The changes in gene expression observed using microarray technology might provide some useful data for the interaction between endothelial cells and influenza viruses. In the present study,we observed global patterns of gene expression in HUVECs at 24 h after inoculation with H9N2 viruses and viral particles. Microarray analysis showed that H9N2 virus infection induced an abundance of DEGs with over 2000 up-regulated genes and more than 4000 down-regulated genes compared to controls,atypical of transcriptional signature of viral infection. In contrast,H9N2
viral particles inoculation yielded only a small numbers of DEGs with 177 up-regulated genes and 86 down-regulated genes, indicating anon-infectious transcriptional signature.