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Apelin

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https://www.readbyqxmd.com/read/28091541/apelin-receptor-homodimer-oligomers-revealed-by-single-molecule-imaging-and-novel-g-protein-dependent-signaling
#1
Xin Cai, Bo Bai, Rumin Zhang, Chunmei Wang, Jing Chen
The apelin receptor (APJ) belongs to family A of the G protein-coupled receptors (GPCRs) and is a potential pharmacotherapeutic target for heart failure, hypertension, and other cardiovascular diseases. There is evidence APJ heterodimerizes with other GPCRs; however, the existence of APJ homodimers and oligomers remains to be investigated. Here, we measured APJ monomer-homodimer-oligomer interconversion by monitoring APJ dynamically on cells and compared their proportions, spatial arrangement, and mobility using total internal reflection fluorescence microscopy, resonance energy transfer, and proximity biotinylation...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28088732/apelin-13-protects-rat-primary-cortical-glia-neuron-co-culture-against-pentylenetetrazole-induced-toxicity
#2
Taj Pari Kalantaripour, Saeed Esmaeili-Mahani, Vahid Sheibani, Hamid Najafipour, Majid Asadi-Shekaari M
In spite of recent advances in the treatment of epilepsy, up to 35% of people living with the condition do not respond to accessible anti-epileptic drugs (AEDs) and continue to experience regular, devastating and potentially life-threatening seizures. Neuronal death is a significant feature of epilepsy in humans and experimental models. It has been reported that apelin, an endogenous ligand for the angiotensin-1-like receptor (APJ), has anticonvulsive as well as protective effects in some neurodegenerative situations...
January 12, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28087150/apelin-protects-against-nmda-induced-retinal-neuronal-death-via-an-apj-receptor-by-activating-akt-and-erk1-2-and-suppressing-tnf-%C3%AE-expression-in-mice
#3
Yuki Ishimaru, Akihide Sumino, Daiki Kajioka, Fumiya Shibagaki, Akiko Yamamuro, Yasuhiro Yoshioka, Sadaaki Maeda
Glutamate excitotoxicity mediated by N-methyl-d-aspartate (NMDA) receptors is an important cause of retinal ganglion cell death in glaucoma. To elucidate whether apelin protects against retinal neuronal cell death, we examined protective effects of exogenous and endogenous apelin on neuronal cell death induced by intravitreal injection of NMDA in the retinas of mice. An intravitreal injection of NMDA induced neuronal cell death in both the retinal ganglion cell layer and inner nuclear layer, and reduced the amplitudes of scotopic threshold response (STR) in electroretinography studies...
December 24, 2016: Journal of Pharmacological Sciences
https://www.readbyqxmd.com/read/28065733/amelioration-of-apelin-13-in-chronic-normobaric-hypoxia-induced-anxiety-like-behavior-is-associated-with-an-inhibition-of-nf-%C3%AE%C2%BAb-in-the-hippocampus
#4
Junming Fan, Lu Ding, Dongmei Xia, Danyang Chen, Pu Jiang, Wenhua Ge, Ru Zhao, Jinbin Guo, Xiaofang Fan, Feng Xue, Yongyu Wang, Sunzhong Mao, Lianggang Hu, Yongsheng Gong
Apelin, a small bioactive peptide, plays an important role in the pathogenesis of mood disorders through the endogenous ligand APJ. Although the anxiolytic effect of apelin is well established, the mechanisms are poorly understood. In this study, we hypothesized that apelin played an anxiolytic role in chronic normobaric hypoxia (CNH)-induced anxiety like behavior in mice, which might be associated with an inhibition of nuclear factor-κB (NF-κB) activation in the hippocampus. To this end, mice were exposed in a normobaric hypoxic chamber with a fraction of inspired oxygen (FIO2, ∼10%, 23h/d) with or without apelin-13 application (20 nmol...
January 5, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28051763/maternal-undernutrition-programs-the-apelinergic-system-of-adipose-tissue-in-adult-male-rat-offspring
#5
S Lecoutre, L Marousez, A Drougard, C Knauf, C Guinez, D Eberlé, C Laborie, D Vieau, J Lesage, C Breton
Based on the Developmental Origin of Health and Disease concept, maternal undernutrition has been shown to sensitize adult offspring to metabolic pathologies such as obesity. Using a model of maternal 70% food restriction in pregnant female rats throughout gestation (called FR30), we previously reported that obesity-prone adult male rat offspring displayed hyperleptinemia with modifications in leptin and leptin receptor messenger RNA (mRNA) levels in white adipose tissue (WAT). Apelin is a member of the adipokine family that regulates various aspects of energy metabolism and WAT functionality...
February 2017: Journal of Developmental Origins of Health and Disease
https://www.readbyqxmd.com/read/28039702/serum-apelin-levels-and-body-composition-changes-in-breast-cancer-patients-treated-with-an-aromatase-inhibitor
#6
Tarik Salman, Leyla Demir, Umut Varol, Murat Akyol, Utku Oflazoglu, Yasar Yildiz, Halil Taskaynatan, Hakan Cengiz, Guven Guvendi, Yuksel Kucukzeybek, Ahmet Alacacioglu, Oktay Tarhan
PURPOSE: The adipose tissue plays a role in carcinogenesis with the adipokines it generates. Apelin is an anti-obesigenic adipokine, and assumes roles in both vascularization and tumor cell proliferation. The present study aimed to investigate changes in apelin levels, in postmenopausal breast cancer (BC) patients receiving aromatase inhibitors (AIs). METHODS: Forty early-stage postmenopausal BC patients treated with AIs with no history of chemotherapy administration were included in the study...
November 2016: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/28025030/apelin-apj-system-a-novel-promising-therapy-target-for-pathological-angiogenesis
#7
REVIEW
Lele Wu, Linxi Chen, Lanfang Li
Apelin is the endogenous ligand of the G protein-coupled receptor APJ. Both Apelin and APJ receptor are widely distributed in various tissues such as heart, brain, limbs, retina and liver. Recent research indicates that the Apelin/APJ system plays an important role in pathological angiogenesis which is a progress of new blood branches developing from preexisting vessels via sprouting. In this paper, we review the important role of the Apelin/APJ system in pathological angiogenesis. The Apelin/APJ system promotes angiogenesis in myocardial infarction, ischemic stroke, critical limb ischemia, tumor, retinal angiogenesis diseases, cirrhosis, obesity, diabetes and other related diseases...
December 23, 2016: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/28017911/apelin-concentrations-are-associated-with-altered-atherosclerotic-plaque-stability-mediator-levels-and-atherosclerosis-in-rheumatoid-arthritis
#8
Sule Gunter, Ahmed Solomon, Linda Tsang, Angela J Woodiwiss, Chanel Robinson, Aletta M E Millen, Gavin R Norton, Patrick H Dessein
BACKGROUND AND AIMS: Apelin-APJ signaling reduces cardiovascular disease (CVD) risk. In rheumatoid arthritis (RA), the atherosclerosis burden and plaque vulnerability to rupture are increased. We explored relationships between apelin concentrations and subclinical CVD in RA. METHODS: Apelin levels were measured in 235 (114 black, 121 white) RA patients. Associations between apelin concentrations and ultrasound determined carotid artery intima-media thickness (cIMT) and plaque, and levels of matrix metalloproteinase (MMP)-2 and -9 that mediate plaque stability and vulnerability respectively, were identified in confounder adjusted multivariate regression analysis...
November 24, 2016: Atherosclerosis
https://www.readbyqxmd.com/read/28013452/plasma-apelin-and-asymmetric-dimethylarginine-adma-levels-shortly-after-laparoscopic-greater-curvature-plication
#9
Elias Khajeh, Nekoo Panahi, Atefeh Golpaie, Sepideh Hosseini Shirvani, Mohsen Afarideh, Omid Ghamarnejad, Mohammad Talebpour, Mohammad Javad Hosseinzadeh-Attar
OBJECTIVES: We sought to investigate the short-term effect of weight loss following restrictive bariatric surgery on plasma concentrations of apelin and asymmetric dimethylarginine (ADMA) in individuals with morbid obesity. SUBJECTS/METHODS: Thirty-seven morbidly obese individuals underwent laparoscopic greater curvature plication (LGCP). Anthropometric indices and plasma concentrations high-sensitivity C-reactive protein (hsCRP), apelin, and ADMA were measured before and 6 weeks after LGCP...
December 24, 2016: Obesity Surgery
https://www.readbyqxmd.com/read/28012561/peripheral-apelin-13-administration-inhibits-gastrointestinal-motor-functions-in-rats-the-role-of-cholecystokinin-through-cck1-receptor-mediated-pathway
#10
Mehmet Bülbül, Osman Sinen, İlknur Birsen, V Nimet İzgüt-Uysal
Apelin is the endogenous ligand of the G protein-coupled receptor APJ. The APJ receptor is widely expressed in gastrointestinal (GI) tissues including stomach and small intestine. Apelin administration was shown to induce the release of cholecystokinin (CCK) which is a well-known alimentary hormone with its inhibitory actions on GI motor functions through CCK1 receptors on vagal afferent fibers. We investigated whether; (i) peripherally injected apelin-13 alters GI motor functions, (ii) apelin-induced changes are mediated by APJ receptor or CCK1 receptor and (iii) vagal afferents are involved in inhibitory effects of apelin...
December 16, 2016: Neuropeptides
https://www.readbyqxmd.com/read/28011947/effects-of-time-of-day-and-the-wingate-test-on-appetite-perceptions-food-intake-and-plasma-levels-of-adipokines
#11
J Bilski, J Jaworek, J Pokorski, J Nitecki, E Nitecka, J Pokorska, A Mazur-Bialy, J Szklarczyk
It has been demonstrated that several aspects of adipose-related physiology including adipokine release, exhibit daily oscillations. Physical exercise exerts a strong influence on adipokine release and a possible reverse disruption of peripheral circadian clocks. The aim of this study was to establish the effects of time of day and the Wingate test on appetite perception, food intake and plasma levels of adipokines. Twenty-four moderately active non-smoking males (mean ± S.D. age: 27.1 ± 3.1 years; height: 1...
October 2016: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28009234/combined-gene-therapy-with-vascular-endothelial-growth-factor-plus-apelin-in-a-chronic-cerebral-hypoperfusion-model-in-rats
#12
Masafumi Hiramatsu, Tomohito Hishikawa, Koji Tokunaga, Hiroyasu Kidoya, Shingo Nishihiro, Jun Haruma, Tomohisa Shimizu, Yuji Takasugi, Yukei Shinji, Kenji Sugiu, Nobuyuki Takakura, Isao Date
OBJECTIVE The aim of this study was to evaluate whether combined gene therapy with vascular endothelial growth factor (VEGF) plus apelin during indirect vasoreconstructive surgery enhances brain angiogenesis in a chronic cerebral hypoperfusion model in rats. METHODS A chronic cerebral hypoperfusion model induced by the permanent ligation of bilateral common carotid arteries (CCAs; a procedure herein referred to as "CCA occlusion" [CCAO]) in rats was employed in this study. Seven days after the CCAO procedure, the authors performed encephalo-myo-synangiosis (EMS) and injected plasmid(s) into each rat's temporal muscle...
December 23, 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28005927/antiproliferative-and-pro-apoptotic-effects-of-mir-4286-inhibition-in-melanoma-cells
#13
Anna Komina, Nadezhda Palkina, Mariya Aksenenko, Seseg Tsyrenzhapova, Tatiana Ruksha
INTRODUCTION: MicroRNAs are essential regulators of gene expression at the post-transcriptional level. Their expression is altered in cancer tissues, and evaluation of these alterations is considered a promising tool used to diagnose and identify prognostic markers. MATERIALS AND METHODS: The microRNA expression profiles of formalin-fixed, paraffin-embedded melanoma and melanocytic nevi samples were estimated with a microarray and subsequently validated by real-time PCR...
2016: PloS One
https://www.readbyqxmd.com/read/27994053/apelin-36-modulates-blood-glucose-and-body-weight-independently-of-canonical-apj-signaling
#14
Hadas Galon-Tilleman, Hong Yang, Maria A Bednarek, Sandra M Spurlock, Kevin J Paavola, Brian Ko, Carmen To, Jian Luo, Hui Tian, Lutz Jermutus, Joseph Grimsby, Cristina M Rondinone, Anish Konkar, Daniel D Kaplan
Apelin-36 was discovered as the endogenous ligand for the previously orphan receptor APJ. Apelin-36 has been linked to two major biological activities - cardiovascular (stimulation of cardiac contractility and suppression of blood pressure) and metabolic (improving glucose homeostasis and lowering body weight). It has been assumed that both of these activities are modulated through APJ. Here, we demonstrate that the metabolic activity of apelin-36 can be separated from canonical APJ activation. We developed a series of apelin-36 variants in which evolutionarily conserved residues were mutated, and evaluated their ability to modulate glucose homeostasis and body weight in chronic mouse models...
December 19, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27979574/apelin-apj-system-a-bifunctional-target-for-cardiac-hypertrophy
#15
REVIEW
Liqun Lu, Di Wu, Lanfang Li, Linxi Chen
Apelin acts as the endogenous ligand of G protein coupled receptors APJ. The apelin/APJ system is responsible for the occurrence and development of cardiovascular diseases. In recent years, apelin/APJ has been considered to play an important role in cardiac hypertrophy, but whether that role is beneficial or aggravating remains controversial. Apelin/APJ alleviates cardiac hypertrophy which is triggered by angiotensin II, oxidative stress and exercise. However, central administration of apelin induces cardiac hypertrophy...
November 9, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27966329/effect-of-resveratrol-on-resistin-and-apelin-gene-expressions-in-adipose-tissue-of-diabetic-rats
#16
Sadegh Zarei, Massoud Saidijam, Jamshid Karimi, Reza Yadegarazari, Azam Rezaei Farimani, Soulmaz-Sadat Hosseini-Zijoud, Mohammad Taghi Goodarzi
BACKGROUND/AIM: Adipose tissue plays a major role in glucose homeostasis. Dietary antioxidants such as resveratrol (RSV) may offer some protection against the early stage of diabetes mellitus and the development of complications. The present study investigated the effects of RSV on biochemical parameters and resistin and apelin gene expressions in adipose tissue of rats with type 2 diabetes. MATERIALS AND METHODS: Diabetes was induced using a single dose of streptozotocin + nicotinamide...
November 17, 2016: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/27966297/the-role-of-apelin-in-the-assessment-of-response-to-chemotherapyand-prognosis-in-stage-4-nonsmall-cell-lung-cancer
#17
Sinem Ermin, Gürsel Çok, Ali Veral, Timur Köse
BACKGROUND/AIM: Prediction of response to chemotherapy and prognosis bears clinical significance in patients with lung cancer. The aim of the study was to examine the association between apelin expression in tumor tissues and overall survival, progression-free survival, chemoresistance, and treatment response in stage 4 nonsmall cell lung cancer (NSCLC) patients undergoing chemotherapy. MATERIALS AND METHODS: A total of 81 patients who received chemotherapy due to a biopsy-documented diagnosis of NSCLC between 2004 and 2011 were retrospectively studied...
November 17, 2016: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/27924341/structure-activity-relationship-of-novel-macrocyclic-biased-apelin-receptor-agonists
#18
Alexandre Murza, Xavier Sainsily, Jérôme Côté, Laurent Bruneau-Cossette, Élie Besserer-Offroy, Jean-Michel Longpré, Richard Leduc, Robert Dumaine, Olivier Lesur, Mannix Auger-Messier, Philippe Sarret, Éric Marsault
Apelin is the endogenous ligand for the G protein-coupled receptor APJ and exerts a key role in regulating cardiovascular functions. We report herein a novel series of macrocyclic analogues of apelin-13 in which the N- and C-terminal residues as well as the macrocycle composition were chemically modified to modulate structure-activity relationships on the APJ receptor. To this end, the binding affinity and the ability to engage G protein-dependent and G protein-independent signalling pathways of the resulting analogues were assessed...
December 7, 2016: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/27916097/-effects-of-pyr-1-apelin-13-on-the-proliferation-and-activation-of-jarkat-t-lymphocyte
#19
Ming Wei, Lu Gan, Jin Hou, Lihong Chen, Yantong Liu, Ligang Ren
Objective To investigate the effect of (Pyr(1))apelin-13 on the proliferation and activation of Jurkat T lymphocytes. Methods Jurkat T cells were treated by 0, 10, 50 nmol/L (Pyr(1))apelin-13 for 24 hours and cell proliferation ability was detected by CCK-8 assay. The effect of (Pyr(1))apelin-13 on the activation of Jurkat T lymphocytes with anti-CD3 and anti-CD28 antibodies was observed and the molecular mechanism was investigated. Quantitative real-time PCR was applied to detect the expressions of CD69, CD25, cytotoxic T lymphocyte antigen-4 (CTLA-4) and programmed death-1 (PD-1) mRNAs...
December 2016: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
https://www.readbyqxmd.com/read/27903222/sustained-elabela-gene-therapy-in-high-salt-induced-hypertensive-rats
#20
Claire A Schreiber, Sara J Holditch, Alex Generous, Yasuhiro Ikeda
BACKGROUND: Elabela (ELA) is a recently identified apelin receptor agonist essential for cardiac development, but its biology and therapeutic potential are unclear. In humans ELA transcripts are detected in embryonic stem cells, induced pluripotent stem cells, kidney, heart and blood vessels. ELA through the apelin receptor promotes angiogenesis in vitro, relaxes murine aortic blood vessels and attenuates high blood pressure in vivo. The apelin receptor when bound to its original ligand, apelin, exerts peripheral vasodilatory and positive inotropic effects, conferring cardioprotection in vivo...
November 21, 2016: Current Gene Therapy
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