Enhancement of Polymorphonuclear Leukocyte-mediated Tumor Cytotoxicity by Serum Factor(s)

Lung cell oxidant injury. Enhancement of polymorphonuclear leukocyte-mediated cytotoxicity in lung cells exposed to sustained in vitro hyperoxia.

The oxidant damage of lung tissue during in vivo hyperoxic exposure appears to be amplified by neutrophils that release toxic amounts of oxygen metabolites. In our studies cloned lung epithelial cells (L2 cells), lung fibroblasts, and pulmonary artery endothelial cells were cultured under either ambient (Po(2) approximately 140 torr) or hyperoxic (Po(2) approximately 630 torr) conditions for 48...

Intravital Förster resonance energy transfer imaging reveals osteopontin‐mediated polymorphonuclear leukocyte activation by tumor cell emboli

Myeloid-derived suppressor cells (MDSCs) cause paraneoplastic leukemoid reactions and facilitate tumor cell metastasis. However, the interaction of MDSCs with tumor cells in live tissue has not been adequately visualized. To accomplish this task, we developed an intravital imaging protocol to observe metastasized tumor cells in mouse lungs. For visualization of the activation of MDSCs, bone mar...

Serum inhibitor of C5 fragment-mediated polymorphonuclear leukocyte chemotaxis associated with chronic hemodialysis.

Abnormal granulocyte chemotaxis has been described in chronic hemodialysis patients. In this study, sera from 53 hemodialysis patients were tested for chemotactic inhibitory activity by a modified Boyden technique. Chemotactic inhibitory activity, defined as >20% inhibition of normal granulocyte chemotaxis, was found in 45% of patients. Only sera from patients having undergone >3 mo hemodialysi...

Modulation of polymorphonuclear leukocyte function by cetiedil.

Cetiedil citrate monohydrate inhibits sickling of red cells and aggregation of platelets. We assessed its ability to attenuate polymorphonuclear leukocyte (PMN) function. PMN aggregation in response to 2 X 10(-7) M formyl-met-leu-phe (FMLP) was inhibited in a dose-dependent fashion by cetiedil concentrations ranging from 60 to 250 microM. Additionally, 125 microM cetiedil inhibited PMN aggregat...

Antibody-Mediated, FcR-Dependent Enhancement of Cytotoxicity