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Pancreas beta cells

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https://www.readbyqxmd.com/read/28067253/whole-organ-and-islet-of-langerhans-dosimetry-for-calculation-of-absorbed-doses-resulting-from-imaging-with-radiolabeled-exendin
#1
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/28039581/microrna-expression-profiles-of-human-ipscs-differentiation-into-insulin-producing-cells
#2
Guido Sebastiani, Marco Valentini, Giuseppina Emanuela Grieco, Giuliana Ventriglia, Laura Nigi, Francesca Mancarella, Silvia Pellegrini, Gianvito Martino, Valeria Sordi, Lorenzo Piemonti, Francesco Dotta
AIMS: MicroRNAs are a class of small noncoding RNAs, which control gene expression by inhibition of mRNA translation. MicroRNAs are involved in the control of biological processes including cell differentiation. Here, we aim at characterizing microRNA expression profiles during differentiation of human induced pluripotent stem cells (hiPSCs) into insulin-producing cells. METHODS: We differentiated hiPSCs toward endocrine pancreatic lineage following a 18-day protocol...
December 30, 2016: Acta Diabetologica
https://www.readbyqxmd.com/read/28032446/magnetic-resonance-imaging-of-intra-pancreatic-ductal-nanoparticle-delivery-to-islet-cells
#3
Ping Wang, Alana Ross, Byunghee Yoo, Jingsheng Yang, Christian Farrar, Chongzhao Ran, Pamela Pantazopoulos, Zdravka Medarova, Anna Moore
The absence of reliable drug delivery systems to pancreatic beta-cells hampers efficient treatment of type 1 diabetes. Nanoparticle delivery systems equipped with imaging capabilities could enable selective delivery to pancreatic islet cells. Biodistribution of nanoparticles is defined by several factors including the mode of administration, which determines accumulation in various organs. In this study we tested whether intra-pancreatic ductal injection of magnetic nanoparticles (MN) would result in efficient cellular uptake by pancreatic islet cells...
December 29, 2016: Diabetes/metabolism Research and Reviews
https://www.readbyqxmd.com/read/28028829/localization-of-nucleic-acid-sensing-toll-like-receptors-in-human-and-mouse-pancreas
#4
Olli Helminen, Heikki Huhta, Joonas H Kauppila, Petri P Lehenkari, Juha Saarnio, Tuomo J Karttunen
Nucleic acid-sensing toll-like receptors (TLRs) (3, 7, 8, 9) have a role both in antiviral innate immunity and in autoimmune disorders. We assessed the expression of TLR3, 7, 8 and 9 in human and mouse pancreas focusing on the subpopulations of cells in the Langerhans islets. We studied eight human samples with normal pancreatic islets and two samples from patients with type 1 diabetes. Additionally, 10 CD-1 mouse pancreases were analysed. Immunohistochemical double-stainings for the TLRs and insulin, glucagon or somatostatin, respectively, were performed along with appropriate controls...
December 28, 2016: APMIS: Acta Pathologica, Microbiologica, et Immunologica Scandinavica
https://www.readbyqxmd.com/read/28024793/recombinant-interferon-alpha-2b-is-a-high-affinity-antigen-for-type-1-diabetes-autoantibodies
#5
Wahid Ali Khan
OBJECTIVES: Type 1 diabetes results from T-cell-mediated destruction of the beta cells of the pancreas and is associated with several autoimmune phenomena. Many studies have suggested the involvement of interferon alpha (IFN α) in the development of type 1 diabetes, but the exact mechanism remains unclear. In this study, the binding of type 1 diabetes antibodies with recombinant interferon alpha-2b (hrIFN α-2b), their gene (cIFN α-2b gene) and commercially available interferon α-2b (IFN α-2b) were assessed...
December 23, 2016: Canadian Journal of Diabetes
https://www.readbyqxmd.com/read/28017702/arsenite-in-drinking-water-produces-glucose-intolerance-in-pregnant-rats-and-their-female-offspring
#6
María Marta Bonaventura, Nadia Soledad Bourguignon, Marianne Bizzozzero, Diego Rodriguez, Clara Ventura, Claudia Cocca, Carlos Libertun, Victoria Adela Lux-Lantos
Drinking water is the main source of arsenic exposure. Chronic exposure has been associated with metabolic disorders. Here we studied the effects of arsenic on glucose metabolism, in pregnant and post-partum of dams and their offspring. We administered 5 (A5) or 50 (A50) mg/L of sodium arsenite in drinking water to rats from gestational day 1 (GD1) until two months postpartum (2MPP), and to their offspring from weaning until 8 weeks old. Liver arsenic dose-dependently increased in arsenite-treated rats to levels similar to exposed population...
December 23, 2016: Food and Chemical Toxicology
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
#7
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/28003126/emerging-role-of-hippo-signalling-in-pancreatic-biology-yap-re-expression-and-plausible-link-to-islet-cell-apoptosis-and-replication
#8
REVIEW
Anjana Sharma, Veera Ganesh Yerra, Ashutosh Kumar
Diabetes mellitus is an ailment that develops when the functional capacity of the pancreas does not meet the metabolic requirements of the whole body, either due to insulin insufficiency or resistance to insulin action. Current therapies that control glycaemia are limited by their unwanted effects or their inability to prevent the development of long-term complications. Regeneration and replacement of beta cell therapies are shaping the goals of future management of diabetes. The Hippo pathway, first discovered in Drosophila melanogaster, plays a vital role in controlling the organ size...
December 18, 2016: Biochimie
https://www.readbyqxmd.com/read/28000708/protein-inhibitor-of-activated-stat-y-piasy-regulates-insulin-secretion-by-interacting-with-lim-homeodomain-transcription-factor-isl1
#9
Chengzhi Yan, Chulin Yu, Di Zhang, Yan Cui, Jinlian Zhou, Sheng Cui
It is known that the LIM homeodomain transcription factor Isl1 is highly expressed in all pancreatic endocrine cells and functions in regulating pancreatic development and insulin secretion. The Isl1 mutation has been found to be associated with type 2 diabetes, but the mechanism responsible for Isl1 regulation of insulin synthesis and secretion still needs to be elucidated. In the present study, the protein inhibitor of activated STAT Y (PIASy) was identified as a novel Isl1-interacting protein with a yeast two-hybrid system, and its interaction with Isl1 was further confirmed by a co-immunoprecipitation experiment...
December 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28000178/quercetin-potentiates-transdifferentiation-of-bone-marrow-mesenchymal-stem-cells-into-the-beta-cells-in-vitro
#10
B Miladpour, M Rasti, A A Owji, Z Mostafavipour, Z Khoshdel, A Noorafshan, F Zal
PURPOSE: Type 1 diabetes is an autoimmune disease caused by the destruction of β-cells in the pancreas. Bone marrow mesenchymal stem cells are multipotent and easy accessible adult stem cells that may provide options in the treatment of type 1 diabetes. Injured pancreatic extract can promote the differentiation of rat bone marrow mesenchymal stem cells into β-cells. We aimed to observe the effect of quercetin in differentiation and insulin secretion in β-cells. METHODS: Bone marrow mesenchymal stem cells were obtained from the tibiae of rats...
December 20, 2016: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/27965436/an-interview-with-doug-melton
#11
Aidan Maartens
Doug Melton is Xander University Professor at Harvard University, co-director of the Harvard Stem Cell Institute and a Howard Hughes Medical Institute Investigator. His lab investigates the development of the pancreas, and uses insights from this process to direct the production of insulin-producing beta cells from stem cells. We met Doug at the 2016 Society for Developmental Biology-International Society of Differentiation (SDB-ISD) joint meeting in Boston, USA, where he gave the Jean Brachet Lecture.
December 15, 2016: Development
https://www.readbyqxmd.com/read/27960073/from-bugs-to-beta-cells
#12
Yuxi Zhang, Daniel Hesselson
Certain microbes in the intestine secrete protein that stimulates the proliferation of beta cells in the pancreas during development.
December 13, 2016: ELife
https://www.readbyqxmd.com/read/27928774/a-3d-printed-anatomical-pancreas-and-kidney-phantom-for-optimizing-spect-ct-reconstruction-settings-in-beta-cell-imaging-using-111-in-exendin
#13
Wietske Woliner-van der Weg, Laura N Deden, Antoi P W Meeuwis, Maaike Koenrades, Laura H C Peeters, Henny Kuipers, Geert Jan Laanstra, Martin Gotthardt, Cornelis H Slump, Eric P Visser
BACKGROUND: Quantitative single photon emission computed tomography (SPECT) is challenging, especially for pancreatic beta cell imaging with (111)In-exendin due to high uptake in the kidneys versus much lower uptake in the nearby pancreas. Therefore, we designed a three-dimensionally (3D) printed phantom representing the pancreas and kidneys to mimic the human situation in beta cell imaging. The phantom was used to assess the effect of different reconstruction settings on the quantification of the pancreas uptake for two different, commercially available software packages...
December 2016: EJNMMI Physics
https://www.readbyqxmd.com/read/27922332/effect-of-moderate-and-high-intensity-chronic-exercise-on-the-pancreatic-islet-morphometry-in-healthy-rats-bdnf-receptor-participation
#14
Alberto Jiménez-Maldonado, Adolfo Virgen-Ortiz, Valery Melnikov, Alejandrina Rodríguez-Hernández, Armando Gamboa-Domínguez, Sergio Montero, Jesús Muñiz-Murguía, Mónica Lemus, Elena Roces de Álvarez-Buylla
A B S T R A C T The function and morphology of β-cells is largely dependent on insulin demand. As β-cells cover a bigger cell proportion in pancreas islets, changes of insulin producer cells affect the whole pancreatic islet morphology. Growth factors as the neurotrophins regulate the pancreas physiology, besides; physical exercise increases insulin sensitivity, and further modifies brain derived neurotrophic factor (BDNF) concentration in plasma. The aim of this study was to investigate the effects of chronic exercise (running in a treadmill for eight weeks) intensity on pancreatic islet morphometry in healthy state...
December 6, 2016: Islets
https://www.readbyqxmd.com/read/27920090/islet-derived-cd4-t-cells-targeting-proinsulin-in-human-autoimmune-diabetes
#15
Aaron W Michels, Laurie G Landry, Kristen A McDaniel, Liping Yu, Martha Campbell-Thompson, William W Kwok, Kenneth L Jones, Peter A Gottlieb, John W Kappler, Qizhi Tang, Bart O Roep, Mark A Atkinson, Clayton E Mathews, Maki Nakayama
Type 1 diabetes results from chronic autoimmune destruction of insulin-producing beta cells within pancreatic islets. While insulin is a critical self-antigen in animal models of autoimmune diabetes, due to extremely limited access to pancreas samples, little is known about human antigenic targets for islet-infiltrating T-cells. Here we show that proinsulin peptides are targeted by islet-infiltrating T-cells from type 1 diabetes patients. We identified hundreds of T-cells from inflamed pancreatic islets of three young type 1 diabetes organ donors with a short disease duration with high risk HLA genes using a direct T-cell receptor (TCR) sequencing approach without long-term cell culture...
December 5, 2016: Diabetes
https://www.readbyqxmd.com/read/27909574/characterization-of-5-2-18-f-fluoroethoxy-l-tryptophan-for-pet-imaging-of-the-pancreas
#16
Ahmed Abbas, Christine Beamish, Rebecca McGirr, John Demarco, Neil Cockburn, Dawid Krokowski, Ting-Yim Lee, Michael Kovacs, Maria Hatzoglou, Savita Dhanvantari
Purpose: In diabetes, pancreatic beta cell mass declines significantly prior to onset of fasting hyperglycemia. This decline may be due to endoplasmic reticulum (ER) stress, and the system L amino acid transporter LAT1 may be a biomarker of this process. In this study, we used 5-(2- (18)F-fluoroethoxy)-L-tryptophan ( (18)F-L-FEHTP) to target LAT1 as a potential biomarker of beta cell function in diabetes. Procedures: Uptake of (18)F-L-FEHTP was determined in wild-type C57BL/6 mice by ex vivo biodistribution...
2016: F1000Research
https://www.readbyqxmd.com/read/27864307/pancreatic-beta-cells-express-the-fetal-islet-hormone-gastrin-in-rodent-and-human-diabetes
#17
Tehila Dahan, Oren Ziv, Elad Horwitz, Hai Zemmour, Judith Lavi, Avital Swisa, Gil Leibowitz, Frances M Ashcroft, Peter In't Veld, Benjamin Glaser, Yuval Dor
Beta-cell failure in type 2 diabetes (T2D) was recently proposed to involve dedifferentiation of beta-cells and ectopic expression of other islet hormones, including somatostatin and glucagon. Here we show that gastrin, a stomach hormone typically expressed in the pancreas only during embryogenesis, is expressed in islets of diabetic rodents and humans with T2D. While in mice gastrin is expressed insulin+ cells, in humans with T2D gastrin expression occurs in both insulin+ and somatostatin+ cells. Genetic lineage tracing in mice indicates that gastrin expression is turned on in a subset of differentiated beta-cells following exposure to severe hyperglycemia...
November 18, 2016: Diabetes
https://www.readbyqxmd.com/read/27861351/small-amounts-of-tissue-preserve-pancreatic-function-long-term-follow-up-study-of-middle-segment-preserving-pancreatectomy
#18
Zipeng Lu, Jie Yin, Jishu Wei, Cuncai Dai, Junli Wu, Wentao Gao, Qing Xu, Hao Dai, Qiang Li, Feng Guo, Jianmin Chen, Chunhua Xi, Pengfei Wu, Kai Zhang, Kuirong Jiang, Yi Miao
Middle-segment preserving pancreatectomy (MPP) is a novel procedure for treating multifocal lesions of the pancreas while preserving pancreatic function. However, long-term pancreatic function after this procedure remains unclear.The aims of this current study are to investigate short- and long-term outcomes, especially long-term pancreatic endocrine function, after MPP.From September 2011 to December 2015, 7 patients underwent MPP in our institution, and 5 cases with long-term outcomes were further analyzed in a retrospective manner...
November 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27846263/nicotine-induced-effects-on-nicotinic-acetylcholine-receptors-nachrs-ca2-and-brain-derived-neurotrophic-factor-bdnf-in-stc-1-cells
#19
Jie Qian, Shobha K Mummalaneni, Reem M Alkahtani, Sunila Mahavadi, Karnam S Murthy, John R Grider, Vijay Lyall
In addition to the T2R bitter taste receptors, neuronal nicotinic acetylcholine receptors (nAChRs) have recently been shown to be involved in the bitter taste transduction of nicotine, acetylcholine and ethanol. However, at present it is not clear if nAChRs are expressed in enteroendocrine cells other than beta cells of the pancreas and enterochromaffin cells, and if they play a role in the synthesis and release of neurohumoral peptides. Accordingly, we investigated the expression and functional role of nAChRs in enteroendocrine STC-1 cells...
2016: PloS One
https://www.readbyqxmd.com/read/27829813/olanzapine-induced-biochemical-and-histopathological-changes-after-its-chronic-administration-in-rats
#20
Rehmat Shah, Fazal Subhan, Gowhar Ali, Ihsan Ullah, Sami Ullah, Muhammad Shahid, Nisar Ahmad, Khwaja Fawad
Objective: Olanzapine is a second generation antipsychotic acting mainly as a dopamine D2 and serotonine 5-HT2 receptors antagonist prescribed in the treatment of schizophrenia and various other psychiatric illnesses. Even though olanzapine is widely used in psychiatry, its effects on the architecture of pancreas, liver and kidneys are little known. The histology of pancreas especially has never been studied. For these reasons, the current study was designed to elucidate the toxic effects of chronic administration of olanzapine on pancreas, liver and kidneys and the enzymes released by these tissues in an escalating dose manner...
November 2016: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
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