Enhancing pulp regeneration through metabolic reprogramming of mature dental pulp stem cells mediated by GLUT1/HK2 mRNA delivery.

The age-related decline in the pro-angiogenic capacity of mature dental pulp stem cells (DPSCs) severely limits pulp regeneration. We identify impaired glycolytic metabolism, driven by reduced glucose transporter type 1 (GLUT1) and hexokinase 2 (HK2) expression, as the key mechanism, as its inhibition diminished endothelial tube formation. To reverse this, we developed an aminolyzed highly branched poly(β-amino ester) (HBPA) as a vector for GLUT1/HK2 mRNA co-delivery, achieving >90% transfection efficiency with excellent biocompatibility. In vitro, conditioned medium from reprogrammed mature DPSCs resulted in a 2.0-fold increase in capillary length and a 2.3-fold increase in branch points, restoring angiogenic potential to levels equivalent to those of immature DPSCs. This efficacy translated robustly in vivo, where a tooth root slice model showed reprogrammed cells generated tissue with a vessel density of 10.2 vessels per mm2, 2.5-fold higher than that of untreated controls. Crucially, this level of vascularization was statistically indistinguishable from that achieved by the benchmark immature DPSCs. Our study demonstrates that HBPA-mediated metabolic reprogramming effectively rejuvenates mature DPSCs by restoring the "Metabolic-ECM-Angiogenesis Axis", offering a translatable strategy for predictable, vascularized pulp regeneration.