Interferon-γ Production by Tfh Cells is Required for CXCR3 Pre-memory B Cell Differentiation and Subsequent Lung-resident Memory B Cell Responses
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Lung-resident memory B cells (lung-BRMs) differentiate into plasma cells after reinfection, providing enhanced pulmonary protection. Here, we investigated the determinants of lung-BRM differentiation upon influenza infection. Kinetic analyses revealed that influenza nucleoprotein (NP)-specific BRMs preferentially differentiated early after infection and required T follicular helper (Tfh) cell help. BRM differentiation temporally coincided with transient interferon (IFN)-γ production by Tfh cells. Depletion of IFN-γ in Tfh cells prevented lung-BRM differentiation and impaired protection against heterosubtypic infection. IFN-γ was required for expression of the transcription factor T-bet by germinal center (GC) B cells, which promoted differentiation of a CXCR3 GC B cell subset that were precursors of lung-BRMs and CXCR3 memory B cells in the mediastinal lymph node. Absence of IFN-γ signaling or T-bet in GC B cells prevented CXCR3 pre-memory precursor development and hampered CXCR3 memory B cell differentiation and subsequent lung-BRM responses. Thus, Tfh-cell-derived IFN-γ is critical for lung-BRM development and pulmonary immunity, with implications for vaccination strategies targeting BRMs.
Wang C, Chen Y, Yang B, Yang J, Wang W, Zeng Y Front Immunol. 2025; 16:1528707.
PMID: 39949783 PMC: 11821646. DOI: 10.3389/fimmu.2025.1528707.
B cells in non-lymphoid tissues.
Samiea A, Celis G, Yadav R, Rodda L, Moreau J Nat Rev Immunol. 2025; .
PMID: 39910240 DOI: 10.1038/s41577-025-01137-6.
TIGITTfh show poor B-helper function and negatively correlate with SARS-CoV-2 antibody titre.
Edner N, Houghton L, Ntavli E, Rees-Spear C, Petersone L, Wang C Front Immunol. 2024; 15:1395684.
PMID: 38868776 PMC: 11167088. DOI: 10.3389/fimmu.2024.1395684.
Wellford S, Schwartzberg P Curr Opin Immunol. 2024; 87:102421.
PMID: 38733669 PMC: 11482284. DOI: 10.1016/j.coi.2024.102421.
Regulation of pulmonary plasma cell responses during secondary infection with influenza virus.
MacLean A, Bonifacio J, Oram S, Mohsen M, Bachmann M, Arnon T J Exp Med. 2024; 221(7).
PMID: 38661717 PMC: 11044945. DOI: 10.1084/jem.20232014.