The CD4⁺ T-cell help signal is transmitted from APC to CD8⁺ T-cells via CD27-CD70 interactions.
The CD4⁺ T-cell help signal is transmitted from APC to CD8⁺ T-cells via CD27-CD70 interactions.
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DOI:
10.1038/ncomms1948
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发表时间:
2012-07-10
影响因子:
16.6
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中科院分区:
文献类型:
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CD8 + cytotoxic T lymphocytes are critical components of immunity against infectious pathogens, tumours, and in the case of pathogenic autoimmunity, normal self tissues. CD4 + T (TH) cells provide ‘help’ to CD8 + cytotoxic T lymphocytes during priming by first activating antigen-presenting cells via CD40–CD40L interactions. Here we show that, after immunization with either a noninflammatory, nonreplicating antigen or an overtly inflammatory replicating antigen, CD8 + cytotoxic T lymphocytes prevented from receiving a signal through CD27 during priming subsequently exhibit a specific defect in their capacity for secondary expansion that can be rescued by the absence of TRAIL. Thus, the ‘help message’ is transmitted to CD8 + T cells via CD70–CD27 signals, enabling them to undergo secondary expansion and avoid TRAIL-mediated apoptosis on re-stimulation. These findings complete our understanding of the cellular interactions through which TH is provided to CD8 + cytotoxic T lymphocytes during priming.
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