Publications

TitleAbstractYear(sorted descending)
Filter
PMID
Filter
processing of the vp1/2a junction is not necessary for production of foot-and-mouth disease virus empty capsids and infectious viruses: characterization of "self-tagged" particles.the foot-and-mouth disease virus (fmdv) capsid protein precursor, p1-2a, is cleaved by 3c(pro) to generate vp0, vp3, vp1, and the peptide 2a. the capsid proteins self-assemble into empty capsid particles or viruses which do not contain 2a. in a cell culture-adapted strain of fmdv (o1 manisa [lindholm]), three different amino acid substitutions (e83k, s134c, and k210e) were identified within the vp1 region of the p1-2a precursor compared to the field strain (wild type [wt]). expression of the o1 ...201323966400
a role for endoplasmic reticulum exit sites in foot-and-mouth disease virus infection.picornaviruses replicate their genomes in association with cellular membranes. while enteroviruses are believed to utilize membranes of the early secretory pathway, the origin of the membranes used by foot-and-mouth disease virus (fmdv) for replication are unknown. secretory-vesicle traffic through the early secretory pathway is mediated by the sequential acquisition of two distinct membrane coat complexes, copii and copi, and requires the coordinated actions of sar1, arf1 and rab proteins. sar1 ...201323963534
development of a luminex assay for the detection of swine antibodies to non-structural proteins of foot-and-mouth disease virus.foot-and mouth disease (fmd), swine vesicular disease (svd), and vesicular stomatitis (vs) are highly contagious vesicular diseases of swine but are not easy to differentiate clinically. for the purpose of instant detecting of fmd and differentiating it from the other vesicular diseases, a luminex assay was developed. sera from 64 infected, 307 vaccinated, and 280 naïve pigs were tested by the luminex assay. diagnostic sensitivity of the assay was 100%. diagnostic specificity of the assay was 98 ...201323962586
two new flavonol glycosides and biological activities of diplotaxis harra (forssk.) boiss.two new flavonol glycosides, isorhamnetin 3-o-β-glucopyranoside-4'-o-β-xylopyranoside (1) and kaempferol 3-o-β-glucopyranoside -4'-o-β-xylopyranoside (2), were isolated from the defatted aqueous methanol extract of the whole plant diplotaxis harra along with 12 known flavonols (3-14). they were characterised by chemical and spectral methods. the 70% aqueous methanol, chloroform and defatted aqueous methanol plant extracts exhibited significant antioxidant effects (nitroblue tetrazolium reduction ...201323962320
co-administration of flagellin augments immune responses to inactivated foot-and-mouth disease virus (fmdv) antigen.foot-and-mouth disease virus (fmdv) is one of the most contagious animal virus known that affects livestock health and production. this study aimed to investigate the effect of flagellin, a toll-like receptor 5 agonist, on the immune responses to inactivated fmdv antigen in guinea pig model. our results showed that the co-administration of flagellin with fmdv antigen through intradermal route induces earlier and higher anti-fmdv neutralizing antibody responses as compared to fmdv antigen alone. ...201323941960
reconstructing the origin and transmission dynamics of the 1967-68 foot-and-mouth disease epidemic in the united kingdom.a large epidemic of foot-and-mouth disease (fmd) occurred in the united kingdom (uk) over a seven month period in northwest england from late 1967 to the summer of 1968. this was preceded by a number of smaller fmd outbreaks in the country, two in 1967, in hampshire and warwickshire and one in northumberland during 1966. the causative agent of all four events was identified as fmd virus (fmdv) serotype o and the source of the large epidemic was attributed to infected bone marrow in lamb products ...201324035793
development of a peptide based latex agglutination assay for serotype identification of foot and mouth disease virus.out of 200 serum samples collected from cattle (142) and buffaloes (58) of various ages and sexand subjected to latex agglutination test (lat) using serotype specific peptides (o, a, asia 1) and also with peptide for non-structural protein 2b (nsp-2b), 114 (70%) samples were positive against fmdv type 'o', 102 (51%) against serotype 'a' and 104 (52%) against serotype 'asia 1'. with nsp-2b peptide a total of 71 (35.5%) samples were positive. the results suggest that lat could be used for the diag ...201323923605
a partial deletion in non-structural protein 3a can attenuate foot-and-mouth disease virus in cattle.the role of non-structural protein 3a of foot-and-mouth disease virus (fmdv) on the virulence in cattle has received significant attention. particularly, a characteristic 10-20 amino acid deletion has been implicated as responsible for virus attenuation in cattle: a 10 amino acid deletion in the naturally occurring, porcinophilic fmdv o1 taiwanese strain, and an approximately 20 amino acid deletion found in egg-adapted derivatives of fmdv serotypes o1 and c3. previous reports using chimeric viru ...201324074589
phylogeny and genetic diversity of foot and mouth disease virus serotype asia1 in india during 1964-2012.foot and mouth disease virus (fmdv) serotype asia1 was first identified in india in 1951 and since then causing significant proportion of fmd outbreaks in the country. in this paper genetic analysis of 219 isolates from india collected over a period of 48 years is described. bayesian approach was used to estimate the date of divergence and evolutionary rate. phylogenetic analysis indicated the circulation of three lineages (b, c and d) of which lineage b formed one genotype (i) which was prevale ...201324060099
characterization of a nuclear localization signal in the foot-and-mouth disease virus polymerase.we have experimentally tested whether the mrktklapt sequence in fmdv 3d protein (residues 16 to 24) can act as a nuclear localization signal (nls). mutants with substitutions in two basic residues within this sequence, k18e and k20e, were generated. a decreased nuclear localization was observed in transiently expressed 3d and its precursor 3cd, suggesting a role of k18 and k20 in nuclear targeting. fusion of mrktklapt to the green fluorescence protein (gfp) increased the nuclear localization of ...201323886493
an increased replication fidelity mutant of foot-and-mouth disease virus retains fitness in vitro and virulence in vivo.in a screen for rna mutagen-resistant foot-and-mouth disease virus (fmdv) strains, we isolated an fmdv mutant with rna-dependent rna polymerase (rdrp) r84h substitution. this mutant, selected under the mutagenic pressure of 5-fluorouracil (5-fu), is resistant not only to 5-fu but also to other two rna mutagens, 5-azacytidine and ribavirin, suggesting that the rdrp r84h mutant is a high fidelity variant. subsequently, the increased fidelity of this mutant was verified through analysis of mutation ...201323880348
protein coexpression using fmdv 2a: effect of "linker" residues.many biomedical applications absolutely require, or are substantially enhanced by, coexpression of multiple proteins from a single vector. foot-and-mouth disease virus 2a (f2a) and "2a-like" sequences (e.g., thosea asigna virus 2a; t2a) are used widely for this purpose since multiple proteins can be coexpressed by linking open reading frames (orfs) to form a single cistron. the activity of f2a "cleavage" may, however, be compromised by both the use of shorter versions of f2a and the sequences (d ...201323878801
foot-and-mouth disease virus-like particles produced by a sumo fusion protein system in escherichia coli induce potent protective immune responses in guinea pigs, swine and cattle.foot-and-mouth disease virus (fmdv) causes a highly contagious infection in cloven-hoofed animals. the format of fmd virus-like particles (vlp) as a non-replicating particulate vaccine candidate is a promising alternative to conventional inactivated fmdv vaccines. in this study, we explored a prokaryotic system to express and assemble the fmd vlp and validated the potential of vlp as an fmdv vaccine candidate. vlp composed entirely of fmdv (asia1/jiangsu/china/2005) capsid proteins (vp0, vp1 and ...201323826638
sequence analysis of the foot and mouth disease virus type o/irn/2007 vp1 gene from iranian isolate.the foot and mouth disease virus (fmdv) causes a vesicular and contagious disease of cloven-hoofed animals. in this study, the virus was isolated from vesicles of the infected cattle using cell culture and serotyped by elisa test. the extracted rna from the infected cells was reverse transcribed and amplified using vp1 gene-specific primer pairs by means of one-step rt-pcr. the purified vp1 gene was sub-cloned into the uniqe kpni and bamhi cloning sites of the pcdna3.1+ vector. the dh5α strain o ...201323746175
characterization of asia 1 sdab from camels bactrianus (c. bactrianus) and conjugation with quantum dots for imaging fmdv in bhk-21 cells.foot-and-mouth disease (fmd), caused by fmd virus (fmdv), is a highly contagious viral disease affecting cloven-hoofed animals. camelids have a unique immunoglobulin profile, with the smallest functional heavy-chain antibodies (sdab or vhh) naturally devoid of light chains with antigen-binding capacity. we screened and characterized five sdabs against fmdv by immunized library from c. bactrianus with asia 1 virus-like particles (vlps). three of five recombinant sdabs were stably expressed in e.c ...201323737944
high-yield production of the vp1 structural protein epitope from serotype o foot-and-mouth disease virus in escherichia coli.for effective control of foot-and-mouth disease (fmd), the development of rapid diagnostic systems and vaccines are required against its etiological agent, fmd virus (fmdv). to accomplish this, efficient large-scale expression of the fmdv vp1 protein, with high solubility, needs to be optimized. we attempted to produce high levels of a serotype o fmdv vp1 epitope in escherichia coli. we identified the subtype-independent serotype o fmdv vp1 epitope sequence and used it to construct a glutathione ...201323619971
an adenovirus vectored mucosal adjuvant augments protection of mice immunized intranasally with an adenovirus-vectored foot-and-mouth disease virus subunit vaccine.foot-and-mouth disease virus (fmdv) is a highly contagious pathogen that causes severe morbidity and economic losses to the livestock industry in many countries. the oral and respiratory mucosae are the main ports of entry of fmdv, so the stimulation of local immunity in these tissues may help prevent initial infection and viral spread. e. coli heat-labile enterotoxin (lt) has been described as one of the few molecules that have adjuvant activity at mucosal surfaces. the objective of this study ...201323499593
equine picornaviruses: well known but poorly understood.of the many members that comprise the family picornaviridae, only two species are known to infect horses: equine rhinitis a virus (erav) and equine rhinitis b virus (erbv). each species now occupies a distinct phylogenetic branch within the family, with the single serotype of erav grouping with the aphthoviruses, such as foot-and-mouth disease virus (fmdv), and the three serotypes of erbv as the sole members of the genus erbovirus. the high seroprevalence of equine picornaviruses in horse popula ...201323820049
persistence and chronic urinary shedding of the aphthovirus equine rhinitis a virus.equine rhinitis a virus (erav) is a member of the aphthovirus genus, and has many physical and structural similarities to the prototype aphthovirus foot-and-mouth disease virus (fmdv). the pathogenesis of fmdv has been extensively studied, however, the similarities in the pathogenesis of erav and fmdv disease has not been well documented. this study describes and compares the pathogenesis of erav both in the natural host and a small animal model alternative (cba mice). distinct parallels in the ...201323183058
vp1 b-c and d-e loops of bovine enterovirus cluster b can effectively display foot-and-mouth disease virus type o-conserved neutralizing epitope.on the basis of generation of an infectious cdna clone for the bhm26 strain of bovine enterovirus cluster b (bev-b), 22 sites on different loops of the bhm26 capsid were selected according to an alignment of its sequence with the structural motifs of bev-a strain vg-5-27 for insertion of the foot-and-mouth disease virus (fmdv) type o-conserved neutralizing epitope 8e8. two recombinant viruses, rbev-a1 and rbev-de, in which the fmdv epitope was inserted into the vp1 b-c or d-e loops, were rescued ...201324077365
construction of a bovine enterovirus-based vector expressing a foot-and-mouth disease virus epitope.a recombinant infectious bovine enterovirus (bev) vector was constructed to express a foot-and-mouth disease virus (fmdv) capsid protein (vp1) epitope. sequences encoding the vp1 epitope (amino acid residues 141-160) of fmdv (vaccine strain o1/manisa/turkey/69) were inserted into pblubev at the vp1/2a junction. the growth characteristics of the parental virus and viruses derived from recombinant plasmids (pblubev, pblubev-manisa-epi) were determined by plaque assay and one-step growth curve anal ...201323391822
capsid coding sequences of foot-and-mouth disease viruses are determinants of pathogenicity in pigs.the surface exposed capsid proteins, vp1, vp2 and vp3, of foot-and-mouth disease virus (fmdv) determine its antigenicity and the ability of the virus to interact with host-cell receptors. hence, modification of these structural proteins may alter the properties of the virus.in the present study we compared the pathogenicity of different fmdvs in young pigs. in total 32 pigs, 7-weeks-old, were exposed to virus, either by direct inoculation or through contact with inoculated pigs, using cell cultu ...201222624592
mechanism of nucleic acid unwinding by sars-cov helicase.the non-structural protein 13 (nsp13) of severe acute respiratory syndrome coronavirus (sars-cov) is a helicase that separates double-stranded rna (dsrna) or dna (dsdna) with a 5' → 3' polarity, using the energy of nucleotide hydrolysis. we determined the minimal mechanism of helicase function by nsp13. we showed a clear unwinding lag with increasing length of the double-stranded region of the nucleic acid, suggesting the presence of intermediates in the unwinding process. to elucidate the natur ...201222615777
evaluation of a genetically modified foot-and-mouth disease virus vaccine candidate generated by reverse genetics.foot-and-mouth disease (fmd) is the most economically important and highly contagious disease of cloven-hoofed animals worldwide. control of the disease has been mainly based on large-scale vaccinations with whole-virus inactivated vaccines. in recent years, a series of outbreaks of type o fmd occurred in china (including chinese taipei, chinese hong kong) posed a tremendous threat to chinese animal husbandry. its causative agent, type o fmdv, has evolved into three topotypes (east-south asia (m ...201222591597
evaluation of the solid phase competition elisa for detecting antibodies against the six foot-and-mouth disease virus non-o serotypes.the solid-phase competition elisa (spce) has been evaluated in both screening and titration assay formats for detecting antibodies against foot-and-mouth disease virus (fmdv) for the six non-o serotypes a, c, sat 1, sat 2, sat 3 and asia 1. cut-off values were determined as a percentage inhibition of 40 for the sat serotypes and 50 for serotypes a, c and asia 1, which gave rise to specificity values ranging from 99.41% to 99.9% for the different serotypes. the relative sensitivity between the sp ...201222561986
[erratum: the following article was subsequently withdrawn by the authors. yarim gf, ciftci g (2011): investigation of serum protein profiles in sheep naturally infected with foot-and-mouth disease virus berl munch tierarztl wochenschr (5/6):194-197]. 201222550766
experimental foot-and-mouth disease virus infection in white tailed deer.white tailed deer (odocoileus virginianus) were inoculated with foot-and-mouth disease virus (fmdv) o ukg 11/2001 and monitored for the development of clinical signs, histopathological changes and levels of virus replication. all fmdv-infected deer developed clinical signs starting at 2 days post inoculation and characterized by an increase in body temperature, increased salivation and lesions in the mouth and on the feet. virus spread to various tissues was determined by quantifying the amount ...201222520809
insertion of type o-conserved neutralizing epitope into the foot-and-mouth disease virus type asia1 vp1 g-h loop: effect on viral replication and neutralization phenotype.previously, we finely mapped the neutralizing epitopes recognized by foot-and-mouth disease virus (fmdv) type asia1-specific mab 3e11 and fmdv type o-specific mab 8e8. in this study, we engineered recombinant fmdvs of the serotype asia1 (rfmdvs) displaying the type o-neutralizing epitope recognized by the mab 8e8. these epitope-inserted viruses were genetically stable and exhibited growth properties that were similar to those of their parental virus. importantly, the recombinant virus rfmdv-c sh ...201222513388
experimental infection of wild boar and domestic pigs with a foot and mouth disease virus strain detected in the southeast of bulgaria in december of 2010.foot and mouth disease (fmd) was detected in a wild boar in southeastern bulgaria in december 2010. the occurrence and spread of the disease in wild cloven-hoofed animals may pose an unexpected and significant threat to fmd virus (fmdv)-free areas within and outside the european union. so far, only one well documented experimental infection with fmd in wild boar has been published. in order to obtain more epidemiologically relevant data regarding the disease in wild boar we conducted an experime ...201222503391
upconversion nanoparticles modified with aminosilanes as carriers of dna vaccine for foot-and-mouth disease.the potential of the upconversion nanoparticles nayf(4):yb/er@silica(ucps)/plasmid dna (pcdna3.1/vp1-gfp) complex in inducing immune responses was evaluated using the ucps as carriers of the foot-and-mouth disease virus (fmdv asiai/jiangsu2005) dna vaccine. the ucps protection against dnasei degradation was measured using an in vitro inhibition assay. the expression of the plasmid in vivo was determined via confocal microscopy. its biocompatibility was evaluated through cytotoxicity assay. based ...201222476264
evolutionary trend of foot-and-mouth disease virus in hong kong.foot-and-mouth disease is an endemic animal disease in hong kong. in this study, a total of 70 clinical specimens were collected from locally infected pigs from 2001 to 2010. phylogenetic analysis of vp1 sequences reveal that all hong kong fmdv serotype o isolates are classified into three lineages: hk-a and hk-b in cathay topotype, and hk-c in sea topotype. regression analysis projects that the time of divergence from the most recent common ancestor of hk-a and hk-b are 1964 ± 12 and 1987 ± 9 y ...201222472703
emergence of antigenic variants with in serotype a foot and mouth disease virus in india and evaluation of a new vaccine candidate panel.emergence of genetically and antigenically divergent lineages/genotypes and poor intergenotypic antigenic coverage is a major concern in serotype a foot-and-mouth-disease virus (fmdv) in india. in 2009, to cover antigenic diversity emerged in serotype a virus field isolates, ind40/2000 was selected as the new vaccine strain for incorporation in the trivalent fmd vaccine formulation used in india. although current vaccine strain (ind40/2000) covers most isolates antigenically, a few vp3(59)-delet ...201222445197
inclusion of a specific t cell epitope increases the protection conferred against foot-and-mouth disease virus in pigs by a linear peptide containing an immunodominant b cell site.foot-and-mouth disease virus (fmdv) causes an economically important and highly contagious disease of cloven-hoofed animals. fmd control in endemic regions is implemented using chemically inactivated whole-virus vaccines. currently, efforts are directed to the development of safe and marked vaccines. we have previously reported solid protection against fmdv conferred by branched structures (dendrimeric peptides) harbouring virus-specific b and t-cell epitopes. in order to gain insights into the ...201222416886
molecular epidemiology of foot-and-mouth disease virus type a in south america.a databank of 78 vp(1) complete sequences of type a foot-and-mouth disease virus (fmdv) from south american isolates was constructed. forty-nine samples corresponded to fmdv that circulated between the years 1999-2008, mainly in venezuela, where most type a outbreaks have occurred lately and twenty-nine to strains historically relevant for the continent. the phylogenetic analysis showed that all south american fmdv belonged to the euro-sa topotype. sixteen subgenotypes could be identified, based ...201222397938
recombinant viral capsid protein vp1 suppresses migration and invasion of human cervical cancer by modulating phosphorylated prohibitin in lipid rafts.recombinant capsid protein vp1 (rvp1) of foot-and-mouth disease virus inhibits invasion/metastasis of cancer cells. here we studied its mechanism of action on human cervical cancer cells. the inhibition of cell invasion by rvp1 was accompanied with reduction in phosphatidylinositol (3,4,5)-triphosphate (pip3), phospho-akt s473, phosphorylated prohibitin (phospho-phb) t258 in lipid rafts, dissociation of phospho-phb t258 with raf-1 and the inactivation of raf-1/erk. addition of pip3 or overexpres ...201222388104
foot-and-mouth disease virus causes a decrease in spleen dendritic cells and the early release of ifn-α in the plasma of mice. differences between infectious and inactivated virus.foot-and-mouth disease (fmd) is a highly contagious and acute viral disease of cloven-hoofed animals. from an economical point of view, it is the most important disease of livestock worldwide. it is known that the virus interacts with dendritic cells, both in the natural host and in mice, but the impact of this interaction on the adaptive immune response is controversial. currently available vaccines are based on inactivated forms of the fmd virus. little is known about the differences between i ...201222387627
an alternate delivery system improves vaccine performance against foot-and-mouth disease virus (fmdv).foot-and-mouth disease virus (fmdv) causes vesicular disease of cloven-hoofed animals with severe agricultural and economic implications. one of the most highly infectious and contagious livestock pathogens known, the disease spreads rapidly in naïve populations making it critical to have rapidly acting vaccines. needle inoculation of killed virus vaccine is an efficient method of swiftly vaccinating large numbers of animals, either in eradication efforts or in outbreak situations in disease fre ...201222387223
application of the ceditest® fmdv type o and fmdv-ns enzyme-linked immunosorbent assays for detection of antibodies against foot-and-mouth disease virus in selected livestock and wildlife species in uganda.diagnosis and control of foot-and-mouth disease virus (fmdv) requires rapid and sensitive diagnostic tests. two antibody enzyme-linked immunosorbent assay (elisa) kits, ceditest® fmdv-ns for the detection of antibodies against the nonstructural proteins of all fmdv serotypes and ceditest® fmdv type o for the detection of antibodies against serotype o, were evaluated under african endemic conditions where the presence of multiple serotypes and the use of nonpurified vaccines complicate serologica ...201222379044
modelling the influence of foot-and-mouth disease vaccine antigen stability and dose on the bovine immune response.foot and mouth disease virus causes a livestock disease of significant global socio-economic importance. advances in its control and eradication depend critically on improvements in vaccine efficacy, which can be best achieved by better understanding the complex within-host immunodynamic response to inoculation. we present a detailed and empirically parametrised dynamical mathematical model of the hypothesised immune response in cattle, and explore its behaviour with reference to a variety of ex ...201222363437
direct contact transmission of three different foot-and-mouth disease virus strains in swine demonstrates important strain-specific differences.a novel direct contact transmission model for the study of foot-and-mouth disease virus (fmdv) infection of swine was utilized to investigate transmission characteristics of three fmdv strains belonging to serotypes a, o and asia1. each strain demonstrated distinct transmission characteristics and required different exposure times to achieve successful contact transmission. while a 4h exposure was sufficient for strain a24 cruzeiro (a24cru), both o1 manisa and asia1 shamir transmission required ...201222342891
a dna vaccination regime including protein boost and electroporation protects cattle against foot-and-mouth disease.protection against foot-and-mouth disease (fmd) using dna technology has been documented for sheep and pigs but not for the highly susceptible species of cattle. twenty-five holstein friesian cross-bred cattle were vaccinated twice, 21 days apart, with a dna vaccine containing the capsid coding region (p1) along with the non-structural proteins 2a, 3c and 3d (pcdna3.1/p1-2a3c3d) of o(1) kaufbeuren alone or coated onto plg (d,l-lactide-co-glycolide) microparticles. in some pcdna3.1/p1-2a3c3d was ...201222330893
adenovirus-vectored shrnas targeted to the highly conserved regions of vp1 and 2b in tandem inhibits replication of foot-and-mouth disease virus both in vitro and in vivo.foot-and-mouth disease is a highly contagious and economically important disease of cloven-hoofed animals. rna interference (rnai) can be used as a rapid and specific antiviral approach. it was shown that treatment with recombinant adenovirus (ad(vp1-2b)) carrying shrnas targeted to the vp1 and 2b genes of fmdv expressed in tandem had marked antiviral effects against fmdv both in ibrs-2 cells and guinea pigs. treatment with ad(vp1-2b) both before and after fmdv infection was most effective in ib ...201222327142
chimeric calicivirus-like particles elicit specific immune responses in pigs.virus-like particles (vlps) have received considerable attention due to their potential application in veterinary vaccines and, in particular, vlps from rabbit haemorrhagic disease virus (rhdv) have successfully shown to be good platforms for inducing immune responses against an inserted foreign epitope in mice. the aim of this study was to assess the immunogenicity of chimeric rhdv-vlps as vaccine vectors in pigs. for this purpose, we have generated chimeric vlps containing a well-known t epito ...201222306796
bovine type iii interferon significantly delays and reduces the severity of foot-and-mouth disease in cattle.interferons (ifns) are the first line of defense against viral infections. although type i and ii ifns have proven effective to inhibit foot-and-mouth disease virus (fmdv) replication in swine, a similar approach had only limited efficacy in cattle. recently, a new family of ifns, type iii ifn or ifn-λ, has been identified in human, mouse, chicken, and swine. we have identified bovine ifn-λ3 (boifn-λ3), also known as interleukin 28b (il-28b), and demonstrated that expression of this molecule usi ...201222301155
correlation between efficacy and structure of recombinant epitope vaccines against bovine type o foot and mouth disease virus.to develop recombinant epitope vaccines against foot-and-mouth disease virus (fmdv), genes coding for six recombinant proteins (rp1–rp6) consisting of different combinations of b cell and t cell epitope from vp1 capsid protein (vp1) of type o fmdv were constructed and the 3d structure of these proteins analyzed. this revealed a surface-exposed rgd sequence of b cell epitopes in all six recombinant proteins as that in vp1 of fmdv and rp1, rp2 and rp4 globally mimicked the backbone conformation of ...201222286179
serosurveillance for foot-and-mouth disease in mongolian gazelles (procapra gutturosa) and livestock on the eastern steppe of mongolia.foot-and-mouth disease (fmd) is a highly contagious, viral disease that affects most ruminant and porcine species, and periodic outbreaks on mongolia's eastern steppe affect mongolian gazelles (procapra gutturosa) and livestock. during 2005-08, we collected sera from 36 and 57 calf and adult gazelles, respectively, and from adult domestic animals sympatric with the gazelles, including 138 sheep (ovis aries), 140 goats (capra aegagrus hircus), 139 bactrian camels (camelus bactrianus), and 138 cat ...201222247371
early detection and visualization of human adenovirus serotype 5-viral vectors carrying foot-and-mouth disease virus or luciferase transgenes in cell lines and bovine tissues.recombinant replication-defective human adenovirus type 5 (ad5) vaccines containing capsid-coding regions from foot-and-mouth disease virus (fmdv) have been demonstrated to induce effective immune responses and provide homologous protective immunity against fmdv in cattle. however, basic mechanisms of ad5-fmdv vaccine function including virus tropism, transgene expression, and antigen presentation, remain incompletely understood. the current study characterized the dynamics of ad5 viral vector ( ...201222227230
a survey on the frequency of foot-and-mouth disease virus carriers in cattle in north-east of iran by rt-pcr: implications for revising disease control strategy.foot-and-mouth disease (fmd) is endemic in iran. it is essential to timely evaluate the current disease control programme in iran. here, we report the frequency of fmd virus (fmdv) carrier state in cattle slaughtered in mashhad abattoir, mashhad, khorasan razavi, north-east of iran, which contains long common borders with afghanistan and turkmenistan. soft palate samples were collected immediately after slaughter for the detection of fmdv by rt-pcr. the results show that 37.7% of cattle (96 of 2 ...201222222047
development of a foot-and-mouth disease virus serotype a empty capsid subunit vaccine using silkworm (bombyx mori) pupae.foot-and-mouth disease (fmd) is a highly contagious disease of cloven-hoofed animals that inflicts severe economic losses in the livestock industry. in 2009, fmdv serotype a caused outbreaks of fmd in cattle in china. although an inactivated virus vaccine has proven effective to control fmd, its use may lead to new disease outbreaks due to a possible incomplete inactivation of the virus during the manufacturing process. here, we expressed the p1-2a and the 3c coding regions of a serotype a fmdv ...201222952788
robust expression and secretion of xylanase1 in chlamydomonas reinhardtii by fusion to a selection gene and processing with the fmdv 2a peptide.microalgae have recently received attention as a potential low-cost host for the production of recombinant proteins and novel metabolites. however, a major obstacle to the development of algae as an industrial platform has been the poor expression of heterologous genes from the nuclear genome. here we describe a nuclear expression strategy using the foot-and-mouth-disease-virus 2a self-cleavage peptide to transcriptionally fuse heterologous gene expression to antibiotic resistance in chlamydomon ...201222937037
interplay of foot-and-mouth disease virus, antibodies and plasmacytoid dendritic cells: virus opsonization under non-neutralizing conditions results in enhanced interferon-alpha responses.foot-and-mouth disease virus (fmdv) is a highly infectious member of the picornaviridae inducing an acute disease of cloven-hoofed species. vaccine-induced immune protection correlates with the presence of high levels of neutralizing antibodies but also opsonising antibodies have been proposed as an important mechanism of the immune response contributing to virus clearance by macrophages and leading to the production of type-i interferon (ifn) by plasmacytoid dendritic cells (pdc). the present s ...201222934974
foot-and-mouth disease virus nonstructural protein 2c interacts with beclin1, modulating virus replication.foot-and-mouth disease virus (fmdv), the causative agent of foot-and-mouth disease, is an apthovirus within the picornaviridae family. replication of the virus occurs in association with replication complexes that are formed by host cell membrane rearrangements. the largest viral protein in the replication complex, 2c, is thought to have multiple roles during virus replication. however, studies examining the function of fmdv 2c have been rather limited. to better understand the role of 2c in the ...201222933281
novel antiviral therapeutics to control foot-and-mouth disease.foot-and-mouth disease virus (fmdv) causes a highly contagious disease of cloven-hoofed animals. vaccines require ∼7 days to induce protection; thus, before this time, vaccinated animals are still susceptible to the disease. our group has previously shown that swine inoculated with 1×10(11) focus forming units (ffu) of a replication-defective human adenovirus containing the gene for porcine interferon alpha (adt-pifn-α) are sterilely protected from fmdv serotypes a24, o1 manisa, or asia 1 when t ...201222924938
a safe foot-and-mouth disease vaccine platform with two negative markers for differentiating infected from vaccinated animals.vaccination of domestic animals with chemically inactivated foot-and-mouth disease virus (fmdv) is widely practiced to control fmd. currently, fmd vaccine manufacturing requires the growth of large volumes of virulent fmdv in biocontainment-level facilities. here, two marker fmdv vaccine candidates (a(24)ll3d(yr) and a(24)ll3b(pvkv)3d(yr)) featuring the deletion of the leader coding region (l(pro)) and one of the 3b proteins were constructed and evaluated. these vaccine candidates also contain e ...201222915802
identification of short hairpin rna targeting foot-and-mouth disease virus with transgenic bovine fetal epithelium cells.although it is known that rna interference (rnai) targeting viral genes protects experimental animals, such as mice, from the challenge of foot-and-mouth disease virus (fmdv), it has not been previously investigated whether shrnas targeting fmdv in transgenic dairy cattle or primary transgenic bovine epithelium cells will confer resistance against fmdv challenge.201222905125
human adenovirus-vectored foot-and-mouth disease vaccines: establishment of a vaccine product profile through in vitro testing.next generation, foot-and-mouth disease (fmd) molecular vaccines based on replication deficient human adenovirus serotype 5 viral vectored delivery of fmd capsid genes (adfmd) are being developed by the united states dept. of homeland security and industry partners. the strategic goal of this program is to develop adfmd licensed vaccines for the usa national veterinary stockpile for use, if needed, as emergency response tools during an fmd outbreak. this vaccine platform provides a unique opport ...201222888605
a critical role of n-myc and stat interactor (nmi) in foot-and-mouth disease virus (fmdv) 2c-induced apoptosis.foot-and-mouth disease virus (fmdv) 2c, is one of the most highly-conserved viral proteins among the serotypes of fmdv. however, its effect on host cells is not very clear. using yeast two-hybrid system and immunoprecipitation approaches, we found that fmdv 2c interacted with the n-myc and stat interactor (nmi) protein. when expressed in cells, fmdv 2c is mainly associated with endoplasmic reticulum in the forms of speckles. in the absence of fmdv 2c, nmi was distributed diffusely in the cytopla ...201222974759
effects of amino acid substitutions in the vp2 b-c loop on antigenicity and pathogenicity of serotype asia1 foot-and-mouth disease virus.foot-and-mouth disease virus (fmdv) exhibits a high degree of antigenic variability. studies of the antigenic diversity and determination of amino acid changes involved in this diversity are important to the design of broadly protective new vaccines. although extensive studies have been carried out to explore the molecular basis of the antigenic variation of serotype o and serotype a fmdv, there are few reports on asia1 serotype fmdv.201222963009
recombinant viral protein vp1 suppresses her-2 expression and migration/metastasis of breast cancer.breast cancer is one of the most common cancers in women worldwide and metastasis is the major cause of breast cancer death. development of new therapeutic agents for inhibiting breast cancer metastasis is therefore an urgent need. we previously demonstrated that recombinant dna-derived viral capsid protein vp1 (rvp1) of foot-and-mouth disease virus-induced apoptosis of mcf-7 breast cancer cells in vitro. here, we investigated whether rvp1 exhibits any inhibitory effects on migration/metastasis ...201222983836
comparison of immune responses against fmd by a dna vaccine encoding the fmdv/o/irn/2007 vp1 gene and the conventional inactivated vaccine in an animal model.foot-and-mouth disease virus (fmdv) is highly contagious and responsible for huge outbreaks among cloven hoofed animals. the aim of the present study is to evaluate a plasmid dna immunization system that expresses the fmdv/o/irn/2007 vp1 gene and compare it with the conventional inactivated vaccine in an animal model. the vp1 gene was sub-cloned into the unique kpn i and bamh i cloning sites of the pcdna3.1+ and pegfp-n1 vectors to construct the vp(1) gene cassettes. the transfected bhkt7 cells ...201223001482
enhanced inhibition of foot-and-mouth disease virus by combinations of porcine interferon-α and antiviral agents.foot-and-mouth disease (fmd) is an economically significant animal disease because of the speed of its transmission. the current fmd vaccine provides no protection until 7days after the vaccination, which reduces its effectiveness in the case of an outbreak. therefore, to find an alternative method of applying antiviral agents for rapid and enhanced inhibition of the fmd virus (fmdv), we compared the antiviral effects of promising antiviral agents and attempted to apply them in combination. firs ...201223000495
avidity and subtyping of specific antibodies applied to the indirect assessment of heterologous protection against foot-and-mouth disease virus in cattle.serological assessment of the heterologous response among foot-and-mouth disease virus (fmdv) strains is mainly performed by virus neutralization test (vnt), liquid phase blocking elisa and complement fixation assay. in this study two high-throughput elisa techniques, avidity and igg subtype elisa, were developed and used to further characterize heterologous antibody responses in cattle during vaccination and challenge. both assays were applied to a set of previously characterized sera from anim ...201223000129
genome sequences of sat 2 foot-and-mouth disease viruses from egypt and palestinian autonomous territories (gaza strip).two foot-and-mouth disease virus (fmdv) genome sequences have been determined for isolates collected from recent field outbreaks in north africa (egypt) and the middle east (palestinian autonomous territories). these data represent the first examples of complete genomic sequences for the fmdv sat 2 topotype vii, which is thought to be endemic in countries immediately to the south of the sahara desert. further studies are now urgently required to provide insights into the epidemiological links be ...201222843860
characteristics of serology-based vaccine potency models for foot-and-mouth disease virus.foot-and-mouth disease (fmd) vaccine potency testing involves hundreds of animals each year. despite considerable efforts during the past decades, a challenge-free alternative vaccine potency test to replace the european protective dose 50% test (pd(50)) has not been implemented yet. the aim of the present study was to further characterize the properties of serological vaccine potency models.201222824343
characterization of epitope-tagged foot-and-mouth disease virus.foot-and-mouth disease (fmd) is a highly contagious and economically devastating disease of cloven-hoofed animals with an almost-worldwide distribution. conventional fmd vaccines consisting of chemically inactivated viruses have aided in the eradication of fmd from europe and remain the main tool for control in endemic countries. although significant steps have been made to improve the quality of vaccines, such as improved methods of antigen concentration and purification, manufacturing processe ...201222815275
synergistic effects of 2a-mediated polyproteins on the production of lignocellulose degradation enzymes in tobacco plants.cost-effective bioethanol production requires a supply of various low-cost enzymes that can hydrolyse lignocellulosic materials consisting of multiple polymers. because plant-based enzyme expression systems offer low-cost and large-scale production, this study simultaneously expressed β-glucosidase (bglb), xylanase (xylii), exoglucanase (e3), and endoglucanase (cel5a) in tobacco plants, which were individually fused with chloroplast-targeting transit peptides and linked via the 2a self-cleaving ...201222798663
double candida antarctica lipase b co-display on pichia pastoris cell surface based on a self-processing foot-and-mouth disease virus 2a peptide.to develop a high efficiency candida antarctica lipase b (calb) yeast display system, we linked two calb genes fused with sacchromyces cerevisiae cell wall protein genes, the sed1 and the 3'-terminal half of sag1, separately by a 2a peptide of foot-and-mouth disease virus (fmdv) in a single open reading frame. the calb copy number of recombinant strain kcse2acsa that harbored the orf was identified, and the quantity of calb displayed on the cell surface and the enzyme activity of the strain were ...201222797600
improved neutralising antibody response against foot-and-mouth-disease virus in mice inoculated with a multi-epitope peptide vaccine using polyinosinic and poly-cytidylic acid as an adjuvant.a peptide-based vaccine for foot-and-mouth disease (fmd) was designed. the peptide immunogen had a g-h loop domain optimised for immunogenicity and broad-spectrum antigenicity to different lineages of serotype-o fmd viruses (fmdvs). polyinosinic and poly-cytidylic acid [poly (i:c)] was used as the adjuvant to overcome the low humoral antibody levels often observed in association with peptide-based vaccines. the multi-epitope peptide alone induced the secretion of a certain level of neutralising ...201222766183
mutagenesis-mediated decrease of pathogenicity as a feature of the mutant spectrum of a viral population.rna virus populations are heterogeneous ensembles of closely related genomes termed quasispecies. this highly complex distribution of variants confers important properties to rna viruses and influences their pathogenic behavior. it has been hypothesized that increased mutagenesis of viral populations, by treatment with mutagenic agents, can induce alterations in the pathogenic potential of a virus population. in this work we investigate whether mutagenized foot-and-mouth disease virus (fmdv) pop ...201222761933
connecting network properties of rapidly disseminating epizoonotics.to effectively control the geographical dissemination of infectious diseases, their properties need to be determined. to test that rapid microbial dispersal requires not only susceptible hosts but also a pre-existing, connecting network, we explored constructs meant to reveal the network properties associated with disease spread, which included the road structure.201222761900
increased plasma cardiac troponin i concentration in lambs with myocarditis.cardiac troponin i (ctni) is a blood biomarker of myocardial injury. a human ctni assay may be useful for measuring ctni concentrations in lambs with naturally occurring myocarditis.201222747688
bola-drb3 gene polymorphism and fmd resistance or susceptibility in wanbei cattle.for the further characterization of foot-and-mouth disease virus (fmdv)-induced foot-and-mouth disease, we investigated the association between polymorphism of bola-drb3 gene and fmd resistance/susceptibility of wanbei cattle challenged with fmdv. one hundred cattle were challenged with fmdv and exon 2 of bola-drb3 genes was amplified by hemi-nested polymerase chain reaction from asymptomatic animals and from animals with fmd. pcr products were characterized by the rflp technique using restricti ...201222744423
foot-and-mouth disease virus 3c protease cleaves nemo to impair innate immune signaling.foot-and-mouth disease is a highly contagious viral illness of wild and domestic cloven-hoofed animals. the causative agent, foot-and-mouth disease virus (fmdv), replicates rapidly, efficiently disseminating within the infected host and being passed on to susceptible animals via direct contact or the aerosol route. to survive in the host, fmdv has evolved to block the host interferon (ifn) response. previously, we and others demonstrated that the leader proteinase (l(pro)) of fmdv is an ifn anta ...201222718831
field outbreak strains of serotype o foot-and-mouth disease virus from india with a deletion in the immunodominant βg-βh loop of the vp1 protein.foot-and-mouth disease virus serotype o accounts for around 80 % of the outbreaks in india. although indian serotype o isolates belongs to the me-sa topotype, circulation of different lineages has been noted. after its emergence in the year 2001, the 'ind2001' lineage outcompeted the panasia lineage in causing serotype o outbreaks in the year 2009. three isolates had an amino acid deletion at position 139 in the vp1 coding region and grouped with the 'ind2001' lineage. the currently used indian ...201222707045
sindbis virus replicase-based dna vaccine construct encoding fmdv-specific multivalent epitope gene: studies on its immune responses in guinea pigs.foot-and-mouth disease (fmd) is still a perennial global menace affecting livestock health and production. it is imperative to figure out new ways to curb this disease. in this study, a sindbis virus replicase-based dna vaccine, psincmv-vac-meg990, encoding a multivalent epitope gene (representing tandemly linked vp1 c-terminal halves of three foot-and-mouth disease virus (fmdv) serotypes) was constructed. in vitro transfection studies in bhk-21 cells revealed that the construct was able to expr ...201222702835
mapping of antigenic determinants on a sat2 foot-and-mouth disease virus using chicken single-chain antibody fragments.recombinant single-chain variable fragments (scfvs) of antibodies make it possible to localize antigenic and immunogenic determinants, identify protective epitopes and can be exploited for the design of improved diagnostic tests and vaccines. a neutralizing epitope, as well as other potential antigenic sites of a sat2 foot-and-mouth disease virus (fmdv) were identified using phage-displayed scfvs. three unique zim/7/83-specific scfvs, designated scfv1, scfv2 and scfv3, were isolated. further cha ...201222698877
modelling the within-host dynamics of the foot-and-mouth disease virus in cattle.in this paper we investigate the within-host dynamics of the foot-and-mouth disease virus (fmdv) in cattle using previously published data for 8 experimentally infected cows. an 8-compartment, 14-parameter differential equation model was fitted to data collected from each cow every 24 h over the course of an infection on: (i) the concentration of fmdv genomes in the blood, (ii) the concentration of infectious virus in the blood, (iii) antibody levels, and (iv) interferon levels. model parameters ...201222664068
modulation of foot-and-mouth disease virus ph threshold for uncoating correlates with differential sensitivity to inhibition of cellular rab gtpases and decreases infectivity in vivo.the role of cellular rab gtpases that govern traffic between different endosome populations was analysed on foot-and-mouth disease virus (fmdv) infection. changes of viral receptor specificity did not alter rab5 requirement for infection. however, a correlation between uncoating ph and requirement of rab5 for infection was observed. a mutant fmdv with less acidic uncoating ph threshold was less sensitive to inhibition of rab5, whereas another mutant with more acidic requirements was more sensiti ...201222875255
expression and stability of foreign epitopes introduced into 3a nonstructural protein of foot-and-mouth disease virus.foot-and-mouth disease virus (fmdv) is an aphthovirus that belongs to the picornaviridae family and causes one of the most important animal diseases worldwide. the capacity of other picornaviruses to express foreign antigens has been extensively reported, however, little is known about fmdv. to explore the potential of fmdv as a viral vector, an 11-amino-acid (aa) hsv epitope and an 8 aa flag epitope were introduced into the c-terminal different regions of 3a protein of fmdv full-length infectio ...201222848509
a bayesian inference framework to reconstruct transmission trees using epidemiological and genetic data.the accurate identification of the route of transmission taken by an infectious agent through a host population is critical to understanding its epidemiology and informing measures for its control. however, reconstruction of transmission routes during an epidemic is often an underdetermined problem: data about the location and timings of infections can be incomplete, inaccurate, and compatible with a large number of different transmission scenarios. for fast-evolving pathogens like rna viruses, ...201223166481
sequence analysis of capsid coding region of foot-and-mouth disease virus type a vaccine strain during serial passages in bhk-21 adherent and suspension cells.sequence variability within the capsid coding region of the foot-and-mouth disease virus type a vaccine strain during serial in vitro passage was investigated. specifically, two methods of virus propagation were utilized, a monolayer and suspension culture of bhk-21 cells. at three positions (vp2(131) e-k in both monolayer and suspension passages, vp3(85) h-r in late monolayer passages and vp3(139) k-e in only suspension passages), all mapped to surface exposed loops, amino acid substitutions we ...201223084588
spatial trend of foot and mouth disease virus (fmdv) serotypes in cattle and buffaloes, pakistan.the present study describes the frequency of foot and mouth disease (fmd) virus serotypes (o, a and asia-1) in major regions (all provinces) of pakistan using indirect sandwich elisa. also, spatial distribution of various fmd serotypes and their comparison is discussed. a total of 590 samples (epithelial tissue) have been analyzed during a period of five years (2005-2009). out of 590 samples, 180 were found positive, giving an overall confirmation of fmdv about 33.2 %. of the prevalent serotypes ...201223055008
generation of monoclonal antibodies against non-structural protein 3ab of foot-and-mouth disease virus.to identify linear epitopes on the non-structural protein 3ab of foot-and-mouth disease virus (fmdv), babl/c mice were immunized with the 3ab protein and splenocytes of balb/c mice were fused with myeloma sp2/0 cells. two hybridoma monoclonal antibodies (mabs) cell lines against the 3ab protein of foot-and-mouth disease virus (fmdv) were obtained, named c6 and e7 respectively. the microneutralization titer was 1:1024 for mab c6, and 1:512 for e7. both mabs contain kappa light chains, and were of ...201223055007
use of the foot-and-mouth disease virus 2a peptide co-expression system to study intracellular protein trafficking in arabidopsis.a tool for stoichiometric co-expression of effector and target proteins to study intracellular protein trafficking processes has been provided by the so called 2a peptide technology. in this system, the 16-20 amino acid 2a peptide from rna viruses allows synthesis of multiple gene products from single transcripts. however, so far the use of the 2a technology in plant systems has been limited.201223251667
plasma membrane phosphatidylinositol 4,5 bisphosphate is required for internalization of foot-and-mouth disease virus and vesicular stomatitis virus.phosphatidylinositol-4,5-bisphosphate, pi(4,5)p(2), is a phospholipid which plays important roles in clathrin-mediated endocytosis. to investigate the possible role of this lipid on viral entry, two viruses important for animal health were selected: the enveloped vesicular stomatitis virus (vsv) - which uses a well characterized clathrin mediated endocytic route - and two different variants of the non-enveloped foot-and-mouth disease virus (fmdv) with distinct receptor specificities. the express ...201223028825
interferon-γ induced by in vitro re-stimulation of cd4+ t-cells correlates with in vivo fmd vaccine induced protection of cattle against disease and persistent infection.the immune defense against fmdv has been correlated to the antibody mediated component. however, there are occasions when some animals with high virus neutralising (vn) antibody are not protected following challenge and some with low neutralising antibody which do not succumb to disease. the importance of cell mediated immunity in clinical protection is less clear and so we investigated the source and production of interferon-gamma (ifn-γ) in re-stimulated whole blood of fmdv immunized cattle an ...201223028529
emergence of foot-and-mouth disease virus sat 2 in egypt during 2012.the epidemiology of foot-and-mouth disease (fmd) in north africa is complicated by the co-circulation of endemic fmd viruses (fmdv), as well as sporadic incursions of exotic viral strains from the middle east and sub-saharan africa. this report describes the molecular characterization of sat 2 fmd viruses that have caused widespread field outbreaks of fmd in egypt during february and march 2012. phylogenetic analysis showed that viruses from these outbreaks fell into two distinct lineages within ...201223025522
humanization and characterization of an anti-ricin neutralization monoclonal antibody.ricin is regarded as a high terrorist risk for the public due to its high toxicity and ease of production. currently, there is no therapeutic or vaccine available against ricin. d9, a murine monoclonal antibody developed previously in our laboratory, can strongly neutralize ricin and is therefore a good candidate for humanization. humanization of d9 variable regions was achieved by a complementarity-determining region grafting approach. the humanized d9 (hd9) variable regions were further grafte ...201223049820
development of foot-and-mouth disease virus (fmdv) serotype o virus-like-particles (vlps) vaccine and evaluation of its potency.foot-and-mouth disease (fmd) is an economically significant viral disease that rampage dairy and other livestock industries in many countries. the disease is being controlled by the use of an inactivated vaccine. however, a recombinant marker vaccine, which avoids the use of live virus, may be an option for the unambiguous differentiation of infected animals from vaccinated animals. a recombinant baculovirus clone containing p1-2a-3c coding sequences of foot-and-mouth disease virus (fmdv) seroty ...201223043941
sequential administration of cytokine genes to enhance cellular immune responses and cd4 (+) t memory cells during dna vaccination.antigen specific memory t cells (tm) have shown to be an important factor in protecting hosts against subsequent infection by previously encountered pathogens. during t-cell activation, several cytokines including il-6, il-7 and il-15, play crucial roles in the development of t cells into memory t cells. with the aim of generating specific tm, we examined a strategy of sequential administration of molecular adjuvants. in this strategy a dna vaccine encoding the vp1 capsid protein of foot and mou ...201223151452
southeast asian foot-and-mouth disease viruses in eastern asia.foot-and-mouth disease (fmd) outbreaks recently affected 2 countries (japan and south korea) in eastern asia that were free of fmd without vaccination. analysis of viral protein 1 nucleotide sequences indicated that fmd serotype a and o viruses that caused these outbreaks originated in mainland southeast asia to which these viruses are endemic.201222377196
characterization of a full-length infectious cdna clone and a gfp reporter derivative of the oncolytic picornavirus svv-001.seneca valley virus (svv-001) is an oncolytic picornavirus with selective tropism for a subset of human cancers with neuroendocrine differentiation. to characterize further the specificity of svv-001 and its patterns and kinetics of intratumoral spread, bacterial plasmids encoding a cdna clone of the full-length wild-type virus and a derivative virus expressing gfp were generated. the full-length cdna of the svv-001 rna genome was cloned into a bacterial plasmid under the control of the t7 core ...201222971818
[construction of a full-length infectious cdna clone of inter-genotypic chimeric foot-and-mouth disease virus].a series of type o foot-and-mouth disease (fmd) outbreaks occurred in china seriously affect development of chinese husbandry. its causative agent-type o foot-and-mouth disease virus (fmdv) has been evolved three topotypes: cathay, middle east-south asia and southeast asia, specifically, the viruses of cathay topotype are highly adapted to pig, representing the biggest threat on chinese pig industry. the available fmd vaccine in china provides insufficient protection against some arising viruses ...201222489468
mutagenesis-mediated virus extinction: virus-dependent effect of viral load on sensitivity to lethal defection.lethal mutagenesis is a transition towards virus extinction mediated by enhanced mutation rates during viral genome replication, and it is currently under investigation as a potential new antiviral strategy. viral load and virus fitness are known to influence virus extinction. here we examine the effect or the multiplicity of infection (moi) on progeny production of several rna viruses under enhanced mutagenesis.201222442668
promotion of viral internal ribosomal entry site-mediated translation under amino acid starvation.cap-dependent and internal ribosomal entry site (ires)-mediated translation are regulated differently within cells. viral ires-mediated translation often remains active when cellular cap-dependent translation is severely impaired under cellular stresses induced by virus infection. to investigate how cellular stresses influence the efficiency of viral ires-mediated translation, we used a bicistronic luciferase reporter construct harbouring ires elements from the following viruses: encephalomyocar ...201222302880
interaction of paramecium caudatum and picornaviruses.in our paper we have researched the relationship between picornaviruses (poliovirus, foot-and-mouth disease virus and encephalomyocarditis virus) and ciliata (paramecium caudatum). we show that the number of paramecium in medium sharply increased during coincubation with picornaviruses within 2-5 days. this cannot be explained only by the fact that viruses were nutrient source for paramecium because in case of inactivated viruses the number of infusorians in medium increased a little. at the sam ...201224293830
[construction and functional characterization of a monocistronic replicon based on the hcv genotype 2a promotor].to construct a hepatitis c virus (hcv) genotype 2a monocistronic replicon and investigate its replication capabilities in the human hepatocarcinoma cell lines, huh7.5 and huh7.1, in order to determine its potential as a molecular tool for future in vitro studies of hcv replication and selection studies for putative anti-hcv drugs. site-directed mutagenesis was used to delete the core-e1-e2-p7-ns2 fragment (about 3090 bp) from plasmid pj6jfh1blarl. the resultant trianglepj6jfh1blarl plasmid was d ...201222464780
coordinate lentiviral expression of cre recombinase and rfp/egfp mediated by fmdv 2a and analysis of cre activity.the site-specific recombination mediated by cre recombinase has been utilized extensively in genetic engineering and gene function studies. efficient delivery of a cre enzyme with enzymatic activity and the ability to monitor the enzyme expression are required in applications, and lentiviral constructs with a fluorescent protein (fp) to report the cre expression are suitable for most studies. however, the current lentiviral vector systems have some deficiencies in precise reporting the cre expre ...201222532014
detection of foot-and-mouth disease serotype o by elisa using a monoclonal antibody.an elisa assay with monoclonal antibody (melisa) was used to type serotype o of foot-and-mouth disease virus (fmdv). all fmdv serotype o reference strains were positive by melisa, while other viruses such as fmdv serotypes asia 1, c, a and classical swine fever virus, swine vesicular disease virus, and porcine reproductive and respiratory syndrome virus remained negative. further, fmdv serotype o positive samples were able to be detected by melisa. this assay may be particularly suitable for dia ...201223244327
a dna vaccine encoding the fmdv capsid precursor polypeptide p1 and the enhancing effect of bovine herpesvirus 1 vp22 protein as molecular adjuvant.dna vaccines containing the capsid precursor polypeptide p1 gene of foot-and-mouth disease virus (fmdv) alone or combined with the vp22 gene of bovine herpesvirus 1 (bvp22) as molecular adjuvant were constructed and used for immunization of balb/c mice. the latter were challenged with fmdv and their humoral as well as cell-mediated immune responses and virus clearance capacity were assayed. both dna vaccines elicited specific immune responses, however, the dna vaccine with the bvp22 adjuvant sho ...201222720700
Refresh
firstprev
12345678910...
nextlast
Displaying items 801 - 900 of 4462