Human lymphoid organ cDC2 and macrophages play complementary roles in T follicular helper responses.
J Exp Med
; 216(7): 1561-1581, 2019 07 01.
Article
em En
| MEDLINE
| ID: mdl-31072818
ABSTRACT
CD4+ T follicular helper (Tfh) cells are essential for inducing efficient humoral responses. T helper polarization is classically orientated by dendritic cells (DCs), which are composed of several subpopulations with distinct functions. Whether human DC subsets display functional specialization for Tfh polarization remains unclear. Here we find that tonsil cDC2 and CD14+ macrophages are the best inducers of Tfh polarization. This ability is intrinsic to the cDC2 lineage but tissue dependent for macrophages. We further show that human Tfh cells comprise two effector states producing either IL-21 or CXCL13. Distinct mechanisms drive the production of Tfh effector molecules, involving IL-12p70 for IL-21 and activin A and TGFß for CXCL13. Finally, using imaging mass cytometry, we find that tonsil CD14+ macrophages localize in situ in the B cell follicles, where they can interact with Tfh cells. Our results indicate that human lymphoid organ cDC2 and macrophages play complementary roles in the induction of Tfh responses.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Linfócitos T Auxiliares-Indutores
/
Tecido Linfoide
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Macrófagos
Limite:
Humans
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article