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Journal of Endocrinology

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https://www.readbyqxmd.com/read/28096436/angiotensin-ii-induces-differential-insulin-action-in-rat-skeletal-muscle
#1
Juthamard Surapongchai, Mujalin Prasannarong, Tepmanas Bupha-Intr, Vitoon Saengsirisuwan
Angiotensin II (ANGII) is reportedly involved in the development of skeletal muscle insulin resistance. The present investigation evaluated the effects of two ANGII doses on the phenotypic characteristics of insulin resistance syndrome and insulin action and signaling in rat skeletal muscle. Male Sprague-Dawley rats were infused with either saline (SHAM) or ANGII at a commonly used pressor dose (100 ng/kg/min; ANGII-100) or a higher pressor dose (500 ng/kg/min; ANGII-500) via osmotic minipumps for 14 days. We demonstrated that ANGII-100-infused rats exhibited the phenotypic features of non-obese insulin resistance syndrome, including hypertension, impaired glucose tolerance and insulin resistance of glucose uptake in the soleus muscle, whereas ANGII-500-treated rats exhibited diabetes-like symptoms, such as post-prandial hyperglycemia, impaired insulin secretion and hypertriglyceridemia...
January 17, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28096435/regulation-of-aldosterone-secretion-by-mineralocorticoid-receptor-mediated-signaling
#2
Cherish Chong, Anis Hamid, Tham Yao, Amanda Garza, Luminita Pojoga, Gail K Adler, Jose R Romero, Gordon H Williams
We posit the existence of a paracrine/autocrine negative feedback loop, mediated by the mineralocorticoid receptor (MR), regulating aldosterone secretion. To assess this hypothesis we asked whether altering MR activity in zona glomerulosa (ZG) cells affects aldosterone production. To this end, we studied ex vivo ZG cells isolated from male Wistar rats fed chow containing either high (1.6% Na+ [HS]) or low (0.03% Na+ [LS]) amount of sodium. Western blot analyses demonstrated that MR was present in both the ZG and zona fasciculata/zona reticularis (ZF/ZR/ZR)...
January 17, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28096434/precocious-glucocorticoid-exposure-reduces-skeletal-muscle-satellite-cells-in-the-fetal-rat
#3
Ganga Gokulakrishnan, Xiaoyan Chang, Ryan Fleischmann, Marta Fiorotto
Perinatal skeletal muscle growth rates are a function of protein and myonuclear accretion. Precocious exposure of the fetus to glucocorticoids (GLC) in utero impairs muscle growth. Reduced muscle protein synthesis rates contribute to this response, but the consequences for myonuclear hyperplasia are unknown. To test the hypothesis that blunting of Pax7+ muscle progenitor cell proliferative activity by GLC in vivo also contributes to reduced fetal muscle growth, pregnant rats were administered dexamethasone (DEX;1 mg/L drinking water) from embryonic day (ED) 13 to ED21...
January 17, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28096433/sex-differences-in-the-development-of-prolactinoma-in-mice-overexpressing-hcg%C3%AE-role-of-tgf%C3%AE-1
#4
Erika Yanil Faraoni, María Andrea Camilletti, Alejandra Inés Abeledo Machado, Laura Daniela Ratner, Fernanda De Fino, Ilpo T Huhtaniemi, Susana B Rulli, Graciela Diaz-Torga
Female transgenic mice that overexpress the human chorionic gonadotrophin β subunit (hCGβ+) develop prolactinomas, while hCGβ+ males do not. The high levels of circulating hCG induces massive luteinization in the ovary of hCGβ+ females, and progesterone becomes the primary steroid hormone produced, but estradiol remains at physiological level. The involvement of high levels of progesterone in lactotroph proliferation is not clearly understood; hence the pathogenesis of prolactinomas in hCGβ+ females remains unclear...
January 17, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28057869/leptin-stimulates-bone-formation-in-ob-ob-mice-at-doses-having-minimal-impact-on-energy-metabolism
#5
Kenneth A Philbrick, Carmen P Wong, Adam J Branscum, Russell T Turner, Urszula T Iwaniec
Leptin, the protein product of the ob gene, is essential for normal bone growth, maturation, and turnover. Peripheral actions of leptin occur at lower serum levels of the hormone than central actions because entry of leptin into the central nervous system (CNS) is limited due to its saturable transport across the blood brain barrier (BBB). We performed a study in mice to model the impact of leptin production associated with different levels of adiposity on bone formation and compared the response with well-established centrally-mediated actions of the hormone on energy metabolism...
January 5, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28057868/glucocorticoid-receptor-alters-isovolumetric-contraction-and-restrains-cardiac-fibrosis
#6
Rachel Richardson, Emma Batchen, Adrian Thomson, Rowan Darroch, Xinlu Pan, Eva Rog-Zielinska, Wiktoria Wyrzykowska, Kathleen Scullion, Emad A S Al-Dujaili, Mary Diaz, Carmel Moran, Chris J Kenyon, Gillian A Gray, Karen Chapman
Corticosteroids directly affect the heart and vasculature and are implicated in the pathogenesis of heart failure. Attention has focussed upon the role of the mineralocorticoid receptor (MR) in mediating pro-fibrotic and other adverse effects of corticosteroids upon the heart. In contrast, the role of the glucocorticoid receptor (GR) in the heart and vasculature is less well understood. We addressed this in mice with cardiomyocyte and vascular smooth muscle deletion of GR (SMGRKO mice). Survival of SMGRKO mice to weaning was reduced compared with littermate controls...
January 5, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28057867/molecular-diversity-of-corticotropin-releasing-hormone-mrna-containing-neurons-in-the-hypothalamus
#7
Roman A Romanov, Alan Alpar, Tomas Hökfelt, Tibor Harkany
Hormonal responses to acute stress rely on the rapid induction of corticotropin-releasing hormone (CRH) production in the mammalian hypothalamus, with subsequent instructive steps culminating in corticosterone release at the periphery. Hypothalamic CRH neurons in the paraventricular nucleus of the hypothalamus are therefore considered "stress neurons". However, significant morphological and funtional diversity amongst neurons that can transiently produce CRH in other hypothalamic nuclei has been proposed, particularly since histochemical evidence associates CRH to both GABA and glutamate neurotransmission...
January 5, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28053003/melanin-concentrating-hormone-in-peripheral-circulation-in-the-human
#8
Jane Naufahu, Fawaz Alzaid, Marcela Fiuza Brito, Barbora Doslikova, Tania Marcela Valencia, Adam Cunliffe, Joanne F Murray
Melanin concentrating hormone (MCH) is a hypothalamic neuropeptide with a well-characterised role in energy homeostasis and emergent roles in diverse physiologic functions such as arousal, mood and reproduction. Work to date has predominantly focused on its hypothalamic functions using animal models however little attention has been paid to its role in circulation in humans. The aims of this study were to a) develop a radioimmunoassay for the detection of MCH in human plasma; b) establish reference ranges for circulating MCH; and c) characterize the pattern of expression of circulating MCH in humans...
January 4, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28053002/jab1-is-a-t2-dependent-coactivator-or-a-t3-dependent-corepressor-of-trb1-mediated-gene-regulation
#9
Gabriela Hernández-Puga, Arturo Mendoza, Alfonso León-Del-Río, Aurea Orozco
Thyroid hormones (THs) induce pleiotropic effects in vertebrates, mainly through the activation or repression of gene expression. These mechanisms involve thyroid hormone binding to thyroid hormone receptors, an event that is followed by the sequential recruitment of coactivator or corepressor proteins, which in turn modify the rate of transcription. In the present study we looked for specific coregulators recruited by the long isoform of the teleostean thyroid hormone receptor beta 1 (L-Trb1) when bound to the bioactive TH 3,5-T2 (T2)...
January 4, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28053001/cancer-cachexia-differentially-regulates-visceral-adipose-tissue-turnover
#10
Felipe de Oliveira Franco, Magno Alves Lopes, Felipe dos Santos Henriques, Rodrigo X Neves, Cesário Bianchi Filho, Miguel Luiz Batista
Cancer cachexia (CC) is a progressive metabolic syndrome that is marked by severe body weight loss. Metabolic disarrangement of fat tissues is a very early event in CC, followed by adipose tissue (AT) atrophy and remodelling. However, there is little information regarding the possible involvement of cellular turnover in this process. Thus, we evaluated the effect of CC on AT turnover of mesenteric (ME) and retroperitoneal (RP) AT depots as possible factors that contribute to AT atrophy. CC was induced by a subcutaneous injection of Walker tumour cells (2x10(7)) in Wistar rats...
4, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28053000/myoblast-replication-is-reduced-in-the-iugr-fetus-despite-maintained-proliferative-capacity-in-vitro
#11
Susan M Soto, Amy C Blake, Stephanie R Wesolowski, Paul J Rozance, Kristen B Barthel, Bifeng Gao, Byron Hetrick, Carrie McCurdy, Natalia G Garza, William Hay, Leslie A Leinwand, Jacob E Friedman, Laura D Brown
Adults who were affected by intrauterine growth restriction (IUGR) suffer from reductions in muscle mass and insulin resistance, suggesting muscle growth may be restricted by molecular events that occur during fetal development. To explore the basis of restricted fetal muscle growth, we used a sheep model of progressive placental insufficiency-induced IUGR to assess myoblast proliferation within intact skeletal muscle in vivo and isolated myoblasts stimulated with insulin in vitro. Gastrocnemius and soleus muscle weights were reduced by 25% in IUGR fetuses compared to controls (CON)...
January 4, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28052999/a-causal-role-for-hyperinsulinemia-in-obesity
#12
Nicole M Templeman, Søs Skovsø, Melissa M Page, Gareth E Lim, James D Johnson
Insulin modulates the biochemical pathways controlling lipid uptake, lipolysis and lipogenesis at multiple levels. Elevated insulin levels are associated with obesity, and conversely, dietary and pharmacological manipulations that reduce insulin have occasionally been reported to cause weight loss. However, the causal role of insulin hypersecretion in the development of mammalian obesity remained controversial in the absence of direct loss-of-function experiments. Here, we discuss theoretical considerations around the causal role of excess insulin and obesity, as well as recent studies employing mice that are genetically incapable of the rapid and sustained hyperinsulinemia that normally accompanies a high fat diet...
January 4, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/27999091/regulation-of-bone-growth-via-ligand-specific-activation-of-estrogen-receptor-alpha
#13
Maryam Iravani, Marie K Lagerquist, Claes Ohlsson, Lars Savendahl
Estrogens are well known for their capacity to promote bone maturation and at high doses to induce growth plate closure and thereby stop further growth. High-dose estrogen treatment has therefore been used to limit growth in extremely tall girls. However, recent data suggest that this treatment may have severe side effects, including increased risk of cancer and reduced fertility. We hypothesized that estrogenic effects in bone are mediated via ERα signaling. Twelve-week old ovariectomized female C57BL/6 mice were subcutaneously injected for 4 weeks with E2 or selective ERα (PPT) or ERβ (DPN) agonists...
December 20, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27999090/biologically-active-recombinant-carp-lh-as-a-spawning-inducing-agent-for-carp
#14
Joseph Aizen, Lian Hollander-Cohen, Michal Shpilman, Berta Levavi-Sivan
Currently spawning induction in carp species uses carp pituitary extract (CPE) and a combination of synthetic agonist of GnRH -combined with a dopamine antagonist. The main goal of this study was the production of recombinant gonadotropins (GtHs) on a large scale to serve as an alternative to currently used agents. We produced carp (c) recombinant (r) LH as a single-chain in the methylotrophic yeast P. pastoris. LHα-subunit was joined with LHβ-subunit with a flexible linker of three Glycine-Serine repeats and six Histidines to form a mature protein, the β-subunit formed the N-terminal part and the α-subunit the C-terminal part...
December 20, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27999088/interplay-between-the-endocrine-and-circadian-systems-in-fishes
#15
Esther Isorna, Nuria De Pedro, Ana Isabel Valenciano, Ángel Luis Alonso-Gómez, María Jesús Delgado
The circadian system is responsible for the temporal organisation of physiological functions which, in part, involves daily cycles of hormonal activity. In this review, we analyse the interplay between the circadian and endocrine systems in fishes. We first describe the current model of fish circadian system organisation and the basis of the molecular clockwork that enables different tissues to act as internal pacemakers. This system consists of a net of central and peripherally located oscillators, and can be synchronised by the light-dark and feeding-fasting cycles...
December 20, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27999087/selye-s-general-adaptation-syndrome-stress-induced-gastro-duodenal-ulceration-and-ibd
#16
George Fink
Hans Selye in a note to Nature in 1936 initiated the field of stress research by showing that rats exposed to nocuous stimuli responded by way of a "general adaptation syndrome" (GAS). One of the main features of the GAS was the "formation of acute erosions in the digestive tract, particularly in the stomach, small intestine and appendix". This provided experimental evidence for the view based on clinical data that gastro-duodenal (peptic) ulcers could be caused by stress. This hypothesis was challenged by Marshall and Warren's Nobel-prize (2005) winning discovery of a causal association between Helicobacter pylori and peptic ulcers...
December 20, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27980002/the-role-of-nutrient-sensing-in-the-metabolic-changes-after-gastric-bypass-surgery
#17
Sandra Steensels, Matthias Lannoo, Bert Avau, Jorien Laermans, Laurien Vancleef, Ricard Farré, Kristin Verbeke, Inge Depoortere
Taste receptors coupled to the gustatory G-protein, gustducin, on enteroendocrine cells sense nutrients to regulate gut hormone release. During Roux-en-Y gastric bypass (RYGB) surgery, the altered nutrient flow to more distal regions can affect gustducin-mediated gut hormone release, and hence energy and glucose homeostasis. We studied the role of gustducin-mediated signaling in the metabolic improvements and intestinal adaptations along the gut after RYGB surgery in wild-type (WT) and α-gustducin(-/-) (α-gust(-/-)) mice...
December 15, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27980001/exogenous-thyroxine-improves-glucose-intolerance-in-insulin-resistant-rats
#18
Guillermo Vazquez-Anaya, Bridget Martinez, Jose Guadalupe Sonanez-Organis, Daisuke Nakano, A Nishiyama, Rudy M Ortiz
Both hypothyroidism and hyperthyroidism are associated with glucose intolerance, calling into question the contribution of thyroid hormones (TH) on glucose regulation. TH analogues and derivatives may be effective treatment options for glucose intolerance and insulin resistance (IR), but their potential gluco-regulatory effects during conditions of impaired metabolism are not well described. To assess the effects of thyroxine (T4) on glucose intolerance in a model of insulin resistance, an oral glucose tolerance test (oGTT) was performed on three groups of rats (n=8): 1) lean, Long Evans Tokushima Otsuka (LETO), 2) obese, Otsuka Long Evans Tokushima Fatty (OLETF), and 3) OLETF + T4 (8...
December 15, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27927697/absence-of-11-keto-reduction-of-cortisone-and-11-ketotestosterone-in-the-model-organism-zebrafish
#19
Maria Tsachaki, Arne Meyer, Benjamin Weger, Denise V Kratschmar, Janina Tokarz, Jerzy Adamski, Heinz-Georg Belting, Markus Affolter, Thomas Dickmeis, Alex Odermatt
Zebrafish are widely used as model organism. Their suitability for endocrine studies, drug screening and toxicity assessements depends on the extent of conservation of specific genes and biochemical pathways between zebrafish and human. Glucocorticoids consist of inactive 11-keto (cortisone, 11-dehydrocorticosterone) and active 11β-hydroxyl forms (cortisol, corticosterone). In mammals, two 11β-hydroxysteroid dehydrogenases (11β-HSD1, 11β-HSD2) interconvert active and inactive glucocorticoids, allowing tissue-specific regulation of glucocorticoid action...
December 7, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27927696/gene-expression-signature-a-powerful-approach-for-drug-discovery-in-diabetes
#20
Smithamol Sithara, Tamsyn Crowley, Ken Walder, Kathryn Aston-Mourney
Type 2 diabetes (T2D) is increasing in prevalence at an alarming rate around the world. Much effort has gone into the discovery and design of anti-diabetic drugs, however those already available are unable to combat the underlying causes of the disease and instead only moderate the symptoms. The reason for this is that T2D is a complex disease and attempts to target one biological pathway are insufficient to combat the full extent of the disease. Additionally, the underlying pathophysiology of this disease is yet to be fully elucidated making it difficult to design drugs that target the mechanisms involved...
December 7, 2016: Journal of Endocrinology
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