徳島大学 教育・研究者情報データベース(EDB)

1. (英) Tentaku Aya / (日) 天宅 あや / (読) てんたく あや

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2. 下畑 隆明

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3. (英) Hatayama Sho / (日) 畑山 翔 / (読) はたやま しょう

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4. (英) Kido Junko / (日) 木戸 純子 / (読) きど じゅんこ

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5. (英) Nguyen Anh Quoc / (日) Nguyen Anh Quoc / (読) ぐえん くぉ あいん

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6. (英) Kanda Yuna / (日) 神田 結奈 / (読) かんだ ゆうな

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7. (英) Fukushima Shiho / (日) 福島 志帆 / (読) ふくしま しほ

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8. 上番増 喬([徳島大学.大学院医歯薬学研究部.医学域.先端栄養学教育研究プロジェクト]/[徳島大学.大学院医歯薬学研究部.医学域.栄養科学部門.医科栄養学系.予防環境栄養学])

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9. (英) Iwata Taketoshi

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10. 馬渡 一諭

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11. 原田 永勝

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12. 髙橋 章([徳島大学.大学院医歯薬学研究部.医学域.栄養科学部門.医科栄養学系.予防環境栄養学])

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(英) Host cellular unfolded protein response signaling regulates Campylobacter jejuni invasion.

(英) Campylobacter jejuni is a major cause of bacterial foodborne illness in humans worldwide. Bacterial entry into a host eukaryotic cell involves the initial steps of adherence and invasion, which generally activate several cell-signaling pathways that induce the activation of innate defense systems, which leads to the release of proinflammatory cytokines and induction of apoptosis. Recent studies have reported that the unfolded protein response (UPR), a system to clear unfolded proteins from the endoplasmic reticulum (ER), also participates in the activation of cellular defense mechanisms in response to bacterial infection. However, no study has yet investigated the role of UPR in C. jejuni infection. Hence, the aim of this study was to deduce the role of UPR signaling via induction of ER stress in the process of C. jejuni infection. The results suggest that C. jejuni infection suppresses global protein translation. Also, 12 h of C. jejuni infection induced activation of the eIF2α pathway and expression of the transcription factor CHOP. Interestingly, bacterial invasion was facilitated by knockdown of UPR-associated signaling factors and treatment with the ER stress inducers, thapsigargin and tunicamycin, decreased the invasive ability of C. jejuni. An investigation into the mechanism of UPR-mediated inhibition of C. jejuni invasion showed that UPR signaling did not affect bacterial adhesion to or survival in the host cells. Further, Salmonella Enteritidis or FITC-dextran intake were not regulated by UPR signaling. These results indicated that the effect of UPR on intracellular intake was specifically found in C. jejuni infection. These findings are the first to describe the role of UPR in C. jejuni infection and revealed the participation of a new signaling pathway in C. jejuni invasion. UPR signaling is involved in defense against the early step of C. jejuni invasion and thus presents a potential therapeutic target for the treatment of C. jejuni infection.

1. (英) Caco-2 Cells
2. (英) Campylobacter jejuni
3. (英) Endoplasmic Reticulum Stress
4. (英) Thapsigargin
5. (英) Transcription Factor CHOP
6. (英) Tunicamycin
7. (英) Unfolded Protein Response

1. 下畑 隆明

1. (英) PublicationType: Journal Article

2. (英) PublicationType: Research Support, Non-U.S. Gov't