Abstract:
:High-density (resting) murine Lyt-2+ T cells exposed in vitro to the ligand concanavalin A (Con A), or immobilized F23.1 monoclonal antibody (mAb) recognizing an allotypic determinant on the T-cell receptor (TCR), or high-density (resting) allogeneic B stimulator cells remain IL-2-unresponsive; such cells do not express functional IL-2 receptors unless reconstituted with accessory cells. We conclude that cross-linking of TCR is insufficient as signal to induce IL-2 responsiveness, that is, activation. Both the macrophage product RIF and the T-cell product interleukin-4 efficiently induce the IL-2 responsiveness in resting Lyt-2+ T cells exposed in vitro either to the ligand Con A, or to immobilized F23 mAb, or to nonimmunogenic allogeneic stimulator cells. We conclude that two restricting points control the induction of IL-2 responsiveness (activation) in antigen-driven Lyt-2+ T-cell responses, that is, cross-linking of TCR by way of presented antigen and "costimulator" activity expressed by accessory cells. Both RIF and IL-4 express costimulator activity, therefore replacing the requirement for accessory cells.
journal_name
Ann N Y Acad Scijournal_title
Annals of the New York Academy of Sciencesauthors
Wagner H,Heeg K,Hardt Cdoi
10.1111/j.1749-6632.1988.tb36332.xsubject
Has Abstractpub_date
1988-01-01 00:00:00pages
128-35eissn
0077-8923issn
1749-6632journal_volume
532pub_type
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