{"title":"METTL3 facilitates osteoblast differentiation and bone regeneration via m6A-dependent maturation of pri-miR-324-5p","authors":"Jing Xiao , Zhiyuan Xu , Zhiwei Deng , Juntong Xie , Yiyan Qiu","doi":"10.1016/j.cellimm.2025.104974","DOIUrl":null,"url":null,"abstract":"<div><h3>Background</h3><div>Osteoblast differentiation is essential for fracture healing and bone regeneration. miR-324-5p has been implicated in osteoporosis, but its precise role in osteogenic differentiation remains unclear. We investigated the function and regulatory mechanisms of miR-324-5p in bone marrow mesenchymal stem cells (BMSCs).</div></div><div><h3>Methods</h3><div>RT-qPCR was used to assess miR-324-5p expression during osteogenic differentiation of BMSCs. ALP, Alizarin Red S (ARS), Oil Red O, and TRAP staining were performed to evaluate osteoblast, adipocyte, and osteoclast differentiation. Rat femoral fracture and calvarial bone defect models were established to assess in vivo bone regeneration. Methylated RNA immunoprecipitation (MeRIP) and luciferase reporter assays were used to investigate METTL3-mediated m6A modification of pri-miR-324-5p and its regulation of ELAVL1.</div></div><div><h3>Results</h3><div>miR-324-5p expression increased during osteogenic differentiation, and ALP and ARS staining confirmed enhanced osteoblast activity and mineralization following miR-324-5p overexpression. Meanwhile, Oil Red O staining showed reduced adipogenic differentiation, and TRAP staining demonstrated suppressed osteoclast formation. In vivo, miR-324-5p promoted bone healing, bone mass, and bone regeneration. Mechanistically, METTL3-mediated m6A modification facilitated pri-miR-324-5p maturation, positively regulating its expression. Additionally, miR-324-5p directly targeted ELAVL1, and ELAVL1 overexpression reversed the osteogenic effects of miR-324-5p.</div></div><div><h3>Conclusion</h3><div>The METTL3/miR-324-5p/ELAVL1 axis plays a crucial role in osteogenic differentiation and bone regeneration, providing new insights into m6A modification-driven osteogenesis.</div></div>","PeriodicalId":9795,"journal":{"name":"Cellular immunology","volume":"413 ","pages":"Article 104974"},"PeriodicalIF":2.9000,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cellular immunology","FirstCategoryId":"3","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0008874925000590","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CELL BIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Background
Osteoblast differentiation is essential for fracture healing and bone regeneration. miR-324-5p has been implicated in osteoporosis, but its precise role in osteogenic differentiation remains unclear. We investigated the function and regulatory mechanisms of miR-324-5p in bone marrow mesenchymal stem cells (BMSCs).
Methods
RT-qPCR was used to assess miR-324-5p expression during osteogenic differentiation of BMSCs. ALP, Alizarin Red S (ARS), Oil Red O, and TRAP staining were performed to evaluate osteoblast, adipocyte, and osteoclast differentiation. Rat femoral fracture and calvarial bone defect models were established to assess in vivo bone regeneration. Methylated RNA immunoprecipitation (MeRIP) and luciferase reporter assays were used to investigate METTL3-mediated m6A modification of pri-miR-324-5p and its regulation of ELAVL1.
Results
miR-324-5p expression increased during osteogenic differentiation, and ALP and ARS staining confirmed enhanced osteoblast activity and mineralization following miR-324-5p overexpression. Meanwhile, Oil Red O staining showed reduced adipogenic differentiation, and TRAP staining demonstrated suppressed osteoclast formation. In vivo, miR-324-5p promoted bone healing, bone mass, and bone regeneration. Mechanistically, METTL3-mediated m6A modification facilitated pri-miR-324-5p maturation, positively regulating its expression. Additionally, miR-324-5p directly targeted ELAVL1, and ELAVL1 overexpression reversed the osteogenic effects of miR-324-5p.
Conclusion
The METTL3/miR-324-5p/ELAVL1 axis plays a crucial role in osteogenic differentiation and bone regeneration, providing new insights into m6A modification-driven osteogenesis.
期刊介绍:
Cellular Immunology publishes original investigations concerned with the immunological activities of cells in experimental or clinical situations. The scope of the journal encompasses the broad area of in vitro and in vivo studies of cellular immune responses. Purely clinical descriptive studies are not considered.
Research Areas include:
• Antigen receptor sites
• Autoimmunity
• Delayed-type hypersensitivity or cellular immunity
• Immunologic deficiency states and their reconstitution
• Immunologic surveillance and tumor immunity
• Immunomodulation
• Immunotherapy
• Lymphokines and cytokines
• Nonantibody immunity
• Parasite immunology
• Resistance to intracellular microbial and viral infection
• Thymus and lymphocyte immunobiology
• Transplantation immunology
• Tumor immunity.