title: Modulation by heme and zinc protoporphyrin of colonic heme oxygenase-1 and experimental inflammatory bowel disease in the rat.
abstract: Reactive oxygen species, suggested to be involved in inflammatory bowel disease, may be modulated by endogenous anti-oxidant products of heme oxygenase-1 (HO-1). In the present work, HO-1 expression in trinitrobenzene sulphonic acid (TNBS)-induced colitis in the rat and the effects of HO-1 modulation, particularly by the HO-1 inducer, heme, were further evaluated. Colitis was induced by intracolonic challenge with TNBS and assessed macroscopically and by myeloperoxidase (MPO) assay. Heme oxygenase activity was determined by measurement of bilirubin formation and HO-1 protein expression was determined by Western blotting. TNBS challenge led to an early and substantial induction of HO-1 protein expression and heme oxygenase activity in the colon that peaked after 48-72 h and declined over 10 days. Heme (30 micromol/kg/day, s.c) increased colonic HO-1 protein expression and enzyme activity and decreased colonic damage and myeloperoxidase activity. Short-term administration of cadmium chloride (2 mg/kg, s.c.), another known HO-1 inducer, also reduced the colonic injury and myeloperoxidase levels. In contrast, the HO-1 inhibitor, zinc protoporphyrin (50 micromol/kg/day, s.c) significantly increased the colonic damage and myeloperoxidase activity over 10 days, as did tin protoporphyrin (30 micromol/kg/day, s.c). These results support the proposal that induction of HO-1 provides a protective mechanism in this model under both acute and more-chronic conditions, and that its selective up-regulation could thus be of therapeutic potential in colitis.
authors.affiliation: Department Comparative Physiology, Faculty of Sciences, University Szeged, Szeged, Hungary. vacs@bio.u-szeged.hu
authors.forename: Csaba
authors.initials: C
authors.lastname: Varga
authors.forename: Ferenc
authors.initials: F
authors.lastname: Laszlo
authors.forename: Peter
authors.initials: P
authors.lastname: Fritz
authors.forename: Maryan
authors.initials: M
authors.lastname: Cavicchi
authors.forename: Dominique
authors.initials: D
authors.lastname: Lamarque
authors.forename: Krisztina
authors.initials: K
authors.lastname: Horvath
authors.forename: Aniko
authors.initials: A
authors.lastname: Posa
authors.forename: Aniko
authors.initials: A
authors.lastname: Berko
authors.forename: Brendan J R
authors.initials: BJ
authors.lastname: Whittle
mesh_terms: D000818:Animals; D001663:Bilirubin / Q000096:biosynthesis; D015153:Blotting, Western; D019256:Cadmium Chloride / Q000494:pharmacology; D003093:Colitis, Ulcerative / Q000139:chemically induced / Q000188:drug therapy / Q000201:enzymology*; D004195:Disease Models, Animal; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D006418:Heme / Q000494:pharmacology*; D051547:Heme Oxygenase-1 / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D008665:Metalloporphyrins / Q000494:pharmacology; D009195:Peroxidase / Q000378:metabolism; D011524:Protoporphyrins / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D004791:Enzyme Inhibitors; D008665:Metalloporphyrins; D011524:Protoporphyrins; C017803:zinc protoporphyrin; D006418:Heme; C032628:tin protoporphyrin IX; D009195:Peroxidase; D051547:Heme Oxygenase-1; D019256:Cadmium Chloride; D001663:Bilirubin