Intestinal Monocyte-Derived Macrophages Control Commensal-Specific Th17 Responses.
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.
Department of Microbiology and Immunology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.
Casandra
C
Panea
Department of Microbiology and Immunology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.
Adam M
AM
Farkas
Department of Microbiology and Immunology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.
Yoshiyuki
Y
Goto
Department of Microbiology and Immunology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.
Shahla
S
Abdollahi-Roodsaz
Department of Microbiology and Immunology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.
Carolyn
C
Lee
Department of Microbiology and Immunology, College of Medicine and Milton S. Hershey Medical Center, Pennsylvania State University, Hershey, PA 17033, USA.
Balázs
B
Koscsó
Department of Microbiology and Immunology, College of Medicine and Milton S. Hershey Medical Center, Pennsylvania State University, Hershey, PA 17033, USA.
Kavitha
K
Gowda
Infectious Diseases Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.
Tobias M
TM
Hohl
Department of Microbiology and Immunology, College of Medicine and Milton S. Hershey Medical Center, Pennsylvania State University, Hershey, PA 17033, USA.
Milena
M
Bogunovic
Department of Microbiology and Immunology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA. Electronic address: ii2137@cumc.columbia.edu.
Ivaylo I
II
Ivanov
D000818:Animals; D015703:Antigens, CD / Q000235:genetics / Q000378:metabolism; D000073883:CX3C Chemokine Receptor 1; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000276:immunology; D039001:Integrin alpha Chains / Q000235:genetics / Q000378:metabolism; D007413:Intestinal Mucosa / Q000276:immunology* / Q000382:microbiology; D008264:Macrophages / Q000276:immunology*; D051379:Mice; D064307:Microbiota / Q000276:immunology*; D019707:Receptors, Chemokine / Q000235:genetics / Q000378:metabolism; D058504:Th17 Cells / Q000276:immunology*
D015703:Antigens, CD; D000073883:CX3C Chemokine Receptor 1; C471885:Cx3cr1 protein, mouse; D039001:Integrin alpha Chains; D019707:Receptors, Chemokine; C091367:alpha E integrins