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Lipid transfer protein

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https://www.readbyqxmd.com/read/29774141/exosome-mediated-peritoneal-dissemination-in-gastric-cancer-and-its-clinical-applications
#1
REVIEW
Kai-Bo Chen, Jian Chen, Xiao-Li Jin, Yi Huang, Qiu-Ming Su, Li Chen
The prognosis of patients with peritoneal dissemination from gastric cancer is poor, and the underlying molecular mechanism remains unclear. Exosomes, as macromolecular phospholipid bilayer vesicles comprising of proteins, nucleic acids and lipids, serve as mediators of cell-cell communication. Gastric cancer tumor-derived exosomes may be involved in the pathological process of peritoneal dissemination by mediating crosstalk between cancer cells and mesothelial cells, to result in the induction of enhanced tumor growth, migratory, adhesive and invasive abilities, peritoneal fibrosis and apoptosis, mesothelial-to-mesenchymal transition, angiogenesis and chemoresistance...
June 2018: Biomedical Reports
https://www.readbyqxmd.com/read/29772998/partially-purified-aqueous-fraction-of-desmodium-gyrans-dc-improves-reverse-cholesterol-transport-and-lipoprotein-metabolism-in-wistar-rats-fed-with-high-fat-diet
#2
M S Indu, Jose Padikkala, Achuthan C Raghavamenon
Apart from the conventional hypolipidemic therapy, plaque regression through enhanced reverse cholesterol transport (RCT) has emerged as novel approach in atherosclerotic drug development. High-density lipoprotein (HDL) mimetics as well as agents that augment the functional HDL and RCT pathways are under intense exploration. Desmodium gyrans (Fabacea) has been shown to have hypolipidemic efficacy, with an HDL-enhancing property. In this study, a chromatographically purified active fraction of D. gyrans (DGMAF) significantly decreased the serum and lipid profiles as well as lipotoxicity in liver in Wistar rats fed with high-fat diet (HFD)...
2018: Journal of Environmental Pathology, Toxicology and Oncology
https://www.readbyqxmd.com/read/29769636/molecular-details-of-dimerization-kinetics-reveal-negligible-populations-of-transient-%C3%A2%C2%B5-opioid-receptor-homodimers-at-physiological-concentrations
#3
Derya Meral, Davide Provasi, Diego Prada-Gracia, Jan Möller, Kristen Marino, Martin J Lohse, Marta Filizola
Various experimental and computational techniques have been employed over the past decade to provide structural and thermodynamic insights into G Protein-Coupled Receptor (GPCR) dimerization. Here, we use multiple microsecond-long, coarse-grained, biased and unbiased molecular dynamics simulations (a total of ~4 milliseconds) combined with multi-ensemble Markov state models to elucidate the kinetics of homodimerization of a prototypic GPCR, the µ-opioid receptor (MOR), embedded in a 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC)/cholesterol lipid bilayer...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29766560/further-options-for-treating-lipids-in-people-with-diabetes-targeting-ldl-cholesterol-and-beyond
#4
REVIEW
A S Wierzbicki
Diabetes is associated with increased cardiovascular disease (CVD) risk. Previous studies with statins have established that a 1 mmol/l reduction in LDL-cholesterol reduces CVD events by 21% over 5 years in people with diabetes. More recently, trials in people with acute coronary syndromes showed that ezetimibe reduced CVD events by 6% at 5 years and achieved a LDL-cholesterol of 1.6 mmol/l with better results in people with Type 2 diabetes. Several novel lipid-lowering therapies have recently been developed...
May 15, 2018: Diabetic Medicine: a Journal of the British Diabetic Association
https://www.readbyqxmd.com/read/29758020/defining-icr-mo-an-intrinsic-colistin-resistance-determinant-from-moraxella-osloensis
#5
Wenhui Wei, Swaminath Srinivas, Jingxia Lin, Zichen Tang, Shihua Wang, Saif Ullah, Vishnu Goutham Kota, Youjun Feng
Polymyxin is the last line of defense against severe infections caused by carbapenem-resistant gram-negative pathogens. The emergence of transferable MCR-1/2 polymyxin resistance greatly challenges the renewed interest in colistin (polymyxin E) for clinical treatments. Recent studies have suggested that Moraxella species are a putative reservoir for MCR-1/2 genetic determinants. Here, we report the functional definition of ICR-Mo from M. osloensis, a chromosomally encoded determinant of colistin resistance, in close relation to current MCR-1/2 family...
May 14, 2018: PLoS Genetics
https://www.readbyqxmd.com/read/29755560/anti-hypercholesterolemic-effect-of-berbamine-isolated-from-rhizoma-coptidis-in-hypercholesterolemic-zebrafish-induced-by-high-cholesterol-diet
#6
Bing Han, Shuming Kou, Kai He, Yulong Han, Yue Wang, Tao Huang, Xia Zhou, Yubo Xiao, Xuegang Li, Xiaoli Ye
The anti-hypercholesterolemic effect of berbamine (BBM) isolated from Rhizoma Coptidis (RC) was investigated in hypercholesterolemic zebrafish model induced by high-cholesterol (HC) diet. Zebrafish embryo assay revealed no significant difference in morphology and cell death with the treatment of BBM less than 20 μg/mL. In zebrafish larvae, the fluorescently labeled cholesterol in caudal artery was reduced dose-dependently after BBM treatment. For adult zebrafish, administration of 0.2% BBM exhibited a significant decrease in plasma total cholesterol (TC), triglyceride (TG) and low-density lipoprotein cholesterol (LDL-c) levels by 37%, 38% and 28%, respectively, along with a fall in lipid content in liver...
2018: Iranian Journal of Pharmaceutical Research: IJPR
https://www.readbyqxmd.com/read/29754714/membrane-potential-distinctly-modulates-mobility-and-signaling-of-il-2-and-15-receptors-in-t-cells
#7
Éva Nagy, Gábor Mocsár, Veronika Sebestyén, Julianna Volkó, Ferenc Papp, Katalin Tóth, Sándor Damjanovich, György Panyi, Thomas A Waldmann, Andrea Bodnár, György Vámosi
The high electric field across the plasma membrane might influence the conformation and behavior of transmembrane proteins that have uneven charge distributions in or near their transmembrane regions. Membrane depolarization of T cells occurs in the tumor microenvironment and in inflamed tissues because of K+ release from necrotic cells and hypoxia affecting the expression of K+ channels. However, little attention has been given to the effect of membrane potential (MP) changes on membrane receptor function...
May 10, 2018: Biophysical Journal
https://www.readbyqxmd.com/read/29751583/blood-pressure-lowering-effect-of-cuban-policosanol-is-accompanied-by-improvement-of-hepatic-inflammation-lipoprotein-profile-and-hdl-quality-in-spontaneously-hypertensive-rats
#8
Kyung-Hyun Cho, Dhananjay Yadav, Suk-Jeong Kim, Jae-Ryong Kim
We investigated the antihypertensive effect of policosanol on spontaneously hypertensive rats (SHR). For this, we analyzed blood pressure, blood lipid, and lipoprotein properties in male SHR after consumption of Cuban policosanol (PCO). The experimental groups were as follows: normotensive Wistar Kyoto (WKY) control, SHR group fed normal diet (ND), SHR group fed 20 mg of PCO, SHR group fed 100 mg of PCO, and SHR group fed 200 mg of PCO per kg of body weight. After eight weeks, the SHR control group showed gradual increases up to 21% in systolic blood pressure (SBP) and diastolic blood pressure (DBP) compared with values at week 0...
May 3, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29742407/mechanism-of-long-chain-free-fatty-acid-protonation-at-the-membrane-water-interface
#9
Alina A Pashkovskaya, Mario Vazdar, Lars Zimmermann, Olga Jovanovic, Peter Pohl, Elena E Pohl
Long-chain free fatty acids (FFAs) play an important role in several physiological and pathological processes such as lipid fusion, adjustments of membrane permeability and fluidity, and the regulation of enzyme and protein activities. FFA-facilitated membrane proton transport (flip-flop) and FFA-dependent proton transport by membrane proteins (e.g., mitochondrial uncoupling proteins) are governed by the difference between FFA's intrinsic pKa value and the pH in the immediate membrane vicinity. Thus far, a quantitative understanding of the process has been hampered, because the pKa value shifts upon moving the FFA from the aqueous solution into the membrane...
May 8, 2018: Biophysical Journal
https://www.readbyqxmd.com/read/29741733/functional-role-of-fibrillin5-in-acclimation-to-photooxidative-stress
#10
Mayuko Otsubo, Chikako Ikoma, Mariko Ueda, Yumi Ishii, Noriaki Tamura
The functional role of a lipid-associated soluble protein, fibrillin5 (FBN5), was determined with the Arabidopsis thaliana homozygous fbn5-knockout mutant line (SALK_064597) that carries a T-DNA insertion within the FBN5 gene. The fbn5 mutant remained alive, displaying a slow growth and a severe dwarf phenotype. The mutant grown even under growth light conditions at 80 μmol·m-2·s-1 showed a drastic decrease in electron transfer activities around PSII, with little change in electron transfer activities around PSI, a phenomenon which was exaggerated under high light stress...
May 7, 2018: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29740315/compartmentalized-camp-signaling-associated-with-lipid-raft-and-non-raft-membrane-domains-in-adult-ventricular-myocytes
#11
Shailesh R Agarwal, Jackson Gratwohl, Mia Cozad, Pei-Chi Yang, Colleen E Clancy, Robert D Harvey
Aim: Confining cAMP production to discrete subcellular locations makes it possible for this ubiquitous second messenger to elicit unique functional responses. Yet, factors that determine how and where the production of this diffusible signaling molecule occurs are incompletely understood. The fluid mosaic model originally proposed that signal transduction occurs through random interactions between proteins diffusing freely throughout the plasma membrane. However, it is now known that the movement of membrane proteins is restricted, suggesting that the plasma membrane is segregated into distinct microdomains where different signaling proteins can be concentrated...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29739325/basic-leucine-zipper-transcription-factor-slbzip1-mediates-salt-and-drought-stress-tolerance-in-tomato
#12
Mingku Zhu, Xiaoqing Meng, Jing Cai, Ge Li, Tingting Dong, Zongyun Li
BACKGROUND: Basic region/leucine zipper (bZIP) transcription factors perform as crucial regulators in ABA-mediated stress response in plants. Nevertheless, the functions for most bZIP family members in tomato remain to be deciphered. RESULTS: Here we examined the functional characterization of SlbZIP1 under salt and drought stresses in tomato. Silencing of SlbZIP1 in tomato resulted in reduced expression of multiple ABA biosynthesis- and signal transduction-related genes in transgenic plants...
May 8, 2018: BMC Plant Biology
https://www.readbyqxmd.com/read/29736804/influence-of-fatty-acid-modification-on-uptake-of-lovastatin-loaded-reconstituted-high-density-lipoprotein-by-foam-cells
#13
Yun Yang, Ji Wang, Hongliang He, Wenli Zhang, Yuansheng Zhang, Jianping Liu
PURPOSE: Spherical reconstituted high density lipoprotein (rHDL) can target atherosclerotic lesions by the very low density lipoprotein (VLDL) receptor, which is seldom expressed in liver. By promoting this pathway, the targeting efficiency was hyphothesized to be improved due to avoiding undesired uptake in liver mediated by the scavenger receptor class B type I (SR-BI). In this study, how fatty acid modification in spherical rHDL influenced the VLDL receptor-mediated endocytosis pathway was investigated...
May 7, 2018: Pharmaceutical Research
https://www.readbyqxmd.com/read/29732501/pkm2-dependent-metabolic-reprogramming-in-cd4-t-cells-is-crucial-for-hyperhomocysteinemia-accelerated-atherosclerosis
#14
Silin Lü, Jiacheng Deng, Huiying Liu, Bo Liu, Juan Yang, Yutong Miao, Jing Li, Nan Wang, Changtao Jiang, Qingbo Xu, Xian Wang, Juan Feng
Inflammation mediated by activated T cells plays an important role in the initiation and progression of hyperhomocysteinemia (HHcy)-accelerated atherosclerosis in ApoE-/- mice. Homocysteine (Hcy) activates T cells to secrete proinflammatory cytokines, especially interferon (IFN)-γ; however, the precise mechanisms remain unclear. Metabolic reprogramming is critical for T cell inflammatory activation and effector functions. Our previous study demonstrated that Hcy regulates T cell mitochondrial reprogramming by enhancing endoplasmic reticulum (ER)-mitochondria coupling...
May 7, 2018: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
https://www.readbyqxmd.com/read/29732143/understanding-gpcr-recognition-and-folding-from-nmr-studies-of-fragments
#15
Jacopo Marino, Reto Walser, Martin Poms, Oliver Zerbe
Cotranslational protein folding is a vectorial process, and for membrane proteins, N-terminal helical segments are the first that become available for membrane insertion. While structures of many G-protein coupled receptors (GPCRs) in various states have been determined, the details of their folding pathways are largely unknown. The seven transmembrane (TM) helices of GPCRs often contain polar residues within the hydrophobic core, and some of the helices in isolation are predicted to be only marginally stable in a membrane environment...
2018: RSC Advances
https://www.readbyqxmd.com/read/29732092/impact-of-the-lipid-bilayer-on-energy-transfer-kinetics-in-the-photosynthetic-protein-lh2
#16
John I Ogren, Ashley L Tong, Samuel C Gordon, Aurélia Chenu, Yue Lu, Robert E Blankenship, Jianshu Cao, Gabriela S Schlau-Cohen
Photosynthetic purple bacteria convert solar energy to chemical energy with near unity quantum efficiency. The light-harvesting process begins with absorption of solar energy by an antenna protein called Light-Harvesting Complex 2 (LH2). Energy is subsequently transferred within LH2 and then through a network of additional light-harvesting proteins to a central location, termed the reaction center, where charge separation occurs. The energy transfer dynamics of LH2 are highly sensitive to intermolecular distances and relative organizations...
March 28, 2018: Chemical Science
https://www.readbyqxmd.com/read/29731975/deletion-of-plasma-phospholipid-transfer-protein-pltp-increases-microglial-phagocytosis-and-reduces-cerebral-amyloid-%C3%AE-deposition-in-the-j20-mouse-model-of-alzheimer-s-disease
#17
Marine Mansuy, Stella Baille, Geoffrey Canet, Amélie Borie, Catherine Cohen-Solal, Michel Vignes, Véronique Perrier, Nathalie Chevallier, Naig Le Guern, Valérie Deckert, Laurent Lagrost, Laurent Givalois, Catherine Desrumaux
Plasma phospholipid transfer protein (PLTP) binds and transfers a number of amphipathic compounds, including phospholipids, cholesterol, diacylglycerides, tocopherols and lipopolysaccharides. PLTP functions are relevant for many pathophysiological alterations involved in neurodegenerative disorders (especially lipid metabolism, redox status, and immune reactions), and a significant increase in brain PLTP levels was observed in patients with Alzheimer's disease (AD) compared to controls. To date, it has not been reported whether PLTP can modulate the formation of amyloid plaques, i...
April 13, 2018: Oncotarget
https://www.readbyqxmd.com/read/29728394/cetp-cholesteryl-ester-transfer-protein-concentration-a-genome-wide-association-study-followed-by-mendelian-randomization-on-coronary-artery-disease
#18
Lisanne L Blauw, Ruifang Li-Gao, Raymond Noordam, Renée de Mutsert, Stella Trompet, Jimmy F P Berbée, Yanan Wang, Jan B van Klinken, Tim Christen, Diana van Heemst, Dennis O Mook-Kanamori, Frits R Rosendaal, J Wouter Jukema, Patrick C N Rensen, Ko Willems van Dijk
BACKGROUND: We aimed to identify independent genetic determinants of circulating CETP (cholesteryl ester transfer protein) to assess causal effects of variation in CETP concentration on circulating lipid concentrations and cardiovascular disease risk. METHODS: A genome-wide association discovery and replication study on serum CETP concentration were embedded in the NEO study (Netherlands Epidemiology of Obesity). Based on the independent identified variants, Mendelian randomization was conducted on serum lipids (NEO study) and coronary artery disease (CAD; CARDIoGRAMplusC4D consortium)...
May 2018: Circulation. Genomic and precision medicine
https://www.readbyqxmd.com/read/29726048/role-of-glycans-in-cholesteryl-ester-transfer-protein-revealed-by-md-simulation
#19
Dongxiao Hao, Zhiwei Yang, Teng Gao, Zhiqi Tian, Lei Zhang, Shengli Zhang
Current cholesteryl ester transfer protein (CETP) inhibitors are designed based on the unglycosylated crystal structure, and most of them have failed to cure cardiovascular disease (CVD). It is particularly important for us to investigate the glycosylation structure of CETP (CETP-G) and effect of glycans on the structure and function of CETP. Here, we used a total of 3.0-μs molecular dynamics trajectories of nascent structure of CETP (CETP-N) and CETP-G to study their structural differentiations, to shed new light on the CETP-mediated lipid exchange...
May 3, 2018: Proteins
https://www.readbyqxmd.com/read/29726046/extracellular-vesicles-toward-a-clinical-application-in-urological-cancer-treatment
#20
REVIEW
Fumihiko Urabe, Nobuyoshi Kosaka, Takahiro Kimura, Shin Egawa, Takahiro Ochiya
Extracellular vesicles are nanometer-sized lipid membranous vesicles that are released from almost all types of cells into the extracellular space. Extracellular vesicles have gained considerable attention in the past decade, and emerging evidence suggests that they play novel roles in mediating cancer biology. Extracellular vesicles contain pathogenic components, such as proteins, DNA fragments, messenger ribonucleic acids, non-coding ribonucleic acids and lipids, all of which mediate paracrine signaling in the tumor microenvironment...
May 3, 2018: International Journal of Urology: Official Journal of the Japanese Urological Association
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