Abstract:
:We evaluated changes in the signaling potentials and proliferative capacity of single antigen-specific T helper (TH) cells during a primary immune response to a protein antigen. At the peak of cellular expansion in vivo all antigen-specific TH cells exhibited a profound block in CD3- and CD4-mediated mobilization of intracellular calcium together with a more global block in T cell receptor-independent capacitative calcium entry (CCE). The proliferative response of these antigen-specific TH cells to anti-CD3, anti-CD28 and IL-2 was also severely blunted. Cross-linking CD69 on a substantial fraction of CD69+ antigen-specific TH cells relieved this block in CCE and restored proliferative capacity in vitro. The CCE rescue operated through a CD69-coupled G protein and required calcium-bound calmodulin and calcineurin. These data reveal critical changes in the responsiveness of antigen-specific TH cells and provide evidence of new mechanisms for the regulation of antigen-specific TH cell development in vivo.
journal_name
Nat Immunoljournal_title
Nature immunologyauthors
Bikah G,Pogue-Caley RR,McHeyzer-Williams LJ,McHeyzer-Williams MGdoi
10.1038/80841keywords:
subject
Has Abstractpub_date
2000-11-01 00:00:00pages
402-12issue
5eissn
1529-2908issn
1529-2916journal_volume
1pub_type
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