title: Activation of neutrophilic granulocytes by products of human lymphocytes.
abstract: Materials produced by stimulated primary cultures of human lymphocytes and by a continuous human lymphoid cell line, RPMI 1788, were tested for granulocyte phagocytosis promoting activity. Blood lymphocytes of healthy donors were stimulated with tuberculin (PPD) or concanavalin A (con A) and the culture fluids collected after 3 days of in vitro incubation. Fluids of the lymphoid cell line were collected from 2-day-old cultures. All three kinds of preparations were found to induce a significant increase in neutrophilic granulocyte phagocytic activity. Studies on the kinetics of granulocyte activation revealed that it is a relatively rapid process, being maximal within 60-120 min. This is in contrast to the considerably slower activation of monocytes in a comparable system. Intracutaneous inoculation of the active materials in human volunteers resulted in reactions that grossly and histologically resembled accelerated delayed type hypersensitivity reactions.
mesh_terms: D006098:Granulocytes; D006801:Humans; D007962:Leukocytes; D008213:Lymphocyte Activation; D008222:Lymphokines / Q000494:pharmacology*; D009504:Neutrophils; D010587:Phagocytosis; D012882:Skin Tests
chemical_list: D008222:Lymphokines