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https://www.readbyqxmd.com/read/30016990/high-fidelity-discrete-modeling-of-the-hpa-axis-a-study-of-regulatory-plasticity-in-biology
#1
Hooman Sedghamiz, Matthew Morris, Travis J A Craddock, Darrell Whitley, Gordon Broderick
BACKGROUND: The hypothalamic-pituitary-adrenal (HPA) axis is a central regulator of stress response and its dysfunction has been associated with a broad range of complex illnesses including Gulf War Illness (GWI) and Chronic Fatigue Syndrome (CFS). Though classical mathematical approaches have been used to model HPA function in isolation, its broad regulatory interactions with immune and central nervous function are such that the biological fidelity of simulations is undermined by the limited availability of reliable parameter estimates...
July 17, 2018: BMC Systems Biology
https://www.readbyqxmd.com/read/30012209/sick-sinus-syndrome-associated-with-anti-programmed-cell-death-1
#2
Chien-Yi Hsu, Yu-Wen Su, San-Chi Chen
BACKGROUND: Use of anti-programmed cell death-1 (anti-PD-1) has been successful in treating many types of cancers. Despite its promising efficacy, immune-related adverse events are still a major concern. Immune-related cardiotoxicity, which is rare but fatal, has recently become a focus of attention. Cardiotoxicities including myocarditis, cardiomyopathy, cardiac fibrosis, heart block and cardiac arrest have been reported. Of these toxicities, myocarditis is often accompanied by dysrhythmia...
July 16, 2018: Journal for Immunotherapy of Cancer
https://www.readbyqxmd.com/read/29998384/magic-moments-determinants-of-stress-relief-and-subjective-wellbeing-from-visiting-a-cultural-heritage-site
#3
Enzo Grossi, Giorgio Tavano Blessi, Pier Luigi Sacco
We provide an experimental evaluation of the impact of aesthetic experiences in terms of stress reduction (cortisol levels) and wellbeing increase. The test experience is a visit to the vault of the Sanctuary of Vicoforte, Italy. Data have been collected using a double step method. A structured interview in relation to the individual subjective well-being has been administered to a sample of 100 subjects. In addition, a sample of their saliva has been taken, and its cortisol level measured, before and after the experience, and likewise for momentary wellbeing measured on a Visual Analogous Scale...
July 12, 2018: Culture, Medicine and Psychiatry
https://www.readbyqxmd.com/read/29991600/separation-of-circadian-and-behavior-driven-metabolite-rhythms-in-humans-provides-a-window-on-peripheral-oscillators-and-metabolism
#4
Debra J Skene, Elena Skornyakov, Namrata R Chowdhury, Rajendra P Gajula, Benita Middleton, Brieann C Satterfield, Kenneth I Porter, Hans P A Van Dongen, Shobhan Gaddameedhi
Misalignment between internal circadian rhythmicity and externally imposed behavioral schedules, such as occurs in shift workers, has been implicated in elevated risk of metabolic disorders. To determine underlying mechanisms, it is essential to assess whether and how peripheral clocks are disturbed during shift work and to what extent this is linked to the central suprachiasmatic nuclei (SCN) pacemaker and/or misaligned behavioral time cues. Investigating rhythms in circulating metabolites as biomarkers of peripheral clock disturbances may offer new insights...
July 10, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29986391/hair-testosterone-and-cortisol-concentrations-in-pre-and-post-rut-roe-deer-bucks-correlations-with-blood-levels-and-testicular-morphometric-parameters
#5
Domenico Ventrella, Alberto Elmi, Francesca Barone, Giacomo Carnevali, Nadia Govoni, Maria Laura Bacci
The roe deer is a seasonally breeding species with a reproductive cycle regulated by endogenous rhythms and photoperiod-sensitivity. Sexually mature bucks show hormonal and testicular activation during the reproductive season, with a peak in the rut period, and following gradual involution. Hair is a good matrix for non-invasive endocrinological analyses that provide long-term information without being influenced by the hormones’ pulsating release patterns in blood. The aim of the work was to quantify hair concentrations of testosterone and cortisol in wild roe deer bucks hunted during the pre- and post-rut period, using a radioimmunoassay methodology, and to look for differences between the two periods...
July 6, 2018: Animals: An Open Access Journal From MDPI
https://www.readbyqxmd.com/read/29983354/movement-profile-influences-systemic-stress-and-biomechanical-resilience-to-high-training-load-exposure
#6
Barnett S Frank, Anthony C Hackney, Claudio L Battaglini, Troy Blackburn, Stephen W Marshall, Micheal Clark, Darin A Padua
OBJECTIVES: Determine the influence of movement profile on systemic stress and mechanical loading before and after high training load exposure. DESIGN: Cross-sectional cohort study. METHODS: 43 physically active, college-aged field or court sport female athletes participated in this study. Participants were assigned to a "excellent" (n=22; age=20.5±1.9yrs, height=1.67±0.67m, mass=64.5±7.8kg) or "poor" (n=21; age=20.4±1...
May 25, 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29982075/label-free-quantitative-proteomic-analysis-reveals-muscle-contraction-and-metabolism-proteins-linked-to-ultimate-ph-in-bovine-skeletal-muscle
#7
Mirele Daiana Poleti, Cristina Tschorny Moncau, Bárbara Silva-Vignato, Alessandra Fernandes Rosa, Adalfredo Rocha Lobo, Thaís Regiani Cataldi, João Alberto Negrão, Saulo L Silva, Joanir Pereira Eler, Júlio César de Carvalho Balieiro
The purpose of this research was to investigate the causes and consequences of pHu variations in beef cattle. A group of 176 Nellore beef cattle was evaluated and classified into two different pHu groups: High (≥6.0, N = 17) and Normal (<5.8, N = 159). Plasma concentrations of cortisol and adrenocorticotropic hormone, lactate and glycogen muscular content, meat color, shear force and Longissimus thoracis muscle proteomic profile were evaluated and compared between pHu groups. Muscle glycogen content, meat color and shear force statistically differed between pHu groups...
June 30, 2018: Meat Science
https://www.readbyqxmd.com/read/29956833/reproductive-cycling-in-adult-baboons-papio-species-that-were-intrauterine-growth-restricted-at-birth-implies-normal-fertility-but-increased-psychosocial-stress
#8
Hillary F Huber, McKenna M Considine, Susan Jenkins, Cun Li, Peter W Nathanielsz
We investigated menstrual cycles in intrauterine growth restricted (IUGR, 7-10 years, n = 8) and age-matched control (n = 10) baboons. Cycle duration and plasma anti-Mullerian hormone were similar. IUGR spent more days per cycle swollen and had elevated early morning fasted serum cortisol, suggesting normal fertility in the presence of increased psychosocial stress.
June 29, 2018: Journal of Medical Primatology
https://www.readbyqxmd.com/read/29953265/biological-rhythms-chronodisruption-and-chrono-enhancement-the-role-of-physical-activity-as-synchronizer-in-correcting-steroids-circadian-rhythm-in-metabolic-dysfunctions-and-cancer
#9
Jacopo Antonino Vitale, Giovanni Lombardi, Andi Weydahl, Giuseppe Banfi
Rhythms can be observed at all levels of the biologic integration in humans. The observation that a biological or physiological variable shows a circadian rhythm can be explained by several multifactorial systems including external (exogenous), internal (endogenous) and psychobiological (lifestyle) mechanisms. Our body clock can be synchronized with the environment by external factors, called "synchronizers", i.e. the light-dark cycle, but it is also negatively influenced by some pathological conditions or factors, called "chronodisruptors," i...
June 28, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29946297/chronic-insufficient-sleep-has-a-limited-impact-on-circadian-rhythmicity-of-subjective-hunger-and-awakening-fasted-metabolic-hormones
#10
Andrew W McHill, Joseph T Hull, Ciaran J McMullan, Elizabeth B Klerman
Weight gain and obesity have reached epidemic proportions in modern society. Insufficient sleep-which is also prevalent in modern society-and eating at inappropriate circadian times have been identified as risk factors for weight gain, yet the impact of chronic insufficient sleep on the circadian timing of subjective hunger and physiologic metabolic outcomes are not well understood. We investigated how chronic insufficient sleep impacts the circadian timing of subjective hunger and fasting metabolic hormones in a 32-day in-laboratory randomized single-blind control study, with healthy younger participants (range, 20-34 years) randomized to either Control (1:2 sleep:wake ratio, 6...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29913172/physiological-impacts-of-housing-maned-wolves-chrysocyon-brachyurus-with-female-relatives-or-unrelated-males
#11
Marieke K Jones, Lauren E Reiter, Michael P Gilmore, Elizabeth W Freeman, Nucharin Songsasen
The maned wolf is a threatened canid species native to South America. Previous studies have suggested the species exhibits induced ovulation. In captive breeding facilities, reproductive success is low while rates of neonatal mortality are high. Females that are not recommended for breeding are frequently housed together. However there has never been a systematic study of the reproductive consequences of co-housing females. This study was conducted for three purposes, to: (1) corroborate the presence of induced ovulation, (2) determine whether elevated cortisol is implicated in neonatal pup mortality, and (3) evaluate the endocrine correlates of group housed females...
June 15, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29896314/mental-stress-as-consequence-and-cause-of-vision-loss-the-dawn-of-psychosomatic-ophthalmology-for-preventive-and-personalized-medicine
#12
REVIEW
Bernhard A Sabel, Jiaqi Wang, Lizbeth Cárdenas-Morales, Muneeb Faiq, Christine Heim
The loss of vision after damage to the retina, optic nerve, or brain has often grave consequences in everyday life such as problems with recognizing faces, reading, or mobility. Because vision loss is considered to be irreversible and often progressive, patients experience continuous mental stress due to worries, anxiety, or fear with secondary consequences such as depression and social isolation. While prolonged mental stress is clearly a consequence of vision loss, it may also aggravate the situation. In fact, continuous stress and elevated cortisol levels negatively impact the eye and brain due to autonomous nervous system (sympathetic) imbalance and vascular dysregulation; hence stress may also be one of the major causes of visual system diseases such as glaucoma and optic neuropathy...
June 2018: EPMA Journal
https://www.readbyqxmd.com/read/29894840/slow-wave-sleep-and-androgens-selective-slow-wave-sleep-suppression-affects-testosterone-and-17%C3%AE-hydroxyprogesterone-secretion
#13
Yu V Ukraintseva, K M Liaukovich, А A Polishchuk, О V Martynova, D A Belov, E S Simenel, М Meira E Cruz, А N Nizhnik
OBJECTIVES: Levels of steroid hormones such as androgens and cortisol exhibit circadian variation, and their fluctuations are related to the sleep-wake cycle. Currently, the functional role of different stages of sleep in steroid hormone secretion remains unclear. The present study aims to explore the effect of slow-wave sleep (SWS) suppression on morning levels of cortisol and androgens. METHODS: Twelve healthy male volunteers participated in two experimental sessions: a session with selective SWS suppression during night sleep and a session with regular night sleep (control)...
August 2018: Sleep Medicine
https://www.readbyqxmd.com/read/29894760/circadian-rhythms-of-melatonin-and-behaviour-in-juvenile-sheep-in-field-conditions-effects-of-photoperiod-environment-and-weaning
#14
C A Wyse, X Zhang, M McLaughlin, S M Biello, D Hough, M Bellingham, A M Curtis, J E Robinson, N P Evans
Entrainment of circadian rhythms (CR) to the light dark cycle has been well described under controlled, experimental conditions. However, studies in rodents have reported that rhythms in the laboratory are not always reproduced under field conditions. The aim of this study was to characterise the CR of sheep maintained under conditions of standard UK farm animal husbandry and to investigate the effects of environmental challenges presented by season, weaning and changes in housing on CR. Male sheep (n = 9) were kept at pasture, or group housed in barns, under natural photoperiod for one year...
June 15, 2018: Physiology & Behavior
https://www.readbyqxmd.com/read/29769824/immune-response-in-women-during-exercise-in-the-heat-a-spotlight-on-oral-contraception
#15
Brianna Larsen, Amanda J Cox, Karlee Quinn, Rhiannon Fisher, Clare Minahan
This study compared the immune and stress response of oral contraceptive users (WomenOC; n = 9) to normally-menstruating women (WomenNM; n = 9) at rest and during exercise in temperate (TEMP; 22°C) and hot (HEAT; 35°C) conditions. Participants performed a 3-stage cycling trial in each condition at 90% (Stage 1; 30 min), 135% (Stage 2; 15 min), and 180% (Stage 3; 7.5 min) of lactate threshold 1. C-reactive protein (CRP) and immune cell counts were measured at rest, and serum cytokines (IL-1β, IL-1RA, IL-6, IL-8, IL-10, and TNF-α) and salivary cortisol were evaluated before and after exercise in both the TEMP and HEAT conditions...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29760304/metyrapone-responsive-ectopic-acth-secreting-pheochromocytoma-with-a-vicious-cycle-via-a-glucocorticoid-driven-positive-feedback-mechanism
#16
Minako Inoue, Ken Okamura, Chie Kitaoka, Fumio Kinoshita, Ryo Namitome, Udai Nakamura, Masaki Shiota, Kenichi Goto, Toshio Ohtsubo, Kiyoshi Matsumura, Yoshinao Oda, Masatoshi Eto, Takanari Kitazono
In ectopic ACTH-secreting pheochromocytoma, combined ACTH-driven hypercortisolemia and hyper-catecholaminemia are serious conditions, which can be fatal if not diagnosed and managed appropriately, especially when glucocorticoid-driven positive feedback is suggested with a high ACTH/cortisol ratio. A 46-year-old man presented with headache, rapid weight loss, hyperhidrosis, severe hypertension and hyperglycemia without typical Cushingoid appearance. Endocrinological examinations demonstrated elevated plasma and urine catecholamines, serum cortisol and plasma ACTH...
May 15, 2018: Endocrine Journal
https://www.readbyqxmd.com/read/29755146/stigma-consciousness-modulates-cortisol-reactivity-to-social-stress-in-women
#17
David Matthew Doyle, Lisa Molix
The aim of the current study was to examine whether stigma consciousness shapes cortisol responses to social stress among women in the lab. Undergraduate women ( N = 45) completed background measures and then participated in a public speaking task, with assessments of cortisol prior to the stressor as well as 20- and 40-minutes post stressor onset. Results from multilevel models revealed that women higher in stigma consciousness evidenced blunted cortisol reactivity following social stress across the study session compared to women lower in stigma consciousness...
March 2018: European Journal of Social Psychology
https://www.readbyqxmd.com/read/29743827/the-effect-of-carbohydrate-mouth-rinse-on-performance-biochemical-and-psychophysiological-variables-during-a-cycling-time-trial-a-crossover-randomized-trial
#18
Amanda M J Ferreira, Luiz F Farias-Junior, Thaynan A A Mota, Hassan M Elsangedy, Aline Marcadenti, Telma M A M Lemos, Alexandre H Okano, Ana P T Fayh
Background: The hypothesis of the central effect of carbohydrate mouth rinse (CMR) on performance improvement in a fed state has not been established, and its psychophysiological responses have not yet been described. The aim of this study was to evaluate the effect of CMR in athletes fed state on performance, biochemical and psychophysiological responses compared to ad libitum water intake. Methods: Eleven trained male cyclists completed a randomized, crossover trial, which consisted of a 30 km cycle ergometer at self-selected intensity and in a fed state...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29737878/involvement-of-cortisol-and-sirtuin1-during-the-response-to-stress-of-hypothalamic-circadian-system-and-food-intake-related-peptides-in-rainbow-trout-oncorhynchus-mykiss
#19
Fatemeh Naderi, Juan Hernández-Pérez, Mauro Chivite, José L Soengas, Jesús M Míguez, Marcos A López-Patiño
Stress is conditioning animal welfare by negatively affecting a wide range of physiological and behavioral functions. This may be applied to circadian physiology and food intake. Cortisol, the stress-related hormone, may mediate such effect of stress, but other indirect mediators might be considered, such as sirtuin1. Then, either the independent modulatory effect or the existence of any interaction between mediators may be responsible. The circadian system is the main modulator of several integrative mechanisms at both central and peripheral levels that are rhythmically presented, thus influencing different processes such as food intake...
May 8, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29678493/analysis-and-validation-of-a-new-extended-method-for-estimating-plasma-free-cortisol-including-neutrophil-elastase-and-competition-from-other-steroids
#20
Johanne Gudmand-Hoeyer, Johnny T Ottesen
A non-linear mechanistic model for the distribution of cortisol in plasma on free and bound forms is proposed. The influence of progesterone, testosterone and neutrophil elastase on the cortisol distribution in the blood is investigated. The activity of neutrophil elastase is directly included in the model with the concentration of elastase and the kinetic constants describing the activity of elastase collected in one single input variable. The model is very sensitive towards this input variable and fits data excellently, when it is allowed to be subject specific...
July 2018: Journal of Steroid Biochemistry and Molecular Biology
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