Neutrophil-derived hydroxyl radicals mediate interleukin-8-induced increases in tetragastrin-stimulated acid secretion in rats.
Until recently, the secretion of gastric acid, which plays an important role in the pathogenesis of peptic ulcer, was thought to be controlled by diet, the autonomic nerves and gut hormones. However, peptic ulcer is now known to be caused by the infection with Helicobacter pylori (H. pylori), so it is possible that inflammation modifies the secretion of gastric acid. We used gastric-lumen-perfused rats to first examine the effect of interleukin-8 (IL-8) on acid secretion and then the involvement of free radicals and neutrophils in the action of IL-8. IL-8 enhanced tetragastrin-stimulated acid secretion and free radical scavengers or inhibitors and the pretreatment with anti-rat neutrophil serum inhibited this effect, which indicates that IL-8 enhances gastrin-stimulated acid secretion and that neutrophil-derived hydroxyl radicals mediate the IL-8-induced increase in acid secretion.
Yakabi
Koji
K
Third Department of Internal Medicine, Teikyo University School of Medicine, 3426-3 Anesaki, Ichihara-city, Chiba, Japan 299-0111.
Mimura
Harumi
H
Iwabuchi
Hitoshi
H
Ro
Shoki
S
Kamiichi
Hideo
H
Miura
Seiichi
S
Nakamura
Takashi
T
D000493:Allopurinol / Q000494:pharmacology; D000818:Animals; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D005744:Gastric Acid / Q000378:metabolism*; D017665:Hydroxyl Radical / Q000494:pharmacology*; D016209:Interleukin-8 / Q000494:pharmacology*; D008297:Male; D009504:Neutrophils / Q000378:metabolism*; D016877:Oxidants / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D013482:Superoxide Dismutase / Q000494:pharmacology; D013758:Tetragastrin / Q000494:pharmacology*
D016209:Interleukin-8; D016877:Oxidants; D013758:Tetragastrin; D017665:Hydroxyl Radical; D000493:Allopurinol; D013482:Superoxide Dismutase; D004121:Dimethyl Sulfoxide