Результаты поиска

Analysis of poliovirus protein 3A interactions with viral and cellular proteins in infected cells.

Poliovirus proteins 3A and 3AB are small, membrane-binding proteins that play multiple roles in viral RNA replication complex formation and function. In the infected cell, these proteins associate with other viral and cellular proteins as part of a supramolecular complex whose structure and composition are unknown. We isolated viable viruses with three different epitope tags (FLAG, hemagglutinin [HA], and c-myc) inserted into the N-terminal region of protein 3A. These viruses exhibited growth properties and characteristics very similar to those of the wild-type, untagged virus. Extracts prepar…

The TLR3/TICAM-1 pathway is mandatory for innate immune responses to poliovirus infection.

Cytoplasmic and endosomal RNA sensors recognize RNA virus infection and signals to protect host cells by inducing type I IFN. The cytoplasmic RNA sensors, retinoic acid inducible gene I/melanoma differentiation-associated gene 5, actually play pivotal roles in sensing virus replication. IFN-β promoter stimulator-1 (IPS-1) is their common adaptor for IFN-inducing signaling. Toll/IL-1R homology domain-containing adaptor molecule 1 (TICAM-1), also known as TRIF, is the adaptor for TLR3 that recognizes viral dsRNA in the early endosome in dendritic cells and macrophages. Poliovirus (PV) belongs to…

Древний позитивный отбор CD155 в качестве возможной причины уязвимости к полиомиелитвирусной инфекции у кимианцев.

Полиовирус является этиологическим агентом полиомиелита. Из наблюдений о том, что только кимианцы подвержены полиомиелитвирусной инфекции и что 37 участков аминокислоты (места, связанные с полиомиелитвирусом [ПБА]) в области D1 CD155 связаны с полиомиелитвирусом, считается, что подверженность полиомиелитвирусной инфекции возникла в результате замены аминокислоты на участках ПБА на родовой ветке кимианов. Здесь показано, что на этих заменителях положительное отбор производится путем анализа последовательностей нуклеотидов, кодирующих почти всю область D1 у людей, нечеловеческих гоминоидов (химп

Совпадение в аннотации оригинала
Poliovirus is the etiological agent of poliomyelitis. From the observations that only simians are susceptible to poliovirus infection and that 37 amino acid sites (the poliovirus-binding associated [PBA] sites) in the domain D1 of CD155 are involved in the binding to poliovirus, it is considered that the susceptibility to poliovirus infection evolved through…

[Characterization of poliovirus vaccine strains isolated in the country with high level of immunization coverage].

The frequency of vaccine poliovirus isolation from children aged under 3 years was studied in Belarus, a country with a high level of immunization against poliomyelitis. Antigenic and genetic characteristics of the isolated strains were studied. Vaccine poliovirus detection rate was high (11.8%). Polioviruses were isolated from children immunized recently (27.2%), immunized more than 2 months before (7.5%), and from non-immunized children (9.8%). An appreciable number (36.1%) of the isolated strains were antigenically and/or genetically modified derivatives of Sabin virus. Epidemiological data…

The poliovirus receptor CD155 mediates cell-to-matrix contacts by specifically binding to vitronectin.

The human receptor for poliovirus (CD155) is an immunoglobulin-like molecule with unknown normal function(s). Here we provide evidence that CD155 binds specifically to vitronectin with a dissociation constant (K(d)) of 72 nM as determined by surface plasmon resonance. Based on sequence homology to the CD155 gene, three poliovirus receptor-related genes (PRR1, PRR2, and PRR3) were cloned recently. PRR proteins were reported by others to mediate homophilic cell adhesion. Neither PRR1 nor PRR2 binds poliovirus and it is assumed that their physiological functions differ from that of CD155. Indeed,…

Changes in neuron size in cynomolgus macaques infected with various immunodeficiency viruses and poliovirus.

Human immunodeficiency virus (HIV) infection leads to clinically significant neuronal pathology, but the underlying mechanism remains unclear. Infection of rhesus macaques with the simian immunodeficiency virus SIVmac251 has been shown to cause atrophy of hippocampal pyramidal cells. The aim of the current investigation was to determine whether SIVmac251 and other viruses with differing abilities to cause immune suppression or encephalitis could cause neuronal atrophy in cynomolgus macaques. Animals infected with SIVmac251 (n = 22), HIV-2 (n = 6). SIVmac239 (n = 7) and poliovirus (n = 10) were…

Estimation of the neurovirulence of poliovirus by non-radioisotope molecular analysis to quantify genomic changes.

Mutant analysis by polymerase chain reaction and restriction enzyme cleavage (MAPREC) has been developed for poliovirus to determine quantitatively for the presence of genomic changes in particular nucleotide sequences correlate with the characteristic of neurovirulence for monkeys. Currently the MAPREC is scheduled to be used as a routine safety test for oral poliomyelitis vaccine (OPV). Radioisotopes (RI) are used in MAPREC for quantitative determinations, a circumstance likely to limit its use. We investigated the possibility of developing a modified MAPREC, which did not require the use of…

Molecular characterization of a wild poliovirus type 3 epidemic in The Netherlands (1992 and 1993).

An outbreak of poliomyelitis due to wild poliovirus type 3 (PV3) occurred in an unvaccinated community in The Netherlands between September 1992 and February 1993. The outbreak involved 71 patients. The aim of this study was to characterize the virus at the molecular level and to analyze the molecular evolution of the epidemic virus. Molecular analysis was carried out by sequencing the VP1/2A junction region (150 nucleotides) of 50 PV3 strains isolated in association with this outbreak and the entire VP1 gene of 14 strains. In addition, the sequence of the VP1/2A junction region of strains fro…

Some aspects of the monkey neurovirulence test used for the assessment of oral poliovirus vaccines.

Twelve years of experience in three control laboratories with 8,000 macaca monkeys for the testing of 204 monovalent lots of the three types of oral poliovirus vaccine (OPV), have shown that the new monkey neurovirulence test (MNVT) adopted by the World Health Organization (WHO) is a reproducible and sensitive assay likely to ensure the safety of this vaccine in humans. When the test vaccine and the appropriate homotypic reference vaccine were tested in a single group of monkeys, the concurrent use of the reference vaccine considerably increased the reproducibility of the test. The usefulness …

Characterization of poliovirus-specific T lymphocytes in the peripheral blood of Sabin-vaccinated humans.

Poliovirus-specific cellular immune responses were identified in the peripheral blood mononucleocytes of Sabin-immunized human donors by using a proliferation assay. Complement depletion and monoclonal antibody inhibition studies suggest that the effector population is the major histocompatibility complex (MHC) class II-restricted CD4+ T-helper cell. Immune lymphocytes proliferated to polyacrylamide gel purified-capsid proteins VP1, VP2, and VP3 and, in some individuals, to synthetic VP4, indicating the presence of T-cell epitopes in each of these proteins. Using synthetic peptides, T-cell epi…

Infectious cDNA, cell receptors and transgenic mice in the study of Sabin's poliovirus vaccines.

The determination of the nucleotide sequence of the poliovirus genome, the isolation of infectious poliovirus cDNAs, and the identification of the cell receptor for poliovirus and establishment of a transgenic mouse model for poliomyelitis have all contributed to our understanding of the live, attenuated Sabin poliovirus vaccines. These highly effective vaccines have been studied extensively by many laboratories to determine the molecular basis for their attenuation phenotype. For this special issue I would like to review how our research has improved the understanding of Sabin's poliovirus va…

Infection of HeLa cells with poliovirus results in modification of a complex that binds to the rRNA promoter.

In HeLa cells, RNA polymerase I (Pol I)-mediated transcription is severely inhibited soon after infection with poliovirus. We have developed a gel retardation assay to analyze DNA-protein complexes formed at the Pol I promoter. We show here that two complexes (A and C) formed by nuclear extracts from uninfected cells disappear after infection of cells with poliovirus. In contrast, a new, rapidly migrating complex (D) is formed in virus-infected cell extract. This change in the mobility of gel-retarded complexes correlates well with the kinetics of inhibition of rRNA transcription in virus-infe…

Genetic variation occurring on the genome of an in vitro insertion mutant of poliovirus type 1.

An insertion sequence of 72 nucleotides prepared from a polylinker sequence of plasmid pUC18 was introduced at nucleotide position 702 of the 5' noncoding sequence (742 nucleotides long) of the genome of the Sabin strain of poliovirus type 1 by using an infectious cDNA clone of the virus strain. The insertion mutant thus obtained showed a small-plaque phenotype compared with that of the parent virus. Apparent revertants (large-plaque variants) were easily generated from the insertion mutant. Nucleotide sequence analysis was performed on the revertant genomes to determine the mutation(s) by whi…

Physical and metabolic requirements for early interaction of poliovirus and human rhinovirus with HeLa cells.

Attachment, ""tight binding'' and eclipse of radioactive poliovirus 2 (P2) and human rhinovirus 2 (HRV 2) were investigated. The activation energy for attachment of both HRV2 and P2 was about 13 kcal/mol. HRV2 differed from P2 in two respects: the Arrhenius plot for attachment of HRV2 showed a break at 15 to 19 degrees C when the cells were first treated several hours at 0 degrees C, and attachment of HRV2 was inhibited by treatment of cells with metabolic poisons able to reduce cellular ATP by more than 90%. Tight binding was determined by isolation of a specific P2-membrane complex or by los…

Polyadenylic acid sequences in the virion RNA of poliovirus and Eastern Equine Encephalitis virus.

Poliovirus virion RNA contains a single covalently bound sequence of polyadenylic acid which is approximately 49 nucleotides long. A single, slightly longer polyadenylic acid sequence is contained in Eastern Equine Encephalitis virus RNA. Since these viruses are otherwise dissimilar these sequences may play a common role in viral replication, possibly in translation of the viral RNA.

Humoral and intestinal immunity induced by new schedules of bivalent oral poliovirus vaccine and one or two doses of inactivated poliovirus vaccine in Latin American infants: an open-label randomised controlled trial.

BACKGROUND: Replacement of the trivalent oral poliovirus vaccine (tOPV) with bivalent types 1 and 3 oral poliovirus vaccine (bOPV) and global introduction of inactivated poliovirus vaccine (IPV) are major steps in the polio endgame strategy. In this study, we assessed humoral and intestinal immunity in Latin American infants after three doses of bOPV combined with zero, one, or two doses of IPV. METHODS: This open-label randomised controlled multicentre trial was part of a larger study. 6-week-old full-term infants due for their first polio vaccinations, who were healthy on physical examinati…

Factors contributing to outbreaks of wild poliovirus type 1 infection involving persons aged ≥15 years in the Democratic Republic of the Congo, 2010-2011, informed by a pre-outbreak poliovirus immunity assessment.

BACKGROUND: The Democratic Republic of the Congo (DRC) experienced atypical outbreaks of wild poliovirus type 1 (WPV1) infection during 2010-2011 in that they affected persons aged ≥15 years in 4 (Bandundu, Bas Congo, Kasaï Occidental, and Kinshasa provinces) of the 6 provinces with outbreaks. METHODS: Analyses of cases of WPV1 infection with onset during 2010-2011 by province, age, polio vaccination status, and sex were conducted. The prevalence of antibodies to poliovirus (PV) types 1, 2, and 3 was assessed in sera collected before the outbreaks from women attending antenatal clinics in 3 o…

Increasing Population Immunity Prior to Globally-Coordinated Cessation of Bivalent Oral Poliovirus Vaccine (bOPV).

In 2022, global poliovirus modeling suggested that coordinated cessation of bivalent oral poliovirus vaccine (bOPV, containing Sabin-strain types 1 and 3) in 2027 would likely increase the risks of outbreaks and expected paralytic cases caused by circulating vaccine-derived polioviruses (cVDPVs), particularly type 1. The analysis did not include the implementation of planned, preventive supplemental immunization activities (pSIAs) with bOPV to achieve and maintain higher population immunity for types 1 and 3 prior to bOPV cessation. We reviewed prior published OPV cessation modeling studies to…