keyword
MENU ▼
Read by QxMD icon Read
search

Exendin-4

keyword
https://www.readbyqxmd.com/read/27917297/an-intrinsic-agonist-mechanism-for-activation-of-glucagon-like-peptide-1-receptor-by-its-extracellular-domain
#1
Yanting Yin, X Edward Zhou, Li Hou, Li-Hua Zhao, Bo Liu, Gaihong Wang, Yi Jiang, Karsten Melcher, H Eric Xu
The glucagon-like peptide-1 receptor is a class B G protein coupled receptor (GPCR) that plays key roles in glucose metabolism and is a major therapeutic target for diabetes. The classic two-domain model for class B GPCR activation proposes that the apo-state receptor is auto-inhibited by its extracellular domain, which physically interacts with the transmembrane domain. The binding of the C-terminus of the peptide hormone to the extracellular domain allows the N-terminus of the hormone to insert into the transmembrane domain to induce receptor activation...
2016: Cell Discovery
https://www.readbyqxmd.com/read/27915415/exendin-4-protects-huvecs-from-tunicamycin-induced-apoptosis-via-inhibiting-the-ire1a-jnk-caspase-3-pathway
#2
Li Wu, XiaoYing Liu, LinXi Wang, YanPing Wang, LiJing Wang, BinBin Guan, Zhou Chen, LiBin Liu
PURPOSE: The abnormal increase of apoptosis of endothelial cells induced by endoplasmic reticulum stress is a significant factor for vascular disease, especially for atherosclerosis. Protecting endothelial cells from endoplasmic reticulum stress is a crucial strategies to combate these diseases. The goal of this study was to explore the effect of Exendin-4, a glucagon-like peptide-1 receptor agonist, on tunicamycin-induced apoptosis in human umbilical vein endothelial cells. METHODS: All studies were performed in primary human umbilical vein endothelial cells treated with tunicamycin with or without Exendin-4 pretreatment...
December 3, 2016: Endocrine
https://www.readbyqxmd.com/read/27913661/effects-of-exendin-4-on-the-intrarenal-renin-angiotensin-system-and-interstitial-fibrosis-in-unilateral-ureteral-obstruction-mice-exendin-4-and-unilateral-ureteral-obstruction
#3
Ying Le, Zongji Zheng, Junyu Xue, Mengling Cheng, Meiping Guan, Yaoming Xue
OBJECTIVE: The objective of this article is to investigate the renoprotecive effects of exendin-4 in a mouse model of unilateral ureteral obstruction (UUO) and explore the putative mechanisms. METHODS: Male Balbc mice underwent sham operation or UUO surgery, and then received intraperitoneal injection of vehicle or exendin-4, respectively. After 14 days, mice were sacrificed and the left kidneys were collected and analyzed by histology, immunohistochemistry, Western blot, quantitative real-time reverse transcription polymerase chain reaction, radioimmunoassay and enzyme-linked immunosorbent assay...
October 2016: Journal of the Renin-angiotensin-aldosterone System: JRAAS
https://www.readbyqxmd.com/read/27908915/-the-hypothalamic-glucagon-like-peptide-1-glp-1-receptor-glp-1r-is-sufficient-but-not-necessary-for-the-regulation-of-energy-balance-and-glucose-homeostasis-in-mice
#4
Melissa A Burmeister, Jennifer E Ayala, Hannah Smouse, Adriana Landivar-Rocha, Jacob D Brown, Daniel J Drucker, Doris A Stoffers, Darleen A Sandoval, Randy J Seeley, Julio E Ayala
Pharmacological activation of the hypothalamic glucagon-like peptide-1 (GLP-1) receptor (GLP-1R) promotes weight loss and improves glucose tolerance. This demonstrates that the hypothalamic GLP-1R is sufficient but does not show whether it is necessary for the effects of exogenous GLP-1R agonists (GLP-1RA) or endogenous GLP-1 on these parameters. To address this, we crossed mice harboring floxed Glp1r alleles to mice expressing Nkx2.1-Cre to knock down Glp1r expression throughout the hypothalamus (GLP-1RKD(ΔNkx2...
December 1, 2016: Diabetes
https://www.readbyqxmd.com/read/27907035/exendin-4-inhibits-hepatic-lipogenesis-by-increasing-%C3%AE-catenin-signaling
#5
Mi Hae Seo, Jinmi Lee, Seok-Woo Hong, Eun-Jung Rhee, Se Eun Park, Cheol Young Park, Ki Won Oh, Sung Woo Park, Won-Young Lee
The aim of this study is to investigate whether the beneficial effect of exendin-4 on hepatic steatosis is mediated by β-catenin signaling. After the HepG2 human hepatoma cells were treated with PA for 24 hours, total triglycerides levels were increased in a dose-dependent manner, and the expression levels of perilipin family members were upregulated in cells treated with 400 μM PA. For our in vitro model of hepatic steatosis, HepG2 cells were treated with 400 μM palmitic acid (PA) in the presence or absence of 100 nM exendin-4 for 24 hours...
2016: PloS One
https://www.readbyqxmd.com/read/27898108/monotreme-glucagon-like-peptide-1-in-venom-and-gut-one-gene-two-very-different-functions
#6
Enkhjargal Tsend-Ayush, Chuan He, Mark A Myers, Sof Andrikopoulos, Nicole Wong, Patrick M Sexton, Denise Wootten, Briony E Forbes, Frank Grutzner
The importance of Glucagon like peptide 1 (GLP-1) for metabolic control and insulin release sparked the evolution of genes mimicking GLP-1 action in venomous species (e.g. Exendin-4 in Heloderma suspectum (gila monster)). We discovered that platypus and echidna express a single GLP-1 peptide in both intestine and venom. Specific changes in GLP-1 of monotreme mammals result in resistance to DPP-4 cleavage which is also observed in the GLP-1 like Exendin-4 expressed in Heloderma venom. Remarkably we discovered that monotremes evolved an alternative mechanism to degrade GLP-1...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27895384/exendin-4-induces-extracellular-superoxide-dismutase-through-histone-h3-acetylation-in-human-retinal-endothelial-cells
#7
Hiroyuki Yasuda, Atsuko Ohashi, Shohei Nishida, Tetsuro Kamiya, Tetsuya Suwa, Hirokazu Hara, Jun Takeda, Yoshinori Itoh, Tetsuo Adachi
Extracellular-superoxide dismutase (genetic name SOD3) is a secreted anti-oxidative enzyme, and its presence in vascular walls may play an important role in protecting the vascular system against oxidative stress. Oxidative stress has been implicated in the pathogenesis of diabetic retinopathy; therefore, increases in extracellular-superoxide dismutase have been suggested to inhibit the progression of diabetic retinopathy. Incretin-based drugs such as glucagon-like peptide-1 receptor agonists are used in the treatment of type 2 diabetes...
November 2016: Journal of Clinical Biochemistry and Nutrition
https://www.readbyqxmd.com/read/27888738/oxyntomodulin-analog-and-exendin-4-derivative-lower-plasma-glucose-in-cattle
#8
S ThanThan, Y Asada, T Saito, K Ochiiwa, H Zhao, S W Naing, H Kuwayama
The present study was undertaken with the aim of examining whether and how exendin-4 (1-3) fragment, ie, Ex-4 (1-3) fragment, contributes to the regulation of glucose. An analog of oxyntomodulin (OXM) ([Gly(2), Glu(3)]-OXM), a glucagon analog ([Gly(2), Glu(3)]-glucagon), and two derivatives of Ex-4 (glucandin and [Gly(2), Glu(3)]-glucandin) were synthesized by substituting with Gly(2), Glu(3) at the N-terminuses of OXM and glucagon and/or by attaching Ex-4 (30-39) amide at the C-terminus of glucagon. Effects of these peptides on plasma insulin and glucose concentrations were investigated in cattle by conducting 3 in vivo experiments...
November 2, 2016: Domestic Animal Endocrinology
https://www.readbyqxmd.com/read/27882092/the-influence-of-exendin-4-intervention-on-obese-diabetic-mouse-blood-and-the-pancreatic-tissue-immune-microenvironment
#9
Jinshui He, Chaowei Lian, Yanling Fang, Jinzhi Wu, Huowang Zhou, Xiaoling Ye
The aim of the study was to determine the influence of exendin-4 intervention on non-obese diabetic (NOD) mouse blood and the pancreatic tissue immune microenvironment. A total of 40 clean NOD mice were used in the study and randomly divided into 4 groups (n=10/group). The first group was blank control group D with normal saline intervention, and with different doses of exendin, i.e.,-4 2, 4 and 8 µg/kg/day. The three remaining groups were: i) Low-dose group A; ii) medium-dose group B; and iii) high-dose group C...
November 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/27882091/exendin-4-antagonizes-a%C3%AE-1-42-induced-attenuation-of-spatial-learning-and-memory-ability
#10
Xiaohui Wang, Li Wang, Ruirui Jiang, Yunyun Xu, Xueling Zhao, Yang Li
β-amyloid protein (Aβ) accumulation in cerebral centers involved in cognition and memory is a pivotal pathological feature of Alzheimer's disease (AD). The onset process of type 2 diabetes mellitus (T2DM) has a number of similarities compared with AD. Thus, it is hypothesized that the pharmacological therapy employed for the treatment of T2DM may help to prevent and ameliorate the symptoms of AD. This study demonstrated that Exendin-4, which is a glucagon-like peptide-1 analogue which is used as a therapeutic drug for T2DM, markedly antagonized Aβ fragment-induced attenuation of spatial learning and memory ability, as indicated by a Morris water maze experiment...
November 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/27878229/glucagon-like-peptide-1-improves-insulin-resistance-in-vitro-through-anti-inflammation-of-macrophages
#11
C Guo, T Huang, A Chen, X Chen, L Wang, F Shen, X Gu
Glucagon-like peptide 1 (GLP-1), a kind of gut hormone, is used in the treatment of type 2 diabetes (T2D). Emerging evidence indicates that GLP-1 has anti-inflammatory activity. Chronic inflammation in the adipose tissue of obese individuals is a cause of insulin resistance and T2D. We hypothesized that GLP-1 analogue therapy in patients with T2D could suppress the inflammatory response of macrophages, and therefore inhibit insulin resistance. Our results showed that GLP-1 agonist (exendin-4) not only attenuated macrophage infiltration, but also inhibited the macrophage secretion of inflammatory cytokines including TNF-β, IL-6, and IL-1β...
November 21, 2016: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/27872157/exendin-4-increases-oxygen-consumption-and-thermogenic-gene-expression-in-muscle-cells
#12
Jin-Seung Choung, Young-Sun Lee, Hee-Sook Jun
Glucagon-like peptide-1 (GLP1) has many anti-diabetic actions and also increases energy expenditure in vivo. Since skeletal muscle is a major organ controlling energy metabolism, we investigated whether GLP1 can affect energy metabolism in muscle. We found that treatment of differentiated C2C12 cells with Exendin-4 (Ex-4), a GLP1 receptor agonist, reduced oleate:palmitate-induced lipid accumulation and triglyceride content compared with cells without Ex-4 treatment. When we examined the oxygen consumption rate (OCR), not only the basal OCR but also the OCR induced by oleate:palmitate addition was significantly increased in Ex-4-treated differentiated C2C12 cells, and this was inhibited by Exendin-9, a GLP1 receptor antagonist...
November 21, 2016: Journal of Molecular Endocrinology
https://www.readbyqxmd.com/read/27831640/influence-and-significance-of-intervening-diabetes-microrna-expression-profile-of-nod-mice-with-exendin-4
#13
J-S He, C-W Lian, Y-L Fang, J-Z Wu, X-L Ye, S-B Zhu
OBJECTIVE: To provide selectable microRNA for intervening diabetes mellitus diseases, NOD mice's expression of microRNA in pancreas tissues and blood under the exendin-4 intervention of was observed and the difference of microRNA target gene was screened. MATERIALS AND METHODS: Forty clean NOD mice were randomly divided into four groups (in each group, n = 10): One is blank control group D which is intervened with normal saline, and the other three groups were divided into low-dose group A, middle-dose group B, and high-dose group C according to the different exendin-4 dosage 2, 4, and 8 μg/kg·d...
October 2016: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/27826714/exendin-4-promotes-pancreatic-%C3%AE-cell-proliferation-via-inhibiting-the-expression-of-wnt5a
#14
Xinger Wu, Weiwei Liang, Hongyu Guan, Juan Liu, Liehua Liu, Hai Li, Xiaoying He, Jing Zheng, Jie Chen, Xiaopei Cao, Yanbing Li
Exendin-4, a glucagon-like peptide-1 receptor agonist, is currently regarded as an effective therapeutic strategy for type-2 diabetes. Previous studies indicated that exendin-4 promoted β cell proliferation. However, the underlying mechanisms remain largely unknown. Recently it was reported that exendin-4 promoted pancreatic β cell proliferation by regulating the expression level of Wnt4. The present study was designed to investigate whether other Wnt isoforms take part in accommodation of β-cell proliferation...
November 9, 2016: Endocrine
https://www.readbyqxmd.com/read/27823935/glucose-enhances-rat-islet-function-via-stimulating-cart-expression
#15
Wan Xu, Yuqing Zhang, Mengyao Bai, Feiye Zhou, Ruyuan Deng, Xueying Ji, Juan Zhang, Yun Liu, Libin Zhou, Xiao Wang
Cocaine- and amphetamine-regulated transcript (CART) is an anorexigenic peptide widely expressed in the central and peripheral nervous systems, as well as in endocrine cells. CART is markedly upregulated in the β-cells of several rodent models of type-2 diabetes. The stimulatory effect of exogenous CART peptide on insulin secretion is cAMP dependent. Glucose is the most important regulator of islet function. However, the role of CART in glucose-potentiated insulin secretion remains unclear. Here, our results showed that glucose time- and dose-dependently elicited CART mRNA expression in rat islets...
December 2, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27819034/quantification-of-%C3%AE-cell-mass-in-intramuscular-islet-grafts-using-radiolabeled-exendin-4
#16
Daniel Espes, Ramkumar Selvaraju, Irina Velikyan, Martin Krajcovic, Per-Ola Carlsson, Olof Eriksson
BACKGROUND: There is an increasing interest in alternative implantation sites to the liver for islet transplantation. Intramuscular implantation has even been tested clinically. Possibilities to monitor β-cell mass would be of huge importance not only for the understanding of islet engraftment but also for the decision of changing the immunosuppressive regime. We have therefore evaluated the feasibility of quantifying intramuscular β-cell mass using the radiolabeled glucagon like peptide-1 receptor agonist DO3A-VS-Cys(40)-Exendin-4...
August 2016: Transplantation Direct
https://www.readbyqxmd.com/read/27797911/novel-monoclonal-antibody-is-an-allosteric-insulin-receptor-antagonist-that-induces-insulin-resistance
#17
Anne M Cieniewicz, Thomas Kirchner, Simon A Hinke, Rupesh Nanjunda, Katharine D'Aquino, Ken Boayke, Philip R Cooper, Robert Perkinson, Mark L Chiu, Dana L Johnson, Jean M Whaley, Eilyn R Lacy, Russell B Lingham, Yin Liang, Anthony J Kihm
A hallmark of type 2 diabetes is impaired insulin receptor signaling resulting in dysregulation of glucose homeostasis. Understanding the molecular origins and progression of diabetes and developing therapeutics are dependent on experimental models of hyperglycemia, hyperinsulinemia and insulin resistance. Here, we present a novel monoclonal antibody, IRAB-B, a specific, potent insulin receptor antagonist that creates rapid and long lasting insulin resistance. IRAB-B binds to the insulin receptor with nanomolar affinity, and in the presence of insulin, efficiently blocks receptor phosphorylation within minutes and is sustained for at least 3 days in vitro...
October 26, 2016: Diabetes
https://www.readbyqxmd.com/read/27784780/exendin-4-ameliorates-lipotoxicity-induced-glomerular-endothelial-cell-injury-by-improving-abc-transporter-a1-mediated-cholesterol-efflux-in-diabetic-apoe-knockout-mice
#18
Qing-Hua Yin, Rui Zhang, Li Li, Yi-Ting Wang, Jing-Ping Liu, Jie Zhang, Lin Bai, Jing-Qiu Cheng, Ping Fu, Fang Liu
The ATP-binding cassette transporter A1 (ABCA1), which promotes cholesterol efflux from cells and inhibits inflammatory responses, is highly expressed in the kidney. Research has shown that exendin-4, a glucagon-like peptide-1 receptor (GLP-1R) agonist, promotes ABCA1 expression in multiple tissues and organs; however, the mechanisms underlying exendin-4 induction of ABCA1 expression in glomerular endothelial cells are not fully understood. In this study we investigated the effect of exendin-4 on ABCA1 in glomerular endothelial cells of diabetic kidney disease (DKD) and the possible mechanism...
October 26, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27780892/diabetes-negatively-affects-cortical-and-striatal-gabaergic-neurons-an-effect-that-is-partially-counteracted-by-exendin-4
#19
Martin Larsson, Grazyna Lietzau, David Nathanson, Claes-Göran Östenson, Carina Mallard, Maria E Johansson, Thomas Nyström, Cesare Patrone, Vladimer Darsalia
Type 2 diabetic (T2D) patients often develop early cognitive and sensorimotor impairments. The pathophysiological mechanisms behind these problems are largely unknown. Recent studies demonstrate that dysfunctional γ-aminobutyric acid (GABAergic) neurons are involved in age-related cognitive decline. We hypothesized that similar, but earlier dysfunction is taking place under T2D in the neocortex and striatum (two brain areas important for cognition and sensorimotor functions). We also hypothesized that the T2D-induced effects are pharmacologically reversible by anti-diabetic drugs targeting the glucagon-like peptide-1 receptor (GLP-1R)...
December 2016: Bioscience Reports
https://www.readbyqxmd.com/read/27764251/heterologous-expression-and-delivery-of-biologically-active-exendin-4-by-lactobacillus-paracasei-l14
#20
Zhu Zeng, Rui Yu, Fanglei Zuo, Bo Zhang, Deju Peng, Huiqin Ma, Shangwu Chen
Exendin-4, a glucagon-like protein-1 (GLP-1) receptor agonist, is an excellent therapeutic peptide drug for type 2 diabetes due to longer lasting biological activity compared to GLP-1. This study explored the feasibility of using probiotic Lactobacillus paracasei as an oral vector for recombinant exendin-4 peptide delivery, an alternative to costly chemical synthesis and inconvenient administration by injection. L. paracasei transformed with a plasmid encoding the exendin-4 gene (L. paracasei L14/pMG76e-exendin-4) with a constitutive promotor was successfully constructed and showed efficient secretion of exendin-4...
2016: PloS One
keyword
keyword
73548
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"