T‐follicular helper cells survive as long‐term memory cells

JP Weber, F Fuhrmann, A Hutloff - European journal of …, 2012 - Wiley Online Library
JP Weber, F Fuhrmann, A Hutloff
European journal of immunology, 2012Wiley Online Library
T‐follicular helper (TFH) cells represent the subpopulation of CD 4+ T cells that provides
help for antigen‐specific B cells in the GC response. They are generated from naïve T cells
during an immune response and are imprinted by their master transcription factor B cl‐6. It
has been a long‐standing question if TFH cells contribute to the CD 4+ memory pool after
the GC response has been terminated. To answer this question, we sorted antigen‐specific
TFH and non‐TFH effector cells from an ongoing GC response and transferred them into …
T‐follicular helper (TFH) cells represent the subpopulation of CD4+ T cells that provides help for antigen‐specific B cells in the GC response. They are generated from naïve T cells during an immune response and are imprinted by their master transcription factor Bcl‐6. It has been a long‐standing question if TFH cells contribute to the CD4+ memory pool after the GC response has been terminated. To answer this question, we sorted antigen‐specific TFH and non‐TFH effector cells from an ongoing GC response and transferred them into naïve mice. Without further signals via the TCR, transferred cells rapidly contracted with a small population of both TFH and non‐TFH cells surviving as memory cells in peripheral lymphoid organs for at least 4 weeks in the absence of antigen. TFH cells strongly downregulated their signature genes Bcl‐6, CXCR5, and PD‐1 in the memory phase. Upon rechallenge with antigen they rapidly upregulated these markers again. An enhanced potential to produce IL‐21, paired with higher expression of CXCR5 and lower expression of CCR7, should enable TFH memory cells to provide more efficient help for antigen‐specific B cells than their non‐TFH counterparts.
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