Chemical inhibitors of TNF signal transduction in human neutrophils point to distinct steps in cell activation.
Chemical screening identified three small compounds that selectively inhibited activation of the respiratory burst (RB) of human neutrophils in response to tumor necrosis factor (TNF) and formylated peptide but not phorbol ester and spared the ability of neutrophils to kill bacteria. These compounds partially inhibited TNF-triggered cytoskeletal rearrangements without blocking adhesion or transmigation of polymorphonuclear neutrophils through TNF-activated monolayers of endothelial cells. The compounds were nontoxic to neutrophils and endothelial cells. They had no direct inhibitory effect on the tyrosine kinases Src, Syk, or Pyk2. However, their differential effects on cell spreading, bacteria-induced RB, TNF-induced degranulation, TNF-induced protein tyrosine phosphorylation, and TNF-induced Syk activation suggested that each may act on different elements of neutrophil signaling pathways.
Han
Hyunsil
H
Department of Microbiology and Immunobiology, Weill Medical College of Cornell University, New York, New York, USA.
Roberts
Julia
J
Lou
Olivia
O
Muller
Willam A
WA
Nathan
Noah
N
Nathan
Carl
C
D001419:Bacteria / Q000254:growth & development / Q000276:immunology; D002448:Cell Adhesion / Q000187:drug effects / Q000276:immunology; D015550:Cell Degranulation / Q000187:drug effects / Q000276:immunology; D002465:Cell Movement / Q000187:drug effects* / Q000276:immunology; D002478:Cells, Cultured; D015169:Colony Count, Microbial; D003599:Cytoskeleton / Q000187:drug effects / Q000276:immunology; D042783:Endothelial Cells / Q000166:cytology / Q000276:immunology; D006571:Heterocyclic Compounds / Q000494:pharmacology*; D006801:Humans; D009504:Neutrophils / Q000166:cytology / Q000276:immunology*; D010455:Peptides / Q000494:pharmacology; D011505:Protein-Tyrosine Kinases / Q000276:immunology; D016897:Respiratory Burst / Q000187:drug effects* / Q000276:immunology; D015398:Signal Transduction / Q000187:drug effects* / Q000276:immunology; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors* / Q000276:immunology / Q000494:pharmacology
D006571:Heterocyclic Compounds; D010455:Peptides; D014409:Tumor Necrosis Factor-alpha; D011505:Protein-Tyrosine Kinases