Stimulation of the Respiratory Burst of Murine Peritoneal Inflammatory Neutrophils by Conjugation with Tumor Cells1

Murine peritoneal neutrophils (PMNs), elicited by i.p. injection of formalin-killed Corynebacteria parvum, spontaneously lyse teratocarcinoma targets through the secretion of reactive oxygen intermediates. Examination of effector-target interactions at the single cell level revealed that PMNs conjugated to tumor cells were 3-fold more frequently stained by nitroblue tetrazolium compared to nonconjugating PMNs suggesting that tumor targets stimulated a potent tumor-lytic respiratory burst. This notion was confirmed by the detection of Superoxide and hydrogen peroxide generation from PMNs as well as a luminol-dependent chemiluminescent response following conjugation with viable tumor targets. Generation of Superoxide was dependent upon the presence of dihydrocytochalasin B. In addition to teratocarcinoma cells, comparable stimu lation was achieved by conjugation with YAC and P815 targets but not thymocytes. Reactive oxygen intermediate release was also achieved by mixing peritoneal PMNs with heat-killed tumor cells. In contrast to bacteria-induced effectors, PMNs elicited by i.p. injection of thioglycollate were incapable of responding following conjugation with tumor targets although they were competent for reactive oxygen intermediate release when stimulated by phorbol myristate acetate. Teratocarcinoma targets were sensitive to concentrations of H2O2 that could be achieved by PMNs following contact. These data indicate that Corynebacteriaelicited inflammatory PMNs lyse their bound tumor targets by a mech anism similar to a stimulus-secretion model.