Critical role of cellular cholesterol in bovine rotavirus infection
- Jin Cui†1,
- Xinliang Fu†1,
- Jiexiong Xie†1,
- Ming Gao1,
- Malin Hong1,
- Yao Chen1,
- Shuo Su1 and
- Shoujun Li1Email author
© Cui et al.; licensee BioMed Central Ltd. 2014
Received: 19 February 2014
Accepted: 21 May 2014
Published: 23 May 2014
Bovine rotavirus (BRV) is a non-enveloped dsRNA virus that cause neonatal calf diarrhea. Lipid rafts are cholesterol-enrich membrane mircodomains that play a vital role in many cellular processes. In this study, the effect of cellular cholesterol depletion on infection of MA-104 cells with bovine rotavirus was investigated.
We demonstrated that cholesterol depletion of the plasma membrane by MβCD had no effect on BRV binding to cells but significantly impaired BRV entry in a dose-dependent manner and the effect was partially reversed by addition of exogenous cholesterol, suggesting the reduction of BRV infection by MβCD was specifically due to cholesterol depletion. Cholesterol depletion after virus entry did not reduce BRV replication, whereas affected virus assembly.
Taken together, our results demonstrate that cell membrane cholesterol is essential to BRV infectivity.
Bovine Group A rotavirus (BRV), a member of the Reoviridae family, is recognized as a major agent of neonatal calf diarrhea that causes severe diarrhoea, dehydration, anorexia and death in newborn calves . Rotavirus is a non-enveloped double-stranded RNA virus that consists of 6 structural (VP1-VP4, VP6 and VP7) and 5 or 6 nonstructural proteins (NSP1-6) [2, 3]. Rotaviruses are classified into G and P genotypes based on the genetic variation of VP7 (Glycoprotein) and VP4 (Protease sensitive protein) outer capsid proteins, respectively . To date, 27 G and 37 P types have been recognized. The G6, G8 and G10 in combination with the P (1), P (5) and P (11) genotypes are prevalent in cattle among the world [4–7]. A recent study revealed that some BRV strains could transmit directly to human infants and cause diarrhea . The emergence of novel strains and the risks of interspecies transmission are of great concern.
Lipid rafts are specialized membrane microdomains that are enriched in sphingolipids, cholesterol, SRC family protein kinases, and glycosylphosphatidylinositol (GPI)-anchored proteins, cholesterol is essential in lipid raft membranes [9, 10]. Lipid rafts are associated with regulation of various physiological processes, such as lipid sorting, protein trafficking , cell polarization and signal transduction . For virus, cholesterol-enrich membrane mircodomains play an important role in multiple stages of virus life cycle, including entry, fusion, replication, assembly and budding [13–15]. Numerous studies have demonstrated that the cellular cholesterol was required for infection of many viruses, such as PRRSV , TGEV , bovine herpesvirus type 1 (BoHV-1) , murine leukemia virus  and simian virus 40 (SV40) , whereas influenza virus infection is independent of cell cholesterol . Previous studies have found that lipid membrane microdomains are indispensable to the infection of simian, porcine and human rotaviruses [22–25]. In addition, bovine rotavirus UK strain seem to enter the cell through clathrin-mediated endocytosis . However, whether cellular cholesterol impact other stages of BRV life cycle remains unclear.
In this study we explored whether cellular cholesterol depletion affects BRV infection, furthermore, the stage of BRV infection cycle which depends on cell cholesterol has also been determined. Using Methyl-β-cyclodextrin (MβCD), a pharmacological cholesterol depletion agent, we found that cellular cholesterol affected BRV entry but not virus binding, and the inhibitory effect was partially reversed by exogenous cholesterol replenishment. Intact cell membrane cholesterol was dispensable for the virus replication. However, virus assembly was in a cholesterol-dependent pathway. These results suggested that cellular cholesterol is required for BRV infection.
Cholesterol depletion had no effect on BRV binding
Cholesterol depletion impaired BRV entry into MA-104 cells
The inhibitive effect was partially reversed by cholesterol replenishment
Effect of cellular cholesterol depletion on post-entry process
Rotaviruses are the major cause of severe acute dehydrating diarrhea in humans and animals worldwide . In vitro, African green monkey kidney cell (MA104) is the most commonly used cell in rotavirus propagation. Rotavirus entry is an organized multistep process, it has been demonstrated that rotaviruses enter the cell through direct penetration or by receptor-mediated endocytosis [27, 28]. N-acetylneuraminic (sialic) acid residues, integrins α2β1, α4β1, αvβ3, αxβ2, heat shock cognate protein (hsc) 70 and certain gangliosides were identified as cellular molecules which were responsible for rotavirus entry [29, 30]. Previous research indicated that cellular cholesterol is required for infection of some rotavirus species [22–25]. Meanwhile, cholesterol depletion impairs the entry of BRV UK strain . However, BRV strains have various VP4 (P-types) and VP7 (G-types) genotypes and they were clustered into different lineages . In addition, whether cholesterol affects BRV attachment or after-entry stage have not been reported. In this study, the critical role of cellular cholesterol on specific phase of BRV CH-12 strain was investigated, we found that the cellular cholesterol is sensitive to MβCD treatment. With the treatment of increasing concentrations of MβCD the cholesterol content of plasma membrane was decreased in a dose-dependent manner, and replenishing cellular membrane with exogenous cholesterol partially restored the cholesterol level. In order to determine which stage of BRV life cycle is affected by cholesterol depletion, we first examined the effect of cellular cholesterol depletion on virus binding, the results showed that BRV attachment was independent to cholesterol. However, when cells were treated with MβCD prior to virus entry, BRV infection was decreased with the reduction of cellular cholesterol level in a dose-dependent fashion. The replenishing of exogenous cholesterol enhanced the infectivity of BRV. To investigate whether cholesterol depletion affects virus entry or replication, cells were treated with MβCD after BRV entry, the result revealed that there were no significant differences of viral mRNA and protein levels between treated cells and mock cells. These results indicated that cholesterol depletion from cellular membrane did not affect the replication of BRV but virus entry. As reported, lipid raft is involved in several viruses entry into cells, such as PRRSV , BoHV-1 , human enterovirus , poliovirus  and canine distemper virus , cellular receptors of several viruses are localized in the lipid rafts. Although diverse rotaviruse species interact with different cell-surface molecules, some of these molecules are localized in the lipid rafts . Hence, cholesterol depletion from cellular membrane influences BRV entry by disturbing lipid-raft-dependent endocytosis. Our results showed that cholesterol depletion had no effect on BRV replication, suggesting that virus replication is independent of lipid rafts, and it is in accordance with the former reports for other viruses [16, 18].
Previous study demonstrated that Lovastatin-treated cells increased the levels of simian rotavirus proteins . In the present work, we found that the synthesis of viral mRNA and protein were not affected when cells were treated with MβCD after virus entry, but the virus titers were obviously decreased, it appears that cholesterol-rich microdomains may contribute to assembly or budding of BRV. Lipids membrane microdomains play an important role in numerous cellular functions such as signal transduction, membrane transport and trafficking  and provide platforms for assembly or budding of many enveloped viruses such as influenza virus , HIV  and morbillivirus measles virus . The mechanism of noneveloped viruses assembly and release is still poorly understood. The release of some noneveloped viruses from cells does not involve cell lysis. Virions transported to specific plasma membrane domains through vesicular transport, inhibition of the accumulation of virus on cell surfaces did not affect viral RNA and protein synthesis but block virus release [40, 41]. Recently, compounds that could inhibit rotavirus viroplasm formation and decrease the amount of infectious progeny by disrupting lipid droplets (LDs) or fatty acid synthesis were reported [42, 43]. In Caco-2 Cells, rotavirus VP4 protein has been demonstrated to directly interact with lipid microdomains. At the final stage of assembly, VP4 incorporates into preformed viral particles, lipid rafts provide a platform for the formation of infectious virions . These data indicated that lipid rafts disrupted by MβCD impaired the mature of BRV particles and decreased the virus titers.
In conclusion, our results suggested that lipid rafts play a vital role in BRV infection and plasma membrane cholesterol was essential to BRV entry and assembly.
Materials and methods
Cells, viruses and chemicals
MA-104 African green monkey cells were maintained in DMEM containing 10% fetal bovine serum, and 1% penicillin/streptomycin. The BRV strain CH12 (kindly provided by Dr. Kun Jia, South China Agricultural University) was propagated in MA-104 cells in the presence of trypsin (final concentration was 5 mg/mL) at a multiplicity of infection (MOI) of 0.1. Methyl-β-cyclodextrin (MβCD) and cholesterol were purchased from Sigma-Aldrich (Sigma-Aldrich, St. Louis, MO, USA). The reagents were dissolved in water and diluted in serum-free DMEM.
Depletion and replenishment of cholesterol
In order to deplete cholesterol, the cells were treated with increasing concentrations of MβCD (0, 2.5, 5, 10 and 15 mM) at 37°C for 30 min. For cholesterol replenishment, MA-104 cells were pretreated with 10 mM MβCD at 37°C for 30 min, after washing, the cells were incubated with 1.5 mg/ml exogenous cholesterol for 1 h at 37°C.
Toxicity of MβCD and cholesterol quantification
The cell viability was measured by Cell Counting Kit (CCK-8) (Dojindo, Japan) following the manufacturer’s instructions. Briefly, MA-104 cells cultured in 96-well plates were treated without or with various concentrations of MβCD at 37°C for 30 min. Subsequently, 10 μl of the CCK-8 solution was added to each well and incubated at 37°C for 1 h, the optical density (OD) value of the wells at a wavelength of 450 nm was measured using a microplate reader (Bio-Rad, USA). Relative cell viability rate was determined for each concentration as [(OD experiment - OD blank)/(OD control - OD blank) × 100], all experiments were repeated three independent times.
To determine the cellular cholesterol level, the cholesterol-depleted or cholesterol-replenished cells were collected and diluted in 1X Amplex Red Reaction Buffer. The concentration of cholesterol was detected by the Amplex Red cholesterol Assay Kit (Life Technologies, USA) according to the manufacturer’s instructions.
Effect of cholesterol depletion on virus binding
In order to examine if cholesterol depletion affects BRV binding to MA-104 cells, the monolayer cells seeded in 12-well plates were incubated with indicated concentrations of MβCD at 37°C for 30 min, and then infected with BRV at a multiplicity of infection (MOI) of 0.1 at 4°C for 1 h. After removing the unbound virus with PBS, cell lysates were prepared by freeze-thaw three times and virus titers were determined.
Effect of cholesterol depletion on the BRV entry
To determine the effect of cellular cholesterol depletion on virus entry, the monolayer MA-104 cells cultured in 12-well plates were mock treated or treated with various concentrations of MβCD at 37°C for 30 min, then incubated with BRV at a MOI of 0.1 at 37°C. One hour later, cells were washed three times with PBS and supplied with serum-free medium, virus titers and viral mRNA levels were quantified at 12 hours post infection.
For cholesterol replenishment assay, the MA-104 cells were pretreated with 10 mM MβCD for 30 min, then incubated with cholesterol at a concentration of 1.5 mg/ml for 1 h. After washing, the cells were infected with BRV. At 12 hpi, virus titers were calculated.
Cells were infected with BRV at 4°C for 1 h. After binding, cells were washed with PBS to remove unbound virus, then shifted to 37°C (set as 0 h) to allow virus internalization. 30 mM MβCD was added at 0, 0.5, 1, 2, 4 and 6 h. At 12 h post infection, cells were harvested and subjected to Western blot assay.
Effect of cholesterol depletion on post-entry stage of BRV infection
In order to analyze whether cholesterol depletion could affect virus infectivity after virus entry, MA-104 cells seeded in 12-well plates were infected with BRV for 1 h at 37°C, then mock treated or treated with various concentrations of MβCD at 37°C for 30 min. After washing, cells were kept in serum-free medium for 12 h, the virus titers and mRNA levels were determined.
The monolayer MA104 cells seeded in 96-well plates were infected with serially 10-fold diluted virus. After 48 h, the level of virus infection was determined by cytopathic effect (CPE), virus titers were calculated by the Reed and Muench method and expressed as 50% tissue culture infective dose (TCID50) per ml.
Total RNA was isolated using TRIzol reagent (Life Technologies, USA) and treated with RNA-free DNase (Roche) to eliminate possible DNA contamination. Reverse transcription was carried out by using Revert Aid First Strand cDNA Synthesis Kit (Thermo Scientific). The Realtime PCR was done with the SYBR Select Master Mix (Applied Biosystems, USA) according to manufacturer’s instructions. The primer set designed for BRV VP7 gene contains BRV-VP7-F (5′-TAA ATG GAT ATC AAT GGG TT-3′) and BRV-VP7-R (5′-AAC GTC AGT AAT TAC CAG C-3′), and the primer set designed for β-actin gene contains β-actin-F (5′-TCG ATC ATG AAG TGC GA CGT G-3′) and β-actin-R (5′-GTG ATC TCC TTC TGC ATC CTG TC-3′). The PCR reaction was performed with ABI7500 Fast Realtime PCR (Applied Biosystems, USA). Relative levels of viral mRNA were calculated using the 2-ΔΔCT method of relative quantification with β-actin as the internal control for normalization.
Cells were harvested in Laemmli sample buffer and subjected to SDS-PAGE, then transferred to a nitrocellulose membrane (Millipore). The membrane was blocked with 5% nonfat dry milk in TBS and incubated with the polyclonal antibody against BRV VP4 protein, anti-rabbit IgG (H + L) (DyLight 800 Conjugate) was used as secondaryantibody (Cell Signaling). The blots were developed using LI-COR Odyssey System (LI-COR).
The data were presented as mean ± standard deviations (SD) of three independent experiments. The differences between groups were assessed by Student’s t test. A P value < 0.05 was considered statistical significant. All statistical analyses were performed using GraphPad Prism.
This work is supported by the Guangdong Science and Technology Research Program (NO. 2012B040302003), The funding organizations had no role in the study design, data collection and analysis, ownership of the materials, or preparation of the manuscript.
- Athanassious R, Marsolais G, Assaf R, Dea S, Descoteaux JP, Dulude S, Montpetit C: Detection of bovine coronavirus and type A rotavirus in neonatal calf diarrhea and winter dysentery of cattle in Quebec: evaluation of three diagnostic methods. Can Vet J 1994, 35: 163-169.PubMedPubMed CentralGoogle Scholar
- Ha TP, Kim HJ, Saif LJ, Jeong YJ, Kim HH, Kwon HJ, Park SJ, Cho KO: Sequence analysis of unusual PG5 bovine rotavirus strains reveals evidence of interspecies transmission. J Clin Microbiol 2009, 47: 3329-3332. 10.1128/JCM.01583-08PubMedPubMed CentralView ArticleGoogle Scholar
- Martel-Paradis O, Laurin MA, Martella V, Sohal JS, L’Homme Y: Full-length genome analysis of G2, G9 and G11 porcine group A rotaviruses. Vet Microbiol 2013, 162: 94-102. 10.1016/j.vetmic.2012.08.028PubMedView ArticleGoogle Scholar
- Matthijnssens J, Ciarlet M, McDonald SM, Attoui H, Banyai K, Brister JR, Buesa J, Esona MD, Estes MK, Gentsch JR, Iturriza-Gómara M, Johne R, Kirkwood CD, Martella V, Mertens PP, Nakagomi O, Parreño V, Rahman M, Ruggeri FM, Saif LJ, Santos N, Steyer A, Taniguchi K, Patton JT, Desselberger U, Van Ranst M: Uniformity of rotavirus strain nomenclature proposed by the Rotavirus Classification Working Group (RCWG). Arch Virol 2011, 156: 1397-1413. 10.1007/s00705-011-1006-zPubMedPubMed CentralView ArticleGoogle Scholar
- Alkan F, Ozkul A, Oguzoglu TC, Timurkan MO, Caliskan E, Martella V, Burgu I: Distribution of G (VP7) and P (VP4) genotypes of group A bovine rotaviruses from Turkish calves with diarrhea, 1997–2008. Vet Microbiol 2010, 141: 231-237. 10.1016/j.vetmic.2009.09.016PubMedView ArticleGoogle Scholar
- Cashman O, Lennon G, Sleator RD, Power E, Fanning S, O’Shea H: Changing profile of the bovine rotavirus G6 population in the south of Ireland from 2002 to 2009. Vet Microbiol 2010, 146: 238-244. 10.1016/j.vetmic.2010.05.012PubMedView ArticleGoogle Scholar
- Suzuki Y, Sanekata T, Sato M, Tajima K, Matsuda Y, Nakagomi O: Relative frequencies of G (VP7) and P (VP4) serotypes determined by polymerase chain reaction assays among Japanese bovine rotaviruses isolated in cell culture. J Clin Microbiol 1993, 31: 3046-3049.PubMedPubMed CentralGoogle Scholar
- Doan YH, Nakagomi T, Aboudy Y, Silberstein I, Behar-Novat E, Nakagomi O, Shulman LM: Identification by full-genome analysis of a bovine rotavirus transmitted directly to and causing diarrhea in a human child. J Clin Microbiol 2013, 51: 182-189. 10.1128/JCM.02062-12PubMedPubMed CentralView ArticleGoogle Scholar
- Simons K, Ikonen E: Functional rafts in cell membranes. Nature 1997, 387: 569-572. 10.1038/42408PubMedView ArticleGoogle Scholar
- Simons K, van Meer G: Lipid sorting in epithelial cells. Biochemistry 1988, 27: 6197-6202. 10.1021/bi00417a001PubMedView ArticleGoogle Scholar
- Mayor S, Riezman H: Sorting GPI-anchored proteins. Nat Rev Mol Cell Biol 2004, 5: 110-120. 10.1038/nrm1309PubMedView ArticleGoogle Scholar
- Parton RG, Hancock JF: Lipid rafts and plasma membrane microorganization: insights from Ras. Trends Cell Biol 2004, 14: 141-147. 10.1016/j.tcb.2004.02.001PubMedView ArticleGoogle Scholar
- Nayak DP, Barman S: Role of lipid rafts in virus assembly and budding. Adv Virus Res 2002, 58: 1-28.PubMedView ArticleGoogle Scholar
- Ono A, Freed EO: Role of lipid rafts in virus replication. Adv Virus Res 2005, 64: 311-358.PubMedView ArticleGoogle Scholar
- Schmitt AP, Lamb RA: Influenza virus assembly and budding at the viral budozone. Adv Virus Res 2005, 64: 383-416.PubMedView ArticleGoogle Scholar
- Huang L, Zhang YP, Yu YL, Sun MX, Li C, Chen PY, Mao X: Role of lipid rafts in porcine reproductive and respiratory syndrome virus infection in MARC-145 cells. Biochem Biophys Res Commun 2011, 414: 545-550. 10.1016/j.bbrc.2011.09.109PubMedView ArticleGoogle Scholar
- Ren X, Glende J, Yin J, Schwegmann-Wessels C, Herrler G: Importance of cholesterol for infection of cells by transmissible gastroenteritis virus. Virus Res 2008, 137: 220-224. 10.1016/j.virusres.2008.07.023PubMedView ArticleGoogle Scholar
- Zhu L, Ding X, Tao J, Wang J, Zhao X, Zhu G: Critical role of cholesterol in bovine herpesvirus type 1 infection of MDBK cells. Vet Microbiol 2010, 144: 51-57. 10.1016/j.vetmic.2009.12.031PubMedView ArticleGoogle Scholar
- Lu X, Xiong Y, Silver J: Asymmetric requirement for cholesterol in receptor-bearing but not envelope-bearing membranes for fusion mediated by ecotropic murine leukemia virus. J Virol 2002, 76: 6701-6709. 10.1128/JVI.76.13.6701-6709.2002PubMedPubMed CentralView ArticleGoogle Scholar
- Anderson HA, Chen Y, Norkin LC: Bound simian virus 40 translocates to caveolin-enriched membrane domains, and its entry is inhibited by drugs that selectively disrupt caveolae. Mol Biol Cell 1996, 7: 1825-1834. 10.1091/mbc.7.11.1825PubMedPubMed CentralView ArticleGoogle Scholar
- Sun X, Whittaker GR: Role for influenza virus envelope cholesterol in virus entry and infection. J Virol 2003, 77: 12543-12551. 10.1128/JVI.77.23.12543-12551.2003PubMedPubMed CentralView ArticleGoogle Scholar
- Guerrero CA, Zarate S, Corkidi G, Lopez S, Arias CF: Biochemical characterization of rotavirus receptors in MA104 cells. J Virol 2000, 74: 9362-9371. 10.1128/JVI.74.20.9362-9371.2000PubMedPubMed CentralView ArticleGoogle Scholar
- Sanchez-San MC, Lopez T, Arias CF, Lopez S: Characterization of rotavirus cell entry. J Virol 2004, 78: 2310-2318. 10.1128/JVI.78.5.2310-2318.2004View ArticleGoogle Scholar
- Isa P, Realpe M, Romero P, Lopez S, Arias CF: Rotavirus RRV associates with lipid membrane microdomains during cell entry. Virology 2004, 322: 370-381. 10.1016/j.virol.2004.02.018PubMedView ArticleGoogle Scholar
- Cuadras MA, Greenberg HB: Rotavirus infectious particles use lipid rafts during replication for transport to the cell surface in vitro and in vivo. Virology 2003, 313: 308-321. 10.1016/S0042-6822(03)00326-XPubMedView ArticleGoogle Scholar
- Gutierrez M, Isa P, Sanchez-San MC, Perez-Vargas J, Espinosa R, Arias CF, Lopez S: Different rotavirus strains enter MA104 cells through different endocytic pathways: the role of clathrin-mediated endocytosis. J Virol 2010, 84: 9161-9169. 10.1128/JVI.00731-10PubMedPubMed CentralView ArticleGoogle Scholar
- Fukuhara N, Yoshie O, Kitaoka S, Konno T, Ishida N: Evidence for endocytosis-independent infection by human rotavirus. Arch Virol 1987, 97: 93-99. 10.1007/BF01310737PubMedView ArticleGoogle Scholar
- Sapin C, Colard O, Delmas O, Tessier C, Breton M, Enouf V, Chwetzoff S, Ouanich J, Cohen J, Wolf C, Trugnan G: Rafts promote assembly and atypical targeting of a nonenveloped virus, rotavirus, in Caco-2 cells. J Virol 2002, 76: 4591-4602. 10.1128/JVI.76.9.4591-4602.2002PubMedPubMed CentralView ArticleGoogle Scholar
- Isa P, Arias CF, Lopez S: Role of sialic acids in rotavirus infection. Glycoconj J 2006, 23: 27-37. 10.1007/s10719-006-5435-yPubMedView ArticleGoogle Scholar
- Taube S, Jiang M, Wobus CE: Glycosphingolipids as receptors for non-enveloped viruses. Viruses 2010, 2: 1011-1049. 10.3390/v2041011PubMedPubMed CentralView ArticleGoogle Scholar
- Jere KC, Esona MD, Ali YH, Peenze I, Roy S, Bowen MD, Saeed IK, Khalafalla AI, Nyaga MM, Mphahlele J, Steele D, Seheri ML: Novel NSP1 genotype characterised in an African camel G8P rotavirus strain. Infect Genet Evol 2014, 21: 58-66.PubMedView ArticleGoogle Scholar
- Stuart AD, Eustace HE, McKee TA, Brown TD: A novel cell entry pathway for a DAF-using human enterovirus is dependent on lipid rafts. J Virol 2002, 76: 9307-9322. 10.1128/JVI.76.18.9307-9322.2002PubMedPubMed CentralView ArticleGoogle Scholar
- Danthi P, Chow M: Cholesterol removal by methyl-beta-cyclodextrin inhibits poliovirus entry. J Virol 2004, 78: 33-41. 10.1128/JVI.78.1.33-41.2004PubMedPubMed CentralView ArticleGoogle Scholar
- Imhoff H, von Messling V, Herrler G, Haas L: Canine distemper virus infection requires cholesterol in the viral envelope. J Virol 2007, 81: 4158-4165. 10.1128/JVI.02647-06PubMedPubMed CentralView ArticleGoogle Scholar
- Mohan KV, Muller J, Atreya CD: Defective rotavirus particle assembly in lovastatin-treated MA104 cells. Arch Virol 2008, 153: 2283-2290. 10.1007/s00705-008-0261-0PubMedView ArticleGoogle Scholar
- Ikonen E: Roles of lipid rafts in membrane transport. Curr Opin Cell Biol 2001, 13: 470-477. 10.1016/S0955-0674(00)00238-6PubMedView ArticleGoogle Scholar
- Scheiffele P, Rietveld A, Wilk T, Simons K: Influenza viruses select ordered lipid domains during budding from the plasma membrane. J Biol Chem 1999, 274: 2038-2044. 10.1074/jbc.274.4.2038PubMedView ArticleGoogle Scholar
- Campbell SM, Crowe SM, Mak J: Lipid rafts and HIV-1: from viral entry to assembly of progeny virions. J Clin Virol 2001, 22: 217-227. 10.1016/S1386-6532(01)00193-7PubMedView ArticleGoogle Scholar
- Vincent S, Gerlier D, Manie SN: Measles virus assembly within membrane rafts. J Virol 2000, 74: 9911-9915. 10.1128/JVI.74.21.9911-9915.2000PubMedPubMed CentralView ArticleGoogle Scholar
- Clayson ET, Brando LV, Compans RW: Release of simian virus 40 virions from epithelial cells is polarized and occurs without cell lysis. J Virol 1989, 63: 2278-2288.PubMedPubMed CentralGoogle Scholar
- Tucker SP, Thornton CL, Wimmer E, Compans RW: Vectorial release of poliovirus from polarized human intestinal epithelial cells. J Virol 1993, 67: 4274-4282.PubMedPubMed CentralGoogle Scholar
- Gaunt ER, Cheung W, Richards JE, Lever A, Desselberger U: Inhibition of rotavirus replication by downregulation of fatty acid synthesis. J Gen Virol 2013, 94: 1310-1317. 10.1099/vir.0.050146-0PubMedView ArticleGoogle Scholar
- Cheung W, Gill M, Esposito A, Kaminski CF, Courousse N, Chwetzoff S, Trugnan G, Keshavan N, Lever A, Desselberger U: Rotaviruses associate with cellular lipid droplet components to replicate in viroplasms, and compounds disrupting or blocking lipid droplets inhibit viroplasm formation and viral replication. J Virol 2010, 84: 6782-6798. 10.1128/JVI.01757-09PubMedPubMed CentralView ArticleGoogle Scholar
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.