MyD88 plays a critical T cell-intrinsic role in supporting CD8 T cell expansion during acute lymphocytic choriomeningitis virus infection

J Immunol. 2008 Sep 15;181(6):3804-10. doi: 10.4049/jimmunol.181.6.3804.


During acute lymphocytic choriomeningitis virus (LCMV) infection, CD8 T cells rapidly expand and differentiate into effectors that are required for viral clearance. The accumulation of activated T cells is greatly reduced in mice lacking the adaptor molecule MyD88. Although MyD88 has generally been considered to indirectly regulate adaptive immune responses by controlling inflammatory cytokine production and Ag presentation in innate immune cells, in this study, we identify an unappreciated cell-intrinsic role for MyD88 in LCMV-specific CD8 T cells. Using reciprocal adoptive transfer models and bone marrow chimeras, we show that Myd88(-/-) CD8 T cells are defective in their clonal expansion in response to LCMV infection, independent of their environment. Furthermore, we show that while MyD88 is dispensable for initial activation and division of LCMV-specific CD8 T cells during the early stages of viral infection, MyD88-dependent signals are critical for supporting their survival and sustained accumulation.

Publication types

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

MeSH terms

  • Acute Disease
  • Adoptive Transfer
  • Animals
  • CD8-Positive T-Lymphocytes / immunology*
  • CD8-Positive T-Lymphocytes / pathology*
  • CD8-Positive T-Lymphocytes / transplantation
  • CD8-Positive T-Lymphocytes / virology
  • Cell Proliferation*
  • Cell Survival / genetics
  • Cell Survival / immunology
  • Cells, Cultured
  • Clone Cells
  • Epitopes, T-Lymphocyte / immunology*
  • Immunologic Memory / genetics
  • Lymphocytic Choriomeningitis / immunology*
  • Lymphocytic Choriomeningitis / metabolism
  • Lymphocytic Choriomeningitis / pathology*
  • Lymphocytic choriomeningitis virus / immunology*
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Mice, Transgenic
  • Myeloid Differentiation Factor 88 / deficiency
  • Myeloid Differentiation Factor 88 / genetics
  • Myeloid Differentiation Factor 88 / physiology*
  • Signal Transduction / genetics
  • Signal Transduction / immunology


  • Epitopes, T-Lymphocyte
  • Myd88 protein, mouse
  • Myeloid Differentiation Factor 88