Impact of macrophage and dendritic cell subset elimination on antiviral immunity, viral clearance and production of type 1 interferon

Virology. 2005 Nov 25;342(2):177-89. doi: 10.1016/j.virol.2005.07.031. Epub 2005 Sep 6.


We report herein that vesicular stomatitis virus (VSV) induced a concurrent primary Th1 (T helper 1) and Th2 cytokine response detectable ex vivo. Liposome-encapsulated clodronate-mediated elimination of CD8- marginal dendritic cells (DCs) and splenic macrophages (m Phi), but not CD8+ interdigitating DCs, prior to infection resulted in a markedly diminished chemokine and Th1 (IL-2, interferon-gamma) cytokine response, although the Th2 response (IL-4) remained relatively intact. Repopulation with marginal DCs and marginal metallophilic macrophages (MMM) restored Th1 cytokine profiles but did not restore chemokine responsiveness or reduce VSV-induced morbidity/mortality. Chemokine competency returned approximately 4 weeks post-depletion, which correlated temporally with repopulation of the spleen with marginal zone macrophages (MZM) and red pulp macrophages (RPM). Unexpectedly, virus-induced morbidity persisted for over 1 month post-depletion and was associated with virus dissemination and distinctive histological lesions in the liver. Depletion of interferon-producing plasmacytoid dendritic cells did not account for virus-induced morbidity because serum levels of type I interferon were not diminished in Cl2MBP-liposome-treated mice. Thus, distinct m Phi subsets are critical for chemokine production and viral clearance, and, in their absence, VSV disseminates even in the presence of high titers of interferon.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • CD8 Antigens / immunology
  • Dendritic Cells / immunology*
  • Interferon Type I / blood
  • Interferon-gamma / biosynthesis
  • Interleukin-2 / biosynthesis
  • Interleukin-4 / biosynthesis
  • Macrophages / immunology*
  • Mice
  • Mice, Inbred BALB C
  • Rhabdoviridae Infections / blood
  • Rhabdoviridae Infections / immunology*
  • Rhabdoviridae Infections / virology
  • Spleen / immunology
  • Vesicular stomatitis Indiana virus / immunology*


  • CD8 Antigens
  • Interferon Type I
  • Interleukin-2
  • Interleukin-4
  • Interferon-gamma