https://doi.org/10.4081/ejh.2022.3415

Endoplasmic reticulum stress contributed to inflammatory bowel disease by activating p38 MAPK pathway

Vol. 66 No. 2 (2022)
Submitted: 4 April 2022
Accepted: 16 May 2022
Published: 23 May 2022
inflammatory bowel disease, endoplasmic reticulum stress, IL-8, p38 MAPK
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Authors

Yan Long
Department of Digestive Diseases, Changsha Central Hospital, Changsha, China.
Yan Zhao
Department of Pathology, Changsha Central Hospital, Changsha, China.
Xiaoqing Ma
Zhongshan City People Hospital, Zhongshan, Guangdong, China.
Ya Zeng
Department of Digestive Diseases, Changsha Central Hospital, Changsha, China.
Tian Hu
Department of Digestive Diseases, Changsha Central Hospital, Changsha, China.
Weijie Wu
Department of Digestive Diseases, Changsha Central Hospital, Changsha, China.
Chongtian Deng
Department of Digestive Diseases, Changsha Central Hospital, Changsha, China.
Jinyue Hu
Central Laboratory, Changsha Central Hospital, Changsha, China.
Yueming Shen
2018050504@usc.edu.cn
Department of Digestive Diseases, Changsha Central Hospital, Changsha, China.

Recent evidence suggests that endoplasmic reticulum (ER) stress plays a vital role in inflammatory bowel disease (IBD). Therefore, the aim of this study was to investigate the mechanism by which ER stress promotes inflammatory response in IBD. The expression of Gro-α, IL-8 and ER stress indicator Grp78 in colon tissues from patients with Crohn’s disease (CD) and colonic carcinoma was analyzed by immunohistochemistry staining. Colitis mouse model was established by the induction of trinitrobenzene sulphonic acid (TNBS), and the mice were treated with ER stress inhibitor tauroursodeoxycholic acid (TUDCA). Then the body weight, colon length and colon inflammation were evaluated, and Grp78 and Gro-α in colon tissues were detected by immunohistochemistry. Epithelial cells of colon cancer HCT116 cells were treated with tunicamycin to induce ER stress. Grp78 was detected by Western blot, and chemokines were measured by PCR and ELISA. The expression levels of Grp78, Gro-α and IL-8 were significantly upregulated in intestinal tissues of CD patients. Mice with TNBS induced colitis had increased expression of Grp78 and Gro-α in colonic epithelia. TUDCA reduced the severity of TNBS-induced colitis. In HCT116 cells, tunicamycin increased the expression of Grp78, Gro-α and IL-8 in a concentration-dependent manner. Furthermore, p38 MAPK inhibitor significantly inhibited the upregulation of Gro-α and IL-8 induced by tunicamycin. In conclusion, ER stress promotes inflammatory response in IBD, and the effects may be mediated by the activation of p38 MAPK signaling pathway.

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Ethics Approval

All animal experiments were reviewed and approved by the Institutional Animal Care Committee of Changsha Central Hospital (Approval No. 20200512)

Rights

Natural Science foundation of Hunan Province of China (No. 2019JJ40319), Project of Hunan Province, Department of Health (No. B2019142), Project of Changsha Science and Technology Bureau (No. kq2004167), and Hunan Science and Technology Innovation Plan Project (No. 2020SK53306)

How to Cite

Long, Y., Zhao, Y., Ma, X., Zeng, Y., Hu, T., Wu, W., Deng, C., Hu, J., & Shen, Y. (2022). Endoplasmic reticulum stress contributed to inflammatory bowel disease by activating p38 MAPK pathway. European Journal of Histochemistry, 66(2). https://doi.org/10.4081/ejh.2022.3415
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