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2018 ; 8
(1
): 10889
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Immature particles and capsid-free viral RNA produced by Yellow fever
virus-infected cells stimulate plasmacytoid dendritic cells to secrete
interferons
#MMPMID30022130
Sinigaglia L
; Gracias S
; Décembre E
; Fritz M
; Bruni D
; Smith N
; Herbeuval JP
; Martin A
; Dreux M
; Tangy F
; Jouvenet N
Sci Rep
2018[Jul]; 8
(1
): 10889
PMID30022130
show ga
Plasmacytoid dendritic cells (pDCs) are specialized in the production of
interferons (IFNs) in response to viral infections. The Flaviviridae family
comprises enveloped RNA viruses such as Hepatitis C virus (HCV) and Dengue virus
(DENV). Cell-free flaviviridae virions poorly stimulate pDCs to produce IFN. By
contrast, cells infected with HCV and DENV potently stimulate pDCs via
short-range delivery of viral RNAs, which are either packaged within immature
virions or secreted exosomes. We report that cells infected with Yellow fever
virus (YFV), the prototypical flavivirus, stimulated pDCs to produce IFNs in a
TLR7- and cell contact- dependent manner. Such stimulation was unaffected by the
presence of YFV neutralizing antibodies. As reported for DENV, cells producing
immature YFV particles were more potent at stimulating pDCs than cells releasing
mature virions. Additionally, cells replicating a release-deficient YFV mutant or
a YFV subgenomic RNA lacking structural protein-coding sequences participated in
pDC stimulation. Thus, viral RNAs produced by YFV-infected cells reach pDCs via
at least two mechanisms: within immature particles and as capsid-free RNAs. Our
work highlights the ability of pDCs to respond to a variety of viral RNA-laden
carriers generated from infected cells.