Cytolytic T lymphocyte clones that proliferate autonomously to specific alloantigenic stimulation. II. Relationship of the Lyt-2 molecular complex to cytolytic activity, proliferation, and lymphokine secretion
Glasebrook, A.L.; Kelso, A.; Macdonald, H.R.
Journal of Immunology 130(4): 1545-1551
1983
ISSN/ISBN: 0022-1767 PMID: 6187814 Document Number: 207739
Previous analyses of the inhibitory effects of anti-Lyt-2 monoclonal antibodies (mAb) on cytolytic activity suggested that Lyt-2/3 antigens expressed on the surface of murine cytolytic T lymphocytes (CTL) are involved in antigen recognition. The effects were studied of anti-Lyt-2 mAb (in the absence of complement) on the functional activities of H-2K/D-specific Lyt-2+ CTL clones that proliferate to antigenic stimulation in the absence of helper T cells or added interleukin 2 (IL 2) and secrete lymphokines. For those clones that were inhibited in cytolysis by anti-Lyt-2 mAb, a parallel inhibition of antigen-dependent proliferation and lymphokine secretion (interferon, macrophage-activating factor) was observed. Inhibition of proliferation or lymphokine secretion could be overcome by the addition of IL 2 or lectin, respectively. Anti-Lyt-2 mAb evidently were inhibiting CTL antigen recognition. Not all CTL clones were inhibited in cytolysis by anti-Lyt-2 mAb, in which case proliferation and lymphokine secretion were similarly unaffected. This heterogeneity of Lyt-2+ CTL clones in their susceptibility to inhibition of cytolytic activity, proliferation and lymphokine secretion by anti-Lyt-2 mAb is discussed in the context of a model proposing that Lyt-2/3 molecules function to stabilize the interaction btween CTL receptors and the corresponding target/stimulating cell antigens. Such a stabilization may be required by CTL possessing few and/or low affinity receptors.