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Beta cell mass

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https://www.readbyqxmd.com/read/28103285/radioiodinated-exendin-4-is-superior-to-the-radiometal-labelled-glucagon-like-peptide-1-receptor-probes-overcoming-their-high-kidney-uptake
#1
Tilman Läppchen, Roswitha Tönnesmann, Jos Eersels, Philipp T Meyer, Helmut R Maecke, Svetlana N Rylova
GLP-1 receptors are ideal targets for preoperative imaging of benign insulinoma and for quantifying the beta cell mass. The existing clinical tracers targeting GLP-1R are all agonists with low specific activity and very high kidney uptake. In order to solve those issues we evaluated GLP-1R agonist Ex-4 and antagonist Ex(9-39) radioiodinated at Tyr40 side by side with [Nle14,Lys40(Ahx-DOTA-68Ga)NH2]Ex-4 (68Ga-Ex-4) used in the clinic. The Kd, Bmax, internalization and binding kinetics of [Nle14,125I-Tyr40-NH2]Ex-4 and [Nle14,125I-Tyr40-NH2]Ex(9-39) were studied in vitro using Ins-1E cells...
2017: PloS One
https://www.readbyqxmd.com/read/28095285/urine-levels-of-phthalate-metabolites-and-bisphenol-a-in-relation-to-main-metabolic-syndrome-components-dyslipidemia-hypertension-and-type-2-diabetes-a-pilot-study
#2
Roman Piecha, Štěpán Svačina, Marek Malý, Karel Vrbík, Zdenka Lacinová, Martin Haluzík, Jana Pavloušková, Adam Vavrouš, Dagmar Matějková, Dana Müllerová, Miloš Mráz, Martin Matoulek
AIM: Human exposure to organic pollutants (some of them also called endocrine disruptors) can be associated with adverse metabolic health outcomes including type 2 diabetes. The goal of this study was to compare the urine levels of bisphenol A and phthalate metabolites in subgroups of patients with metabolic syndrome composed of patients with and without three important components of metabolic syndrome (hypertension, dyslipidemia and diabetes). METHODS: We have investigated 24 hr urine samples of 168 patients with metabolic syndrome from the Metabolic Outpatient Department of General University Hospital in Prague...
December 2016: Central European Journal of Public Health
https://www.readbyqxmd.com/read/28079868/cdc123-camk1d-gene-rs12779790-polymorphism-and-rs10811661-polymorphism-upstream-of-the-cdkn2a-2b-gene-in-women-with-gestational-diabetes
#3
M Tarnowski, D Malinowski, K Safranow, V Dziedziejko, A Pawlik
OBJECTIVE: Gestational diabetes mellitus (GDM) is carbohydrate intolerance occurring in pregnant women. CDC123/CAMK1D and CDKN2A/2B are associated with increased risk of type 2 diabetes and may affect pancreatic beta cell function. The aim of this study was to examine the association between CDKN2A/2B rs10811661 and CDC123/CAMK1D rs12779790 gene polymorphisms and GDM. STUDY DESIGN: This study included 411 pregnant women. The diagnosis of GDM was based on the International Association of Diabetes and Pregnancy Study Groups criteria...
January 12, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28078385/glucose-and-fatty-acids-synergistically-and-reversibly-promote-beta-cell-proliferation-in-rats
#4
Valentine S Moullé, Kevin Vivot, Caroline Tremblay, Bader Zarrouki, Julien Ghislain, Vincent Poitout
AIMS/HYPOTHESIS: The mechanisms underlying pancreatic islet mass expansion have attracted considerable interest as potential therapeutic targets to prevent or delay the onset of type 2 diabetes. While several factors promoting beta cell proliferation have been identified, in the context of nutrient excess the roles of glucose or NEFA in relation to insulin resistance remain unclear. Here we tested the hypothesis that glucose and NEFA synergistically and reversibly promote beta cell proliferation in the context of nutrient-induced insulin resistance...
January 11, 2017: Diabetologia
https://www.readbyqxmd.com/read/28077579/neuron-enriched-rna-binding-proteins-regulate-pancreatic-beta-cell-function-and-survival
#5
Jon Agraves Juan-Mateu, Tatiana H Rech, Olatz Villate, Esther Lizarraga-Mollinedo, Anna Wendt, Jean-Valery Turatsinze, Leticia A Brondani, Tarlliza R Nardelli, Tatiane C Nogueira, Jonatan L S Esguerra, Maria In Ecircs Alvelos, Piero Marchetti, Lena Eliasson, D Eacutecio L Eizirik
Pancreatic beta cell failure is the central event leading to diabetes. Beta cells share many phenotypic traits with neurons, and proper beta cell function relies on the activation of several neuronal-like transcription programs. Regulation of gene expression by alternative splicing plays a pivotal role in brain, where it affects neuronal development, function and disease. The role of alternative splicing in beta cells remains unclear, but recent data indicate that splicing alterations modulated by both inflammation and susceptibility genes for diabetes contribute to beta cell dysfunction and death...
January 11, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28074714/oncocytic-carcinoma-of-the-salivary-gland-in-a-dog
#6
Rei Nakahira, Masaki Michishita, Misaki Kato, Yuki Okuno, Hitoshi Hatakeyama, Hisashi Yoshimura, Daigo Azakami, Kazuhiko Ochiai, Makoto Bonkobara, Kimimasa Takahashi
A 3-y-old male miniature Dachshund was presented with an ~0.8 cm diameter mass in the right mandibular region. Fourteen months later, the mass was 5 × 4 × 3 cm. Grossly, the mass was encapsulated and was homogeneously gray-white on cut surface. Microscopically, the mass was composed of large, round to polygonal tumor cells that were arranged in solid nests and cords separated by a fibrovascular stroma. Tumor cells had large, round, hypochromatic nuclei containing large prominent nucleoli and abundant eosinophilic cytoplasm containing dark blue granules visible with phosphotungstic acid-hematoxylin stain...
January 2017: Journal of Veterinary Diagnostic Investigation
https://www.readbyqxmd.com/read/28069397/influence-of-neuropeptide-y-and-pancreatic-polypeptide-on-islet-function-and-beta-cell-survival
#7
Dawood Khan, Srividya Vasu, R Charlotte Moffett, Nigel Irwin, Peter R Flatt
BACKGROUND: In the present study we assessed the impact of neuropeptide Y receptor (NPYR) modulators, neuropeptide Y (NPY) and pancreatic polypeptide (PP), on islet function and beta-cell survival. METHODS: The effects of NPY and PP on beta-cell function were examined in BRIN BD11 and 1.1B4 beta-cells, as well as isolated mouse islets. Involvement of both peptides in pancreatic islet adaptations to streptozotocin and hydrocortisone, as well as effects on beta-cell proliferation and apoptosis was also evaluated...
January 6, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28067253/whole-organ-and-islet-of-langerhans-dosimetry-for-calculation-of-absorbed-doses-resulting-from-imaging-with-radiolabeled-exendin
#8
Inge van der Kroon, Wietske Woliner-van der Weg, Maarten Brom, Lieke Joosten, Cathelijne Frielink, Mark W Konijnenberg, Eric P Visser, Martin Gotthardt
Radiolabeled exendin is used for non-invasive quantification of beta cells in the islets of Langerhans in vivo. High accumulation of radiolabeled exendin in the islets raised concerns about possible radiation-induced damage to these islets in man. In this work, islet absorbed doses resulting from exendin-imaging were calculated by combining whole organ dosimetry with small scale dosimetry for the islets. Our model contains the tissues with high accumulation of radiolabeled exendin: kidneys, pancreas and islets...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28053877/metabolomic-analysis-identifies-differentially-produced-oral-metabolites-including-the-oncometabolite-2-hydroxyglutarate-in-patients-with-head-and-neck-squamous-cell-carcinoma
#9
Pranab K Mukherjee, Pauline Funchain, Mauricio Retuerto, Richard J Jurevic, Nicole Fowler, Brian Burkey, Charis Eng, Mahmoud A Ghannoum
BACKGROUND: Metabolomics represents a promising approach for discovering novel targets and biomarkers in head and neck squamous cell carcinoma (HNSCC). Here we used metabolomics to identify oral metabolites associated with HNSCC. METHODS: Tumor and adjacent normal tissue from surgical resections and presurgical oral washes as well as oral washes were collected from healthy participants. Metabolites extractions of these samples were analyzed by liquid chromatography-mass spectroscopy (LC/MS), LC/MS/MS and gas chromatography-MS (GC/MS)...
June 2017: BBA Clinical
https://www.readbyqxmd.com/read/28035763/circulating-milk-fat-globule-epidermal-growth-factor-8-levels-are-increased-in-pregnancy-and-gestational-diabetes-mellitus
#10
Yuanyuan Li, Wenzhuo Ran, Jiaqiang Zhang, Shi Chen, Yihang Li, Deng Luo, Chen Wang, Weiping Jia
AIMS/INTRODUCTION: Milk fat globule-epidermal growth factor 8 (MFG-E8) is the key mediator in anti-inflammatory responses that facilitate phagocytosis of apoptotic cells and play an essential role in type 2 diabetes and pregnancy, both of which are under a low-grade inflammatory state. However, the action of MFG-E8 in gestational diabetes mellitus (GDM) is unclear. We measured for the first time plasma MFG-E8 levels in pregnancy and GDM, and elucidated possible relationships between its plasma levels and various metabolic parameters...
December 30, 2016: Journal of Diabetes Investigation
https://www.readbyqxmd.com/read/28018974/hypoxia-sensing-through-%C3%AE-adrenergic-receptors
#11
Hoi I Cheong, Kewal Asosingh, Olivia R Stephens, Kimberly A Queisser, Weiling Xu, Belinda Willard, Bo Hu, Josephine Kam Tai Dermawan, George R Stark, Sathyamangla V Naga Prasad, Serpil C Erzurum
Life-sustaining responses to low oxygen, or hypoxia, depend on signal transduction by HIFs, but the underlying mechanisms by which cells sense hypoxia are not completely understood. Based on prior studies suggesting a link between the β-adrenergic receptor (β-AR) and hypoxia responses, we hypothesized that the β-AR mediates hypoxia sensing and is necessary for HIF-1α accumulation. Beta blocker treatment of mice suppressed hypoxia induction of renal HIF-1α accumulation, erythropoietin production, and erythropoiesis in vivo...
December 22, 2016: JCI Insight
https://www.readbyqxmd.com/read/28012969/integrated-transcriptomic-and-metabolomic-analysis-shows-that-disturbances-in-metabolism-of-tumor-cells-contribute-to-poor-survival-of-rcc-patients
#12
Piotr Popławski, Takayuki Tohge, Joanna Bogusławska, Beata Rybicka, Zbigniew Tański, Victor Treviño, Alisdair R Fernie, Agnieszka Piekiełko-Witkowska
PURPOSE: Cellular metabolism of renal cell carcinoma (RCC) tumors is disturbed. The clinical significance of these alterations is weakly understood. We aimed to find if changes in metabolic pathways contribute to survival of RCC patients. MATERIAL AND METHODS: 35 RCC tumors and matched controls were used for metabolite profiling using gas chromatography-mass spectrometry and transcriptomic analysis with qPCR-arrays targeting the expression of 93 metabolic genes...
December 22, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28012279/pancreas-volume-and-fat-deposition-in-diabetes-and-normal-physiology-consideration-of-the-interplay-between-endocrine-and-exocrine-pancreas
#13
Yoshifumi Saisho
The pancreas is comprised of exocrine and endocrine components. Despite the fact that they are derived from a common origin in utero, these two compartments are often studied individually because of the different roles and functions of the exocrine and endocrine pancreas. Recent studies have shown that not only type 1 diabetes (T1D), but also type 2 diabetes (T2D), is characterized by a deficit in beta-cell mass, suggesting that pathological changes in the pancreas are critical events in the natural history of diabetes...
July 2016: Review of Diabetic Studies: RDS
https://www.readbyqxmd.com/read/28011992/appl1-prevents-pancreatic-beta-cell-death-and-inflammation-by-dampening-nf%C3%AE%C2%BAb-activation-in-a-mouse-model-of-type-1-diabetes
#14
Xue Jiang, Yawen Zhou, Kelvin K L Wu, Zhanrui Chen, Aimin Xu, Kenneth K Y Cheng
AIMS/HYPOTHESIS: Beta cell inflammation and demise is a feature of type 1 diabetes. The insulin-sensitising molecule 'adaptor protein, phosphotyrosine interacting with PH domain and leucine zipper 1' (APPL1), which contains an NH2-terminal Bin/Amphiphysin/Rvs domain, a central pleckstrin homology domain and a COOH-terminal phosphotyrosine-binding domain, has been shown to modulate inflammatory response in various cell types but its role in regulating beta cell mass and inflammation in type 1 diabetes remains unknown...
December 23, 2016: Diabetologia
https://www.readbyqxmd.com/read/28009296/human-beta-cells-produce-and-release-serotonin-to-inhibit-glucagon-secretion-from-alpha-cells
#15
Joana Almaça, Judith Molina, Danusa Menegaz, Alexey N Pronin, Alejandro Tamayo, Vladlen Slepak, Per-Olof Berggren, Alejandro Caicedo
In the pancreatic islet, serotonin is an autocrine signal increasing beta cell mass during metabolic challenges such as those associated with pregnancy or high-fat diet. It is still unclear whether serotonin is relevant for regular islet physiology and hormone secretion. Here, we show that human beta cells produce and secrete serotonin when stimulated with increases in glucose concentration. Serotonin secretion from beta cells decreases cyclic AMP (cAMP) levels in neighboring alpha cells via 5-HT1F receptors and inhibits glucagon secretion...
December 20, 2016: Cell Reports
https://www.readbyqxmd.com/read/28007617/a-novel-tandem-mass-spectrometry-method-for-first-line-screening-of-mainly-beta-thalassemia-from-dried-blood-spots
#16
Chaowen Yu, Shuodan Huang, Ming Wang, Juan Zhang, Hao Liu, Zhaojian Yuan, Xingbin Wang, Xiaoyan He, Jie Wang, Lin Zou
: Traditional methods for thalassemia screening are time-consuming and easily affected by cell hemolysis or hemoglobin degradation in stored blood samples. Tandem mass spectrometry (MS/MS) proved to be an effective technology for sickle cell disorders (SCD) screening. Here, we developed a novel MS/MS method for β-thalassemia screening from dried blood spots (DBS). Stable isotopic-labeled peptides were used as internal standards for quantification and calculation of the α:β-globin ratios...
December 20, 2016: Journal of Proteomics
https://www.readbyqxmd.com/read/28002522/primary-retroperitoneal-seminoma-embryology-histopathology-and-treatment-particularities
#17
Constantin Virgil Gîngu, Mihaela Mihai, Cătălin Baston, Mugurel Alexandru Crăsneanu, Alexandru Vladimir Dick, Vlad Olaru, Ioanel Sinescu
INTRODUCTION: Retroperitoneal seminoma is a very rare form of cancer, with embryological origin represented by primordial germ cells from the urogenital ridges left behind during the fetal development. Extragenital germ cell tumors can also occur in the mediastinum or the pineal gland. The aim of this paper is to outline the particularities and draw embryological, histopatological and treatment conclusions regarding extragonadal germ cell tumors. PATIENT AND METHODS: A 43-year-old patient without any additional pathology was admitted for anemia of unknown etiology...
2016: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/27999715/secretory-paraspinal-paraganglioma-of-thoracolumar-spine-case-report-and-review-of-literature
#18
Saad Akhtar, Sidra Sattar, Ehsan Bari, Naila Kayani, Sarosh Moeen
BACKGROUND: Pheochromocytomas are catecholamine secreting tumors of the adrenal medulla chromaffin cells, however, when present extra-adrenally they are called paragangliomas. Paragangliomas rarely produce catecholamine in excess, which is evident by clinical symptoms, urine, and blood biochemistry. Total resection of these tumors can lead to complete clinical and biochemical resolution. This case report presents the clinical features, radiological findings, and neurological outcome in a middle-aged female with a secretory paraganglioma...
2016: Surgical Neurology International
https://www.readbyqxmd.com/read/27981536/nicotinamide-phosphoribosyltransferase-enhances-beta-cell-expansion-during-pregnancy
#19
J Feng, H-Y Li, X-L Wang, Y Huo, S-X Liu, L Li
OBJECTIVE: Many factors contribute to the development of gestational diabetes mellitus (GDM). Among these factors, nicotinamide phosphoribosyltransferase (NAMPT) plays a critical role. Previous studies have demonstrated the effects of NAMPT on insulin resistance during GDM, while the effects of NAMPT on beta cells remain unknown. Here we addressed this question. PATIENTS AND METHODS: Mouse islets were isolated and transduced with adeno-associated vectors carrying NAMPT...
December 2016: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/27973548/the-chromatin-modifier-msk1-2-suppresses-endocrine-cell-fates-during-mouse-pancreatic-development
#20
Neha Bhat, Jeehye Park, Huda Y Zoghbi, J Simon C Arthur, Kenneth S Zaret
Type I diabetes is caused by loss of insulin-secreting beta cells. To identify novel, pharmacologically-targetable histone-modifying proteins that enhance beta cell production from pancreatic progenitors, we performed a screen for histone modifications induced by signal transduction pathways at key pancreatic genes. The screen led us to investigate the temporal dynamics of ser-28 phosphorylated histone H3 (H3S28ph) and its upstream kinases, MSK1 and MSK2 (MSK1/2). H3S28ph and MSK1/2 were enriched at the key endocrine and acinar promoters in E12...
2016: PloS One
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