Regulation of pulmonary plasma cell responses during secondary infection with influenza virus.
J Exp Med
; 221(7)2024 Jul 01.
Article
in En
| MEDLINE
| ID: mdl-38661717
ABSTRACT
During secondary infection with influenza virus, plasma cells (PCs) develop within the lung, providing a local source of antibodies. However, the site and mechanisms that regulate this process are poorly defined. Here, we show that while circulating memory B cells entered the lung during rechallenge and were activated within inducible bronchus-associated lymphoid tissues (iBALTs), resident memory B (BRM) cells responded earlier, and their activation occurred in a different niche directly near infected alveoli. This process required NK cells but was largely independent of CD4 and CD8 T cells. Innate stimuli induced by virus-like particles containing ssRNA triggered BRM cell differentiation in the absence of cognate antigen, suggesting a low threshold of activation. In contrast, expansion of PCs in iBALTs took longer to develop and was critically dependent on CD4 T cells. Our work demonstrates that spatially distinct mechanisms evolved to support pulmonary secondary PC responses, and it reveals a specialized function for BRM cells as guardians of the alveoli.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Plasma Cells
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CD4-Positive T-Lymphocytes
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Orthomyxoviridae Infections
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Lung
Limits:
Animals
Language:
En
Journal:
J Exp Med
Year:
2024
Document type:
Article
Affiliation country:
Country of publication: