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This study investigated a novel composite biomaterial for promoting maxillofacial bone regeneration. The research involved embedding immunomodulatory mesenchymal stem cell-derived nanovesicles into an injectable bioadhesive hydrogel, thereby constructing an integrated therapeutic platform. This platform aims to achieve a "dual immunomodulation and osteogenesis" synergy by releasing the active components of the nanovesicles in a sustained manner, simultaneously regulating the immune microenvironment in the bone defect area (such as promoting macrophage polarization towards a repair phenotype) and directly inducing osteogenesis, thus providing a new strategy for the repair of complex bone defects. The research results were titled "MSC nanovesicle-embedded bioadhesive hydrogel enables dual immunomodulation and osteogenesis for maxillofacial bone regeneration" and were published in the international authoritative journal "Bioactive Materials" on March 2, 2026, with the DOI: 10.1016/j.bioactmat.2026.02.032.
Innovations
01 "Spatial and Temporal Synergy of Dual Functions"
Breaking through the traditional approach of delivering only growth-promoting factors, this study innovatively integrates two key repair functions - immunomodulation (nanovesicles) and osteogenesis-induction (hydrogel microenvironment) - into a single platform. This design mimics the natural process of bone healing, aiming to initiate and maintain the regeneration process more efficiently by first regulating the inflammatory microenvironment and then promoting osteogenesis in a hierarchical manner.
02 "Biomimetic Cell-Free" Delivery Strategy
Using nanovesicles secreted by stem cells as the active components, this approach avoids the risks and challenges associated with directly using live cells, such as survival, tumorigenicity, and immune rejection. This "cell-free" treatment mode based on natural secretions of cells is safer and easier to standardize in preparation and storage, representing an important path towards clinical application.
03 "Smart Staying" Carrier Platform
The use of injectable bioadhesive hydrogels with biocompatibility as the carrier ensures close adherence to irregular bone defects, enabling local in situ retention and long-term sustained release of the drugs. This solves the problem of drug diffusion and short duration of action in traditional injectable solutions, ensuring a continuous and effective concentration of the therapeutic components at the target location.
Journal Name: Bioactive Materials
Publication Date: March 2, 2026
DOI: 10.1016/j.bioactmat.2026.02.032
Research Team: Tingting Yu, Jiale Yan, Jingwei Wang, Zhiqiang Song, Rushui Bai, Yuntao Lu, Qin Niu, Tianyu Cai, Bing Han, Xing Wang, Yan Wei
