期刊
GASTROENTEROLOGY
卷 142, 期 2, 页码 292-304出版社
W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1053/j.gastro.2011.10.040
关键词
Claudin; Gene Knockout; Tight Junction; Gastritis
资金
- Ministry of Education, Science and Culture of Japan
- Grants-in-Aid for Scientific Research [19GS0313, 23659172, 23590334] Funding Source: KAKEN
BACKGROUND & AIMS: Although defects in tight junction (TJ) epithelial paracellular barrier function are believed to be a primary cause of inflammation, the mechanisms responsible remain largely unknown. METHODS: We generated knockout mice of stomach-type claudin-18, a major component of TJs in the stomach. RESULTS: Cldn18(-/-) mice were afflicted with atrophic gastritis that started on postnatal day 3. This coincided with a decrease in intragastric pH due to H+ secretion from parietal cells and concomitant up-regulation of the cytokines, interleukin-1 beta, cyclooxygenase-2, and KC, resulting in spasmolytic polypeptide-expressing metaplasia (SPEM). Oral administration of hydrochloric acid on postnatal day 1 induced the expression of these cytokines in Cldn18(-/-) infant stomach, but not in Cldn18(+/+) mice. A paracellular H+ leak in Cldn18(-/-) stomach was detected by electrophysiology and H+ titration, and freeze-fracture electron microscopy showed structural defects in the TJs, in which the tightly packed claudin-18 (stomach-type)-based TJ strands were lost, leaving a loose meshwork of strands consisting of other claudin species. CONCLUSIONS: These findings provide evidence that claudin-18 normally forms a paracellular barrier against H+ in the stomach and that its deficiency causes paracellular H+ leak, a persistent up-regulation of proinflammatory cytokines, chronic recruitment of neutrophils, and the subsequent development of SPEM in atrophic gastritis.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据