HIV-1 intron-containing RNA expression induces innate immune activation and T cell dysfunction

Nat Commun. 2018 Aug 27;9(1):3450. doi: 10.1038/s41467-018-05899-7.

Abstract

Low levels of type I interferon (IFN-I) are thought to be a driving force for immune activation and T-cell exhaustion in HIV-1 infected individuals on combination antiretroviral therapy (cART), though the causative mechanisms for persistent IFN-I signaling have remained unclear. Here, we show Rev-CRM1-dependent nuclear export and peripheral membrane association of intron-containing HIV-1 RNA, independent of primary viral sequence or viral protein expression, is subject to sensing and signaling via MAVS, resulting in IFN-I-dependent pro-inflammatory responses in macrophages. Additionally, HIV-1 intron-containing-RNA-induced innate immune activation of macrophages leads to upregulation of inhibitory receptor expression and functional immune exhaustion of co-cultured T cells. Our findings suggest that persistent expression of HIV-1 intron-containing RNA in macrophages contributes to chronic immune activation and T-cell dysfunction and that use of HIV RNA expression inhibitors as adjunct therapy might abrogate aberrant inflammation and restore immune function in HIV-infected individuals on cART.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • HIV-1 / genetics*
  • HIV-1 / immunology
  • Humans
  • Immunity, Innate / genetics
  • Immunity, Innate / physiology*
  • Interferon Type I / metabolism
  • Introns / genetics*
  • Macrophages / metabolism
  • Myeloid Cells / metabolism
  • RNA / genetics*
  • RNA, Viral / genetics*
  • T-Lymphocytes / metabolism*

Substances

  • Interferon Type I
  • RNA, Viral
  • RNA