title: In vitro effect of dexamethasone, pentoxifylline, and anti-endotoxin monoclonal antibody on the release of proinflammatory mediators by human leukocytes stimulated with Haemophilus influenzae type B.
abstract: The effects of dexamethasone, pentoxifylline, and MAb against endotoxin (HA-1A) on the release of various proinflammatory mediators, i.e. tumor necrosis factor-alpha (TNF), IL-1 beta, IL-8, and prostaglandin 2, by human leukocytes during stimulation with Haemophilus influenzae type B were studied. The results show that only monocytes, and thus neither lymphocytes nor granulocytes, release these mediators in response to H. influenzae. Dexamethasone inhibited the release of all of these mediators, whereas pentoxifylline only inhibited the release of TNF. HA-1A only reduced the release of IL-8 from adherent monocytes significantly and had no significant effect on the release of TNF, IL-1 beta, and prostaglandin E2. In whole blood, no significant effect of HA-1A on the release of TNF, IL-1 beta, IL-8, and prostaglandin E2 was found. In summary, the results of this study demonstrate that dexamethasone is the most potent inhibitor of the release of proinflammatory mediators by monocytes induced by H. influenzae type B.
authors.affiliation: Department of Infectious Diseases, University Hospital, Leiden, The Netherlands.
authors.forename: A M
authors.initials: AM
authors.lastname: van Furth
authors.forename: T M
authors.initials: TM
authors.lastname: Steenwijk
authors.forename: J A
authors.initials: JA
authors.lastname: Langermans
authors.forename: R
authors.initials: R
authors.lastname: van Furth
mesh_terms: D000911:Antibodies, Monoclonal / Q000494:pharmacology; D016207:Cytokines / Q000378:metabolism*; D003907:Dexamethasone / Q000494:pharmacology*; D015232:Dinoprostone / Q000378:metabolism; D004731:Endotoxins / Q000037:antagonists & inhibitors* / Q000276:immunology; D006193:Haemophilus influenzae / Q000472:pathogenicity*; D006801:Humans; D066298:In Vitro Techniques; D007375:Interleukin-1 / Q000378:metabolism; D016209:Interleukin-8 / Q000378:metabolism; D007962:Leukocytes / Q000187:drug effects / Q000378:metabolism; D008583:Meningitis, Haemophilus / Q000188:drug therapy / Q000628:therapy; D009000:Monocytes / Q000187:drug effects / Q000378:metabolism; D010431:Pentoxifylline / Q000494:pharmacology*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D016207:Cytokines; D004731:Endotoxins; D007375:Interleukin-1; D016209:Interleukin-8; D014409:Tumor Necrosis Factor-alpha; D003907:Dexamethasone; D015232:Dinoprostone; D010431:Pentoxifylline