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Gut hormones

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https://www.readbyqxmd.com/read/28934819/the-role-of-gut-hormones-in-diet-induced-weight-change-a-systematic-review
#1
Xue Zhao, Qing Han, Xiaokun Gang, You Lv, Yujia Liu, Chenglin Sun, Guixia Wang
Gut hormones are known to play an important role in long-term weight loss maintenance after bariatric surgery. However, the interplay between gut hormones and diet-induced weight changes remains unclear. Our aims were to evaluate the alterations of gut hormones in diet-induced weight loss, weight maintenance, and weight regain periods. Available studies were searched on MEDLINE, EMASE, ClinicalTrials.gov, the Cochrane Library, and Web of science from inception to October 2016. After selection, 16 studies with 656 participants were included...
September 21, 2017: Hormone and Metabolic Research, Hormon- und Stoffwechselforschung, Hormones et Métabolisme
https://www.readbyqxmd.com/read/28933067/central-modulation-of-energy-homeostasis-and-cognitive-performance-after-bariatric-surgery
#2
Hans Eickhoff
In moderately or morbidly obese patients, bariatric surgery has been proven to be an effective therapeutic approach to control body weight and comorbidities. Surgery-mediated modulation of brain function via modified postoperative secretion of gut peptides and vagal nerve stimulation was identified as an underlying mechanism in weight loss and improvement of weight-related diseases. Increased basal and postprandial plasma levels of gastrointestinal hormones like glucagon-like peptide 1 and peptide YY that act on specific areas of the hypothalamus to reduce food intake, either directly or mediated by the vagus nerve, are observed after surgery while suppression of meal-induced ghrelin release is increased...
2017: Advances in Neurobiology
https://www.readbyqxmd.com/read/28933061/neuroendocrinology-of-adipose-tissue-and-gut-brain-axis
#3
Paulo Matafome, Hans Eickhoff, Liliana Letra, Raquel Seiça
Food intake and energy expenditure are closely regulated by several mechanisms which involve peripheral organs and nervous system, in order to maintain energy homeostasis.Short-term and long-term signals express the size and composition of ingested nutrients and the amount of body fat, respectively. Ingested nutrients trigger mechanical forces and gastrointestinal peptide secretion which provide signals to the brain through neuronal and endocrine pathways. Pancreatic hormones also play a role in energy balance exerting a short-acting control regulating the start, end, and composition of a meal...
2017: Advances in Neurobiology
https://www.readbyqxmd.com/read/28931720/ph-control-in-the-midgut-of-aedesaegypti-under-different-nutritional-conditions
#4
Denise Barguil Nepomuceno, Vânia Cristina Santos, Ricardo Nascimento Araújo, Marcos Horácio Pereira, Maurício Roberto Sant'Anna, Luciano Andrade Moreira, Nelder Figueiredo Gontijo
Aedes aegypti is one of the most important disease vectors in the world. Because their gut is the first site of interaction with pathogens, it is important to understand A. aegypti gut physiology. In this study, we investigated the mechanisms of pH control in the midgut of A. aegypti females under different nutritional conditions. We found that unfed females have an acidic midgut (pH ∼6). The midgut of unfed insects is actively maintained at pH 6 regardless of the ingestion of either alkaline or acidic buffered solutions...
September 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28931076/ghrelin-mediated-inhibition-of-the-tsh-stimulated-function-of-differentiated-human-thyrocytes-ex-vivo
#5
Maria Barington, Marianne Møller Brorson, Jacob Hofman-Bang, Åse Krogh Rasmussen, Birgitte Holst, Ulla Feldt-Rasmussen
Ghrelin is a peptide hormone produced mainly in the gastrointestinal tract known to regulate several physiological functions including gut motility, adipose tissue accumulation and hunger sensation leading to increased bodyweight. Studies have found a correlation between the plasma levels of thyroid hormones and ghrelin, but an effect of ghrelin on the human thyroid has never been investigated even though ghrelin receptors are present in the thyroid. The present study shows a ghrelin-induced decrease in the thyroid-stimulating hormone (TSH)-induced production of thyroglobulin and mRNA expression of thyroperoxidase in a primary culture of human thyroid cells obtained from paranodular tissue...
2017: PloS One
https://www.readbyqxmd.com/read/28930716/antinociceptive-effect-of-ghrelin-in-a-rat-model-of-irritable-bowel-syndrome-involves-trpv1-opioid-systems
#6
Yuqing Mao, Zhengyang Li, Kan Chen, Huafang Yu, Shaoren Zhang, Miao Jiang, Yuanhua Ma, Chunli Liang, Hongyan Liu, Huanqing Li, Qian Hua, Hao Zhou, Yonghong Sun, Xiaoming Fan
BACKGROUND/AIMS: Irritable bowel syndrome (IBS), defined as recurrent abdominal pain and changes in bowel habits, seriously affects quality of life and ability to work. Ghrelin is a brain-gut hormone, which has been reported to show antinociceptive effects in peripheral pain. We investigated the effect of ghrelin on visceral hypersensitivity and pain in a rat model of IBS. METHODS: Maternal deprivation (MD) was used to provide a stress-induced model of IBS in Wistar rats...
September 20, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28929278/effect-and-mechanisms-of-diabetes-resolution-according-to-the-range-of-gastric-resection-and-the-length-of-anastomosis-in-animal-models-implication-for-gastric-cancer-surgery-in-patients-with-diabetes-mellitus
#7
Yeon-Ju Huh, Young-Gil Son, Tae-Han Kim, Ji-Ho Park, Tae-Jung Oh, Boram Choi, Jimin Min, Young Min Cho, Han-Kwang Yang, Hyuk-Joon Lee
BACKGROUND: To examine the effect and mechanism of Roux-en-Y gastric bypass (RYGB) on the improvement of diabetes according to the length of anastomosis and the gastric pouch volume in an animal model. METHODS: Glucose intolerance was induced with a high-fat diet for 3 months in Sprague-Dawley rats. The animals were subjected to conventional RYGB (cRYGB; 5% gastric pouch with 15-cm Roux limb, 40-cm biliopancreatic limb; n = 9), short-limb RYGB (sRYGB; 5%, 8, 4 cm; n = 9), fundus-sparing RYGB (fRYGB; 30%, 8, 4 cm; n = 9), or sham operation (n = 9)...
September 19, 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/28925886/the-microbiota-gut-brain-axis-in-neuropsychiatric-disorders-pathophysiological-mechanisms-and-novel-treatments
#8
Yong-Ku Kim, Cheolmin Shin
BACKGROUND: The human gut microbiome comprise a huge number of microorganisms with co-evolutionary associations with humans. It has been repeatedly revealed that bidirectional communication exists between the brain and the gut and involves neural, hormonal, and immunological pathways. Evidences from neuroscience researches over the past few years suggest that microbiota is essential for the development and maturation of brain systems that are associated to stress responses. METHOD: This review provides that the summarization of the communication among microbiota, gut and brain and the results of preclinical and clinical studies on gut microbiota used in treatments for neuropsychiatric disorders...
September 15, 2017: Current Neuropharmacology
https://www.readbyqxmd.com/read/28919062/progress-and-challenges-in-anti-obesity-pharmacotherapy
#9
REVIEW
Daniel H Bessesen, Luc F Van Gaal
Obesity is a serious and growing worldwide health challenge. Healthy lifestyle choices are the foundation of obesity treatment. However, weight loss can lead to physiological adaptations that promote weight regain. As a result, lifestyle treatment alone typically produces only modest weight loss that is difficult to sustain. In other metabolic diseases, pharmacotherapy is an accepted adjunct to lifestyle. Several anti-obesity drugs have been approved in the USA, European Union, Australia, and Japan including sympathomimetics, pancreatic lipase inhibitors, GABAA receptor activators, a serotonin 2C receptor agonist, opioid antagonist, dopamine-norepinephrine reuptake inhibitor, and glucagon-like peptide-1 (GLP-1) receptor agonists...
September 14, 2017: Lancet Diabetes & Endocrinology
https://www.readbyqxmd.com/read/28916802/local-juvenile-hormone-activity-regulates-gut-homeostasis-and-tumor-growth-in-adult-drosophila
#10
M M Rahman, X Franch-Marro, J L Maestro, D Martin, A Casali
Hormones play essential roles during development and maintaining homeostasis in adult organisms, regulating a plethora of biological processes. Generally, hormones are secreted by glands and perform a systemic action. Here we show that Juvenile Hormones (JHs), insect sesquiterpenoids synthesized by the corpora allata, are also synthesized by the adult Drosophila gut. This local, gut specific JH activity, is synthesized by and acts on the intestinal stem cell and enteroblast populations, regulating their survival and cellular growth through the JH receptors Gce/Met and the coactivator Tai...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28915217/estradiol-modulates-local-gut-injury-induced-by-intestinal-ischemia-reperfusion-in-male-rats
#11
Fernanda Yamamoto Ricardo-da-Silva, Evelyn Thaís Fantozzi, Sara Rodrigues-Garbin, Ricardo Martins Oliveira-Filho, Bernardo Boris Vargaftig, Ana Cristina Breithaupt-Faloppa, Wothan Tavares de Lima
Intestinal ischemia and reperfusion (I/R) triggers a systemic inflammatory response characterized by leukocyte mobilization from the bone marrow, release of cytokines to the circulation, and increased microvascular permeability, leading to high mortality. Females have shown attenuated inflammatory response to trauma when compared with males, indicating a role for female sex hormones in this process. Here, we have evaluated the effect of estradiol on the local gut injury induced by I/R in male rats. I/R was induced by the clamping of the superior mesenteric artery for 45 min, followed by 2 h of reperfusion...
October 2017: Shock
https://www.readbyqxmd.com/read/28912908/gastrin-releasing-peptide-and-glucose-metabolism-following-pancreatitis
#12
Sayali A Pendharkar, Marie Drury, Monika Walia, Murray Korc, Maxim S Petrov
BACKGROUND: Gastrin-releasing peptide (GRP) is a pluripotent peptide that has been implicated in both gastrointestinal inflammatory states and classical chronic metabolic diseases such as diabetes. Abnormal glucose metabolism (AGM) after pancreatitis, an exemplar inflammatory disease involving the gastrointestinal tract, is associated with persistent low-grade inflammation and altered secretion of pancreatic and gut hormones as well as cytokines. While GRP is involved in secretion of many of them, it is not known whether GRP has a role in AGM...
August 2017: Gastroenterology Research
https://www.readbyqxmd.com/read/28910546/could-hop-derived-bitter-compounds-improve-glucose-homeostasis-by-stimulating-the-secretion-of-glp-1
#13
Luigi Barrea, Giuseppe Annunziata, Giovanna Muscogiuri, Angela Arnone, Gian Carlo Tenore, Annamaria Colao, Silvia Savastano
Hops (Humulus lupulus L.) is by far the greatest contributors to the bitter property of beer. Over the past years, a large body of evidence demonstrated the presence of taste receptors in different locations of the oral cavity. In addition to the taste buds of the tongue, cells expressing these receptors have been identified in olfactory bulbs, respiratory and gastrointestinal tract. In the gut, the attention was mainly directed to sweet Taste Receptor (T1R) and bitter Taste Receptor (T2R) receptors. In particular, T2R has shown to modulate secretion of different gut hormones, mainly Glucagon-like Peptide 1 (GLP-1), which are involved in the regulation of glucose homeostasis and the control of gut motility, thereby increasing the sense of satiety...
September 14, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28898875/enteroendocrine-cells-metabolic-relays-between-microbes-and-their-host
#14
Hubert Plovier, Patrice D Cani
Gut bacteria exert a variety of metabolic functions unavailable to the host and are increasingly seen as a virtual organ located inside our gastrointestinal tract. Scattered in our intestinal epithelium, enteroendocrine cells (EECs) regulate several aspects of the host's physiology and translate signals coming from the gut microbiota through their hormonal secretions. In this chapter, we will assess the interplay between the gut microbiota and EEC and its consequences for the physiology of the host. We will first describe alterations of different populations of EEC in germ-free animals...
2017: Endocrine Development
https://www.readbyqxmd.com/read/28898656/seed-dormancy-and-germination
#15
Steven Penfield
Reproduction is a critical time in plant life history. Therefore, genes affecting seed dormancy and germination are among those under strongest selection in natural plant populations. Germination terminates seed dispersal and thus influences the location and timing of plant growth. After seed shedding, germination can be prevented by a property known as seed dormancy. In practise, seeds are rarely either dormant or non-dormant, but seeds whose dormancy-inducing pathways are activated to higher levels will germinate in an ever-narrower range of environments...
September 11, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28892258/sitagliptin-and-roux-en-y-gastric-bypass-modulate-insulin-secretion-via-regulation-of-intra-islet-pyy
#16
Claudia Guida, Laura J McCulloch, Mahdieh Godazgar, Sam D Stephen, Charlotte Baker, Davide Basco, Jiawen Dong, Duan Chen, Anne Clark, Reshma D Ramracheya
AIMS: The gut hormone peptide tyrosine tyrosine (PYY) is critical for maintaining islet integrity and restoring islet function following Roux-en-Y gastric bypass (RYGB). The expression of PYY and its receptors (NPYRs) in islets has been documented but not fully characterized. Modulation of islet PYY by the proteolytic enzyme DPP-IV has not been investigated and the impact of DPP-IV inhibition on islet PYY function remains unexplored. Here we have addressed these gaps and their effects on glucose-stimulated insulin secretion (GSIS)...
September 11, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28890700/dietary-capsaicin-improves-glucose-homeostasis-and-alters-the-gut-microbiota-in-obese-diabetic-ob-ob-mice
#17
Jun-Xian Song, Hui Ren, Yuan-Feng Gao, Chong-You Lee, Su-Fang Li, Feng Zhang, Long Li, Hong Chen
Background: The effects of capsaicin on obesity and glucose homeostasis are still controversial and the mechanisms underlying these effects remain largely unknown. This study aimed to investigate the potential relationship between the regulation of obesity and glucose homeostasis by dietary capsaicin and the alterations of gut microbiota in obese diabetic ob/ob mice. Methods: The ob/ob mice were subjected to a normal, low-capsaicin (0.01%), or high-capsaicin (0.02%) diet for 6 weeks, respectively. Obesity phenotypes, glucose homeostasis, the gut microbiota structure and composition, short-chain fatty acids, gastrointestinal hormones, and pro-inflammatory cytokines were measured...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28888753/the-role-of-gut-microbiome-in-the-pathogenesis-of-prostate-cancer-a-prospective-pilot-study
#18
David M Golombos, Abimbola Ayangbesan, Padraic O'Malley, Patrick Lewicki, LaMont Barlow, Christopher E Barbieri, Chrystal Chan, Casey DuLong, Galeb Abu-Ali, Curtis Huttenhower, Douglas S Scherr
OBJECTIVE: To elucidate potential biomarkers or mechanistic principles involved with the gut microbiota and its impact on prostate cancer pathogenesis. MATERIALS AND METHODS: A prospective case-control pilot study evaluating the gut microbiome of 20 men with either benign prostatic conditions (n = 8) or intermediate/high risk clinically localized prostate cancer (Gleason ≥4+3 cN0M0) (n = 12) undergoing care at tertiary referral center from 9/1/2015 - 3/1/2016...
September 6, 2017: Urology
https://www.readbyqxmd.com/read/28888429/taste-receptors-in-the-gut-a-new-target-for-health-promoting-properties-in-diet
#19
REVIEW
Bo Ekstrand, Jette Feveile Young, Martin Krøyer Rasmussen
In this review we describe a new target for food functionality, the taste receptors in the gastrointestinal tract. These receptors are involved in an intricate signalling network for monitoring of taste and nutrient intake, homeostasis and energy metabolism, and they are also an early warning system for toxic substances in our diet. Especially the receptors for bitter taste provide a new possibility to activate a number of health related signalling pathways, already at low concentrations of the active substance, without requiring uptake into the body and transport via the circulation...
October 2017: Food Research International
https://www.readbyqxmd.com/read/28887853/neuroendocrine-mechanisms-underlying-bariatric-surgery-insights-from-human-studies-and-animal-models
#20
REVIEW
Aneta Stefanidis, Brian J Oldfield
Obesity has reached epidemic proportions and to date, bariatric surgery remains the only effective treatment for morbid obesity in terms of its capacity to achieve durable weight loss. Bariatric surgery procedures, including Roux-en-Y gastric bypass (RYGB), adjustable gastric banding (AGB) and sleeve gastrectomy (SG) have been the primary procedures conducted over the past decade, with SG increasing in popularity over the past five years at the expense of both RYGB and AGB. Although these procedures were initially proposed to function via restrictive or malabsorptive mechanisms, it is now clear that profound physiological changes underlie the metabolic improvements in patients who undergo bariatric surgery...
September 8, 2017: Journal of Neuroendocrinology
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