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Beta Cell proliferation

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https://www.readbyqxmd.com/read/28319735/different-combinations-of-growth-factors-for-the-tenogenic-differentiation-of-bone-marrow-mesenchymal-stem-cells-in-monolayer-culture-and-in-fibrin-based-three-dimensional-constructs
#1
Marta Bottagisio, Silvia Lopa, Valentina Granata, Giuseppe Talò, Chiara Bazzocchi, Matteo Moretti, Arianna Barbara Lovati
Tendon injuries are severe burdens in clinics. The poor tendon healing is related to an ineffective response of resident cells and inadequate vascularization. Thanks to the high proliferation and multi-lineage differentiation capability, bone marrow-derived mesenchymal stem cells (BMSCs) are a promising cell source to support the tendon repair. To date, the association of various growth factors to induce the in vitro tenogenic differentiation of multipotent progenitor cells is poorly investigated. This study aimed to investigate the tenogenic differentiation of rabbit BMSCs by testing the combination of bone morphogenetic proteins (BMP-12 and 14) with transforming growth factor beta (TGF-β) and vascular endothelial growth factor (VEGF) both in 2D and 3D cultures within fibrin-based constructs...
March 16, 2017: Differentiation; Research in Biological Diversity
https://www.readbyqxmd.com/read/28319674/assessment-of-circulating-betatrophin-concentrations-in-lean-glucose-tolerant-women-with-polycystic-ovary-syndrome
#2
Onur Erol, Mustafa Kemal Özel, Hamit Yaşar Ellidağ, Tayfun Toptaş, Aysel Uysal Derbent, Necat Yılmaz
The aims of the current study were to investigate the betatrophin levels in lean glucose-tolerant women with polycystic ovary syndrome (PCOS), and to explore the relationships between these levels and antropometric, hormonal and metabolic parameters. The study population consisted of 50 lean (body mass index [BMI] < 25 kg/m(2)) women diagnosed with PCOS using the Rotterdam criteria, and 60 age- and BMI-matched healthy controls without any features of clinical or biochemical hyperandrogenism. Before recruitment, glucose tolerance was evaluated in all of the subjects using the 2-h 75 g oral glucose-tolerance test, and only those exhibiting normal glucose tolerance were enrolled...
March 20, 2017: Journal of Obstetrics and Gynaecology: the Journal of the Institute of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28314379/rejuvenation-by-partial-reprogramming-of-the-epigenome
#3
Andrew R Mendelsohn, James Larrick, Jennifer L Lei
Epigenetic variation with age is one of the most important hallmarks of aging. Resetting or repairing the epigenome of aging cells in intact animals may rejuvenate the cells and perhaps the entire organism. In fact, differentiated adult cells, which by definition have undergone some epigenetic changes, are capable of being rejuvenated and reprogrammed to create pluripotent stem cells and viable cloned animals. Apparently, such reprogramming is capable of completely resetting the epigenome. However, attempts to fully reprogram differentiated cells in adult animals have failed in part because reprogramming leads to formation of teratomas...
March 17, 2017: Rejuvenation Research
https://www.readbyqxmd.com/read/28303467/mir-9-5p-down-regulates-pit2-but-not-pit1-in-human-embryonic-kidney-293-cells
#4
D P Paiva, M Keasey, J R M Oliveira
Inorganic phosphate (Pi) is an essential component for structure and metabolism. PiT1 (SLC20A1) and PiT2 (SLC20A2) are members of the mammalian type-III inorganic phosphate transporters. SLC20A2 missense variants are associated with primary brain calcification. MicroRNAs (miRNAs) are endogenous noncoding regulatory RNAs, which play important roles in post-transcriptional gene regulation. MicroRNA-9 (miR-9) acts at different stages of neurogenesis, is deeply rooted in gene networks controlling the regulation of neural progenitor proliferation, and is also linked with cancers outside the nervous system...
March 16, 2017: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/28303407/evodiamine-attenuates-tgf-%C3%AE-1-induced-fibroblast-activation-and-endothelial-to-mesenchymal-transition
#5
Qing-Qing Wu, Yang Xiao, Xiao-Han Jiang, Yuan Yuan, Zheng Yang, Wei Chang, Zhou-Yan Bian, Qi-Zhu Tang
The aim of this study is to investigate the effect of evodiamine on fibroblast activation in cardiac fibroblasts and endothelial to mesenchymal transition (EndMT) in human umbilical vein endothelial cells (HUVECs). Neonatal rat cardiac fibroblasts were stimulated with transforming growth factor beta 1 (TGF-β1) to induce fibroblast activation. After co-cultured with evodiamine (5, 10 μM), the proliferation and pro-fibrotic proteins expression of cardiac fibroblasts were evaluated. HUVECs were also stimulated with TGF-β1 to induce EndMT and treated with evodiamine (5, 10 μM) at the same time...
March 16, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28299380/conditional-islet-hypovascularisation-does-not-preclude-beta-cell-expansion-during-pregnancy-in-mice
#6
Willem Staels, Yves Heremans, Gunter Leuckx, Naomi Van Gassen, Ciro Salinno, Sofie De Groef, Martine Cools, Eli Keshet, Yuval Dor, Harry Heimberg, Nico De Leu
AIMS/HYPOTHESIS: Endothelial-endocrine cell interactions and vascular endothelial growth factor (VEGF)-A signalling are deemed essential for maternal islet vascularisation, glucose control and beta cell expansion during mouse pregnancy. The aim of this study was to assess whether pregnancy-associated beta cell expansion was affected under conditions of islet hypovascularisation. METHODS: Soluble fms-like tyrosine kinase 1 (sFLT1), a VEGF-A decoy receptor, was conditionally overexpressed in maternal mouse beta cells from 1...
March 16, 2017: Diabetologia
https://www.readbyqxmd.com/read/28298922/interactions-between-ppar-gamma-and-the-canonical-wnt-beta-catenin-pathway-in-type-2-diabetes-and-colon-cancer
#7
REVIEW
Yves Lecarpentier, Victor Claes, Alexandre Vallée, Jean-Louis Hébert
In both colon cancer and type 2 diabetes, metabolic changes induced by upregulation of the Wnt/beta-catenin signaling and downregulation of peroxisome proliferator-activated receptor gamma (PPAR gamma) may help account for the frequent association of these two diseases. In both diseases, PPAR gamma is downregulated while the canonical Wnt/beta-catenin pathway is upregulated. In colon cancer, upregulation of the canonical Wnt system induces activation of pyruvate dehydrogenase kinase and deactivation of the pyruvate dehydrogenase complex...
2017: PPAR Research
https://www.readbyqxmd.com/read/28298487/tgf-%C3%AE-triggers-rapid-fibrillogenesis-via-a-novel-t%C3%AE-rii-dependent-fibronectin-trafficking-mechanism
#8
Archana Varadaraj, Laura M Jenkins, Priyanka Singh, Anindya Chanda, John Snider, N Y Lee, Ayelet R Amsalem-Zafran, Marcelo Ehrlich, Yoav I Henis, Karthikeyan Mythreye
Fibronectin (FN) is a critical regulator of extra cellular matrix (ECM) remodeling through its availability and stepwise polymerization for fibrillogenesis. Availability of FN is regulated by its synthesis and turnover, while fibrillogenesis is a multistep integrin dependent process essential for cell migration, proliferation and tissue function. Transforming growth factor beta (TGF-β) is an established regulator of ECM remodeling through transcriptional control of ECM proteins. Here, we show that TGF-β, through increased FN trafficking in a transcription and SMAD independent manner, is a direct and rapid inducer of fibrillogenesis required for TGF-β induced cell migration...
March 15, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28290551/epithelial-lt%C3%AE-r-signaling-controls-the-population-size-of-the-progenitors-of-medullary-thymic-epithelial-cells-in-neonatal-mice
#9
Weiwei Wu, Yaoyao Shi, Huan Xia, Qian Chai, Caiwei Jin, Boyang Ren, Mingzhao Zhu
The establishment of T cell central tolerance critically relies on the development and maintenance of the medullary thymic epithelial cells (mTECs). Disrupted signaling of lymphotoxin beta receptor (LTβR) results in dramatically reduced mTEC population. However, whether LTβR directly or indirectly control mTECs remains undetermined; how LTβR controls this process also remain unclear. In this study, by utilizing K14-Cre × Ltbr(fl/fl) conditional knockout (cKO) mice, we show that epithelial intrinsic LTβR was essential for the mTEC development postnatally...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28288328/case-control-exploratory-study-of-cerebrospinal-fluid-chemokines-cytokines-and-lymphocyte-subsets-in-childhood-tourette-syndrome-with-positive-streptococcal-markers
#10
Michael R Pranzatelli, Elizabeth D Tate, Tyler J Allison
A longstanding question is whether neuroinflammation is present in children symptomatic for Tourette syndrome (TS) with positive streptococcal serology and throat cultures. The objective was to directly test for it using modern hypothesis-driven approaches. Profiling studies for 14 immune cell types (flow cytometry), 7 chemokines/cytokines (ELISA), oligoclonal bands, and other immunoglobulins were performed in this IRB-approved study of 5 children with TS and streptococcal markers compared to data from 26 non-inflammatory pediatric neurological controls...
March 10, 2017: Cytokine
https://www.readbyqxmd.com/read/28284697/mir-27a-controls-triacylglycerol-synthesis-in-bovine-mammary-epithelial-cells-by-targeting-peroxisome-proliferator-activated-receptor-gamma
#11
K Q Tang, Y N Wang, L S Zan, W C Yang
Growing evidence has revealed that microRNA are central elements in milk fat synthesis in mammary epithelial cells. A negative regulator of adipocyte fat synthesis, miR-27a has been reported to be involved in the regulation of milk fat synthesis in goat mammary epithelial cells; however, the regulatory role of miR-27a in bovine milk fat synthesis remains unclear. In the present study, primary bovine mammary epithelial cells (BMEC) were harvested from mid-lactation cows and cultured in Dulbecco's modified Eagle's medium/F-12 medium with 10% fetal bovine serum, 5 μg/mL of insulin, 1 μg/mL of hydrocortisone, 2 μg/mL of prolactin, 1 μg/mL of progesterone, 100 U/mL of penicillin, and 100 μg/mL of streptomycin...
March 8, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28283822/antiproliferative-activity-of-vitexin-2-o-xyloside-and-avenanthramides-on-caco-2-and-hepg2-cancer-cells-occurs-through-apoptosis-induction-and-reduction-of-pro-survival-mechanisms
#12
Emanuele Salvatore Scarpa, Elena Antonini, Francesco Palma, Michele Mari, Paolino Ninfali
PURPOSE: CaCo-2 colon cancer cells and HepG2 liver cancer cells represent two malignant cell lines, which show a high resistance to apoptosis induced by the conventional anticancer drugs. Vitexin-2-O-xyloside (XVX) and avenanthramides (AVNs) are naturally occurring dietary agents from Beta vulgaris var. cicla L. and Avena sativa L., respectively. The aim of this work was to evaluate the antiproliferative effects and the reduction of the pro-survival mechanisms exerted by XVX and AVNs, used individually and in combination, in CaCo-2 and HepG2 cancer cells...
March 10, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28283550/the-effects-of-%C3%AE-adrenergic-receptor-drugs-on-embryonic-ventricular-cell-proliferation-and-differentiation-and-their-impact-on-donor-cell-transplantation
#13
Tiam Feridooni, Adam Hotchkiss, Mark Baguma-Nibasheka, Feixiong Zhang, Brittney Allen, Sarita Chinni, Kishore B S Pasumarthi
The beta-adrenergic receptors (β-ARs) and catecholamines are present in rodents as early as embryonic day 10.5 (E10.5). However, it is not known whether β-AR signaling plays any role in proliferation and differentiation of ventricular cells in the embryonic heart. Here, we characterized the expression profiles of β-AR subtypes and established dose response curves for a nonselective β-AR agonist isoproterenol (ISO) in the developing mouse ventricular cells. Further, we investigated the effects of ISO on cell cycle activity and differentiation of cultured E11...
March 10, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28283432/gentamicin-loaded-thermosetting-hydrogel-and-moldable-composite-scaffold-formulation-study-and-biologic-evaluation
#14
Rossella Dorati, Antonella De Trizio, Ida Genta, Alessia Merelli, Tiziana Modena, Bice Conti
The aim was to design biodegradable drug delivery systems for gentamicin local delivery, meanwhile acting as scaffold for bone regeneration. Gentamicin loaded thermosetting composite hydrogels (TCHG) were prepared combining chitosan with bovine bone substitutes (BBS Orthoss® granules), beta-glycerophosphate as crosslinker, and lyophilized to obtain composite moldable scaffolds (mCSG). Diverse techniques for gentamicin loading into mCS were investigated by drug incorporation during hydrogel preparation, or drug absorption on preformed mCS...
March 7, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28283396/biochemical-relationships-between-bone-turnover-markers-and-blood-glucose-in-patients-with-type-2-diabetes-mellitus
#15
Rasha M Hussein
INTRODUCTION: Patients with type 2 diabetes mellitus develop many complications including osteopenia, which is associated with high fracture risk. Osteocalcin is a non collagenous protein derived from the osteoblasts. Recently, it was found that osteocalcin enhances the pancreatic beta cell proliferation, insulin secretion and protection against type 2 diabetes. OBJECTIVE: Investigation of the association of serum osteocalcin and other bone turnover markers with blood glucose level and diabetes mellitus duration in type 2 diabetic patients...
March 6, 2017: Diabetes & Metabolic Syndrome
https://www.readbyqxmd.com/read/28280900/paracrine-gaba-and-insulin-regulate-pancreatic-alpha-cell-proliferation-in-a-mouse-model-of-type-1-diabetes
#16
Allen L Feng, Yun-Yan Xiang, Le Gui, Gesthika Kaltsidis, Qingping Feng, Wei-Yang Lu
AIMS/HYPOTHESIS: This study aimed to elucidate the mechanism of increased proliferation of alpha cells in recent-onset type 1 diabetes. Pancreatic beta cells express GAD and produce γ-aminobutyric acid (GABA), which inhibits alpha cell secretion of glucagon. We explored the roles of GABA in alpha cell proliferation in conditions corresponding to type 1 diabetes in a mouse model and in vitro. METHODS: Type 1 diabetes was induced by injecting the mice with streptozotocin (STZ)...
March 9, 2017: Diabetologia
https://www.readbyqxmd.com/read/28280523/resveratrol-attenuates-copper-induced-senescence-by-improving-cellular-proteostasis
#17
Liliana Matos, Alexandra Monteiro Gouveia, Henrique Almeida
Copper sulfate-induced premature senescence (CuSO4-SIPS) consistently mimetized molecular mechanisms of replicative senescence, particularly at the endoplasmic reticulum proteostasis level. In fact, disruption of protein homeostasis has been associated to age-related cell/tissue dysfunction and human disorders susceptibility. Resveratrol is a polyphenolic compound with proved antiaging properties under particular conditions. In this setting, we aimed to evaluate resveratrol ability to attenuate cellular senescence induction and to unravel related molecular mechanisms...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28276713/aberrant-function-of-myeloid-derived-suppressor-cells-mdscs-in-experimental-colitis-and-in-inflammatory-bowel-disease-ibd-immune-responses
#18
Eleni Kontaki, Dimitrios T Boumpas, Maria Tzardi, Ioannis A Mouzas, Konstantinos A Papadakis, Panayotis Verginis
BACKGROUND AND AIMS: Myeloid-derived suppressor cells (MDSCs) encompass a novel population of suppressor cells and a potential candidate for cell-based therapies in inflammatory diseases. Herein, we investigated their immunomodulatory properties in experimental inflammatory colitis and T cell-mediated immune responses in inflammatory bowel disease (IBD) patients. METHODS: MDSCs (defined as CD14(-)HLA(-)DR(-/low)CD33(+)CD15(+)) numbers were determined in peripheral blood (PB) from IBD patients...
March 3, 2017: Autoimmunity
https://www.readbyqxmd.com/read/28273461/integrin-beta-3-regulates-cellular-senescence-by-activating-the-tgf-%C3%AE-pathway
#19
Valentina Rapisarda, Michela Borghesan, Veronica Miguela, Vesela Encheva, Ambrosius P Snijders, Amaia Lujambio, Ana O'Loghlen
Cellular senescence is an important in vivo mechanism that prevents the propagation of damaged cells. However, the precise mechanisms regulating senescence are not well characterized. Here, we find that ITGB3 (integrin beta 3 or β3) is regulated by the Polycomb protein CBX7. β3 expression accelerates the onset of senescence in human primary fibroblasts by activating the transforming growth factor β (TGF-β) pathway in a cell-autonomous and non-cell-autonomous manner. β3 levels are dynamically increased during oncogene-induced senescence (OIS) through CBX7 Polycomb regulation, and downregulation of β3 levels overrides OIS and therapy-induced senescence (TIS), independently of its ligand-binding activity...
March 7, 2017: Cell Reports
https://www.readbyqxmd.com/read/28271032/bezafibrate-ameliorates-diabetes-via-reduced-steatosis-and-improved-hepatic-insulin-sensitivity-in-diabetic-tallyho-mice
#20
Andras Franko, Susanne Neschen, Jan Rozman, Birgit Rathkolb, Michaela Aichler, Annette Feuchtinger, Laura Brachthäuser, Frauke Neff, Marketa Kovarova, Eckhard Wolf, Helmut Fuchs, Hans-Ulrich Häring, Andreas Peter, Martin Hrabě de Angelis
OBJECTIVE: Recently, we have shown that Bezafibrate (BEZ), the pan-PPAR (peroxisome proliferator-activated receptor) activator, ameliorated diabetes in insulin deficient streptozotocin treated diabetic mice. In order to study whether BEZ can also improve glucose metabolism in a mouse model for fatty liver and type 2 diabetes, the drug was applied to TallyHo mice. METHODS: TallyHo mice were divided into an early (ED) and late (LD) diabetes progression group and both groups were treated with 0...
March 2017: Molecular Metabolism
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