1
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Zhang S, Cao Y, Xu C, Wang G, Huang Y, Bao W, Zhang S. Integrated metabolomics and transcriptomics analyses reveal metabolic responses to TGEV infection in porcine intestinal epithelial cells. J Gen Virol 2023; 104. [PMID: 38116760 DOI: 10.1099/jgv.0.001942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023] Open
Abstract
Transmissible gastroenteritis virus (TGEV) is a coronavirus that infects piglets with severe diarrhoea, vomiting, dehydration, and even death, causing huge economic losses to the pig industry. The underlying pathogenesis of TGEV infection and the effects of TGEV infection on host metabolites remain poorly understood. To investigate the critical metabolites and regulatory factors during TGEV infection in intestinal porcine epithelial cells (IPEC-J2), we performed metabolomic and transcriptomic analyses of TGEV-infected IPEC-J2 cells by LC/MS and RNA-seq techniques. A total of 87 differential metabolites and 489 differentially expressed genes were detected. A series of metabolites and candidate genes from glutathione metabolism and AMPK signalling pathway were examined through combined analysis of metabolome and transcriptome. We found glutathione peroxidase 3 (GPX3) is markedly reduced after TGEV infection, and a significant negative correlation between AMPK signalling pathway and TGEV infection. Exogenous addition of the AMPK activator COH-SR4 significantly downregulates stearoyl coenzyme A (SCD1) mRNA and inhibits TGEV replication; while exogenous GSK-690693 significantly promotes TGEV infection by inhibiting AMPK signalling pathway. In summary, our study provides insights into the key metabolites and regulators for TGEV infection from the metabolome and transcriptome perspective, which will offer promising antiviral metabolic and molecular targets and enrich the understanding of the existence of a similar mechanism in the host.
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Affiliation(s)
- Shuoshuo Zhang
- Key Laboratory for Animal Genetics, Breeding, Reproduction and Molecular Design, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, PR China
| | - Yanan Cao
- Key Laboratory for Animal Genetics, Breeding, Reproduction and Molecular Design, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, PR China
| | - Chao Xu
- Key Laboratory for Animal Genetics, Breeding, Reproduction and Molecular Design, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, PR China
| | - Guangzheng Wang
- Key Laboratory for Animal Genetics, Breeding, Reproduction and Molecular Design, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, PR China
| | - Yanjie Huang
- Key Laboratory for Animal Genetics, Breeding, Reproduction and Molecular Design, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, PR China
| | - Wenbin Bao
- Key Laboratory for Animal Genetics, Breeding, Reproduction and Molecular Design, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, PR China
- Joint International Research Laboratory of Agriculture and Agri-product Safety, Yangzhou University, Yangzhou 225009, PR China
| | - Shuai Zhang
- Key Laboratory for Animal Genetics, Breeding, Reproduction and Molecular Design, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, PR China
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2
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Janikiewicz J, Dobosz AM, Majzner K, Bernas T, Dobrzyn A. Stearoyl-CoA desaturase 1 deficiency exacerbates palmitate-induced lipotoxicity by the formation of small lipid droplets in pancreatic β-cells. Biochim Biophys Acta Mol Basis Dis 2023; 1869:166711. [PMID: 37054998 DOI: 10.1016/j.bbadis.2023.166711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 03/28/2023] [Accepted: 03/30/2023] [Indexed: 04/15/2023]
Abstract
The accelerating accumulation of surplus lipids in the pancreas triggers structural and functional changes in type 2 diabetes-affected islets. Pancreatic β-cells exhibit a restricted capacity to store fat reservoirs in lipid droplets (LDs), which act as transient buffers to prevent lipotoxic stress. With the increasing incidence of obesity, growing interest has been seen in the intracellular regulation of LD metabolism for β-cell function. Stearoyl-CoA desaturase 1 (SCD1) is critical for producing unsaturated fatty acyl moieties for fluent storage into and out of LDs, likely affecting the overall rate of β-cell survival. We explored LD-associated composition and remodeling in SCD1-deprived INS-1E cells and in pancreatic islets in wildtype and SCD1-/- mice in the lipotoxic milieu. Deficiency in the enzymatic activity of SCD1 led to decrease in the size and number of LDs and the lower accumulation of neutral lipids. This occurred in parallel with a higher compactness and lipid order inside LDs, followed by changes in the saturation status and composition of fatty acids within core lipids and the phospholipid coat. The lipidome of LDs was enriched in 18:2n-6 and 20:4n-6 in β-cells and pancreatic islets. These rearrangements markedly contributed to differences in protein association with the LD surface. Our findings highlight an unexpected molecular mechanism by which SCD1 activity affects the morphology, composition and metabolism of LDs. We demonstrate that SCD1-dependent disturbances in LD enrichment can impact proper pancreatic β-cells and islet functioning, which may have considerable therapeutic value for the management of type 2 diabetes.
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Affiliation(s)
- Justyna Janikiewicz
- Laboratory of Cell Signaling and Metabolic Disorders, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland.
| | - Aneta M Dobosz
- Laboratory of Cell Signaling and Metabolic Disorders, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Katarzyna Majzner
- Faculty of Chemistry, Jagiellonian University, Cracow, Poland; Jagiellonian University, Jagiellonian Centre for Experimental Therapeutics (JCET), Cracow, Poland
| | - Tytus Bernas
- Department of Anatomy and Neurobiology, Virginia Commonwealth University School of Medicine, Richmond, USA
| | - Agnieszka Dobrzyn
- Laboratory of Cell Signaling and Metabolic Disorders, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland.
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3
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An Update on the Metabolic Landscape of Oncogenic Viruses. Cancers (Basel) 2022; 14:cancers14235742. [PMID: 36497226 PMCID: PMC9738352 DOI: 10.3390/cancers14235742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 11/10/2022] [Accepted: 11/17/2022] [Indexed: 11/24/2022] Open
Abstract
Viruses play an important role in cancer development as about 12% of cancer types are linked to viral infections. Viruses that induce cellular transformation are known as oncoviruses. Although the mechanisms of viral oncogenesis differ between viruses, all oncogenic viruses share the ability to establish persistent chronic infections with no obvious symptoms for years. During these prolonged infections, oncogenic viruses manipulate cell signaling pathways that control cell cycle progression, apoptosis, inflammation, and metabolism. Importantly, it seems that most oncoviruses depend on these changes for their persistence and amplification. Metabolic changes induced by oncoviruses share many common features with cancer metabolism. Indeed, viruses, like proliferating cancer cells, require increased biosynthetic precursors for virion production, need to balance cellular redox homeostasis, and need to ensure host cell survival in a given tissue microenvironment. Thus, like for cancer cells, viral replication and persistence of infected cells frequently depend on metabolic changes. Here, we draw parallels between metabolic changes observed in cancers or induced by oncoviruses, with a focus on pathways involved in the regulation of glucose, lipid, and amino acids. We describe whether and how oncoviruses depend on metabolic changes, with the perspective of targeting them for antiviral and onco-therapeutic approaches in the context of viral infections.
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4
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Casorla-Perez LA, Guennoun R, Cubillas C, Peng B, Kornfeld K, Wang D. Orsay Virus Infection of Caenorhabditis elegans Is Modulated by Zinc and Dependent on Lipids. J Virol 2022; 96:e0121122. [PMID: 36342299 PMCID: PMC9682997 DOI: 10.1128/jvi.01211-22] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 10/16/2022] [Indexed: 11/09/2022] Open
Abstract
Viruses utilize host lipids to promote the viral life cycle, but much remains unknown as to how this is regulated. Zinc is a critical element for life, and few studies have linked zinc to lipid homeostasis. We demonstrated that Caenorhabditis elegans infection by Orsay virus is dependent upon lipids and that mutation of the master regulator of lipid biosynthesis, sbp-1, reduced Orsay virus RNA levels by ~236-fold. Virus infection could be rescued by dietary supplementation with lipids downstream of fat-6/fat-7. Mutation of a zinc transporter encoded by sur-7, which suppresses the lipid defect of sbp-1, also rescued Orsay virus infection. Furthermore, reducing zinc levels by chemical chelation in the sbp-1 mutant also increased lipids and rescued Orsay virus RNA levels. Finally, increasing zinc levels by dietary supplementation led to an ~1,620-fold reduction in viral RNA. These findings provide insights into the critical interactions between zinc and host lipids necessary for virus infection. IMPORTANCE Orsay virus is the only known natural virus pathogen of Caenorhabditis elegans, which shares many evolutionarily conserved pathways with humans. We leveraged the powerful genetic tractability of C. elegans to characterize a novel interaction between zinc, lipids, and virus infection. Inhibition of the Orsay virus replication in the sbp-1 mutant animals, explained by the lipid depletion, can be rescued by a genetic and pharmacological approach that reduces the zinc accumulation and rescues the lipid levels in this mutant animal. Interestingly, the human ortholog of sbp-1, srebp-1, has been reported to play a role for virus infection, and zinc has been shown to inhibit the virus replication of multiple viruses. However, the mechanism through which zinc is acting is not well understood. These results suggest that the lipid regulation mediated by zinc may play a relevant role during mammalian virus infection.
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Affiliation(s)
| | - Ranya Guennoun
- Department of Molecular Microbiology, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Ciro Cubillas
- Department of Molecular Microbiology, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Bo Peng
- Department of Molecular Microbiology, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Kerry Kornfeld
- Developmental Biology, School of Medicine, Washington University in St. Louis, St. Louis, Missouri, USA
| | - David Wang
- Department of Molecular Microbiology, Washington University in St. Louis, St. Louis, Missouri, USA
- Department Pathology & Immunology, Washington University in St. Louis, St. Louis, Missouri, USA
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5
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Stearoyl-CoA desaturase 1 as a therapeutic target for cancer: a focus on hepatocellular carcinoma. Mol Biol Rep 2022; 49:8871-8882. [PMID: 35906508 DOI: 10.1007/s11033-021-07094-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 12/16/2021] [Indexed: 01/14/2023]
Abstract
One of the main characteristics of cancer cells is the alteration in lipid composition, which is associated with a significant monounsaturated fatty acids (MUFAs) enrichment. In addition to their structural functions in newly synthesized membranes in proliferating cancer cells, these fatty acids are involved in tumorigenic signaling. Increased expression and activity of stearoyl CoA desaturase (SCD1), i.e., an enzyme converting saturated fatty acids to Δ9-monounsaturated fatty acids, has been observed in various cancer cells. This increase in expression and activity has also been associated with cancer aggressiveness and poor patient outcome. Previous studies have also indicated the SCD1 involvement in increased cancer cells proliferation, growth, migration, epithelial to mesenchymal transition, metastasis, chemoresistance, and maintenance of cancer stem cells properties. Hence, SCD1 seems to be a player in malignancy development and may be considered a novel therapeutic target in cancers, including hepatocellular carcinoma (HCC). This review study aims to discuss the impact of SCD1 as a major component in lipid signaling in HCC.
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6
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Nigam S, Ranjan R, Sinha N, Ateeq B. Nuclear magnetic resonance spectroscopy reveals dysregulation of monounsaturated fatty acid metabolism upon SPINK1 attenuation in colorectal cancer. NMR IN BIOMEDICINE 2022; 35:e4705. [PMID: 35102613 DOI: 10.1002/nbm.4705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 01/21/2022] [Accepted: 01/24/2022] [Indexed: 06/14/2023]
Abstract
Metabolic reprogramming, a key hallmark of cancer, plays a pivotal role in fulfilling the accelerated biological demands of tumor cells. Such metabolic changes trigger the production of several proinflammatory factors, thereby inciting cancer development and its progression. Serine protease inhibitor Kazal Type 1 (SPINK1), well known for its oncogenic role and its upregulation via acute-phase reactions, is highly expressed in multiple cancers including colorectal cancer (CRC). Here, we show accumulation of lipid droplets in CRC cells stained with Oil Red O upon SPINK1 silencing. Furthermore, NMR spectroscopy analysis revealed an accretion of monounsaturated fatty acids (MUFAs) and phosphatidylcholine in these CRC cells, while the levels of polyunsaturated fatty acids remained unaltered. This alteration indicates the presence of MUFAs with the triglycerides in the lipid droplets as observed in SPINK1-silenced CRC cells. Considering the role of MUFAs in the anti-inflammatory response, our data hint that suppression of SPINK1 in CRC leads to activation of an anti-inflammatory signaling milieu. Conclusively, our study uncovers a connection between lipid metabolism and SPINK1-mediated CRC progression, hence paving the way for further exploration and better prognosis of SPINK1-positive CRC patients.
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Affiliation(s)
- Shivansh Nigam
- Molecular Oncology Laboratory, Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur, India
| | - Renuka Ranjan
- Department of Advanced Spectroscopy and Imaging, Centre of Biomedical Research, Lucknow, India
| | - Neeraj Sinha
- Department of Advanced Spectroscopy and Imaging, Centre of Biomedical Research, Lucknow, India
| | - Bushra Ateeq
- Molecular Oncology Laboratory, Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur, India
- The Mehta Family Center for Engineering in Medicine, Indian Institute of Technology Kanpur, Kanpur, India
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7
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Bulankina AV, Richter RM, Welsch C. Regulatory Role of Phospholipids in Hepatitis C Virus Replication and Protein Function. Pathogens 2022; 11:102. [PMID: 35056049 PMCID: PMC8779051 DOI: 10.3390/pathogens11010102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 01/12/2022] [Accepted: 01/13/2022] [Indexed: 11/16/2022] Open
Abstract
Positive-strand RNA viruses such as hepatitis C virus (HCV) hijack key factors of lipid metabolism of infected cells and extensively modify intracellular membranes to support the viral lifecycle. While lipid metabolism plays key roles in viral particle assembly and maturation, viral RNA synthesis is closely linked to the remodeling of intracellular membranes. The formation of viral replication factories requires a number of interactions between virus proteins and host factors including lipids. The structure-function relationship of those proteins is influenced by their lipid environments and lipids that selectively modulate protein function. Here, we review our current understanding on the roles of phospholipids in HCV replication and of lipid-protein interactions in the structure-function relationship of the NS5A protein. NS5A is a key factor in membrane remodeling in HCV-infected cells and is known to recruit phosphatidylinositol 4-kinase III alpha to generate phosphatidylinositol 4-phosphate at the sites of replication. The dynamic interplay between lipids and viral proteins within intracellular membranes is likely key towards understanding basic mechanisms in the pathobiology of virus diseases, the mode of action of specific antiviral agents and related drug resistance mechanisms.
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Affiliation(s)
- Anna V. Bulankina
- Department of Internal Medicine 1, Goethe University Hospital Frankfurt, 60590 Frankfurt, Germany; (A.V.B.); (R.M.R.)
- Research Group “Molecular Evolution & Adaptation”, 60590 Frankfurt, Germany
| | - Rebecca M. Richter
- Department of Internal Medicine 1, Goethe University Hospital Frankfurt, 60590 Frankfurt, Germany; (A.V.B.); (R.M.R.)
- Research Group “Molecular Evolution & Adaptation”, 60590 Frankfurt, Germany
| | - Christoph Welsch
- Department of Internal Medicine 1, Goethe University Hospital Frankfurt, 60590 Frankfurt, Germany; (A.V.B.); (R.M.R.)
- Research Group “Molecular Evolution & Adaptation”, 60590 Frankfurt, Germany
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8
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PPAR Ligands Induce Antiviral Effects Targeting Perturbed Lipid Metabolism during SARS-CoV-2, HCV, and HCMV Infection. BIOLOGY 2022; 11:biology11010114. [PMID: 35053112 PMCID: PMC8772958 DOI: 10.3390/biology11010114] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/07/2022] [Accepted: 01/10/2022] [Indexed: 12/24/2022]
Abstract
Simple Summary The current coronavirus disease 2019 pandemic turned the attention of researchers to developing novel strategies to counteract virus infections. Despite several antiviral drugs being commercially available, there is an urgent need to identify novel molecules efficacious against viral infections that act through different mechanisms of action. In this context, our attention is focused on novel compounds acting on nuclear receptors, whose activity could be beneficial in viral infections, including coronavirus, hepatitis C virus, and cytomegalovirus. Abstract The manipulation of host metabolisms by viral infections has been demonstrated by several studies, with a marked influence on the synthesis and utilization of glucose, nucleotides, fatty acids, and amino acids. The ability of virus to perturb the metabolic status of the infected organism is directly linked to the outcome of the viral infection. A great deal of research in recent years has been focusing on these metabolic aspects, pointing at modifications induced by virus, and suggesting novel strategies to counteract the perturbed host metabolism. In this review, our attention is turned on PPARs, nuclear receptors controlling multiple metabolic actions, and on the effects played by PPAR ligands during viral infections. The role of PPAR agonists and antagonists during SARS-CoV-2, HCV, and HCMV infections will be analyzed.
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Eloiflin RJ, Auray G, Python S, Rodrigues V, Seveno M, Urbach S, El Koulali K, Holzmuller P, Totte P, Libeau G, Bataille A, Summerfield A. Identification of Differential Responses of Goat PBMCs to PPRV Virulence Using a Multi-Omics Approach. Front Immunol 2021; 12:745315. [PMID: 34671358 PMCID: PMC8521192 DOI: 10.3389/fimmu.2021.745315] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 09/14/2021] [Indexed: 12/02/2022] Open
Abstract
Peste des petits ruminants (PPR) is an acute transboundary infectious viral disease of small ruminants, mainly sheep and goats. Host susceptibility varies considerably depending on the PPR virus (PPRV) strain, the host species and breed. The effect of strains with different levels of virulence on the modulation of the immune system has not been thoroughly compared in an experimental setting so far. In this study, we used a multi-omics approach to investigate the host cellular factors involved in different infection phenotypes. Peripheral blood mononuclear cells (PBMCs) from Saanen goats were activated with a T-cell mitogen and infected with PPRV strains of different virulence: Morocco 2008 (high virulence), Ivory Coast 1989 (low virulence) and Nigeria 75/1 (live attenuated vaccine strain). Our results showed that the highly virulent strain replicated better than the other two in PBMCs and rapidly induced cell death and a stronger inhibition of lymphocyte proliferation. However, all the strains affected lymphocyte proliferation and induced upregulation of key antiviral genes and proteins, meaning a classical antiviral response is orchestrated regardless of the virulence of the PPRV strain. On the other hand, the highly virulent strain induced stronger inflammatory responses and activated more genes related to lymphocyte migration and recruitment, and inflammatory processes. Both transcriptomic and proteomic approaches were successful in detecting viral and antiviral effectors under all conditions. The present work identified key immunological factors related to PPRV virulence in vitro.
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Affiliation(s)
- Roger-Junior Eloiflin
- CIRAD (Agricultural Research Centre for International Development), UMR (Unité Mixte de Recherche), ASTRE (Animal, Health, Territories, Risks and Ecosystems), Montpellier, France.,ASTRE (Animal, Health, Territories, Risks and Ecosystems), University of Montpellier, CIRAD (Agricultural Research Centre for International Development), INRAE (Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement), Montpellier, France
| | - Gaël Auray
- Institute of Virology and Immunology, Mittelhäusern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Sylvie Python
- Institute of Virology and Immunology, Mittelhäusern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Valérie Rodrigues
- ASTRE (Animal, Health, Territories, Risks and Ecosystems), University of Montpellier, CIRAD (Agricultural Research Centre for International Development), INRAE (Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement), Montpellier, France.,CIRAD (Agricultural Research Centre for International Development), UMR (Unité Mixte de Recherche), ASTRE (Animal, Health, Territories, Risks and Ecosystems), Petit-Bourg, France
| | - Martial Seveno
- BCM (BioCampus Montpellier), Univ. Montpellier, CNRS (Centre national de la recherche scientifique), INSERM, Montpellier, France
| | - Serge Urbach
- IGF (Institut de Génomique Fonctionnelle), Univ. Montpellier, CNRS (Centre national de la recherche scientifique), INSERM, Montpellier, France
| | - Khadija El Koulali
- BCM (BioCampus Montpellier), Univ. Montpellier, CNRS (Centre national de la recherche scientifique), INSERM, Montpellier, France
| | - Philippe Holzmuller
- CIRAD (Agricultural Research Centre for International Development), UMR (Unité Mixte de Recherche), ASTRE (Animal, Health, Territories, Risks and Ecosystems), Montpellier, France.,ASTRE (Animal, Health, Territories, Risks and Ecosystems), University of Montpellier, CIRAD (Agricultural Research Centre for International Development), INRAE (Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement), Montpellier, France
| | - Philippe Totte
- CIRAD (Agricultural Research Centre for International Development), UMR (Unité Mixte de Recherche), ASTRE (Animal, Health, Territories, Risks and Ecosystems), Montpellier, France.,ASTRE (Animal, Health, Territories, Risks and Ecosystems), University of Montpellier, CIRAD (Agricultural Research Centre for International Development), INRAE (Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement), Montpellier, France
| | - Genevieve Libeau
- CIRAD (Agricultural Research Centre for International Development), UMR (Unité Mixte de Recherche), ASTRE (Animal, Health, Territories, Risks and Ecosystems), Montpellier, France.,ASTRE (Animal, Health, Territories, Risks and Ecosystems), University of Montpellier, CIRAD (Agricultural Research Centre for International Development), INRAE (Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement), Montpellier, France
| | - Arnaud Bataille
- CIRAD (Agricultural Research Centre for International Development), UMR (Unité Mixte de Recherche), ASTRE (Animal, Health, Territories, Risks and Ecosystems), Montpellier, France.,ASTRE (Animal, Health, Territories, Risks and Ecosystems), University of Montpellier, CIRAD (Agricultural Research Centre for International Development), INRAE (Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement), Montpellier, France
| | - Artur Summerfield
- Institute of Virology and Immunology, Mittelhäusern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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10
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Yamane D, Hayashi Y, Matsumoto M, Nakanishi H, Imagawa H, Kohara M, Lemon SM, Ichi I. FADS2-dependent fatty acid desaturation dictates cellular sensitivity to ferroptosis and permissiveness for hepatitis C virus replication. Cell Chem Biol 2021; 29:799-810.e4. [PMID: 34520742 DOI: 10.1016/j.chembiol.2021.07.022] [Citation(s) in RCA: 54] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/28/2021] [Accepted: 07/29/2021] [Indexed: 01/20/2023]
Abstract
The metabolic oxidative degradation of cellular lipids severely restricts replication of hepatitis C virus (HCV), a leading cause of chronic liver disease, but little is known about the factors regulating this process in infected cells. Here we show that HCV is restricted by an iron-dependent mechanism resembling the one triggering ferroptosis, an iron-dependent form of non-apoptotic cell death, and mediated by the non-canonical desaturation of oleate to Mead acid and other highly unsaturated fatty acids by fatty acid desaturase 2 (FADS2). Genetic depletion and ectopic expression experiments show FADS2 is a key determinant of cellular sensitivity to ferroptosis. Inhibiting FADS2 markedly enhances HCV replication, whereas the ferroptosis-inducing compound erastin alters conformation of the HCV replicase and sensitizes it to direct-acting antiviral agents targeting the viral protease. Our results identify FADS2 as a rate-limiting factor in ferroptosis, and suggest the possibility of pharmacologically manipulating the ferroptosis pathway to attenuate viral replication.
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Affiliation(s)
- Daisuke Yamane
- Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo 156-8506, Japan.
| | - Yuri Hayashi
- Graduate School of Humanities and Sciences, Ochanomizu University, Bunkyō-ku, Tokyo 112-8610, Japan
| | - Moe Matsumoto
- Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo 156-8506, Japan
| | - Hiroki Nakanishi
- Research Center for Biosignaling, Akita University, Akita-city, Akita 010-8543, Japan; Lipidome Lab Co., Ltd, Akita-city, Akita 010-0825, Japan
| | - Haruka Imagawa
- Lipidome Lab Co., Ltd, Akita-city, Akita 010-0825, Japan
| | - Michinori Kohara
- Department of Diseases and Infection, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo 156-8506, Japan
| | - Stanley M Lemon
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7292, USA; Departments of Medicine and Microbiology & Immunology, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7292, USA
| | - Ikuyo Ichi
- Natural Science Division, Ochanomizu University, Bunkyō-ku, Tokyo 112-8610, Japan; Institute for Human Life Innovation, Faculty of Core Research, Ochanomizu University, Bunkyō-ku, Tokyo 112-8610, Japan
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11
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Abstract
The circadian clock controls several aspects of mammalian physiology and orchestrates the daily oscillations of biological processes and behavior. Our circadian rhythms are driven by an endogenous central clock in the brain that synchronizes with clocks in peripheral tissues, thereby regulating our immune system and the severity of infections. These rhythms affect the pharmacokinetics and efficacy of therapeutic agents and vaccines. The core circadian regulatory circuits and clock-regulated host pathways provide fertile ground to identify novel antiviral therapies. An increased understanding of the role circadian systems play in regulating virus infection and the host response to the virus will inform our clinical management of these diseases. This review provides an overview of the experimental and clinical evidence reporting on the interplay between the circadian clock and viral infections, highlighting the importance of virus-clock research.
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Affiliation(s)
- Helene Borrmann
- Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
| | | | - Xiaodong Zhuang
- Xiaodong Zhuang, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7FZ, UK; e-mail:
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12
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Filip R, Desrochers GF, Lefebvre DM, Reed A, Singaravelu R, Cravatt BF, Pezacki JP. Profiling of MicroRNA Targets Using Activity-Based Protein Profiling: Linking Enzyme Activity to MicroRNA-185 Function. Cell Chem Biol 2021; 28:202-212.e6. [PMID: 33450181 DOI: 10.1016/j.chembiol.2020.12.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 11/06/2020] [Accepted: 12/18/2020] [Indexed: 02/08/2023]
Abstract
MicroRNAs (miRNAs) act as cellular signal transducers through repression of protein translation. Elucidating targets using bioinformatics and traditional quantitation methods is often insufficient to uncover global miRNA function. Herein, alteration of protein function caused by miRNA-185 (miR-185), an immunometabolic miRNA, was determined using activity-based protein profiling, transcriptomics, and lipidomics. Fluorophosphonate-based activity-based protein profiling of miR-185-induced changes to human liver cells revealed that exclusively metabolic serine hydrolase enzymes were regulated in activity, some with roles in lipid and endocannabinoid metabolism. Lipidomic analysis linked enzymatic changes to levels of cellular lipid species, such as components of very-low-density lipoprotein particles. Additionally, inhibition of one miR-185 target, monoglyceride lipase, led to decreased hepatitis C virus levels in an infectious model. Overall, the approaches used here were able to identify key functional changes in serine hydrolases caused by miR-185 that are targetable pharmacologically, such that a small molecule inhibitor can recapitulate the miRNA phenotype.
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Affiliation(s)
- Roxana Filip
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa K1N 6N5, Canada
| | - Geneviève F Desrochers
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa K1N 6N5, Canada
| | - David M Lefebvre
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa K1N 6N5, Canada
| | - Alex Reed
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Ragunath Singaravelu
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa K1N 6N5, Canada
| | - Benjamin F Cravatt
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - John Paul Pezacki
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa K1N 6N5, Canada.
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13
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Remodeling Lipids in the Transition from Chronic Liver Disease to Hepatocellular Carcinoma. Cancers (Basel) 2020; 13:cancers13010088. [PMID: 33396945 PMCID: PMC7795670 DOI: 10.3390/cancers13010088] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 12/18/2020] [Accepted: 12/24/2020] [Indexed: 12/14/2022] Open
Abstract
Simple Summary Hepatocellular carcinoma (HCC) has poor prognosis. We studied blood lipids by comparing healthy volunteers to patients with chronic liver disease (CLD), and to patients with HCC caused by viral infections. We contrasted our findings in blood to lipid alterations in liver tumor and nontumor tissue samples from HCC patients. In blood, most lipid species were found at increased levels in CLD patients compared to healthy volunteers. This trend was mostly reversed in HCC versus CLD patients. In liver tumor tissues, levels of many lipids were decreased compared to paired nontumor liver tissues. Differences in lipid levels were further defined by alterations in the degree of saturation in the fatty acyl chains. Some lipids, including free fatty acids, saturated lysophosphatidylcholines and saturated triacylglycerides, showed a continuous trend in the transition from the blood of healthy controls to CLD and HCC patients. For HCC patients, phosphatidylglycerides showed similar alterations in both blood and tissues. Abstract Hepatocellular carcinoma (HCC) is a worldwide health problem. HCC patients show a 50% mortality within two years of diagnosis. To better understand the molecular pathogenesis at the level of lipid metabolism, untargeted UPLC MS—QTOF lipidomics data were acquired from resected human HCC tissues and their paired nontumor hepatic tissues (n = 46). Blood samples of the same HCC subjects (n = 23) were compared to chronic liver disease (CLD) (n = 15) and healthy control (n = 15) blood samples. The participants were recruited from the National Liver Institute in Egypt. The lipidomics data yielded 604 identified lipids that were divided into six super classes. Five-hundred and twenty-four blood lipids were found as significantly differentiated (p < 0.05 and qFDR p < 0.1) between the three study groups. In the blood of CLD patients compared to healthy control subjects, almost all lipid classes were significantly upregulated. In CLD patients, triacylglycerides were found as the most significantly upregulated lipid class at qFDR p = 1.3 × 10−56, followed by phosphatidylcholines at qFDR p = 3.3 × 10−51 and plasmalogens at qFDR p = 1.8 × 10-46. In contrast, almost all blood lipids were significantly downregulated in HCC patients compared to CLD patients, and in HCC tissues compared to nontumor hepatic tissues. Ceramides were found as the most significant lipid class (qFDR p = 1 × 10−14) followed by phosphatidylglycerols (qFDR p = 3 × 10−9), phosphatidylcholines and plasmalogens. Despite these major differences, there were also common trends in the transitions between healthy controls, CLD and HCC patients. In blood, several mostly saturated triacylglycerides showed a continued increase in the trajectory towards HCC, accompanied by reduced levels of saturated free fatty acids and saturated lysophospatidylcholines. In contrast, the largest overlaps of lipid alterations that were found in both HCC tissue and blood comparisons were decreased levels of phosphatidylglycerols and sphingolipids. This study highlights the specific impact of HCC tumors on the circulating lipids. Such data may be used to target lipid metabolism for prevention, early detection and treatment of HCC in the background of viral-related CLD etiology.
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14
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Inositol-Requiring Enzyme 1α Promotes Zika Virus Infection through Regulation of Stearoyl Coenzyme A Desaturase 1-Mediated Lipid Metabolism. J Virol 2020; 94:JVI.01229-20. [PMID: 32967957 DOI: 10.1128/jvi.01229-20] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 09/10/2020] [Indexed: 12/17/2022] Open
Abstract
Zika virus (ZIKV) is an emerging mosquito-borne flavivirus which has become a global epidemic threat due to its rapid spread and association with serious consequences of infection, including neonatal microcephaly. Inositol-requiring enzyme 1α (IRE1α) is an endoplasmic reticulum (ER)-related transmembrane protein that mediates unfolded protein response (UPR) pathway and has been indicated to play an important role in flavivirus replication. However, the mechanism of how IRE1α affects ZIKV replication remains unknown. In this study, we explored the role of IRE1α in ZIKV infection in vitro and in vivo by using CRISPR/Cas9-based gene knockout and RNA interference-based gene knockdown techniques. Both knockout and knockdown of IRE1α dramatically reduced ZIKV replication levels, including viral RNA levels, protein expression, and titers in different human cell lines. Trans-complementation with IRE1α restored viral replication levels decreased by IRE1α depletion. Furthermore, the proviral effect of IRE1α was dependent on its kinase and RNase activities. Importantly, we found that IRE1α promoted the replication of ZIKV through upregulating the accumulation of monounsaturated fatty acid (MUFA) rate-limiting enzyme stearoyl coenzyme A (stearoyl-CoA) desaturase 1 (SCD1), which further affected the production of oleic acid (OA) and lipid droplet. Finally, our data demonstrated that in the brain tissues of ZIKV-infected mice, the replication levels of ZIKV and virus-related lesions were significantly suppressed by both the kinase and RNase inhibitors of IRE1α. Taken together, our results identified IRE1α as a ZIKV dependency factor which promotes viral replication through affecting SCD1-mediated lipid metabolism, potentially providing a novel molecular target for the development of anti-ZIKV agents.IMPORTANCE Zika virus (ZIKV) has been linked to serious neurologic disorders and causes widespread concern in the field of global public health. Inositol requiring enzyme 1α (IRE1α) is an ER-related transmembrane protein that mediates unfolded protein response (UPR) pathway. Here, we revealed that IRE1α is a proviral factor for ZIKV replication both in culture cells and mice model, which relies on its kinase and RNase activities. Importantly, we further provided evidence that upon ZIKV infection, IRE1α is activated and splices XBP1 mRNA which enhances the expression of monounsaturated fatty acids rate-limiting enzyme stearoyl coenzyme A (stearoyl-CoA) desaturase 1 (SCD1) and subsequent lipid droplet production. Our data uncover a novel mechanism of IRE1α proviral effect by modulating lipid metabolism, providing the first evidence of a close relationship between IRE1α-mediated UPR, lipid metabolism, and ZIKV replication and indicating IRE1α inhibitors as potentially effective anti-ZIKV agents.
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15
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Li C, Lu L, Qi Z, Zhu Y, Su F, Zhao P, Dong H. Transcriptome and miRNome Analysis Provide New Insight Into Host Lipid Accumulation, Innate Immunity, and Viral Persistence in Hepatitis C Virus Infection in vitro. Front Microbiol 2020; 11:535673. [PMID: 33101221 PMCID: PMC7555709 DOI: 10.3389/fmicb.2020.535673] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 09/14/2020] [Indexed: 12/17/2022] Open
Abstract
Hepatitis C virus (HCV)-host cell interaction during infection disturbs cellular homeostasis and culminates in pathological consequences. The processes could be first embodied in gene expression of HCV-infected cells. Here, we investigated transcriptome and miRNA expression (miRNome) alterations in HCV-infected Huh7 cells at 12, 36, and 60 h after infection to systematically explore host responses. The number of deregulated genes in the HCV-infected cells increased with infection duration. The altered biological processes at 36 h were mainly associated with stress and inflammatory response, whereas the most enriched processes at 60 h were predominantly linked to lipid metabolism. Notably, the key genes that participated in lipogenesis were downregulated, and conversely, the genes implicated in fatty acid beta-oxidation were upregulated. Reduced expression of the key genes involved in lipoprotein assembly and secretion pointed to a decreased requirement for and export of lipids, leading to lipid accumulation in HCV-infected hepatocytes. Fluctuation in the expression of host factors, innate immunity genes and transcription factors provided insight into host-directed mechanisms to control viral replication. Furthermore, miRNome presented a comprehensive expression profile of miRNAs in HCV-infected Huh7 cells. The integrated analysis of transcriptome and miRNome suggested that deregulated miR-483, miR-1303, miR-1260a, miR-27a∗, and miR-21∗ directly regulated lipid metabolical genes at 60 h. The decreased miR-122 at 60 h was indirectly involved in lipid metabolism and is expected to attenuate rampant replication of HCV and potentially contribute to viral persistence. Our results will help to gain a comprehensive understanding of the molecular mechanisms implicated in HCV-induced pathogenesis.
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Affiliation(s)
- Chong Li
- Cancer Institute, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Lungen Lu
- Shanghai Key Laboratory of Pancreatic Diseases, Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhongtian Qi
- Department of Microbiology, Second Military Medical University, Shanghai, China
| | - Yongqiang Zhu
- Chinese National Human Genome Center at Shanghai, Shanghai, China
| | - Fengtao Su
- Cancer Institute, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Ping Zhao
- Department of Microbiology, Second Military Medical University, Shanghai, China
| | - Hui Dong
- Shanghai Key Laboratory of Pancreatic Diseases, Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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16
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Abstract
Viruses manipulate cellular lipids and membranes at each stage of their life cycle. This includes lipid-receptor interactions, the fusion of viral envelopes with cellular membranes during endocytosis, the reorganization of cellular membranes to form replication compartments, and the envelopment and egress of virions. In addition to the physical interactions with cellular membranes, viruses have evolved to manipulate lipid signaling and metabolism to benefit their replication. This review summarizes the strategies that viruses use to manipulate lipids and membranes at each stage in the viral life cycle.
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Affiliation(s)
- Ellen Ketter
- Department of Microbiology, The University of Chicago, Chicago, Illinois 60637, USA;
| | - Glenn Randall
- Department of Microbiology, The University of Chicago, Chicago, Illinois 60637, USA;
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17
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Very-long-chain fatty acid metabolic capacity of 17-beta-hydroxysteroid dehydrogenase type 12 (HSD17B12) promotes replication of hepatitis C virus and related flaviviruses. Sci Rep 2020; 10:4040. [PMID: 32132633 PMCID: PMC7055353 DOI: 10.1038/s41598-020-61051-w] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Accepted: 02/10/2020] [Indexed: 12/17/2022] Open
Abstract
Flaviviridae infections represent a major global health burden. By deciphering mechanistic aspects of hepatitis C virus (HCV)-host interactions, one could discover common strategy for inhibiting the replication of related flaviviruses. By elucidating the HCV interactome, we identified the 17-beta-hydroxysteroid dehydrogenase type 12 (HSD17B12) as a human hub of the very-long-chain fatty acid (VLCFA) synthesis pathway and core interactor. Here we show that HSD17B12 knockdown (KD) impairs HCV replication and reduces virion production. Mechanistically, depletion of HSD17B12 induces alterations in VLCFA-containing lipid species and a drastic reduction of lipid droplets (LDs) that play a critical role in virus assembly. Oleic acid supplementation rescues viral RNA replication and production of infectious particles in HSD17B12 depleted cells, supporting a specific role of VLCFA in HCV life cycle. Furthermore, the small-molecule HSD17B12 inhibitor, INH-12, significantly reduces replication and infectious particle production of HCV as well as dengue virus and Zika virus revealing a conserved requirement across Flaviviridae virus family. Overall, the data provide a strong rationale for the advanced evaluation of HSD17B12 inhibition as a promising broad-spectrum antiviral strategy for the treatment of Flaviviridae infections.
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18
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Li X, Li J, Feng Y, Cai H, Li YP, Peng T. Long-chain fatty acyl-coenzyme A suppresses hepatitis C virus infection by targeting virion-bound lipoproteins. Antiviral Res 2020; 177:104734. [PMID: 32057770 DOI: 10.1016/j.antiviral.2020.104734] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 12/18/2019] [Accepted: 02/03/2020] [Indexed: 12/12/2022]
Abstract
Hepatitis C virus (HCV) is a leading cause of chronic hepatitis and end-stage liver diseases. Mature HCV virions are bound by host-derived lipoproteins. Lack of an HCV vaccine warrants a major role of antiviral treatment in the global elimination of hepatitis C. Although direct-acting antivirals (DAAs) are replacing the interferon-based treatment and have dramatically improved the cure rate, the presence of viral variants resistant to DAAs, HCV genotype/subtype-specific efficacy, and high cost of DAAs argue novel and affordable regimens. In this study, we identified the antiviral effects of long-chain fatty acyl-coenzyme A (LCFA-CoA) against the infections of HCV genotypes 1-6 through targeting mature HCV-bound lipoproteins, suggesting novel mechanism(s) of antiviral different from those used by host-targeting agents or DAAs. We found that the antiviral activity of LCFA-CoA relied on the long-chain saturated fatty acid and the CoA group, and was enhanced when combined with pegylated-interferon or DAAs. Importantly, we demonstrated that LCFA-CoA efficiently inhibited the infection of HCV variants carrying DAA-resistant mutations. The mechanistic study revealed that LCFA-CoA specifically abolished the attachment and binding steps and also inhibited the cell-to-cell viral transmission. LCFA-CoA targeted mature HCV-bound lipoproteins, but not apolipoproteins B or E. In addition, LCFA-CoA could also inhibit the infection of the dengue virus. Our findings suggest that LCFA-CoA could potentially serve as a supplement HCV therapy, particularly for the DAA-resistant HCV variants. Taken together, LCFA-CoA may be further developed to be a novel class of antivirals with mechanism(s), different from host-targeting agents or DAAs, of targeting the components associated with mature HCV virions.
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Affiliation(s)
- Xinlei Li
- State Key Laboratory of Respiratory Disease, Sino-French Hoffmann Institute, Guangzhou Medical University, Guangzhou, China
| | - Jinqian Li
- Institute of Human Virology, Zhongshan School of Medicine, Key Laboratory of Tropical Disease Control (Sun Yat-sen University), Ministry of Education, Sun Yat-sen University, Guangzhou, 510080, China
| | - Yetong Feng
- Institute of Human Virology, Zhongshan School of Medicine, Key Laboratory of Tropical Disease Control (Sun Yat-sen University), Ministry of Education, Sun Yat-sen University, Guangzhou, 510080, China
| | - Hua Cai
- State Key Laboratory of Respiratory Disease, Sino-French Hoffmann Institute, Guangzhou Medical University, Guangzhou, China
| | - Yi-Ping Li
- Institute of Human Virology, Zhongshan School of Medicine, Key Laboratory of Tropical Disease Control (Sun Yat-sen University), Ministry of Education, Sun Yat-sen University, Guangzhou, 510080, China.
| | - Tao Peng
- State Key Laboratory of Respiratory Disease, Sino-French Hoffmann Institute, Guangzhou Medical University, Guangzhou, China.
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19
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Sterculic Acid: The Mechanisms of Action beyond Stearoyl-CoA Desaturase Inhibition and Therapeutic Opportunities in Human Diseases. Cells 2020; 9:cells9010140. [PMID: 31936134 PMCID: PMC7016617 DOI: 10.3390/cells9010140] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/04/2020] [Accepted: 01/05/2020] [Indexed: 12/12/2022] Open
Abstract
In many tissues, stearoyl-CoA desaturase 1 (SCD1) catalyzes the biosynthesis of monounsaturated fatty acids (MUFAS), (i.e., palmitoleate and oleate) from their saturated fatty acid (SFA) precursors (i.e., palmitate and stearate), influencing cellular membrane physiology and signaling, leading to broad effects on human physiology. In addition to its predominant role in lipid metabolism and body weight control, SCD1 has emerged recently as a potential new target for the treatment for various diseases, such as nonalcoholic steatohepatitis, Alzheimer’s disease, cancer, and skin disorders. Sterculic acid (SA) is a cyclopropene fatty acid originally found in the seeds of the plant Sterculia foetida with numerous biological activities. On the one hand, its ability to inhibit stearoyl-CoA desaturase (SCD) allows its use as a coadjuvant of several pathologies where this enzyme has been associated. On the other hand, additional effects independently of its SCD inhibitory properties, involve anti-inflammatory and protective roles in retinal diseases such as age-related macular degeneration (AMD). This review aims to summarize the mechanisms by which SA exerts its actions and to highlight the emerging areas where this natural compound may be of help for the development of new therapies for human diseases.
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20
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Fatty acid synthase and stearoyl-CoA desaturase-1 are conserved druggable cofactors of Old World Alphavirus genome replication. Antiviral Res 2019; 172:104642. [PMID: 31678479 DOI: 10.1016/j.antiviral.2019.104642] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 10/14/2019] [Accepted: 10/28/2019] [Indexed: 01/12/2023]
Abstract
Chikungunya virus (CHIKV) is a rapidly emerging mosquito-borne RNA virus that causes epidemics of debilitating disease in tropical and sub-tropical regions with autochtonous transmission in regions with temperate climate. Currently, there is no licensed vaccine or specific antiviral drug available against CHIKV infection. In this study, we examine the role, in the CHIKV viral cycle, of fatty acid synthase (FASN) and stearoyl-CoA desaturase (SCD1), two key lipogenic enzymes required for fatty acid production and early desaturation. We show that both enzymes and their upstream regulator PI3K are required for optimal CHIKV infection. We demonstrate that pharmacologic manipulation of FASN or SCD1 enzymatic activity by non-toxic concentrations of cerulenin or CAY10566 decreases CHIKV genome replication. Interestingly, a similar inhibitory effect was also obtained with Orlistat, an FDA-approved anti-obesity drug that targets FASN activity. These drugs were also effective against Mayaro virus (MAYV), an under-studied arthritogenic Old world Alphavirus endemic in South American countries with potential risk of emergence, urbanization and dispersion to other regions. Altogether, our results identify FASN and SCD1 as conserved druggable cofactors of Alphavirus genome replication and support the broad-spectrum activity of drugs targeting the host fatty acids metabolism.
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21
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Mayer KA, Stöckl J, Zlabinger GJ, Gualdoni GA. Hijacking the Supplies: Metabolism as a Novel Facet of Virus-Host Interaction. Front Immunol 2019; 10:1533. [PMID: 31333664 PMCID: PMC6617997 DOI: 10.3389/fimmu.2019.01533] [Citation(s) in RCA: 107] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 06/19/2019] [Indexed: 12/22/2022] Open
Abstract
Viral replication is a process that involves an extremely high turnover of cellular molecules. Since viruses depend on the host cell to obtain the macromolecules needed for their proper replication, they have evolved numerous strategies to shape cellular metabolism and the biosynthesis machinery of the host according to their specific needs. Technologies for the rigorous analysis of metabolic alterations in cells have recently become widely available and have greatly expanded our knowledge of these crucial host–pathogen interactions. We have learned that most viruses enhance specific anabolic pathways and are highly dependent on these alterations. Since uninfected cells are far more plastic in their metabolism, targeting of the virus-induced metabolic alterations is a promising strategy for specific antiviral therapy and has gained great interest recently. In this review, we summarize the current advances in our understanding of metabolic adaptations during viral infections, with a particular focus on the utilization of this information for therapeutic application.
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Affiliation(s)
- Katharina A Mayer
- Institute of Immunology, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Johannes Stöckl
- Institute of Immunology, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Gerhard J Zlabinger
- Institute of Immunology, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Guido A Gualdoni
- Division of Nephrology and Dialysis, Department of Medicine III, Medical University of Vienna, Vienna, Austria
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22
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Jiménez de Oya N, Esler WP, Huard K, El-Kattan AF, Karamanlidis G, Blázquez AB, Ramos-Ibeas P, Escribano-Romero E, Louloudes-Lázaro A, Casas J, Sobrino F, Hoehn K, James DE, Gutiérrez-Adán A, Saiz JC, Martín-Acebes MA. Targeting host metabolism by inhibition of acetyl-Coenzyme A carboxylase reduces flavivirus infection in mouse models. Emerg Microbes Infect 2019; 8:624-636. [PMID: 30999821 PMCID: PMC6493301 DOI: 10.1080/22221751.2019.1604084] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Flaviviruses are (re)-emerging RNA viruses strictly dependent on lipid metabolism for infection. In the search for host targeting antivirals, we explored the effect of pharmacological modulation of fatty acid metabolism during flavivirus infection. Considering the central role of acetyl-Coenzyme A carboxylase (ACC) on fatty acid metabolism, we analyzed the effect of three small-molecule ACC inhibitors (PF-05175157, PF-05206574, and PF-06256254) on the infection of medically relevant flaviviruses, namely West Nile virus (WNV), dengue virus, and Zika virus. Treatment with these compounds inhibited the multiplication of the three viruses in cultured cells. PF-05175157 induced a reduction of the viral load in serum and kidney in WNV-infected mice, unveiling its therapeutic potential for the treatment of chronic kidney disease associated with persistent WNV infection. This study constitutes a proof of concept of the reliability of ACC inhibitors to become viable antiviral candidates. These results support the repositioning of metabolic inhibitors as broad-spectrum antivirals.
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Affiliation(s)
- Nereida Jiménez de Oya
- a Department of Biotechnology , Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA) , Madrid , Spain
| | - William P Esler
- b Worldwide Research and Development Pfizer , Cambridge , MA , USA
| | - Kim Huard
- b Worldwide Research and Development Pfizer , Cambridge , MA , USA
| | | | - Georgios Karamanlidis
- b Worldwide Research and Development Pfizer , Cambridge , MA , USA.,h Present address: Cardiometabolic Disorders Amgen Discovery Research , Thousand Oaks , California 91320 , USA
| | - Ana-Belén Blázquez
- a Department of Biotechnology , Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA) , Madrid , Spain
| | | | - Estela Escribano-Romero
- a Department of Biotechnology , Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA) , Madrid , Spain
| | - Andrés Louloudes-Lázaro
- a Department of Biotechnology , Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA) , Madrid , Spain
| | - Josefina Casas
- d Department of Biomedicinal Chemistry , Institute for Advanced Chemistry of Catalonia (IQAC-CSIC) and CIBEREHD , Barcelona , Spain
| | - Francisco Sobrino
- e Department of Virology and Microbiology , Centro de Biología Molecular "Severo Ochoa" (CSIC-UAM) , Madrid , Spain
| | - Kyle Hoehn
- f School of Biotechnology and Biomolecular Sciences , University of New South Wales , Sydney , Australia
| | - David E James
- g Charles Perkins Centre, School of Life and Environmental Sciences, Sydney Medical School , University of Sydney , Australia
| | | | - Juan-Carlos Saiz
- a Department of Biotechnology , Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA) , Madrid , Spain
| | - Miguel A Martín-Acebes
- a Department of Biotechnology , Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA) , Madrid , Spain
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23
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Stearoyl-CoA desaturase-1 is required for flavivirus RNA replication. Antiviral Res 2019; 165:42-46. [PMID: 30853381 DOI: 10.1016/j.antiviral.2019.03.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 02/26/2019] [Accepted: 03/02/2019] [Indexed: 11/22/2022]
Abstract
Dengue virus (DENV) is the most prevalent human arthropod-borne virus and causes severe problems worldwide, mainly in tropical and sub-tropical regions. However, there is no specific antiviral drug against DENV infection. We and others recently reported that stearoyl-CoA desaturase-1 (SCD1) inhibitor showed potent suppression of hepatitis C virus replication. In this study, we examined the impact of SCD1 on DENV replication. We found that SCD1 inhibitors (MK8245 and #1716) dramatically suppressed DENV replication in a dose-dependent manner without cytotoxicity. This anti-DENV efficacy was observed against all four DENV serotypes and other flaviviruses, including Zika virus and Japanese encephalitis virus. A subgenomic replicon system of DENV was used to confirm that SCD1 inhibitor suppressed viral RNA replication. Interestingly, exogenous supplementation of unsaturated fatty acids resulted in recovery of the DENV titer even in the presence of SCD1 inhibitor, suggesting that fatty acid biosynthesis contributes to DENV genome replication. These findings indicate that SCD1 is a novel host factor required for DENV replication, and SCD1 inhibitor is a potential candidate for treating dengue fever.
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24
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Zhang Z, He G, Filipowicz NA, Randall G, Belov GA, Kopek BG, Wang X. Host Lipids in Positive-Strand RNA Virus Genome Replication. Front Microbiol 2019; 10:286. [PMID: 30863375 PMCID: PMC6399474 DOI: 10.3389/fmicb.2019.00286] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Accepted: 02/04/2019] [Indexed: 12/19/2022] Open
Abstract
Membrane association is a hallmark of the genome replication of positive-strand RNA viruses [(+)RNA viruses]. All well-studied (+)RNA viruses remodel host membranes and lipid metabolism through orchestrated virus-host interactions to create a suitable microenvironment to survive and thrive in host cells. Recent research has shown that host lipids, as major components of cellular membranes, play key roles in the replication of multiple (+)RNA viruses. This review focuses on how (+)RNA viruses manipulate host lipid synthesis and metabolism to facilitate their genomic RNA replication, and how interference with the cellular lipid metabolism affects viral replication.
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Affiliation(s)
- Zhenlu Zhang
- National Key Laboratory of Crop Biology, National Research Center for Apple Engineering and Technology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, China
- School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA, United States
| | - Guijuan He
- School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA, United States
- Fujian Province Key Laboratory of Plant Virology, Institute of Plant Virology, Fujian Agriculture and Forestry University, Fuzhou, China
| | | | - Glenn Randall
- Department of Microbiology, The University of Chicago, Chicago, IL, United States
| | - George A. Belov
- Virginia-Maryland Regional College of Veterinary Medicine, University of Maryland, College Park, MD, United States
| | | | - Xiaofeng Wang
- School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA, United States
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25
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Zhuang X, Magri A, Hill M, Lai AG, Kumar A, Rambhatla SB, Donald CL, Lopez-Clavijo AF, Rudge S, Pinnick K, Chang WH, Wing PAC, Brown R, Qin X, Simmonds P, Baumert TF, Ray D, Loudon A, Balfe P, Wakelam M, Butterworth S, Kohl A, Jopling CL, Zitzmann N, McKeating JA. The circadian clock components BMAL1 and REV-ERBα regulate flavivirus replication. Nat Commun 2019; 10:377. [PMID: 30670689 PMCID: PMC6343007 DOI: 10.1038/s41467-019-08299-7] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 12/17/2018] [Indexed: 12/27/2022] Open
Abstract
The circadian clock regulates immune responses to microbes and affects pathogen replication, but the underlying molecular mechanisms are not well understood. Here we demonstrate that the circadian components BMAL1 and REV-ERBα influence several steps in the hepatitis C virus (HCV) life cycle, including particle entry into hepatocytes and RNA genome replication. Genetic knock out of Bmal1 and over-expression or activation of REV-ERB with synthetic agonists inhibits the replication of HCV and the related flaviruses dengue and Zika via perturbation of lipid signaling pathways. This study highlights a role for the circadian clock component REV-ERBα in regulating flavivirus replication.
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Affiliation(s)
- Xiaodong Zhuang
- Nuffield Department of Medicine, University of Oxford, Oxford OX3 7FZ, UK
| | - Andrea Magri
- Nuffield Department of Medicine, University of Oxford, Oxford OX3 7FZ, UK
| | - Michelle Hill
- Oxford Glycobiology Institute, Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Alvina G Lai
- Nuffield Department of Medicine, University of Oxford, Oxford OX3 7FZ, UK
| | - Abhinav Kumar
- Oxford Glycobiology Institute, Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | | | - Claire L Donald
- MRC-University of Glasgow Centre for Virus Research, University of Glasgow, Glasgow G61 1QH, UK
| | | | - Simon Rudge
- The Babraham Institute, Cambridge CB22 3AT, UK
| | - Katherine Pinnick
- Oxford Centre for Diabetes Endocrinology Metabolism, University of Oxford, Oxford OX3 9DU, UK
| | - Wai Hoong Chang
- Nuffield Department of Medicine, University of Oxford, Oxford OX3 7FZ, UK
| | - Peter A C Wing
- Nuffield Department of Medicine, University of Oxford, Oxford OX3 7FZ, UK
| | - Ryan Brown
- Department of Chemistry, University of Birmingham, Birmingham B15 2TT, UK
| | - Ximing Qin
- Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
| | - Peter Simmonds
- Nuffield Department of Medicine, University of Oxford, Oxford OX3 7FZ, UK
| | - Thomas F Baumert
- Inserm U1110, Institut de Recherche sur les Maladies Virales et Hépatiques, Strasbourg 67000, France
| | - David Ray
- Faculty of Medical and Human Sciences, University of Manchester, Manchester M13 9PL, UK
| | - Andrew Loudon
- Faculty of Medical and Human Sciences, University of Manchester, Manchester M13 9PL, UK
| | - Peter Balfe
- Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham B15 2TT, UK
| | | | - Sam Butterworth
- Division of Pharmacy and Optometry, School of Health Sciences, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M13 9NT, UK
| | - Alain Kohl
- MRC-University of Glasgow Centre for Virus Research, University of Glasgow, Glasgow G61 1QH, UK
| | | | - Nicole Zitzmann
- Oxford Glycobiology Institute, Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Jane A McKeating
- Nuffield Department of Medicine, University of Oxford, Oxford OX3 7FZ, UK.
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González-Aldaco K, Torres-Reyes LA, Ojeda-Granados C, José-Ábrego A, Fierro NA, Román S. Immunometabolic Effect of Cholesterol in Hepatitis C Infection: Implications in Clinical Management and Antiviral Therapy. Ann Hepatol 2018; 17:908-919. [PMID: 30600305 DOI: 10.5604/01.3001.0012.7191] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Hepatitis C virus (HCV) is a lipid-enveloped virion particle that causes infection to the liver, and as part of its life cycle, it disrupts the host lipid metabolic machinery, particularly the cholesterol synthesis pathway. The innate immune response generated by liver resident immune cells is responsible for successful viral eradication. Unfortunately, most patients fail to eliminate HCV and progress to chronic infection. Chronic infection is associated with hepatic fat accumulation and inflammation that triggers fibrosis, cirrhosis, and eventually hepatocellular carcinoma. Despite that the current direct-acting antiviral agents have increased the cure rate of HCV infection, viral genotype and the host genetic background influence both the immune response and lipid metabolism. In this context, recent evidence has shown that cholesterol and its derivatives such as oxysterols might modulate and potentialize the hepatic innate immune response generated against HCV. The impairment of the HCV life cycle modulated by serum cholesterol could be relevant for the clinical management of HCV-infected patients before and after treatment. Alongside, cholesterol levels are modulated either by genetic variations in IL28B, ApoE, and LDLR or by dietary components. Indeed, some nutrients such as unsaturated fatty acids have demonstrated to be effective against HCV replication. Thus, cholesterol modifications may be considered as a new adjuvant strategy for HCV infection therapy by providing a biochemical tool that guides treatment decisions, an improved treatment response and favoring viral clearance. Herein, the mechanisms by which cholesterol contributes to the immune response against HCV infection and how genetic and environmental factors may affect this role are reviewed.
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Affiliation(s)
- Karina González-Aldaco
- Department of Molecular Biology in Medicine, Civil Hospital of Guadalajara, "Fray Antonio Alcalde" and Health Sciences Center, University of Guadalajara, Guadalajara, Jalisco, Mexico
| | - Luis A Torres-Reyes
- Department of Molecular Biology in Medicine, Civil Hospital of Guadalajara, "Fray Antonio Alcalde" and Health Sciences Center, University of Guadalajara, Guadalajara, Jalisco, Mexico
| | - Claudia Ojeda-Granados
- Department of Molecular Biology in Medicine, Civil Hospital of Guadalajara, "Fray Antonio Alcalde" and Health Sciences Center, University of Guadalajara, Guadalajara, Jalisco, Mexico
| | - Alexis José-Ábrego
- Department of Molecular Biology in Medicine, Civil Hospital of Guadalajara, "Fray Antonio Alcalde" and Health Sciences Center, University of Guadalajara, Guadalajara, Jalisco, Mexico
| | - Nora A Fierro
- Department of Molecular Biology in Medicine, Civil Hospital of Guadalajara, "Fray Antonio Alcalde" and Health Sciences Center, University of Guadalajara, Guadalajara, Jalisco, Mexico
| | - Sonia Román
- Department of Molecular Biology in Medicine, Civil Hospital of Guadalajara, "Fray Antonio Alcalde" and Health Sciences Center, University of Guadalajara, Guadalajara, Jalisco, Mexico
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Gullberg RC, Steel JJ, Pujari V, Rovnak J, Crick DC, Perera R. Stearoly-CoA desaturase 1 differentiates early and advanced dengue virus infections and determines virus particle infectivity. PLoS Pathog 2018; 14:e1007261. [PMID: 30118512 PMCID: PMC6114894 DOI: 10.1371/journal.ppat.1007261] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 08/29/2018] [Accepted: 08/06/2018] [Indexed: 02/04/2023] Open
Abstract
Positive strand RNA viruses, such as dengue virus type 2 (DENV2) expand and structurally alter ER membranes to optimize cellular communication pathways that promote viral replicative needs. These complex rearrangements require significant protein scaffolding as well as changes to the ER chemical composition to support these structures. We have previously shown that the lipid abundance and repertoire of host cells are significantly altered during infection with these viruses. Specifically, enzymes in the lipid biosynthesis pathway such as fatty acid synthase (FAS) are recruited to viral replication sites by interaction with viral proteins and displayed enhanced activities during infection. We have now identified that events downstream of FAS (fatty acid desaturation) are critical for virus replication. In this study we screened enzymes in the unsaturated fatty acid (UFA) biosynthetic pathway and found that the rate-limiting enzyme in monounsaturated fatty acid biosynthesis, stearoyl-CoA desaturase 1 (SCD1), is indispensable for DENV2 replication. The enzymatic activity of SCD1, was required for viral genome replication and particle release, and it was regulated in a time-dependent manner with a stringent requirement early during viral infection. As infection progressed, SCD1 protein expression levels were inversely correlated with the concentration of viral dsRNA in the cell. This modulation of SCD1, coinciding with the stage of viral replication, highlighted its function as a trigger of early infection and an enzyme that controlled alternate lipid requirements during early versus advanced infections. Loss of function of this enzyme disrupted structural alterations of assembled viral particles rendering them non-infectious and immature and defective in viral entry. This study identifies the complex involvement of SCD1 in DENV2 infection and demonstrates that these viruses alter ER lipid composition to increase infectivity of the virus particles.
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Affiliation(s)
- Rebekah C. Gullberg
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO, United States of America
| | - J. Jordan Steel
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO, United States of America
| | - Venugopal Pujari
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO, United States of America
| | - Joel Rovnak
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO, United States of America
| | - Dean C. Crick
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO, United States of America
| | - Rushika Perera
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO, United States of America
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Hofmann S, Krajewski M, Scherer C, Scholz V, Mordhorst V, Truschow P, Schöbel A, Reimer R, Schwudke D, Herker E. Complex lipid metabolic remodeling is required for efficient hepatitis C virus replication. Biochim Biophys Acta Mol Cell Biol Lipids 2018; 1863:1041-1056. [PMID: 29885363 DOI: 10.1016/j.bbalip.2018.06.002] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 03/16/2018] [Accepted: 06/01/2018] [Indexed: 12/12/2022]
Abstract
The hepatitis C virus (HCV) life cycle is tightly linked to the host cell lipid metabolism with the endoplasmic reticulum-derived membranous web harboring viral RNA replication complexes and lipid droplets as virion assembly sites. To investigate HCV-induced changes in the lipid composition, we performed quantitative shotgun lipidomic studies of whole cell extracts and subcellular compartments. Our results indicate that HCV infection reduces the ratio of neutral to membrane lipids. While the amount of neutral lipids and lipid droplet morphology were unchanged, membrane lipids, especially cholesterol and phospholipids, accumulated in the microsomal fraction in HCV-infected cells. In addition, HCV-infected cells had a higher relative abundance of phosphatidylcholines and triglycerides with longer fatty acyl chains and a strikingly increased utilization of C18 fatty acids, most prominently oleic acid (FA [18:1]). Accordingly, depletion of fatty acid elongases and desaturases impaired HCV replication. Moreover, the analysis of free fatty acids revealed increased levels of polyunsaturated fatty acids (PUFAs) caused by HCV infection. Interestingly, inhibition of the PUFA synthesis pathway via knockdown of the rate-limiting Δ6-desaturase enzyme or by treatment with a high dose of a small-molecule inhibitor impaired viral progeny production, indicating that elevated PUFAs are needed for virion morphogenesis. In contrast, pretreatment with low inhibitor concentrations promoted HCV translation and/or early RNA replication. Taken together our results demonstrate the complex remodeling of the host cell lipid metabolism induced by HCV to enhance both virus replication and progeny production.
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Affiliation(s)
- Sarah Hofmann
- Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Martinistrasse 52, 20251 Hamburg, Germany
| | - Matthias Krajewski
- Division of Bioanalytical Chemistry, Research Center Borstel - Leibniz Lung Center, Parkallee 10, 23845 Borstel, Germany
| | - Christina Scherer
- Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Martinistrasse 52, 20251 Hamburg, Germany
| | - Verena Scholz
- Division of Bioanalytical Chemistry, Research Center Borstel - Leibniz Lung Center, Parkallee 10, 23845 Borstel, Germany
| | - Valerie Mordhorst
- Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Martinistrasse 52, 20251 Hamburg, Germany
| | - Pavel Truschow
- Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Martinistrasse 52, 20251 Hamburg, Germany
| | - Anja Schöbel
- Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Martinistrasse 52, 20251 Hamburg, Germany
| | - Rudolph Reimer
- Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Martinistrasse 52, 20251 Hamburg, Germany
| | - Dominik Schwudke
- Division of Bioanalytical Chemistry, Research Center Borstel - Leibniz Lung Center, Parkallee 10, 23845 Borstel, Germany
| | - Eva Herker
- Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Martinistrasse 52, 20251 Hamburg, Germany.
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MicroRNAs-Dependent Regulation of PPARs in Metabolic Diseases and Cancers. PPAR Res 2017; 2017:7058424. [PMID: 28167956 PMCID: PMC5266863 DOI: 10.1155/2017/7058424] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 12/05/2016] [Indexed: 12/23/2022] Open
Abstract
Peroxisome proliferator-activated receptors (PPARs) are a family of ligand-dependent nuclear receptors, which control the transcription of genes involved in energy homeostasis and inflammation and cell proliferation/differentiation. Alterations of PPARs' expression and/or activity are commonly associated with metabolic disorders occurring with obesity, type 2 diabetes, and fatty liver disease, as well as with inflammation and cancer. Emerging evidence now indicates that microRNAs (miRNAs), a family of small noncoding RNAs, which fine-tune gene expression, play a significant role in the pathophysiological mechanisms regulating the expression and activity of PPARs. Herein, the regulation of PPARs by miRNAs is reviewed in the context of metabolic disorders, inflammation, and cancer. The reciprocal control of miRNAs expression by PPARs, as well as the therapeutic potential of modulating PPAR expression/activity by pharmacological compounds targeting miRNA, is also discussed.
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30
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Stearoyl-CoA desaturase-1 and adaptive stress signaling. Biochim Biophys Acta Mol Cell Biol Lipids 2016; 1861:1719-1726. [DOI: 10.1016/j.bbalip.2016.08.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 08/09/2016] [Accepted: 08/17/2016] [Indexed: 12/31/2022]
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Fungus-Derived Neoechinulin B as a Novel Antagonist of Liver X Receptor, Identified by Chemical Genetics Using a Hepatitis C Virus Cell Culture System. J Virol 2016; 90:9058-74. [PMID: 27489280 DOI: 10.1128/jvi.00856-16] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 07/20/2016] [Indexed: 12/13/2022] Open
Abstract
UNLABELLED Cell culture systems reproducing virus replication can serve as unique models for the discovery of novel bioactive molecules. Here, using a hepatitis C virus (HCV) cell culture system, we identified neoechinulin B (NeoB), a fungus-derived compound, as an inhibitor of the liver X receptor (LXR). NeoB was initially identified by chemical screening as a compound that impeded the production of infectious HCV. Genome-wide transcriptome analysis and reporter assays revealed that NeoB specifically inhibits LXR-mediated transcription. NeoB was also shown to interact directly with LXRs. Analysis of structural analogs suggested that the molecular interaction of NeoB with LXR correlated with the capacity to inactivate LXR-mediated transcription and to modulate lipid metabolism in hepatocytes. Our data strongly suggested that NeoB is a novel LXR antagonist. Analysis using NeoB as a bioprobe revealed that LXRs support HCV replication: LXR inactivation resulted in dispersion of double-membrane vesicles, putative viral replication sites. Indeed, cells treated with NeoB showed decreased replicative permissiveness for poliovirus, which also replicates in double-membrane vesicles, but not for dengue virus, which replicates via a distinct membrane compartment. Together, our data suggest that LXR-mediated transcription regulates the formation of virus-associated membrane compartments. Significantly, inhibition of LXRs by NeoB enhanced the activity of all known classes of anti-HCV agents, and NeoB showed especially strong synergy when combined with interferon or an HCV NS5A inhibitor. Thus, our chemical genetics analysis demonstrates the utility of the HCV cell culture system for identifying novel bioactive molecules and characterizing the virus-host interaction machinery. IMPORTANCE Hepatitis C virus (HCV) is highly dependent on host factors for efficient replication. In the present study, we used an HCV cell culture system to screen an uncharacterized chemical library. Our results identified neoechinulin B (NeoB) as a novel inhibitor of the liver X receptor (LXR). NeoB inhibited the induction of LXR-regulated genes and altered lipid metabolism. Intriguingly, our results indicated that LXRs are critical to the process of HCV replication: LXR inactivation by NeoB disrupted double-membrane vesicles, putative sites of viral replication. Moreover, NeoB augmented the antiviral activity of all known classes of currently approved anti-HCV agents without increasing cytotoxicity. Thus, our strategy directly links the identification of novel bioactive compounds to basic virology and the development of new antiviral agents.
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32
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Nio Y, Hasegawa H, Okamura H, Miyayama Y, Akahori Y, Hijikata M. Liver-specific mono-unsaturated fatty acid synthase-1 inhibitor for anti-hepatitis C treatment. Antiviral Res 2016; 132:262-7. [PMID: 27392483 DOI: 10.1016/j.antiviral.2016.07.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 07/01/2016] [Indexed: 11/19/2022]
Abstract
Recently, direct antiviral agents against hepatitis C virus (HCV) infection have been developed as highly effective anti-HCV drugs. However, the appearance of resistant viruses against direct anti-viral agents is an unsolved problem. One of the strategies considered to suppress the emergence of the drug-resistant viruses is to use drugs inhibiting the host factor, which contributes to HCV proliferation, in combination with direct anti-viral agents. The replication complex was reported to be present in the membranous compartment in the cells. Thus, lipid metabolism modulators are good candidates to regulate virus assembly and HCV replication. Recent studies have shown that stearoyl-CoA desaturase (SCD), an enzyme for long-chain mono-unsaturated fatty acid (LCMUFA) synthesis, is a key factor that defines HCV replication efficiency. Systemic exposure to SCD-1 inhibor induces some side effects in the eyes and skin. Thus, systemic SCD-1 inhibitors are considered inappropriate for HCV therapy. To avoid the side effects of systemic SCD-1 inhibitors, the liver-specific SCD-1 inhibitor, MK8245, was synthesized; it showed antidiabetic effects in diabetic model mice with no side effects. In the phase 1 clinical study on measurement of MK8245 tolerability, no significant side effects were reported (ClinicalTrials.gov Identifier: NCT00790556). Therefore, we thought liver-specific SCD-1 inhibitors would be suitable agents for HCV-infected patients. MK8245 was evaluated using recombinant HCV culture systems. Considering current HCV treatments, to avoid the emergence of direct anti-viral agents-resistant viruses, combination therapy with direct anti-viral agents and host-targeted agents would be optimal. With this viewpoint, we confirmed MK8245's additive or synergistic anti-HCV effects on current direct anti-viral agents and interferon-alpha therapy. The results suggest that MK8245 is an option for anti-HCV multi-drug therapy with a low risk of emergence of drug-resistant HCV without significant side effects.
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Affiliation(s)
- Yasunori Nio
- Takeda Pharmaceutical Company Limited, Pharmaceutical Research Division, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan.
| | - Hikari Hasegawa
- Laboratory of Human Tumor Viruses, The Institute for Virus Research, Kyoto University, 53 Kawaharacho, Shogoin, Sakyoku, Kyoto 606-8507, Japan; Grad. Sch. of Biostudies, Kyoto University, 53 Kawaharacho, Shogoin, Sakyoku, Kyoto 606-8507, Japan
| | - Hitomi Okamura
- Laboratory of Human Tumor Viruses, The Institute for Virus Research, Kyoto University, 53 Kawaharacho, Shogoin, Sakyoku, Kyoto 606-8507, Japan; Grad. Sch. of Biostudies, Kyoto University, 53 Kawaharacho, Shogoin, Sakyoku, Kyoto 606-8507, Japan
| | - Yohei Miyayama
- Laboratory of Human Tumor Viruses, The Institute for Virus Research, Kyoto University, 53 Kawaharacho, Shogoin, Sakyoku, Kyoto 606-8507, Japan; Grad. Sch. of Biostudies, Kyoto University, 53 Kawaharacho, Shogoin, Sakyoku, Kyoto 606-8507, Japan
| | - Yuichi Akahori
- Laboratory of Human Tumor Viruses, The Institute for Virus Research, Kyoto University, 53 Kawaharacho, Shogoin, Sakyoku, Kyoto 606-8507, Japan; Grad. Sch. of Biostudies, Kyoto University, 53 Kawaharacho, Shogoin, Sakyoku, Kyoto 606-8507, Japan
| | - Makoto Hijikata
- Laboratory of Human Tumor Viruses, The Institute for Virus Research, Kyoto University, 53 Kawaharacho, Shogoin, Sakyoku, Kyoto 606-8507, Japan; Grad. Sch. of Biostudies, Kyoto University, 53 Kawaharacho, Shogoin, Sakyoku, Kyoto 606-8507, Japan.
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33
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Uto Y. Recent progress in the discovery and development of stearoyl CoA desaturase inhibitors. Chem Phys Lipids 2016; 197:3-12. [DOI: 10.1016/j.chemphyslip.2015.08.018] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Revised: 08/27/2015] [Accepted: 08/31/2015] [Indexed: 01/07/2023]
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34
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Helms JB, Kaloyanova DV, Strating JRP, van Hellemond JJ, van der Schaar HM, Tielens AGM, van Kuppeveld FJM, Brouwers JF. Targeting of the hydrophobic metabolome by pathogens. Traffic 2016; 16:439-60. [PMID: 25754025 PMCID: PMC7169838 DOI: 10.1111/tra.12280] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 01/09/2015] [Accepted: 01/09/2015] [Indexed: 12/12/2022]
Abstract
The hydrophobic molecules of the metabolome – also named the lipidome – constitute a major part of the entire metabolome. Novel technologies show the existence of a staggering number of individual lipid species, the biological functions of which are, with the exception of only a few lipid species, unknown. Much can be learned from pathogens that have evolved to take advantage of the complexity of the lipidome to escape the immune system of the host organism and to allow their survival and replication. Different types of pathogens target different lipids as shown in interaction maps, allowing visualization of differences between different types of pathogens. Bacterial and viral pathogens target predominantly structural and signaling lipids to alter the cellular phenotype of the host cell. Fungal and parasitic pathogens have complex lipidomes themselves and target predominantly the release of polyunsaturated fatty acids from the host cell lipidome, resulting in the generation of eicosanoids by either the host cell or the pathogen. Thus, whereas viruses and bacteria induce predominantly alterations in lipid metabolites at the host cell level, eukaryotic pathogens focus on interference with lipid metabolites affecting systemic inflammatory reactions that are part of the immune system. A better understanding of the interplay between host–pathogen interactions will not only help elucidate the fundamental role of lipid species in cellular physiology, but will also aid in the generation of novel therapeutic drugs.
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Affiliation(s)
- J Bernd Helms
- Department of Biochemistry and Cell Biology, Faculty of Veterinary Medicine & Institute of Biomembranes, Utrecht University, Yalelaan 2, 3584 CM, Utrecht, The Netherlands
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Shi Q, Hoffman B, Liu Q. PI3K-Akt signaling pathway upregulates hepatitis C virus RNA translation through the activation of SREBPs. Virology 2016; 490:99-108. [PMID: 26855332 DOI: 10.1016/j.virol.2016.01.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 01/21/2016] [Indexed: 02/06/2023]
Abstract
Hepatitis C virus (HCV) activates PI3K-Akt signaling to enhance entry and replication. Here, we found that this pathway also increased HCV translation. Knocking down the three Akt isoforms significantly decreased, whereas ectopic expression increased HCV translation. HCV translation upregulation by Akt required their kinase activities because Akt kinase-dead mutants downregulated HCV translation; and was dependent on PI3K activity since it was sensitive to PI3K inhibitor wortmannin. The viral 3'UTR was not involved in translation upregulation by Akt. HCV NS5A increased Akt phosphorylation/activity and HCV translation in the absence of the viral 3'UTR. Sterol regulatory element-binding proteins (SREBPs) were the downstream effectors of the PI3K-Akt pathway in regulating HCV translation because Akt1 and Akt2 activated both SREBP-1 and SREBP-2, whereas Akt3 upregulated SREBP-1. Knocking down SREBPs significantly decreased, while ectopic expression of SREBPs increased HCV translation. Taken together, we showed that the PI3K-Akt signaling pathway positively regulates HCV translation through SREBPs.
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Affiliation(s)
| | - Brett Hoffman
- VIDO-InterVac, Vaccinology and Immunotherapeutics, Canada
| | - Qiang Liu
- VIDO-InterVac, Vaccinology and Immunotherapeutics, Veterinary Microbiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
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36
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Zhou LY, Zhang LL. Host restriction factors for hepatitis C virus. World J Gastroenterol 2016; 22:1477-86. [PMID: 26819515 PMCID: PMC4721981 DOI: 10.3748/wjg.v22.i4.1477] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 09/30/2015] [Accepted: 11/13/2015] [Indexed: 02/06/2023] Open
Abstract
Host-hepatitis C virus (HCV) interactions have both informed fundamental concepts of viral replication and pathogenesis and provided novel insights into host cell biology. These findings are illustrated by the recent discovery of host-encoded factors that restrict HCV infection. In this review, we briefly discuss these restriction factors in different steps of HCV infection. In each case, we discuss how these restriction factors were identified, the mechanisms by which they inhibit HCV infection and their potential contribution to viral pathogenesis.
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37
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Singaravelu R, O'Hara S, Jones DM, Chen R, Taylor NG, Srinivasan P, Quan C, Roy DG, Steenbergen RH, Kumar A, Lyn RK, Özcelik D, Rouleau Y, Nguyen MA, Rayner KJ, Hobman TC, Tyrrell DL, Russell RS, Pezacki JP. MicroRNAs regulate the immunometabolic response to viral infection in the liver. Nat Chem Biol 2015; 11:988-93. [DOI: 10.1038/nchembio.1940] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 09/11/2015] [Indexed: 12/12/2022]
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38
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Wang H, Zhang Y, Lu Y, Song J, Huang M, Zhang J, Huang Y. The role of stearoyl-coenzyme A desaturase 1 in clear cell renal cell carcinoma. Tumour Biol 2015. [PMID: 26224474 DOI: 10.1007/s13277-015-3451-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
This study aimed to investigate the correlations of stearoyl-coenzyme A desaturase 1 (SCD-1) with clear cell renal cell carcinoma (ccRCC) severity and PI3K-AKT-mTOR signaling pathway. From 2004 to 2006, tumor tissue and normal pericarcinomatous tissue from ccRCC samples were collected from ccRCC patients at Renji Hospital of Shanghai Jiaotong University. The expression of SCD-1 in the collected ccRCC samples and four cell lines (A498, 769-P, 786-O, and CAKI) was detected by Western blot. The correlation between SCD-1 expression and ccRCC severity was also analyzed by immunohistochemistry. Stable 786-O and 769-P ccRCC cells expressing SCD-1 short hairpin RNA (shRNA) were constructed, and the expression of proteins in the PI3K-AKT-mTOR signaling pathway was also detected. Finally, the inhibitory effect of PI3K-AKT-mTOR inhibitors (PI103, MK2206, rapamycin, AZD8055, and RAD001) on ccRCC cells stably expressing SCD-1 shRNA was also measured. Higher SCD-1 expression level was observed in ccRCC tissues compared with normal tissues. SCD-1 expression level was the highest in 786-O. SCD-1 expression was positively correlated with the tumor-node-metastasis (TNM) stage, grade of tumor cells, and lymphatic metastasis. There were no changes in the expression of AKT, ERK, PI3K, and PDK1. Significant differences were observed in the expression of p-AKT (at the Ser473 and Thr308 site), p-ERK, and two mTOR downstream molecules (4E-BP1 and p-P70S6K1) in cells stably expressing SCD-1 shRNA. PI103 and AZD8055 could enhance the inhibitory effect of SCD-1 interference on proliferation and migration of 786-O and 769-P cells. AZD8055 is recommended for the combined ccRCC treatment with shRNA interference.
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Affiliation(s)
- Hui Wang
- Department of Urology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, No. 1630 Dongfang Road, Shanghai, 200127, China
| | - Yujian Zhang
- Department of Urology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, No. 1630 Dongfang Road, Shanghai, 200127, China
| | - Yongning Lu
- Department of Urology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, No. 1630 Dongfang Road, Shanghai, 200127, China
| | - Jiajia Song
- Department of Urology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, No. 1630 Dongfang Road, Shanghai, 200127, China
| | - Min Huang
- Division of Antitumor Pharmacology, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Jin Zhang
- Department of Urology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, No. 1630 Dongfang Road, Shanghai, 200127, China.
| | - Yiran Huang
- Department of Urology, Renji Hospital, School of Medicine, Shanghai Jiaotong University, No. 1630 Dongfang Road, Shanghai, 200127, China.
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Antonny B, Vanni S, Shindou H, Ferreira T. From zero to six double bonds: phospholipid unsaturation and organelle function. Trends Cell Biol 2015; 25:427-36. [DOI: 10.1016/j.tcb.2015.03.004] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 03/19/2015] [Accepted: 03/23/2015] [Indexed: 01/21/2023]
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Singaravelu R, Srinivasan P, Pezacki JP. Armand-Frappier Outstanding Student Award--The emerging role of 25-hydroxycholesterol in innate immunity. Can J Microbiol 2015; 61:521-30. [PMID: 26182401 DOI: 10.1139/cjm-2015-0292] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The metabolic interplay between hosts and viruses plays a crucial role in determining the outcome of viral infection. Viruses reorchestrate the host's primary metabolic gene networks, including genes associated with mevalonate and isoprenoid synthesis, to acquire the necessary energy and structural components for their viral life cycles. Recent work has demonstrated that the interferon-mediated antiviral response suppresses the sterol pathway through production of a signalling molecule, 25-hydroxycholesterol (25HC). This oxysterol has been shown to exert multiple effects, both through incorporation into host cellular membranes as well as through transcriptional control. Herein, we summarize our current understanding of the multifunctional roles of 25HC in the mammalian innate antiviral response.
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Affiliation(s)
- Ragunath Singaravelu
- a Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON K1N 6N5, Canada.,b Life Sciences Division, National Research Council Canada, Ottawa, ON K1A 0R6, Canada
| | - Prashanth Srinivasan
- a Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON K1N 6N5, Canada.,b Life Sciences Division, National Research Council Canada, Ottawa, ON K1A 0R6, Canada
| | - John Paul Pezacki
- a Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON K1N 6N5, Canada.,b Life Sciences Division, National Research Council Canada, Ottawa, ON K1A 0R6, Canada.,c Department of Chemistry, University of Ottawa, Ottawa, ON K1N 6N5, Canada
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Phosphatidylinositol-(4,5)-Bisphosphate Acyl Chains Differentiate Membrane Binding of HIV-1 Gag from That of the Phospholipase Cδ1 Pleckstrin Homology Domain. J Virol 2015; 89:7861-73. [PMID: 25995263 DOI: 10.1128/jvi.00794-15] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 05/13/2015] [Indexed: 12/19/2022] Open
Abstract
UNLABELLED HIV-1 Gag, which drives virion assembly, interacts with a plasma membrane (PM)-specific phosphoinositide, phosphatidylinositol-(4,5)-bisphosphate [PI(4,5)P2]. While cellular acidic phospholipid-binding proteins/domains, such as the PI(4,5)P2-specific pleckstrin homology domain of phospholipase Cδ1 (PHPLCδ1), mediate headgroup-specific interactions with corresponding phospholipids, the exact nature of the Gag-PI(4,5)P2 interaction remains undetermined. In this study, we used giant unilamellar vesicles (GUVs) to examine how PI(4,5)P2 with unsaturated or saturated acyl chains affect membrane binding of PHPLCδ1 and Gag. Both unsaturated dioleoyl-PI(4,5)P2 [DO-PI(4,5)P2] and saturated dipalmitoyl-PI(4,5)P2 [DP-PI(4,5)P2] successfully recruited PHPLCδ1 to membranes of single-phase GUVs. In contrast, DO-PI(4,5)P2 but not DP-PI(4,5)P2 recruited Gag to GUVs, indicating that PI(4,5)P2 acyl chains contribute to stable membrane binding of Gag. GUVs containing PI(4,5)P2, cholesterol, and dipalmitoyl phosphatidylserine separated into two coexisting phases: one was a liquid phase, and the other appeared to be a phosphatidylserine-enriched gel phase. In these vesicles, the liquid phase recruited PHPLCδ1 regardless of PI(4,5)P2 acyl chains. Likewise, Gag bound to the liquid phase when PI(4,5)P2 had DO-acyl chains. DP-PI(4,5)P2-containing GUVs showed no detectable Gag binding to the liquid phase. Unexpectedly, however, DP-PI(4,5)P2 still promoted recruitment of Gag, but not PHPLCδ1, to the dipalmitoyl-phosphatidylserine-enriched gel phase of these GUVs. Altogether, these results revealed different roles for PI(4,5)P2 acyl chains in membrane binding of two PI(4,5)P2-binding proteins, Gag and PHPLCδ1. Notably, we observed that nonmyristylated Gag retains the preference for PI(4,5)P2 containing an unsaturated acyl chain over DP-PI(4,5)P2, suggesting that Gag sensitivity to PI(4,5)P2 acyl chain saturation is determined directly by the matrix-PI(4,5)P2 interaction, rather than indirectly by a myristate-dependent mechanism. IMPORTANCE Binding of HIV-1 Gag to the plasma membrane is promoted by its interaction with a plasma membrane-localized phospholipid, PI(4,5)P2. Many cellular proteins are also recruited to the plasma membrane via PI(4,5)P2-interacting domains represented by PHPLCδ1. However, differences and/or similarities between these host proteins and viral Gag protein in the nature of their PI(4,5)P2 interactions, especially in the context of membrane binding, remain to be determined. Using a novel giant unilamellar vesicle-based system, we found that PI(4,5)P2 with an unsaturated acyl chain recruited PHPLCδ1 and Gag similarly, whereas PI(4,5)P2 with saturated acyl chains either recruited PHPLCδ1 but not Gag or sorted these proteins to different phases of vesicles. To our knowledge, this is the first study to show that PI(4,5)P2 acyl chains differentially modulate membrane binding of PI(4,5)P2-binding proteins. Since Gag membrane binding is essential for progeny virion production, the PI(4,5)P2 acyl chain property may serve as a potential target for anti-HIV therapeutic strategies.
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Aimo L, Liechti R, Hyka-Nouspikel N, Niknejad A, Gleizes A, Götz L, Kuznetsov D, David FPA, van der Goot FG, Riezman H, Bougueleret L, Xenarios I, Bridge A. The SwissLipids knowledgebase for lipid biology. Bioinformatics 2015; 31:2860-6. [PMID: 25943471 PMCID: PMC4547616 DOI: 10.1093/bioinformatics/btv285] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 04/29/2015] [Indexed: 12/20/2022] Open
Abstract
MOTIVATION Lipids are a large and diverse group of biological molecules with roles in membrane formation, energy storage and signaling. Cellular lipidomes may contain tens of thousands of structures, a staggering degree of complexity whose significance is not yet fully understood. High-throughput mass spectrometry-based platforms provide a means to study this complexity, but the interpretation of lipidomic data and its integration with prior knowledge of lipid biology suffers from a lack of appropriate tools to manage the data and extract knowledge from it. RESULTS To facilitate the description and exploration of lipidomic data and its integration with prior biological knowledge, we have developed a knowledge resource for lipids and their biology-SwissLipids. SwissLipids provides curated knowledge of lipid structures and metabolism which is used to generate an in silico library of feasible lipid structures. These are arranged in a hierarchical classification that links mass spectrometry analytical outputs to all possible lipid structures, metabolic reactions and enzymes. SwissLipids provides a reference namespace for lipidomic data publication, data exploration and hypothesis generation. The current version of SwissLipids includes over 244 000 known and theoretically possible lipid structures, over 800 proteins, and curated links to published knowledge from over 620 peer-reviewed publications. We are continually updating the SwissLipids hierarchy with new lipid categories and new expert curated knowledge. AVAILABILITY SwissLipids is freely available at http://www.swisslipids.org/. CONTACT alan.bridge@isb-sib.ch SUPPLEMENTARY INFORMATION Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- Lucila Aimo
- Swiss-Prot Group, SIB Swiss Institute of Bioinformatics, CMU, 1 rue Michel-Servet, CH-1211 Geneva 4, Switzerland
| | - Robin Liechti
- Vital-IT, SIB Swiss Institute of Bioinformatics, Quartier Sorge, Bâtiment Génopode, CH-1015 Lausanne, Switzerland
| | - Nevila Hyka-Nouspikel
- Swiss-Prot Group, SIB Swiss Institute of Bioinformatics, CMU, 1 rue Michel-Servet, CH-1211 Geneva 4, Switzerland
| | - Anne Niknejad
- Swiss-Prot Group, SIB Swiss Institute of Bioinformatics, CMU, 1 rue Michel-Servet, CH-1211 Geneva 4, Switzerland
| | - Anne Gleizes
- Swiss-Prot Group, SIB Swiss Institute of Bioinformatics, CMU, 1 rue Michel-Servet, CH-1211 Geneva 4, Switzerland
| | - Lou Götz
- Vital-IT, SIB Swiss Institute of Bioinformatics, Quartier Sorge, Bâtiment Génopode, CH-1015 Lausanne, Switzerland
| | - Dmitry Kuznetsov
- Vital-IT, SIB Swiss Institute of Bioinformatics, Quartier Sorge, Bâtiment Génopode, CH-1015 Lausanne, Switzerland
| | - Fabrice P A David
- Bioinformatics and Biostatistics Core Facility, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland, SIB Swiss Institute of Bioinformatics, CH-1015 Lausanne, Switzerland
| | - F Gisou van der Goot
- Global Health Institute, École Polytechnique Fédérale de Lausanne, Station 19, CH-1015 Lausanne, Switzerland
| | - Howard Riezman
- Department of Biochemistry, University of Geneva, CH-1211 Geneva, Switzerland, Switzerland National Centre of Competence in Research "Chemical Biology", University of Geneva, CH-1211 Geneva, Switzerland and
| | - Lydie Bougueleret
- Swiss-Prot Group, SIB Swiss Institute of Bioinformatics, CMU, 1 rue Michel-Servet, CH-1211 Geneva 4, Switzerland
| | - Ioannis Xenarios
- Swiss-Prot Group, SIB Swiss Institute of Bioinformatics, CMU, 1 rue Michel-Servet, CH-1211 Geneva 4, Switzerland, Vital-IT, SIB Swiss Institute of Bioinformatics, Quartier Sorge, Bâtiment Génopode, CH-1015 Lausanne, Switzerland, Department of Biochemistry, University of Geneva, CH-1211 Geneva, Switzerland, Centre for Integrative Genomics, University of Lausanne, CH-1015 Lausanne, Switzerland
| | - Alan Bridge
- Swiss-Prot Group, SIB Swiss Institute of Bioinformatics, CMU, 1 rue Michel-Servet, CH-1211 Geneva 4, Switzerland
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Singaravelu R, Desrochers GF, Srinivasan P, O’Hara S, Lyn RK, Müller R, Jones DM, Russell RS, Pezacki JP. Soraphen A: A Probe for Investigating the Role of de Novo Lipogenesis during Viral Infection. ACS Infect Dis 2015; 1:130-4. [PMID: 27622463 DOI: 10.1021/acsinfecdis.5b00019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Many viruses including the hepatitis C virus (HCV) induce changes to the infected host cell metabolism that include the up-regulation of lipogenesis to create a favorable environment for the virus to propagate. The enzyme acetyl-CoA carboxylase (ACC) polymerizes to form a supramolecular complex that catalyzes the rate-limiting step of de novo lipogenesis. The small molecule natural product Soraphen A (SorA) acts as a nanomolar inhibitor of acetyl-CoA carboxylase activity through disruption of the formation of long highly active ACC polymers from less active ACC dimers. We have shown that SorA inhibits HCV replication in HCV cell culture models expressing subgenomic and full-length replicons (IC50 = 5 nM) as well as a cell culture adapted virus. Using coherent anti-Stokes Raman scattering (CARS) microscopy, we have shown that SorA lowers the total cellular lipid volume in hepatoma cells, consistent with a reduction in de novo lipogenesis. Furthermore, SorA treatment was found to depolymerize the ACC complexes into less active dimers. Taken together, our results suggest that SorA treatment reverses HCV-induced lipid accumulation and demonstrate that SorA is a valuable probe to study the roles of ACC polymerization and enzymatic activity in viral pathogenesis.
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Affiliation(s)
- Ragunath Singaravelu
- Life
Sciences Division, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Geneviève F. Desrochers
- Life
Sciences Division, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Prashanth Srinivasan
- Life
Sciences Division, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Shifawn O’Hara
- Life
Sciences Division, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Rodney K. Lyn
- Life
Sciences Division, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Rolf Müller
- Institute
of Pharmaceutical Biotechnology, Saarland University, P.O. Box 151150, D-66041 Saarbrücken, Germany
| | - Daniel M. Jones
- Immunology
and Infectious Diseases, Faculty of Medicine, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada A1B 3V6
| | - Rodney S. Russell
- Immunology
and Infectious Diseases, Faculty of Medicine, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada A1B 3V6
| | - John Paul Pezacki
- Life
Sciences Division, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
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Hepatitis C virus life cycle and lipid metabolism. BIOLOGY 2014; 3:892-921. [PMID: 25517881 PMCID: PMC4280516 DOI: 10.3390/biology3040892] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 12/04/2014] [Accepted: 12/08/2014] [Indexed: 12/12/2022]
Abstract
Hepatitis C Virus (HCV) infects over 150 million people worldwide. In most cases HCV infection becomes chronic, causing liver disease ranging from fibrosis to cirrhosis and hepatocellular carcinoma. HCV affects the cholesterol homeostasis and at the molecular level, every step of the virus life cycle is intimately connected to lipid metabolism. In this review, we present an update on the lipids and apolipoproteins that are involved in the HCV infectious cycle steps: entry, replication and assembly. Moreover, the result of the assembly process is a lipoviroparticle, which represents a peculiarity of hepatitis C virion. This review illustrates an example of an intricate virus-host interaction governed by lipid metabolism.
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Stearoyl coenzyme A desaturase 1 is associated with hepatitis C virus replication complex and regulates viral replication. J Virol 2014; 88:12311-25. [PMID: 25122791 DOI: 10.1128/jvi.01678-14] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
UNLABELLED The hepatitis C virus (HCV) life cycle is tightly regulated by lipid metabolism of host cells. In order to identify host factors involved in HCV propagation, we have recently screened a small interfering RNA (siRNA) library targeting host genes that control lipid metabolism and lipid droplet formation using cell culture-grown HCV (HCVcc)-infected cells. We selected and characterized the gene encoding stearoyl coenzyme A (CoA) desaturase 1 (SCD1). siRNA-mediated knockdown or pharmacological inhibition of SCD1 abrogated HCV replication in both subgenomic replicon and Jc1-infected cells, while exogenous supplementation of either oleate or palmitoleate, products of SCD1 activity, resurrected HCV replication in SCD1 knockdown cells. SCD1 was coimmunoprecipitated with HCV nonstructural proteins and colocalized with both double-stranded RNA (dsRNA) and HCV nonstructural proteins, indicating that SCD1 is associated with HCV replication complex. Moreover, SCD1 was fractionated and enriched with HCV nonstructural proteins at detergent-resistant membrane. Electron microscopy data showed that SCD1 is required for NS4B-mediated intracellular membrane rearrangement. These data further support the idea that SCD1 is associated with HCV replication complex and that its products may contribute to the proper formation and maintenance of membranous web structures in HCV replication complex. Collectively, these data suggest that manipulation of SCD1 activity may represent a novel host-targeted antiviral strategy for the treatment of HCV infection. IMPORTANCE Stearoyl coenzyme A (CoA) desaturase 1 (SCD1), a liver-specific enzyme, regulates hepatitis C virus (HCV) replication through its enzyme activity. HCV nonstructural proteins are associated with SCD1 at detergent-resistant membranes, and SCD1 is enriched on the lipid raft by HCV infection. Therein, SCD1 supports NS4B-mediated membrane rearrangement to provide a suitable microenvironment for HCV replication. We demonstrated that either genetic or chemical knockdown of SCD1 abrogated HCV replication in both replicon cells and HCV-infected cells. These findings provide novel mechanistic insights into the roles of SCD1 in HCV replication.
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Singaravelu R, Delcorde J, Lyn RK, Steenbergen RH, Jones DM, Tyrrell DL, Russell RS, Pezacki JP. Investigating the antiviral role of cell death-inducing DFF45-like effector B in HCV replication. FEBS J 2014; 281:3751-65. [PMID: 24980280 DOI: 10.1111/febs.12901] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2014] [Revised: 06/25/2014] [Accepted: 06/27/2014] [Indexed: 12/16/2022]
Abstract
Cell-death-inducing DFF45-like effector B (CIDEB) is an apoptotic host factor, which was recently found to also regulate hepatic lipid homeostasis. Herein we delineate the relevance of these dual roles of CIDEB in apoptosis and lipid metabolism in the context of hepatitis C virus (HCV) replication. We demonstrate that HCV upregulates CIDEB expression in human serum differentiated hepatoma cells. CIDEB overexpression inhibits HCV replication in HCV replicon expressing Huh7.5 cells, while small interfering RNA knockdown of CIDEB expression in human serum differentiated hepatoma cells promotes HCV replication and secretion of viral proteins. Furthermore, we characterize a CIDEB mutant, KRRA, which is deficient in lipid droplet clustering and fusion and demonstrate that CIDEB-mediated inhibition of HCV is independent of the protein's lipid droplet fusogenic role. Our results suggest that higher levels of CIDEB expression, which favour an apoptotic role for the host factor, inhibit HCV. Collectively, our data demonstrate that CIDEB can act as an anti-HCV host factor and contribute to altered triglyceride homeostasis.
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Affiliation(s)
- Ragunath Singaravelu
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ontario, Canada; National Research Council of Canada, Ottawa, Ontario, Canada
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