Effect of respiratory syncytial virus-antibody complexes on cytokine (IL-8, IL-6, TNF-alpha) release and respiratory burst in human granulocytes.
The release of interleukin-8 (IL-8), IL-6, and tumour necrosis factor-alpha (TNF-alpha) from human polymorphonuclear granulocytes (PMN) after exposure to infectious respiratory syncytial virus (RSV) particles was investigated. Our data showed that PMN secreted IL-8 and IL-6 in a time- and RSV-dose-dependent manner. During the RSV exposure, TNF-alpha was not detected in the cell supernatant of PMN. Similar amounts of IL-8 were secreted after either incubation with infectious or UV-inactivated RSV particles. Obviously, PMN bind and phagocytose the viral particles, which leads to the secretion of cytokines. The increased IL-8 secretion was accompanied with an enhanced cytoplasmic IL-8 mRNA steady state level, as shown by Northern blot analysis. The IL-8 secretion pattern from PMN was also studied after its interaction with RSV--antibody complexes. Non-neutralizing monoclonal antibodies (mAb) directed to the RSV fusion protein and glycoprotein were used to generate immune complexes. Only the mAb directed to the RSV fusion protein enhanced the IL-8 release from PMN significantly. In addition, the chemiluminescence response from PMN was analysed after exposure of the cells to RSV particles, RSV-mAb complexes, Ca-ionophore A23187 or N-formyl-methionyl-leucyl-phenylalanine (FMLP). The phagocytosis of RSV inhibited the oxygen radical production induced by the Ca-ionophore A23187 or FMLP. Only RSV-anti-fusion protein mAb complexes generated a chemiluminescence response from PMN. Thus, PMN play an important role in the control of RSV infection.
Arnold
R
R
Department of Medical Microbiology, Ruhr-Universität Bochum, Germany.
Werner
F
F
Humbert
B
B
Werchau
H
H
König
W
W
D000936:Antigen-Antibody Complex / Q000276:immunology; D002478:Cells, Cultured; D016207:Cytokines / Q000378:metabolism*; D006801:Humans; D015850:Interleukin-6 / Q000378:metabolism; D016209:Interleukin-8 / Q000235:genetics / Q000378:metabolism; D008163:Luminescent Measurements; D009504:Neutrophils / Q000276:immunology*; D010587:Phagocytosis / Q000276:immunology; D012333:RNA, Messenger / Q000032:analysis; D016897:Respiratory Burst / Q000276:immunology*; D018113:Respiratory Syncytial Virus, Human / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
D000936:Antigen-Antibody Complex; D016207:Cytokines; D015850:Interleukin-6; D016209:Interleukin-8; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha