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Xiong Y, Qiu J, Li C, Qiu Y, Guo L, Liu Y, Wan J, Li Y, Wu G, Wang L, Zhou Z, Dong J, Du C, Chen D, Guo H. Fortunellin-Induced Modulation of Phosphatase and Tensin Homolog by MicroRNA-374a Decreases Inflammation and Maintains Intestinal Barrier Function in Colitis. Front Immunol 2018; 9:83. [PMID: 29472916 PMCID: PMC5810275 DOI: 10.3389/fimmu.2018.00083] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Accepted: 01/11/2018] [Indexed: 12/19/2022] Open
Abstract
Activation of phosphatase and tensin homolog (PTEN) is known to induce cell apoptosis. MicroRNA-374a (miR-374a), which can suppress PTEN expression, has been found abnormally expressed in inflammatory bowel disease (IBD). Fortunellin is a citrus flavonoid that is a potential anti-inflammation agent in inflammatory diseases. The present study investigated the effects and mechanisms underlying fortunellin-induced inhibition of PTEN in IBD. Colitis was established in rats by the intracolonic administration of 2,4,6-trinitrobenzene sulfonic acid to mimic human ulcerative colitis, which is the main type of IBD. miR-374a expression was measured by quantitative real-time polymerase chain reaction, and the regulation of PTEN by miR-374a was evaluated by dual luciferase reporter assay. Western blotting was used to measure the corresponding protein expression. Fortunellin ameliorated colitis symptoms, including excessive inflammation and oxidative stress. Fortunellin decreased epithelial cell apoptosis through inhibiting PTEN expression in colitis. Fortunellin-induced downregulation of PTEN could be counteracted by miR-374a depletion. Moreover, knockdown of miR-374a in vivo partly inhibited the effects of fortunellin on rat colitis. In conclusion, PTEN inhibition contributes to the amelioration effects of fortunellin on colitis. It was confirmed that fortunellin targets miR-374a, which is a negative regulator of PTEN. This study provides novel insights into the pathological mechanisms and treatment alternatives of colitis.
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Affiliation(s)
- Yongjian Xiong
- Central Laboratory, First Affiliated Hospital of Dalian Medical University, Dalian, China.,College of Integrative Medicine, Dalian Medical University, Dalian, China
| | - Juanjuan Qiu
- Central Laboratory, First Affiliated Hospital of Dalian Medical University, Dalian, China.,College of Integrative Medicine, Dalian Medical University, Dalian, China
| | - Changyi Li
- Laboratory Animal Center, Dalian Medical University, Dalian, China
| | - Yang Qiu
- Central Laboratory, First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Li Guo
- Central Laboratory, First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Yuejian Liu
- Central Laboratory, First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Jiajia Wan
- Central Laboratory, First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Yuchun Li
- Central Laboratory, First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Guokai Wu
- Central Laboratory, First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Liang Wang
- Laboratory Animal Center, Dalian Medical University, Dalian, China
| | - Zijuan Zhou
- Laboratory Animal Center, Dalian Medical University, Dalian, China
| | - Jianyi Dong
- Laboratory Animal Center, Dalian Medical University, Dalian, China
| | - Chunhua Du
- Division of Gastroenterology, Dalian 3rd People's Hospital, Dalian, China
| | - Dapeng Chen
- Laboratory Animal Center, Dalian Medical University, Dalian, China
| | - Huishu Guo
- First Affiliated Hospital of Dalian Medical University, Dalian, China
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