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  • Title: Generation of inflammatory cytokines in zymosan-induced pleurisy in rats: TNF induces IL-6 and cytokine-induced neutrophil chemoattractant (CINC) in vivo.
    Author: Utsunomiya I, Ito M, Oh-ishi S.
    Journal: Cytokine; 1998 Dec; 10(12):956-63. PubMed ID: 10049519.
    Abstract:
    Levels of inflammatory cytokines tumour necrosis factor (TNF), interleukin 1 (IL-1), IL-6, and cytokine-induced neutrophil chemoattractant (CINC), which is a member of the alpha-chemokine family in rats, were measured in the pleural exudates during zymosan-induced pleurisy to examine the relationship between the local production of cytokines and the inflammatory reaction. All four cytokine levels in the pleural exudate began to increase after 1-2 h, preceding the influx of neutrophils, and peaked after 4-5 h. Thereafter, these cytokine levels declined after 24 h, whereas the exudate volume still continued to increase and leukocyte number reached a plateau. Concomitant injection of actinomycin D (10 microg) with zymosan markedly suppressed the neutrophil infiltration, parallel with CINC production in the pleural exudate at 4 h. A transient elevation of IL-6 level, peaking at 5 h, and subsequent rise in the level of an acute-phase protein, T-kininogen, were also observed in the plasma. When recombinant human TNF-alpha (rhTNF-alpha) (20 000 U) was intrapleurally injected a rapid increase in pleural CINC level, followed by neutrophil infiltration, and a sharp rise in IL-6 level in the plasma, followed by an increase in T-kininogen, were demonstrated. These results suggest that CINC produced in the pleural exudate may participate in neutrophil infiltration, that IL-6 induced in the plasma stimulates T-kininogen production, and that endogenous TNF may be partly involved in the induction of CINC and IL-6 in this zymosan inflammation.
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