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

Perivascular dendritic cells elicit anaphylaxis by relaying allergens to mast cells via microvesicles.
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DOI:
10.1126/science.aao0666
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发表时间:
2018-11-09
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Abraham SN
Abraham SN
中科院分区:
其他
文献类型:
--
作者:
Choi HW;Suwanpradid J;Kim IH;Staats HF;Haniffa M;MacLeod AS;Abraham SN

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Anaphylactic reactions are triggered when allergens enter the blood circulation and activate IgE-sensitized mast cells (MCs) causing systemic discharge of prestored proinflammatory mediators. Since 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 0.5-1.0-μm 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 antigens-bearing MVs to various immune cells in the perivascular space potentiates inflammatory and immune responses to blood-borne antigens. Anaphylaxis is triggered by dendritic cells relaying blood-borne allergen on microvesicles to mast cells.
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