IGFBP5 alleviates periodontitis by reversing human dental follicle stem cell senescence via the non-canonical Wnt pathway.

The improvement of health and the delay of aging represent pivotal goals in medical research. Bone aging contributes to various age-related disorders, including periodontitis. Dental follicle stem cells (DFSCs) serve as ideal seed cells for periodontal regenerative therapy. Insulin-like growth factor binding protein 5 (IGFBP5) has been reported to exert complex and context-dependent effects. However, its role in DFSC senescence remains undefined. In this study, we observed a significant decrease in IGFBP5 expression in DFSCs undergoing replicative or H₂O₂-induced senescence. Functional experiments demonstrated that IGFBP5 overexpression alleviated cellular senescence and enhanced osteogenic potential, a process linked to the modulation of non-canonical Wnt signaling. WNT5B was then identified as a potential downstream regulator involved in mediating the pro-osteogenic effects of IGFBP5. To translate these findings clinically, we developed Gel-vHA@oe-DFSC, a nanoparticle-embedded hydrogel system for cell delivery, which enhanced the therapeutic efficacy of DFSCs and promoted periodontal regeneration in a rat model. Collectively, our study reveals a novel function of IGFBP5 in mitigating DFSC senescence and presents a promising strategy for combating periodontal bone loss.