Quantitative phosphoproteomic analysis of host responses in human lung epithelial (A549) cells during influenza virus infection

Clyde Dapat, Reiko Saito, Hiroshi Suzuki, Tsuneyoshi Horigome

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


The emergence of antiviral drug-resistant influenza viruses highlights the need for alternative therapeutic strategies. Elucidation of host factors required during virus infection provides information not only on the signaling pathways involved but also on the identification of novel drug targets. RNA interference screening method had been utilized by several studies to determine these host factors; however, proteomics data on influenza host factors are currently limited. In this study, quantitative phosphoproteomic analysis of human lung cell line (A549) infected with 2009 pandemic influenza virus A (H1N1) virus was performed. Phosphopeptides were enriched from tryptic digests of total protein of infected and mock-infected cells using a titania column on an automated purification system followed by iTRAQ labeling. Identification and quantitative analysis of iTRAQ-labeled phosphopeptides were performed using LC-MS/MS. We identified 366 phosphorylation sites on 283 proteins. Of these, we detected 43 upregulated and 35 downregulated proteins during influenza virus infection. Gene ontology enrichment analysis showed that majority of the identified proteins are phosphoproteins involved in RNA processing, immune system process and response to infection. Host-virus interaction network analysis had identified 23 densely connected subnetworks. Of which, 13 subnetworks contained proteins with altered phosphorylation levels during by influenza virus infection. Our results will help to identify potential drug targets that can be pursued for influenza antiviral drug development.

Original languageEnglish
Pages (from-to)53-63
Number of pages11
JournalVirus Research
Issue number1
Publication statusPublished - 2014 Jan 22
Externally publishedYes


  • Host cell response
  • Influenza A virus
  • LC-MS/MS
  • Quantitative phosphoproteomics

ASJC Scopus subject areas

  • Virology
  • Infectious Diseases
  • Cancer Research


Dive into the research topics of 'Quantitative phosphoproteomic analysis of host responses in human lung epithelial (A549) cells during influenza virus infection'. Together they form a unique fingerprint.

Cite this