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Hepatitis C virus lipids

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https://www.readbyqxmd.com/read/28448054/lipid-droplet-isolation-for-quantitative-mass-spectrometry-analysis
#1
Kathrin Rösch, Marcel Kwiatkowski, Hartmut Schlüter, Eva Herker
Lipid droplets are vital to the replication of a variety of different pathogens, most prominently the Hepatitis C Virus (HCV), as the putative site of virion morphogenesis. Quantitative lipid droplet proteome analysis can be used to identify proteins that localize to or are displaced from lipid droplets under conditions such as virus infections. Here, we describe a protocol that has been successfully used to characterize the changes in the lipid droplet proteome following infection with HCV. We use Stable Isotope Labeling with Amino Acids in Cell Culture (SILAC) and thus label the complete proteome of one population of cells with "heavy" amino acids to quantitate the proteins by mass spectrometry...
April 17, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28443075/grim-19-restricts-hcv-replication-by-attenuating-intracellular-lipid-accumulation
#2
Jung-Hee Kim, Pil S Sung, Eun B Lee, Wonhee Hur, Dong J Park, Eui-Cheol Shin, Marc P Windisch, Seung K Yoon
Gene-associated with retinoid-interferon-induced mortality 19 (GRIM-19) targets multiple signaling pathways involved in cell death and growth. However, the role of GRIM-19 in the pathogenesis of hepatitis virus infections remains unexplored. Here, we investigated the restrictive effects of GRIM-19 on the replication of hepatitis C virus (HCV). We found that GRIM-19 protein levels were reduced in HCV-infected Huh7 cells and Huh7 cells harboring HCV replicons. Moreover, ectopically expressed GRIM-19 caused a reduction in both intracellular viral RNA levels and secreted viruses in HCVcc-infected cell cultures...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28437468/role-of-cleavage-at-the-core-e1-junction-of-hepatitis-c-virus-polyprotein-in-viral-morphogenesis
#3
Véronique Pène, Matthieu Lemasson, Francis Harper, Gérard Pierron, Arielle R Rosenberg
In hepatitis C virus (HCV) polyprotein sequence, core protein terminates with E1 envelope signal peptide. Cleavage by signal peptidase (SP) separates E1 from the complete form of core protein, anchored in the endoplasmic reticulum (ER) membrane by the signal peptide. Subsequent cleavage of the signal peptide by signal-peptide peptidase (SPP) releases the mature form of core protein, which preferentially relocates to lipid droplets. Both of these cleavages are required for the HCV infectious cycle, supporting the idea that HCV assembly begins at the surface of lipid droplets, yet SPP-catalyzed cleavage is dispensable for initiation of budding in the ER...
2017: PloS One
https://www.readbyqxmd.com/read/28428715/impact-of-interferon-free-antivirus-therapy-on-lipid-profiles-in-patients-with-chronic-hepatitis-c-genotype-1b
#4
Daisuke Endo, Kenichi Satoh, Noritomo Shimada, Atsushi Hokari, Yoshio Aizawa
AIM: To investigate the influence of interferon-free antivirus therapy on lipid profiles in chronic hepatitis C virus genotype 1b (HCV1b) infection. METHODS: Interferon-free antiviral agents were used to treat 276 patients with chronic HCV1b infection, and changes in serum lipids of those who achieved sustained virologic response (SVR) were examined. The treatment regimen included 24 wk of daclatasvir plus asunaprevir (DCV + ASV) or 12 wk of sofosbuvir plus ledipasvir (SOF + LDV)...
April 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28421422/hepatitis-c-virus-genotype-3-update-on-current-and-emergent-therapeutic-interventions
#5
REVIEW
Steven W Johnson, Dorothea K Thompson, Brianne Raccor
PURPOSE OF REVIEW: Direct-acting antiviral agents (DAAs) have markedly improved the prognosis of hepatitis C virus (HCV)-genotype 3 (GT3), a highly prevalent infection worldwide. However, in patients with hepatic fibrosis, cirrhosis, or hepatocellular carcinoma (HCC), GT3 infection presents a treatment challenge compared with other genotypes. The dependence of the HCV life cycle on host lipid metabolism suggests the possible utility of targeting host cellular factors for combination anti-HCV therapy...
June 2017: Current Infectious Disease Reports
https://www.readbyqxmd.com/read/28370030/a-nonenveloped-virus-with-a-lipid-envelope-hepatitis-a-virus-as-used-in-virus-reduction-studies
#6
Anna-Maria Kapsch, Maria R Farcet, Gerhard Antoine, Thomas R Kreil
BACKGROUND: Recently, a quasi-lipid-enveloped (LE) form of the traditionally nonlipid-enveloped (NLE) hepatitis A virus (HAV) was described in human serum and cell culture-derived HAV stocks. This discovery challenges the understanding of HAV reduction in virus clearance studies of plasma products, which were performed under the premise of an NLE nature of this virus. Here, the presence of LE particles in HAV stocks used for reduction studies was verified, and the hypothesis that LE and NLE particles might contribute to the differential heat sensitivity of HAV variants during heat treatment of human serum albumin was evaluated...
March 28, 2017: Transfusion
https://www.readbyqxmd.com/read/28339489/human-subtilisin-kexin-isozyme-1-ski-1-site-1-protease-s1p-regulates-cytoplasmic-lipid-droplet-abundance-a-potential-target-for-indirect-acting-anti-dengue-virus-agents
#7
Anastasia Hyrina, Fanrui Meng, Steven J McArthur, Sharlene Eivemark, Ivan R Nabi, François Jean
Viral hijacking and manipulation of host-cell biosynthetic pathways by human enveloped viruses are shared molecular events essential for the viral lifecycle. For Flaviviridae members such as hepatitis C virus and dengue virus (DENV), one of the key subsets of cellular pathways that undergo manipulation is the lipid metabolic pathways, underlining the importance of cellular lipids and, in particular, lipid droplets (LDs) in viral infection. Here, we hypothesize that targeting cellular enzymes that act as key regulators of lipid homeostasis and LD formation could represent a powerful approach to developing a novel class of broad-spectrum antivirals against infection associated with all DENV serotypes (1-4) circulating around the world...
2017: PloS One
https://www.readbyqxmd.com/read/28336560/lipoprotein-a-and-hiv-allele-specific-apolipoprotein-a-levels-predict-carotid-intima-media-thickness-in-hiv-infected-young-women-in-the-women-s-interagency-hiv-study
#8
Byambaa Enkhmaa, Erdembileg Anuurad, Wei Zhang, Chin-Shang Li, Robert Kaplan, Jason Lazar, Dan Merenstein, Roksana Karim, Brad Aouizerat, Mardge Cohen, Kenneth Butler, Savita Pahwa, Igho Ofotokun, Adaora A Adimora, Elizabeth Golub, Lars Berglund
OBJECTIVE: In the general population, lipoprotein(a) [Lp(a)] has been established as an independent causal risk factor for cardiovascular disease. Lp(a) levels are to a major extent regulated by a size polymorphism in the apolipoprotein(a) [apo(a)] gene. The roles of Lp(a)/apo(a) in human immunodeficiency virus (HIV)-related elevated cardiovascular disease risk remain unclear. APPROACH AND RESULTS: The associations between total plasma Lp(a) level, allele-specific apo(a) level, an Lp(a) level carried by individual apo(a) alleles, and common carotid artery intima-media thickness were assessed in 150 HIV-infected and 100 HIV-uninfected women in the WIHS (Women's Interagency HIV Study)...
May 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28336330/requirement-of-cytosolic-phospholipase-a2-gamma-in-lipid-droplet-formation
#9
Xi Su, Shuhui Liu, Xianwen Zhang, Sin Man Lam, Xue Hu, Yuan Zhou, Jizheng Chen, Yun Wang, Chunchen Wu, Guanghou Shui, Mengji Lu, Rongjuan Pei, Xinwen Chen
Lipid droplet (LD) accumulation in hepatocytes is a typical character of steatosis. Hepatitis C virus (HCV) infection, one of the risk factors related to steatosis, induced LD accumulation in cultured cells. However, the mechanisms of which HCV induce LD formation are not fully revealed. Previously we identified cytosolic phospholipase A2 gamma (PLA2G4C) as a host factor upregulated by HCV infection and involved in HCV replication. Here we further revealed that PLA2G4C plays an important role in LD biogenesis and refined the functional analysis of PLA2G4C in LD biogenesis and HCV assembly...
March 20, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28249699/detection-of-high-biliary-and-fecal-viral-loads-in-patients-with-chronic-hepatitis-c-virus-infection
#10
Hugo Monrroy, Jenniffer Angulo, Karla Pino, Pilar Labbé, Juan Francisco Miquel, Marcelo López-Lastra, Alejandro Soza
BACKGROUND: The life cycle of the hepatitis C virus (HCV) is closely associated with lipid metabolism. Recently, NPC1L1 (a cholesterol transporter) has been reported to function as an HCV receptor. This receptor is expressed in the hepatocyte canalicular membrane and in the intestine; serving as a key transporter for the cholesterol enterohepatic cycle. OBJECTIVES: We hypothesized that HCV might have a similar cycle, so we aimed to study the presence of HCV in bile and stools of infected patients...
February 26, 2017: Gastroenterología y Hepatología
https://www.readbyqxmd.com/read/28242560/viral-rewiring-of-cellular-lipid-metabolism-to-create-membranous-replication-compartments
#11
REVIEW
Jeroen Rpm Strating, Frank Jm van Kuppeveld
Positive-strand RNA (+RNA) viruses (e.g. poliovirus, hepatitis C virus, dengue virus, SARS-coronavirus) remodel cellular membranes to form so-called viral replication compartments (VRCs), which are the sites where viral RNA genome replication takes place. To induce VRC formation, these viruses extensively rewire lipid metabolism. Disparate viruses have many commonalities as well as disparities in their interactions with the host lipidome and accumulate specific sets of lipids (sterols, glycerophospholipids, sphingolipids) at their VRCs...
February 24, 2017: Current Opinion in Cell Biology
https://www.readbyqxmd.com/read/28223719/hepatitis-c-virus-associated-pruritus-etiopathogenesis-and-therapeutic-strategies
#12
EDITORIAL
Youssef Alhmada, Denis Selimovic, Fadi Murad, Sarah-Lilly Hassan, Youssef Haikel, Mossaad Megahed, Matthias Hannig, Mohamed Hassan
In addition to its contributing role in the development of chronic liver diseases, chronic hepatitis C virus (HCV) infection is associated with extrahepatic manifestations, particularly, cutaneous-based disorders including those with pruritus as a symptom. Pruritus is frequently associated with the development of chronic liver diseases such as cholestasis and chronic viral infection, and the accumulation of bile acids in patients' sera and tissues as a consequence of liver damage is considered the main cause of pruritus...
February 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28198443/serum-lipid-alterations-identified-in-chronic-hepatitis-b-hepatitis-b-virus-associated-cirrhosis-and-carcinoma-patients
#13
Tao Wu, Xiaojiao Zheng, Ming Yang, Aihua Zhao, Meng Li, Tianlu Chen, Jun Panee, Wei Jia, Guang Ji
The incidences of chronic hepatitis B (CHB), Hepatitis B virus (HBV)-associated cirrhosis and HBV-associated carcinoma are high and increasing. This study was designed to evaluate serum lipid metabolite changes that are associated with the progression from CHB to HBV-associated cirrhosis and ultimately to HBV-associated HCC. A targeted metabolomic assay was performed in fasting sera from 136 CHB patients, 104 HBV-associated cirrhosis, and 95 HBV-associated HCC using ultra-performance liquid chromatography triple quadrupole mass spectrometry...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28193659/oligonucleotide-lipid-conjugates-forming-g-quadruplex-structures-are-potent-and-pangenotypic-hepatitis-c-virus-entry-inhibitors-in-vitro-and-ex-vivo
#14
George Koutsoudakis, Alexia Paris de León, Carolina Herrera, Marcus Dorner, Gemma Pérez-Vilaró, Sébastien Lyonnais, Santiago Grijalvo, Ramon Eritja, Andreas Meyerhans, Gilles Mirambeau, Juana Díez
An HCV epidemic affecting HIV-infected men who have sex with men (MSM) is expanding worldwide. Albeit the improved cure rates obtained with the new direct-acting antiviral drug (DAA) combinations, the high rate of reinfection within this population calls urgently for novel preventive interventions. Here we show in cell culture and ex vivo experiments with human colorectal tissue that lipoquads, G-quadruplex DNA structures fused to cholesterol, are efficient HCV pangenotypic entry and cell-to-cell transmission inhibitors...
February 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28182619/contribution-of-common-infections-to-cardiovascular-risk-in-hiv-positive-individuals
#15
Victoria Berquist, Jennifer F Hoy, Janine M Trevillyan
HIV-positive individuals are at increased risk for cardiovascular disease due to complex interactions between the increased incidence of traditional cardiovascular risk factors and HIV and antiretroviral-associated inflammation and dyslipidemia. Increasing evidence suggests that a number of important co-pathogens, including cytomegalovirus, hepatitis C virus, and periodontal disease, are likely to also be contributing. Mechanisms such as molecular mimicry and modification of lipids play a role; however, induction of systemic inflammation is the likely key pathogenic link by which this occurs...
February 9, 2017: AIDS Reviews
https://www.readbyqxmd.com/read/28152568/apolipoprotein-a-inhibits-hepatitis-c-virus-entry-through-interaction-with-infectious-particles
#16
Catarina Oliveira, Carole Fournier, Véronique Descamps, Virginie Morel, Corey A Scipione, Rocco Romagnuolo, Marlys L Koschinsky, Agnès Boullier, Paulo Marcelo, Jean-Marc Domon, Etienne Brochot, Gilles Duverlie, Catherine Francois, Sandrine Castelain, Francois Helle
The development of different cell culture models has greatly contributed to improve the knowledge of the hepatitis C virus (HCV) life cycle. However, it is still challenging to grow HCV clinical isolates in cell culture. This would open new perspectives to study HCV biology, including drug resistant variants emerging with new antiviral therapies. In this study we hypothesized that this hurdle could be due to the presence of inhibitory factors in patient serum. Combining polyethylene glycol precipitation, iodixanol gradient and size-exclusion chromatography, we obtained a purified fraction enriched in inhibitory factors from HCV seronegative sera...
February 2, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28148799/computational-prediction-of-the-heterodimeric-and-higher-order-structure-of-gpe1-gpe2-envelope-glycoproteins-encoded-by-hepatitis-c-virus
#17
Holly Freedman, Michael R Logan, Darren Hockman, Julia Koehler Leman, John Lok Man Law, Michael Houghton
Despite the recent success of newly developed direct-acting antivirals against hepatitis C, the disease continues to be a global health threat due to the lack of diagnosis of most carriers and the high cost of treatment. The heterodimer formed by glycoproteins E1 and E2 within the hepatitis C virus (HCV) lipid envelope is a potential vaccine candidate and antiviral target. While the structure of E1/E2 has not yet been resolved, partial crystal structures of the E1 and E2 ectodomains have been determined. The unresolved parts of the structure are within the realm of what can be modeled with current computational modeling tools...
April 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28126468/autotaxin-lysophosphatidic-acid-receptor-signalling-regulates-hepatitis-c-virus-replication
#18
Michelle J Farquhar, Isla S Humphreys, Simon A Rudge, Garrick K Wilson, Bishnupriya Bhattacharya, Maria Ciaccia, Ke Hu, Qifeng Zhang, Laurent Mailly, Gary M Reynolds, Margaret Ashcroft, Peter Balfe, Thomas F Baumert, Stephanie Roessler, Michael J O Wakelam, Jane A McKeating
BACKGROUND & AIMS: Chronic hepatitis C is a global health problem with an estimated 170 million hepatitis C virus (HCV) infected individuals at risk of progressive liver disease and hepatocellular carcinoma (HCC). Autotaxin (ATX, gene name: ENPP2) is a phospholipase with diverse roles in the physiological and pathological processes including inflammation and oncogenesis. Clinical studies have reported increased ATX expression in chronic hepatitis C, however, the pathways regulating ATX and its role in the viral life cycle are not well understood...
January 23, 2017: Journal of Hepatology
https://www.readbyqxmd.com/read/28125040/silymarin-silybin-and-chronic-liver-disease-a-marriage-of-many-years
#19
REVIEW
Alessandro Federico, Marcello Dallio, Carmelina Loguercio
Silymarin is the extract of Silybum marianum, or milk thistle, and its major active compound is silybin, which has a remarkable biological effect. It is used in different liver disorders, particularly chronic liver diseases, cirrhosis and hepatocellular carcinoma, because of its antioxidant, anti-inflammatory and antifibrotic power. Indeed, the anti-oxidant and anti-inflammatory effect of silymarin is oriented towards the reduction of virus-related liver damages through inflammatory cascade softening and immune system modulation...
January 24, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28112725/erratum-tuning-a-cellular-lipid-kinase-activity-adapts-hepatitis-c-virus-to-replication-in-cell-culture
#20
Christian Harak, Max Meyrath, Inés Romero-Brey, Christian Schenk, Claire Gondeau, Philipp Schult, Katharina Esser-Nobis, Mohsan Saeed, Petra Neddermann, Paul Schnitzler, Daniel Gotthardt, Sofia Perez-Del-Pulgar, Christoph Neumann-Haefelin, Robert Thimme, Philip Meuleman, W R Vondran Florian, Raffaele De Francesco, Charles M Rice, Ralf Bartenschlager, Volker Lohmann
No abstract text is available yet for this article.
January 23, 2017: Nature Microbiology
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