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https://www.readbyqxmd.com/read/28345385/activation-of-5-ht1a-receptors-in-the-rat-dorsomedial-hypothalamus-inhibits-stress-induced-activation-of-the-hypothalamic-pituitary-adrenal-axis
#1
Christopher E Stamper, James E Hassell, Adam J Kapitz, Kenneth J Renner, Miles Orchinik, Christopher A Lowry
Acute activation of the hypothalamic-pituitary-adrenal (HPA) axis, leading to the release of corticosteroid hormones into the circulation, is an adaptive response to perceived threats. Persistent activation of the HPA axis can lead to impaired physiological or behavioral function with maladaptive consequences. Thus, efficient control and termination of stress responses is essential for well-being. However, inhibitory control mechanisms governing the HPA axis are poorly understood. Previous studies suggest that serotonergic systems, acting within the medial hypothalamus, play an important role in inhibitory control of stress-induced HPA axis activity...
March 27, 2017: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/28341876/consumption-of-green-tea-epigallocatechin-3-gallate-enhances-systemic-immune-response-antioxidative-capacity-and-hpa-axis-functions-in-aged-male-swiss-albino-mice
#2
Rohit Sharma, Anamika Sharma, Amita Kumari, Pankaj Markand Kulurkar, Rajneesh Raj, Ashu Gulati, Yogendra S Padwad
The present investigation assessed the potential of green tea phytochemical epigallocatechin-3-gallate (EGCG) in alleviating age-associated aberrations in immunity, hypothalamus-pituitary-adrenal (HPA) axis and redox homeostasis using 16 months old male Swiss albino mice. Four groups of animals (n = 6 per group) were supplemented with either aqueous EGCG at 25, 50 and 100 mg/kg/animal or vehicle control for 6 weeks. A concurrent analysis of CD4(+) and CD8(+) lymphocytes in splenocytes, differential leucocyte population, T cell differentiation markers in peripheral blood mononuclear cells (PBMCs), neutrophil functions, immunoglobulins profile in intestine, circulatory HPA axis hormonal levels as well as inflammatory and oxidative stress in the liver was performed...
March 24, 2017: Biogerontology
https://www.readbyqxmd.com/read/28341321/reprint-of-repeated-adolescent-activity-based-anorexia-influences-central-estrogen-signaling-and-adulthood-anxiety-like-behaviors-in-rats
#3
Tien-Jui Lee, Kimberly P Kinzig
Anorexia nervosa (AN) typically presents in adolescence and is highly comorbid with anxiety and depression, which often persist after elimination of AN symptomology. The activity-based anorexia (ABA) paradigm allows for evaluation of behavioral and neuroendocrine consequences of AN-like behaviors, including voluntary anorexia, hyperactivity, and disruption of the hypothalamic-pituitary-gonadal (HPG) and the hypothalamic pituitary adrenal (HPA) axis. Because ABA in adolescent females results in increased anxiety-like behavior in adulthood and the estrogen signaling system has been shown to play a role in anxiety and food intake, we investigated the role of ovarian hormones in adolescent ABA-treated rats, and long-term effects of mid- and late adolescent ABA exposure on behavior and estrogen signaling...
March 21, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28337596/prolactin-regulation-of-the-hpa-axis-is-not-mediated-by-a-direct-action-upon-crh-neurons-evidence-from-the-rat-and-mouse
#4
Papillon Gustafson, Ilona Kokay, Tony Sapsford, Stephen Bunn, David Grattan
Centrally acting prolactin has been shown to have anti-stress effects by modulating the activity of the hypothalamic-pituitary-adrenal axis. We tested the hypothesis that prolactin directly targets hypothalamic corticotropin-releasing hormone (CRH) neurons. In situ hybridisation confirmed expression of mRNA encoding the long, but not the short, isoform of the prolactin receptor (PRLR) within the paraventricular nucleus (PVN) of the virgin rat; however, only 6% of CRH neurons expressed long-form Prlr mRNA. Examination of the functional response of CRH neurons to intracerebroventricular prolactin (500 ng) showed that these neurons did not respond with activation of phosphorylated signal transducer and activator of transcription 5 (pSTAT5), a marker of long-form PRLR activation...
March 23, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28334933/disrupted-in-schizophrenia-1is-essential-for-normal-hypothalamic-pituitary-interrenal-hpi-axis-function
#5
Helen Eachus, Charlotte Bright, Vincent T Cunliffe, Marysia Placzek, Jonathan D Wood, Penelope J Watt
Psychiatric disorders arise due to an interplay of genetic and environmental factors, including stress. Studies in rodents have shown that mutants for Disrupted-In-Schizophrenia-1 (DISC1), a well-accepted genetic risk factor for mental illness, display abnormal behaviours in response to stress, but the mechanisms through which DISC1 affects stress responses remain poorly understood. Using two lines of zebrafish homozygous mutant for disc1, we investigated behaviour and functioning of the hypothalamic-pituitary-interrenal (HPI) axis, the fish equivalent of the hypothalamic-pituitary-adrenal (HPA) axis...
March 1, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28334512/flow-pickering-emulsion-interfaces-enhance-catalysis-efficiency-and-selectivity-for-cyclization-of-citronellal
#6
Hengquan Yang, Huan Chen, Houbing Zou, Yajuan Hao
Cyclization of citronellal is a necessary intermediate step to produce the important flavor chemical (-)-menthol. We here demonstrate a continuous flow Pickering emulsion (FPE) strategy for selective cyclization of citronellal to (-)-isopulegol, using water droplets hosting heteropolyacid catalyst (HPA) to fill a column reactor. Owing to the large liquid-liquid interface and the excellent confinement capability of droplets toward HPA, the FPE system exhibits a catalysis efficiency much higher than those of batch systems (2~5 fold) and an excellent durability (two months)...
March 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28332004/social-setting-social-rank-and-hpa-axis-response-in-cynomolgus-monkeys
#7
Vanessa A Jimenez, Daicia C Allen, Megan N McClintick, Kathleen A Grant
RATIONALE: Hypothalamic-pituitary-adrenal (HPA) axis activity under different social settings in non-human primates is understudied. OBJECTIVE: The aim of this study is to evaluate the response of pituitary-adrenal hormones (adrenocorticotropic hormone (ACTH) and cortisol) to pharmacological challenges of the HPA axis in male cynomolgus macaques under different social settings. METHODS: Male cynomolgus macaques (Macaca fascicularis, n = 11) were individually (A) and socially housed (B) in alternation, over consecutive months, in an ABA design...
March 22, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28330718/adult-glucocorticoid-receptor-mrna-expression-volatility-in-response-to-an-acute-stressor-and-juvenile-csf-corticotropin-releasing-factor-a-pilot-neurodevelopmental-study
#8
Shariful A Syed, Eric L P Smith, Olcay Batuman, Leonard A Rosenblum, Michael J Owens, Charles B Nemeroff, Jeremy D Coplan
INTRODUCTION: Early life stress (ELS) has been shown to play a role in establishing persistent maladaptive HPA axis modifications that may contribute to the pathogenesis of mood and anxiety disorders. Central glucocorticoid receptor (GR) messenger RNA (mRNA) expression may facilitate (mal)adaptive responsivity to ELS. The role of adult monocytic GR mRNA expression, a putative CNS proxy, during acute stress exposure was explored as well as the ELS marker, juvenile cerebrospinal fluid (CSF) corticotropin-releasing factor...
March 19, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28329436/prospective-evaluation-of-a-week-one-overnight-metyrapone-test-with-subsequent-dynamic-assessments-of-hypothalamic-pituitary-adrenal-axis-function-after-pituitary-surgery
#9
Katherine English, Warrick J Inder, Zara Weedon, Goce Dimeski, Jane Sorbello, Anthony W Russell, Emma L Duncan, Ross Cuneo
OBJECTIVE: To determine if an overnight metyrapone test (OMT) within the first week post pituitary surgery can definitively assess the hypothalamic-pituitary-adrenal (HPA) axis, compared with subsequent dynamic tests and glucocorticoid requirement at 6 months. DESIGN: Prospective study measuring morning cortisol levels on day 3 and 4 post-operatively, OMT day 5-7 and week 6, 250μg short Synacthen test (SST) week 6 and insulin tolerance test (ITT) week 7. PATIENTS AND MEASUREMENTS: Forty participants who underwent pituitary surgery at a single centre (Cushing's disease excluded) and were followed for at least 6 months...
March 22, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/28324498/telomere-g-overhang-length-measurement-method-2-g-tail-telomere-hpa
#10
Hidetoshi Tahara
Both telomere length and telomere G-tail length are altered in human diseases such as cancer and age-related diseases. While most methods for measurement of G-tail and telomere length require electrophoresis, centrifugation, radioisotope labeling and autoradiography, G-tail telomere HPA provides a convenient and useful tool for the examination of G-tail length with a high-throughput platform using genomic DNA or cell lysate. G-tail telomere HPA may be applicable for clinical diagnostics as well as drug target screening...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28324042/interleukin-1-antagonism-decreases-cortisol-levels-in-obese-individuals
#11
Sandrine Andrea Urwyler, Philipp Schuetz, Fahim Ebrahimi, Marc Y Donath, Mirjam Christ-Crain
Context: Increased cortisol levels in obesity may contribute to the associated metabolic syndrome. In obesity, the activated innate immune system leads to increased interleukin (IL)-1β, which is known to stimulate the release of adrenocorticotropin hormone (ACTH). Objective: We hypothesised that in obesity IL-1 antagonism would result in downregulation of the hypothalamo-pituitary-adrenal (HPA) axis, leading to decreased cortisol levels. Design and participants: In this prospective intervention study we included 73 patients with obesity (BMI >30kg/m2) and at least one additional feature of the metabolic syndrome...
February 20, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28324017/a-novel-selective-bombesin-receptor-subtype-3-agonist-promotes-weight-loss-in-male-diet-induced-obese-rats-with-circadian-rhythm-change
#12
Yasunori Nio, Natsu Hotta, Minoru Maruyama, Kenichi Hamagami, Toshimi Nagi, Masaaki Funata, Junichi Sakamoto, Masanori Nakakariya, Nobuyuki Amano, Tomohiro Okawa, Yasuyoshi Arikawa, Shinobu Sasaki, Shoki Okuda, Shizuo Kasai, Yugo Habata, Yasutaka Nagisa
Bombesin receptor subtype 3 (BRS-3) is an orphan G-protein-coupled receptor. Based on the obese phenotype of male BRS-3-deficient mice, BRS-3 has been considered an attractive target for obesity treatment. Here, we developed a novel selective BRS-3 agonist (Compound-A) and evaluated its anti-obesity effects. Compound-A showed anorectic effects and enhanced energy expenditure in diet-induced obese (DIO)-F344 rats. Moreover, repeated oral administration of Compound-A for 7 days resulted in a significant body weight reduction in DIO-F344 rats...
March 16, 2017: Endocrinology
https://www.readbyqxmd.com/read/28322762/patterns-of-stress-responses-shift-during-seasonal-life-history-transitions-an-analysis-comparing-baseline-maximal-and-integrated-corticosterone-in-female-red-sided-garter-snakes-thamnophis-sirtalis-parietalis
#13
Catherine A Dayger, Deborah I Lutterschmidt
Glucocorticoids often rise and fall with a variety of external and internal cues and frequently vary among life-history stages. This suggests that changing glucocorticoids may coordinate life-history transitions. To explore this hypothesis, we asked if the time-course of stress-induced glucocorticoid levels differ between two life-history transitions (i.e., spring and fall migration) in female red-sided garter snakes (Thamnophis sirtalis parietalis). We collected non-migratory females from a communal den and migratory females from a road along the migration route and treated them with 4 h of capture stress; plasma corticosterone was measured before, during and after capture stress...
March 18, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28321889/antihyperglycaemic-activity-of-the-methanol-extract-from-leaves-of-eremophila-maculata-scrophulariaceae-in-streptozotocin-induced-diabetic-rats
#14
Fadia S Youssef, Mohamed L Ashour, Sherif S Ebada, Mansour Sobeh, Hesham A El-Beshbishy, Abdel Nasser Singab, Michael Wink
OBJECTIVES: This study was designed to evaluate the antihyperglycaemic activity of the methanol leaf extract of Eremophila maculata (EMM) both in vitro and in vivo. METHODS: The antihyperglycaemic activity was assessed in vitro using differentiated 3T3-L1 adipocytes, whereas in-vivo effect was evaluated in streptozotocin-induced diabetic rats. Chemical profiling of EMM was done using LC-ESI-MS techniques. Molecular modelling experiments of the identified compounds were performed using C-Docker protocol...
March 21, 2017: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/28319850/methylation-of-hpa-axis-related-genes-in-men-with-hypersexual-disorder
#15
Jussi Jokinen, Adrian E Boström, Andreas Chatzittofis, Diana M Ciuculete, Katarina Görts Öberg, John N Flanagan, Stefan Arver, Helgi B Schiöth
Hypersexual Disorder (HD) defined as non-paraphilic sexual desire disorder with components of compulsivity, impulsivity and behavioral addiction, and proposed as a diagnosis in the DSM 5, shares some overlapping features with substance use disorder including common neurotransmitter systems and dysregulated hypothalamic-pituitary-adrenal (HPA) axis function. In this study, comprising 67 HD male patients and 39 male healthy volunteers, we aimed to identify HPA-axis coupled CpG-sites, in which modifications of the epigenetic profile are associated with hypersexuality...
March 10, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28319849/the-association-between-three-major-physiological-stress-systems-and-oxidative-dna-and-lipid-damage
#16
Catherine N Black, Mariska Bot, Dóra Révész, Peter G Scheffer, Brenda Penninx
BACKGROUND: Increased activity of the three major physiological stress systems (immune-inflammatory system, hypothalamic-pituitary-adrenal-axis [HPA-axis], and autonomic nervous system [ANS]) is part of the pathophysiology of various somatic and psychiatric diseases. Oxidative damage is a key mechanism in both ageing and disease. Elucidating the relationship between these stress systems and oxidative damage would contribute to the understanding of the role of physiological stress in disease...
March 6, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28319688/attenuated-dhea-and-dhea-s-response-to-acute-psychosocial-stress-in-individuals-with-depressive-disorders
#17
Xiaoling Jiang, Wen Zhong, Haiyan An, Mingyu Fu, Yuanyuan Chen, Zhenggang Zhang, Zhongju Xiao
BACKGROUND: In recent years, a relationship between depression and basal dehydroepiandrosterone (DHEA) and dehydroepiandrosterone sulfate (DHEA-S) levels has frequently been suggested, but responses of these adrenal steroids to psychosocial stress have not been examined in individuals with depressive disorders. In this study, we examined salivary DHEA, DHEA-S, and cortisol/DHEA response to the Trier Social Stress Test (TSST) in individuals with depressive disorders and in healthy controls to discover whether the responses of DHEA and DHEA-S to acute psychosocial stress could be a more sensitive marker of HPA dysfunction in depressive disorders...
March 16, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28319587/sedentary-behavior-physical-activity-and-fitness-the-maastricht-study
#18
Jeroen Hpm van der Velde, Annemarie Koster, Julianne D van der Berg, Simone Js Sep, Carla Jh van der Kallen, Pieter C Dagnelie, Miranda T Schram, Ronald Ma Henry, Simone Jpm Eussen, Martien Cjm van Dongen, Coen DA Stehouwer, Nicolaas C Schaper, Hans Hcm Savelberg
PURPOSE: This cross-sectional study examined the mutual independent associations of sedentary behavior, lower intensity physical activity (LPA) and higher intensity physical activity HPA (an approximation of moderate to vigorous physical activity (MVPA) with cardio-respiratory fitness (CRF). METHODS: 2,024 participants were included from The Maastricht Study (mean±SD age: 59.7±8.1 years, 49.6% men). With the activPAL3 activity monitor we assessed sedentary time (ST), sedentary pattern variables (number of sedentary breaks, average sedentary bout duration, and number of prolonged sedentary bouts (≥30 min)), LPA, and HPA...
March 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28318957/oceanic-meteorological-conditions-influence-incidence-of-aneurysmal-subarachnoid-hemorrhage
#19
Thierry Patrice, Bertrand Rozec, Hubert Desal, Yvonnick Blanloeil
OBJECTIVE: Publications concerning the weather pattern of occurrence of the subarachnoid hemorrhage have produced controversial results. We chose to study subarachnoid hemorrhage occurring in oceanic climate with deep variations focusing on partial oxygen volume (pO2) and patient history. METHODS: Seventy-one patients had been successively recruited from a single center 45 km from the Atlantic shore. Climate conditions had been analyzed from 72 hours before subarachnoid hemorrhage to 24 hours after...
March 15, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28315609/the-levonorgestrel-releasing-intrauterine-device-potentiates-stress-reactivity
#20
Jurate Aleknaviciute, Joke H M Tulen, Yolanda B De Rijke, Christian G Bouwkamp, Mark van der Kroeg, Mirjam Timmermans, Vincent L Wester, Veerle Bergink, Witte J G Hoogendijk, Henning Tiemeier, Elisabeth F C van Rossum, Cornelis G Kooiman, Steven A Kushner
BACKGROUND: The levonorgestrel-releasing intrauterine device (LNG-IUD) is currently recommended as a first-line contraceptive with an exclusively local intrauterine influence. However, recent clinical trials have identified side effects of LNG-IUD that appear to be systemically mediated, including depressed mood and emotional lability. METHODS: We performed two experimental studies and a cross-sectional study. For each study, women were included from three groups: LNG-IUD (0...
February 28, 2017: Psychoneuroendocrinology
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