Effects of various human interleukin-2 preparations and lymphokine-activated killer cells on the production of antibodies in micein vivo and of human immunoglobulinsin vitro

Comparison of the lymphocytic IL-2 (lIL-2, lymphokinin) and recombinant IL-2 (rIL-2) showed that lIL-2 is characterized by a more pronounced stimulating effect of low doses on antibody production in mice and on human immunoglobulin production. High doses of lIL-2, in contrast to rIL-2, do not cause hyperstimulation of antibody production or immunoglobulin production. Human lymphokine-activated killer (LAK) cells, induced by rIL-2in vitro during 7 but not 3 days, enhance the production of human immunoglobulins. Monocytes activated by rIL-2 suppress the stimulating effect of LAK cells on immunoglobulin production.