Identification of novel viral interleukin-10 isoforms of human cytomegalovirus AD169

Yi Ling Lin, Pei Ching Chang, Yixiang Wang, Mengtao Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Two products of human cytomegalovirus (HCMV) UL111a gene have been previously identified to resemble human IL-10 (hIL-10). These viral IL-10s (vIL-10s) are able to induce signal transduction events and biological activities in a variety of cells. In this study, five novel vIL-10 transcripts were identified from HCMV AD169 infected MRC-5 cells. Some vIL-10 isoforms were post-translationally glycosylated, depending on the existence of a predicted N-linked glycosylation site. Similar to hIL-10, four of the vIL-10 isoforms apparently formed putative dimers. Among the different vIL-10 isoforms, vIL-10A significantly induced the phosphorylation of transcription factor STAT3 in THP-1 cells. All identified vIL-10 isoforms were able to form complexes with hIL-10, and enhanced hIL-10-induced STAT3 phosphorylation in different degrees. Identification of diverse forms of vIL-10 suggests that HCMV has developed a sophisticated mechanism to interfere with hIL-10 signaling pathway.

Original languageEnglish
Pages (from-to)213-223
Number of pages11
JournalVirus Research
Issue number2
StatePublished - Feb 2008


  • Cytomegalovirus
  • IL-10
  • vIL-10


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