METTL3 facilitates osteoblast differentiation and bone regeneration via m6A-dependent maturation of pri-miR-324-5p

IF 2.9 4区 医学 Q2 CELL BIOLOGY
Jing Xiao , Zhiyuan Xu , Zhiwei Deng , Juntong Xie , Yiyan Qiu
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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.
METTL3通过m6a依赖的pri-miR-324-5p成熟促进成骨细胞分化和骨再生
成骨细胞分化对骨折愈合和骨再生至关重要。miR-324-5p与骨质疏松症有关,但其在成骨分化中的确切作用尚不清楚。我们研究了miR-324-5p在骨髓间充质干细胞(BMSCs)中的功能和调控机制。方法采用srt - qpcr检测骨髓间充质干细胞成骨分化过程中miR-324-5p的表达。ALP、茜素红S (ARS)、油红O和TRAP染色来评估成骨细胞、脂肪细胞和破骨细胞的分化。建立大鼠股骨骨折和颅骨骨缺损模型,评估骨再生。使用甲基化RNA免疫沉淀(MeRIP)和荧光素酶报告基因检测来研究mettl3介导的pri-miR-324-5p的m6A修饰及其对ELAVL1的调节。结果miR-324-5p在成骨分化过程中表达增加,ALP和ARS染色证实miR-324-5p过表达后成骨细胞活性和矿化增强。同时,油红O染色显示成脂分化减少,TRAP染色显示破骨细胞形成受到抑制。在体内,miR-324-5p促进骨愈合、骨量和骨再生。在机制上,mettl3介导的m6A修饰促进了pri-miR-324-5p的成熟,积极调节其表达。此外,miR-324-5p直接靶向ELAVL1, ELAVL1过表达逆转了miR-324-5p的成骨作用。结论METTL3/miR-324-5p/ELAVL1轴在成骨分化和骨再生中起着至关重要的作用,为m6A修饰驱动成骨提供了新的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Cellular immunology
Cellular immunology 生物-免疫学
CiteScore
8.20
自引率
2.30%
发文量
102
审稿时长
30 days
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.
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