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Minimal requirements for the induction of interleukin 2 (IL-2) responsiveness in purified subsets of murine T lymphocytes have been investigated. Whereas Lyt-2+ cells could be induced to IL-2-dependent growth by lectin, phorbol ester, or calcium ionophore, none of these stimuli was by itself sufficient for L3T4+ cells. The latter cells could, however, be induced to respond to IL-2 by combinations of lectin plus phorbol ester or ionophore plus phorbol ester (but not lectin plus ionophore). Under optimal conditions, growth of L3T4+ cells (like Lyt-2+ cells) was independent of accessory cells and cell-cell contact.

Differential requirements for the induction of interleukin 2 responsiveness in L3T4+ and Lyt-2+ T cell subsets.