骨髓间充质干细胞来源外泌体在成骨过程中的调控机制及临床应用前景

Exosomes from Bone Marrow Mesenchymal Stem Cells: Regulatory Mechanisms and Clinical Application Prospects in Osteogenesis

摘要: 骨形成是一个由多种细胞及生物大分子共同参与、复杂而精细的生物学过程，这一过程包含了软骨模板形成、成骨分化、成骨细胞活动，以及骨重建等一系列步骤。在骨髓的复杂微环境中，骨髓间充质干细胞(BMSCs)作为一类独特的细胞群体，凭借其多向分化能力而备受瞩目。这类细胞不仅能在特定条件下转化为成骨细胞、脂肪细胞和软骨细胞，还在组织修复与再生领域发挥重要作用。尤其在骨折愈合、骨质疏松治疗及软骨损伤修复等方面，BMSCs展现出巨大的应用潜力。与此同时，细胞分泌的微小囊泡——外泌体(exosomes)，正逐渐成为科研领域的热点。这些直径为30~150纳米的囊泡，富含蛋白质、核酸和脂质等生物活性分子，是细胞间通讯的重要媒介，能够调控免疫反应、细胞增殖与分化等关键生命过程。值得注意的是，从骨髓间充质干细胞中提取的外泌体(BMSCs-Exos)，相较于其母细胞，具有稳定性高、易保存、免疫原性低和易控制的优点。近年来，BMSCs-Exos在骨质疏松、骨折愈合、软骨修复及关节疾病等方面的治疗潜力日益受到重视。通过深入研究外泌体在成骨过程中的调控机制，有望为开发新的骨科治疗策略和生物材料提供重要启示。总体而言，BMSCs-Exos对成骨分化起着关键的调节作用，有望为骨缺损的防治提供新思路。

Abstract: Bone formation is a complex and precise biological process involving various cells and biomacromolecules. It encompasses a series of steps, including cartilage template formation, osteogenic differentiation, osteoblast activity, and bone remodeling. Within the intricate microenvironment of the bone marrow, bone marrow mesenchymal stem cells (BMSCs), as a unique cell population, have attracted considerable attention due to their multi‑directional differentiation potential. These cells can not only differentiate into osteoblasts, adipocytes, and chondrocytes under specific conditions but also play a significant role in tissue repair and regeneration. Particularly in fracture healing, osteoporosis treatment, and cartilage injury repair, BMSCs demonstrate substantial application potential. At the same time, exosomes—tiny vesicles secreted by cells—are increasingly becoming a research focus. These vesicles, with diameters ranging from 30 to 150 nanometers, are rich in bioactive molecules such as proteins, nucleic acids, and lipids. They serve as important mediators of intercellular communication, regulating key biological processes including immune responses, cell proliferation, and differentiation. Notably, exosomes derived from bone marrow mesenchymal stem cells (BMSCs‑Exos) offer advantages over their parental cells, such as high stability, ease of storage, low immunogenicity, and controllability. In recent years, the therapeutic potential of BMSCs‑Exos in osteoporosis, fracture healing, cartilage repair, and joint diseases has gained growing recognition. In‑depth research into the regulatory mechanisms of exosomes in osteogenesis may provide important insights for developing novel orthopedic therapeutic strategies and biomaterials. Overall, BMSCs‑Exos play a key regulatory role in osteogenic differentiation and hold promise for offering new approaches to the prevention and treatment of bone defects.