1887

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Volume 85, Issue 7

IL8 release, tight junction and cytoskeleton dynamic reorganization conducive to permeability increase are induced by dengue virus infection of microvascular endothelial monolayers Free

Abstract

Permeability alterations of microvascular endothelia may be a factor in the plasma leakage produced by dengue virus infection. Confluent monolayers of the human dermal microvascular endothelial cell line HMEC-1 were utilized as an experimental model to study the cellular responses induced by the virus. Infected monolayers showed increased permeability for [H]mannitol, but no changes were observed for 4–70 kDa dextrans at 48 h post-infection (p.i.), a time at which viral titres reached maximal values and 40 % of the cells expressed viral proteins. A further increase in permeability occurred at 72 h, still without evident cytopathic effects on the monolayer. Coinciding with this, actin was reorganized in the infected cells and the tight junction protein occludin was displaced to the cytoplasm. Increments in the thickness of stress fibres and focal adhesions were observed in uninfected cells neighbouring infected cells. Culture medium from infected monolayers induced permeability changes and thickening of actin-containing structures in control cultures that resembled those observed 48 h p.i. Interleukin (IL) 8 was found in culture medium at concentrations ranging from 20 to 100 pg ml. Neutralizing antibodies against IL8 partially inhibited the changes produced by the culture medium as well as those induced by addition of IL8. Genistein inhibited the effect of the culture medium and the phosphorylation of proteins associated with focal adhesions and indicated the participation of tyrosine kinases. These findings suggest that IL8 production by infected monolayers contributes to the virus-induced effect on the cytoskeleton and tight junctions and thereby modifies transendothelial permeability.

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2004-07-01
2024-04-20
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IL8 release, tight junction and cytoskeleton dynamic reorganization conducive to permeability increase are induced by dengue virus infection of microvascular endothelial monolayers
J. Gen. Virol. 85, 1801 (2004); https://doi.org/10.1099/vir.0.19652-0
/content/journal/jgv/10.1099/vir.0.19652-0
/content/journal/jgv/10.1099/vir.0.19652-0
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