title: Differential effect of anti-TNF-alpha antibody on proinflammatory cytokine release by Kupffer cells following liver ischemia and reperfusion.
abstract: To study the role of tumor necrosis factor-alpha (TNF-alpha) for induction of the proinflammatory cytokine cascade after liver ischemia and reperfusion (I/R), rats were injected intraperitoneally with anti-TNF-alpha monoclonal antibodies (mAb) or placebo (IgG1) 30 min prior to global hepatic ischemia. Blood levels of TNF-alpha, interleukin (IL)-1alpha and -6 were determined. In addition, Kupffer cells (KC) were harvested after 60 min of reperfusion and spontaneous cytokine release was measured. Sham-operated animals were used as controls. Levels of proinflammatory cytokines in serum and KC supernatants were detected using specific bioassays and ELISA. Liver I/R resulted in increased (p < .01) serum levels of TNF-alpha, IL-1alpha, and IL-6, which was associated with an enhanced (p < .05) release of these cytokines by KC. In vivo pretreatment with anti-TNF-alpha mAb led to complete neutralization of TNF-alpha serum levels and decreased (p < .01) IL-6 levels (-62%). Moreover, anti-TNF-alpha mAb markedly (p < .05) decreased the release of TNF-alpha (-69%) and IL-6 (-56%) by KC, while IL-1alpha was not affected. These data indicate that TNF-alpha produced early after liver I/R triggers both its own secretion as well as IL-6 release by KC during reperfusion while the release of IL-1alpha occurs independent from TNF-alpha.
authors.affiliation: Institute for Surgical Research, University Hospital Grosshadern, Ludwig-Maximillians-University Munich, Germany.
authors.forename: G A
authors.initials: GA
authors.lastname: Wanner
authors.forename: P E
authors.initials: PE
authors.lastname: Müller
authors.forename: W
authors.initials: W
authors.lastname: Ertel
authors.forename: M
authors.initials: M
authors.lastname: Bauer
authors.forename: M D
authors.initials: MD
authors.lastname: Menger
authors.forename: K
authors.initials: K
authors.lastname: Messmer
mesh_terms: D000818:Animals; D000906:Antibodies / Q000276:immunology* / Q000494:pharmacology; D016207:Cytokines / Q000187:drug effects / Q000378:metabolism*; D007249:Inflammation / Q000378:metabolism; D007375:Interleukin-1 / Q000378:metabolism; D015850:Interleukin-6 / Q000378:metabolism; D007511:Ischemia / Q000378:metabolism; D007728:Kupffer Cells / Q000187:drug effects / Q000378:metabolism*; D008099:Liver / Q000098:blood supply*; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D015424:Reperfusion; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology*
chemical_list: D000906:Antibodies; D016207:Cytokines; D007375:Interleukin-1; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha