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2018 ; 9
(ä): 1327
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Endoplasmic Reticulum Stress Mediated MDRV p10 8 Protein-Induced Cell Cycle
Arrest and Apoptosis Through the PERK/eIF2? Pathway
#MMPMID29977231
Wang Q
; Yuan X
; Chen Y
; Zheng Q
; Xu L
; Wu Y
Front Microbiol
2018[]; 9
(ä): 1327
PMID29977231
show ga
In this study, the mechanism of Muscovy duck reovirus (MDRV) p10.8
protein-induced pathogenesis was investigated, with a focus on endoplasmic
reticulum (ER) stress. In chicken embryo fibroblasts cell lines (DF1),
pCI-neo-flg-p10.8 protein transfection increased the phosphorylation (p-) levels
of PERK and eIF2? as shown by Western blotting analysis and led to the
dissociation of BiP from PERK as shown by co-immunoprecipitation (Co-IP)
analysis. Results of treatment with both ER stress activator and inhibitor
further confirmed that p10.8 protein induced ER stress. Subsequently, using flow
cytometry analysis, it was also found that p10.8 protein induced cell cycle
arrest during the G0/G1 phase. Furthermore, p10.8 transfection increased the
phosphorylation levels of PERK and eIF2?, and reduced the expression levels of
CDK2, CDK4, and Cyclin E according to Western blotting analysis. Treatment with
ER stress activator and ER stress inhibitor after p10.8 protein transfection in
DF1 cells further indicated that p10.8 protein induced ER stress, which resulted
in cell cycle arrest. The results of knockdown of either PERK or eIF2? genes
further confirmed that p10.8 protein-induced ER stress led to cell cycle arrest
through the PERK/eIF2? pathway. Further results showed that p10.8 protein induced
ER stress and apoptosis in DF1 cells. The expression levels of p-PERK, p-eIF2?,
CHOP, cleaved-Caspase12, and cleaved-Caspase3 were increased by p10.8 protein.
Test results of treatment with each of Tunicamycin, TUDCA and knockdown of PERK,
and eIF2?, confirmed that p10.8 protein induced ER stress involving apoptosis via
the PERK/eIF2? pathway. In conclusion, MDRV p10.8 protein induced ER stress that
caused cell cycle arrest and apoptosis through the PERK/eIF2? pathway.