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https://www.readbyqxmd.com/read/27918287/measuring-discrimination-and-reversal-learning-in-mouse-models-within-4-days-and-without-prior-food-deprivation
#1
Esther Remmelink, August B Smit, Matthijs Verhage, Maarten Loos
Many neurological and psychiatric disorders are characterized by deficits in cognitive flexibility. Modeling cognitive flexibility in mice enables the investigation of mechanisms underlying these deficits. The majority of currently available behavioral tests targeting this cognitive domain are reversal learning tasks that require scheduled food restriction, extended training periods and labor-intensive, and stress-inducing animal handling. Here, we describe a novel 4-day (4-d) continuously running task measuring discrimination- and reversal learning in an automated home cage (CognitionWall DL/RL task) that largely eliminates these limitations...
November 2016: Learning & Memory
https://www.readbyqxmd.com/read/27915366/aging-has-the-opposite-effect-on-camp-and-cgmp-circadian-variations-in-rat-leydig-cells
#2
Aleksandar Z Baburski, Srdjan J Sokanovic, Silvana A Andric, Tatjana S Kostic
The Leydig cell physiology displays a circadian rhythm driven by a complex interaction of the reproductive axis hormones and circadian system. The final output of this regulatory process is circadian pattern of steroidogenic genes expression and testosterone production. Aging gradually decreases robustness of rhythmic testosterone secretion without change in pattern of LH secretion. Here, we analyzed effect of aging on circadian variation of cAMP and cGMP signaling in Leydig cells. Results showed opposite effect of aging on cAMP and cGMP daily variation...
December 3, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27912863/circadian-rhythm-and-sleep-during-prolonged-antarctic-residence-at-chinese-zhongshan-station
#3
Nan Chen, Quan Wu, Yanlei Xiong, Guang Chen, Dandan Song, Chengli Xu
OBJECTIVE: Residence at Zhongshan Station (69°22'24″S, 76°22'40″E) for over 1 year exposes winter-over members to marked changes of light-dark cycle, ranging from the constant daylight of polar days to the constant darkness of polar nights, in addition to geographic and social isolation. This extreme photoperiodic environment may increase the risk of sleep disturbances and circadian desynchrony. The aim of this study was to investigate the circadian rhythm and sleep phase of Chinese winter-over expeditioners at Zhongshan Station...
December 2016: Wilderness & Environmental Medicine
https://www.readbyqxmd.com/read/27900568/control-of-phosphate-balance-by-the-kidney-and-intestine
#4
REVIEW
Ichiro Kaneko, Sawako Tatsumi, Hiroko Segawa, Ken-Ichi Miyamoto
The prevention and correction of hyperphosphatemia are major goals of the treatment of chronic kidney disease (CKD)-bone mineral disorders, and thus, Pi balance requires special attention. Pi balance is maintained by intestinal absorption, renal excretion, and bone accretion. The kidney is mainly responsible for the plasma Pi concentration. In CKD, reduced glomerular filtration rate leads to various Pi metabolism abnormalities, and Pi absorption in the small intestine also has an important role in Pi metabolism...
November 30, 2016: Clinical and Experimental Nephrology
https://www.readbyqxmd.com/read/27891621/animal-cryptochromes-divergent-roles-in-light-perception-circadian-timekeeping-and-beyond
#5
Alicia K Michael, Jennifer L Fribourgh, Russell N Van Gelder, Carrie L Partch
Cryptochromes are evolutionarily related to the light-dependent DNA repair enzyme photolyase, serving as major regulators of circadian rhythms in insects and vertebrate animals. There are two types of cryptochromes in the animal kingdom: Drosophila-like CRYs that act as non-visual photopigments linking circadian rhythms to the environmental light/dark cycle, and vertebrate-like CRYs that do not appear to sense light directly, but control the generation of circadian rhythms by acting as transcriptional repressors...
November 28, 2016: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/27887821/-sleep-disorders-in-internet-addiction
#6
Aymeric Petit, Laurent Karila, Candice Estellat, Delphine Moisan, Michel Reynaud, Marie-Pia D'Ortho, Michel Lejoyeux, Fanny Levy
BACKGROUND: The relationship between sleep disorders and Internet addiction has been little work. Given the importance of these disorders, we felt it appropriate to make a synthesis of available data and to establish causality or accountability between Internet addiction and the onset of sleep disorders. METHODS: A literature review was then performed. We selected scientific articles in English and French, published between 1987 and 2016 by consulting the databases Medline, Embase, PsycINFO and Google Scholar...
November 22, 2016: La Presse Médicale
https://www.readbyqxmd.com/read/27885322/nedley-depression-hit-hypothesis-identifying-depression-and-its-causes
#7
REVIEW
Neil Nedley, Francisco E Ramirez
Depression is often diagnosed using the Diagnostic and Statistical Manual of Mental Disorders Fifth Edition (DSM-5) criteria. We propose how certain lifestyle choices and non-modifiable factors can predict the development of depression. We identified 10 cause categories (hits or "blows" to the brain) and theorize that four or more active hits could trigger a depression episode. Methods. A sample of 4271 participants from our community-based program (70% female; ages 17-94 years) was assessed at baseline and at the eighth week of the program using a custom test...
November 2016: American Journal of Lifestyle Medicine
https://www.readbyqxmd.com/read/27883226/the-circadian-gene-clock-regulates-bone-formation-via-pdia3
#8
Gongsheng Yuan, Bingxuan Hua, Yang Yang, Lirong Xu, Tingting Cai, Ning Sun, Zuoqin Yan, Chao Lu, Ruizhe Qian
The expression patterns of clock-controlled genes (ccgs) are regulated by circadian rhythm, which is a major regulatory and physiological mechanism tied to the solar day. Disruptions in circadian rhythm contribute to the development of cardiovascular diseases, cancer, metabolic syndromes and aging. It has been reported that bone remodeling is also regulated by circadian rhythm. However, the molecular mechanism by which the circadian gene Clock regulates bone remodeling has yet to be elucidated. Here, we show that Clock mutant mice exhibit a significant reduction in bone density as well as increased apoptosis...
November 24, 2016: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/27882399/-circadian-rhythm-influence-on-epworth-sleepiness-scale-score
#9
M Herzog, A Bedorf, C Rohrmeier, T Kühnel, B Herzog, T Bremert, S Plontke, S Plößl
BACKGROUND: The Epworth Sleepiness Scale (ESS) is frequently used to determine daytime sleepiness in patients with sleep-disordered breathing. It is still unclear whether different levels of alertness induced by the circadian rhythm influence ESS score. OBJECTIVE: The aim of this study is to investigate the influence of circadian rhythm-dependent alertness on ESS performance. MATERIALS AND METHODS: In a monocentric prospective noninterventional observation study, 97 patients with suspected sleep-disordered breathing were investigated with respect to daytime sleepiness in temporal relationship to polysomnographic examination and treatment...
November 23, 2016: HNO
https://www.readbyqxmd.com/read/27871862/a-users-guide-to-hpa-axis-research
#10
REVIEW
Robert L Spencer, Terrence Deak
Glucocorticoid hormones (cortisol and corticosterone - CORT) are the effector hormones of the hypothalamic-pituitary-adrenal (HPA) axis neuroendocrine system. CORT is a systemic intercellular signal whose level predictably varies with time of day and dynamically increases with environmental and psychological stressors. This hormonal signal is utilized by virtually every cell and physiological system of the body to optimize performance according to circadian, environmental and physiological demands. Disturbances in normal HPA axis activity profiles are associated with a wide variety of physiological and mental health disorders...
November 18, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27868193/no-pattern-alteration-in-single-nocturnal-melatonin-secretion-in-patients-with-hypnic-headache-a-case-control-study
#11
Steffen Naegel, Jana-Isabel Huhn, Charly Gaul, Hans-Christoph Diener, Mark Obermann, Dagny Holle
OBJECTIVE: To investigate headache-related serum melatonin levels and melatonin excretion rhythmicity in patients with hypnic headache (HH). BACKGROUND: Strict sleep dependency of headache attacks is a pathognomonic feature of HH. Changes in melatonin levels, a marker for circadian rhythm, are assumed to play a pivotal role in the pathophysiology of HH. METHODS: Serum melatonin levels were acquired in nine patients with HH and nine age- and gender-matched healthy controls over a 20-hour time period (12 pm, 4 pm, 7 pm, 10 pm, time of headache, and 8 am)...
November 21, 2016: Headache
https://www.readbyqxmd.com/read/27867189/the-role-of-phosphate-in-kidney-disease
#12
REVIEW
Marc G Vervloet, Siren Sezer, Ziad A Massy, Lina Johansson, Mario Cozzolino, Denis Fouque
The importance of phosphate homeostasis in chronic kidney disease (CKD) has been recognized for decades, but novel insights - which are frequently relevant to everyday clinical practice - continue to emerge. Epidemiological data consistently indicate an association between hyperphosphataemia and poor clinical outcomes. Moreover, compelling evidence suggests direct toxicity of increased phosphate concentrations. Importantly, serum phosphate concentration has a circadian rhythm that must be considered when interpreting patient phosphate levels...
November 21, 2016: Nature Reviews. Nephrology
https://www.readbyqxmd.com/read/27863901/a-systematic-review-of-the-literature-on-disorders-of-sleep-and-wakefulness-in-parkinson-s-disease-from-2005-to-2015
#13
REVIEW
Lama M Chahine, Amy W Amara, Aleksandar Videnovic
Sleep disorders are among the most common non-motor manifestations in Parkinson's disease (PD) and have a significant negative impact on quality of life. While sleep disorders in PD share most characteristics with those that occur in the general population, there are several considerations specific to this patient population regarding diagnosis, management, and implications. The available research on these disorders is expanding rapidly, but many questions remain unanswered. We thus conducted a systematic review of the literature published from 2005 to 2015 on the following disorders of sleep and wakefulness in PD: REM sleep behavior disorder, insomnia, nocturia, restless legs syndrome and periodic limb movements, sleep disordered breathing, excessive daytime sleepiness, and circadian rhythm disorders...
August 31, 2016: Sleep Medicine Reviews
https://www.readbyqxmd.com/read/27861965/impact-of-the-circadian-clock-on-uv-induced-dna-damage-response-and-photocarcinogenesis
#14
Panshak Dakup, Shobhan Gaddameedhi
The skin is in constant exposure to various external environmental stressors, including solar ultraviolet (UV) radiation. Various wavelengths of UV light are absorbed by the DNA and other molecules in the skin to cause DNA damage and induce oxidative stress. The exposure to excessive ultraviolet (UV) radiation and/or accumulation of damage over time can lead to photocarcinogenesis and photoaging. The nucleotide excision repair (NER) system is the sole mechanism for removing UV photoproduct damage from DNA, and genetic disruption of this repair pathway leads to the photosensitive disorder xeroderma pigmentosum (XP)...
November 12, 2016: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/27859638/alterations-of-the-circadian-system-in-parkinson-s-disease-patients
#15
Karim Fifel
Alterations of circadian rhythms are among the most debilitating non-motor symptoms in Parkinson's Disease (PD). Although a growing awareness towards these symptoms has occurred during the last decade, their underlying neuropathophysiology remains poorly understood and consequently no effective therapeutic strategies are available to alleviate these problems. Recent studies have investigated multiple circadian rhythms at different stages of PD. The advances made have allowed an accurate evaluation of the affected underlying pathways and mechanisms...
November 15, 2016: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/27857964/women-with-postpartum-weight-retention-have-delayed-wake-times-and-decreased-sleep-efficiency-during-the-perinatal-period-a-brief-report
#16
K M Sharkey, G M Boni, J A Quattrucci, S Blatch, S N Carr
OBJECTIVE: This study assessed sleep and circadian rhythms across the perinatal period in new mothers with and without postpartum weight retention (PPWR). METHODS: Weight was measured at 2 and 16 weeks postpartum in 21 women with previous major depression or bipolar disorder (mean age 29.5±4.7 years) who self-reported pre-pregnancy weight during third trimester. Wrist actigraphy was acquired at 33 weeks gestation and postpartum weeks 2, 6, and 16. Circadian phase was measured at 33 weeks gestation and 6 weeks postpartum...
September 2016: Sleep Health
https://www.readbyqxmd.com/read/27855744/melatonin-natural-health-products-and-supplements-presence-of-serotonin-and-significant-variability-of-melatonin-content
#17
Lauren A E Erland, Praveen K Saxena
STUDY OBJECTIVES: Melatonin is an important neurohormone, which mediates circadian rhythms and the sleep cycle. As such, it is a popular and readily available supplement for the treatment and prevention of sleep-related disorders including insomnia and jet lag. This study quantified melatonin in 30 commercial supplements, comprising different brands and forms and screened supplements for the presence of serotonin. METHODS: A total of 31 supplements were analyzed by ultraperformance liquid chromatography with electrochemical detection for quantification of melatonin and serotonin...
November 14, 2016: Journal of Clinical Sleep Medicine: JCSM: Official Publication of the American Academy of Sleep Medicine
https://www.readbyqxmd.com/read/27851868/pharmacotherapies-for-sleep-disturbances-in-dementia
#18
REVIEW
Jenny McCleery, Daniel A Cohen, Ann L Sharpley
BACKGROUND: Sleep disturbances, including reduced nocturnal sleep time, sleep fragmentation, nocturnal wandering, and daytime sleepiness are common clinical problems in dementia, and are associated with significant caregiver distress, increased healthcare costs, and institutionalisation. Drug treatment is often sought to alleviate these problems, but there is significant uncertainty about the efficacy and adverse effects of the various hypnotic drugs in this vulnerable population. OBJECTIVES: To assess the effects, including common adverse effects, of any drug treatment versus placebo for sleep disorders in people with dementia, through identification and analysis of all relevant randomised controlled trials (RCTs)...
November 16, 2016: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/27846049/agomelatine-for-the-treatment-of-major-depressive-episodes-in-schizophrenia-spectrum-disorders-an-open-prospective-proof-of-concept-study
#19
Susanne Englisch, Hanna Sophie Jung, Antje Lewien, Anna Becker, Ulrike Nowak, Hanna Braun, Jascha Thiem, Sarah Eisenacher, Andreas Meyer-Lindenberg, Mathias Zink
BACKGROUND: Depressive episodes in schizophrenia constitute a major clinical problem, and treatment success is often limited by treatment-emergent side effects. Agomelatine, an agonist at melatonergic MT1/MT2 receptors and 5-HT2C receptor antagonist, is a new antidepressant with a novel mode of action which constitutes a potential therapeutic option for depression in schizophrenia. METHODS: Twenty-seven patients with lifetime diagnoses within the schizophrenia spectrum and comorbid depression were treated with agomelatine in addition to stable doses of antipsychotic agents...
October 29, 2016: Journal of Clinical Psychopharmacology
https://www.readbyqxmd.com/read/27845651/non-contact-pressure-based-sleep-wake-discrimination
#20
Lorcan Walsh, Sean McLoone, Joesph Ronda, Jeanne F Duffy, Charles A Czeisler
Poor sleep is increasingly being recognised as an important prognostic parameter of health. For those with suspected sleep disorders, patients are referred to sleep clinics which guide treatment. However, sleep clinics are not always a viable option due to their high cost, a lack of experienced practitioners, lengthy waiting lists and an unrepresentative sleeping environment. A home-based non-contact sleep/wake monitoring system may be used as a guide for treatment potentially stratifying patients by clinical need or highlighting longitudinal changes in sleep and nocturnal patterns...
October 25, 2016: IEEE Transactions on Bio-medical Engineering
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