Cytoprotective Action of L-Arginine against HCl-Induced Gastric Injury in Rats: Involvement of Nitric Oxide?
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概要
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We examined the cytoprotective effect of L-arginine on gastric damage induced by 0.6 N HC1 in rats and investigated whether the mechanism of this action is related to the nitric oxide (NO)-mediated protection. The animals were given 0.6 N HCI by gavage and killed 1 hr later. L-Arginine (100, 300 and 750 mg/kg)given p.o. 30 min before HC1 treatment prevented these lesions in a dose-dependent manner, but had no effect when given i.v. (200 mg/kg). Similar effects were observed by D-arginine but not by an equimolar dose of mannitol. This effect of L-arginine (p.o.)was attenuated significantly by prior administration of indomethacin (5 mg/kg, s.c.)but not by <I>N</I><SUP>G</SUP>-nitro-L-arginine methyl ester (L-NAME)(5 mg/kg, i.v.), the NO synthase inhibitor. Both L and D-arginine produced a reduction in potential difference (PD), inhibition of gastric motility, and increases of luminal pH and mucosal blood flow when they were given intragastrically. Indomethacin significantly mitigated these changes induced by L-arginine except PD reduction, while L-NAME showed significant inhibition only against the increased pH response. We conclude that Larginine given p.o. exhibits gastric cytoprotection against HCl-induced damage in rats, probably by acting as a mild irritant. The mechanism of this action may appear through "adaptive cytoprotection" mediated by endogenous prostaglandins and does not involve the NO-mediated protective pathway.
- 公益社団法人 日本薬理学会の論文
著者
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Okabe Susumu
Department Of Applied Pharmacology Kyoto College Of Pharmacy
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Takeuchi Koji
Department of Air Pollution Control, National Research Institute for Pollution and Resources
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Ohuchi Tomohisa
Department of Applied Pharmacology, Kyoto Pharmaceutical University
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Kato Shinichi
Department of Applied Pharmacology, Kyoto Pharmaceutical University
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