title: Heme oxygenase-1 participates in the anti-inflammatory activity of taurine chloramine.
abstract: Interleukin-6 (IL-6) and interleukin-8 (IL-8) are implicated in the pathogenesis of rheumatic diseases. In affected joints fibroblast-like synoviocytes (FLS) are the major source of these pro-inflammatory cytokines. We have previously found that production of both cytokines is inhibited in vitro by taurine chloramine (Tau-Cl). Heme oxygenase (HO-1) activity was also reported to restrict synthesis of various inflammatory mediators, including IL-6 and IL-8. The aim of present study was to investigate whether this enzyme activity is implicated in the mechanism of Tau-Cl suppressive effect. We have shown that in rheumatoid FLS both hemin (known HO-1 inducer) and Tau-Cl significantly up-regulate HO-1 expression at the mRNA and protein levels and simultaneously inhibit IL-1 beta-triggered production of pro-inflammatory cytokines. However, the inhibitory potency of these compounds differs, because hemin is more potent inhibitor of IL-8 than IL-6 production, while Tau-Cl exerts opposite effect. Importantly, pretreatment of the cells with HO-1 inhibitor completely reverses the inhibitory effect of hemin on both cytokines production. However, in Tau-Cl treated cells this inhibitor fully restores only IL-8 secretion but has weaker effect on IL-6 response. Thus, the present results: (i) support HO-1 activity to be relevant to negatively control production of pro-inflammatory cytokines, and (ii) underline implication of HO-1 in mediating Tau-Cl inhibitory action.
authors.affiliation: Department of Pathophysiology and Immunology, Institute of Rheumatology, Warsaw, Poland.
authors.forename: B
authors.initials: B
authors.lastname: Muz
authors.forename: E
authors.initials: E
authors.lastname: Kontny
authors.forename: J
authors.initials: J
authors.lastname: Marcinkiewicz
authors.forename: W
authors.initials: W
authors.lastname: Maśliński
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D001172:Arthritis, Rheumatoid / Q000201:enzymology* / Q000276:immunology / Q000473:pathology; D015153:Blotting, Western; D002478:Cells, Cultured; D016207:Cytokines / Q000187:drug effects / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005260:Female; D020869:Gene Expression Profiling; D051547:Heme Oxygenase-1 / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000502:physiology*; D006427:Hemin / Q000494:pharmacology; D006801:Humans; D008297:Male; D008875:Middle Aged; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012720:Severity of Illness Index; D013329:Structure-Activity Relationship; D013654:Taurine / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D016207:Cytokines; D013654:Taurine; C043410:N-chlorotaurine; D006427:Hemin; D051547:Heme Oxygenase-1