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https://www.readbyqxmd.com/read/28629534/heparin-derived-oligosaccharide-inhibits-vascular-intimal-hyperplasia-in-balloon-injured-carotid-artery
#1
Jie-Ru Liu, Jie Wu, Xin-Chao Yu, Xuan Qian, Rui Xiong, Hui-Fang Wang, Dan-Feng Yu, Fei-Fei Liu, Shu-Ying He
The aims of the present study were to determine the effects of heparin-derived oligosaccharides (HDOs) on vascular intimal hyperplasia (IH) in balloon-injured carotid artery and to elucidate the underlying mechanisms of action. An animal model was established by rubbing the endothelia within the common carotid artery (CCA) in male rabbits. The rabbits were fed a high-cholesterol diet. Arterial IH was determined by histopathological changes to the CCA. Serum lipids were detected using an automated biochemical analysis...
June 2017: Chinese Journal of Natural Medicines
https://www.readbyqxmd.com/read/28611100/ampk-activation-enhances-the-anti-atherogenic-effects-of-high-density-lipoproteins-in-apoe-mice
#2
Ang Ma, Jing Wang, Liu Yang, Yuanyuan An, Haibo Zhu
HDL plays crucial roles at multiple stages of the pathogenesis of atherosclerosis. AMP-activated protein kinase (AMPK) is a therapeutic candidate for the treatment of cardiovascular disease. However, the effect of AMPK activation on HDL functionality has not been established in vivo. We assessed the effects of pharmacological AMPK activation using A-769662, AICAR, metformin, and IMM-H007 on the atheroprotective functions of HDL in apoE-deficient (apoE-/-) mice fed with a high fat diet. After administration, although there no changes in serum lipid levels among the groups...
June 13, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28552715/influence-of-scarb1-gene-snps-on-serum-lipid-levels-and-susceptibility-to-coronary-heart-disease-and-cerebral-infarction-in-a-chinese-population
#3
Ting-Ting Zeng, Di-Jiao Tang, Yuan-Xin Ye, Jun Su, Hong Jiang
The SCARB1 gene encodes human scavenger receptor class B type I (SR-BI), the primary receptor for high-density lipoprotein (HDL)- cholesteryl ester uptake, and polymorphisms in this gene may influence SR-BI protein expression and serum lipid levels, modulating susceptibility to coronary heart disease (CHD) and cerebral infarction (CI). Therefore, we investigated the association between singlenucleotide polymorphisms (SNPs) in the SCARB1 gene and serum lipid levels as well as risk of CHD and CI in the Chinese Han population...
May 24, 2017: Gene
https://www.readbyqxmd.com/read/28549616/pectin-penta-oligogalacturonide-reduces-cholesterol-accumulation-by-promoting-bile-acid-biosynthesis-and-excretion-in-high-cholesterol-fed-mice
#4
Ru-Gang Zhu, Yan-Di Sun, Yu-Ting Hou, Jun-Gang Fan, Gang Chen, Tuo-Ping Li
Haw pectin penta-oligogalacturonide (HPPS) has important role in improving cholesterol metabolism and promoting the conversion of cholesterol to bile acids (BA) in mice fed high-cholesterol diet (HCD). However, the mechanism is not clear. This study aims to investigate the effects of HPPS on cholesterol accumulation and the regulation of hepatic BA synthesis and transport in HCD-fed mice. Results showed that HPPS significantly decreased plasma and hepatic TC levels but increased plasma high-density lipoprotein cholesterol (HDL-C) and apolipoprotein A-I (apoA-I) levels, compared to HCD...
June 25, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28506360/plasmodium-p36-determines-host-cell-receptor-usage-during-sporozoite-invasion
#5
Giulia Manzoni, Carine Marinach, Selma Topçu, Sylvie Briquet, Morgane Grand, Matthieu Tolle, Marion Gransagne, Julien Lescar, Chiara Andolina, Jean-François Franetich, Mirjam B Zeisel, Thierry Huby, Eric Rubinstein, Georges Snounou, Dominique Mazier, François Nosten, Thomas F Baumert, Olivier Silvie
Plasmodium sporozoites, the mosquito-transmitted forms of the malaria parasite, first infect the liver for an initial round of replication before the emergence of pathogenic blood stages. Sporozoites represent attractive targets for antimalarial preventive strategies, yet the mechanisms of parasite entry into hepatocytes remain poorly understood. Here we show that the two main species causing malaria in humans, Plasmodium falciparum and Plasmodium vivax, rely on two distinct host cell surface proteins, CD81 and the Scavenger Receptor BI (SR-BI), respectively, to infect hepatocytes...
May 16, 2017: ELife
https://www.readbyqxmd.com/read/28486435/regulated-entry-of-hepatitis-c-virus-into-hepatocytes
#6
REVIEW
Zhijiang Miao, Zhenrong Xie, Jing Miao, Jieyu Ran, Yue Feng, Xueshan Xia
Hepatitis C virus (HCV) is a model for the study of virus-host interaction and host cell responses to infection. Virus entry into hepatocytes is the first step in the HCV life cycle, and this process requires multiple receptors working together. The scavenger receptor class B type I (SR-BI) and claudin-1 (CLDN1), together with human cluster of differentiation (CD) 81 and occludin (OCLN), constitute the minimal set of HCV entry receptors. Nevertheless, HCV entry is a complex process involving multiple host signaling pathways that form a systematic regulatory network; this network is centrally controlled by upstream regulators epidermal growth factor receptor (EGFR) and transforming growth factor β receptor (TGFβ-R)...
May 9, 2017: Viruses
https://www.readbyqxmd.com/read/28434931/effect-of-size-and-pegylation-of-liposomes-and-peptide-based-synthetic-lipoproteins-on-tumor-targeting
#7
Jie Tang, Rui Kuai, Wenmin Yuan, Lindsey Drake, James J Moon, Anna Schwendeman
Synthetic high-density lipoprotein nanoparticles (sHDL) are a valuable class of nanomedicines with established animal safety profile, clinical tolerability and therapeutic efficacy for cardiovascular applications. In this study we examined how the scavenger receptor B-I-mediated (SR-BI) tumor-targeting ability of sHDL, long plasma circulation half-life, and small particle size (9.6±0.2nm) impacted sHDL accumulation in SR-BI positive colorectal carcinoma cells, 3D tumor spheroids, and in vivo xenografts. We compared tumor accumulation of sHDL with that of liposomes (LIP, 130...
April 18, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28423002/human-sr-bii-mediates-saa-uptake-and-contributes-to-saa-pro-inflammatory-signaling-in-vitro-and-in-vivo
#8
Irina N Baranova, Ana C P Souza, Alexander V Bocharov, Tatyana G Vishnyakova, Xuzhen Hu, Boris L Vaisman, Marcelo J Amar, Zhigang Chen, Alan T Remaley, Amy P Patterson, Peter S T Yuen, Robert A Star, Thomas L Eggerman
Serum amyloid A (SAA) is an acute phase protein with cytokine-like and chemotactic properties, that is markedly up-regulated during various inflammatory conditions. Several receptors, including FPRL-1, TLR2, TLR4, RAGE, class B scavenger receptors, SR-BI and CD36, have been identified as SAA receptors. This study provides new evidence that SR-BII, splice variant of SR-BI, could function as an SAA receptor mediating its uptake and pro-inflammatory signaling. The uptake of Alexa Fluor488 SAA was markedly (~3 fold) increased in hSR-BII-expressing HeLa cells when compared with mock-transfected cells...
2017: PloS One
https://www.readbyqxmd.com/read/28420704/influence-of-hdl-particles-on-cell-cholesterol-efflux-under-various-pathological-conditions
#9
Bela F Asztalos, Katalin V Horvath, Michael Mehan, Yuya Yokota, Ernst J Schaefer
It has been reported that low cell-cholesterol efflux capacity (CEC) of HDL is an independent risk factor for CVD. To better understand CEC regulation, we measured ABCA1- and scavenger receptor class B type I (SR-BI)-dependent cell-cholesterol efflux, HDL anti-oxidative capacity, HDL particles, lipids, and inflammatory- and oxidative-stress markers in 122 subjects with elevated plasma levels of triglyceride (TG), serum amyloid A (SAA), fibrinogen, myeloperoxidase (MPO), or β-sitosterol and in 146 controls...
June 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28404852/attachment-and-post-attachment-receptors-important-for-hepatitis-c-virus-infection-and-cell-to-cell-transmission
#10
Huahao Fan, Luhua Qiao, Kyung-Don Kang, Junfen Fan, Wensheng Wei, Guangxiang Luo
Hepatitis C virus (HCV) infection requires multiple receptors for its attachment and entry to the cell. Our previous studies found that human syndecan-1 (SDC-1), SDC-2, and T cell immunoglobulin and mucin domain-containing protein 1 (TIM-1) are HCV attachment receptors. Other cell surface molecules such as CD81, CLDN1, OCLN, SR-BI, and LDLR mainly function at post-attachment steps, which are considered post-attachment receptors. The underlying molecular mechanisms of different receptors in HCV cell-free and cell-to-cell transmission remain elusive...
April 12, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28363797/scavenger-receptor-class-b-member-1-scarb1-variants-modulate-hepatitis-c-virus-replication-cycle-and-viral-load
#11
Sandra Westhaus, Maximilian Deest, Anna T X Nguyen, Frauke Stanke, Dirk Heckl, Rui Costa, Axel Schambach, Michael P Manns, Thomas Berg, Florian W R Vondran, Christoph Sarrazin, Sandra Ciesek, Thomas von Hahn
BACKGROUND & AIMS: Numerous coding and non-coding variants exist in the SCARB1 gene that encodes SR-BI, a key receptor for both high density lipoproteins and HCV. Many have been linked to clinically apparent phenotypes, yet their impact on the HCV replication cycle is incompletely understood. METHODS: We analyzed key coding non-synonymous as well as non-coding SCARB1 variants using virological in vitro and human genetics approaches. RESULTS: Among the non-synonymous variants investigated we found that S112F and T175A have greatly reduced HCV receptor function...
March 28, 2017: Journal of Hepatology
https://www.readbyqxmd.com/read/28360088/vegf-a-regulates-cellular-localization-of-sr-bi-as-well-as-transendothelial-transport-of-hdl-but-not-ldl
#12
Srividya Velagapudi, Mustafa Yalcinkaya, Antonio Piemontese, Roger Meier, Simon Flyvbjerg Nørrelykke, Damir Perisa, Andrzej Rzepiela, Michael Stebler, Szymon Stoma, Paolo Zanoni, Lucia Rohrer, Arnold von Eckardstein
OBJECTIVE: Low- and high-density lipoproteins (LDL and HDL) must pass the endothelial layer to exert pro- and antiatherogenic activities, respectively, within the vascular wall. However, the rate-limiting factors that mediate transendothelial transport of lipoproteins are yet little known. Therefore, we performed a high-throughput screen with kinase drug inhibitors to identify modulators of transendothelial LDL and HDL transport. APPROACH AND RESULTS: Microscopy-based high-content screening was performed by incubating human aortic endothelial cells with 141 kinase-inhibiting drugs and fluorescent-labeled LDL or HDL...
May 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28315462/implications-of-cerebrovascular-atp-binding-cassette-transporter-g1-abcg1-and-apolipoprotein-m-in-cholesterol-transport-at-the-blood-brain-barrier
#13
Alexandra Carmen Kober, Anil Paul Chirackal Manavalan, Carmen Tam-Amersdorfer, Andreas Holmér, Ahmed Saeed, Elham Fanaee-Danesh, Martina Zandl, Nicole Maria Albrecher, Ingemar Björkhem, Gerhard M Kostner, Björn Dahlbäck, Ute Panzenboeck
Impaired cholesterol/lipoprotein metabolism is linked to neurodegenerative diseases such as Alzheimer's disease (AD). Cerebral cholesterol homeostasis is maintained by the highly efficient blood-brain barrier (BBB) and flux of the oxysterols 24(S)-hydroxycholesterol and 27-hydroxycholesterol, potent liver-X-receptor (LXR) activators. HDL and their apolipoproteins are crucial for cerebral lipid transfer, and loss of ATP binding cassette transporters (ABC)G1 and G4 results in toxic accumulation of oxysterols in the brain...
March 14, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28301373/rediscovering-scavenger-receptor-type-bi-surprising-new-roles-for-the-hdl-receptor
#14
Menno Hoekstra, Mary Sorci-Thomas
PURPOSE OF REVIEW: Scavenger receptor BI (SR-BI) is classically known for its role in antiatherogenic reverse cholesterol transport as it selectively takes up cholesterol esters from HDL. Here, we have highlighted recent literature that describes novel functions for SR-BI in physiology and disease. RECENT FINDINGS: A large population-based study has revealed that patients heterozygous for the P376L mutant form of SR-BI showed significantly increased levels of plasma HDL-cholesterol and had increased risk of cardiovascular disease, demonstrating that SR-BI in humans is a significant determinant of cardiovascular disease...
June 2017: Current Opinion in Lipidology
https://www.readbyqxmd.com/read/28259375/sr-bi-a-multifunctional-receptor-in-cholesterol-homeostasis-and-atherosclerosis
#15
REVIEW
MacRae F Linton, Huan Tao, Edward F Linton, Patricia G Yancey
The HDL receptor scavenger receptor class B type I (SR-BI) plays crucial roles in cholesterol homeostasis, lipoprotein metabolism, and atherosclerosis. Hepatic SR-BI mediates reverse cholesterol transport (RCT) by the uptake of HDL cholesterol for routing to the bile. Through the selective uptake of HDL lipids, hepatic SR-BI modulates HDL composition and preserves HDL's atheroprotective functions of mediating cholesterol efflux and minimizing inflammation and oxidation. Macrophage and endothelial cell SR-BI inhibits the development of atherosclerosis by mediating cholesterol trafficking to minimize atherosclerotic lesion foam cell formation...
June 2017: Trends in Endocrinology and Metabolism: TEM
https://www.readbyqxmd.com/read/28181168/apoa-i-sr-bi-modulates-s1p-s1pr2-mediated-inflammation-through-the-pi3k-akt-signaling-pathway-in-huvecs
#16
Kun Ren, Yan-Ju Lu, Zhong-Cheng Mo, Xing -Liu, Zhen-Li Tang, Yue Jiang, Xiao-Shan Peng, Li Li, Qing-Hai Zhang, Guang-Hui Yi
Endothelial dysfunction plays a vital role during the initial stage of atherosclerosis. Oxidized low-density lipoprotein (ox-LDL) induces vascular endothelial injury and vessel wall inflammation. Sphingosine-1-phosphate (S1P) exerts numerous vasoprotective effects by binding to diverse S1P receptors (S1PRs; S1PR1-5). A number of studies have shown that in endothelial cells (ECs), S1PR2 acts as a pro-atherosclerotic mediator by stimulating vessel wall inflammation through the phosphatidylinositol 3-kinase (PI3K)/Akt signaling pathway...
February 8, 2017: Journal of Physiology and Biochemistry
https://www.readbyqxmd.com/read/28162952/nmr-structure-of-the-c-terminal-transmembrane-domain-of-the-hdl-receptor-sr-bi-and-a-functionally-relevant-leucine-zipper-motif
#17
Alexandra C Chadwick, Davin R Jensen, Paul J Hanson, Philip T Lange, Sarah C Proudfoot, Francis C Peterson, Brian F Volkman, Daisy Sahoo
The interaction of high-density lipoprotein (HDL) with its receptor, scavenger receptor BI (SR-BI), is critical for lowering plasma cholesterol levels and reducing the risk for cardiovascular disease. The HDL/SR-BI complex facilitates delivery of cholesterol into cells and is likely mediated by receptor dimerization. This work describes the use of nuclear magnetic resonance (NMR) spectroscopy to generate the first high-resolution structure of the C-terminal transmembrane domain of SR-BI. This region of SR-BI harbors a leucine zipper dimerization motif, which when mutated impairs the ability of the receptor to bind HDL and mediate cholesterol delivery...
March 7, 2017: Structure
https://www.readbyqxmd.com/read/28162236/sr-bi-as-target-in-atherosclerosis-and-cardiovascular-disease-a-comprehensive-appraisal-of-the-cellular-functions-of-sr-bi-in-physiology-and-disease
#18
REVIEW
Menno Hoekstra
High-density lipoprotein (HDL) is considered an anti-atherogenic lipoprotein species due to its role in reverse cholesterol transport. HDL delivers cholesterol esters to the liver through selective uptake by scavenger receptor class B type I (SR-BI). In line with the protective role for HDL in the context of cardiovascular disease, studies in mice and recently also in humans have shown that a disruption of normal SR-BI function predisposes subjects to the development of atherosclerotic lesions and cardiovascular disease...
March 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28148911/high-density-lipoprotein-hdl-particles-from-end-stage-renal-disease-patients-are-defective-in-promoting-reverse-cholesterol-transport
#19
Josephine L C Anderson, Thomas Gautier, Niels Nijstad, Markus Tölle, Mirjam Schuchardt, Markus van der Giet, Uwe J F Tietge
Atherosclerotic cardiovascular disease (CVD) represents the largest cause of mortality in end-stage renal disease (ESRD). CVD in ESRD is not explained by classical CVD risk factors such as HDL cholesterol mass levels making functional alterations of lipoproteins conceivable. HDL functions in atheroprotection by promoting reverse cholesterol transport (RCT), comprising cholesterol efflux from macrophage foam cells, uptake into hepatocytes and final excretion into the feces. ESRD-HDL (n = 15) were compared to healthy control HDL (n = 15) for their capacity to promote in vitro (i) cholesterol efflux from THP-1 macrophage foam cells and (ii) SR-BI-mediated selective uptake into ldla[SR-BI] cells as well as (iii) in vivo RCT...
February 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28105139/baicalin-promotes-cholesterol-efflux-by-regulating-the-expression-of-sr-bi-in-macrophages
#20
Renchao Yu, Yuexia Lv, Juanling Wang, Nana Pan, Rui Zhang, Xiaxia Wang, Haichu Yu, Lijuan Tan, Yunhe Zhao, Bo Li
Intake of a high dosage of baicalin has previously been shown to attenuate hyperlipidemia induced by a high-fat diet. Baicalin functions as an activator of peroxisome proliferator-activated receptor-γ (PPAR-γ), which is the key regulator of reverse cholesterol transport (RCT). The present study aimed to test the hypothesis that baicalin could promote cholesterol efflux in macrophages through activating PPAR-γ. Phorbol 12-myristate 13-acetate-stimulated THP-1 cells were treated with oxidized low-density lipoprotein and ((3)H)-cholesterol for 24 h, and the effects of baicalin on cholesterol efflux were evaluated in the presence of apolipoprotein A-1 (ApoA-1), or high-density lipoprotein subfraction 2 (HDL2) or subfraction 3 (HDL3)...
December 2016: Experimental and Therapeutic Medicine
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