Calcium ionophore plus phorbol ester can substitute for antigen in the induction of cytolytic T lymphocytes from specifically primed precursors.
Previous studies indicated that Ca++ ionophores and phorbol esters in synergy could substitute for the initial activation step of normal T lymphocytes or T cell clones leading to increased expression of receptors for the growth factor interleukin 2 (IL 2) and secretion of interleukins, with the mitogenic signal for T cell proliferation being dependent on the presence of IL 2. In this study, the question was addressed as to whether T lymphocytes activated through the Ca++ ionophore ionomycin and the phorbol ester 12-o-tetradecanoyl phorbol 3-acetate (TPA) also acquired the competence to kill relevant target cells. The results indicate that T lymphocytes from primed mice proliferate and lyse the relevant allogeneic target cells after in vitro stimulation with ionomycin plus TPA, and that T lymphocyte preparations enriched for a subpopulation bearing the Lyt-2 marker are dependent on exogeneous sources of IL 2 to proliferate and become competent killer cells, whereas preparations enriched for subpopulations bearing the L3T4 marker grow independently of exogenous IL 2.
A
A
Truneh
F
F
Albert
P
P
Golstein
A M
AM
Schmitt-Verhulst
D000818:Animals; D000941:Antigens / Q000276:immunology*; D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D000954:Antigens, Surface; D002469:Cell Separation; D003602:Cytotoxicity, Immunologic / Q000187:drug effects; D000939:Epitopes; D004987:Ethers / Q000494:pharmacology; D015759:Ionomycin; D007476:Ionophores / Q000494:pharmacology*; D008213:Lymphocyte Activation / Q000187:drug effects*; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D010704:Phorbols / Q000494:pharmacology*; D013234:Stem Cells / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*
D000941:Antigens; D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D000954:Antigens, Surface; D000939:Epitopes; D004987:Ethers; D007476:Ionophores; D010704:Phorbols; D015759:Ionomycin; D013755:Tetradecanoylphorbol Acetate