Intestinal Monocyte-Derived Macrophages Control Commensal-Specific Th17 Responses

Cell Rep. 2015 Aug 25;12(8):1314-24. doi: 10.1016/j.celrep.2015.07.040. Epub 2015 Aug 13.


Generation of different CD4 T cell responses to commensal and pathogenic bacteria is crucial for maintaining a healthy gut environment, but the associated cellular mechanisms are poorly understood. Dendritic cells (DCs) and macrophages (Mfs) integrate microbial signals and direct adaptive immunity. Although the role of DCs in initiating T cell responses is well appreciated, how Mfs contribute to the generation of CD4 T cell responses to intestinal microbes is unclear. Th17 cells are critical for mucosal immune protection and at steady state are induced by commensal bacteria, such as segmented filamentous bacteria (SFB). Here, we examined the roles of mucosal DCs and Mfs in Th17 induction by SFB in vivo. We show that Mfs, and not conventional CD103(+) DCs, are essential for the generation of SFB-specific Th17 responses. Thus, Mfs drive mucosal T cell responses to certain commensal bacteria.

Publication types

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

MeSH terms

  • Animals
  • Antigens, CD / genetics
  • Antigens, CD / metabolism
  • CX3C Chemokine Receptor 1
  • Cells, Cultured
  • Dendritic Cells / immunology
  • Integrin alpha Chains / genetics
  • Integrin alpha Chains / metabolism
  • Intestinal Mucosa / immunology*
  • Intestinal Mucosa / microbiology
  • Macrophages / immunology*
  • Mice
  • Microbiota / immunology*
  • Receptors, Chemokine / genetics
  • Receptors, Chemokine / metabolism
  • Th17 Cells / immunology*


  • Antigens, CD
  • CX3C Chemokine Receptor 1
  • Cx3cr1 protein, mouse
  • Integrin alpha Chains
  • Receptors, Chemokine
  • alpha E integrins