Circulating precursor CCR7(lo)PD-1(hi) CXCR5⺠CD4⺠T cells indicate Tfh cell activity and promote antibody responses upon antigen reexposure.
Immunity
; 39(4): 770-81, 2013 Oct 17.
Article
in En
| MEDLINE
| ID: mdl-24138884
ABSTRACT
Follicular B helper T (Tfh) cells support high affinity and long-term antibody responses. Here we found that within circulating CXCR5⺠CD4⺠T cells in humans and mice, the CCR7(lo)PD-1(hi) subset has a partial Tfh effector phenotype, whereas CCR7(hi)PD-1(lo) cells have a resting phenotype. The circulating CCR7(lo)PD-1(hi) subset was indicative of active Tfh differentiation in lymphoid organs and correlated with clinical indices in autoimmune diseases. Thus the CCR7(lo)PD-1(hi) subset provides a biomarker to monitor protective antibody responses during infection or vaccination and pathogenic antibody responses in autoimmune diseases. Differentiation of both CCR7(hi)PD-1(lo) and CCR7(lo)PD-1(hi) subsets required ICOS and BCL6, but not SAP, suggesting that circulating CXCR5⺠helper T cells are primarily generated before germinal centers. Upon antigen reencounter, CCR7(lo)PD-1(hi) CXCR5⺠precursors rapidly differentiate into mature Tfh cells to promote antibody responses. Therefore, circulating CCR7(lo)PD-1(hi) CXCR5⺠CD4⺠T cells are generated during active Tfh differentiation and represent a new mechanism of immunological early memory.
Full text:
1
Database:
MEDLINE
Main subject:
T-Lymphocytes, Helper-Inducer
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Receptors, CXCR
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Receptors, CXCR5
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Programmed Cell Death 1 Receptor
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Immunologic Memory
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Antibodies
Limits:
Animals
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Humans
Language:
En
Year:
2013
Type:
Article