Wang Chenglong, Shou Zeyu, Xu Chengwei, Huo Kaiyuan, Liu Wenjie, Liu Hao, Zan Xingjie, Wang Qing, Li Lianxin
Department of Orthopaedics Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, 250021, China.
Department of Orthopedics, Zhuji People's Hospital of Zhejiang Province, Zhuji Affiliated Hospital of Wenzhou Medical University, Shaoxing, Zhejiang, 311800, China.
Adv Sci (Weinh). 2025 Mar;12(9):e2410595. doi: 10.1002/advs.202410595. Epub 2025 Jan 13.
Osteointegration, the effective coupling between an implant and bone tissue, is a highly intricate biological process. The initial stages of bone-related immunomodulation and cellular colonization play crucial roles, but have received limited attention. Herein, a novel supramolecular co-assembled coating of strontium (Sr)-doped metal polyphenol networks (MPN) modified with c(RGDfc) is developed and well-characterized, for eliciting an early immunomodulation and cellular colonization. The results showed that the (Sr-MPN)@RGD coating significantly regulated the polarization of macrophages to the M2 phenotype by controllable release of Sr, and promote the initial adhesion of bone marrow mesenchymal stem cells (BMSCs) by RGD presented on MPN. Notably, the (Sr-MPN)@RGD attenuated osteoclast differentiation and oxidative stress as well as enhanced osteoblast differentiation and angiogenesis due to macrophage polarization toward M2 phenotype, which in turn has a profound effect on neighboring cells through paracrine signaling. In vivo results showed that the (Sr-MPN)@RGD coating manifested superior osseointegration and bone maturation to the bare Ti-rod or Ti-rod coated with MPN and Sr-MPN. This work contributed to the design of multifunctional implant coatings that address the complex biological process of osteointegration from the perspective of orchestrating stem cell recruitment with immunomodulatory strategies.
骨整合是植入物与骨组织之间的有效耦合,是一个高度复杂的生物学过程。与骨相关的免疫调节和细胞定植的初始阶段起着关键作用,但受到的关注有限。在此,开发并充分表征了一种新型的超分子共组装涂层,该涂层由用c(RGDfc)修饰的掺锶(Sr)金属多酚网络(MPN)组成,用于引发早期免疫调节和细胞定植。结果表明,(Sr-MPN)@RGD涂层通过可控释放Sr显著调节巨噬细胞向M2表型的极化,并通过MPN上呈现的RGD促进骨髓间充质干细胞(BMSC)的初始粘附。值得注意的是,由于巨噬细胞向M2表型极化,(Sr-MPN)@RGD减弱了破骨细胞分化和氧化应激,并增强了成骨细胞分化和血管生成,这反过来又通过旁分泌信号对邻近细胞产生深远影响。体内结果表明,(Sr-MPN)@RGD涂层相对于裸钛棒或涂有MPN和Sr-MPN的钛棒表现出优异的骨整合和骨成熟。这项工作有助于设计多功能植入物涂层,从通过免疫调节策略协调干细胞募集的角度解决骨整合这一复杂的生物学过程。