PMID- 27007674 OWN - NLM STAT- MEDLINE DCOM- 20171103 LR - 20230203 IS - 1935-3456 (Electronic) IS - 1933-0219 (Print) IS - 1933-0219 (Linking) VI - 9 IP - 6 DP - 2016 Nov TI - Regulatory T cells are essential to promote proper CD4 T-cell priming upon mucosal infection. PG - 1395-1406 LID - 10.1038/mi.2016.19 [doi] AB - Regulatory T cells (Tregs) limit autoimmunity and immunopathology using a variety of suppressive mechanisms, but their roles during pathogen-directed immune responses remain unclear. Following herpes simplex virus-2 (HSV-2) infection, mice lacking Tregs fail to control viral replication, pointing to a role for Tregs in facilitating productive immune responses. Using adoptive transfer of T-cell receptor transgenic CD4 T cells into Treg-sufficient or Treg-depleted mice prior to HSV-2 infection, we found that Tregs are required for timely accumulation of HSV-2-specific CD4 T cells within the infected tissues. Further, Tregs are critical for appropriate trafficking of dendritic cells (DCs) from the vaginal mucosa to the draining lymph nodes, which results in fully effective CD4 T-cell priming, activation, and ultimately migration to the infected tissues. Using CTLA-4 conditional knockout mice, we demonstrate that Tregs impact DC migration through a CTLA-4-mediated mechanism. Together, our data highlight the critical role of Tregs in proper potentiation of adaptive immune responses to microbial infection. FAU - Soerens, A G AU - Soerens AG AD - Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA. AD - Graduate Program in Pathobiology, Department of Global Health, University of Washington, Seattle, Washington, USA. FAU - Da Costa, A AU - Da Costa A AD - Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA. AD - Graduate Program in Pathobiology, Department of Global Health, University of Washington, Seattle, Washington, USA. FAU - Lund, J M AU - Lund JM AD - Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA. AD - Graduate Program in Pathobiology, Department of Global Health, University of Washington, Seattle, Washington, USA. LA - eng GR - R01 AI087657/AI/NIAID NIH HHS/United States GR - T32 AI083203/AI/NIAID NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural DEP - 20160323 PL - United States TA - Mucosal Immunol JT - Mucosal immunology JID - 101299742 RN - 0 (CTLA-4 Antigen) RN - 0 (Epitopes) SB - IM MH - Animals MH - CD4-Positive T-Lymphocytes/*immunology/*metabolism MH - CTLA-4 Antigen/genetics/metabolism MH - Cell Communication/immunology MH - Cell Movement/immunology MH - Cells, Cultured MH - Dendritic Cells/immunology/metabolism MH - Disease Models, Animal MH - Epitopes/immunology MH - Female MH - Gene Expression MH - Herpes Genitalis/immunology/metabolism MH - Herpesvirus 2, Human/immunology MH - Host-Pathogen Interactions/*immunology MH - Humans MH - *Immunity, Mucosal MH - Immunomodulation MH - Mice MH - Models, Biological MH - Mucous Membrane/*immunology/*metabolism MH - T-Cell Antigen Receptor Specificity/immunology MH - T-Lymphocytes, Regulatory/*immunology/*metabolism MH - Vagina PMC - PMC5035160 MID - NIHMS760334 COIS- Disclosure. The authors declare no conflicts of interest. EDAT- 2016/03/24 06:00 MHDA- 2017/11/04 06:00 PMCR- 2016/10/14 CRDT- 2016/03/24 06:00 PHST- 2015/12/16 00:00 [received] PHST- 2016/02/05 00:00 [accepted] PHST- 2016/03/24 06:00 [pubmed] PHST- 2017/11/04 06:00 [medline] PHST- 2016/03/24 06:00 [entrez] PHST- 2016/10/14 00:00 [pmc-release] AID - S1933-0219(22)00783-8 [pii] AID - 10.1038/mi.2016.19 [doi] PST - ppublish SO - Mucosal Immunol. 2016 Nov;9(6):1395-1406. doi: 10.1038/mi.2016.19. Epub 2016 Mar 23.