Department of Clinical Laboratory, China Japan Union Hospital of Jilin University, Changchun, 130033, China.
Department of Orthopedics, Shandong Provincial Hospital Affiliated to Shandong First Medical University, No.324, Jingwuweiseven Road, Huaiyin District, Jinan, 250014, Shandong Province, China.
Hum Cell. 2023 May;36(3):1041-1053. doi: 10.1007/s13577-023-00881-y. Epub 2023 Mar 23.
Bone fracture healing is a complex physiologic process that involves changes in the expression of several thousand genes. Long noncoding RNAs (lncRNAs) may have critical biological roles in this process. The objectives of the present study were to determine whether BMSC-derived exosomal lncTUG1 can enhance osteogenic differentiation and thereby promoting bone fracture recovery and to investigate its potential mechanisms of action. Bone marrow mesenchymal stromal cells were isolated from mice and cultured for the following experiments. After adipogenic and osteogenic differentiation induction, Oil Red O, alizarin red S, and alkaline phosphatase staining solutions were applied to confirm the formation of lipid droplets and calcium nodules. Western blotting analyses, real-time reverse transcription PCR assays, luciferase reporter were performed to confirm relative RNA and protein expressions and luciferase activities of transfected cells. RNA pull-down and RNA immunoprecipitation assays were also carried to verify the interaction between lncTUG1 and miR-22-5p. Additionally, a mouse model of closed femoral fractures was generated to evaluate the in vivo effect of increased lncTUG1 on fracture healing. BMSC-derived exosomal lncTUG1 enhanced the activity of osteoblasts. Overexpression of miR-22-5p reversed the osteopromoting effect of increased lncTUG1. The knockdown of Anxa8 reversed the osteogenic effect of miR-22-5p inhibitors, indicating an interaction between Anxa8 and miR-22-5p. Upregulation of lncTUG1 could promote the fracture recovery in vivo. In conclusion, the present study highlights the functional importance of BMSC-derived exosomal lncTUG1 in the process of bone fracture recovery.
骨愈合是一个复杂的生理过程,涉及几千个基因的表达变化。长非编码 RNA(lncRNA)可能在这个过程中具有关键的生物学作用。本研究的目的是确定骨髓间充质干细胞来源的外泌体 lncTUG1 是否可以增强成骨分化,从而促进骨骨折恢复,并探讨其潜在的作用机制。分离并培养小鼠的骨髓间充质基质细胞,进行以下实验。经成脂和成骨分化诱导后,应用油红 O、茜素红 S 和碱性磷酸酶染色液来确认脂滴和钙结节的形成。通过 Western blot 分析、实时逆转录 PCR 检测和荧光素酶报告基因实验,验证转染细胞中相对 RNA 和蛋白表达以及荧光素酶活性。还进行了 RNA 下拉和 RNA 免疫沉淀实验,以验证 lncTUG1 与 miR-22-5p 之间的相互作用。此外,还建立了闭合性股骨骨折的小鼠模型,以评估体内增加 lncTUG1 对骨折愈合的影响。BMSC 衍生的外泌体 lncTUG1 增强了成骨细胞的活性。miR-22-5p 的过表达逆转了 lncTUG1 增加的促骨作用。Anxa8 的敲低逆转了 miR-22-5p 抑制剂的成骨作用,表明 Anxa8 和 miR-22-5p 之间存在相互作用。lncTUG1 的上调可以促进体内骨折的恢复。综上所述,本研究强调了 BMSC 衍生的外泌体 lncTUG1 在骨骨折恢复过程中的功能重要性。
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