Effective CD4 T cell priming requires repertoire scanning by CD301b(+) migratory cDC2 cells upon lymph node entry.

Effective CD4 T cell priming requires repertoire scanning by CD301b(+) migratory cDC2 cells upon lymph node entry.
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DOI:
10.1126/sciimmunol.abg0336
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发表时间:
2021-12-10
期刊:
影响因子:
24.8
通讯作者:
Kumamoto Y
Kumamoto Y
中科院分区:
医学1区
文献类型:
--
作者:
Tatsumi N;Codrington AL;El-Fenej J;Phondge V;Kumamoto Y

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During the initiation of adaptive immune responses, millions of lymphocytes must be scanned to find the few cognate clones. The activation mechanisms of CD4 T cells have been extensively studied, but the cellular mechanisms that drive selection of cognate clones are not completely understood. Here, we show that recently homed naive polyclonal CD4 T cells are temporarily retained before leaving the lymph node. This stop-and-go traffic of CD4 T cells provides an adequate time window for efficient scanning and timely priming of antigen-specific cognate clones. CD301b+DCs, a major subset of migratory cDC2 cells, localize to the areas around high endothelial venules, where they retain incoming polyclonal CD4 T cells through MHCII-dependent, but antigen-independent mechanisms, while concurrently providing cognate stimuli for priming. These results indicate that CD301b+DCs function as an immunological “display window” for CD4 T cells to efficiently scan their antigen specificity. CD301b+ migratory cDC2 cells temporarily retain polyclonal CD4 T cells during priming to scan their antigen specificity
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