, Strasbourg, France
| | - Pauline Maes
- Institut Pluridisciplinaire Hubert Curien, LSMBO, Université de Strasbourg, Centre National de la Recherche Scientifique, Strasbourg, France
| | - Aurélie Hirschler
- Institut Pluridisciplinaire Hubert Curien, LSMBO, Université de Strasbourg, Centre National de la Recherche Scientifique, Strasbourg, France
| | - Etienne Challet
- Institut des Neurosciences Cellulaires et Intégratives, Université de Strasbourg, Centre National de la Recherche Scientifique, Strasbourg, France
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189
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Jagannath A, Varga N, Dallmann R, Rando G, Gosselin P, Ebrahimjee F, Taylor L, Mosneagu D, Stefaniak J, Walsh S, Palumaa T, Di Pretoro S, Sanghani H, Wakaf Z, Churchill GC, Galione A, Peirson SN, Boison D, Brown SA, Foster RG, Vasudevan SR. Adenosine integrates light and sleep signalling for the regulation of circadian timing in mice. Nat Commun 2021; 12:2113. [PMID: 33837202 PMCID: PMC8035342 DOI: 10.1038/s41467-021-22179-z] [Citation(s) in RCA: 61] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Accepted: 02/18/2021] [Indexed: 01/01/2023] Open
Abstract
The accumulation of adenosine is strongly correlated with the need for sleep and the detection of sleep pressure is antagonised by caffeine. Caffeine also affects the circadian timing system directly and independently of sleep physiology, but how caffeine mediates these effects upon the circadian clock is unclear. Here we identify an adenosine-based regulatory mechanism that allows sleep and circadian processes to interact for the optimisation of sleep/wake timing in mice. Adenosine encodes sleep history and this signal modulates circadian entrainment by light. Pharmacological and genetic approaches demonstrate that adenosine acts upon the circadian clockwork via adenosine A1/A2A receptor signalling through the activation of the Ca2+ -ERK-AP-1 and CREB/CRTC1-CRE pathways to regulate the clock genes Per1 and Per2. We show that these signalling pathways converge upon and inhibit the same pathways activated by light. Thus, circadian entrainment by light is systematically modulated on a daily basis by sleep history. These findings contribute to our understanding of how adenosine integrates signalling from both light and sleep to regulate circadian timing in mice.
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Affiliation(s)
- Aarti Jagannath
- Sleep and Circadian Neuroscience Institute (SCNi), Nuffield Department of Clinical Neurosciences, University of Oxford, OMPI-G, Oxford, UK.
| | - Norbert Varga
- Sleep and Circadian Neuroscience Institute (SCNi), Nuffield Department of Clinical Neurosciences, University of Oxford, OMPI-G, Oxford, UK
| | - Robert Dallmann
- Biomedical Sciences, Warwick Medical School, University of Warwick, Coventry, UK
| | - Gianpaolo Rando
- Department of Molecular Biology, University of Geneva, Geneva 4, Switzerland
| | - Pauline Gosselin
- Department of Molecular Biology, University of Geneva, Geneva 4, Switzerland
| | - Farid Ebrahimjee
- Sleep and Circadian Neuroscience Institute (SCNi), Department of Pharmacology, University of Oxford, Oxford, UK
| | - Lewis Taylor
- Sleep and Circadian Neuroscience Institute (SCNi), Nuffield Department of Clinical Neurosciences, University of Oxford, OMPI-G, Oxford, UK
| | - Dragos Mosneagu
- Sleep and Circadian Neuroscience Institute (SCNi), Department of Pharmacology, University of Oxford, Oxford, UK
| | - Jakub Stefaniak
- Sleep and Circadian Neuroscience Institute (SCNi), Department of Pharmacology, University of Oxford, Oxford, UK
| | - Steven Walsh
- Sleep and Circadian Neuroscience Institute (SCNi), Nuffield Department of Clinical Neurosciences, University of Oxford, OMPI-G, Oxford, UK
| | - Teele Palumaa
- Sleep and Circadian Neuroscience Institute (SCNi), Nuffield Department of Clinical Neurosciences, University of Oxford, OMPI-G, Oxford, UK
| | - Simona Di Pretoro
- Sleep and Circadian Neuroscience Institute (SCNi), Nuffield Department of Clinical Neurosciences, University of Oxford, OMPI-G, Oxford, UK
| | - Harshmeena Sanghani
- Sleep and Circadian Neuroscience Institute (SCNi), Department of Pharmacology, University of Oxford, Oxford, UK
| | - Zeinab Wakaf
- Sleep and Circadian Neuroscience Institute (SCNi), Department of Pharmacology, University of Oxford, Oxford, UK
| | - Grant C Churchill
- Sleep and Circadian Neuroscience Institute (SCNi), Department of Pharmacology, University of Oxford, Oxford, UK
| | - Antony Galione
- Sleep and Circadian Neuroscience Institute (SCNi), Department of Pharmacology, University of Oxford, Oxford, UK
| | - Stuart N Peirson
- Sleep and Circadian Neuroscience Institute (SCNi), Nuffield Department of Clinical Neurosciences, University of Oxford, OMPI-G, Oxford, UK
| | - Detlev Boison
- Department of Neurosurgery, Robert Wood Johnson Medical School, Rutgers University, Piscataway, NJ, USA
| | - Steven A Brown
- Institute of Pharmacology and Toxicology, University of Zurich, Zurich, Switzerland
| | - Russell G Foster
- Sleep and Circadian Neuroscience Institute (SCNi), Nuffield Department of Clinical Neurosciences, University of Oxford, OMPI-G, Oxford, UK.
| | - Sridhar R Vasudevan
- Sleep and Circadian Neuroscience Institute (SCNi), Department of Pharmacology, University of Oxford, Oxford, UK.
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190
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Buijink MR, Michel S. A multi-level assessment of the bidirectional relationship between aging and the circadian clock. J Neurochem 2021; 157:73-94. [PMID: 33370457 PMCID: PMC8048448 DOI: 10.1111/jnc.15286] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 12/23/2020] [Accepted: 12/23/2020] [Indexed: 12/15/2022]
Abstract
The daily temporal order of physiological processes and behavior contribute to the wellbeing of many organisms including humans. The central circadian clock, which coordinates the timing within our body, is located in the suprachiasmatic nucleus (SCN) of the hypothalamus. Like in other parts of the brain, aging impairs the SCN function, which in turn promotes the development and progression of aging-related diseases. We here review the impact of aging on the different levels of the circadian clock machinery-from molecules to organs-with a focus on the role of the SCN. We find that the molecular clock is less effected by aging compared to other cellular components of the clock. Proper rhythmic regulation of intracellular signaling, ion channels and neuronal excitability of SCN neurons are greatly disturbed in aging. This suggests a disconnection between the molecular clock and the electrophysiology of these cells. The neuronal network of the SCN is able to compensate for some of these cellular deficits. However, it still results in a clear reduction in the amplitude of the SCN electrical rhythm, suggesting a weakening of the output timing signal. Consequently, other brain areas and organs not only show aging-related deficits in their own local clocks, but also receive a weaker systemic timing signal. The negative spiral completes with the weakening of positive feedback from the periphery to the SCN. Consequently, chronotherapeutic interventions should aim at strengthening overall synchrony in the circadian system using life-style and/or pharmacological approaches.
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Affiliation(s)
- M. Renate Buijink
- Department of Cellular and Chemical BiologyLaboratory for NeurophysiologyLeiden University Medical CenterLeidenthe Netherlands
| | - Stephan Michel
- Department of Cellular and Chemical BiologyLaboratory for NeurophysiologyLeiden University Medical CenterLeidenthe Netherlands
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191
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Kermorgant M, Ben Salem J, Iacovoni JS, Calise D, Dahan L, Guiard BP, Lopez S, Lairez O, Lasbories A, Nasr N, Pavy Le‐Traon A, Beaudry F, Senard J, Arvanitis DN. Cardiac sensory afferents modulate susceptibility to anxio-depressive behaviour in a mouse model of chronic heart failure. Acta Physiol (Oxf) 2021; 231:e13601. [PMID: 33316126 DOI: 10.1111/apha.13601] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 11/23/2020] [Accepted: 12/09/2020] [Indexed: 12/20/2022]
Abstract
AIM Impairments in cerebral structure and cognitive performance in chronic heart failure (CHF) are critical components of its comorbidity spectrum. Autonomic afferents that arise from cardiac sensory fibres show enhanced activity with CHF. Desensitization of these fibres by local application of resiniferatoxin (RTX) during myocardial infarction (MI) is known to prevent cardiac hypertrophy, sympathetic hyperactivity and CHF. Whether these afferents mediate cerebral allostasis is unknown. METHODS CHF was induced by myocardial infarction. To evaluate if cardiac afferents contribute to cerebral allostasis, RTX was acutely applied to the pericardial space in controls (RTX) and in MI treated animals (MI/RTX). Subjects were then evaluated in a series of behavioural tests recapitulating different symptoms of depressive disorders. Proteomics of the frontal cortices (FC) was performed to identify contributing proteins and pathways responsible for behavioural allostasis. RESULTS Desensitization of cardiac afferents relieves hallmarks of an anxio/depressive-like state in mice. Unique protein signatures and regulatory pathways in FCs isolated from each treatment reveal the degree of complexity inherent in the FC response to stresses originating in the heart. While cortices from the combined treatment (MI/RTX) did not retain protein signatures from the individual treatment groups, all three groups suffer dysregulation in circadian entrainment. CONCLUSION CHF is comorbid with an anxio/depressive-like state and ablation of cardiac afferents relieves the despair phenotype. The strikingly different proteomic profiles observed in FCs suggest that MI and RTX lead to unique brain-signalling patterns and that the combined treatment, potentially through destructive interference mechanisms, most closely resembles controls.
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Affiliation(s)
- Marc Kermorgant
- INSERM DR Midi‐Pyrénées LimousinInstitut des Maladies Métaboliques et Cardiovasculaires (I2MC) UMR1048Université de Toulouse III Toulouse France
| | - Jennifer Ben Salem
- INSERM DR Midi‐Pyrénées LimousinInstitut des Maladies Métaboliques et Cardiovasculaires (I2MC) UMR1048Université de Toulouse III Toulouse France
- Groupe de Recherche en Pharmacologie Animale du Québec (GREPAQ) Département de Biomédecine Vétérinaire Faculté de Médecine Vétérinaire Université de Montréal Saint Hyacinthe QC Canada
- Centre de recherche sur le cerveau et l’apprentissage (CIRCA) Université de Montréal Montréal QC Canada
| | - Jason S. Iacovoni
- INSERM DR Midi‐Pyrénées LimousinInstitut des Maladies Métaboliques et Cardiovasculaires (I2MC) UMR1048Université de Toulouse III Toulouse France
| | - Denis Calise
- INSERM DR Midi‐Pyrénées LimousinCentre Régional d’Exploration Fonctionnelle et Ressources Expérimentales Service Microchirurgie, (CREFRE‐US06, Rangueil) Toulouse France
| | - Lionel Dahan
- Centre de Recherches sur la Cognition Animale Centre de Biologie Intégrative Université de Toulouse Toulouse France
- CNRSUniversité de Toulouse III Toulouse France
| | - Bruno P. Guiard
- Centre de Recherches sur la Cognition Animale Centre de Biologie Intégrative Université de Toulouse Toulouse France
- CNRSUniversité de Toulouse III Toulouse France
| | - Sébastien Lopez
- Centre de Recherches sur la Cognition Animale Centre de Biologie Intégrative Université de Toulouse Toulouse France
- CNRSUniversité de Toulouse III Toulouse France
| | - Olivier Lairez
- INSERM DR Midi‐Pyrénées LimousinInstitut des Maladies Métaboliques et Cardiovasculaires (I2MC) UMR1048Université de Toulouse III Toulouse France
- Fédération des services de cardiologie Hôpital RangueilUniversité de Toulouse III Toulouse France
| | - Antoine Lasbories
- INSERM DR Midi‐Pyrénées LimousinInstitut des Maladies Métaboliques et Cardiovasculaires (I2MC) UMR1048Université de Toulouse III Toulouse France
| | - Nathalie Nasr
- INSERM DR Midi‐Pyrénées LimousinInstitut des Maladies Métaboliques et Cardiovasculaires (I2MC) UMR1048Université de Toulouse III Toulouse France
- Département de Neurologie et Institut des Neurosciences CHU de ToulouseUniversité de Toulouse III Toulouse France
| | - Anne Pavy Le‐Traon
- INSERM DR Midi‐Pyrénées LimousinInstitut des Maladies Métaboliques et Cardiovasculaires (I2MC) UMR1048Université de Toulouse III Toulouse France
- Département de Neurologie et Institut des Neurosciences CHU de ToulouseUniversité de Toulouse III Toulouse France
| | - Francis Beaudry
- Groupe de Recherche en Pharmacologie Animale du Québec (GREPAQ) Département de Biomédecine Vétérinaire Faculté de Médecine Vétérinaire Université de Montréal Saint Hyacinthe QC Canada
- Centre de recherche sur le cerveau et l’apprentissage (CIRCA) Université de Montréal Montréal QC Canada
| | - Jean‐Michel Senard
- INSERM DR Midi‐Pyrénées LimousinInstitut des Maladies Métaboliques et Cardiovasculaires (I2MC) UMR1048Université de Toulouse III Toulouse France
- Département de Neurologie et Institut des Neurosciences CHU de ToulouseUniversité de Toulouse III Toulouse France
- Service de Pharmacologie Clinique CHU de ToulouseUniversité de Toulouse III Toulouse France
| | - Dina N Arvanitis
- INSERM DR Midi‐Pyrénées LimousinInstitut des Maladies Métaboliques et Cardiovasculaires (I2MC) UMR1048Université de Toulouse III Toulouse France
- CNRSUniversité de Toulouse III Toulouse France
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192
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Mendoza J. Nighttime Light Hurts Mammalian Physiology: What Diurnal Rodent Models Are Telling Us. Clocks Sleep 2021; 3:236-250. [PMID: 33915800 PMCID: PMC8167723 DOI: 10.3390/clockssleep3020014] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 02/16/2021] [Accepted: 03/15/2021] [Indexed: 01/24/2023] Open
Abstract
Natural sunlight permits organisms to synchronize their physiology to the external world. However, in current times, natural sunlight has been replaced by artificial light in both day and nighttime. While in the daytime, indoor artificial light is of lower intensity than natural sunlight, leading to a weak entrainment signal for our internal biological clock, at night the exposure to artificial light perturbs the body clock and sleep. Although electric light at night allows us "to live in darkness", our current lifestyle facilitates nighttime exposure to light by the use, or abuse, of electronic devices (e.g., smartphones). The chronic exposure to light at nighttime has been correlated to mood alterations, metabolic dysfunctions, and poor cognition. To decipher the brain mechanisms underlying these alterations, fundamental research has been conducted using animal models, principally of nocturnal nature (e.g., mice). Nevertheless, because of the diurnal nature of human physiology, it is also important to find and propose diurnal animal models for the study of the light effects in circadian biology. The present review provides an overview of the effects of light at nighttime on physiology and behavior in diurnal mammals, including humans. Knowing how the brain reacts to artificial light exposure, using diurnal rodent models, is fundamental for the development of new strategies in human health based in circadian biology.
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Affiliation(s)
- Jorge Mendoza
- Institute of Cellular and Integrative Neuroscience CNRS UPR3212, University of Strasburg, 8 allée du Général Rouvillois, 67000 Strasbourg, France
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193
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de Rezende LMT, Brito LC, Moura AG, Costa AJLD, Leal TF, Favarato ES, Favarato LSC, Natali AJ, Coimbra CC, Prímola-Gomes TN. Core temperature circadian rhythm across aging in Spontaneously Hypertensive Rats. J Therm Biol 2021; 97:102807. [PMID: 33863423 DOI: 10.1016/j.jtherbio.2020.102807] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 11/24/2020] [Accepted: 12/05/2020] [Indexed: 11/18/2022]
Abstract
The purpose of this study was to evaluate the circadian rhythm of core temperature (Tcore) across aging in Spontaneously Hypertensive Rats (SHR) with comparison to the two rat strains often used as their normotensive control animals, namely, Wistar (WIS) and Wistar Kyoto (WKY). METHODS WIS, WKY and SHR rats were subdivided into three different groups according their age: WIS16, WIS48, WIS72, WKY16, WKY48, WKY72, SHR16, SHR48 and SHR72 weeks-old. Body mass and blood pressure were periodically measured along the experiments. All animal group had their circadian rhythm of Tcore evaluated over three consecutive days (72 h) by telemetry using an implanted temperature sensor. The Tcore circadian rhythm was averaged in 1-h blocks and analyzed using the cosinor method. RESULTS Sixteen-week-old SHR (SHR16) presented higher Tcore than WIS16 (from 06am to 06pm) and WKY16 (from 07am to 06pm). Both normotensive groups exhibited increases in Tcore during circadian rhythm with aging. The cosinor analysis showed no differences between strains and ages for the acrophase. An age effect on the SHR strain (SHR16 < SHR72) was observed regarding the amplitude. SHR16 had higher values regarding MESOR compared to WIS16 and WKY16. In addition, WIS72 and WKY72 showed higher values than WIS16 and WKY16, respectively. Finally, no differences were observed in the strength rhythm analysis. CONCLUSIONS SHR presented impaired thermoregulatory control at only 16 weeks of age when showing a higher body temperature during the activity phase, while other circadian rhythm parameters showed no differences across aging. Therefore, in taking our results as a whole we can conclude that WIS and WKY are appropriate Wistar strains to be used as normotensive controls for SHR.
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Affiliation(s)
- Leonardo M T de Rezende
- Laboratório de Biologia do Exercício, Departamento de Educação Física, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Leandro C Brito
- Laboratório de Hemodinâmica da Atividade Locomotora, Escola de Educação Física e Esporte, Universidade de São Paulo, São Paulo, SP, Brazil; Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Anselmo G Moura
- Laboratório de Biologia do Exercício, Departamento de Educação Física, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Alexandre J L D Costa
- Laboratório de Biologia do Exercício, Departamento de Educação Física, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Tiago F Leal
- Laboratório de Biologia do Exercício, Departamento de Educação Física, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Evandro S Favarato
- Departamento de Medicina Veterinária, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Lukiya S C Favarato
- Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Antônio J Natali
- Laboratório de Biologia do Exercício, Departamento de Educação Física, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Cândido C Coimbra
- Laboratório de Endocrinologia e Metabolismo, Departamento de Fisiologia e Biofísica, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Thales N Prímola-Gomes
- Laboratório de Biologia do Exercício, Departamento de Educação Física, Universidade Federal de Viçosa, Viçosa, MG, Brazil.
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194
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Abstract
Circadian dysfunction or dysregulation is associated with many chronic morbidities. Current state-of-art technologies do not provide an accurate estimation of the extent of disease affliction. Recent advances call for using wearables for improving management and diagnosis of circadian related disorders. Sweat contains an abundance of relevant biomarkers like cortisol, DHEA, and so forth, which could be leveraged toward tracking the user's chronobiology. In this article, we provide a review of the key developments in the field of wearable sensors for circadian technologies. We highlight the value of using sweat along with portable electronics toward developing state-of-the-art platforms for efficient diagnosis and management of chronic conditions. Finally, we discuss challenges and opportunities for using wearable sweat sensors for circadian diagnosis and disease management.
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Affiliation(s)
- Sayali Upasham
- Department of Bioengineering, University of Texas at Dallas, Richardson, Texas 75080, United States
| | | | - Paul Rice
- Department of Bioengineering, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Shalini Prasad
- Department of Bioengineering, University of Texas at Dallas, Richardson, Texas 75080, United States
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195
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Adamovich Y, Ezagouri S, Dandavate V, Asher G. Monitoring daytime differences in moderate intensity exercise capacity using treadmill test and muscle dissection. STAR Protoc 2021; 2:100331. [PMID: 33598660 PMCID: PMC7868630 DOI: 10.1016/j.xpro.2021.100331] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
There is growing interest in medicine and sports in uncovering exercise modifiers that enhance or limit exercise capacity. Here, we detail a protocol for testing the daytime effect on running capacity in mice using a moderate intensity treadmill effort test. Instructions for dissecting soleus, gastrocnemius plantaris, and quadriceps muscles for further analysis are provided as well. This experimental setup is optimized for addressing questions regarding the involvement of daytime and circadian clocks in regulating exercise capacity. For complete details on the use and execution of this protocol, please refer to Ezagouri et al. (2019). Exercise capacity is influenced by the time of day Protocol for determining moderate intensity exercise capacity using treadmill test Instructions for muscle dissection
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Affiliation(s)
- Yaarit Adamovich
- Department of Biomolecular Sciences, Weizmann Institute of Science, 7610001 Rehovot, Israel
| | - Saar Ezagouri
- Department of Biomolecular Sciences, Weizmann Institute of Science, 7610001 Rehovot, Israel
| | - Vaishnavi Dandavate
- Department of Biomolecular Sciences, Weizmann Institute of Science, 7610001 Rehovot, Israel
| | - Gad Asher
- Department of Biomolecular Sciences, Weizmann Institute of Science, 7610001 Rehovot, Israel
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196
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Mavroudis PD, Jusko WJ. Mathematical modeling of mammalian circadian clocks affecting drug and disease responses. J Pharmacokinet Pharmacodyn 2021; 48:375-386. [PMID: 33725238 DOI: 10.1007/s10928-021-09746-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 02/26/2021] [Indexed: 12/28/2022]
Abstract
To align with daily environmental changes, most physiological processes in mammals exhibit a time-of-day rhythmicity. This circadian control of physiology is intrinsically driven by a cell-autonomous clock gene network present in almost all cells of the body that drives rhythmic expression of genes that regulate numerous molecular and cellular processes. Accordingly, many aspects of pharmacology and toxicology also oscillate in a time-of-day manner giving rise to diverse effects on pharmacokinetics and pharmacodynamics. Genome-wide studies and mathematical modeling are available tools that have significantly improved our understanding of these nonlinear aspects of physiology and therapeutics. In this manuscript current literature and our prior work on the model-based approaches that have been used to explore circadian genomic systems of mammals are reviewed. Such basic understanding and having an integrative approach may provide new strategies for chronotherapeutic drug treatments and yield new insights for the restoration of the circadian system when altered by diseases.
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Affiliation(s)
- Panteleimon D Mavroudis
- Quantitative Pharmacology, DMPK, Sanofi, Waltham, MA, 02451, USA. .,State University of New York, School of Pharmacy and Pharmaceutical Sciences, University of Buffalo, Buffalo, NY, USA.
| | - William J Jusko
- State University of New York, School of Pharmacy and Pharmaceutical Sciences, University of Buffalo, Buffalo, NY, USA
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197
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Ren B, Ma C, Chen L, FitzGerald GA, Yang G. Impact of Time-Restricted Feeding to Late Night on Adaptation to a 6 h Phase Advance of the Light-Dark Cycle in Mice. Front Physiol 2021; 12:634187. [PMID: 33664675 PMCID: PMC7920952 DOI: 10.3389/fphys.2021.634187] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 01/26/2021] [Indexed: 11/24/2022] Open
Abstract
In modern society, more and more people suffer from circadian disruption, which in turn affects health. But until now, there are no widely accepted therapies for circadian disorders. Rhythmic feeding behavior is one of the most potent non-photic zeitgebers, thus it has been suggested that it was important to eat during specific periods of time (time-restricted feeding, TRF) so that feeding is aligned with environmental cues under normal light/dark conditions. Here, we challenged mice with a 6 h advanced shift, combined with various approaches to TRF, and found that food restricted to the second half of the nights after the shift facilitated adaptation. This coincided with improved resilience to sepsis. These results raise the possibility of reducing the adverse responses to jet lag by subsequent timing of food intake.
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Affiliation(s)
- Baoyin Ren
- School of Bioengineering, Dalian University of Technology, Dalian, China
| | - Changxiao Ma
- School of Bioengineering, Dalian University of Technology, Dalian, China
| | - Lihong Chen
- Advanced Institute for Medical Sciences, Dalian Medical University, Dalian, China
| | - Garret A FitzGerald
- Perelman School of Medicine, Institute for Translational Medicine and Therapeutics, University of Pennsylvania, Philadelphia, PA, United States
| | - Guangrui Yang
- School of Bioengineering, Dalian University of Technology, Dalian, China
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198
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Issah Y, Naik A, Tang SY, Forrest K, Brooks TG, Lahens N, Theken KN, Mermigos M, Sehgal A, Worthen GS, FitzGerald GA, Sengupta S. Loss of circadian protection against influenza infection in adult mice exposed to hyperoxia as neonates. eLife 2021; 10:e61241. [PMID: 33650487 PMCID: PMC7924938 DOI: 10.7554/elife.61241] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 02/14/2021] [Indexed: 12/13/2022] Open
Abstract
Adverse early-life exposures have a lasting negative impact on health. Neonatal hyperoxia that is a risk factor for bronchopulmonary dysplasia confers susceptibility to influenza A virus (IAV) infection later in life. Given our previous findings that the circadian clock protects against IAV, we asked if the long-term impact of neonatal hyperoxia vis-à-vis IAV infection includes circadian disruption. Here, we show that neonatal hyperoxia abolishes the clock-mediated time of day protection from IAV in mice, independent of viral burden through host tolerance pathways. We discovered that the lung intrinsic clock (and not the central or immune clocks) mediated this dysregulation. Loss of circadian protein, Bmal1, in alveolar type 2 (AT2) cells recapitulates the increased mortality, loss of temporal gating, and other key features of hyperoxia-exposed animals. Our data suggest a novel role for the circadian clock in AT2 cells in mediating long-term effects of early-life exposures to the lungs.
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Affiliation(s)
- Yasmine Issah
- The Children’s Hospital of PhiladelphiaPhiladelphiaUnited States
| | - Amruta Naik
- The Children’s Hospital of PhiladelphiaPhiladelphiaUnited States
| | - Soon Y Tang
- Institute of Translational Medicine and Therapeutics (ITMAT), University of PennsylvaniaPhiladelphiaUnited States
| | - Kaitlyn Forrest
- The Children’s Hospital of PhiladelphiaPhiladelphiaUnited States
| | - Thomas G Brooks
- Institute of Translational Medicine and Therapeutics (ITMAT), University of PennsylvaniaPhiladelphiaUnited States
| | - Nicholas Lahens
- Institute of Translational Medicine and Therapeutics (ITMAT), University of PennsylvaniaPhiladelphiaUnited States
| | - Katherine N Theken
- Institute of Translational Medicine and Therapeutics (ITMAT), University of PennsylvaniaPhiladelphiaUnited States
- Systems Pharmacology University of Pennsylvania Perelman School of MedicinePhiladelphiaUnited States
| | - Mara Mermigos
- The Children’s Hospital of PhiladelphiaPhiladelphiaUnited States
| | - Amita Sehgal
- Chronobiology and Sleep Institute, University of PennsylvaniaPhiladelphiaUnited States
- Department of Neuroscience, University of Pennsylvania Perelman School of MedicinePhiladelphiaUnited States
| | - George S Worthen
- The Children’s Hospital of PhiladelphiaPhiladelphiaUnited States
- Department of Pediatrics, University of Pennsylvania Perelman School of MedicinePhiladelphiaUnited States
| | - Garret A FitzGerald
- Institute of Translational Medicine and Therapeutics (ITMAT), University of PennsylvaniaPhiladelphiaUnited States
- Systems Pharmacology University of Pennsylvania Perelman School of MedicinePhiladelphiaUnited States
- Chronobiology and Sleep Institute, University of PennsylvaniaPhiladelphiaUnited States
| | - Shaon Sengupta
- The Children’s Hospital of PhiladelphiaPhiladelphiaUnited States
- Institute of Translational Medicine and Therapeutics (ITMAT), University of PennsylvaniaPhiladelphiaUnited States
- Chronobiology and Sleep Institute, University of PennsylvaniaPhiladelphiaUnited States
- Department of Pediatrics, University of Pennsylvania Perelman School of MedicinePhiladelphiaUnited States
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199
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Song BJ, Sharp SJ, Rogulja D. Daily rewiring of a neural circuit generates a predictive model of environmental light. SCIENCE ADVANCES 2021; 7:7/13/eabe4284. [PMID: 33762336 PMCID: PMC7990339 DOI: 10.1126/sciadv.abe4284] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 02/03/2021] [Indexed: 05/02/2023]
Abstract
Behavioral responsiveness to external stimulation is shaped by context. We studied how sensory information can be contextualized, by examining light-evoked locomotor responsiveness of Drosophila relative to time of day. We found that light elicits an acute increase in locomotion (startle) that is modulated in a time-of-day-dependent manner: Startle is potentiated during the nighttime, when light is unexpected, but is suppressed during the daytime. The internal daytime-nighttime context is generated by two interconnected and functionally opposing populations of circadian neurons-LNvs generating the daytime state and DN1as generating the nighttime state. Switching between the two states requires daily remodeling of LNv and DN1a axons such that the maximum presynaptic area in one population coincides with the minimum in the other. We propose that a dynamic model of environmental light resides in the shifting connectivities of the LNv-DN1a circuit, which helps animals evaluate ongoing conditions and choose a behavioral response.
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Affiliation(s)
- Bryan J Song
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA
| | - Slater J Sharp
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA
| | - Dragana Rogulja
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA.
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200
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Kim R, Reed MC. A mathematical model of circadian rhythms and dopamine. Theor Biol Med Model 2021; 18:8. [PMID: 33596936 PMCID: PMC7891144 DOI: 10.1186/s12976-021-00139-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 02/03/2021] [Indexed: 11/21/2022] Open
Abstract
Background The superchiasmatic nucleus (SCN) serves as the primary circadian (24hr) clock in mammals and is known to control important physiological functions such as the sleep-wake cycle, hormonal rhythms, and neurotransmitter regulation. Experimental results suggest that some of these functions reciprocally influence circadian rhythms, creating a highly complex network. Among the clock’s downstream products, orphan nuclear receptors REV-ERB and ROR are particularly interesting because they coordinately modulate the core clock circuitry. Recent experimental evidence shows that REV-ERB and ROR are not only crucial for lipid metabolism but are also involved in dopamine (DA) synthesis and degradation, which could have meaningful clinical implications for conditions such as Parkinson’s disease and mood disorders. Methods We create a mathematical model consisting of differential equations that express how the circadian variables are influenced by light, how REV-ERB and ROR feedback to the clock, and how REV-ERB, ROR, and BMAL1-CLOCK affect the dopaminergic system. The structure of the model is based on the findings of experimentalists. Results We compare our model predictions to experimental data on clock components in different light-dark conditions and in the presence of genetic perturbations. Our model results are consistent with experimental results on REV-ERB and ROR and allow us to predict the circadian variations in tyrosine hydroxylase and monoamine oxidase seen in experiments. By connecting our model to an extant model of dopamine synthesis, release, and reuptake, we are able to predict circadian oscillations in extracellular DA and homovanillic acid that correspond well with experimental observations. Conclusions The predictions of the mathematical model are consistent with a wide variety of experimental observations. Our calculations show that the mechanisms proposed by experimentalists by which REV-ERB, ROR, and BMAL1-CLOCK influence the DA system are sufficient to explain the circadian oscillations observed in dopaminergic variables. Our mathematical model can be used for further investigations of the effects of the mammalian circadian clock on the dopaminergic system. The model can also be used to predict how perturbations in the circadian clock disrupt the dopaminergic system and could potentially be used to find drug targets that ameliorate these disruptions.
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Affiliation(s)
- Ruby Kim
- Department of Mathematics, Duke University, 120 Science Drive, Box 90320, Durham, 27708, NC, USA
| | - Michael C Reed
- Department of Mathematics, Duke University, 120 Science Drive, Box 90320, Durham, 27708, NC, USA.
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