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Methylation foam cells

Guangzhi Cong, Ru Yan, Hui Huang, Kai Wang, Ning Yan, Ping Jin, Na Zhang, Jianjun Hou, Dapeng Chen, Shaobin Jia
AIMS: Hyperhomocysteinemia (Hhcy) is an independent risk factor of atherosclerosis and promotes unstable plaque formation. Epigenetic mechanisms play an important role in the pathogenesis of atherosclerosis induced by Hhcy. However, the exact mechanism is still undefined. Lesional apoptotic cells and necrotic core formation contribute greatly to the progression of plaque. The present study sought to determine whether modification of histone methylation is involved in macrophage apoptosis and unstable plaque formation in the condition of Hhcy...
March 15, 2017: Life Sciences
Yang Xiaoling, Zhao Li, Li ShuQiang, Ma Shengchao, Yang Anning, Ding Ning, Li Nan, Jia Yuexia, Yang Xiaoming, Li Guizhong, Jiang Yideng
Hyperhomocysteinemia (HHcy) is an independent risk factor for cardiovascular diseases, such as atherosclerosis. HHcy promotes atherogenesis by modifying the histone methylation patterns and miRNA regulation. In this study, we investigated the effects of homocysteine (Hcy) on the expression of enhancer of zeste homolog 2 (EZH2), and tested our hypothesis that Hcy-induced atherosclerosis is mediated by increased EZH2 expression, which is regulated by miR-92a. The levels of EZH2 and H3K27me3 were increased in the aorta of ApoE-/- mice fed a high-methionine diet for 16 weeks, whereas miR-92a expression was decreased...
2016: PloS One
Chun-Min Kang, Yan-Wei Hu, Ying Nie, Jia-Yi Zhao, Shu-Fen Li, Shuai Chu, Hai-Xia Li, Qing-Shui Huang, Yu-Rong Qiu
Early reports suggest that nuclear factor IA (NFIA) is important in the pathogenesis of glioma. Our previous study demonstrated that the long non‑coding RNA (lncRNA), RP5‑833A20.1, suppressed the expression of NFIA in THP‑1 macrophage-derived foam cells. However, the effect and possible mechanism of RP5‑833A20.1 on glioma remains to be fully elucidated, and whether the NFIA-dependent pathway is involved in its progression has not been investigated. In the present study, the mechanisms by which RP5‑833A20...
December 2016: Molecular Medicine Reports
Oren Rom, Hila Korach-Rechtman, Tony Hayek, Yael Danin-Poleg, Haim Bar, Yechezkel Kashi, Michael Aviram
The unsaturated aldehyde acrolein is pro-atherogenic, and the polyphenol-rich pomegranate juice (PJ), known for its anti-oxidative/anti-atherogenic properties, inhibits macrophage foam cell formation, the hallmark feature of early atherosclerosis. This study aimed to investigate two unexplored areas of acrolein atherogenicity: macrophage lipid metabolism and the gut microbiota composition. The protective effects of PJ against acrolein atherogenicity were also evaluated. Atherosclerotic apolipoprotein E-deficient (apoE(-/-)) mice that were fed acrolein (3 mg/kg/day) for 1 month showed significant increases in serum and aortic cholesterol, triglycerides, and lipid peroxides...
September 30, 2016: Archives of Toxicology
Sayyeda M Hasan, Alexandra D Easley, Mary Beth Browning Monroe, Duncan J Maitland
HYPOTHESIS: Polyurethane foaming surfactants are cell stabilized at the polymer-gas interface during foam blowing to prevent bubble coalescence. Siloxane-based surfactants are typically used to generate a surface tension gradient at the interface. The chemical structure of the hydrophobic and hydrophilic units affects surfactant properties, which can further influence foam morphology. EXPERIMENTS: Siloxane-polyethylene glycol (PEG) ether amphiphiles were synthesized in high yield via hydrosilylation to serve as surfactants for shape memory polymer (SMP) foams...
September 15, 2016: Journal of Colloid and Interface Science
Yun-Cheng Lv, Yan-Yan Tang, Ping Zhang, Wei Wan, Feng Yao, Ping-Ping He, Wei Xie, Zhong-Cheng Mo, Jin-Feng Shi, Jian-Feng Wu, Juan Peng, Dan Liu, Francisco S Cayabyab, Xi-Long Zheng, Xiang-Yang Tang, Xin-Ping Ouyang, Chao-Ke Tang
ATP-binding cassette transporter A1 (ABCA1) plays a critical role in maintaining cellular cholesterol homeostasis. The purpose of this study is to identify the molecular mechanism(s) underlying ABCA1 epigenetic modification and determine its potential impact on ABCA1 expression in macrophage-derived foam cell formation and atherosclerosis development. DNA methylation induced foam cell formation from macrophages and promoted atherosclerosis in apolipoprotein E-deficient (apoE-/-) mice. Bioinformatics analyses revealed a large CpG island (CGI) located in the promoter region of ABCA1...
2016: PloS One
Caroline Coisne, Dorothée Hallier-Vanuxeem, Marie-Christine Boucau, Johan Hachani, Sébastien Tilloy, Hervé Bricout, Eric Monflier, Daniel Wils, Michel Serpelloni, Xavier Parissaux, Laurence Fenart, Fabien Gosselet
Atherosclerosis is an inflammatory disease that leads to an aberrant accumulation of cholesterol in vessel walls forming atherosclerotic plaques. During this process, the mechanism regulating complex cellular cholesterol pools defined as the reverse cholesterol transport (RCT) is altered as well as expression and functionality of transporters involved in this process, namely ABCA1, ABCG1, and SR-BI. Macrophages, arterial endothelial and smooth muscle cells (SMCs) have been involved in the atherosclerotic plaque formation...
2016: Frontiers in Physiology
Yura Hyun, Heai-Ku Park, Ho-Seon Park, Chang-Seop Lee
The carbon nanofibers (CNFs) and Si-CNFs composite were synthesized using a chemical vapor deposition (CVD) method with an iron-copper catalyst and silicon-covered Ni foam. Acetylene as a carbon source was flowed into the quartz reactor of a tubular furnace heated to 600 degrees C. This temperature was maintained for 10 min to synthesize the CNFs. The morphologies, compositions, and crystal quality of the prepared CNFs were characterized by Scanning electron microscopy (SEM), Energy dispersive spectroscopy (EDS), X-ray Diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS)...
November 2015: Journal of Nanoscience and Nanotechnology
An-Ning Yang, Hui-Ping Zhang, Yue Sun, Xiao-Ling Yang, Nan Wang, Guangrong Zhu, Hui Zhang, Hua Xu, Sheng-Chao Ma, Yue Zhang, Gui-Zhong Li, Yue-Xia Jia, Jun Cao, Yi-Deng Jiang
Homocysteine (Hcy) is an independent risk factor for atherosclerosis, but the underlying molecular mechanisms are not known. We investigated the effects of Hcy on fatty acid-binding protein 4 (FABP4), and tested our hypothesis that Hcy-induced atherosclerosis is mediated by increased FABP4 expression and decreased methylation. The FABP4 expression and DNA methylation was assessed in the aorta of ApoE(-/-) mice fed high-methionine diet for 20weeks. Over-expression of FABP4 enhanced accumulation of total cholesterol and cholesterol ester in foam cells...
December 21, 2015: FEBS Letters
Ming-Ching Cheng, Wen-Hua Chang, Chih-Wei Chen, Wen-Wing Li, Chin-Yin Tseng, Tuzz-Ying Song
Pine (Pinus morrisonicola Hay, PM) needles have been used as folk medicine for their antihypertension and lipid-lowering effects. As supercritical fluid extraction (SFE) is considered an ideal technique for the extraction of essential oil from plant materials, the present work investigated the optimal SFE conditions and the protective effects of different resulting fractions of PM needles on lipid peroxidation and foam cell production in macrophages. Nine PM needle extracts (PME1-9) were obtained in 1%-4% yields using different SFE conditions, of which PME1 had the lowest yield (1...
2015: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Xiao Wang, Chang Liu, Peng Liu, Ni Li, Yan-Ni Xu, Shu-Yi Si
ATP-binding cassette transporter A1 (ABCA1) and scavenger receptor class B type I (SR-BI/CLA-1) are the key proteins in reverse cholesterol transport (RCT). The high expression of ABCA1 and SR-BI/CLA-1 can decrease the danger of atherosclerosis. The purpose of the study is to find ABCA1 and CLA-1up-regulators for treating atherosclerosis by using cell-based high throughput screening models. Among 20 000 compounds screened, E0869 [1-(3, 4-dimethylphenyl)-1-oxopropan-2-yll4-((methylsulfonyl)methyl)benzoate] was found as the positive hit...
April 2015: Yao Xue Xue Bao, Acta Pharmaceutica Sinica
Li Zhao, Yun Jiao, An-Ning Yang, Cheng-Jian Cao, Fan-Qi Kong, Xian-Mei Liu, Xiao-Ling Yang, Yi-Deng Jiang
The aim of the present study is to explore the role of miR-124 and its promoter region DNA methylation in homocysteine (Hcy)-induced atherosclerosis. ApoE(-/-) mice were fed with hypermethionine diet for 16 weeks to duplicate hyperhomocysteinemia model. Meanwhile, a normal control group (C57BL/6J mice fed with normal diet, N-control) and a model control group (ApoE(-/-) mice fed with normal diet, A-control) were set. The degree of atherosclerosis was observed by HE and oil red O staining. Automatic biochemical analyzer was used to detect the serum levels of Hcy...
April 25, 2015: Sheng Li Xue Bao: [Acta Physiologica Sinica]
Siroon Bekkering, Leo A B Joosten, Jos W M van der Meer, Mihai G Netea, Niels P Riksen
PURPOSE: Atherosclerosis is characterized by a persistent inflammation of the arterial wall. Monocyte-derived macrophages are the most abundant immune cells in atherosclerotic plaques. After stimulation, monocytes can adopt a long-term proinflammatory phenotype. This nonspecific memory of innate immune cells is mediated by epigenetic reprogramming and has recently been termed "trained innate immunity." The goal of this study was to describe the potential role of trained immunity in the development of atherosclerosis and to discuss the potential clinical implications of this concept...
April 1, 2015: Clinical Therapeutics
Monika Smiga-Matuszowicz, Bartosz Janicki, Katarzyna Jaszcz, Jan Łukaszczyk, Marcin Kaczmarek, Marta Lesiak, Aleksander L Sieroń, Wojciech Simka, Maciej Mierzwiński, Damian Kusz
In this study new biodegradable materials obtained by crosslinking poly(3-allyloxy-1,2-propylene succinate) (PSAGE) with oligo(isosorbide maleate) (OMIS) and small amount of methyl methacrylate were investigated. The porous scaffolds were obtained in the presence of a foaming system consisted of calcium carbonate/carboxylic acid mixture, creating in situ porous structure during crosslinking of liquid formulations. The maximum crosslinking temperature and setting time, the cured porous materials morphology as well as the effect of their porosity on mechanical properties and hydrolytic degradation process were evaluated...
December 2014: Materials Science & Engineering. C, Materials for Biological Applications
Yong-Zhen Gong, Shao-Wei Sun, Hao-Yu Yuan, Xue-Jiao Xie, Qin-Hui Tuo, Xue-Feng Yang, Xi Tan, Xi-Long Zheng, Yan Xiong, Duan-Fang Liao
BACKGROUND: Ezetimibe is a potent inhibitor of Niemann-Pick type C1-Like 1 and has been approved for the treatment of hypercholesterolemia. Our preliminary study showed that ezetimibe promotes cholesterol efflux from vascular smooth muscle cells (VSMCs). Our aim was to investigate the cellular mechanisms underlying the ezetimibe actions. METHODS AND RESULTS: Rat VSMCs were converted to foam cells by incubation with cholesterol:methyl-β-cyclodextrin. The intracellular free cholesterol, total cholesterol, and the ratio of cholesteryl ester to total cholesterol were decreased after the incubation of VSMCs with different concentrations of ezetimibe (3, 10, 30, and 30 μmol/l) or treated with 30 μmol/l of ezetimibe for different time periods (6, 12, 24, and 48 h)...
2014: Pharmacology
David P Overy, Fabrice Berrue, Hebelin Correa, Novriyandi Hanif, Kathryn Hay, Martin Lanteigne, Kathrine Mquilian, Stephanie Duffy, Patricia Boland, Ramesh Jagannathan, Gavin S Carr, Marieke Vansteeland, Russell G Kerr
Due to a rate increase in the resistance of microbial pathogens to currently used antibiotics, there is a need in society for the discovery of novel antimicrobials. Historically, fungi are a proven source for antimicrobial compounds. The main goals of this study were to investigate the fungal diversity associated with sea foam collected around the coast of Prince Edward Island and the utility of this resource for the production of antimicrobial natural products. Obtained isolates were identified using ITS and nLSU rDNA sequences, fermented on four media, extracted and fractions enriched in secondary metabolites were screened for antimicrobial activity...
July 3, 2014: Mycology
Masateru Ono, Shin Yasuda, Haruki Komatsu, Yukio Fujiwara, Motohiro Takeya, Toshihiro Nohara
From the methanol extract of the fruits of the blackberry (Rubus allegheniensis Port.), four triterpenoids - pomolic acid (1), tormentic acid (2), euscaphic acid (3) and 1β-hydroxyeuscaphic acid (4) - were isolated, while six triterpenoids - 2, 3, myrianthic acid (5), ziyu glycoside II (6), sericic acid (7) and 19-hydroxy-2,3-secours-12-ene-2,3,28-trioic acid 3-methyl ester (8) - were obtained from the methanol extract of the leaves of this plant. Their structures were determined on the basis of spectral data...
2014: Natural Product Research
Siroon Bekkering, Jessica Quintin, Leo A B Joosten, Jos W M van der Meer, Mihai G Netea, Niels P Riksen
OBJECTIVE: Although the role of monocytes in the pathogenesis of atherosclerosis is well established, the persistent vascular inflammation remains largely unexplained. Recently, our group reported that stimulation of monocytes with various microbial products can induce a long-lasting proinflammatory phenotype via epigenetic reprogramming, a process termed trained immunity. We now hypothesize that oxidized low-density lipoprotein (oxLDL) also induces a long-lasting proinflammatory phenotype in monocytes, which accelerates atherosclerosis by proinflammatory cytokine production and foam cell formation...
August 2014: Arteriosclerosis, Thrombosis, and Vascular Biology
Chao Zhou, Han Lei, Yaxi Chen, Qing Liu, Lung-Chih Li, John F Moorhead, Zac Varghese, Xiong Z Ruan
Inflammatory stress promotes foam cell formation by disrupting LDL receptor feedback regulation in macrophages. Sterol Regulatory Element Binding Proteins (SREBPs) Cleavage-Activating Protein (SCAP) glycosylation plays crucial roles in regulating LDL receptor and 3-hydroxy-3-methyl-glutaryl-CoA reductase (HMGCoAR) feedback regulation. The present study was to investigate if inflammatory stress disrupts LDL receptor and HMGCoAR feedback regulation by affecting SCAP glycosylation in THP-1 macrophages. Intracellular cholesterol content was assessed by Oil Red O staining and quantitative assay...
2013: PloS One
Liane I F Moura, Ana M A Dias, Ermelindo C Leal, Lina Carvalho, Hermínio C de Sousa, Eugénia Carvalho
One important complication of diabetes mellitus is chronic, non-healing diabetic foot ulcers (DFUs). This study aims to develop and use dressings based on chitosan derivatives for the sustained delivery of neurotensin (NT), a neuropeptide that acts as an inflammatory modulator in wound healing. Three different derivatives, namely N-carboxymethyl chitosan, 5-methyl pyrrolidinone chitosan (MPC) and N-succinyl chitosan, are presented as potential biomaterials for wound healing applications. Our results show that MPC has the best fluid handling capacity and delivery profile, also being non-toxic to Raw 264...
February 2014: Acta Biomaterialia
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