Perivascular dendritic cells elicit anaphylaxis by relaying allergens to mast cells via microvesicles

Hae Woong Choi, Jutamas Suwanpradid, Il Hwan Kim, Herman F. Staats, Muzlifah Haniffa, Amanda S. MacLeod, Soman N. Abraham

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


Anaphylactic reactions are triggered when allergens enter the blood circulation and activate immunoglobulin E (IgE)–sensitized mast cells (MCs), causing systemic discharge of prestored proinflammatory mediators. As MCs are extravascular, how they perceive circulating allergens remains a conundrum. Here, we describe the existence of a CD301b+ perivascular dendritic cell (DC) subset that continuously samples blood and relays antigens to neighboring MCs, which vigorously degranulate and trigger anaphylaxis. DC antigen transfer involves the active discharge of surface-associated antigens on 0.5- to 1.0-micrometer microvesicles (MVs) generated by vacuolar protein sorting 4 (VPS4). Antigen sharing by DCs is not limited to MCs, as neighboring DCs also acquire antigen-bearing MVs.This capacity of DCs to distribute antigen-bearing MVs to various immune cells in the perivascular space potentiates inflammatory and immune responses to blood-borne antigens.

Original languageEnglish
Article numbereaao0666
Issue number6415
Publication statusPublished - 2018 Nov 9
Externally publishedYes

ASJC Scopus subject areas

  • General


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