Suppression of expression of endoplasmic reticulum chaperones by Helicobacter pylori and its role in exacerbation of non-steroidal anti-inflammatory drug-induced gastric lesions

Takushi Namba, Tatsuya Hoshino, Shintaro Suemasu, Mika Takarada-Iemata, Osamu Hori, Naomi Nakagata, Akinori Yanaka, Tohru Mizushima

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Both the use of non-steroidal anti-inflammatory drugs (NSAIDs), such as indomethacin, and infection with Helicobacter pylori are major causes of gastric ulcers. Although some clinical studies suggest that infection with H. pylori increases the risk of developing NSAID-induced gastric lesions, the molecular mechanism governing this effect is unknown. We recently found that in cultured gastric cells, expression of endoplasmic reticulum (ER) chaperones (such as 150-kDa oxygenregulated protein (ORP150) and glucose-regulated protein 78 (GRP78)) is induced by NSAIDs and confers protection against NSAID-induced apoptosis, which is important in the development of NSAID-induced gastric lesions. In this study we have found that co-culture of gastric cells with H. pylori suppresses the expression of ER chaperones. This suppression was regulated at the level of transcription and accompanied by a reduction in the level of activating transcription factor 6 (ATF6), one of the transcription factors for ER chaperone genes. In vivo, inoculation of mice with H. pylori suppressed the expression of ER chaperones at gastric mucosa both with and without administration of indomethacin. Inoculation with H. pylori also stimulated formation of indomethacin-induced gastric lesions and mucosal cell death. In addition, we found that heterozygous ORP150-deficient mice are sensitive to the development of indomethacin-induced gastric lesions and mucosal cell death. The results of this study suggest that H. pylori exacerbates NSAID-induced gastric lesions through suppression of expression of ER chaperones, which stimulates NSAID-induced mucosal cell death.

Original languageEnglish
Pages (from-to)37302-37313
Number of pages12
JournalJournal of Biological Chemistry
Volume285
Issue number48
DOIs
Publication statusPublished - 2010 Nov 26
Externally publishedYes

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Gastrointestinal Agents
Helicobacter pylori
Endoplasmic Reticulum
Anti-Inflammatory Agents
Indomethacin
Stomach
Pharmaceutical Preparations
Cell death
Cell Death
Activating Transcription Factor 6
Transcription
Stomach Ulcer
Coculture Techniques
Gastric Mucosa
Infection
Cultured Cells
Transcription Factors
Genes
Apoptosis

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

Suppression of expression of endoplasmic reticulum chaperones by Helicobacter pylori and its role in exacerbation of non-steroidal anti-inflammatory drug-induced gastric lesions. / Namba, Takushi; Hoshino, Tatsuya; Suemasu, Shintaro; Takarada-Iemata, Mika; Hori, Osamu; Nakagata, Naomi; Yanaka, Akinori; Mizushima, Tohru.

In: Journal of Biological Chemistry, Vol. 285, No. 48, 26.11.2010, p. 37302-37313.

Research output: Contribution to journalArticle

Namba, Takushi ; Hoshino, Tatsuya ; Suemasu, Shintaro ; Takarada-Iemata, Mika ; Hori, Osamu ; Nakagata, Naomi ; Yanaka, Akinori ; Mizushima, Tohru. / Suppression of expression of endoplasmic reticulum chaperones by Helicobacter pylori and its role in exacerbation of non-steroidal anti-inflammatory drug-induced gastric lesions. In: Journal of Biological Chemistry. 2010 ; Vol. 285, No. 48. pp. 37302-37313.
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