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https://www.readbyqxmd.com/read/28108667/effects-on-circulating-steroid-hormones-and-gene-expression-along-the-hypothalamus-pituitary-gonadal-axis-in-adult-japanese-quail-exposed-to-17%C3%AE-trenbolone-across-multiple-generations
#1
Natalie K Karouna-Renier, Yu Chen, Paula F P Henry, Catherine M Maddox, Daniel T Sprague
We investigated the effects of the androgenic growth promoter 17ß-trenbolone (17βTB) on adult Japanese quail (Coturnix japonica) exposed across three generations. The F0 generation was exposed after sexual maturity to 0, 1, 5, 10, 20, and 40 ppm through feed. The F1 generation was exposed in ovo by maternal transfer and through feed at the same doses as their parents. The F2 generation was exposed in ovo only. Levels of plasma sex steroids, gonadal Cytochrome P450 aromatase (CYP19A1) mRNA and select brain neuroendocrine peptide mRNAs were measured...
January 20, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28107717/diclofenac-can-exhibit-estrogenic-modes-of-action-in-male-xenopus-laevis-and-affects-the-hypothalamus-pituitary-gonad-axis-and-mating-vocalizations
#2
Norah Johanna Efosa, Wibke Kleiner, Werner Kloas, Frauke Hoffmann
Diclofenac (DCF) is a non-steroidal analgesic and antiphlogistic. Due to its tremendous use, DCF can be found in the environment, especially in sewage, but also surface waters, ground and drinking water. Previous studies indicated that DCF can modulate the reproductive physiology of fish by altering the expression of important key enzymes of the hypothalamus-pituitary-gonad-axis (HPG-axis) and might act as an estrogenic endocrine disrupting chemical (EDC). Other studies, however, demonstrated that DCF does not exhibit any estrogenicity...
January 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28106040/the-effects-of-prior-stress-on-anxiety-like-responding-to-intra-bnst-pituitary-adenylate-cyclase-activating-polypeptide-pacap-in-male-and-female-rats
#3
S Bradley King, Kim R Lezak, Micaela O'Reilly, Donna J Toufexis, William A Falls, Karen Braas, Victor May, Sayamwong E Hammack
Chronic or repeated exposure to stressful stimuli can result in several maladaptive consequences, including increased anxiety-like behaviors and altered peptide expression in anxiety-related brain structures. Among these structures, the bed nucleus of the stria terminalis (BNST) has been implicated in emotional behaviors as well as regulation of hypothalamic-pituitary-adrenal (HPA) axis activity. In male rodents, chronic variate stress (CVS) has been shown to increase BNST pituitary adenylate cyclase activating polypeptide (PACAP) and its cognate PAC1 receptor transcript, and BNST PACAP signaling may mediate the maladaptive changes associated with chronic stress...
January 20, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28097839/nutritional-assessment-of-a-population-with-a-history-of-childhood-craniopharyngioma-seen-at-hospital-prof-dr-juan-p-garrahan
#4
Carolina Caminiti, Carola Saure, Ilanit Bomer, Mercedes Brea, Javier González Ramos
INTRODUCTION: Craniopharyngiomas are histologically benign malformations located between the pituitary and hypothalamus that may affect key hormone secretion for endocrine regulation and satiety modulation. Although this is a relatively benign disease, the combination of severe hypothalamic obesity and associated comorbidities results in a reduced quality of life. OBJECTIVE: To assess the nutritional status of patients after craniopharyngioma surgery. POPULATION AND METHODS: Patients younger than 21 years old at the time of the study who required craniopharyngioma surgery at Hospital de Pediatr...
1, 2017: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/28095431/hair-measurements-of-cortisol-dhea-and-dhea-to-cortisol-ratio-as-biomarkers-of-chronic-stress-among-people-living-with-hiv-in-china-known-group-validation
#5
Shan Qiao, Xiaoming Li, Samuele Zilioli, Zheng Chen, Huihua Deng, Juxian Pan, Weigui Guo
BACKGROUND: Existing literature suggests that endocrine measures, including the steroid hormones of cortisol and Dehydroepiandrosterone (DHEA), as well as the DHEA to cortisol ratio in the human hair can be used as promising biomarkers of chronic stress among humans. However, data are limited regarding the validity of these measures as biomarkers of chronic stress among people living with HIV (PLWH), whose endocrine system or hypothalamic pituitary adrenal (HPA) axis may be affected by HIV infection and/or antiretroviral therapy (ART) medications...
2017: PloS One
https://www.readbyqxmd.com/read/28088468/hypothalamic-effects-of-thyroid-hormone
#6
Zhi Zhang, Anita Boelen, Peter H Bisschop, Andries Kalsbeek, Eric Fliers
Thyroid hormone (TH) is a key driver of metabolism in mammals. Plasma concentrations of TH are kept within a narrow range by negative feedback regulation in the hypothalamus-pituitary-thyroid (HPT) axis. Plasma TH concentrations are an important determinant of metabolic processes in liver and brown adipose tissue (BAT). In addition to endocrine effects of TH derived from the circulation, recent studies have demonstrated additional neural routes for intrahypothalamic thyroid hormone to regulate metabolism in liver and BAT via the sympathetic and parasympathetic branch of the autonomic nervous system (ANS)...
January 11, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28078216/testosterone-replacement-therapy-role-of-pituitary-and-thyroid-in-diagnosis-and-treatment
#7
REVIEW
Megan Crawford, Laurence Kennedy
Crosstalk among hormones characterizes endocrine function, and assessment of the hypogonadal man should take that into consideration. In men for whom testosterone deficiency is a concern, initial evaluation should include a thorough history and physical exam in which other endocrinopathies are being considered. Hypogonadism can be associated with both pituitary and thyroid dysfunction, for which appropriate biochemical evaluation should be undertaken in certain clinical scenarios. If low serum testosterone is confirmed measurement of luteinizing and follicle stimulating hormones (LH and FSH respectively) is essential to establish whether the hypogonadism is primary or secondary...
December 2016: Translational Andrology and Urology
https://www.readbyqxmd.com/read/28073034/unraveling-the-different-toxic-effect-of-flufenoxuron-on-the-thyroid-endocrine-system-of-the-mongolia-racerunner-eremias-argus-at-different-stages
#8
Jing Chang, Wei Li, Baoyuan Guo, Peng Xu, Yinghuan Wang, Jianzhong Li, Huili Wang
Flufenoxuron is a widely used pesticide to inhibit the synthesis of chitin during insect development and its effect on the growth of lizards has been little addressed. The hypothalamus-pituitary-thyroid (HPT) axis plays an important role on the development of lizards. In this study, the lizards at different development stages (proliferation and resting stages) were exposed to flufenoxuron for 21 days. The plasma thyroid hormone levels, thyroid gland histopathology and expression profiles of thyroid hormone receptors (trα, trβ), deiodinases (dio1, dio2), and transthyretin (ttr) genes were measured to evaluated the toxic effect of flufenoxuron on the HPT axis at different stages...
January 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28070481/lung-adenocarcinoma-and-adrenocortical-carcinoma-in-a-patient-with-multiple-endocrine-neoplasia-type-1
#9
Nobumasa Ohara, Masanori Kaneko, Masahiro Ikeda, Fumio Ishizaki, Kazuya Suzuki, Ryo Maruyama, Takeshi Komeyama, Kazuhiro Sato, Kenichi Togashi, Hiroyuki Usuda, Yuto Yamazaki, Hironobu Sasano, Kenzo Kaneko, Kyuzi Kamoi
Multiple endocrine neoplasia type 1 (MEN1) is an autosomal dominant disorder caused by heterozygous germline mutations in the tumor suppressor gene MEN1, which encodes a nuclear protein, menin. MEN1 is characterized by the combined occurrence of tumors involving the pituitary gland, pancreatic islets, and parathyroid glands. Additionally, patients with MEN1 often exhibit adrenal tumors. Although most MEN1-associated tumors are benign, malignant lesions arising in these endocrine organs have been reported. Additionally, malignant diseases of non-endocrine organs concomitant with MEN1 have also been reported...
2017: Respiratory Medicine Case Reports
https://www.readbyqxmd.com/read/28069897/impact-of-estrogen-receptor-%C3%AE-gene-and-oxytocin-receptor-gene-polymorphisms-on-female-sexuality
#10
Anastasia K Armeni, Konstantinos Assimakopoulos, Dimitra J Marioli, Vasiliki Koika, Eftychia Michailidou, Niki Mourtzi, Gregoris Iconomou, Neoklis A Georgopoulos
Over the past decades, research attention has increasingly been paid to the neurobiological component of sexual behaviour. The aim of the present study was to investigate the correlation of estrogen receptor α (ERα) gene polymorphism (rs2234693-PvuII) (T→C substitution) and oxytocin receptor gene polymorphism (rs53576) (G→A substitution) with sexuality parameters of young, healthy women. One hundred thirty-three Greek heterosexual women, students in higher education institutions, 20-25 years of age, sexually active, with normal menstrual cycles (28-35 days), were recruited in the study...
January 9, 2017: Endocrine Connections
https://www.readbyqxmd.com/read/28062301/evolution-of-specificity-in-cartilaginous-fish-glycoprotein-hormones-and-receptors
#11
Hanna B Buechi, Jamie T Bridgham
Glycoprotein hormones (GpH) interact very specifically with their receptors to mediate hypothalamic - pituitary - peripheral gland endocrine signaling. Vertebrates typically have three functionally distinct GpH endocrine signaling complexes: follicle-stimulating hormone, luteinizing hormone, and thyroid-stimulating hormone, and their receptors. Each hormone consists of a common α subunit bound to one of three different β subunits. Individual hormone subunits and receptors are present in genomes of early metazoans, and a subset of hormone subunits and receptors has been recently characterized in sea lamprey...
January 3, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28030969/the-effects-of-trait-and-state-affect-on-diurnal-cortisol-slope-among-children-affected-by-parental-hiv-aids-in-rural-china
#12
Lihua Chen, Peilian Chi, Xiaoming Li, Samuele Zilioli, Junfeng Zhao, Guoxiang Zhao, Danhua Lin
Affect is believed to be one of the most prominent proximal psychological pathway through which more distal psychosocial factors influence physiology and ultimately health. The current study examines the relative contributions of trait affect and state affect to the hypothalamic-pituitary-adrenal axis activity, with particular focus on cortisol slope, in children affected by parental HIV/AIDS. A sample of 645 children (8-15 years old) affected by parental HIV/AIDS in rural China completed a multiple-day naturalistic salivary cortisol protocol...
December 28, 2016: AIDS Care
https://www.readbyqxmd.com/read/28030789/the-ssri-fluoxetine-exhibits-mild-effects-on-the-reproductive-axis-in-the-cichlid-fish-cichlasoma-dimerus-teleostei-cichliformes
#13
Luciana S Dorelle, Rodrigo H Da Cuña, Graciela Rey Vázquez, Christian Höcht, Akio Shimizu, Griselda Genovese, Fabiana L Lo Nostro
Among the wide variety of pharmaceuticals released into the environment, Fluoxetine (FLX), a selective serotonin reuptake inhibitor, is one of the most prescribed for the treatment of major depression. It inhibits serotonin (5-HT) reuptake at the presinaptic membrane, increasing serotonergic activity. In vertebrates, including fish, the serotonergic system is closely related to the Hypothalamic Pituitary Gonadal (HPG) axis which regulates reproduction. As FLX can act as an endocrine disrupting compound (EDC) by affecting several reproductive parameters in fish, the aim of this study was to provide an integral assessment of the potential effect of FLX on the reproductive axis of the Neotropical freshwater fish Cichlasoma dimerus...
December 25, 2016: Chemosphere
https://www.readbyqxmd.com/read/28026967/identification-of-molecular-targets-for-4-5-dichloro-2-n-octyl-4-isothiazolin-3-one-dcoit-in-teleosts-new-insight-into-mechanism-of-toxicity
#14
Lianguo Chen, Doris W T Au, Chenyan Hu, Drew R Peterson, Bingsheng Zhou, Pei-Yuan Qian
Environmental pollutants are capable of concomitantly inducing diverse toxic effects. However, it is largely unknown which effects are directly induced and which effects are secondary, thus calling for definitive identification of the initiating molecular event for a pollutant to elucidate the mechanism of toxicity. In present study, affinity pull-down assays were used to identify target proteins for 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT), a costal pollutant of emerging concern, in various tissues (e...
December 27, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/28024268/validation-of-autonomic-and-endocrine-reactivity-to-a-laboratory-stressor-in-young-children
#15
Leslie E Roos, Ryan J Giuliano, Kathryn G Beauchamp, Megan Gunnar, Brigette Amidon, Philip A Fisher
The validation of laboratory paradigms that reliably induce a stress response [including hypothalamic-pituitary-adrenal (HPA) axis and autonomic nervous system (ANS) activation], is critical for understanding how children's stress-response systems support emotional and cognitive function. Early childhood research to date is markedly limited, given the difficulty in establishing paradigms that reliably induce a cortisol response. Furthermore, research to date has not included a control condition or examined concurrent ANS reactivity...
November 29, 2016: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28018694/anterior-hypopituitarism-and-treatment-response-in-hunter-syndrome-a-comparison-of-two-patients
#16
Munier A Nour, Paola Luca, David Stephure, Xing-Chang Wei, Aneal Khan
Hypopituitarism is a clinically important diagnosis and has not previously been reported in Hunter syndrome. We contrast two cases with anatomic pituitary anomalies: one with anterior panhypopituitarism and the other with intact pituitary function. Patient 1, a 10-year-old boy with Hunter syndrome, was evaluated for poor growth and an ectopic posterior pituitary gland. Endocrine testing revealed growth hormone (GH) deficiency, secondary adrenal insufficiency, and tertiary hypothyroidism. An improvement in growth velocity with hormone replacement (GH, thyroxine, and corticosteroid) was seen; however, final adult height remained compromised...
2016: Case Reports in Pediatrics
https://www.readbyqxmd.com/read/28017731/consistent-individual-variation-in-day-night-and-gnrh-induced-testosterone-concentrations-in-house-sparrows-passer-domesticus
#17
Katie B Needham, Ned A Dochtermann, Timothy J Greives
The hypothalamic-pituitary-gonadal (HPG) axis, with gonadotropin-releasing hormone (GnRH) initiating the endocrine cascade, regulates testosterone secretion. Testosterone, through its pleiotropic effects, plays a crucial role in coordinating morphology, physiology and behavior in a reproductive context. The concentration of circulating testosterone, however, varies over the course of the day and in response to other internal or external stimuli, potentially making it difficult to relate testosterone sampled at one time point with traits of interest...
December 23, 2016: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28017596/the-role-of-the-kisspeptin-system-in-regulation-of-the-reproductive-endocrine-axis-and-territorial-behavior-in-male-side-blotched-lizards-uta-stansburiana
#18
Lorin Neuman-Lee, Timothy Grieves, Gareth R Hopkins, Susannah S French
The neuropeptide kisspeptin and its receptor are essential for activation of the hypothalamic-pituitary-gonadal (HPG) axis and regulating reproduction. While the role of kisspeptin in regulating the HPG axis in mammals has been well established, little is known about the functional ability of kisspeptins to activate the HPG axis and associated behavior in non-mammalian species. Here we experimentally examined the effects of kisspeptin on downstream release of testosterone and associated aggression and display behaviors in the side-blotched lizard (Uta stansburiana)...
December 23, 2016: Hormones and Behavior
https://www.readbyqxmd.com/read/28017195/safety-and-efficacy-of-fractionated-stereotactic-radiotherapy-and-stereotactic-radiosurgery-for-treatment-of-pituitary-adenomas-a-systematic-review-and-meta-analysis
#19
Xuezhen Li, Yanbin Li, Yang Cao, Peiliang Li, Bo Liang, Jidian Sun, Enshan Feng
Accumulated studies have not provided conclusive evidence in regards to the comparative efficacy and safety of fractionated stereotactic radiotherapy and stereotactic radiosurgery for treatment of pituitary adenomas. To address this issue, we performed a meta-analysis with eight studies identified from Medline, PubMed, Cochrane, Google Scholar, and published up to September 17, 2015. Eligible studies reported the disease control rate, endocrine cure rate (for functional adenomas), the rate of occurrence of new-onset hypopituitarism, and visual disturbance rate in patients treated with either stereotactic radiosurgery or fractionated stereotactic radiotherapy...
January 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28013034/spatiotemporal-expression-analysis-of-nuclear-estrogen-receptors-in-the-zebrafish-ovary-and-their-regulation-in-vitro-by-endocrine-hormones-and-paracrine-factors
#20
Ka-Cheuk Liu, Shuk-Wa Lau, Wei Ge
Estradiol (E2) stimulates luteinizing hormone receptor (lhcgr) expression via nuclear estrogen receptors (nERs) in the zebrafish ovary. We have demonstrated that endocrine hormones such as gonadotropin (hCG) and paracrine factors such as epidermal growth factor (EGF) and pituitary adenylate cyclase-activating peptide (PACAP) can modulate E2-induced lhcgr expression in vitro. These observations raised a question on whether these hormones and factors exert their effects via regulating the expression of nERs. In this study, we first characterized the spatiotemporal expression profiles of three nER subtypes in the zebrafish ovary, including esr1 (ERα), esr2a (ERβ2) and esr2b (ERβ1)...
December 21, 2016: General and Comparative Endocrinology
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