Innate myeloid cell TNFR1 mediates first line defence against primary Mycobacterium tuberculosis infection

Sci Rep. 2016 Mar 2:6:22454. doi: 10.1038/srep22454.

Abstract

TNF is crucial for controlling Mycobacterium tuberculosis infection and understanding how will help immunomodulating the host response. Here we assessed the contribution of TNFR1 pathway from innate myeloid versus T cells. We first established the prominent role of TNFR1 in haematopoietic cells for controlling M. tuberculosis in TNFR1 KO chimera mice. Further, absence of TNFR1 specifically on myeloid cells (M-TNFR1 KO) recapitulated the uncontrolled M. tuberculosis infection seen in fully TNFR1 deficient mice, with increased bacterial burden, exacerbated lung inflammation, and rapid death. Pulmonary IL-12p40 over-expression was attributed to a prominent CD11b(+) Gr1(high) cell population in infected M-TNFR1 KO mice. By contrast, absence of TNFR1 on T-cells did not compromise the control of M. tuberculosis infection over 6-months. Thus, the protective TNF/TNFR1 pathway essential for controlling primary M. tuberculosis infection depends on innate macrophage and neutrophil myeloid cells, while TNFR1 pathway in T cells is dispensable.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Bone Marrow Cells / metabolism*
  • Cytokines / metabolism
  • Immunity, Innate*
  • Lung / metabolism
  • Mice
  • Mice, Knockout
  • Mycobacterium tuberculosis / pathogenicity*
  • Receptors, Tumor Necrosis Factor, Type I / genetics
  • Receptors, Tumor Necrosis Factor, Type I / physiology*
  • Tuberculosis / metabolism
  • Tuberculosis / physiopathology

Substances

  • Cytokines
  • Receptors, Tumor Necrosis Factor, Type I