Semliki forest virus-induced endoplasmic reticulum stress accelerates apoptotic death of mammalian cells.
J Virol
; 84(14): 7369-77, 2010 Jul.
Article
in En
| MEDLINE
| ID: mdl-20427528
ABSTRACT
The alphavirus Semliki Forest virus (SFV) and its derived vectors induce apoptosis in mammalian cells. Here, we show that apoptosis is associated with the loss of mitochondrial membrane potential followed by the activation of caspase-3, caspase-8, and caspase-9. Cell death can be partially suppressed by treatment with the pan-caspase inhibitor zVAD-fmk. To determine the role of SFV structural proteins in cell death, the temporal course of cell death was compared in cells infected with SFV and cells infected with SFV virus replicon particles (VRPs) lacking some or all of the virus structural genes. In the absence of virus structural proteins, cell death was delayed. The endoplasmic reticulum (ER) stress response, as determined by the splicing of X-box binding protein 1 (XBP1) transcripts and the activation of caspase-12, was activated in virus-infected cells but not in VRP (SFV lacking structural genes)-infected cells. The C/EBP-homologous protein (CHOP) was upregulated by both virus and VRP infections. The virus envelope proteins but not the virus capsid protein triggered ER stress. These results demonstrate that in NIH 3T3 cells, SFV envelope glycoproteins trigger the unfolded protein response of the ER and accelerate apoptotic cell death initiated by virus replicase activity.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Semliki forest virus
/
Stress, Physiological
/
Apoptosis
/
Endoplasmic Reticulum
Limits:
Animals
Language:
En
Journal:
J Virol
Year:
2010
Document type:
Article
Affiliation country:
Reino Unido