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Ghrelin

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https://www.readbyqxmd.com/read/29143554/the-octanoylated-energy-regulating-hormone-ghrelin-an-expanded-view-of-ghrelin-s-biological-interactions-and-avenues-for-controlling-ghrelin-signaling
#1
Elizabeth R Cleverdon, Kayleigh R McGovern-Gooch, James L Hougland
Ghrelin is a small peptide hormone that requires a unique post-translational modification, serine octanoylation, to bind and activate the GHS-R1a receptor. Initially demonstrated to stimulate hunger and appetite, ghrelin-dependent signaling is implicated in a variety of neurological and physiological processes influencing diseases such as diabetes, obesity, and Prader-Willi syndrome. In addition to its cognate receptor, recent studies have revealed ghrelin interacts with a range of binding partners within the bloodstream...
November 16, 2017: Molecular Membrane Biology
https://www.readbyqxmd.com/read/29138359/comparative-effects-of-intraduodenal-amino-acid-infusions-on-food-intake-and-gut-hormone-release-in-healthy-males
#2
Robert E Steinert, Sina S Ullrich, Nori Geary, Lori Asarian, Marco Bueter, Michael Horowitz, Christine Feinle-Bisset
In contrast to the many studies of the effects of individual amino acids (AAs) on eating, no studies have compared the effects of different AAs on eating and underlying preabsorptive gastrointestinal mechanisms. To compare the effects of intraduodenal infusions of l-tryptophan (TRP), l-leucine (LEU), l-phenylalanine (PHE) and l-glutamine (GLN) on appetite, gastrointestinal hormone responses (including ghrelin, cholecystokinin (CCK), peptide YY (PYY) and glucagon-like peptide-1 [GLP-1]), glycemia (glucagon, insulin and glucose) and test meal size in healthy males, we retrospectively analyzed data from four published independent, randomized, double-blind, placebo-controlled studies of 90-min intraduodenal infusions of the individual AAs...
November 2017: Physiological Reports
https://www.readbyqxmd.com/read/29137815/local-injection-of-d-lys-3-ghrp-6-in-the-rat-amygdala-dentate-gyrus-or-ventral-tegmental-area-impairs-memory-consolidation
#3
Siamak Beheshti, Neda Aslani
It is well known that the hormone ghrelin affects learning and memory in different experimental models of learning. Though, the effect of antagonism of ghrelin receptor type 1a (GHS-R1a) in various regions of the brain and on different stages of learning has not been examined. In this study the effect of injection of a GHS-R1a selective antagonist (d-Lys-3-GHRP-6) into the basolateral amygdala, dentate gyrus or ventral tegmental area was examined on memory consolidation in the passive avoidance task. Adult male Wistar rats weighing 230-280g were used...
November 4, 2017: Neuropeptides
https://www.readbyqxmd.com/read/29137471/serum-levels-of-spexin-and-kisspeptin-negatively-correlate-with-obesity-and-insulin-resistance-in-women
#4
P A Kołodziejskii, E Pruszyńska-Oszmałek, E Korek, M Sassek, D Szczepankiewicz, P Kaczmarek, L Nogowski, P Maćkowiak, K W Nowak, H Krauss, M Z Strowski
Spexin (SPX) and kisspeptin (KISS) are novel peptides relevant in the context of regulation of metabolism, food intake, puberty and reproduction. Here, we studied changes of serum SPX and KISS levels in female non-obese volunteers (BMI<25 kg/m2) and obese patients (BMI>35 kg/m2). Correlations between SPX or KISS with BMI, McAuley index, QUICKI, HOMA IR, serum levels of insulin, glucagon, leptin, adiponectin, orexin-A, obestatin, ghrelin and GLP-1 were assessed. Obese patients had lower SPX and KISS levels as compared to non-obese volunteers (SPX: 4...
November 10, 2017: Physiological Research
https://www.readbyqxmd.com/read/29136100/ghrelin-is-related-to-personality-differences-in-reward-sensitivity-and-impulsivity
#5
Elizabeth Ralevski, Marya Shanabrough, Jenelle Newcomb, Erin Gandelman, Ryan Hayden, Tamas L Horvath, Ismene Petrakis
Aims: Ghrelin, a feeding-related peptide mainly produced in the stomach, has been linked to reward mechanisms for food and drugs of abuse in addition to traits of impulsivity. This study is a secondary analysis of an existing data set designed to examine the direct relationships between fasting ghrelin levels and reward sensitivity/impulsivity in healthy social drinkers. Methods: Participants (n = 20) were recruited from an original study examining the subjective effects of alcohol among social drinkers...
November 9, 2017: Alcohol and Alcoholism: International Journal of the Medical Council on Alcoholism
https://www.readbyqxmd.com/read/29134359/anxiety-depression-and-the-microbiome-a-role-for-gut-peptides
#6
REVIEW
Gilliard Lach, Harriet Schellekens, Timothy G Dinan, John F Cryan
The complex bidirectional communication between the gut and the brain is finely orchestrated by different systems, including the endocrine, immune, autonomic, and enteric nervous systems. Moreover, increasing evidence supports the role of the microbiome and microbiota-derived molecules in regulating such interactions; however, the mechanisms underpinning such effects are only beginning to be resolved. Microbiota-gut peptide interactions are poised to be of great significance in the regulation of gut-brain signaling...
November 13, 2017: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/29133954/exogenous-ghrelin-administration-increases-alcohol-self-administration-and-modulates-brain-functional-activity-in-heavy-drinking-alcohol-dependent-individuals
#7
M Farokhnia, E N Grodin, M R Lee, E N Oot, A N Blackburn, B L Stangl, M L Schwandt, L A Farinelli, R Momenan, V A Ramchandani, L Leggio
Preclinical evidence suggests that ghrelin, a peptide synthesized by endocrine cells of the stomach and a key component of the gut-brain axis, is involved in alcohol seeking as it modulates both central reward and stress pathways. However, whether and how ghrelin administration may impact alcohol intake in humans is not clear. For, we believe, the first time, this was investigated in the present randomized, crossover, double-blind, placebo-controlled, human laboratory study. Participants were non-treatment-seeking alcohol-dependent heavy-drinking individuals...
November 14, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/29132244/adipocytokines-and-ghrelin-level-of-bipolar-patients-from-manic-episode-to-euthymic-episode
#8
Özgür Korhan Tunçel, Gökhan Sarısoy, Birşen Bilgici, Ozan Pazvantoğlu, Eda Çetin, Ebru Kaynar Tunçel
PURPOSE: Obesity and metabolic syndrome (MeS) are more frequently observed in bipolar patients than the general population. This may result from the differences of adipocytokines and ghrelin levels in bipolar disorder. MATERIAL AND METHODS: We evaluated the leptin, adiponectin, resistin and ghrelin levels in bipolar patients (n = 30) in manic episode and in a control group (n = 30). After treatment, the same patients were evaluated again during the euthymic episode...
November 13, 2017: Nordic Journal of Psychiatry
https://www.readbyqxmd.com/read/29129986/ghrelin-protects-human-lens-epithelial-cells-against-oxidative-stress-induced-damage
#9
Jie Bai, Fan Yang, Li Dong, Yi Zheng
Oxidative stress has been recognized as an important mediator in the pathogenesis of age-related cataracts; using antioxidant supplements is one plausible strategy to protect the antioxidative defense system against oxidative stress. Ghrelin administration is expected to reduce ROS, preventing the onset of different diseases. The role of ghrelin, if any, in protecting against oxidative stress in HLECs has never been examined. In the present study, we investigated the effects of ghrelin against H2O2-induced oxidative stress and the associated molecular mechanisms in HLECs and rat lenses...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29129232/effect-of-green-tea-on-plasma-leptin-and-ghrelin-levels-a%C3%A2-systematic-review-and-meta-analysis-of-randomized-controlled-clinical-trials
#10
Fahimeh Haghighatdoost, B Fatemeh Nobakht M Gh, Mitra Hariri
OBJECTIVE: The purpose of this study was to conduct a meta-analysis of randomized controlled trials (RCTs) to assess the effect of green tea on serum leptin and ghrelin concentrations. METHODS: We searched PubMed, ISI Web of Science, Scopus, and Google scholar databases up to December 2016. The searches included RCTs conducted in human adults, and studies on the effect of green tea and green tea extract on serum leptin and ghrelin concentrations as outcome variables...
January 2018: Nutrition
https://www.readbyqxmd.com/read/29128523/acute-effect-of-smoking-and-smoking-abstinence-on-energy-intake-and-appetite-related-hormones-blood-concentrations
#11
M Yannakoulia, C A Anastasiou, K Zachari, M Sidiropoulou, P Katsaounou, R Tenta
The effect of smoking on energy balance and the underlying mechanisms are not fully understood. The aim of the present study is to examine the acute effect of smoking and its abstinence on energy intake, subjective feelings of appetite and related hormones. Fourteen healthy smokers participated in a randomized, crossover study consisting of two trials: the Cigarette trial (participants smoked two cigarettes of their brand within 15min) and the Sham trial (they were asked to hold the cigarette as smoking, but without lighting it)...
November 8, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/29125864/psychological-stress-in-aged-female-mice-causes-acute-hypophagia-independent-of-central-serotonin-2c-receptor-activation
#12
Chinami Matsumoto, Chihiro Yamada, Chiharu Sadakane, Miwa Nahata, Tomohisa Hattori, Hiroshi Takeda
Sex differences exist in the activation of the hypothalamic-pituitary-adrenal axis following exposure to stress, and the stress response is further affected by aging. This study was conducted to elucidate the mechanism of hypophagia in aged female mice exposed to stress. Immediately after a stress load, aged female mice exhibited acute hypophagia and a rise in plasma corticosterone levels. The administration of a serotonin 2C receptor (5-HT2CR) antagonist suppressed plasma corticosterone but did not affect the reduction in food intake...
2017: PloS One
https://www.readbyqxmd.com/read/29121520/effects-of-growth-hormone-releasing-hormone-gene-targeted-ablation-on-ghrelin-induced-feeding
#13
Lucia Recinella, Sheila Leone, Claudio Ferrante, Annalisa Chiavaroli, Rugia Shohreh, Chiara Di Nisio, Michele Vacca, Giustino Orlando, Roberto Salvatori, Luigi Brunetti
Impairment of growth hormone (GH) signaling has been associated with increased feeding and adiposity. The gastric hormone ghrelin, in addition to its GH-secretagogue effects, stimulates food intake after both central and peripheral administration. In the present study we further investigated the feeding regulatory role of the ghrelin-GH axis in a mouse model of isolated GH deficiency due to targeted ablation of the GH-releasing hormone (GHRH) gene [GHRH knockout (GHRHKO)]. We evaluated the effects of intracerebroventricular ghrelin administration on feeding behavior, related hypothalamic neuropeptides and neurotransmitters, and serum ghrelin levels in mice homozygous for GHRHKO allele (-/-) and heterozygous (+/-) control animals...
November 6, 2017: Growth Hormone & IGF Research
https://www.readbyqxmd.com/read/29120924/potential-mechanisms-underlying-the-effect-of-bariatric-surgery-on-eating-behaviour
#14
Roxanna Zakeri, Rachel L Batterham
PURPOSE OF REVIEW: Reduced energy intake, resulting from favourable changes in eating behaviour, is the predominant driver of weight loss following bariatric surgery. Here we review the most recent studies examining the impact of Roux-en-Y gastric bypass (RYGB) and sleeve gastrectomy, the two most common bariatric procedures, upon eating behaviour and the suggested underlying biological mechanisms. RECENT FINDINGS: Following RYGB or sleeve gastrectomy, most people report subjective changes in appetite, taste and food preference, with decreased high-fat preference most commonly reported...
November 7, 2017: Current Opinion in Endocrinology, Diabetes, and Obesity
https://www.readbyqxmd.com/read/29119689/decreased-5-ht2cr-and-ghsr1a-interaction-in-antipsychotic-drug-induced-obesity
#15
REVIEW
X-F Huang, K Weston-Green, Y Yu
Second generation antipsychotics (SGAs), notably atypical antipsychotics including olanzapine, clozapine and risperidone, can cause weight gain and obesity side effects. Antagonism of serotonin 2c receptors (5-HT2cR) and activation of ghrelin receptor type 1a (GHSR1a) signalling have been identified as a main cause of SGA induced obesity. Here we review the pivotal regulatory role of the 5-HT2cR in ghrelin-mediated appetite signalling. The 5-HT2cR dimerizes with GHSR1a to inhibit orexigenic signalling, while 5-HT2cR antagonism reduces dimerization and increases GHSR1a-induced food intake...
November 9, 2017: Obesity Reviews: An Official Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/29113826/ghrelin-suppresses-cardiac-fibrosis-of-post-myocardial-infarction-heart-failure-rats-by-adjusting-the-activin-a-follistatin-imbalance
#16
Chunyan Yang, Jinsha Liu, Kai Liu, Beibei Du, Kaiyao Shi, Mei Ding, Bing Li, Ping Yang
Ghrelin, a growth hormone-releasing peptide, potentially improves cardiac function, but the mechanisms remain unclear. In the study, the rat heart failure (HF) model was established by ligating the left anterior descending coronary artery (LAD) and treated with ghrelin (100μg/kg, subcutaneous injection, bid); neonatal rat cardiomyocytes were cultured and stimulated with Ang II (0.1μM) and ghrelin(0.1μM) to explore the underlying mechanism of ghrelin in myocardial remodeling. Hemodynamic changes and serum brain natriuretic peptide (BNP) concentrations were measured to assess cardiac function...
November 4, 2017: Peptides
https://www.readbyqxmd.com/read/29112739/organophosphate-flame-retardants-alter-adult-mouse-homeostasis-and-gene-expression-in-a-sex-dependent-manner-potentially-through-interactions-with-er%C3%AE
#17
Elizabeth A Krumm, Vipa J Patel, Taylor S Tillery, Ali Yasrebi, Jianliang Shen, Grace L Guo, Stephanie M Marco, Brian T Buckley, Troy A Roepke
Flame retardants (FR) such as polybrominated diphenyl ethers (PBDE) and organophosphate FR (OPFR) persist in the environment and interact with multiple nuclear receptors involved in homeostasis, including estrogen receptors (ER). However, little is known about the effects of FR, especially OPFR, on mammalian neuroendocrine functions. Therefore, we investigated if exposure to FR alters hypothalamic gene expression and whole-animal physiology in adult wild-type (WT) and ERα KO mice. Intact WT and KO males and ovariectomized WT and KO females were orally dosed daily with vehicle (oil), 17α-ethynylestradiol (2...
November 3, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/29107582/perinatal-exposure-to-endocrine-disrupting-compounds-and-the-control-of-feeding-behavior-an-overview
#18
REVIEW
Sabrina N Walley, Troy A Roepke
Endocrine disrupting compounds (EDCs) are ubiquitous environmental contaminants that can interact with steroid and nuclear receptors or alter hormone production. Many studies have reported that perinatal exposure to EDC including bisphenol A, PCB, dioxins, and DDT disrupt energy balance, body weight, adiposity, or glucose homeostasis in rodent offspring. However, little information exists on the effects of perinatal EDC exposure on the control of feeding behaviors and meal pattern (size, frequency, duration), which may contribute to their obesogenic properties...
October 28, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/29105987/a-ketone-ester-drink-lowers-human-ghrelin-and-appetite
#19
Brianna J Stubbs, Pete J Cox, Rhys D Evans, Malgorzata Cyranka, Kieran Clarke, Heidi de Wet
OBJECTIVE: The ketones d-β-hydroxybutyrate (BHB) and acetoacetate are elevated during prolonged fasting or during a "ketogenic" diet. Although weight loss on a ketogenic diet may be associated with decreased appetite and altered gut hormone levels, it is unknown whether such changes are caused by elevated blood ketones. This study investigated the effects of an exogenous ketone ester (KE) on appetite. METHODS: Following an overnight fast, subjects with normal weight (n = 15) consumed 1...
November 6, 2017: Obesity
https://www.readbyqxmd.com/read/29104675/fasting-ghrelin-levels-are-decreased-in-obese-subjects-and-are-significantly-related-with-insulin-resistance-and-body-mass-index
#20
Dimitrios Papandreou, Christos Karavolias, Fotini Arvaniti, Eleana Kafeza, Fatima Sidawi
BACKGROUND: Ghrelin is a 28-amino acid peptide that predominantly produced by the stomach. Strong evidence indicates the effects of ghrelin in the regulation of metabolic functions and its potential role in the aetiology of obesity. AIM: The aim of this study was to investigate the relationship of ghrelin levels with obesity, insulin resistance and glucose in normal and obese subjects. METHODS: Thirteen normal (n = 13) and seven (n = 7) obese weight subjects aged 20-22 participated in the study...
October 15, 2017: Open Access Macedonian Journal of Medical Sciences
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