Date Published:

Abstract:

Skin conventional dendritic cells (cDCs) exist as two distinct subsets, cDC1s and cDC2s, which maintain the balance of immunity to pathogens and tolerance to self and microbiota. Here, we examined the roles of dermal cDC1s and cDC2s during bacterial infection, notably Propionibacterium acnes (P. acnes). cDC1s, but not cDC2s, regulated the magnitude of the immune response to P. acnes in the murine dermis by controlling neutrophil recruitment to the inflamed site and survival and function therein. Single-cell mRNA sequencing revealed that this regulation relied on secretion of the cytokine vascular endothelial growth factor alpha (VEGF-alpha) by a minor subset of activated EpCAM(+)CD59(+)Ly-6D(+) cDC1s. Neutrophil recruitment by dermal cDC1s was also observed during S. aureus, bacillus Calmette-Guerin (BCG), or E. coli infection, as well as in a model of bacterial insult in human skin. Thus, skin cDC1s are essential regulators of the innate response in cutaneous immunity and have roles beyond classical antigen presentation.

Notes:

Janela, BaptistePatel, Amit ALau, Mai ChanGoh, Chi ChingMsallam, RashaKong, Wan TingFehlings, MichaelHubert, SandraLum, JosephineSimoni, YannickMalleret, BenoitZolezzi, FrancescaChen, JinmiaoPoidinger, MichaelSatpathy, Ansuman TBriseno, CarlosWohn, ChristianMalissen, BernardMurphy, Kenneth MMaini, Alexander AVanhoutte, LeenGuilliams, MartinVial, EmmanuelHennequin, LaurentNewell, EvanNg, Lai GuanMusette, PhilippeYona, SimonHacini-Rachinel, FerielGinhoux, FlorentengResearch Support, Non-U.S. Gov'tVideo-Audio MediaImmunity. 2019 Apr 16;50(4):1069-1083.e8. doi: 10.1016/j.immuni.2019.03.001. Epub 2019 Mar 27.