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https://www.readbyqxmd.com/read/28101160/facile-mechanical-shaking-method-is-an-improved-isolation-approach-for-islet-preparation-and-transplantation
#1
Nina Yin, Tao Chen, Yuling Yu, Yongming Han, Fei Yan, Zhou Zheng, Zebin Chen
Successful islet isolation is crucial for islet transplantation and cell treatment for type 1 diabetes. Current isolation methods are able to obtain 500-1,000 islets per rat, which results in a waste of ≥50% of total islets. In the present study, a facile mechanical shaking method for improving islet yield (up to 1,500 per rat) was developed and summarized, which was demonstrated to be more effective than the existing well-established stationary method. The present results showed that isolated islets have a maximum yield of 1,326±152 when shaking for 15 min for the fully-cannulated pancreas...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28100774/loss-of-cyclin-dependent-kinase-2-in-the-pancreas-links-primary-%C3%AE-cell-dysfunction-to-progressive-depletion-of-%C3%AE-cell-mass-and-diabetes
#2
So Yoon Kim, Ji-Hyeon Lee, Matthew J Merrins, Oksana Gavrilova, Xavier Bisteau, Philipp Kaldis, Leslie S Satin, Sushil G Rane
The failure of pancreatic islet β-cells is a major contributor to the etiology of Type 2 diabetes. β-cell dysfunction and declining β-cell mass are two mechanisms that contribute to this failure, although it is unclear if they are molecularly linked. Here, we show that the cell cycle regulator, cyclin-dependent kinase 2 (Cdk2), couples primary β-cell dysfunction to the progressive deterioration of β-cell mass in diabetes. Mice with pancreas-specific deletion of Cdk2 are glucose intolerant primarily due to defects in glucose-stimulated insulin secretion...
January 18, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28099262/angiotensin-ii-type-2-receptor-activation-with-compound-21-augments-islet-function-and-regeneration-in-streptozotocin-induced-neonatal-rats-and-human-pancreatic-progenitor-cells
#3
Lin Wang, Yi Wang, Xing Yu Li, Po Sing Leung
OBJECTIVES: We investigated the effects of compound 21 (C21), a nonpeptide angiotensin II type 2 receptor agonist, on islet cell function and survival in streptozotocin (STZ)-treated neonatal rats and human pancreatic progenitor cells. METHODS: Neonatal rats were randomized into 5 groups, including a control, an STZ (100 mg/kg, intraperitoneally), and 3 STZ + C21 (0.25, 0.5, and 1 mg/kg per day for 7 days, intraperitoneally) groups. Body weight and blood glucose were monitored daily...
January 18, 2017: Pancreas
https://www.readbyqxmd.com/read/28094469/immunohistochemical-assessment-of-glucagon-like-peptide-1-receptor-glp-1r-expression-in-the-pancreas-of-patients-with-type-2-diabetes
#4
Rikke Kaae Kirk, Charles Pyke, Matthias G von Herrath, Jane Preuss Hasselby, Lars Pedersen, Pia Gottrup Mortensen, Lotte Bjerre Knudsen, Ken Coppieters
Glucagon-like peptide-1 (GLP-1) is an incretin hormone which stimulates insulin release and inhibits glucagon secretion from the pancreas in a glucose-dependent manner. Incretin-based therapies, consisting of GLP-1 receptor (GLP-1R) agonists and dipeptidyl peptidase-4 (DPP-4) inhibitors, are used for the treatment of T2D. Immunohistochemical studies for GLP-1R expression have previously been hampered by the use of unspecific polyclonal antibodies. This study used a new monoclonal antibody to assess GLP-1R expression in pancreatic tissue from 23 patients with T2D, including 7 with a DPP-4 inhibitor and 1 with a GLP-1R agonist treatment history...
January 17, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28071890/peptide-conjugates-of-benzene-carboxylic-acids-as-agonists-and-antagonists-of-amylin-aggregation
#5
Ruel Z B Desamero, Adam A Profit, Jayson Del Rosario Vedad
Human islet amyloid polypeptide (hIAPP), also known as amylin, is a 37 residue peptide hormone that is stored and co-secreted with insulin. hIAPP plays a pivotal role in type 2 diabetes and is the major component of amyloid deposits found in the pancreas of patients afflicted with the disease. The self-assembly of hIAPP and the formation of amyloid is linked to the death of insulin producing -cells. Recent findings suggest soluble hIAPP oligomers are the cytotoxic species responsible for -cell loss whereas amyloid fibrils themselves may indeed be innocuous...
January 10, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28067253/whole-organ-and-islet-of-langerhans-dosimetry-for-calculation-of-absorbed-doses-resulting-from-imaging-with-radiolabeled-exendin
#6
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/28049534/case-report-maternal-mosaicism-resulting-in-inheritance-of-a-novel-gata6-mutation-causing-pancreatic-agenesis-and-neonatal-diabetes-mellitus
#7
Daphne Yau, Elisa De Franco, Sarah E Flanagan, Sian Ellard, Miriam Blumenkrantz, John J Mitchell
BACKGROUND: Haploinsufficiency of the GATA6 transcription factor gene was recently found to be the most common cause of pancreatic agenesis, a rare cause of neonatal diabetes mellitus. Although most cases are de novo, we describe three siblings with inherited GATA6 haploinsufficiency and the rare finding of parental mosaicism. CASE PRESENTATION: The proband was born at term with severe intrauterine growth restriction, the first child of non-consanguineous parents...
January 3, 2017: Diagnostic Pathology
https://www.readbyqxmd.com/read/28044287/using-electrophoretic-immunoassay-to-monitor-hormone-secretion
#8
Shusheng Lu, Robert T Kennedy
It has been demonstrated that microfluidic systems allow integration of sampling, reagent mixing, and rapid electrophoretic analysis. They have also proven useful for culturing cells wherein control over the environment allows novel and automated experiments. Here, we describe a microchip-based electrophoresis assay that allows cell culture and hormone monitoring. An online gradient generator can control cell culture condition precisely. This system has been applied for Pancreas islets' glucose sensitivity studies...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28032446/magnetic-resonance-imaging-of-intra-pancreatic-ductal-nanoparticle-delivery-to-islet-cells
#9
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
#10
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/28025655/targets-and-probes-for-non-invasive-imaging-of-%C3%AE-cells
#11
REVIEW
Andreas Jodal, Roger Schibli, Martin Béhé
β-cells, located in the islets of the pancreas, are responsible for production and secretion of insulin and play a crucial role in blood sugar regulation. Pathologic β-cells often cause serious medical conditions affecting blood glucose level, which severely impact life quality and are life-threatening if untreated. With 347 million patients, diabetes is one of the most prevalent diseases, and will continue to be one of the largest socioeconomic challenges in the future. The diagnosis still relies mainly on indirect methods like blood sugar measurements...
December 26, 2016: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28025104/adrenoceptors-promote-glucose-uptake-into-adipocytes-and-muscle-by-an-insulin-independent-signalling-pathway-involving-mechanistic-target-of-rapamycin-complex-2
#12
Saori Mukaida, Bronwyn A Evans, Tore Bengtsson, Dana S Hutchinson, Masaaki Sato
Uptake of glucose into skeletal muscle and adipose tissue plays a vital role in metabolism and energy balance. Insulin released from β-islet cells of the pancreas promotes glucose uptake in these target tissues by stimulating translocation of GLUT4 transporters to the cell surface. This process is complex, involving signalling proteins including the mechanistic (or mammalian) target of rapamycin (mTOR) and Akt that intersect with multiple pathways controlling cell survival, growth and proliferation. mTOR exists in two forms, mTOR complex 1 (mTORC1), and mTOR complex 2 (mTORC2)...
December 23, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28017506/insulin-producing-cells-generation-by-overexpression-of-mir-375-in-adipose-derived-mesenchymal-stem-cells-from-diabetic-patients
#13
Mehran Piran, Seyed Ehsan Enderami, Mehrdad Piran, Hadis Soltani Sedeh, Ehsan Seyedjafari, Abdolreza Ardeshirylajimi
Diabetes Mellitus (DM) is a systematic disease, which happens because of destruction of islets of Langerhans in the pancreas and systematic resistance to insulin. The lack of donor for pancreas transplantation and risk of transplant rejection is the main challenge in the treatment of this disease. Stem cells are proper and sufficient source for creating insulin-producing cells (IPC). In this study adipose tissue was provided from diabetic patients operated for liposuction and then adipose derived stem cells (ADSCs) were isolated, characterized and then treated by lentiviruses containing miR-375, after 7, 14 and 21 days of induction, islet-like clusters (ILC) specific genes including insulin and PDX1 were evaluated by Real Time RT-PCR...
December 22, 2016: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/28011946/high-fat-diet-with-stress-impaired-islets-insulin-secretion-by-reducing-plasma-estradiol-and-pancreatic-glut2-protein-levels-in-rats-proestrus-phase
#14
M Salimi, H Zardooz, F Khodagholi, F Rostamkhani, F Shaerzadeh
This study was conducted to determine whether two estrus phases (proestrus and diestrus) in female rats may influence the metabolic response to a high-fat diet and/or stress, focusing on pancreatic insulin secretion and content. Animals were divided into high-fat and normal diet groups, then each group was subdivided into stress and non-stress groups, and finally, each one of these was divided into proestrus and diestrus subgroups. At the end of high-fat diet treatment, foot-shock stress was applied to the animals...
October 2016: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28011883/single-cell-transcriptomic-profiling-of-mouse-pancreatic-progenitors
#15
Diana E Stanescu, Reynold Yu, Kyoung Jae Won, Doris A Stoffers
The heterogeneity of the developing pancreatic epithelium and low abundance of endocrine progenitors limits the information derived from traditional expression studies. To identify genes that characterize early developmental tissues composed of multiple progenitor lineages, we applied single-cell RNA-Seq to embryonic day (e)13.5 mouse pancreata and performed integrative analysis with single cell data from mature pancreas. We identified subpopulations expressing macrophage or endothelial markers and new pancreatic progenitor markers...
December 23, 2016: Physiological Genomics
https://www.readbyqxmd.com/read/28008169/advances-in-islet-encapsulation-technologies
#16
Tejal Desai, Lonnie D Shea
Type 1 diabetes is an autoimmune disorder in which the immune system attacks and destroys insulin-producing islet cells of the pancreas. Although islet transplantation has proved to be successful for some patients with type 1 diabetes, its widespread use is limited by islet donor shortage and the requirement for lifelong immunosuppression. An encapsulation strategy that can prevent the rejection of xenogeneic islets or of stem cell-derived allogeneic islets can potentially eliminate both of these barriers. Although encapsulation technology has met several challenges, the convergence of expertise in materials, nanotechnology, stem cell biology and immunology is allowing us to get closer to the goal of encapsulated islet cell therapy for humans...
December 23, 2016: Nature Reviews. Drug Discovery
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
#17
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/28002466/assessment-of-the-role-of-metabolic-determinants-on-the-relationship-between-insulin-sensitivity-and-secretion
#18
Jose E Galgani, Carmen Gómez, Maria L Mizgier, Juan Gutierrez, Jose L Santos, Pablo Olmos, Andrea Mari
BACKGROUND: Insulin secretion correlates inversely with insulin sensitivity, which may suggest the existence of a crosstalk between peripheral organs and pancreas. Such interaction might be mediated through glucose oxidation that may drive the release of circulating factors with action on insulin secretion. AIM: To evaluate the association between whole-body carbohydrate oxidation and circulating factors with insulin secretion to consecutive oral glucose loading in non-diabetic individuals...
2016: PloS One
https://www.readbyqxmd.com/read/28000178/quercetin-potentiates-transdifferentiation-of-bone-marrow-mesenchymal-stem-cells-into-the-beta-cells-in-vitro
#19
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/27997253/the-progress-and-potential-of-proteomic-biomarkers-for-type-1-diabetes-in-children
#20
Robert Moulder, Santosh Dilip Bhosale, Riitta Lahesmaa, David Robinson Goodlett
Although it is possible to identify the genetic risk for type 1 diabetes (T1D), it is not possible to predict who will develop the disease. New biomarkers are needed that would help understand the mechanisms of disease onset and when to administer targeted therapies and interventions. Areas covered: An overview is presented of international study efforts towards understanding the cause of T1D, including the collection of several extensive temporal sample series that follow the development of T1D in at risk children...
January 2017: Expert Review of Proteomics
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