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Advanced glycation endproducts

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https://www.readbyqxmd.com/read/28088659/altered-cerebral-insulin-response-in-transgenic-mice-expressing-the-epsilon-4-allele-of-the-human-apolipoprotein-e-gene
#1
Marie-Thérèse Traversy, Milène Vandal, Cyntia Tremblay, Marine Tournissac, Ariane Giguère-Rancourt, A David Bennett, Frédéric Calon
Apolipoprotein E epsilon-4 (APOEε4 or APOE4), an allelic variation of the APOE gene, not only increases the risk of developing the late-onset form of Alzheimer's disease (AD), but also influences the outcome of treatment. Indeed, data from clinical studies show that the beneficial effect of insulin on cognition is blunted in APOE4 carriers. To investigate how APOE impacts insulin response, we assessed the effects of an acute insulin injection in APOE3- and APOE4-targeted replacement mice that respectively express the human APOE3 or APOE4 isoform instead of the endogenous murine ApoE protein...
November 30, 2016: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28088642/anti-rage-antibody-selectively-blocks-acute-systemic-inflammatory-responses-to-lps-in-serum-liver-csf-and-striatum
#2
Juciano Gasparotto, Camila Tiefensee Ribeiro, Rafael Calixto Bortolin, Henrique Schaan Fernandes, Alexsander Alves Teixeira, Marcelo Otavio Rodrigues Guasselli, Crepin Aziz Jose O Agani, Natália Cabral Souza, Mateus Grings, Guilhian Leipnitz, Henrique Mautone Gomes, Matheus Augusto de Bittencourt Pasquali, Peter R Dunkley, Phillip W Dickson, José Claudio Fonseca Moreira, Daniel Pens Gelain
Systemic inflammation induces transient or permanent dysfunction in the brain by exposing it to soluble inflammatory mediators. The receptor for advanced glycation endproducts (RAGE) binds to distinct ligands mediating and increasing inflammatory processes. In this study we used an LPS-induced systemic inflammation model in rats to investigate the effect of blocking RAGE in serum, liver, cerebrospinal fluid (CSF) and brain (striatum, prefrontal cortex, ventral tegmental area and substantia nigra). Intraperitoneal injection of RAGE antibody (50 μg/kg) was followed after 1h by a single LPS (5 mg/kg) intraperitoneal injection...
January 11, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28069685/associations-of-body-mass-index-with-laboratory-and-biomarkers-in-patients-with-acute-heart-failure
#3
Koen W Streng, Jozine M Ter Maaten, John G Cleland, Christopher M O'Connor, Beth A Davison, Marco Metra, Michael M Givertz, John R Teerlink, Piotr Ponikowski, Daniel M Bloomfield, Howard C Dittrich, Hans L Hillege, Dirk J van Veldhuisen, Adriaan A Voors, Peter van der Meer
BACKGROUND: Plasma concentrations of natriuretic peptides decline with obesity in patients with heart failure. Whether this is true for other biomarkers is unknown. We investigated a wide range of biomarker profiles in acute heart failure across the body mass index (BMI) spectrum. METHODS AND RESULTS: A total of 48 biomarkers, assessing multiple pathophysiological pathways, were measured in 2033 patients included in PROTECT (Placebo-Controlled Randomized Study of the Selective A1 Adenosine Receptor Antagonist Rolofylline for Patients Hospitalized With Acute Decompensated Heart Failure and Volume Overload to Assess Treatment Effect on Congestion and Renal Function), a trial comparing the effects of rolofylline to placebo in patients with acute heart failure...
January 2017: Circulation. Heart Failure
https://www.readbyqxmd.com/read/28051097/aged-garlic-has-more-potent-antiglycation-and-antioxidant-properties-compared-to-fresh-garlic-extract-in-vitro
#4
Abdulhakim Elosta, Mark Slevin, Khalid Rahman, Nessar Ahmed
Protein glycation involves formation of early (Amadori) and late advanced glycation endproducts (AGEs) together with free radicals via autoxidation of glucose and Amadori products. Glycation and increased free radical activity underlie the pathogenesis of diabetic complications. This study investigated whether aged garlic has more potent antiglycation and antioxidant properties compared to fresh garlic extract in vitro in a cell-free system. Proteins were glycated by incubation with sugars (glucose, methylglyoxal or ribose) ±5-15 mg/mL of aged and fresh garlic extracts...
January 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28012919/ilex-paraguariensis-and-its-main-component-chlorogenic-acid-inhibit-fructose-formation-of-advanced-glycation-endproducts-with-amino-acids-at-conditions-compatible-with-those-in-the-digestive-system
#5
Yasmin Bains, Alejandro Gugliucci
We have previously shown that Ilex paraguariensis extracts have potent antiglycation actions. Associations of excess free fructose consumption with inflammatory diseases have been proposed to be mediated through in situ enteral formation of fructose AGEs, which, after being absorbed may contribute to inflammatory diseases via engagement of RAGE. In this proof of principle investigation we show fluorescent AGE formation between amino acids (Arg, Lys, Gly at 10-50mM) and fructose (10-50mM) under time, temperature, pH and concentrations compatible with the digestive system lumen and its inhibition by Ilex paraguariensis extracts...
December 22, 2016: Fitoterapia
https://www.readbyqxmd.com/read/27965400/decreased-levels-of-srage-in-follicular-fluid-from-patients-with-pcos
#6
BiJun Wang, Jing Li, Qingling Yang, FuLi Zhang, MengMeng Hao, Yi-Hong Guo
This study aimed to explore the association between soluble receptor for advanced glycation endproducts (sRAGE) levels in follicular fluid and the number of oocytes retrieved and to evaluate the effect of sRAGE on vascular endothelial growth factor (VEGF) in granulosa cells in patients with polycystic ovarian syndrome (PCOS). Two sets of experiments were performed in this study. In part one, sRAGE and VEGF protein levels in follicular fluid samples from 39 patients with PCOS and 35 non-PCOS patients were measured by ELISA...
December 13, 2016: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/27965099/glucagon-like-peptide-1-inhibits-the-receptor-for-advanced-glycation-endproducts-to-prevent-podocyte-apoptosis-induced-by-advanced-oxidative-protein-products
#7
Shuang-Shuang Zhang, Zhou Wu, Zhen Zhang, Zhou-Yi Xiong, Hong Chen, Qiao-Bing Huang
OBJECTIVE: To investigate whether and how glucagon-like peptide-1 (GLP-1) can protect podocytes from apoptosis induced by advanced oxidative protein products (AOPPs). METHODS: Murine podocytes were stimulated with 200 μg/ml AOPP for 48 h in the presence or absence of GLP-1. Cell viability was assessed using the cell counting kit-8 assay. Podocyte apoptosis was detected by flow cytometry and Hoechst 33258 staining. Superoxide radical production was assayed using lucigenin-enhanced chemiluminescence, and Western blotting was used to measure expression of RAGE, NADPH oxidase subunits p47(phox) and gp91(phox), as well as apoptosis-associated proteins p53, Bax, Bcl-2 and caspase-3...
January 22, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27956549/loss-of-glyoxalase-1-induces-compensatory-mechanism-to-achieve-dicarbonyl-detoxification-in-mammalian-schwann-cells
#8
Jakob Morgenstern, Thomas Fleming, Dagmar Schumacher, Volker Eckstein, Marc Freichel, Stephan Herzig, Peter Nawroth
The glyoxalase system is a highly specific enzyme system existing in all mammalian cells which is responsible for the detoxification of dicarbonyl species, primarily methylglyoxal (MG). It has been implicated to play an essential role in preventing the increased formation of advanced glycation endproducts under certain pathological conditions. We have established the first glyoxalase 1 knock-out model (GLO1-/-) in mammalian Schwann cells using CRISPR/Cas9 technique to investigate compensatory mechanisms. Neither elevated concentrations of MG nor associated protein modifications were observed in GLO1-/- cells...
December 12, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27926755/surface-area-of-detachment-proliferative-vitreoretinopathy-and-pulse-pressure-but-not-ages-are-associated-with-retinal-redetachment
#9
Bernardina T Fokkens, Douwe J Mulder, Michiel B Nugteren, Casper G Schalkwijk, Jean L Scheijen, Andries J Smit, Leonoor I Los
Purpose: Advanced glycation endproducts (AGEs) have been suggested to play a role in retinal redetachment by promoting proliferative vitreoretinopathy (PVR). The purpose of this study was to investigate whether AGEs, in combination with other clinical characteristics, were able to identify patients at high risk for redetachment after vitrectomy for rhegmatogenous retinal detachment (RRD). Methods: In this prospective cohort study, 410 RRD patients were included...
December 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27913191/the-shedding-derived-soluble-receptor-for-advanced-glycation-endproducts-sustains-inflammation-during-acute-pseudomonas-aeruginosa-lung-infection
#10
Antonella Antonelli, Stefania Di Maggio, Joanna Rejman, Francesca Sanvito, Alice Rossi, Alessandro Catucci, Andrea Gorzanelli, Alessandra Bragonzi, Marco E Bianchi, Angela Raucci
BACKGROUND: The membrane-bound isoform of the receptor for advanced glycation end products (FL-RAGE) is primarily expressed by alveolar epithelial cells and undergoes shedding by the protease ADAM10, giving rise to soluble cleaved RAGE (cRAGE). RAGE has been associated with the pathogenesis of several acute and chronic lung disorders. Whether the proteolysis of FL-RAGE is altered by a given inflammatory stimulus is unknown. Pseudomonas aeruginosa causes nosocomial infections in hospitalized patients and is the major pathogen associated with chronic lung diseases...
February 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27870582/markers-of-islet-endothelial-dysfunction-occur-in-male-db-db-mice-and-may-contribute-to-reduced-insulin-release
#11
Meghan F Hogan, Amy W Liu, Michael J Peters, Joshua R Willard, Zaheen Rabbani, Erik C Bartholomew, Adam Ottley, Rebecca L Hull
Islet endothelial cells produce paracrine factors that support β-cell function and growth. Endothelial dysfunction underlies diabetic microvascular complications; thus we hypothesized that in diabetes, islet endothelial cells become dysfunctional and this may contribute to β-cell secretory dysfunction. Islets/islet endothelial cells were isolated from diabetic db/db mice, treated with or without the glucose-lowering agent phlorizin, or C57BL/6J mice fed a high fat diet for 18 weeks (and appropriate controls)...
November 21, 2016: Endocrinology
https://www.readbyqxmd.com/read/27858716/skin-autofluorescence-examination-as%C3%A2-a%C3%A2-diagnostic-tool-for-mild-cognitive-impairment-in-healthy-people
#12
Michiya Igase, Maya Ohara, Keiji Igase, Takeaki Kato, Yoko Okada, Masayuki Ochi, Yasuharu Tabara, Katsuhiko Kohara, Yasumasa Ohyagi
BACKGROUND: Accumulation of advanced glycation endproducts (AGEs) is thought to be involved in the pathogenesis of dementia, especially Alzheimer's disease. Tissue AGE accumulation can be estimated using the relative simple noninvasive measurement of skin autofluorescence (SAF), a method based on the fluorescent properties of some AGEs. However, possible involvement of tissue AGE accumulation in mild cognitive impairment (MCI) has not been fully investigated. OBJECTIVE: We investigated whether tissue AGE accumulation estimated by SAF is associated with mild cognitive impairment...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27858225/putative-model-for-heat-shock-protein-70-complexation-with-receptor-of-advanced-glycation-end-products-through-fluorescence-proximity-assays-and-normal-mode-analyses
#13
Marcelo Sartori Grunwald, Rodrigo Ligabue-Braun, Cristiane Santos Souza, Luana Heimfarth, Hugo Verli, Daniel Pens Gelain, José Cláudio Fonseca Moreira
Extracellular heat shock protein 70 (HSP70) is recognized by receptors on the plasma membrane, such as Toll-like receptor 4 (TLR4), TLR2, CD14, and CD40. This leads to activation of nuclear factor-kappa B (NF-κB), release of pro-inflammatory cytokines, enhancement of the phagocytic activity of innate immune cells, and stimulation of antigen-specific responses. However, the specific characteristics of HSP70 binding are still unknown, and all HSP70 receptors have not yet been described. Putative models for HSP70 complexation to the receptor for advanced glycation endproducts (RAGEs), considering both ADP- and ATP-bound states of HSP70, were obtained through molecular docking and interaction energy calculations...
November 17, 2016: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/27809834/in-vitro-inhibitory-activities-of-selected-australian-medicinal-plant-extracts-against-protein-glycation-angiotensin-converting-enzyme-ace-and-digestive-enzymes-linked-to-type-ii-diabetes
#14
Permal Deo, Erandi Hewawasam, Aris Karakoulakis, David J Claudie, Robert Nelson, Bradley S Simpson, Nicholas M Smith, Susan J Semple
BACKGROUND: There is a need to develop potential new therapies for the management of diabetes and hypertension. Australian medicinal plants collected from the Kuuku I'yu (Northern Kaanju) homelands, Cape York Peninsula, Queensland, Australia were investigated to determine their therapeutic potential. Extracts were tested for inhibition of protein glycation and key enzymes relevant to the management of hyperglycaemia and hypertension. The inhibitory activities were further correlated with the antioxidant activities...
November 4, 2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27805071/ages-induced-autophagy-impairs-cutaneous-wound-healing-via-stimulating-macrophage-polarization-to-m1-in-diabetes
#15
Yuanyuan Guo, Cai Lin, Peng Xu, Shan Wu, Xiujun Fu, Weidong Xia, Min Yao
Autophagy is essential in physiological and pathological processes, however, the role of autophagy in cutaneous wound healing and the underlying molecular mechanism remain elusive. We hypothesized that autophagy plays an important role in regulating wound healing. Here, we show that enhanced autophagy negatively impacts on normal cutaneous healing process and is related to chronic wounds as demonstrated by the increased LC3 in diabetic mice skin or patients' chronic wounds. In addition, inhibition of autophagy by 3-MA restores delayed healing in C57BL/6 or db/db mice, demonstrating that autophagy is involved in regulating wound healing...
November 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27783390/age-and-sex-distributions-of-age-related-biomarker-values-in-healthy-older-adults-from-the-long-life-family-study
#16
Paola Sebastiani, Bharat Thyagarajan, Fangui Sun, Lawrence S Honig, Nicole Schupf, Stephanie Cosentino, Mary F Feitosa, Mary Wojczynski, Anne B Newman, Monty Montano, Thomas T Perls
OBJECTIVES: To determine reference values for laboratory tests in individuals aged 85 and older. DESIGN: Cross-sectional cohort study. SETTING: International. PARTICIPANTS: Long Life Family Study (LLFS) participants (N~5,000, age: range 25-110, median 67, 45% male). MEASUREMENTS: Serum biomarkers were selected based on association with aging-related diseases and included complete blood count, lipids (triglycerides, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, total cholesterol), 25-hydroxyvitamin D2 and D3, vitamin D epi-isomer, diabetes mellitus-related biomarkers (adiponectin, insulin, insulin-like growth factor 1, glucose, glycosylated hemoglobin, soluble receptor for advanced glycation endproduct), kidney disease-related biomarkers (albumin, creatinine, cystatin), endocrine biomarkers (dehydroepiandrosterone, sex-hormone binding globulin, testosterone), markers of inflammation (interleukin 6, high-sensitivity C-reactive protein, N-terminal pro b-type natriuretic peptide), ferritin, and transferrin...
November 2016: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/27776915/reduction-in-ins-7-gene-expression-in-non-neuronal-cells-of-high-glucose-exposed-caenorhabditis-elegans-protects-from-reactive-metabolites-preserves-neuronal-structure-and-head-motility-and-prolongs-lifespan
#17
Michael Mendler, Christin Riedinger, Andrea Schlotterer, Nadine Volk, Thomas Fleming, Stephan Herzig, Peter P Nawroth, Michael Morcos
BACKGROUND: Glucose derived metabolism generates reactive metabolites affecting the neuronal system and lifespan in C. elegans. Here, the role of the insulin homologue ins-7 and its downstream effectors in the generation of high glucose induced neuronal damage and shortening of lifespan was studied. RESULTS: In C. elegans high glucose conditions induced the expression of the insulin homologue ins-7. Abrogating ins-7 under high glucose conditions in non-neuronal cells decreased reactive oxygen species (ROS)-formation and accumulation of methylglyoxal derived advanced glycation endproducts (AGEs), prevented structural neuronal damage and normalised head motility and lifespan...
October 1, 2016: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/27760316/hmgb1-activates-proinflammatory-signaling-via-tlr5-leading-to-allodynia
#18
Nabanita Das, Varun Dewan, Peter M Grace, Robin J Gunn, Ryo Tamura, Netanel Tzarum, Linda R Watkins, Ian A Wilson, Hang Yin
Infectious and sterile inflammatory diseases are correlated with increased levels of high mobility group box 1 (HMGB1) in tissues and serum. Extracellular HMGB1 is known to activate Toll-like receptors (TLRs) 2 and 4 and RAGE (receptor for advanced glycation endproducts) in inflammatory conditions. Here, we find that TLR5 is also an HMGB1 receptor that was previously overlooked due to lack of functional expression in the cell lines usually used for studying TLR signaling. HMGB1 binding to TLR5 initiates the activation of NF-κB signaling pathway in a MyD88-dependent manner, resulting in proinflammatory cytokine production and pain enhancement in vivo...
October 18, 2016: Cell Reports
https://www.readbyqxmd.com/read/27734162/insights-into-binding-of-s100-proteins-to-scavenger-receptors-class-b-scavenger-receptor-cd36-binds-s100a12-with-high-affinity
#19
Christoph Tondera, Markus Laube, Jens Pietzsch
The EF-hand type calcium-binding protein S100A12 exerts numerous intra- and extracellular functions of (patho)physiological relevance. Therefore, receptors of S100A12 are of high interest for research and clinical applications. Beside the extensively studied receptor for advanced glycation endproducts (RAGE), G-protein coupled receptors and more recently, scavenger receptors are suggested to be putative S100A12 receptors. Own findings and further information from the literature predestined CD36, a class B scavenger receptor, as promising candidate...
January 2017: Amino Acids
https://www.readbyqxmd.com/read/27720951/ligand-binding-affinity-and-changes-in-the-lateral-diffusion-of-receptor-for-advanced-glycation-endproducts-rage
#20
Aleem Syed, Qiaochu Zhu, Emily A Smith
The effect of ligand on the lateral diffusion of receptor for advanced glycation endproducts (RAGE), a receptor involved in numerous pathological conditions, remains unknown. Single particle tracking experiments that use quantum dots specifically bound to hemagglutinin (HA)-tagged RAGE (HA-RAGE) are reported to elucidate the effect of ligand binding on HA-RAGE diffusion in GM07373 cell membranes. The ligand used in these studies is methylglyoxal modified-bovine serum albumin (MGO-BSA) containing advanced glycation end products modifications...
December 2016: Biochimica et Biophysica Acta
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