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Deletion of miR-150 Prevents Spontaneous T Cell Proliferation and the Development of Colitis
Sayaka Ishihara1,2, Masashi Sato3, Haruka Miyazaki1
1Department of Biosciences, School of Science, Kitasato University, Sagamihara, Kanagawa, Japan.
Background And Aims:
To examine the roles of microRNAs in the development of colitis, we conducted the RNA-sequencing studies using RNA derived from normal and colitogenic CD4+ T cells. Colitogenic CD4+ T cells demonstrated the increased expression of miR-150. We focused on the involvement of miR-150 in the colitis.
Methods:
We crossed miR-150 knockout mice and T-cell-specific Rap1KO mice, which is colitis model mice and spontaneously develop the colitis with tubular adenomas in microbiota-dependent manner.
Results:
MiR-150 silencing completely inhibited the expansion of pathogenic Th17 cells and the development of colitis.
Conclusion:
MiR-150 is a potential therapeutic target of inflammatory bowel diseases.
Insights
MicroRNA-150 (miR-150) promotes colitis by increasing pathogenic T helper 17 cells. Inhibiting miR-150 effectively prevents colitis development, highlighting its therapeutic potential for inflammatory bowel diseases.
Area of Science:
- Immunology
- Molecular Biology
- Gastroenterology
Background:
- MicroRNAs play crucial roles in immune system regulation.
- Colitis is characterized by inflammation of the colon, often involving T cell dysregulation.
- Increased expression of miR-150 was observed in colitogenic CD4+ T cells.
Purpose of the Study:
- To investigate the role of microRNA-150 (miR-150) in the pathogenesis of colitis.
- To determine the impact of miR-150 on T cell responses in colitis models.
Main Methods:
- RNA sequencing was performed on normal and colitogenic CD4+ T cells.
- miR-150 knockout mice and T-cell-specific Rap1KO mice were utilized as colitis models.
- The effect of miR-150 silencing on T cell expansion and colitis development was assessed.
Main Results:
- Colitogenic CD4+ T cells exhibited significantly higher miR-150 expression.
- Silencing miR-150 completely prevented the expansion of pathogenic Th17 cells.
- Inhibition of miR-150 led to the complete suppression of colitis development.
Conclusions:
- miR-150 is a key mediator in the development of colitis.
- Targeting miR-150 presents a promising therapeutic strategy for inflammatory bowel diseases.
- Further research into miR-150's mechanisms could lead to novel treatments for IBD.
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