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Inhibition of glycation

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https://www.readbyqxmd.com/read/27913191/the-shedding-derived-soluble-receptor-for-advanced-glycation-endproducts-sustains-inflammation-during-acute-pseudomonas-aeruginosa-lung-infection
#1
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...
November 29, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27894247/aldose-reductase-as-a-drug-target-for-treatment-of-diabetic-nephropathy-promises-and-challenges
#2
Heba El Gamal, Shankar Munusamy
Diabetic nephropathy (DN) is one of the most serious microvascular complications of diabetes mellitus and the leading cause of end stage renal disease. One of the key pathways activated in DN is the polyol pathway, in which glucose is converted to sorbitol (a relatively non-metabolizable sugar) by the enzyme aldose reductase (AR). Shunting of glucose into this pathway causes disruption to glucose metabolism and subsequently damages the tissues via increased oxidative stress, protein kinase c activation and production of advanced glycation end products (AGE) in the kidney...
November 28, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27876336/inhibition-of-protein-glycation-antioxidant-and-antiproliferative-activities-of-carpobrotus-edulis-extracts
#3
Jawhar Hafsa, Khaoula Mkadmini Hammi, Med Raâfet Ben Khedher, Med Ali Smach, Bassem Charfeddine, Khalifa Limem, Hatem Majdoub
Carpobrotus edulis is an important South African medicinal plants used as a food and therapeutic agent in traditional medicine. The aim of this study was to determine the phytochemical content, antioxidant, antiglycation and cytotoxic effect against Human Colon Cancer Cell Line (HCT-116) of aqueous and ethanol-water (1:1v/v) extracts of Carpobrotus edulis.The content of total phenolics and flavonoids in aqueous and ethanol-water extract were 151.99μg and 66.35μg gallic acid equivalents/mg of dry extract, and 38...
November 19, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27858401/intervertebral-disc-degeneration-ectopic-calcification-advanced-glycation-end-products-nucleus-pulposus-cells
#4
S Illien-Jünger, O M Torre, W F Kindschuh, X Chen, D M Laudier, J C Iatridis
Ectopic calcifications in intervertebral discs (IVDs) are known characteristics of IVD degeneration that are not commonly reported but may be implicated in structural failure and dysfunctional IVD cell metabolic responses. This study investigated the novel hypothesis that ectopic calcifications in the IVD are associated with advanced glycation end products (AGEs) via hypertrophy and osteogenic differentiation. Histological analyses of human IVDs from several degeneration stages revealed areas of ectopic calcification within the nucleus pulposus and at the cartilage endplate...
November 18, 2016: European Cells & Materials
https://www.readbyqxmd.com/read/27845223/linolenic-acid-prevents-early-and-advanced-glycation-end-products-ages-modification-of-albumin
#5
Govindarajan Prasanna, N T Saraswathi
In this study, we report the protective effects of linolenic acid towards the formation of early (HbA1c) and advanced glycation end-products (AGEs) based on fluorescence, circular dichroism, confocal microscopy and molecular interaction studies. Linolenic acid was found to be a potent inhibitor of AGEs formed by both glucose and fructose. The HbA1c (early glycation product) level was found to be reduced to 7.4% when compared to glycated control (8.4%). Similarly, linolenic acid also inhibited the methylglyoxal mediated AGEs formation...
November 11, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27830702/hyperglycaemia-inhibits-reg3a-expression-to-exacerbate-tlr3-mediated-skin-inflammation-in-diabetes
#6
Yelin Wu, Yanchun Quan, Yuanqi Liu, Keiwei Liu, Hongquan Li, Ziwei Jiang, Tian Zhang, Hu Lei, Katherine A Radek, Dongqing Li, Zhenhua Wang, Jilong Lu, Wang Wang, Shizhao Ji, Zhaofan Xia, Yuping Lai
Dysregulated inflammatory responses are known to impair wound healing in diabetes, but the underlying mechanisms are poorly understood. Here we show that the antimicrobial protein REG3A controls TLR3-mediated inflammation after skin injury. This control is mediated by REG3A-induced SHP-1 protein, and acts selectively on TLR3-activated JNK2. In diabetic mouse skin, hyperglycaemia inhibits the expression of IL-17-induced IL-33 via glucose glycation. The decrease in cutaneous IL-33 reduces REG3A expression in epidermal keratinocytes...
November 10, 2016: Nature Communications
https://www.readbyqxmd.com/read/27830156/administration-of-traditional-chinese-blood-circulation-activating-drugs-for-microvascular-complications-in-patients-with-type-2-diabetes-mellitus
#7
REVIEW
Lisha He, Han Wang, Chengjuan Gu, Xinhui He, Linhua Zhao, Xiaolin Tong
Traditional Chinese medicine (TCM) is an important complementary strategy for treating diabetes mellitus (DM) in China. Traditional Chinese blood circulation activating drugs are intended to guide an overall approach to the prevention and treatment of microvascular complications of DM. The core mechanism is related to the protection of the vascular endothelium and the basement membrane. Here, we reviewed the scientific evidence underpinning the use of blood circulation activating drugs to prevent and treat DM-induced microvascular complications, including diabetic nephropathy (DN), diabetic peripheral neuropathy (DPN), and diabetic retinopathy (DR)...
2016: Journal of Diabetes Research
https://www.readbyqxmd.com/read/27830011/catalpol-ameliorates-diabetic-atherosclerosis-in-diabetic-rabbits
#8
Jiang-Yue Liu, Chen-Zhao Zheng, Xin-Ping Hao, Dai-Juan Zhang, An-Wei Mao, Ping Yuan
Catalpol, isolated from the roots of Rehmanniaglutinosa, Chinese foxglove, is an iridoid glycoside with antioxidant, anti-inflammatory and anti-hyperglycemic agent. The present study was to investigate the effects of catalpol on diabetic atherosclerosis in alloxan-induced diabetic rabbits. Diabetes was induced in rabbits by a hyperlipidemic diet and intravenous injection of alloxan (100 mg/kg). Rabbits were treated for 12 weeks. The fasting blood glucose, insulin, homeostasis model of insulin resistance, total cholesterol and triglyceride were measured...
2016: American Journal of Translational Research
https://www.readbyqxmd.com/read/27822918/ferulic-acid-prevents-methylglyoxal-induced-protein-glycation-dna-damage-and-apoptosis-in-pancreatic-%C3%AE-cells
#9
Weerachat Sompong, Henrique Cheng, Sirichai Adisakwattana
Methylglyoxal (MG) can react with amino acids of proteins to induce protein glycation and consequently the formation of advanced glycation end-products (AGEs). Previous studies reported that ferulic acid (FA) prevented glucose-, fructose-, and ribose-induced protein glycation. In this study, FA (0.1-1 mM) inhibited MG-induced protein glycation and oxidative protein damage in bovine serum albumin (BSA). Furthermore, FA (0.0125-0.2 mM) protected against lysine/MG-mediated oxidative DNA damage, thereby inhibiting superoxide anion and hydroxyl radical generation during lysine and MG reaction...
November 7, 2016: Journal of Physiology and Biochemistry
https://www.readbyqxmd.com/read/27822337/on-the-anticataractogenic-effects-of-l-carnosine-is-it-best-described-as-an-antioxidant-metal-chelating-agent-or-glycation-inhibitor
#10
Hamdy Abdelkader, Michael Longman, Raid G Alany, Barbara Pierscionek
Purpose. L-Carnosine is a naturally occurring dipeptide which recently gained popularity as an anticataractogenic agent due to its purported antioxidant activities. There is a paucity of research and conclusive evidence to support such claims. This work offers compelling data that help clarify the mechanism(s) behind the anticataract properties of L-carnosine. Methods. Direct in vitro antioxidant free radical scavenging properties were assayed using three different antioxidant (TEAC, CUPRAC, and DPPH) assays...
2016: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/27816946/advanced-glycation-end-products-mediated-cellular-and-molecular-events-in-the-pathology-of-diabetic-nephropathy
#11
Anil Kumar Pasupulati, P Swathi Chitra, G Bhanuprakash Reddy
Diabetic nephropathy (DN) is a major cause of morbidity and mortality in diabetic patients and a leading cause of end-stage renal disease (ESRD). Degenerative changes such as glomerular hypertrophy, hyperfiltration, widening of basement membranes, tubulointerstitial fibrosis, glomerulosclerosis and podocytopathy manifest in various degrees of proteinuria in DN. One of the key mechanisms implicated in the pathogenesis of DN is non-enzymatic glycation (NEG). NEG is the irreversible attachment of reducing sugars onto free amino groups of proteins by a series of events, which include the formation of Schiff's base and an Amadori product to yield advanced glycation end products (AGEs)...
December 1, 2016: Biomolecular Concepts
https://www.readbyqxmd.com/read/27816762/long-term-administration-of-advanced-glycation-end-product-stimulates-the-activation-of-nlrp3-inflammasome-and-sparking-the-development-of-renal-injury
#12
Wan-Ju Yeh, Hsin-Yi Yang, Man-Hui Pai, Chi-Hao Wu, Jiun-Rong Chen
The accumulation of advanced glycation end-products (AGEs) and the enhanced interaction of AGE with their cellular receptor (RAGE) have been implicated in the progression of chronic kidney disease. The purpose of this study was to examine whether the AGE/RAGE-induced nephrotoxic effects are associated with inflammasome activation and endothelial dysfunction. Chronic renal injury was examined in BALB/c mice by the long-term administration of carbonyl-AGE for 16 weeks. Endothelial dysfunction was detected by measuring the number of circulating endothelial progenitor cells (EPCs) and the levels of nitric oxide synthase (eNOS) and nitric oxide (NO) in kidneys...
January 2017: Journal of Nutritional Biochemistry
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
#13
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/27809830/the-ethyl-acetate-fraction-of-corn-silk-exhibits-dual-antioxidant-and-anti-glycation-activities-and-protects-insulin-secreting-cells-from-glucotoxicity
#14
Chia-Chuan Chang, Wei Yuan, Hsiao-Yuh Roan, Jia-Ling Chang, Hsiu-Chen Huang, Yu-Ching Lee, Huey Jen Tsay, Hui-Kang Liu
BACKGROUND: In this study, we aimed to develop a Stigmata Maydis (corn silk) fraction with dual bio-activities against oxidative stress and protein glycation to protect β-cells from diabetes-induced failure. METHODS: Corn silk fractions were prepared by partition and chemically characterised by thin-layer chromatography. Free radical scavenging assay, glycation assay, and cell-based viability test (neutral red) were employed to decide the best fraction. Cell death analysis was executed by annexin V/ Propidium iodide staining...
November 3, 2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27809300/inhibition-of-autophagy-increased-age-ros-mediated-apoptosis-in-mesangial-cells
#15
Li Xu, Qiuling Fan, Xu Wang, Xue Zhao, Lining Wang
The aim of our study was to investigate the role of autophagy, a homeostatic process involved in the lysosomal degradation of damaged cell organelles and proteins, in regulating the survival of mesangial cells treated with advanced glycation end products (AGEs). In the present study, AGEs induced mitochondrial depolarization and led to mitochondrial-dependent apoptosis in mesangial cells, as shown by the loss of the mitochondrial membrane potential; increased Bax processing; increased Caspase-9, Caspase-3 and PARP cleavage; and decreased Bcl-2 expression...
November 3, 2016: Cell Death & Disease
https://www.readbyqxmd.com/read/27805306/spectroscopic-and-in-silico-study-of-binding-mechanism-of-cynidine-3-o-glucoside-with-human-serum-albumin-and-glycated-human-serum-albumin
#16
Xin Gao, Hongna Bi, Jingjing Jia, Lin Tang
The drug-serum albumin interaction plays a dominant role in drug efficacy and disposition. The glycation of serum albumin that occurs during diabetes may affect its drug-binding properties in vivo. In order to evaluate the interactivity characteristics of cyanidin-3-O-glucoside (C3G) with human serum albumin (HSA) and glycated human serum albumin (gHSA), this study was undertaken using multiple spectroscopic techniques and molecular modeling analysis. Time-resolved fluorescence and the thermodynamic parameters indicated that the quenching mechanism was static quenching, and hydrogen bonding and Van der Waals force were the main forces...
November 2, 2016: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/27805071/ages-induced-autophagy-impairs-cutaneous-wound-healing-via-stimulating-macrophage-polarization-to-m1-in-diabetes
#17
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/27804999/overexpression-of-soluble-rage-in-mesenchymal-stem-cells-enhances-their-immunoregulatory-potential-for-cellular-therapy-in-autoimmune-arthritis
#18
Min-Jung Park, Seung Hoon Lee, Su-Jin Moon, Jung-Ah Lee, Eun-Jung Lee, Eun-Kyung Kim, Jin-Sil Park, Jennifer Lee, Jun-Ki Min, Seok Jung Kim, Sung-Hwan Park, Mi-La Cho
Mesenchymal stem cells (MSCs) are attractive agents for cellular therapy in rheumatoid arthritis (RA). The receptor for advanced glycation end products (RAGE) serves as a pattern recognition receptor for endogenous inflammatory ligands. Soluble RAGE (sRAGE) is a truncated form of RAGE that functions as a decoy and acts as an anti-inflammatory molecule. The aim of this study was to determine whether sRAGE has therapeutic effects and the mechanisms active in sRAGE-overexpressing MSCs (sRAGE-MSCs) in an experimental model of RA...
November 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27784187/renoprotective-effect-of-bacopa-monnieri-via-inhibition-of-advanced-glycation-end-products-and-oxidative-stress-in-stz-nicotinamide-induced-diabetic-nephropathy
#19
Lalit Kishore, Navpreet Kaur, Randhir Singh
Hyperglycemia and oxidative stress are involved in the development of diabetic nephropathy (DN). This study was designed to evaluate the effect of alcohol and hydroalcohol extract of Bacopa monnieri and stigmasterol isolated from B. monnieri in the treatment of DN. Diabetes was induced in male wistar rats by streptozotocin (65 mg/kg i.p.) 15 min after nicotinamide (230 mg/kg, i.p.) administration. After 30 days, the rats were treated with different doses of extracts (100, 200, and 400 mg/kg) and stigmasterol (5 and 10 mg/kg) for 45 days to analyze their nephroprotective effect and produced significant attenuation in the serum glucose level, uric acid, creatinine, and lipid levels...
October 26, 2016: Renal Failure
https://www.readbyqxmd.com/read/27761470/metformin-inhibits-advanced-glycation-end-products-induced-inflammatory-response-in-murine-macrophages-partly-through-ampk-activation-and-rage-nf%C3%AE%C2%BAb-pathway-suppression
#20
Zhong'e Zhou, Yong Tang, Xian Jin, Chengjun Chen, Yi Lu, Liang Liu, Chengxing Shen
Advanced glycation end products (AGEs) are major inflammatory mediators in diabetes, affecting atherosclerosis progression via macrophages. Metformin slows diabetic atherosclerosis progression through mechanisms that remain to be fully elucidated. The present study of murine bone marrow derived macrophages showed that (1) AGEs enhanced proinflammatory cytokines (interleukin-1β (IL-1β), IL-6, and tumor necrosis factor-α (TNF-α)) mRNA expression, RAGE expression, and NFκB activation; (2) metformin pretreatment inhibited AGEs effects and AGEs-induced cluster designation 86 (CD86) (M1 marker) expression, while promoting CD206 (M2 marker) surface expression and anti-inflammatory cytokine (IL-10) mRNA expression; and (3) the AMPK inhibitor, Compound C, attenuated metformin effects...
2016: Journal of Diabetes Research
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