Abstract
Background: Ulcerative colitis (UC) is an inflammatory intestinal disorder featured by mucosal injury. MicroRNAs (miRNAs) play a role in the pathogenesis underlying UC.
Objectives: This study was conducted to investigate the role of miR-29c-3p in a dextran sodium sulfate (DSS)-induced UC mouse model and provide targets for UC treatment.
Methods: The UC mouse model was established by DSS induction. The expression levels of miR- 29c-3p, lysine-specific demethylase 6B (KDM6B), zonula occludens-1 (ZO-1), Occludin, and lactate dehydrogenase A (LDHA) were detected by real-time quantitative polymerase chain reaction or Western blot assays. The mucosal injury was evaluated by disease activity index (DAI), colon length, Hematoxylin-Eosin staining, and fluorescein isothiocyanate-glucan permeability test. The binding between miR-29c-3p and KDM6B and the occupation of KDM6B or trimethylated H3 lysine 27 (H3K27me3) on the LDHA promoter were analyzed by the dual-luciferase and chromatinimmunoprecipitation assays.
Results: miR-29c-3p was downregulated while KDM6B and LDHA were upregulated in DSS mice. miR-29c-3p overexpression reduced DAI and inflammatory cell infiltration while increasing colon length, intestinal permeability, and levels of ZO-1 and Occludin. miR-29c-3p inhibited KDM6B expression and increased H3K27me3 occupation on the LDHA promoter, thus inhibiting LDHA transcription. Overexpression of KDM6B or LDHA averted the protective role of miR-29c-3p upregulation in mucosal injury.
Conclusion: miR-29c-3p limited KDM6B expression and increased the H3K27me3 occupation on the LDHA promoter to enhance LDHA transcription, moderating mucosal injury and delaying UC progression.
Graphical Abstract
[http://dx.doi.org/10.7861/clinmed.2021-0080] [PMID: 33762374]
[http://dx.doi.org/10.1016/j.mayocp.2019.01.018] [PMID: 31272578]
[http://dx.doi.org/10.1515/jbcpp-2018-0036] [PMID: 30063466]
[http://dx.doi.org/10.1038/d41586-018-07276-2] [PMID: 30405234]
[http://dx.doi.org/10.1016/j.lfs.2020.118129] [PMID: 32717271]
[http://dx.doi.org/10.1093/bib/bby054] [PMID: 29982332]
[http://dx.doi.org/10.1016/j.autrev.2013.07.003] [PMID: 23860189]
[http://dx.doi.org/10.3389/fphar.2021.707776] [PMID: 34305614]
[http://dx.doi.org/10.1002/jcb.29896] [PMID: 33529442]
[http://dx.doi.org/10.1186/s12974-020-01958-3] [PMID: 33032631]
[http://dx.doi.org/10.1016/j.celrep.2020.108576] [PMID: 33406428]
[http://dx.doi.org/10.2147/JIR.S302832] [PMID: 34040415]
[http://dx.doi.org/10.1038/emm.2017.11] [PMID: 28450737]
[http://dx.doi.org/10.1016/j.bcp.2022.115165] [PMID: 35803318]
[http://dx.doi.org/10.1038/srep21735] [PMID: 26902416]
[http://dx.doi.org/10.7150/thno.53347] [PMID: 33664867]
[http://dx.doi.org/10.1080/21655979.2022.2037957] [PMID: 35735114]
[http://dx.doi.org/10.1016/j.immuni.2010.03.003] [PMID: 20303296]
[http://dx.doi.org/10.1016/j.intimp.2019.105768] [PMID: 31382166]
[http://dx.doi.org/10.1006/meth.2001.1262] [PMID: 11846609]
[http://dx.doi.org/10.1093/nar/gkt1248] [PMID: 24297251]
[http://dx.doi.org/10.7554/eLife.05005] [PMID: 26267216]
[http://dx.doi.org/10.1016/j.cell.2006.07.031] [PMID: 16990141]
[http://dx.doi.org/10.1016/j.intimp.2022.109000] [PMID: 35777266]
[http://dx.doi.org/10.1007/s40265-016-0676-y] [PMID: 28078646]
[http://dx.doi.org/10.1007/s10735-021-10021-1] [PMID: 34623552]
[http://dx.doi.org/10.1042/CS20140048] [PMID: 24641356]
[http://dx.doi.org/10.1053/j.gastro.2021.05.060] [PMID: 34116030]
[http://dx.doi.org/10.1152/ajpgi.00020.2017] [PMID: 28280141]
[http://dx.doi.org/10.1016/j.intimp.2020.106610] [PMID: 32473571]
[http://dx.doi.org/10.1053/j.gastro.2021.08.047] [PMID: 34478742]
[http://dx.doi.org/10.1016/j.jbc.2022.102017] [PMID: 35526564]
[http://dx.doi.org/10.1111/adb.12816] [PMID: 31373129]
[http://dx.doi.org/10.1096/fj.201902200RR] [PMID: 31971317]
[http://dx.doi.org/10.1016/j.yexcr.2020.112173] [PMID: 32679234]
[http://dx.doi.org/10.15252/embj.201899735] [PMID: 30209241]