Skin-resident CD4+ T cells protect against Leishmania major by recruiting and activating inflammatory monocytes

PLoS Pathogens

Susan W. Volk¹  Nelson D. Glennie²  Phillip Scott² 

[1] Department of Clinical Studies-Philadelphia, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America;Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America

关键词: Parasitic diseases;    T cells;    Monocytes;    Inflammation;    Skin grafting;    Immune response;    Memory T cells;    Ear infections;   

DOI  :  10.1371/journal.ppat.1006349

学科分类：生物科学（综合）

来源: Public Library of Science

【 摘 要 】

Tissue-resident memory T cells are required for establishing protective immunity against a variety of different pathogens, although the mechanisms mediating protection by CD4+ resident memory T cells are still being defined. In this study we addressed this issue with a population of protective skin-resident, IFNγ-producing CD4+ memory T cells generated following Leishmania major infection. We previously found that resident memory T cells recruit circulating effector T cells to enhance immunity. Here we show that resident memory CD4+ T cells mediate the delayed-hypersensitivity response observed in immune mice and provide protection without circulating T cells. This protection occurs rapidly after challenge, and requires the recruitment and activation of inflammatory monocytes, which limit parasites by production of both reactive oxygen species and nitric oxide. Overall, these data highlight a novel role for tissue-resident memory cells in recruiting and activating inflammatory monocytes, and underscore the central role that skin-resident T cells play in immunity to cutaneous leishmaniasis.

【 授权许可】

CC BY