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https://www.readbyqxmd.com/read/29791774/serotonergic-regulation-of-insulin-secretion
#1
REVIEW
Luis Rodrigo Cataldo Bascuñan, Claire Lyons, Hedvig Bennet, Isabella Artner, Malin Fex
The exact physiological role for the monoamine serotonin (5-HT) in modulation of insulin secretion is yet to be fully understood. Although the presence of this monoamine in islets of Langerhans is well established, it is only with recent advances that the complex signaling network in islets involving 5-HT is being unraveled. With more than fourteen different 5-HT receptors expressed in human islets, and receptor independent mechanisms in insulin producing β-cells, our understanding of 5-HT's regulation of insulin secretion is increasing...
May 23, 2018: Acta Physiologica
https://www.readbyqxmd.com/read/29790260/endogenous-glp-1-alters-postprandial-functional-connectivity-between-homeostatic-and-reward-related-brain-regions-involved-in-the-regulation-of-appetite-in-healthy-lean-males-a-pilot-study
#2
Anne Christin Meyer-Gerspach, Huynh Giao Ly, Stefan Borgwardt, Patrick Dupont, Christoph Beglinger, Lukas Van Oudenhove, Bettina K Wölnerhanssen
AIMS: Peripheral infusion of glucagon-like peptide-1 (GLP-1) can affect brain activity in areas involved in the regulation of appetite, including hypothalamic and reward-related brain regions. In contrast, the physiological role of endogenous GLP-1 in the central regulation of appetite has hardly been investigated. MATERIALS AND METHODS: The study was performed as randomized, cross-over trial. Twelve healthy volunteers received an intragastric (ig) glucose (gluc) load with or without intravenous (iv) exendin9-39 (ex9-39; specific GLP-1 receptor antagonist)...
May 22, 2018: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/29790129/duodenum-exclusion-alone-is-sufficient-to-improve-glucose-metabolism-in-stz-induced-diabetes-rats
#3
Weihang Wu, Li Lin, Zhixiong Lin, Weijin Yang, Zhicong Cai, Jie Hong, Jiandong Qiu, Chen Lin, Nan Lin, Yu Wang
BACKGROUND: Several studies have found that metabolic surgery can significantly improve glucose homeostasis; however, the intrinsic mechanisms remain unclear. Accumulating evidence suggests that duodenal bypass plays a crucial role in the treatment of type 2 diabetes mellitus (T2DM). Here, we aimed to evaluate the effect of duodenal reflux on glucose metabolism in T2DM. METHODS: A high-fat diet and low-dose streptozotocin (STZ) administration were used to induce T2DM in male rats, which were assigned to three experimental groups: sham operation (SO; n = 10), new duodenal-jejunal bypass (NDJB; n = 10), and new duodenal-jejunal bypass with a tube (NDJBT; n = 10)...
May 22, 2018: Obesity Surgery
https://www.readbyqxmd.com/read/29790028/stimulus-for-glucagon-like-peptide-1-secretion-in-rats
#4
Yu V Natochin, A V Kutina, A S Marina, E I Shakhmatova
Blood concentration of glucagon-like peptide-1 (GLP-1) increased 5 min after per os administration of water, sodium chloride solution, or glucose solution. Changes in blood osmolality or blood glucose level did not stimulate GLP-1 release. A method of short-term increase in the gastric capacity in rats using an inflating balloon attached to the Foley catheter was developed in order to test the hypothesis that excitation of the upper gastrointestinal tract receptors is a primary signal for the GLP-1 secretion during oral intake of the substances...
March 2018: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
https://www.readbyqxmd.com/read/29788009/the-effect-of-feeding-behavior-on-hypothalamus-in-obese-type-2-diabetic-rats-with-glucagon-like-peptide-1-receptor-agonist-intervention
#5
Ke Lu, Xiaoyan Chen, Jianhua Yan, Xinchun Li, Chen Huang, Qi Wan, Xuelian Deng, Qiao Zou
OBJECTIVE: To investigate the utility of intravoxel incoherent motion-diffusion weighted imaging (IVIM-DWI) derived parameters in hypothalamus for monitoring the effect of Exendin-4 (Ex-4) intervention on the feeding behavior in obese diabetic rats within early feeding. METHODS: 21 obese and 19 non-obese rats which were treated with streptozotocin injections were initially divided into an obese diabetes group (OD, n = 10), a non-obese diabetes group (D, n = 8), an obese group (O, n = 9) and a non-obese group (N, n = 9)...
May 23, 2018: Obesity Facts
https://www.readbyqxmd.com/read/29787521/survival-and-metabolic-function-of-syngeneic-mouse-islet-grafts-transplanted-into-the-hepatic-sinus-tract
#6
Feng Li, Ao Jiao, Xiaohang Li, Chengshuo Zhang, Ning Sun, Jialin Zhang
BACKGROUND: Islet grafts are transplanted into the liver via a portal vein in 90% of the clinical islet transplantations. However, the portal vein is far from being the ideal infusion site due to its unique drawbacks. These issues necessitated the exploration of an alternatively optimized site for clinical islet transplantation. With the widespread clinical application of percutaneous transhepatic puncture technique, we envisioned the possibility of islet transplantation into the hepatic sinus-tract (HST)...
May 22, 2018: Transplantation
https://www.readbyqxmd.com/read/29785472/the-impacts-of-gastroileostomy-rat-model-on-glucagon-like-peptide-1-a-promising-model-to-control-type-2-diabetes-mellitus
#7
Behrouz Keleidari, Rastin Mohammadi Mofrad, Shahab Shahabi Shahmiri, Mohammad Hossein Sanei, Mohsen Kolahdouzan, Erfan Sheikhbahaei
BACKGROUND: One of the new current treatment options for Diabetes Mellitus is about increasing glucagon-like peptide-1 (GLP-1) activity. GLP-1 with its incretin effect showed major role in glucose homeostasis. Gastroileostomy can increase GLP-1 secretion by rapid delivery of undigested food to the terminal ileum. We studied the early effects of a gastroileostomy on serum levels of GLP-1, glucose, and insulin in rats. METHODS: Gastroileostomies with side-to-side anastomosis were performed on 15 male New Zealand rats...
May 21, 2018: Obesity Surgery
https://www.readbyqxmd.com/read/29782892/a-glp-1-cck-fusion-peptide-harnesses-the-synergistic-effects-on-metabolism-of-cck-1-and-glp-1-receptor-agonism-in-mice
#8
David C Hornigold, Emma Roth, Victor Howard, Sarah Will, Stephanie Oldham, Matthew P Coghlan, Clemence Blouet, James L Trevaskis
Combination approaches for the treatment of metabolic diseases such as obesity and diabetes are becoming increasingly relevant. Co-administration of a glucagon-like peptide-1 receptor (GLP-1R) agonist with a cholecystokinin receptor-1 (CCKR1) agonist exert synergistic effects on weight loss in obese rodents. Here, we report on the effects of a novel fusion peptide (C2816) comprised of a stabilized GLP-1R agonist, AC3174, and a CCKR1-selective agonist, AC170222. C2816 was constructed such that AC3174 was linked to the N-terminus of AC170222, thus preserving the C-terminal amide of the CCK moiety...
May 18, 2018: Appetite
https://www.readbyqxmd.com/read/29780590/medical-management-of-esophageal-food-impaction-refractory-to-endoscopic-interventions
#9
Lauren Stemboroski, Ronald Brown, Keyrillos Rizg, James S Scolapio, Miguel Malespin, Silvio W de Melo
Most esophageal food impactions either pass spontaneously or are treated endoscopically. Severe food impactions can require extensive endoscopic therapy that potentially could lead to procedure-related complications. There are few alternate therapies available when endoscopy fails. Traditionally, pharmacologic therapy with glucagon has been performed with varying success. This case report and discussion will outline the management of a complete food impaction and medical therapies available when first-line endoscopic treatment fails...
2018: SAGE Open Medical Case Reports
https://www.readbyqxmd.com/read/29780260/efficacy-and-safety-profile-of-once-weekly-dulaglutide-in-type-2-diabetes-a-report-on-the-emerging-new-data
#10
REVIEW
Anne J Kugler, Michael L Thiman
Dulaglutide is a once-weekly glucagon-like peptide-1 receptor agonist, which has been on the market in the USA since 2014. Dulaglutide has performed well in head-to-head studies against metformin, glargine, and sitagliptin, where its A1c lowering ranged from -0.78% to -1.64% over 52-104 weeks, and it consistently outperformed each of these agents. As an add-on therapy, dulaglutide provided additional A1c lowering of -1.4% to -1.44% over monotherapy with glimepiride or glargine at 24 and 28 weeks, respectively...
2018: Diabetes, Metabolic Syndrome and Obesity: Targets and Therapy
https://www.readbyqxmd.com/read/29779845/effects-of-estradiol-on-lactoprivic-signaling-of-the-hindbrain-upon-the-contraregulatory-hormonal-response-and-metabolic-neuropeptide-synthesis-in-hypoglycemic-female-rats
#11
Santosh K Mandal, Prem K Shrestha, Fahaad S H Alenazi, Manita Shakya, Hussain N Alhamami, Karen P Briski
BACKGROUND: Caudal dorsomedial hindbrain detection of hypoglycemia-associated lactoprivation regulates glucose counter-regulation in male rats. In females, estradiol (E) determines hypothalamic neuroanatomical and molecular foci of hindbrain energy sensor activation. This study investigated the hypothesis that E signal strength governs metabolic neuropeptide and counter-regulatory hormone responses to hindbrain lactoprivic stimuli in hypoglycemic female rats. METHODS: Ovariectomized animals were implanted with E-filled silastic capsules [30 (E-30) or 300 μg (E-300)/mL] to replicate plasma concentrations at estrous cycle nadir versus peak levels...
May 17, 2018: Neuropeptides
https://www.readbyqxmd.com/read/29779472/effect-of-body-weight-on-metabolic-hormones-and-fatty-acid-metabolism-in-follicular-fluid-of-women-undergoing-in-vitro-fertilization-a-pilot-study
#12
Laurice Bou Nemer, Haolin Shi, Bruce Richard Carr, Ruth Ann Word, Orhan Bukulmez
INTRODUCTION: Obesity is an epidemic affecting more than one-third of adults in the United States. Obese women experience decreased fertility, explained in part by oocyte quality. Since follicular fluid (FF) provides an important microenvironment for oocyte growth, we sought to evaluate the effect of increased body weight on FF levels of 11 metabolic hormones and fatty acid metabolism. METHODS: The FF was collected from 25 women (10 normal weight, 10 overweight, and 5 obese) with diminished ovarian reserve undergoing in vitro fertilization (IVF) following a minimal stimulation protocol...
January 1, 2018: Reproductive Sciences
https://www.readbyqxmd.com/read/29778663/glp-1-receptor-agonists-and-reduction-of-cardiometabolic-risk-potential-underlying-mechanisms
#13
REVIEW
Manfredi Rizzo, Dragana Nikolic, Angelo Maria Patti, Carlo Mannina, Giuseppe Montalto, Brooke S McAdams, Ali A Rizvi, Francesco Cosentino
Type 2 diabetes mellitus (T2DM) is a metabolic condition with an elevated impact on cardiovascular (CV) risk. The innovative therapeutic approaches for T2DM - incretin-based therapies (IBTs), including glucagon-like peptide 1 (GLP-1) receptor agonists, have become popular and more widely used in recent years. The available scientific data from clinical studies and clinical practice highlights their beyond glucose-lowering effects, which is achieved without any increase in hypoglycaemia. The former effects include reduction in body weight, lipids, blood pressure, inflammatory markers, oxidative stress, endothelial dysfunction, and subclinical atherosclerosis, thus reducing and potentially preventing CV events...
May 17, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29777919/brain-to-bone-what-is-the-contribution-of-the-brain-to-skeletal-homeostasis
#14
REVIEW
Anna Idelevich, Roland Baron
The brain, which governs most, if not all, physiological functions in the body, from the complexities of cognition, learning and memory, to the regulation of basal body temperature, heart rate and breathing, has long been known to affect skeletal health. In particular, the hypothalamus - located at the base of the brain in close proximity to the medial eminence, where the blood-brain-barrier is not as tight as in other regions of the brain but rather "leaky", due to fenestrated capillaries - is exposed to a variety of circulating body cues, such as nutrients (glucose, fatty acids, amino acids), and hormones (insulin, glucagon, leptin, adiponectin) [1-3]...
May 16, 2018: Bone
https://www.readbyqxmd.com/read/29777704/dietary-mung-bean-protein-reduces-high-fat-diet-induced-weight-gain-by-modulating-host-bile-acid-metabolism-in-a-gut-microbiota-dependent-manner
#15
Akiho Nakatani, Xuan Li, Junki Miyamoto, Miki Igarashi, Hitoshi Watanabe, Asuka Sutou, Keita Watanabe, Takayasu Motoyama, Nobuhiko Tachibana, Mitsutaka Kohno, Hiroshi Inoue, Ikuo Kimura
The 8-globulin-rich mung bean protein (MPI) suppresses hepatic lipogenesis in rodent models and reduces fasting plasma glucose and insulin levels in obese adults. However, its effects on mitigating high fat diet (HFD)-induced obesity and the mechanism underlying these effects remain to be elucidated. Herein, we examined the metabolic phenotype, intestinal bile acid (BA) pool, and gut microbiota of conventionally raised (CONV-R) male C57BL/6 mice and germ-free (GF) mice that were randomized to receive either regular HFD or HFD containing mung bean protein isolate (MPI) instead of the dairy protein present in regular HFD...
May 16, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29777703/bacterial-metabolite-s-equol-modulates-glucagon-like-peptide-1-secretion-from-enteroendocrine-l-cell-line-glutag-cells-via-actin-polymerization
#16
Kazuki Harada, Shoko Sada, Hidekazu Sakaguchi, Mai Takizawa, Rika Ishida, Takashi Tsuboi
S-equol is one of gut bacterial metabolites produced from soybean isoflavone daizein. While S-equol is known to promote glucose-induced insulin secretion from pancreatic β cells, whether S-equol affects glucagon-like peptide-1 (GLP-1) secretion from enteroendoceine L cells remains unclear. Here we assessed the effect of S-equol on GLP-1 secretion from mouse enteroendocrine L cell line GLUTag cells. GLUTag cells expressed GPR30 and estrogen receptors, which are putative S-equol receptors. Application of S-equol induced an increase in intracellular Ca2+ levels via GPR30...
May 16, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29777589/low-adhesive-ethylene-vinyl-alcohol-based-packaging-to-xenogeneic-islets-encapsulation-for-type-1-diabetes-treatment
#17
Kai-Chiang Yang, Goichi Yanai, Sin-Yu Yang, Priyadarshini Canning, Yoshio Satou, Masako Kawagoe, Shoichiro Sumi
Transplantation of encapsulated porcine islets is proposed to treat type 1 diabetes. However, envelopment of fibrous tissue and infiltration of immune cells impair islets function and eventually cause implant failure. It is known that hemodialysis using an ethylene vinyl alcohol (EVOH) membrane results in minor tissue responses. Therefore, we hypothesized that using a low adhesive EVOH membrane for encapsulation may prevent host cell accumulation and fibrous capsule formation. In this study, rat islets suspended in chitosan gel were encapsulated in bags made from highly porous EVOH membranes, and their in vitro insulin secretion function as well as in vivo performance were evaluated...
May 19, 2018: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/29777582/comparative-study-of-liraglutide-and-insulin-glargine-on-glycemic-control-and-pancreatic-%C3%AE-cell-function-in-db-db-mice
#18
Yanli Li, Jia Zheng, Yunfeng Shen, Wangen Li, Meimei Liu, Jun Wang, Surong Zhu, Meihua Wu
BACKGROUND The aim of this study was to compare the effects of liraglutide, a long-acting glucagon-like peptide-1 (GLP-1) receptor agonist, and insulin glargine, a long-acting insulin analog, on glycemic control and pancreatic β-cell function in db/db mice. MATERIAL AND METHODS Eight-week-old male db/db mice (n=40) were divided into five groups: the vehicle-treated group (VG) (n=8); the insulin glargine-treated group (GG) (dose, 450 mg/kg) (n=8), the low-dose liraglutide-treated group (LLG) (dose, 75 μg/kg) (n=8), the mid-dose liraglutide-treated group (MLG) (150 μg/kg) (n=8), and the high-dose liraglutide-treated group (HLG) (300 μg/kg) (n=8), treated with subcutaneous injection once daily, from 8-14 weeks-of-age...
May 19, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29776987/mini-dose-glucagon-as-a-novel-approach-to-prevent-exercise-induced-hypoglycemia-in-type-1-diabetes
#19
Michael R Rickels, Stephanie N DuBose, Elena Toschi, Roy W Beck, Alandra S Verdejo, Howard Wolpert, Martin J Cummins, Brett Newswanger, Michael C Riddell
OBJECTIVE: Patients with type 1 diabetes who do aerobic exercise often experience a drop in blood glucose concentration that can result in hypoglycemia. Current approaches to prevent exercise-induced hypoglycemia include reduction in insulin dose or ingestion of carbohydrates, but these strategies may still result in hypoglycemia or hyperglycemia. We sought to determine whether mini-dose glucagon (MDG) given subcutaneously before exercise could prevent subsequent glucose lowering, and to compare the glycemic response to current approaches for mitigating exercise-associated hypoglycemia...
May 18, 2018: Diabetes Care
https://www.readbyqxmd.com/read/29776968/liraglutide-modulates-appetite-and-body-weight-via-glp-1r-expressing-glutamatergic-neurons
#20
Jessica M Adams, Hongjuan Pei, Darleen A Sandoval, Randy J Seeley, Rui B Chang, Stephen D Liberles, David P Olson
Glucagon-like peptide-1 receptor (GLP-1R) agonists are FDA-approved weight loss drugs. Despite their widespread use, the sites of action through which GLP-1R agonists (GLP1RAs) impact appetite and body weight are still not fully understood. Here, we determined whether GLP-1Rs in either GABAergic or glutamatergic neurons are necessary for the acute and chronic effects of the GLP1RA liraglutide on food intake, visceral illness, body weight and neural network activation. We found that mice lacking GLP-1Rs in vGAT -expressing GABAergic neurons responded identically to controls in all parameters measured, whereas deletion of GLP-1Rs in vGlut2 -expressing glutamatergic neurons eliminated liraglutide-induced weight loss and visceral illness and severely attenuated its effects on feeding...
May 18, 2018: Diabetes
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