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Ghrelin

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https://www.readbyqxmd.com/read/28340044/oral-ghrelin-receptor-agonist-mk-0677-increases-serum-insulin-like-growth-factor-1-in-hemodialysis-patients-a-randomized-blinded-study
#1
Garland A Campbell, James T Patrie, Bruce D Gaylinn, Michael O Thorner, Warren K Bolton
Background: . Protein-energy wasting (PEW) in end-stage renal disease (ESRD) patients is associated with increased morbidity and mortality, but options for treatment are limited. Growth hormone (GH) increases insulin-like growth factor 1 (IGF-1), with improved nutritional parameters, but must be given subcutaneously and does not provide normal GH secretion patterns. MK-0677, an oral ghrelin receptor agonist (GRA), maintains normal GH secretion and increases lean body mass in normal subjects; it has not been studied in dialysis patients, an essential step in assessing efficacy and safety prior to clinical trials...
March 3, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28339424/comparison-of-weight-loss-ghrelin-and-leptin-hormones-after-ligation-of-left-gastric-artery-and-sleeve-gastrectomy-in-a-rat-model
#2
Erkan Yardimci, Suleyman Bozkurt, Merve Busra Cengiz, Fatma Umit Malya
BACKGROUND Ligation of the left gastric artery (LLGA), which supplies the fundus of the stomach, may reduce the appetite hormone ghrelin, resulting in weight control. The aim of this study was to compare LLGA and sleeve gastrectomy (SG) in terms of postoperative outcomes in a rat model. MATERIAL AND METHODS Fifteen male Wistar albino rats, weighing >350 grams (range 350-525 grams), were enrolled in LLGA (N=5), SG (N=5), and control (N=5) groups. Blood samples were drawn preoperatively and also during the first and fourth week postoperatively to assay ghrelin and leptin hormone levels...
March 24, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28325732/whey-protein-effects-on-energy-balance-link-the-intestinal-mechanisms-of-energy-absorption-with-adiposity-and-hypothalamic-neuropeptide-gene-expression
#3
Kanishka N Nilaweera, Raul Cabrera-Rubio, John R Speakman, Paula M O' Connor, AnneMarie McAuliffe, Caitriona M Guinane, Elaine Lawton, Fiona Crispie, Mònica Aguilera, Maurice Stanley, Serena Boscaini, Susan Joyce, Silvia Melgar, John F Cryan, Paul D Cotter
We tested the hypothesis that dietary whey protein isolate (WPI) affects the intestinal mechanisms related to energy absorption and that the resulting energy deficit is compensated by changes in energy balance to support growth. C57BL/6 mice were provided a diet enriched with WPI with varied sucrose content, and the impact on energy balance related parameters were investigated. As part of a high sucrose diet, WPI reduced the hypothalamic expression of pro-opiomelanocortin gene expression and increased energy intake...
March 21, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28323938/loss-of-action-via-neurotensin-leptin-receptor-neurons-disrupts-leptin-and-ghrelin-mediated-control-of-energy-balance
#4
Juliette A Brown, Raluca Bugescu, Thomas Mayer, Adriana Gata-Garcia, Gizem Kurt, Hillary L Woodworth, Gina M Leinninger
The hormones ghrelin and leptin act via the lateral hypothalamic area (LHA) to modify energy balance but the underlying neural mechanisms remain unclear. We investigated how leptin and ghrelin engage LHA neurons to modify energy balance behaviors and whether there is any cross-talk between leptin and ghrelin-responsive circuits. We demonstrate that ghrelin activates LHA neurons expressing Hypocretin/Orexin (OX) to increase food intake. Leptin mediates anorectic actions via separate neurons expressing the long form of the leptin receptor (LepRb), many of which co-express the neuropeptide neurotensin (Nts); we refer to these as NtsLepRb neurons...
March 10, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323448/effects-of-chronic-ghrelin-treatment-on-hypoxia-induced-brain-oxidative-stress-and-inflammation-in-a-rat-normobaric-chronic-hypoxia-model
#5
Hasan Omrani, Mohammad Reza Alipour, Fereshteh Farajdokht, Hadi Ebrahimi, Mehran Mesgari Abbasi, Gisou Mohaddes
AIM: This study aimed to evaluate the probable antioxidant effects of ghrelin in the brain and serum and its effect on tumor necrosis factor-alpha (TNF-α) levels in the brain in a model of chronic systemic hypoxia in rats. METHODS: Systemic hypoxia was induced by a normobaric hypoxic chamber (O2 11%) for ten days. Adult male Wistar rats were divided into control (C), chronic ghrelin (80 μg/kg/10 days) (Ghr), chronic hypoxia (CH), and CH and ghrelin (80 μg/kg/ip/10 days) (CH + Gh) groups...
March 21, 2017: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/28321024/the-growth-hormone-secretagogue-hexarelin-protects-rat-cardiomyocytes-from-in-vivo-ischemia-reperfusion-injury-through-interleukin-1-signaling-pathway
#6
Jiannan Huang, Yi Li, Juan Zhang, Yusheng Liu, Qinghua Lu
Hexarelin, a synthetic growth hormone-releasing peptide, has been proven to possess cardioprotective actions through its binding to the growth hormone secretagogue receptor (GHSR) 1a and the non-GHSR receptor CD36. However, its effect on myocardial ischemia/reperfusion (I/R) injury has not been fully clarified in vivo. We aimed to determine whether hexarelin treatment could protect cardiomyocytes from I/R injury and to examine the underlying mechanisms. In vivo hearts of male SD rats underwent 30 minutes of ischemia by left coronary artery ligation followed by reperfusion...
March 17, 2017: International Heart Journal
https://www.readbyqxmd.com/read/28315847/effects-of-peripherally-and-centrally-applied-ghrelin-on-the-oxidative-stress-induced-by-renin-angiotensin-system-in-a-rat-model-of-renovascular-hypertension
#7
Vivian Boshra, Amr M Abbas
BACKGROUND: Renovascular hypertension (RVH) is a result of renal artery stenosis, which is commonly due to astherosclerosis. In this study, we aimed to clarify the central and peripheral effects of ghrelin on the renin-angiotensin system (RAS) in a rat model of RVH. METHODS: RVH was induced in rats by partial subdiaphragmatic aortic constriction. Experiment A was designed to assess the central effect of ghrelin via the intracerebroventricular (ICV) injection of ghrelin (5 μg/kg) or losartan (0...
March 20, 2017: Journal of Basic and Clinical Physiology and Pharmacology
https://www.readbyqxmd.com/read/28304146/liraglutide-acutely-suppresses-glucagon-lipolysis-and-ketogenesis-in-type-1-diabetes
#8
Manisha Garg, Husam Ghanim, Nitesh D Kuhadiya, Kelly Green, Jeanne Hejna, Sanaa Abuaysheh, Barrett Torre, Manav Batra, Antoine Makdissi, Ajay Chaudhuri, Paresh Dandona
In view of the occurrence of diabetic ketoacidosis associated with the use of sodium-glucose transport protein-2 (SGLT2) inhibitors in patients with type 1 diabetes (T1DM) and the relative absence of this complication in patients treated with liraglutide in spite of reductions in insulin doses, we investigated the effect of liraglutide on ketogenesis. Twenty-six patients with inadequately controlled T1DM were randomly divided into two groups of 13 patients each. After an overnight fast, patients were injected, subcutaneously, with either liraglutide 1...
March 17, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28300626/changes-in-circulating-peptide-yy-and-ghrelin-are-associated-with-early-smoking-relapse
#9
Andrine M Lemieux, Mustafa al'Absi
Ghrelin and peptide YY (PYY) during ad libitum smoking have been associated with decreased reported craving (ghrelin) and increased positive affect (PYY), and higher baseline ghrelin levels predicted subsequent increased risk of smoking relapse. The current study assessed PYY and ghrelin during ad libitum smoking and again after the initial 48hours of a smoking cessation attempt. The data compared smokers who abstained for 28days (n=37), smokers who relapsed (n=54), and nonsmokers (n=37). Plasma samples and subjective measures assessing craving and mood were collected at the beginning of each session...
March 11, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28298897/plasma-ghrelin-levels-are-associated-with-anorexia-but-not-cachexia-in-patients-with-nsclc
#10
Susanne Blauwhoff-Buskermolen, Jacqueline A E Langius, Annemieke C Heijboer, Annemarie Becker, Marian A E de van der Schueren, Henk M W Verheul
Background and Aims: The ghrelin receptor is one of the new therapeutic targets in the cancer anorexia-cachexia syndrome. Previous studies revealed that plasma ghrelin levels were high in patients with anorexia nervosa and low in obese subjects. We studied to what extent ghrelin levels are related with anorexia and cachexia in patients with cancer. Materials and Methods: Fasted ghrelin levels were determined as well as anorexia and cachexia in patients with stage III/IV non-small cell lung cancer before chemotherapy...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28294994/is-ghrelin-synthesized-in-the-central-nervous-system
#11
REVIEW
Agustina Cabral, Eduardo J López Soto, Jacques Epelbaum, Mario Perelló
Ghrelin is an octanoylated peptide that acts via its specific receptor, the growth hormone secretagogue receptor type 1a (GHSR-1a), and regulates a vast variety of physiological functions. It is well established that ghrelin is predominantly synthesized by a distinct population of endocrine cells located within the gastric oxyntic mucosa. In addition, some studies have reported that ghrelin could also be synthesized in some brain regions, such as the hypothalamus. However, evidences of neuronal production of ghrelin have been inconsistent and, as a consequence, it is still as a matter of debate if ghrelin can be centrally produced...
March 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28294567/growth-hormone-secretagogues-prevent-dysregulation-of-skeletal-muscle-calcium-homeostasis-in-a-rat-model-of-cisplatin-induced-cachexia
#12
Elena Conte, Giulia Maria Camerino, Antonietta Mele, Michela De Bellis, Sabata Pierno, Francesco Rana, Adriano Fonzino, Roberta Caloiero, Laura Rizzi, Elena Bresciani, Khoubaib Ben Haj Salah, Jean-Alain Fehrentz, Jean Martinez, Arcangela Giustino, Maria Addolorata Mariggiò, Mauro Coluccia, Domenico Tricarico, Marcello Diego Lograno, Annamaria De Luca, Antonio Torsello, Diana Conte, Antonella Liantonio
BACKGROUND: Cachexia is a wasting condition associated with cancer types and, at the same time, is a serious and dose-limiting side effect of cancer chemotherapy. Skeletal muscle loss is one of the main characteristics of cachexia that significantly contributes to the functional muscle impairment. Calcium-dependent signaling pathways are believed to play an important role in skeletal muscle decline observed in cachexia, but whether intracellular calcium homeostasis is affected in this situation remains uncertain...
March 10, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28293234/dysbiosis-of-gut-microbiota-associated-with-clinical-parameters-in-polycystic-ovary-syndrome
#13
Rui Liu, Chenhong Zhang, Yu Shi, Feng Zhang, Linxia Li, Xuejiao Wang, Yunxia Ling, Huaqing Fu, Weiping Dong, Jian Shen, Andrew Reeves, Andrew S Greenberg, Liping Zhao, Yongde Peng, Xiaoying Ding
Polycystic ovary syndrome (PCOS) is a common endocrine and metabolic disorder in women. Gut microbiota has been implicated to play a critical role in metabolic diseases and may modulate the secretion of mediators of the brain-gut axis. Interaction between gut microbiota and the endocrine and biochemical disturbances in PCOS still remains elusive. Here, we showed an altered gut microbiota significantly correlated with PCOS phenotype. There were 33 patients with PCOS (non-obese PCOS individuals, PN, n = 12; obese PCOS individuals, PO, n = 21) as well as 15 control subjects (non-obese control individuals, CN, n = 9; obese control individuals, CO, n = 6) enrolled in our study...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28290296/the-acute-impact-of-the-intake-of-four-types-of-bread-on-satiety-and-blood-concentrations-of-glucose-insulin-free-fatty-acids-triglyceride-and-acylated-ghrelin-a-randomized-controlled-cross-over-trial
#14
S Bo, M Seletto, A Choc, V Ponzo, A Lezo, A Demagistris, A Evangelista, G Ciccone, M Bertolino, M Cassader, R Gambino
The purpose of the present study is to compare the effects of four different breads (one commercial par-baked wheat bread, three sourdough breads prepared with commercial wheat flour, organic wheat flour, organic einkorn flour) in 16 healthy subjects. The primary outcome of this randomized cross-over trial was evaluating intra-individual changes in glycemic areas-under-the-curve (AUCs) after 50g carbohydrate portions of each bread; secondary outcomes were changes in insulin, fatty free acids (FFA), triglyceride, acylated ghrelin and satiety AUCs...
February 2017: Food Research International
https://www.readbyqxmd.com/read/28287413/the-effect-of-short-term-dietary-fructose-supplementation-on-gastric-emptying-rate-and-gastrointestinal-hormone-responses-in-healthy-men
#15
Adora M W Yau, John McLaughlin, Ronald J Maughan, William Gilmore, Gethin H Evans
This study aimed to examine gastric emptying rate and gastrointestinal hormone responses to fructose and glucose ingestion following 3 days of dietary fructose supplementation. Using the (13)C-breath test method, gastric emptying rates of equicaloric fructose and glucose solutions were measured in 10 healthy men with prior fructose supplementation (fructose supplement, FS; glucose supplement, GS) and without prior fructose supplementation (fructose control, FC; glucose control, GC). In addition, circulating concentrations of acylated ghrelin (GHR), glucagon-like peptide-1 (GLP-1), glucose-dependent insulinotropic polypeptide (GIP), and insulin were determined, as well as leptin, lactate, and triglycerides...
March 10, 2017: Nutrients
https://www.readbyqxmd.com/read/28282857/neurogenic-effects-of-ghrelin-on-the-hippocampus
#16
REVIEW
Chanyang Kim, Sehee Kim, Seungjoon Park
Mammalian neurogenesis continues throughout adulthood in the subventricular zone of the lateral ventricle and in the subgranular zone of the dentate gyrus in the hippocampus. It is well known that hippocampal neurogenesis is essential in mediating hippocampus-dependent learning and memory. Ghrelin, a peptide hormone mainly synthesized in the stomach, has been shown to play a major role in the regulation of energy metabolism. A plethora of evidence indicates that ghrelin can also exert important effects on neurogenesis in the hippocampus of the adult brain...
March 8, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28282447/neonatal-overfeeding-disrupts-pituitary-ghrelin-signalling-in-female-rats-long-term-implications-for-the-stress-response
#17
Luba Sominsky, Ilvana Ziko, Sarah J Spencer
The hypothalamic-pituitary-adrenal (HPA) axis responses to psychological stress are exacerbated in adult female but not male rats made obese due to overfeeding in early life. Ghrelin, traditionally known for its role in energy homeostasis, has been recently recognised for its role in coordinating the HPA responses to stress, particularly by acting directly at the anterior pituitary where the growth hormone secretagogue receptor (GHSR), the receptor for acyl ghrelin, is abundantly expressed. We therefore hypothesised that neonatal overfeeding in female rats would compromise pituitary responsiveness to ghrelin, contributing to a hyperactive central stress responsiveness...
2017: PloS One
https://www.readbyqxmd.com/read/28281036/ghrelin-protected-neonatal-rat-cardiomyocyte-against-hypoxia-reoxygenation-injury-by-inhibiting-apoptosis-through-akt-mtor-signal
#18
Lifeng Wang, Yingjie Lu, Xian Liu, Xiaoyun Wang
Reducing reperfusion period myocardial cell damage is efficient to reduce myocardial ischemia-reperfusion injury. Ghrelin can increase myocardial contractility, improve heart failure caused by myocardial infarction. This study aimed to investigate the protective effect of Ghrelin on myocardial hypoxia/reoxygenation (H/R) injury of neonatal rat cardiomyocytes (NRCMs) and to explore the mechanisms. We isolated the NRCMs, established myocardial H/R model, blocked growth hormone secretagogue receptor (GHSR) by siRNA technique, examined cell activity by MTT and LDH assay, detected apoptosis by Hoechst 33258 staining and flow cytometry and determined the expression levels of apoptosis related proteins and signaling pathway proteins by western blot...
March 9, 2017: Molecular Biology Reports
https://www.readbyqxmd.com/read/28277117/structural-imaging-of-the-brain-reveals-decreased-total-brain-and-total-gray-matter-volumes-in-obese-but-not-in-lean-women-with-polycystic-ovary-syndrome-compared-to-body-mass-index-matched-counterparts
#19
Basak Ozgen Saydam, Arzu Ceylan Has, Gurkan Bozdag, Kader Karli Oguz, Bulent Okan Yildiz
PURPOSE: To detect differences in global brain volumes and identify relations between brain volume and appetite-related hormones in women with polycystic ovary syndrome (PCOS) compared to body mass index-matched controls. METHODS: Forty subjects participated in this study. Cranial magnetic resonance imaging and measurements of fasting ghrelin, leptin and glucagon-like peptide 1 (GLP-1), as well as GLP-1 levels during mixed-meal tolerance test (MTT), were performed...
March 1, 2017: Gynecological Endocrinology
https://www.readbyqxmd.com/read/28276817/bariatric-embolization-a-new-and-effective-option-for-the-obese-patient
#20
Clifford R Weiss, Anjaneya S Kathait
Obesity is a public health epidemic in the United States, which results in significant morbidity, mortality, and cost to the healthcare system. Despite advancements in traditional therapeutic options for the obese patients, there is a treatment gap for patients in whom lifestyle modifications alone have not been successful, but for whom bariatric surgery is not a suitable option. Areas covered: This treatment gap needs to be addressed and thus, complimentary or alternative treatments to lifestyle changes and surgery are urgently needed...
April 2017: Expert Review of Gastroenterology & Hepatology
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