Drug-Releasing Hydrogel Promotes Regulatory T Cells and Bone Repair in Mice
Published in Immunology, Journals, Nanomedicine.
Published October 25, 2026.
Researchers reporting in Nature Biomedical Engineering developed a drug-releasing hydrogel that encourages local regulatory T-cell activity and improves bone repair in an experimental skull-defect model.
Gabriele Nasello and colleagues incorporated AS2863619, a cyclin-dependent kinase inhibitor, into collagen hydrogels. Loading the compound above its solubility limit reduced the initial burst of drug release and extended exposure. Adding laponite nanoparticles slowed release further.
Sustained exposure helped stabilize Foxp3 expression in CD4-positive T cells, supporting the induction and maintenance of a regulatory T-cell phenotype. In the mouse bone-defect experiments, the drug-loaded gels increased local regulatory T-cell activity, reduced pro-inflammatory macrophage responses and enhanced regeneration.
The formulation containing laponite achieved complete bridging of the defect in some cases. That result should not be interpreted as universal healing across all animals or injuries.
The approach aims to influence immune cells directly at the repair site, avoiding the cell-isolation and expansion steps used in adoptive therapies. These are preclinical findings; effectiveness, dosing and long-term safety in human bone injuries remain to be established.
Source: Nasello et al., Nature Biomedical Engineering, October 23, 2026.