Reticuloendotheliosis virus strain T induces miR-155, which targets JARID2 and promotes cell survival Academic Article uri icon


MeSH Major

  • Gene Expression Regulation
  • Host-Pathogen Interactions
  • MicroRNAs
  • Nerve Tissue Proteins
  • Reticuloendotheliosis virus


  • The oncogenic microRNA miR-155 is upregulated by several oncogenic viruses. The precursor of miR-155, termed bic, was first observed to cooperate with myc in chicken B-cell lymphomas induced by avian leukosis proviral integrations. We identified another oncogenic retrovirus, reticuloendotheliosis virus strain T (REV-T), that upregulates miR-155 in chicken embryo fibroblasts. We also observed very high levels of miR-155 in REV-T-induced B-cell lymphomas. To study the role of miR-155 in these tumors, we identified JARID2/Jumonji, a cell cycle regulator and part of a histone methyltransferase complex, as a target of miR-155. The overexpression of miR-155 decreased levels of endogenous JARID2 mRNA. We confirmed that miR-155 directly targets both human and chicken JARID2 by assaying the repression of reporters containing the JARID2 3'-untranslated regions. Further, the overexpression of a sponge complementary to miR-155 in a tumor cell line increased endogenous JARID2 mRNA levels. The overexpression of JARID2 in chicken fibroblasts led to decreased cell numbers and an increase in apoptotic cells. The overexpression of miR-155 rescued cells undergoing cytopathic effect caused by infection with subgroup B avian retroviruses. Therefore, we propose that miR-155 has a prosurvival function that is mediated through the downregulation of targets including JARID2.

publication date

  • December 2009



  • Academic Article



  • eng

PubMed Central ID

  • PMC2786729

Digital Object Identifier (DOI)

  • 10.1128/JVI.01182-09

PubMed ID

  • 19759154

Additional Document Info

start page

  • 12009

end page

  • 17


  • 83


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