Continued Bcl6 Expression Prevents the Transdifferentiation of Established Tfh Cells into Th1 Cells during Acute Viral Infection

Dominik Alterauge, Johannes W. Bagnoli, Frank Dahlström, Barry M. Bradford, Neil A. Mabbott, Thorsten Buch, Wolfgang Enard, Dirk Baumjohann

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

T follicular helper (Tfh) cells are crucial for the establishment of germinal centers (GCs) and potent antibody responses. Nevertheless, the T cell-intrinsic factors that are required for the maintenance of already-established Tfh cells and GCs remain largely unknown. Here, we use temporally guided gene ablation in CD4+ T cells to dissect the contributions of the Tfh-associated chemokine receptor CXCR5 and the transcription factor Bcl6. Induced ablation of Cxcr5 has minor effects on the function of established Tfh cells, and Cxcr5-ablated cells still exhibit most of the features of CXCR5+ Tfh cells. In contrast, continued Bcl6 expression is critical to maintain the GC Tfh cell phenotype and also the GC reaction. Importantly, Bcl6 ablation during acute viral infection results in the transdifferentiation of established Tfh into Th1 cells, thus highlighting the plasticity of Tfh cells. These findings have implications for strategies that boost or restrain Tfh cells and GCs in health and disease.

Original languageEnglish
Article number108232
JournalCell Reports
Volume33
Issue number1
DOIs
StatePublished - 6 Oct 2020
Externally publishedYes

Keywords

  • Bcl6
  • CXCR5
  • LCMV
  • T helper cell
  • Tfh cell
  • Th1
  • flexibility
  • germinal center
  • maintenance
  • plasticity

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