title: Visualization of non-heme ferric and ferrous iron by highly sensitive non-heme iron histochemistry in the stress-induced acute gastric lesions in the rat.
abstract: Redox-active non-heme iron catalyzes hydroxyl radical [Formula: see text] generation through Haber-Weiss reaction. Oxidative tissue damage by OH* has been suggested in the development of stress-induced gastric lesion. Using highly sensitive non-heme iron histochemistry, the perfusion-Perls and -Turnbull methods plus DAB intensification, we studied the distribution of non-heme ferric and ferrous iron (NHF[III] and NHF[II]) in the normal stomach and its changes in the acute gastric lesions induced by restraint water immersion (RWI) stress in the rat. Both NHF[III] and NHF[II] staining increased in the oncotic parietal cells located at the erosive lesion which developed on the gastric mucosal folds after 3 h RWI. It was considered that increase in non-heme iron in these cells catalyzed OH* generation under the presence of O(2)(*-) released from abundant injured mitochondria. This was supported by the increase in H(2)O(2) staining in the erosive region and the obvious reduction of the gastric lesion following administration of deferoxamine before RWI. NHF[II] was stained in the arterial endothelium in the tela submucosa of the normal gastric wall and increase in the entire gastric mucosa after 3 h RWI suggests that the changes in the vascular non-heme iron metabolism were also involved in the response of the stomach to stressful conditions.
authors.affiliation: Department of Anatomy, Hirosaki University School of Medicine, Hirosaki, 036-8562, Japan. asanoy@cc.hirosaki-u.ac.jp
authors.forename: Yoshiya
authors.initials: Y
authors.lastname: Asano
authors.forename: Reiko
authors.initials: R
authors.lastname: Meguro
authors.forename: Saori
authors.initials: S
authors.lastname: Odagiri
authors.forename: Chentai
authors.initials: C
authors.lastname: Li
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Iwatsuki
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Shoumura
mesh_terms: D000818:Animals; D005260:Female; D005290:Ferric Compounds / Q000032:analysis*; D005293:Ferritins / Q000378:metabolism; D005296:Ferrous Compounds / Q000032:analysis*; D005753:Gastric Mucosa / Q000378:metabolism* / Q000473:pathology; D051547:Heme Oxygenase-1 / Q000378:metabolism; D006651:Histocytochemistry / Q000379:methods; D006861:Hydrogen Peroxide / Q000378:metabolism; D007101:Immersion / Q000009:adverse effects; D007150:Immunohistochemistry / Q000379:methods; D019159:Nonheme Iron Proteins / Q000032:analysis; D051381:Rats; D017208:Rats, Wistar; D012149:Restraint, Physical / Q000009:adverse effects; D013276:Stomach Ulcer / Q000209:etiology / Q000378:metabolism* / Q000473:pathology; D013312:Stress, Physiological / Q000378:metabolism*
chemical_list: D005290:Ferric Compounds; D005296:Ferrous Compounds; D019159:Nonheme Iron Proteins; D005293:Ferritins; D006861:Hydrogen Peroxide; D051547:Heme Oxygenase-1