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Lipid raft

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https://www.readbyqxmd.com/read/29225604/transcriptional-regulation-of-t-cell-lipid-metabolism-implications-for-plasma-membrane-lipid-rafts-and-t-cell-function
#1
REVIEW
George A Robinson, Kirsty E Waddington, Ines Pineda-Torra, Elizabeth C Jury
It is well established that cholesterol and glycosphingolipids are enriched in the plasma membrane (PM) and form signaling platforms called lipid rafts, essential for T-cell activation and function. Moreover, changes in PM lipid composition affect the biophysical properties of lipid rafts and have a role in defining functional T-cell phenotypes. Here, we review the role of transcriptional regulators of lipid metabolism including liver X receptors α/β, peroxisome proliferator-activated receptor γ, estrogen receptors α/β (ERα/β), and sterol regulatory element-binding proteins in T-cells...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29217618/lps-upregulates-palmitoylated-enzymes-of-the-phosphatidylinositol-cycle-an-insight-from-proteomic-studies
#2
Justyna Sobocińska, Paula Roszczenko-Jasińska, Monika Zaręba-Kozioł, Aneta Hromada-Judycka, Orest V Matveichuk, Gabriela Traczyk, Katarzyna Łukasiuk, Katarzyna Kwiatkowska
Lipopolysaccharide (LPS) is a component of the outer membrane of Gram-negative bacteria which induces strong pro-inflammatory reactions of mammals. These processes are triggered upon sequential binding of LPS to CD14, a GPI-linked plasma membrane raft protein, and to the TLR4/MD2 receptor complex. We have found earlier that upon LPS binding CD14 triggers generation of phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2], a lipid controlling subsequent pro-inflammatory cytokine production. Here we show that stimulation of RAW264 macrophage-like cells with LPS induces global changes of the level of fatty-acylated, most likely palmitoylated, proteins...
December 7, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/29215723/high-cholesterol-in-lipid-rafts-reduces-the-sensitivity-to-egfr-tki-therapy-in-non-small-cell-lung-cancer
#3
Qiufang Chen, Zhenzhen Pan, Min Zhao, Qin Wang, Chen Qiao, Liyun Miao, Xuansheng Ding
Overcoming EGFR-TKI resistant which has the initial enthusiasm over substantial clinical responses is a formidable challenge on nowadays. In this study, we showed that cholesterol level in lipid rafts in gefitinib resistant non-small cell lung cancer (NSCLC) cell lines was remarkably higher than gefitinib sensitive cell line, and depletion of cholesterol increase gefitinib sensitivity. Furthermore, Cholesterol-depleted enhanced gefitinib inhibit phosphorylation of EGFR, Akt-1, MEK1/2 and ERK1/2 and these were reversed in cholesterol add-back experiments...
December 7, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29212792/differential-effects-of-alcohol-and-its-metabolite-acetaldehyde-on-vascular-smooth-muscle-cell-notch-signaling-and-growth
#4
Ekaterina Hatch, David Morrow, Weimin Liu, Paul A Cahill, Eileen M Redmond
Alcohol (EtOH) consumption can variously affect cardiovascular disease (CVD). Our aim was to compare the effects of EtOH and its primary metabolite acetaldehyde (ACT) on vascular smooth muscle Notch signaling and cell growth that are important for atherogenesis. Human coronary artery smooth muscle cells (HCASMC) were treated with EtOH (25 mM) or ACT (10 μM, 25 μM). As previously reported, EtOH inhibited Notch signaling and growth of HCASMC. In contrast, ACT treatment stimulated HCASMC proliferation (cell counts) and increased proliferating cell nuclear antigen (PCNA) expression, concomitant with stimulation of Notch signaling as determined by increased Notch receptor (N1, N3) and target gene (HRT 1-3) mRNA levels...
December 6, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29208031/lipid-rafts-remain-stable-even-after-ionizing-radiation-induced-disintegration-of-%C3%AE-1-integrin-containing-focal-adhesions
#5
Laura Babel, Larissa Kruse, Steven Bump, Markus Langhans, Tobias Meckel
OBJECTIVE: Adhesion of cells to the extracellular matrix is facilitated by integrin receptors. We recently found that a nanoscale organization of plasma membrane located integrins containing the β1 subunit is responsible for an enhanced radio-resistance in 3D cultured cells over cells grown in 2D. While ionizing radiation is known to have broad effects on the lipid composition of the plasma membrane and their organization in lipid-rafts, it is not clear whether the effects of ionizing radiation on the nanoscale clustering of integrins is lipid-raft dependent...
December 6, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/29207553/determination-of-the-relative-efficacy-of-eicosapentaenoic-acid-and-docosahexaenoic-acid-for-anti-cancer-effects-in-human-breast-cancer-models
#6
REVIEW
Laura VanderSluis, Vera C Mazurak, Sambasivarao Damaraju, Catherine J Field
Epidemiological studies have associated high fish oil consumption with decreased risk of breast cancer (BC). n-3 long chain polyunsaturated fatty acids (n-3 LCPUFA), eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) found in fish and fish oils exert anti-cancer effects. However, few studies have examined the relative efficacy of EPA and DHA alone and in mixtures on BC subtypes. This was the objective of the present review, as this research is a necessity for the translation of findings to human health and disease...
December 4, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29207048/tlr4-promotes-the-expression-of-hif-1%C3%AE-by-triggering-reactive-oxygen-species-in-cervical-cancer-cells-in%C3%A2-vitro-implications-for-therapeutic-intervention
#7
Xiao Yang, Gan Tao Chen, Yan Qing Wang, Shu Xian, Li Zhang, Shao Ming Zhu, Feng Pan, Yan Xiang Cheng
The present study investigated the mechanism underlying Toll-like receptor 4 (TLR4)-mediated stimulation of hypoxia-inducible factor-1α (HIF-1α) activity and its association with reactive oxygen species (ROS) in cervical cancer cells. SiHa cells were cultured and randomized to control, lipopolysaccharide (LPS), methyl-β-cyclodextrin (MβCD)+LPS, ammonium pyrrolidinedithiocarbamate (PDTC)+LPS, ST2825+LPS and small interfering (si) RNA TLR4+LPS treatment groups. Cell proliferation was quantified using an MTT assay, cell cloning was performed using soft agar colony formation and HIF-1α expression was detected by immunocytochemical staining and western blot analyses...
November 20, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29201101/interfering-with-lipid-raft-association-a-mechanism-to-control-influenza-virus-infection-by-sambucus-nigra
#8
Shahla Shahsavandi, Mohammad Majid Ebrahimi, Ameneh Hasaninejad Farahani
Sambucus nigra (elder) are broadly used species to treat microbial infections. The potential antiviral activity and mechanism action of elder fruit (EF) in human epithelium cell (A549) cultures infected with H9N2 influenza virus were determined. The effect of various concentrations of EF on influenza virus replication was examined by using virus titration, quantitative real time RT-PCR, fusion and lipid raft assays following two treatment procedures: A) pre-treated H9N2 virus with each concentration of EF extract and transfection of A549 cell cultures, and B) each concentrations of EF was added to H9N2 virus infected-cell cultures following virus adsorption...
2017: Iranian Journal of Pharmaceutical Research: IJPR
https://www.readbyqxmd.com/read/29196683/preferential-selection-of-arginine-at-the-lipid-water-interface-of-trpv1-during-vertebrate-evolution-correlates-with-its-snorkeling-behaviour-and-cholesterol-interaction
#9
Somdatta Saha, Arijit Ghosh, Nikhil Tiwari, Ashutosh Kumar, Abhishek Kumar, Chandan Goswami
TRPV1 is a thermo-sensitive ion channel involved in neurosensory and other physiological functions. The trans-membrane helices of TRPV1 undergo quick and complex conformational changes governed by thermodynamic parameters and membrane components leading to channel opening. However, the molecular mechanisms underlying such events are poorly understood. Here we analysed the molecular evolution of TRPV1 at the lipid-water-interface region (LWI), typically defined as a layer of 6 Å thickness on each side of the membrane with less availability of free water...
December 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29196620/emphatic-visualization-of-sphingomyelin-rich-domains-by-inter-lipid-fret-imaging-using-fluorescent-sphingomyelins
#10
Masanao Kinoshita, Hikaru Ano, Michio Murata, Kenta Shigetomi, Junichi Ikenouchi, Nobuaki Matsumori
Imaging the distribution of sphingomyelin (SM) in membranes is an important issue in lipid-raft research. Recently we developed novel fluorescent SM analogs that exhibit partition and dynamic behaviors similar to native SM, and succeeded in visualizing lateral domain-segregation between SM-rich liquid-ordered (Lo) and SM-poor liquid-disordered (Ld) domains. However, because the fluorescent contrast between these two domains depends directly on their partition ratio for the fluorescent SMs, domain-separation becomes indeterminate when the distribution difference is not great enough...
December 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29196159/cholesterol-trafficking-and-raft-like-membrane-domain-composition-mediate-scavenger-receptor-class-b-type-1-dependent-lipid-sensing-in-intestinal-epithelial-cells
#11
Etienne Morel, Sara Ghezzal, Géraldine Lucchi, Caroline Truntzer, Jean-Paul Pais de Barros, Françoise Simon-Plas, Sylvie Demignot, Chieko Mineo, Philip W Shaul, Armelle Leturque, Monique Rousset, Véronique Carrière
Scavenger receptor Class B type 1 (SR-B1) is a lipid transporter and sensor. In intestinal epithelial cells, SR-B1-dependent lipid sensing is associated with SR-B1 recruitment in raft-like/ detergent-resistant membrane domains and interaction of its C-terminal transmembrane domain with plasma membrane cholesterol. To clarify the initiating events occurring during lipid sensing by SR-B1, we analyzed cholesterol trafficking and raft-like domain composition in intestinal epithelial cells expressing wild-type SR-B1 or the mutated form SR-B1-Q445A, defective in membrane cholesterol binding and signal initiation...
November 28, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29190778/mir-6835-promoted-lps-induced-inflammation-of-huvecs-associated-with-the-interaction-between-tlr-4-and-adipor1-in-lipid-rafts
#12
Jiao Liu, Guang Li, Chuang Chen, Dechang Chen, Qingshan Zhou
BACKGROUND: High mortality rate of critically-ill patients could be induced by sepsis and septic shock, which is the extremely life threatening. The purpose of this work is to identify and evaluate the potential regulatory mechanism of LPS-induced inflammation associated with miR-6835 and lipid rafts in HUVECs. METHODS: The 3' UTR luciferase activity of AdipoR1 was detected, which was predicted the potential target gene of miR-6835. Moreover, the treated HUVECs with or without inhibitors or mimics of miR-6835 were used...
2017: PloS One
https://www.readbyqxmd.com/read/29187642/irisin-protects-mitochondria-function-during-pulmonary-ischemia-reperfusion-injury
#13
Ken Chen, Zaicheng Xu, Yukai Liu, Zhen Wang, Yu Li, Xuefei Xu, Caiyu Chen, Tianyang Xia, Qiao Liao, Yonggang Yao, Cindy Zeng, Duofen He, Yongjian Yang, Tao Tan, Jianxun Yi, Jingsong Zhou, Hua Zhu, Jianjie Ma, Chunyu Zeng
Limb remote ischemic preconditioning (RIPC) is an effective means of protection against ischemia/reperfusion (IR)-induced injury to multiple organs. Many studies are focused on identifying endocrine mechanisms that underlie the cross-talk between muscle and RIPC-mediated organ protection. We report that RIPC releases irisin, a myokine derived from the extracellular portion of fibronectin domain-containing 5 protein (FNDC5) in skeletal muscle, to protect against injury to the lung. Human patients with neonatal respiratory distress syndrome show reduced concentrations of irisin in the serum and increased irisin concentrations in the bronchoalveolar lavage fluid, suggesting transfer of irisin from circulation to the lung under physiologic stress...
November 29, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/29184850/internalization-of-the-active-subunit-of-the-aggregatibacter-actinomycetemcomitans-cytolethal-distending-toxin-is-dependent-upon-cellugyrin-synaptogyrin-2-a-host-cell-non-neuronal-paralog-of-the-synaptic-vesicle-protein-synaptogyrin-1
#14
Kathleen Boesze-Battaglia, Lisa P Walker, Anuradha Dhingra, Konstantin Kandror, Hsin-Yao Tang, Bruce J Shenker
The Aggregatibacter actinomycetemcomitans cytolethal distending toxin (Cdt) is a heterotrimeric AB2 toxin capable of inducing lymphocytes, and other cell types, to undergo cell cycle arrest and apoptosis. Exposure to Cdt results in binding to the cell surface followed by internalization and translocation of the active subunit, CdtB, to intracellular compartments. These events are dependent upon toxin binding to cholesterol in the context of lipid rich membrane microdomains often referred to as lipid rafts. We now demonstrate that, in addition to binding to the plasma membrane of lymphocytes, another early and critical event initiated by Cdt is the translocation of the host cell protein, cellugyrin (synaptogyrin-2) to the same cholesterol-rich microdomains...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29166667/flotillin-scaffold-activity-contributes-to-type-vii-secretion-system-assembly-in-staphylococcus-aureus
#15
Benjamin Mielich-Süss, Rabea M Wagner, Nicole Mietrach, Tobias Hertlein, Gabriella Marincola, Knut Ohlsen, Sebastian Geibel, Daniel Lopez
Scaffold proteins are ubiquitous chaperones that promote efficient interactions between partners of multi-enzymatic protein complexes; although they are well studied in eukaryotes, their role in prokaryotic systems is poorly understood. Bacterial membranes have functional membrane microdomains (FMM), a structure homologous to eukaryotic lipid rafts. Similar to their eukaryotic counterparts, bacterial FMM harbor a scaffold protein termed flotillin that is thought to promote interactions between proteins spatially confined to the FMM...
November 22, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/29163910/cholesterol-directed-nanoparticle-assemblies-based-on-single-amino-acid-peptide-mutations-activate-cellular-uptake-and-decrease-tumor-volume
#16
Shang Li, Rongfeng Zou, Yaoquan Tu, Junchen Wu, Markita P Landry
Peptide drugs have been difficult to translate into effective therapies due to their low in vivo stability. Here, we report a strategy to develop peptide-based therapeutic nanoparticles by screening a peptide library differing by single-site amino acid mutations of lysine-modified cholesterol. Certain cholesterol-modified peptides are found to promote and stabilize peptide α-helix formation, resulting in selectively cell-permeable peptides. One cholesterol-modified peptide self-assembles into stable nanoparticles with considerable α-helix propensity stabilized by intermolecular van der Waals interactions between inter-peptide cholesterol molecules, and shows 68...
November 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29163167/experimental-evaluation-of-the-transport-mechanisms-of-poifn-%C3%AE-in-caco-2-cells
#17
Xin Liu, Sidi Zheng, Yue Qin, Wenya Ding, Yabin Tu, Xingru Chen, Yunzhou Wu, Li Yanhua, Xuehui Cai
For the development of an efficient intestinal delivery system for Porcine interferon-α (PoIFN-α), the understanding of transport mechanisms of which in the intestinal cell is essential. In this study, we investigated the absorption mechanisms of PoIFN-α in intestine cells. Caco-2 cells and fluorescein isothiocyanate-labeled (FITC)-PoIFN-α were used to explore the whole transport process, including endocytosis, intracellular trafficking, exocytosis, and transcytosis. Via various techniques, the transport pathways of PoIFN-α in Caco-2 cells and the mechanisms were clarified...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29162448/intracellular-cholesterol-level-regulates-sensitivity-of-glioblastoma-cells-against-temozolomide-induced-cell-death-by-modulation-of-caspase-8-activation-via-death-receptor-5-accumulation-and-activation-in-the-plasma-membrane-lipid-raft
#18
Yutaro Yamamoto, Arata Tomiyama, Nobuyoshi Sasaki, Hideki Yamaguchi, Takuya Shirakihara, Katsuhiko Nakashima, Kosuke Kumagai, Satoru Takeuchi, Terushige Toyooka, Kojiro Wada, Yoshitaka Narita, Koichi Ichimura, Ryuichi Sakai, Hiroki Namba, Kentaro Mori
Development of resistance against temozolomide (TMZ) in glioblastoma (GBM) after continuous treatment with TMZ is one of the critical problems in clinical GBM therapy. Intracellular cholesterol regulates cancer cell biology, but whether intracellular cholesterol is involved in TMZ resistance of GBM cells remains unclear. The involvement of intracellular cholesterol in acquired resistance against TMZ in GBM cells was investigated. Intracellular cholesterol levels were measured in human U251 MG cells with acquired TMZ resistance (U251-R cells) and TMZ-sensitive control U251 MG cells (U251-Con cells), and found that the intracellular cholesterol level was significantly lower in U251-R cells than in U251-Con cells...
November 18, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29158160/glycoprotein-m6a-as-a-signaling-transducer-in-neuronal-lipid-rafts
#19
Yasuyuki Ito, Atsuko Honda, Michihiro Igarashi
Neuronal development is composed of the complex steps which involve many signaling proteins. On the other hand, there are many proteins highly expressed in the differentiated neurons at developmental stages, but of which physiological functions are not precisely known so far. Glycoprotein 6a (GPM6a) currently belongs to such proteins. This protein has four-transmembrane domains and is a member of proteolipid protein family. Recently, we demonstrated that GPM6a is highly concentrated in lipid rafts of the developing neuron with its palmitoylation, and that this molecule is involved in rapid determination of the neuronal polarity, in response to laminin, an extracellular matrix protein (Honda et al...
November 17, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/29155700/phase-behavior-of-charged-vesicles-under-symmetric-and-asymmetric-solution-conditions-monitored-with-fluorescence-microscopy
#20
Bastian Kubsch, Tom Robinson, Jan Steinkühler, Rumiana Dimova
Phase-separated giant unilamellar vesicles (GUVs) exhibiting coexisting liquid-ordered and liquid-disordered domains are a common biophysical tool to investigate the lipid raft hypothesis. Numerous studies, however, neglect the impact of physiological solution conditions. On that account, the current work presents the effect of high-salinity buffer and trans-membrane solution asymmetry on liquid-liquid phase separation in charged GUVs grown from dioleylphosphatidylglycerol, egg sphingomyelin, and cholesterol...
October 24, 2017: Journal of Visualized Experiments: JoVE
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