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Beta cell function

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https://www.readbyqxmd.com/read/29150992/accelerated-aging-and-aging-process-in-the-brain
#1
Nickolay K Isaev, Elisaveta E Genrikhs, Maria V Oborina, Elena V Stelmashook
One of the approaches to the research of the problem of aging is the study of genetic pathologies leading to accelerated aging, such as the Hutchinson-Gilford progeria syndrome, Werner syndrome, and Down syndrome. Probably, this approach can be used in an attempt to understand the neuronal mechanisms underlying normal and pathological brain aging. The analysis of the current state of scientific knowledge about these pathologies shows that in the Hutchinson-Gilford progeria and Werner syndrome, the rate of brain aging is significantly lower than the rate of whole body aging, whereas in Down syndrome, the brain ages faster than other organs due to amyloid-beta accumulation and chronic oxidative stress in the brain tissue...
November 18, 2017: Reviews in the Neurosciences
https://www.readbyqxmd.com/read/29150935/generation-of-insulin-producing-cells-from-human-adipose-derived-mesenchymal-stem-cells-on-pva-scaffold-by-optimized-differentiation-protocol
#2
Seyed Ehsan Enderami, Masoud Soleimani, Yousef Mortazavi, Samad Nadri, Ali Salimi
The studies have been done on patient-specific human adipose-derived from mesenchymal stem cells (hADSCs) like a series of autologous growth factors and nanofibrous scaffolds (3D culture) will probably have many benefits for regenerative medicine in type 1 diabetes mellitus (TIDM) patients in the future. For this purpose, we established a polyvinyl alcohol (PVA) scaffold and a differentiation protocol by adding platelet-rich plasma (PRP) that induces the hADSCs into insulin-producing cells (IPCs). The Characteristics of the derived IPCs in 3D culture were compared with conventional culture (2D) groups evaluated at the mRNA and protein levels...
November 18, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29150918/central-role-of-transforming-ggrowth-factor-type-beta-1-in-skeletal-muscle-dysfunctions-an-update-on-therapeutic-strategies
#3
Johanna Abrigo, Felipe Simon, Daniel Cabrera, Gonzalo Cordova, Capucine Trollet, Claudio Cabello Verrugio
Among the soluble factors that regulate skeletal muscle function, Transforming Growth Factor type Beta 1 (TGF-b1) is one of the most studied. This factor inhibits myogenesis and regeneration by regulating the activity and function of satellite cells (SCs). Indeed, TGF-b has a central role in muscle pathologies in which there is development of fibrosis and/or atrophy of skeletal muscle. Thus, in this review we present the critical and recent antecedents regarding the mechanisms and cellular targets involved in the effects of TGF-b1 in the muscle, in pathological processes such as the inhibition of regeneration, fibrosis and atrophy...
November 16, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/29150558/branched-pectic-galactan-in-phloem-sieve-element-cell-walls-implications-for-cell-mechanics
#4
Thomas A Torode, Rachel E O'Neill, Susan E Marcus, Valerie Cornuault, Sara Pose-Albacete, Rebecca P Lauder, Stjepan Kresimir Kracun, Maja Gro Rydahl, Mathias C F Andersen, William George Tycho Willats, Siobhan Ariel Braybrook, Belinda J Townsend, Mads H Clausen, J Paul Knox
A major question in plant biology concerns the specification and functional differentiation of cell types. This is in the context of constraints imposed by networks of cell walls that both adhere cells and contribute to the form and function of developing organs. Here, we report the identification of a glycan epitope that is specific to phloem sieve element cell walls in several systems. A monoclonal antibody, designated LM26, binds to the cell wall of phloem sieve elements in stems of Arabidopsis thaliana, Miscanthus x giganteus and notably sugar beet (Beta vulgaris) roots where phloem identification is an important factor for the study of phloem unloading of sucrose...
November 17, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29150402/network-science-of-biological-systems-at-different-scales-a-review
#5
REVIEW
Marko Gosak, Rene Markovič, Jurij Dolenšek, Marjan Slak Rupnik, Marko Marhl, Andraž Stožer, Matjaž Perc
Network science is today established as a backbone for description of structure and function of various physical, chemical, biological, technological, and social systems. Here we review recent advances in the study of complex biological systems that were inspired and enabled by methods of network science. First, we present research highlights ranging from determination of the molecular interaction network within a cell to studies of architectural and functional properties of brain networks and biological transportation networks...
November 3, 2017: Physics of Life Reviews
https://www.readbyqxmd.com/read/29149826/novel-functions-of-microrna-17-92-cluster-in-the-endocrine-system
#6
Shan Wan, Xiang Chen, Yuedong He, Xijie Yu
BACKGROUND: MiR-17-92 cluster is coded by MIR17HG in chromosome 13, which is highly conserved in vertebrates. Published literatures have proved that miR-17-92 cluster critically regulates tumorigenesis and metastasis. Recent researches showed that the miR-17-92 cluster also plays novel functions in the endocrine system. OBJECTIVE: To summarize recent findings on the physiological and pathological roles of miR-17-92 cluster in bone, lipid and glucose metabolisms...
November 17, 2017: Current Drug Targets
https://www.readbyqxmd.com/read/29149782/frequency-of-circulatory-regulatory-immune-cells-in-iranian-patients-with-type-1-diabetes
#7
Tahereh Khamehchian, Eqlim Nemati, Marziyeh Jazayeri, Shirin Azimi, Hassan Nikoueinejad, Hossein Akbari, Behnaz Irandoust
Type 1 diabetes (T1D) is the result of the autoimmune destruction of insulin-producing beta cells. Regulatory T cells (Tregs) and plasmacytoid dendritic cells (PDCs) act as mediators of peripheral tolerance. We investigated the possible alterations of such cells in peripheral blood of patients with T1D compared to normal individuals. This comparison may lead to a better understanding of the immunopathogenesis processes involved in T1D. 92 participants, including 49 patients with T1D and 43 healthy controls were studied...
October 2017: Iranian Journal of Allergy, Asthma, and Immunology
https://www.readbyqxmd.com/read/29147967/association-of-inflammatory-bowel-disease-with-arthritis-evidence-from-in-silico-gene-expression-patterns-and-network-topological-analysis
#8
Anukriti Verma, Pallavi Somvanshi, Shafiul Haque, Bhawna Rathi, Shivani Sharda
Inflammatory bowel disease (IBD) is an idiopathic prolonged ailment accountable for inflammatory conditions of the intestine. Moreover, arthritis is responsible for joints' stiffness and painful inflammation. IBD shows certain articular extra-intestinal manifestations associating IBD with arthritis. IBD associated arthritis is found to be linked with ankylosing spondylitis (AS). The present study insights for the potential and putative drug targets and biomarkers of IBD associated with arthritis using in silico approaches...
November 17, 2017: Interdisciplinary Sciences, Computational Life Sciences
https://www.readbyqxmd.com/read/29147909/the-role-of-the-antioxidant-protein-dj-1-in-type-2-diabetes-mellitus
#9
Daniel Eberhard, Eckhard Lammert
Type 2 diabetes mellitus (T2DM) is a worldwide escalating health disorder resulting from insulin resistance and functional loss of insulin-producing beta cells that finally cause chronically elevated blood glucose concentrations. Here we review the role of ubiquitously expressed antioxidant protein DJ-1 in the pathogenesis of T2DM. In beta cells, DJ-1 protects against oxidative stress, endoplasmic reticulum stress, and streptozotocin- and cytokine-induced stress and preserves beta cell viability and insulin secretion...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29146881/beta-adrenergic-signaling-impairs-anti-tumor-cd8-t-cell-responses-to-b-cell-lymphoma-immunotherapy
#10
Michael D Nissen, Erica K Sloan, Stephen R Mattarollo
Beta-adrenergic receptor (betaAR) signaling regulates many physiological processes, including immune system responses. There is growing evidence also for betaAR-induced modulation of cancer growth and metastasis. In the Eu-myc mouse model of B-cell lymphoma, we investigated the effects of chronically elevated betaAR signaling on lymphoma progression and anti-tumor immunity, as well as the impact on cancer immunotherapy. Chronic treatment with the non-selective beta-agonist isoprenaline promoted lymphoma development in a manner dependent on signaling within the hematopoietic compartment...
November 16, 2017: Cancer Immunology Research
https://www.readbyqxmd.com/read/29145503/zinc-sulfate-contributes-to-promote-telomere-length-extension-via-increasing-telomerase-gene-expression-telomerase-activity-and-change-in-the-tert-gene-promoter-cpg-island-methylation-status-of-human-adipose-derived-mesenchymal-stem-cells
#11
Raheleh Farahzadi, Ezzatollah Fathi, Seyed Alireza Mesbah-Namin, Nosratollah Zarghami
The use of mesenchymal stem cells (MSCs) for cell therapy and regenerative medicine has received widespread attention over the past few years, but their application can be complicated by factors such as reduction in proliferation potential, the senescent tendency of the MSCs upon expansion and their age-dependent decline in number and function. It was shown that all the mentioned features were accompanied by a reduction in telomerase activity and telomere shortening. Furthermore, the role of epigenetic changes in aging, especially changes in promoter methylation, was reported...
2017: PloS One
https://www.readbyqxmd.com/read/29145194/deficiency-of-functional-iron-sulfur-domains-in-abce1-inhibits-the-proliferation-and-migration-of-lung-adenocarcinomas-by-regulating-the-biogenesis-of-beta-actin-in-vitro
#12
Qian Yu, Xu Han, Da-Li Tian
BACKGROUND/AIMS: ATP-binding cassette transporter E1 (ABCE1), a unique ABC superfamily member that bears two Fe-S clusters, is essential for metastatic progression in lung cancer. Fe-S clusters within ABCE1 are crucial for ribosome dissociation and translation reinitiation; however, whether these clusters promote tumor proliferation and migration is unclear. METHODS: The interaction between ABCE1 and β-actin was confirmed using GST pull-down. The lung adenocarcinoma (LUAD) cell line A549 was transduced with lentiviral packaging vectors overexpressing either wild-type ABCE1 or ABCE1 with Fe-S cluster deletions (ΔABCE1)...
November 17, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29144809/preserved-proinsulin-secretion-in-long-standing-type-1-diabetes
#13
Devin W Steenkamp, Jose M Cacicedo, Ayse Sahin-Efe, Catherine Sullivan, Elliot Sternthal
OBJECTIVE: Recent literature, has reported preserved residual beta cell function, (c-peptide "microsecretion") in many individuals with long standing type 1 diabetes. However, the concentrations of detectable insulin/c-peptide in the serum are usually very low, and beta cell mass is typically negligible. Proinsulin is measurable in the early years after diagnosis, consistent with the presence of residual functioning beta cells. However, individuals are not expected to secrete significant amounts of proinsulin beyond the early years after diagnosis...
November 16, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/29144805/dpp4-inhibitor-sitagliptin-as-a-potential-treatment-option-in-metformin-intolerant-obese-women-with-polycystic-ovary-syndrome-a-pilot-randomized-study
#14
Simona Ferjan, Andrej Janez, Mojca Jensterle
OBJECTIVE: Metformin has an established role in the management of polycystic ovary syndrome (PCOS). Some patients cannot tolerate it due to associated gastrointestinal adverse events. The present study evaluated DPP4 inhibitor sitagliptin as a potential treatment option in metformin intolerant PCOS. DESIGN: We conducted a 12-week prospective randomized open-label study with 30 obese metformin intolerant women with PCOS (aged 35.0±7.2 years, BMI 36.9±5.5 kg/m(2))...
November 16, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/29142396/antioxidant-and-cholinesterase-inhibitory-activities-of-ethyl-acetate-extract-of-terminalia-chebula-cell-free-in-vitro-and-in-silico-studies
#15
Mohamed Asik Rajmohamed, Suganthy Natarajan, Premkumar Palanisamy, Akbarsha Mohammad Abdulkader, Archunan Govindaraju
Background: Alzheimer's disease (AD) is a progressive neurodegenerative disorder clinically characterized by memory loss and impaired cognitive function. Cholinergic enzyme deficiency and oxidative stress are the two major factors implicated in the pathogenesis of AD. The symptomatic treatment, as of now, is the use of cholinesterase inhibitors toward cholinergic "downturn." Therefore, there is a search for compounds that will be useful in focused therapies. There has been suggestion that Terminalia chebula fruit would be a potential source...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142288/identification-of-small-rnas-abundant-in-burkholderia-cenocepacia-biofilms-reveal-putative-regulators-with-a-potential-role-in-carbon-and-iron-metabolism
#16
Andrea Sass, Sanne Kiekens, Tom Coenye
Small RNAs play a regulatory role in many central metabolic processes of bacteria, as well as in developmental processes such as biofilm formation. Small RNAs of Burkholderia cenocepacia, an opportunistic pathogenic beta-proteobacterium, are to date not well characterised. To address that, we performed genome-wide transcriptome structure analysis of biofilm grown B. cenocepacia J2315. 41 unannotated short transcripts were identified in intergenic regions of the B. cenocepacia genome. 15 of these short transcripts, highly abundant in biofilms, widely conserved in Burkholderia sp...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29140251/vg1-nodal-heterodimers-are-the-endogenous-inducers-of-mesendoderm
#17
Tessa Grace Montague, Alexander F Schier
Nodal is considered the key inducer of mesendoderm in vertebrate embryos and embryonic stem cells. Other TGF-beta-related signals, such as Vg1/Dvr1/Gdf3, have also been implicated in this process but their roles have been unclear or controversial. Here we report that zebrafish embryos without maternally provided vg1 fail to form endoderm and head and trunk mesoderm, and closely resemble nodal loss-of-function mutants. Although Nodal is processed and secreted without Vg1, it requires Vg1 for its endogenous activity...
November 15, 2017: ELife
https://www.readbyqxmd.com/read/29140182/tgf-%C3%AE-1-and-cxcl12-modulate-proliferation-and-chemotherapy-sensitivity-of-acute-myeloid-leukemia-cells-co-cultured-with-multipotent-mesenchymal-stromal-cells
#18
Roland Christian Schelker, Sabine Iberl, Gunnar Müller, Christina Hart, Wolfgang Herr, Jochen Grassinger
OBJECTIVES: Multipotent mesenchymal stromal cells (MSCs) play a central role within the bone marrow (BM) niche, supporting hematopoiesis via soluble factors like cytokines and chemokines. In our study, we sought to investigate the effect of blocking transforming growth factor beta 1 (TGF-β1) and C-X-C motif chemokine 12 (CXCL12) receptor CXCR4 on acute myeloid leukemia (AML) cells in an MSC co-culture system. METHODS: Human MSCs were obtained by BM aspirates and their phenotype and functional properties were confirmed in vitro...
November 15, 2017: Hematology (Amsterdam, Netherlands)
https://www.readbyqxmd.com/read/29139561/the-novel-potent-and-highly-selective-5-ht4-receptor-agonist-yh12852-significantly-improves-both-upper-and-lower-gastrointestinal-motility
#19
Eun Jeong Jeong, Soo Yong Chung, Han Na Hong, Se-Woong Oh, Jae Young Sim
BACKGROUND AND PURPOSE: 5-HT4 receptor agonists have been shown to be effective to treat various gastrointestinal tract disorders. However, a lack of selectivity against off-targets has been a limiting factor. EXPERIMENTAL APPROACH: The binding affinity and selectivity of YH12852 for human 5-HT4(a) receptor in CHO-K1 cells were evaluated using radioligand binding assays, and agonistic activity was assessed using a beta-lactamase reporter system. Contractile activity and propulsive motility were measured in isolated guinea pig distal colon...
November 15, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/29137280/ppar%C3%AE-sumoylation-mediated-lipid-accumulation-in-lung-cancer
#20
Ai N H Phan, Vu T A Vo, Tuyen N M Hua, Min-Kyu Kim, Se-Young Jo, Jong-Whan Choi, Hyun-Won Kim, Jaekyoung Son, Young-Ah Suh, Yangsik Jeong
Metabolic reprogramming as a crucial emerging hallmark of cancer is critical for tumor cells to maintain cellular bioenergetics, biosynthesis and reduction/oxidation (REDOX) balance. Peroxisome proliferator-activated receptor gamma (PPARγ) is a nuclear hormone receptor regulating transcription of diverse gene sets involved in inflammation, metabolism, and suppressing tumor growth. Thiazolidinediones (TZDs), as selective PPARγ ligands, are insulin-sensitizing drugs widely prescribed for type 2 diabetic patients in the clinic...
October 10, 2017: Oncotarget
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