Endothelin-1-dependent leptin induction in gastric mucosal inflammatory responses to Helicobacter pylori lipopolysaccharide
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- 作者：Bronislaw L. Slomiany and Amalia Slomiany
- 关键词：Helicobacter pylori LPS ; Acute gastritis ; Leptin ; ET-1 ; ET
- 刊名：Biochemical and Biophysical Research Communications
- 出版年：2005
- 出版时间：2005
- 年：2005
- 卷：336
- 期：4
- 页码：1106-1111
- 全文大小：183 K
文摘
Leptin, a multifunctional hormone that regulates food intake and energy expenditure, has emerged recently as an important modulator of gastric mucosal responses to Helicobacter pylori infection. We applied the animal model of H. pylori LPS-induced gastritis to investigate the role of endothelin-1 (ET-1) in the mucosal leptin production. We show that the histologic pattern of inflammation reached a maximum on the fourth day following the LPS and was reflected in a marked increase in the mucosal level of ET-1 and leptin. Therapeutic administration of phosphoramidon, an inhibitor of ECE-1 activity, led to a 61.2 % decline in the mucosal ET-1 level and a 64.1 % reduction in leptin, while the severity of mucosal inflammatory involvement increased by 28.6 % . A drop in the level of leptin and the increase in severity of the inflammatory involvement elicited by the LPS was also attained in the presence of ETub>A ub> receptor antagonist BQ610, but not the ETub>B ub> receptor antagonist BQ788. Moreover, administration of ERK inhibitor, PD98059, in the presence of ETub>B ub> receptor antagonist, but not the ETub>A ub> receptor antagonist, caused reduction in the mucosal leptin level. Our findings are the first to implicate ET-1 as a key factor in up-regulation of gastric mucosal leptin-associated H. pylori infection. We also show that the effect of ET-1 on leptin production is a consequence of ETub>A ub> receptor activation.