Shanghai Key Laboratory of Tissue Engineering, Department of Plastic and Reconstructive Surgery of Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, P. R. China.
National Tissue Engineering Center of China, Shanghai, 200241, P. R. China.
Adv Sci (Weinh). 2024 Mar;11(9):e2305580. doi: 10.1002/advs.202305580. Epub 2023 Dec 21.
Tissue-engineered bone has emerged as a promising alternative for bone defect repair due to the advantages of regenerative bone healing and physiological functional reconstruction. However, there is very limited breakthrough in achieving favorable bone regeneration due to the harsh osteogenic microenvironment after bone injury, especially the avascular and hypoxic conditions. Inspired by the bone developmental mode of endochondral ossification, a novel strategy is proposed for tolerant and rapid endochondral bone regeneration using framework-enhanced 3D biomineralized matrix hydrogels. First, it is meticulously designed 3D biomimetic hydrogels with both hypoxic and osteoinductive microenvironment, and then integrated 3D-printed polycaprolactone framework to improve their mechanical strength and structural fidelity. The inherent hypoxic 3D matrix microenvironment effectively activates bone marrow mesenchymal stem cells self-regulation for early-stage chondrogenesis via TGFβ/Smad signaling pathway due to the obstacle of aerobic respiration. Meanwhile, the strong biomineralized microenvironment, created by a hybrid formulation of native-constitute osteogenic inorganic salts, can synergistically regulate both bone mineralization and osteoclastic differentiation, and thus accelerate the late-stage bone maturation. Furthermore, both in vivo ectopic osteogenesis and in situ skull defect repair successfully verified the high efficiency and mechanical maintenance of endochondral bone regeneration mode, which offers a promising treatment for craniofacial bone defect repair.
组织工程骨因其具有再生骨愈合和生理功能重建的优势,已成为骨缺损修复的一种很有前途的替代方法。然而,由于骨损伤后的成骨微环境恶劣,特别是血运不良和缺氧条件,在实现良好的骨再生方面取得的突破非常有限。受软骨内成骨发育模式的启发,提出了一种使用增强型 3D 生物矿化基质水凝胶实现耐受力和快速软骨内骨再生的新策略。首先,精心设计了具有缺氧和成骨诱导微环境的 3D 仿生水凝胶,然后集成了 3D 打印的聚己内酯框架来提高其机械强度和结构保真度。由于有氧呼吸的障碍,固有缺氧的 3D 基质微环境可通过 TGFβ/Smad 信号通路有效激活骨髓间充质干细胞的自我调节作用,从而促进早期软骨生成。同时,由天然组成的成骨无机盐的混合配方形成的强生物矿化微环境可以协同调节骨矿化和破骨细胞分化,从而加速晚期骨成熟。此外,异位成骨的体内实验和颅骨缺损的原位修复都成功验证了软骨内骨再生模式的高效性和机械维持性,为颅面骨缺损修复提供了一种很有前途的治疗方法。
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