Profiling of EBV-Encoded microRNAs in EBV-Associated Hemophagocytic Lymphohistiocytosis

Tohoku J Exp Med. 2015 Oct;237(2):117-26. doi: 10.1620/tjem.237.117.

Abstract

Epstein-Barr virus-associated hemophagocytic lymphohistiocytosis (EBV-HLH) is a life-threatening complication of EBV infection. MicroRNAs (miRNAs) were small non-coding RNA, and EBV could encode miRNAs that are involved in the progression of infection. However, the profiles of EBV-miRNAs in EBV-HLH were unknown. Here, we aimed to profile the expression of EBV-miRNAs in children with EBV-HLH by analyzing 44 known EBV-miRNAs, encoded within the BamHI fragment H rightward open reading frame 1 (BHRF1) and the BamHI-A region rightward transcript (BART), in plasma and cellular targets by real-time quantitative PCR. The study included 15 children with EBV-HLH, 15 children with infectious mononucleosis (IM), and 15 healthy controls. CD8(+) T cells were found to be the cellular target of EBV infection in EBV-HLH, while CD19(+) B cells were infected with EBV in IM. We also found the greater levels of several miRNAs encoded by BART in EBV-HLH, compared to those in IM and healthy controls, whereas the levels of BHRF1 miRNAs were lower than those in IM. The profile and pattern of EBV-miRNAs in EBV-HLH indicated that EBV could display type II latency in EBV-HLH. Importantly, the level of plasma miR-BART16-1 continued decreasing during the whole chemotherapy, suggesting that plasma miR-BART16-1 could be a potential biomarker for monitoring EBV-HLH progression. The pathogenesis of EBV-HLH might be attributed to the abundance of EBV-miRNAs in EBV-HLH. These findings help elucidate the roles of EBV miRNAs in EBV-HLH, enabling the understanding of the basis of this disease and providing clues for its treatment.

MeSH terms

  • Biomarkers
  • CD8-Positive T-Lymphocytes / chemistry
  • CD8-Positive T-Lymphocytes / metabolism
  • Carrier State / virology
  • Child
  • Child, Preschool
  • Deoxyribonuclease BamHI / genetics
  • Epstein-Barr Virus Infections / complications*
  • Epstein-Barr Virus Infections / drug therapy
  • Epstein-Barr Virus Infections / mortality
  • Female
  • Herpesvirus 4, Human / genetics*
  • Humans
  • Infectious Mononucleosis / virology
  • Lymphohistiocytosis, Hemophagocytic / drug therapy
  • Lymphohistiocytosis, Hemophagocytic / etiology*
  • Lymphohistiocytosis, Hemophagocytic / mortality
  • Male
  • MicroRNAs / genetics*
  • Polymerase Chain Reaction
  • RNA, Viral / genetics*
  • Treatment Outcome

Substances

  • Biomarkers
  • MicroRNAs
  • RNA, Viral
  • Deoxyribonuclease BamHI