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Division of Rheumatology, Immunology, and Allergy, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115
Although dendritic cells (DC) are potent APC that prime T cells against many pathogens, there is no direct evidence that DC are required for immunity to Mycobacterium tuberculosis (Mtb) infection. The requirement for DC to prime the CD4+ T cell response following Mtb infection was investigated using pCD11c-diptheria toxin receptor/GFP transgenic mice, in which DC can be transiently ablated in vivo. We show a critical role for DC in initiation of the CD4+ T cell response to the mycobacterial Ag early secretory Ag of tuberculosis 6. The delay in initiating the Ag-specific T cell response led to impaired control of Mtb replication. Interestingly, DC were not required for the secondary CD4+ T cell response following Mtb infection in peptide-vaccinated mice. Thus, this study shows that DC are essential for the initiation of the adaptive T cell response to the human pathogen Mtb.
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