tetano
Editor, Senior Moderator
J Exp Med
. 2021 Jan 4;218(1):e20200218.
doi: 10.1084/jem.20200218.
Influenza infection fortifies local lymph nodes to promote lung-resident heterosubtypic immunity
Daniel H Paik[SUP] 1 2 [/SUP], Donna L Farber[SUP] 1 2 3 [/SUP]
Affiliations
Abstract
Influenza infection generates tissue-resident memory T cells (TRMs) that are maintained in the lung and can mediate protective immunity to heterologous influenza strains, but the precise mechanisms of local T cell-mediated protection are not well understood. In a murine heterosubtypic influenza challenge model, we demonstrate that protective lung T cell responses derive from both in situ activation of TRMs and the enhanced generation of effector T cells from the local lung draining mediastinal lymph nodes (medLNs). Primary infection fortified the medLNs with an increased number of conventional dendritic cells (cDCs) that mediate enhanced priming of T cells, including those specific for newly encountered epitopes; cDC depletion during the recall response diminished medLN T cell generation and heterosubtypic immunity. Our study shows that during a protective recall response, cDCs in a fortified LN environment enhance the breadth, generation, and tissue migration of effector T cells to augment lung TRM responses.
. 2021 Jan 4;218(1):e20200218.
doi: 10.1084/jem.20200218.
Influenza infection fortifies local lymph nodes to promote lung-resident heterosubtypic immunity
Daniel H Paik[SUP] 1 2 [/SUP], Donna L Farber[SUP] 1 2 3 [/SUP]
Affiliations
- PMID: 33005934
- DOI: 10.1084/jem.20200218
Abstract
Influenza infection generates tissue-resident memory T cells (TRMs) that are maintained in the lung and can mediate protective immunity to heterologous influenza strains, but the precise mechanisms of local T cell-mediated protection are not well understood. In a murine heterosubtypic influenza challenge model, we demonstrate that protective lung T cell responses derive from both in situ activation of TRMs and the enhanced generation of effector T cells from the local lung draining mediastinal lymph nodes (medLNs). Primary infection fortified the medLNs with an increased number of conventional dendritic cells (cDCs) that mediate enhanced priming of T cells, including those specific for newly encountered epitopes; cDC depletion during the recall response diminished medLN T cell generation and heterosubtypic immunity. Our study shows that during a protective recall response, cDCs in a fortified LN environment enhance the breadth, generation, and tissue migration of effector T cells to augment lung TRM responses.