Search results for "Echovirus 1"
showing 10 items of 13 documents
A Novel Open and Infectious Form of Echovirus 1.
2016
ABSTRACT One of the hallmarks of enterovirus genome delivery is the formation of an uncoating intermediate particle. Based on previous studies of mostly heated picornavirus particles, intermediate particles were shown to have externalized the innermost capsid protein (VP4) and exposed the N terminus of VP1 and to have reduced infectivity. Here, in addition to the native and intact particle type, we have identified another type of infectious echovirus 1 (E1) particle population during infection. Our results show that E1 is slightly altered during entry, which leads to the broadening of the major virion peak in the sucrose gradient. In contrast, CsCl gradient separation revealed that in addit…
Novel activities of safe-in-human broad-spectrum antiviral agents
2018
According to the WHO, there is an urgent need for better control of viral diseases. Re-positioning existing safe-in-human antiviral agents from one viral disease to another could play a pivotal role in this process. Here, we reviewed all approved, investigational and experimental antiviral agents, which are safe in man, and identified 59 compounds that target at least three viral diseases. We tested 55 of these compounds against eight different RNA and DNA viruses. We found novel activities for dalbavancin against echovirus 1, ezetimibe against human immunodeficiency virus 1 and Zika virus, as well as azacitidine, cyclosporine, minocycline, oritavancin and ritonavir against Rift valley feve…
Entry of Human Parechovirus 1
2001
ABSTRACT Human parechovirus 1 (HPEV-1) is a prototype member of parechoviruses, a recently established picornavirus genus. Although there is preliminary evidence that HPEV-1 recognizes α V integrins as cellular receptors, our understanding of early events during HPEV-1 infection is still very limited. The aim of this study was to clarify the entry mechanisms of HPEV-1, including the attachment of the virus onto the host cell surface and subsequent internalization. In blocking experiments with monoclonal antibodies against different receptor candidates, antibodies against α V and β 3 integrin subunits, in particular in combination, appeared to be the most efficient ones in preventing the HPE…
Echovirus 1 infektion vaikutus epidermaalisen kasvutekijäreseptorin endosytoosiin ja signalointiin
2013
Epidermaalinen kasvutekijäreseptori (EGFR) on yhdessä kollageeni- ja lamiinireseptori α2β1-integriinin kanssa tärkeä tekijä solun selviytymisen, kiinnittymisen ja jakautumisen säätelemisessä sekä syöpäsoluissa. Kasvutekijän sitoutumisen jälkeen EGFR:t dimerisoituvat, endosytoituvat klatriinivälitteisen endosytoosin kautta ja kulkeutuvat solun sisällä kolmen eri reitin mukaisesti: 1) EGFR-ligandi-kompleksi voi ubikitinaation seurauksena päätyä lysosomaaliseen pH:sta riippuvaan hajoitukseen, EGFR kierrättyy takaisin solukalvolle 2) ligandin irtoamisen tai 3) UBPY de-ubikitinaatioenstyymin toimesta. α2β1-integriinireseptori klusteroituu solukalvolle kiinnityttyään kollageeniin, lamiiniin, Echo…
Enterovirus-induced non-acidic entry pathway and its relation to the epidermal growth factor receptor pathway
2014
ESCRT-kompleksien merkitys echovirus 1 -infektiossa ja kaveosomin monivesikkelisen rakenteen muodostumisessa
2008
Endosomin sisäisen ioniympäristön vaikutukset echovirus 1 -infektioon
2009
Cholesterol Dependence of Collagen and Echovirus 1 Trafficking along the Novel alpha2beta1 Integrin Internalization Pathway
2013
We have previously shown that soluble collagen and a human pathogen, echovirus 1 (EV1) cluster α2β1 integrin on the plasma membrane and cause their internalization into cytoplasmic endosomes. Here we show that cholesterol plays a major role not only in the uptake of α2β1 integrin and its ligands but also in the formation of α2 integrin-specific multivesicular bodies (α2-MVBs) and virus infection. EV1 infection and α2β1 integrin internalization were totally halted by low amounts of the cholesterol-aggregating drugs filipin or nystatin. Inhibition of cholesterol synthesis and accumulation of lanosterol after ketoconazole treatment inhibited uptake of collagen, virus and clustered integrin, an…
Integrin-mediated entry of echovirus 1
2008
Paula Upla selvitti väitöskirjassaan echovirus 1:n solunsisäistä reittiä ja tunnisti solurakenteita ja säätelijöitä, jotka ovat tärkeitä infektiossa. Echovirus 1 (EV1) kuuluu pikornavirusperheeseen, jonka muita tunnettuja edustajia ovat poliovirus sekä karjan suu- ja sorkkatautivirus. EV1 on pieni (25-30 nm), vaipaton RNA-virus. EV1 aiheuttaa useimmiten oireettomia tai vähäoireisia suolisto- ja hengitystieinfektioita, mutta myös vakavampia tiloja, kuten aivokalvontulehdusta.Upla seurasi viruksen tunkeutumista soluun käyttäen elektronimikroskopiaa sekä tehokasta kolmi- ja neliulotteista konfokaalimikroskopiaa. Näin hän pystyi havainnoimaan yhtä aikaa usean eri molekyylin vuorovaikutusta niih…