Proteomics Profiling of Host Cell Response via Protein Expression and Phosphorylation upon Dengue Virus Infection

Dengue virus(DENV)infection is a worldwide public health threat.To date,the knowledge about the pathogenesis and progression of DENV infection is still limited.Combining global profiling based on proteomic analysis together with functional verification analysis is a powerful strategy to investigate the interplay between the virus and host cells.In the present study,quantitative proteomics has been applied to evaluate host responses(as indicated by altered proteins and modifications)in human cells(using K562 cell line)upon DENV-2 infection,as DENV-2 spreads most widely among all DENV serotypes.Comparative analysis was performed to define differentially expressed proteins in the infected cells compared to the mock-control,and it revealed critical pathogen-induced changes covering a broad spectrum of host cellular compartments and processes.We also discovered more dramatic changes(>20%,160 regulated phosphoproteins)in protein phosphorylation compared to protein expression(14%,321 regulated proteins).Most of these proteins/phosphoproteins were involved in transcription regulation,RNA splicing and processing,immune system,cellular response to stimulus,and macromolecule biosynthesis.Western blot analysis was also performed to confirm the proteomic data.Potential roles of these altered proteins were discussed.The present study provides valuable large-scale protein-related information for elucidating the functional emphasis of host cell proteins and their post-translational modifications in virus infection,and also provides insight and protein evidence for understanding the general pathogenesis and pathology of DENV.

Enterovirus 713C proteolytically processes the histone H3 N-terminal tail during infection

Dear Editor,Enterovirus 71(EV71)belongs to the genus Enterovirus,family Picornaviridae(Oberste et al.,1999).It was first isolated from patients with central nervous system diseases in California between 1969 and1974(Schmidt et al.,1974)and has spread worldwide(Solomon et al.,2010).EV71 infection usually causes mild,self-limiting hand,foot,and mouth disease in children.Acute EV71 infection may also cause severe polio-like neurological diseases and significant mortality.