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https://www.readbyqxmd.com/read/27932681/acute-intermittent-hypoxia-in-rats-activates-muscle-proteolytic-pathways-through-a-glucocorticoid-dependent-mechanism
#1
Franciele Przygodda, Leandro Henrique Manfredi, Juliano Machado, Dawit A P Gonçalves, Neusa Maria Zanon, Leni G H Bonagamba, Benedito H Machado, Isis do Carmo Kettelhut, Luiz C C Navegantes
Although it is well known that chronic hypoxia induces muscle wasting, the effects of intermit-tent hypoxia on skeletal muscle protein metabolism remains unclear. We hypothesized that acute intermittent hypoxia (AIH), a challenge that activates the hypothalamic-pituitary-adrenal axis, would alter muscle protein homeostasis through a glucocorticoid-dependent mechanism. Three-week-old rats were submitted to adrenalectomy (ADX) and exposed to 8 h of AIH (6% O2 for 40s at 9 min intervals). Animals were sacrificed and the soleus and extensor digitorum longus (EDL) muscles were harvested and incubated in vitro for measurements of protein turn-over...
December 8, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27932530/affective-alterations-in-patients-with-cushing-s-syndrome-in-remission-are-associated-with-decreased-bdnf-and-cortisone-levels
#2
E Valassi, I Crespo, B G Keevil, A Aulinas, E Urgell, A Santos, P J Trainer, S M Webb
OBJECTIVE: Affective alterations and poorer quality of life often persist in patients with Cushing's syndrome (CS) in remission. Brain-derived neurotrophic factor (BDNF) regulates the hypothalamic-pituitary-adrenal axis (HPA) and is highly expressed in brain areas controlling mood and response to stress. Our aims were to assess affective alterations after long-term remission of CS and evaluate whether they are associated with serum BDNF, salivary cortisol (SalF) and/or cortisone (SalE) concentrations...
February 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/27930953/adolescent-binge-alcohol-exposure-increases-risk-assessment-behaviors-in-male-wistar-rats-after-exposure-to-an-acute-psychological-stressor-in-adulthood
#3
Audrey Torcaso, AnnaDorothea Asimes, Margaret Meagher, Toni R Pak
Teenage binge drinking is a common practice that has been shown to increase the risk for developing mood disorders in adulthood. The hypothalamo-pituitary-adrenal (HPA) axis is often dysfunctional in mood disorder patients, and animal models of adolescent binge alcohol exposure similarly show disordered HPA axis function, even after long periods of alcohol abstinence. Here, we sought to investigate the anxiety-like behavioral consequences of binge alcohol exposure in a Wistar rat model. Male rats were administered alcohol in a binge pattern during peri-puberty, and one month later, anxiety-like behaviors were measured using the elevated plus maze...
November 30, 2016: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/27930715/apparent-hypothalamic-pituitary-adrenal-axis-suppression-via-reduction-of-interleukin-6-by-glucocorticoid-therapy-in-systemic-autoimmune-diseases
#4
Natsuki Fujio, Shotaro Masuoka, Kotaro Shikano, Natsuko Kusunoki, Toshihiro Nanki, Shinichi Kawai
CONTEXT: Suppression of the hypothalamic-pituitary-adrenal (HPA) axis is a serious complication of systemic glucocorticoid therapy. OBJECTIVE: To clarify the influence of proinflammatory cytokines on the HPA axis after onset of glucocorticoid therapy in patients with systemic autoimmune diseases. PATIENTS AND METHODS: Forty-eight glucocorticoid-naïve patients with systemic autoimmune diseases (28 women) who were starting prednisolone therapy according to our standard regimens were prospectively observed...
2016: PloS One
https://www.readbyqxmd.com/read/27929385/the-metabolic-implications-of-glucocorticoids-in-a-high-fat-diet-setting-and-the-counter-effects-of-exercise
#5
REVIEW
Emily C Dunford, Michael C Riddell
Glucocorticoids (GCs) are steroid hormones, naturally produced by activation of the hypothalamic-pituitary-adrenal (HPA) axis, that mediate the immune and metabolic systems. Synthetic GCs are used to treat a number of inflammatory conditions and diseases including lupus and rheumatoid arthritis. Generally, chronic or high dose GC administration is associated with side effects such as steroid-induced skeletal muscle loss, visceral adiposity, and diabetes development. Patients who are taking exogenous GCs could also be more susceptible to poor food choices, but the effect that increasing fat consumption in combination with elevated exogenous GCs has only recently been investigated...
December 5, 2016: Metabolites
https://www.readbyqxmd.com/read/27928434/adrenalectomy-for-cushing-s-syndrome-do-s-and-don-ts
#6
REVIEW
Paduraru Dn, Nica A, Carsote M, Valea A
Aim. To present specific aspects of adrenalectomy for Cushing's syndrome (CS) by introducing well established aspects ("do's") and less known aspects ("don'ts"). Material and Method. This is a narrative review. Results. The "do's" for laparoscopic adrenalectomy (LA) are the following: it represents the "gold standard" for secretor and non-secretor adrenal tumors and the first line therapy for CS with an improvement of cardio-metabolic co-morbidities; the success rate depending on the adequate patients' selection and the surgeon's skills...
October 2016: Journal of Medicine and Life
https://www.readbyqxmd.com/read/27925794/endocrine-and-emotional-response-to-exclusion-among-women-and-men-cortisol-salivary-alpha-amylase-and-mood
#7
Liat Helpman, Julia Penso, Orna Zagoory-Sharon, Ruth Feldman, Eva Gilboa-Schechtman
BACKGROUND AND OBJECTIVES: Social exclusion is ubiquitous and painful. Evolutionary models indicate sex differences in coping with social stress. Recent empirical data suggests different sex patterns in hypothalamic-pituitary-adrenal (HPA) and sympathetic-adrenal-medullary (SAM) reactivity. The present study sought to test this hypothesis. DESIGN: We examined differences in endocrine and emotional response to exclusion by using a virtual ball tossing paradigm (Cyberball)...
December 7, 2016: Anxiety, Stress, and Coping
https://www.readbyqxmd.com/read/27924137/exercise-induced-stress-behavior-gut-microbiota-brain-axis-and-diet-a-systematic-review-for-athletes
#8
REVIEW
Allison Clark, Núria Mach
Fatigue, mood disturbances, under performance and gastrointestinal distress are common among athletes during training and competition. The psychosocial and physical demands during intense exercise can initiate a stress response activating the sympathetic-adrenomedullary and hypothalamus-pituitary-adrenal (HPA) axes, resulting in the release of stress and catabolic hormones, inflammatory cytokines and microbial molecules. The gut is home to trillions of microorganisms that have fundamental roles in many aspects of human biology, including metabolism, endocrine, neuronal and immune function...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27923708/acth-modulation-on-corticosterone-melatonin-testosterone-and-innate-immune-response-in-the-tree-frog-hypsiboas-faber
#9
Adriana Maria Giorgi Barsotti, Vania Regina de Assis, Stefanny Christie Monteiro Titon, Braz Titon Junior, Zulma Felisbina da Silva Ferreira, Fernando Ribeiro Gomes
The modulation exerted by glucocorticoids in physiological responses to stressors is essential for maintaining short-term homeostasis. However, highly frequent and/or prolonged activation of the hypothalamic-pituitary-adrenal/interrenal axis may inhibit processes that are important to long-term fitness and health, including reproduction and immunocompetence. The present study evaluates the response to adrenocorticotropic hormone (ACTH) injection in the adult male tree frog, Hypsiboas faber, as indicated by levels of plasma corticosterone (CORT), plasma testosterone (T), ocular melatonin (MEL), hematocrit and immune functioning (total leukocyte count and bacterial killing ability against Escherichia coli)...
December 3, 2016: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/27923182/sociodemographic-lifestyle-and-psychosocial-determinants-of-hair-cortisol-in-a-south-london-community-sample
#10
Susanne Fischer, Roman Duncko, Stephani L Hatch, Andrew Papadopoulos, Laura Goodwin, Souci Frissa, Matthew Hotopf, Anthony J Cleare
OBJECTIVE: Hypothalamic-pituitary-adrenal (HPA) measures are crucial for research into stress and stress-related disorders. Most HPA measures fluctuate depending on diurnal rhythms and state confounders. Hair cortisol concentrations (HCC) are less susceptible to such fluctuations, but less is known about trait-like confounders. Using a community sample, we tested the relationship between HCC and a range of variables including demographic variables, hair treatment, and medication, as well as psychosocial variables, namely childhood trauma, critical life events, and depressive symptoms...
November 17, 2016: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/27922635/increased-plasma-levels-of-circulating-cell-free-mitochondrial-dna-in-suicide-attempters-associations-with-hpa-axis-hyperactivity
#11
D Lindqvist, J Fernström, C Grudet, L Ljunggren, L Träskman-Bendz, L Ohlsson, Å Westrin
Preclinical data suggest that chronic stress may cause cellular damage and mitochondrial dysfunction, potentially leading to the release of mitochondrial DNA (mtDNA) into the bloodstream. Major depressive disorder has been associated with an increased amount of mtDNA in leukocytes from saliva samples and blood; however, no previous studies have measured plasma levels of free-circulating mtDNA in a clinical psychiatric sample. In this study, free circulating mtDNA was quantified in plasma samples from 37 suicide attempters, who had undergone a dexamethasone suppression test (DST), and 37 healthy controls...
December 6, 2016: Translational Psychiatry
https://www.readbyqxmd.com/read/27921430/-obstructive-sleep-apnoea-and-type-2-diabetes-mellitus
#12
Andrea Plíhalová, Kateřina Westlake, Jan Polák
Obstructive sleep apnoea syndrome (OSA) is a disease very frequently occurring in people with type 2 diabetes, that significantly increases cardiovascular morbidity and mortality. In a number of studies, OSA has been identified as an independent risk factor for the development of insulin resistance, glucose intolerance and type 2 diabetes mellitus. Disorders of glucose homeostasis in patients with OSA are probably mediated by chronic intermittent hypoxia and/or sleep fragmentation through activation of the sympathetic nervous system, the hypothalamic-pituitary-adrenal stress axis, pro-inflammatory paths or oxidative stress...
2016: Vnitr̆ní Lékar̆ství
https://www.readbyqxmd.com/read/27917115/switching-adolescent-high-fat-diet-to-adult-control-diet-restores-neurocognitive-alterations
#13
Chloé Boitard, Shauna L Parkes, Amandine Cavaroc, Frédéric Tantot, Nathalie Castanon, Sophie Layé, Sophie Tronel, Gustavo Pacheco-Lopez, Etienne Coutureau, Guillaume Ferreira
In addition to metabolic and cardiovascular disorders, obesity is associated with adverse cognitive and emotional outcomes. Its growing prevalence in adolescents is particularly alarming since this is a period of ongoing maturation for brain structures (including the hippocampus and amygdala) and for the hypothalamic-pituitary-adrenal (HPA) stress axis, which is required for cognitive and emotional processing. We recently demonstrated that adolescent, but not adult, high-fat diet (HF) exposure leads to impaired hippocampal function and enhanced amygdala function through HPA axis alteration (Boitard et al...
2016: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/27916659/stronger-hypothalamus-pituitary-adrenal-axis-habituation-predicts-lesser-sensitization-of-inflammatory-response-to-repeated-acute-stress-exposures-in-healthy-young-adults
#14
Myriam V Thoma, Danielle Gianferante, Luke Hanlin, Alexander Fiksdal, Chen Xuejie, Nicolas Rohleder
Effective adjustment of the stress systems to repeated stress is regarded as an adaptive response of the organism facing environmental threats. Given the intertwined relationship between the stress systems and the inflammatory system, it could be expected that inflammatory processes should adapt to repeated stress as well. However, only little is known about adaptational processes of the different components of the immune system in response to repeated stress, and how these might be related to adaptational processes of the hypothalamus-pituitary-adrenal (HPA) axis...
December 1, 2016: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/27916140/moderate-alcohol-consumption-after-a-mental-stressor-attenuates-the-endocrine-stress-response
#15
I C Schrieks, M M Joosten, W A A Klöpping-Ketelaars, R F Witkamp, H F J Hendriks
Alcohol is often consumed to reduce tension and improve mood when exposed to stressful situations. Previous studies showed that moderate alcohol consumption may reduce stress when alcohol is consumed prior to a stressor, but data on the effect of alcohol consumption after a mental stressor is limited. Therefore, our objective was to study whether moderate alcohol consumption immediately after a mental stressor attenuates the stress response. Twenty-four healthy men (age 21-40 y, BMI 18-27 kg/m(2)) participated in a placebo-controlled trial...
December 2016: Alcohol
https://www.readbyqxmd.com/read/27914245/perinatal-hypothalamic-pituitary-adrenal-axis-regulation-among-women-with-eating-disorders-and-their-infants
#16
A Easter, E Taborelli, A Bye, P A Zunszain, C M Pariante, J Treasure, U Schmidt, N Micali
BACKGROUND: Psychiatric illness is associated with heightened hypothalamic-pituitary-adrenal (HPA) axis activity during pregnancy which may have long term effects on infant stress regulation. HPA axis regulation has not previously been investigated in women with eating disorders (ED) or their infants during the perinatal period. METHODS: Women were recruited to a prospective longitudinal study in three groups: 1) current or active ED (C-ED=31), 2) past ED (P-ED=29) and healthy control (HC=57)...
November 11, 2016: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/27908897/cortisol-as-a-predictor-of-psychological-therapy-response-in-depressive-disorders-systematic-review-and-meta-analysis
#17
REVIEW
Susanne Fischer, Rebecca Strawbridge, Andres Herane Vives, Anthony J Cleare
BACKGROUND: Many patients with depressive disorders demonstrate resistance to psychological therapy. A frequent finding is hypothalamic-pituitary-adrenal (HPA) axis alterations. As cortisol is known to modulate cognitive processes, those patients may be less likely to profit from psychological therapy. AIMS: To conduct a systematic review and meta-analysis on cortisol as a predictor of psychological therapy response. METHOD: The Cochrane Library, EMBASE, MEDLINE and PsycINFO databases were searched...
December 1, 2016: British Journal of Psychiatry: the Journal of Mental Science
https://www.readbyqxmd.com/read/27908768/acute-stress-diminishes-m-current-contributing-to-elevated-activity-of-hypothalamic-pituitary-adrenal-axis
#18
Jing-Jing Zhou, Yonggang Gao, Therese A Kosten, Zongmao Zhao, De-Pei Li
Acute stress stimulates corticotrophin-releasing hormone (CRH)-expressing neurons in the hypothalamic paraventricular nucleus (PVN), which is an essential component of hypothalamic-pituitary-adrenal (HPA) axis. However, the cellular and molecular mechanisms remain unclear. The M-channel is a voltage-dependent K(+) channel involved in stabilizing the neuronal membrane potential and regulating neuronal excitability. In this study, we tested our hypothesis that acute stress suppresses expression of Kv7 channels to stimulate PVN-CRH neurons and the HPA axis...
November 28, 2016: Neuropharmacology
https://www.readbyqxmd.com/read/27907849/association-between-dehydroepiandrosterone-sulfate-and-attention-in-long-term-survivors-of-childhood-acute-lymphoblastic-leukemia-treated-with-only-chemotherapy
#19
Yin Ting Cheung, Wassim Chemaitilly, Daniel A Mulrooney, Tara M Brinkman, Wei Liu, Pia Banerjee, Deokumar Srivastava, Ching-Hon Pui, Leslie L Robison, Melissa M Hudson, Kevin R Krull
Long-term survivors of childhood acute lymphoblastic leukemia (ALL) are at risk for neurocognitive impairment, as well as compromised hypothalamic-pituitary-adrenal (HPA) function. Dehydroepiandrosterone-sulfate (DHEAS) is an adrenal androgen commonly used as a marker of HPA function. In the general population, a low level of DHEAS has been associated with poorer cognition. At ≥2years post-treatment, we examined the association of DHEAS with attention outcomes in 35 male and 34 female long-term survivors of childhood ALL (mean[standard deviation] age at evaluation 14...
November 16, 2016: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/27907151/changes-in-galanin-systems-in-a-rat-model-of-post-traumatic-stress-disorder-ptsd
#20
Karen Barnabas, Lin Zhang, Huiying Wang, Gilbert Kirouac, Maria Vrontakis
Post-traumatic stress disorder (PTSD) is a chronic syndrome triggered by exposure to trauma and a failure to recover from a normal negative emotional reaction to traumatic stress. The neurobiology of PTSD and the participation of neuropeptides in the neural systems and circuits that control fear and anxiety are not fully understood. The long-term dysregulation of neuropeptide systems contributes to the development of anxiety disorders, including PTSD. The neuropeptide galanin (Gal) and its receptors participate in anxiety-like and depression-related behaviors via the modulation of neuroendocrine and monoaminergic systems...
2016: PloS One
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