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https://www.readbyqxmd.com/read/28431321/atherogenicity-of-amino-acids-in-the-lipid-laden-macrophage-model-system-in-vitro-and-in-atherosclerotic-mice-a-key-role-for-triglyceride-metabolism
#1
Oren Rom, Claudia Grajeda-Iglesias, Mahmoud Najjar, Niroz Abu-Saleh, Nina Volkova, Dalit Esther Dar, Tony Hayek, Michael Aviram
Atherosclerosis-related research has focused mainly on the effects of lipids on macrophage foam cell formation and atherogenesis, whereas the role of amino acids (AAs) was understudied. The current study aimed to identify anti- or pro-atherogenic AA in the macrophage model system and to elucidate the underlying metabolic and molecular mechanisms. J774A.1 cultured macrophages were treated with increasing concentrations of each 1 of the 20 AAs. Macrophage atherogenicity was assessed in terms of cellular toxicity, generation of reactive oxygen species (ROS) and cellular cholesterol or triglyceride content...
April 6, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28429001/structure-property-relationships-of-cell-clusters-in-biotissues-2d-analysis
#2
Xiaohua Zhou, Erhu Zhang, Minggang Xia, Lei Zhang, Zhiqi Tian, Jianlin Liu, Shengli Zhang
Gaining insight into the relationships between the self-organized cell structures and the properties of biotissues is helpful for revealing the function of biomaterials and its designing principle. However, the traditionally used random foam model neglects several important details of the frameworks of cell clusters resulting in incomplete conclusions. Herein, we use a more complete model, the cell adhesion model, to investigate the mechanical and morphological properties of the two-dimensional (2D) dry cell foams...
April 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28428482/triglyceride-rich-lipoprotein-lpl-vldl-receptor-and-lp-a-vldl-receptor-pathways-for-macrophage-foam-cell-formation
#3
Sadao Takahashi
Very low-density lipoprotein (VLDL) receptor is a member of the low-density lipoprotein (LDL) receptor family. It binds triglyceride rich lipoprotein (TGRL) but not LDL, because it recognizes apolipoprotein (apo)E only but not apoB. The VLDL receptor functions as a peripheral lipoprotein receptor in concert with lipoprotein lipase (LPL) in heart, muscle, adipose tissue and macrophages. In contrast to the LDL receptor, VLDL receptor binds apo E2/2 VLDL and apoE3/3 VLDL particles, and its expression is not down-regulated by intracellular lipoproteins...
April 19, 2017: Journal of Atherosclerosis and Thrombosis
https://www.readbyqxmd.com/read/28428217/microrna-33-regulates-macrophage-autophagy-in-atherosclerosis
#4
Mireille Ouimet, Hasini Ediriweera, Milessa Silva Afonso, Bhama Ramkhelawon, Ragunath Singaravelu, Xianghai Liao, Rachel C Bandler, Karishma Rahman, Edward A Fisher, Katey J Rayner, John P Pezacki, Ira Tabas, Kathryn J Moore
OBJECTIVE: Defective autophagy in macrophages leads to pathological processes that contribute to atherosclerosis, including impaired cholesterol metabolism and defective efferocytosis. Autophagy promotes the degradation of cytoplasmic components in lysosomes and plays a key role in the catabolism of stored lipids to maintain cellular homeostasis. microRNA-33 (miR-33) is a post-transcriptional regulator of genes involved in cholesterol homeostasis, yet the complete mechanisms by which miR-33 controls lipid metabolism are unknown...
April 20, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28424539/%C3%AE-3-adrenoceptor-activation-upregulates-apolipoprotein-a-i-expression-in-hepg2-cells-which-might-further-promote-cholesterol-efflux-from-macrophage-foam-cells
#5
Xia-Qing Gao, Yan-Fang Li, Zhi-Li Jiang
OBJECTIVE: The aim of this study was to explore the effects of β3-adrenoceptor (β3-AR) activation on HepG2 cells and its influence on cholesterol efflux from macrophage foam cells. MATERIALS AND METHODS: HepG2 cells were cultured and treated with the β3-AR agonist, BRL37344, and antagonist, SR52390A, and the expression of apolipoprotein (Apo) A-I, ApoA-II, ApoB, and β3-AR in the supernatants and cells was determined. The expression of peroxisome proliferator-activated receptor (PPAR) γ and PPARα in the HepG2 cells was also assessed...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28423914/current-views-on-neuropeptide-y-and-diabetes-related-atherosclerosis
#6
Wei-Wei Sun, Ping Zhu, Yan-Chuan Shi, Chen-Liang Zhang, Xu-Feng Huang, Shi-Yu Liang, Zhi-Yuan Song, Shu Lin
Diabetes-induced atherosclerotic cardiovascular disease is the leading cause of death of diabetic patients. Neuronal regulation plays a critical role in glucose metabolism and cardiovascular function under physiological and pathological conditions, among which, neurotransmitter neuropeptide Y has been shown to be closely involved in these two processes. Elevated central neuropeptide Y level promotes food intake and reduces energy expenditure, thereby increasing adiposity. Neuropeptide Y is co-localized with noradrenaline in central and sympathetic nervous systems...
April 1, 2017: Diabetes & Vascular Disease Research
https://www.readbyqxmd.com/read/28412733/prevention-of-tumor-seeding-during-needle-biopsy-by-chemotherapeutic-releasing-gelatin-sticks
#7
Ren-Yuan Bai, Verena Staedtke, Xuewei Xia, Gregory J Riggins
Needle biopsy is an indispensable diagnostic tool in obtaining tumor tissue for diagnostic examination. Tumor cell seeding in the needle track during percutaneous needle biopsies has been reported for various types of cancers. The mechanical force of the biopsy both directly displaces the malignant cells and causes bleeding and fluid movement that can further disseminate cells. To prevent the risk of tumor cell seeding during biopsy, we developed a gelatin stick loaded with chemotherapeutics such as doxorubicin (DXR) that was inserted into the biopsy canal...
February 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28412693/feeding-angptl4-mice-trans-fat-promotes-foam-cell-formation-in-mesenteric-lymph-nodes-without-leading-to-ascites
#8
Antwi Boasiako Oteng, Asmita Bhattacharya, Susanne Brodesser, Ling Qi, Nguan Soon Tan, Sander Kersten
ANGPTL4 regulates plasma triglyceride levels by inhibiting lipoprotein lipase. Inactivation of ANGPTL4 decreases plasma triglycerides and reduces risk of coronary artery disease. Unfortunately, targeting ANGPTL4 for the therapeutic management of dyslipidemia and atherosclerosis is hampered by the observation that mice and monkeys in which ANGPTL4 is inactivated exhibit lipid accumulation in mesenteric lymph nodes. In mice these pathological events exclusively unfold upon feeding a high saturated fatty acid diet and are followed by an ultimately lethal pro-inflammatory response and chylous ascites...
April 15, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28411538/formulation-of-crude-oil-spill-dispersants-based-on-the-hld-concept-and-using-a-lipopeptide-biosurfactant
#9
Witchaya Rongsayamanont, Suwat Soonglerdsongpha, Nichakorn Khondee, Onruthai Pinyakong, Chantra Tongcumpou, David A Sabatini, Ekawan Luepromchai
Solvent-free dispersants for crude oil spills were formulated based on the hydrophilic-lipophilic deviation (HLD) concept and using lipopeptides from Bacillus sp. GY19. The lipopeptides were recovered and concentrated from cell-free broth by foam fractionation and freeze-drying. They had good surface activity under varying temperatures, pH and NaCl levels. Moreover, the lipopeptides had low toxicity to copepods (LC50 1174mg/L) and whiteleg shrimp (LC50 1050mg/L). The characteristic curvature (Cc) of the lipopeptides showed that they were more hydrophobic (Cc 4...
April 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28411243/potent-vasoconstrictor-kisspeptin-10-induces-atherosclerotic-plaque-progression-and-instability-reversal-by-its-receptor-gpr54-antagonist
#10
Kengo Sato, Remina Shirai, Mina Hontani, Rina Shinooka, Akinori Hasegawa, Tomoki Kichise, Tomoyuki Yamashita, Hayami Yoshizawa, Rena Watanabe, Taka-Aki Matsuyama, Hatsue Ishibashi-Ueda, Shinji Koba, Youichi Kobayashi, Tsutomu Hirano, Takuya Watanabe
BACKGROUND: Kisspeptin-10 (KP-10), a potent vasoconstrictor and inhibitor of angiogenesis, and its receptor, GPR54, have currently received much attention in relation to pre-eclampsia. However, it still remains unknown whether KP-10 could affect atherogenesis. METHODS AND RESULTS: We evaluated the effects of KP-10 on human umbilical vein endothelial cells, human monocyte-derived macrophages, human aortic smooth muscle cells in vitro, and atherosclerotic lesions in apolipoprotein E-deficient (ApoE(-/-)) mice in vivo...
April 14, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28408925/combination-therapy-with-a-sodium-glucose-cotransporter-2-inhibitor-and-a-dipeptidyl-peptidase-4-inhibitor-additively-suppresses-macrophage-foam-cell-formation-and-atherosclerosis-in-diabetic-mice
#11
Michishige Terasaki, Munenori Hiromura, Yusaku Mori, Kyoko Kohashi, Hideki Kushima, Makoto Ohara, Takuya Watanabe, Olov Andersson, Tsutomu Hirano
Dipeptidyl peptidase-4 inhibitors (DPP-4is), in addition to their antihyperglycemic roles, have antiatherosclerotic effects. We reported that sodium-glucose cotransporter 2 inhibitors (SGLT2is) suppress atherosclerosis in a glucose-dependent manner in diabetic mice. Here, we investigated the effects of combination therapy with SGLT2i and DPP-4i on atherosclerosis in diabetic mice. SGLT2i (ipragliflozin, 1.0 mg/kg/day) and DPP-4i (alogliptin, 8.0 mg/kg/day), either alone or in combination, were administered to db/db mice or streptozotocin-induced diabetic apolipoprotein E-null (Apoe(-/-) ) mice...
2017: International Journal of Endocrinology
https://www.readbyqxmd.com/read/28408096/local-treatment-of-a-pharyngocutaneous-fistula-secondary-to-osteoradionecrosis
#12
Olga González-Antolín
Radionecrosis is a late, and difficult to treat,complication of radiotherapy performed on head and neck tumours, and it is difficult to treat. This process causes significant damage, not only in the skin, but also in muscular, nervous, vascular, and bone structures. This, in turn, leads to airway and digestive tract involvement, as well as a functional loss and a cosmetic defect that usually requires reconstructive surgery. Therefore, this process is associated with a significant loss in the quality of life of patients and involves a long hospital stay for treatment, as well as the necessary support measures...
April 10, 2017: Enfermería Clínica
https://www.readbyqxmd.com/read/28406244/cortistatin-reduces-atherosclerosis-in-hyperlipidemic-apoe-deficient-mice-and-the-formation-of-foam-cells
#13
Virginia Delgado-Maroto, Raquel Benitez, Irene Forte-Lago, Maria Morell, Elena Maganto-Garcia, Luciana Souza-Moreira, Francisco O'Valle, Mario Duran-Prado, Andrew H Lichtman, Elena Gonzalez-Rey, Mario Delgado
Atherosclerosis is a chronic inflammatory cardiovascular disease that is responsible of high mortality worldwide. Evidence indicates that maladaptive autoimmune responses in the arterial wall play critical roles in the process of atherosclerosis. Cortistatin is a neuropeptide expressed in the vascular system and atherosclerotic plaques that regulates vascular calcification and neointimal formation, and inhibits inflammation in different experimental models of autoimmune diseases. Its role in inflammatory cardiovascular disorders is largely unexplored...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28404639/cholesterol-crystallization-within-hepatocyte-lipid-droplets-and-its-role-in-murine-nash
#14
George N Ioannou, Savitha Subramanian, Alan Chait, W Geoffrey Haigh, Matthew M Yeh, Geoffrey C Farrell, Sum P Lee, Christopher Savard
We recently reported that cholesterol crystals form in hepatocyte lipid droplets (LDs) in human and experimental NASH. Herein, we assigned wild-type C57BL/6J mice to a high-fat (15%) diet for 6 months supplemented with 0%, 0.25%, 0.5%, 0.75%, or 1% dietary cholesterol. Increasing dietary cholesterol led to cholesterol loading of the liver, but not adipose tissue, resulting in fibrosing steatohepatitis at a dietary cholesterol concentration ≥0.5%, whereas mice on lower cholesterol diets developed only simple steatosis...
April 12, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28391876/lipoprotein-x-in-cholestatic-patients-causes-xanthomas-and-promotes-foam-cell-formation-in-human-macrophages
#15
Luka Suzuki, Satoshi Hirayama, Mariko Fukui, Makoto Sasaki, Sadayuki Hiroi, Makoto Ayaori, Shuji Terai, Minoru Tozuka, Hirotaka Watada, Takashi Miida
BACKGROUND: Lipoprotein-X (Lp-X) is an abnormal phospholipid-rich lipoprotein found in patients with cholestatic liver disease. Some patients exhibit skin xanthomas and severe hyperlipidemia. OBJECTIVE: We investigated whether Lp-X induces foam cell formation in human-derived macrophages. METHODS: To compare the atherogenic properties of Lp-X and modified LDL, we isolated Lp-X from 2 patients who had drug-induced cholestasis and xanthoma striata in the interphalangeal folds...
January 2017: Journal of Clinical Lipidology
https://www.readbyqxmd.com/read/28390787/biodegradation-and-kinetic-study-of-benzene-in-bioreactor-packed-with-puf-and-alginate-beads-and-immobilized-with-bacillus-sp-m3
#16
M K Kureel, S R Geed, B S Giri, B N Rai, R S Singh
Benzene removal in free and immobilized cells on polyurethane foam (PUF) and polyvinyl alcohol (PVA)-alginate beads was studied using an indigenous soil bacterium Bacillus sp. M3 isolated from petroleum-contaminated soil. The important process parameters (pH, temperature and inoculums size) were optimized and found to be 7, 37°C and 6.0×10(8)CFU/mL, respectively. Benzene removals were observed to be 70, 84 and 90% within 9days in a free cell, immobilized PVA-alginate beads and PUF, respectively under optimum operating conditions...
March 30, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28384359/a-mechanistic-model-for-atherosclerosis-and-its-application-to-the-cohort-of-mayak-workers
#17
Cristoforo Simonetto, Tamara V Azizova, Zarko Barjaktarovic, Johann Bauersachs, Peter Jacob, Jan Christian Kaiser, Reinhard Meckbach, Helmut Schöllnberger, Markus Eidemüller
We propose a stochastic model for use in epidemiological analysis, describing the age-dependent development of atherosclerosis with adequate simplification. The model features the uptake of monocytes into the arterial wall, their proliferation and transition into foam cells. The number of foam cells is assumed to determine the health risk for clinically relevant events such as stroke. In a simulation study, the model was checked against the age-dependent prevalence of atherosclerotic lesions. Next, the model was applied to incidence of atherosclerotic stroke in the cohort of male workers from the Mayak nuclear facility in the Southern Urals...
2017: PloS One
https://www.readbyqxmd.com/read/28374780/inhibition-of-epidermal-growth-factor-receptor-attenuates-atherosclerosis-via-decreasing-inflammation-and-oxidative-stress
#18
Lintao Wang, Zhouqing Huang, Weijian Huang, Xuemei Chen, Peiren Shan, Peng Zhong, Zia Khan, Jingying Wang, Qilu Fang, Guang Liang, Yi Wang
Atherosclerosis is a progressive disease leading to loss of vascular homeostasis and entails fibrosis, macrophage foam cell formation, and smooth muscle cell proliferation. Recent studies have reported that epidermal growth factor receptor (EGFR) is involved vascular pathophysiology and in the regulation of oxidative stress in macrophages. Although, oxidative stress and inflammation play a critical role in the development of atherosclerosis, the underlying mechanisms are complex and not completely understood...
April 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28367625/epigallocatechin-3-gallate-reduces-scavenger-receptor-a-expression-and-foam-cell-formation-in-human-macrophages
#19
Sy-Jou Chen, Yung-Hsi Kao, Li Jing, Yi-Ping Chuang, Wan-Lin Wu, Shu-Ting Liu, Shih-Ming Huang, Jenn-Haung Lai, Ling-Jun Ho, Min-Chien Tsai, Chin-Sheng Lin
Foam cells are formed when macrophages imbibe low-density lipoprotein (LDL) through scavenger receptors. Here we examined how epigallocatechin-3-gallate (EGCG) influences foam cell formation. We found that EGCG dose-dependently reduced oxidized LDL (oxLDL) uptake in THP-1 (10 μM, 20.0 ± 0.50, p < 0.05) and primary macrophages (134.6 ± 15.6, p < 0.05) and reduced intracellular cholesterol content in these cells, respectively (10 μM, 32.6 ± 0.14, p < 0.05; 31.7 ± 1.26, p < 0.05). EGCG treatment decreased scavenger receptor A expression, but not the expression of CD36 or of reverse cholesterol transporters...
April 10, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28365854/inhibitory-effects-of-dioscin-on-atherosclerosis-and-foam-cell-formation-in-hyperlipidemia-rats
#20
Ping Wang, Li-Ya He, Guo-Dong Shen, Rui-Lin Li, Jun-Li Yang
Macrophage-derived foam cells are well known for their key role in development of atherosclerosis (AS). The present study aimed to examine whether dioscin exerts anti-atherosclerotic activity and inhibits foam cell formation. A high-fat induced AS model and ox-LDL treated macrophages were established and received treatment of dioscin. Anti-atherosclerotic activity in vivo was assessed by atherosclerotic lesions size and aortic lipid contents. Macrophage formed foam cells were positively identified by oil red o staining...
April 1, 2017: Inflammopharmacology
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