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The Journal of Immunology, Vol 128, Issue 2 563-567, Copyright © 1982 by American Association of Immunologists

ARTICLES

Lysosomal enzyme release from human monocytes in response to particulate stimuli

PJ Keeling and PM Henson

Lysosomal enzyme release from human monocytes was evaluated in response to opsonized zymosan, opsonized sheep erythrocytes, and latex beads. Monocytes were found to release lysosomal enzymes immediately upon challenge with all three phagocytosable particles. Cytochalasin B enhanced beta-glucosaminidase release from mononuclear cells challenged with opsonized zymosan or opsonized red blood cells, but inhibited the response to latex particles. Lysosomal enzyme release was found to be independent of protein synthesis, and in the absence of cytochalasin B required the stimulus to be presented either as a phagocytosable particle or immobilized on a surface. The kinetics of enzyme release and phagocytosis were also examined and found to be different, lending support to the hypothesis that lysosomal enzyme release may be a physiologic response to a biologic stimulus in vivo and not simply an "accidental" consequence of an ongoing phagocytic event.


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