| Autor: |
Sobue, Masashi, Joh, Takashi, Oshima, Tadayuki, Suzuki, Hideo, Seno, Kyoji, Kasugai, Kunio, Nomura, Tomoyuki, Ohara, Hirotaka, Yokoyama, Yoshifumi, Itoh, Makoto |
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| Zdroj: |
Journal of Gastroenterology & Hepatology; Oct2003, Vol. 18 Issue 10, p1188-1195, 8p |
| Abstrakt: |
Abstract Background and Aim: It is well known that capsaicin-sensitive nerve signaling acts as a protective factor against various ulcerogens. However, the contribution of topical capsaicin-sensitive nerves within the stomach to rapid restitution has not been fully investigated. The present study was therefore conducted focusing on recovery from gastric mucosal damage induced by ethanol in vivo . Methods: Male Sprague-Dawley rats were fasted and anesthetized. [sup 51] Cr-EDTA was administered intravenously and gastric mucosal integrity was continuously monitored by measuring the blood to lumen [sup 51] Cr-EDTA clearance. Capsaicin or vehicle was irrigated before, together with or after the perfusion of 20% ethanol, followed by perfusion with saline. In another experiment, ruthenium red, a capsaicin-sensitive cation antagonist, was given before the ethanol-capsaicin perfusion. Furthermore, this study was verified using lafutidine, a histamine H[sub 2] -receptor antagonist, which has a gastric mucosal protective action through the capsaicin-sensitive afferent nerves. Results: When capsaicin was administered before ethanol treatment, mucosal damage was significantly reduced and recovery was significantly rapid compared to the control. When capsaicin (160 µM) and ethanol were administered simultaneously, the mucosal damage was exacerbated but recovery was nevertheless more rapid than the control group. With a lower dose of capsaicin (80 µM), mucosal damage was not exacerbated and recovery was enhanced. When capsaicin or lafutidine was administered after the induction of ethanol injury no change was detected regarding the damage. However, recovery was significantly accelerated. Ruthenium red reversed the action of post-treatment with capsaicin on restitution. Conclusions: These results indicate that luminal administration of capsaicin exerts protection against and accelerates restitution from gastric damage in the very early phase after ethanol injury. This action is probably due to activation of topical capsaicin-sensitive afferent nerves in the rat. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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