Lithium nanowires accelerate bone repair in an animal model
In an aged jaw defect model, the material reduced local iron accumulation, alleviated immune cell aging, and accelerated bone regeneration.
Limit: Local concentration of released lithium was not measured in vivo
Edited by Boris Djordjevic · AgingResearch.News
In an experiment in cells and animals, researchers tested lithium-doped hydroxyapatite nanowires on bone marrow-derived macrophages and aged bone marrow mesenchymal stem cells grown in the lab, and in an aged jaw defect model. Macrophages are immune cells that clear waste and debris. In the cultured cells, the nanowires alleviated macrophage senescence, a state in which cells stop dividing. The material restored the balance of lysosomes, cell compartments that break down waste. It restored their acidity, preserved their membranes, and maintained their iron storage. This suppressed ferroptosis, a form of iron-dependent cell death. These immune cells then enhanced the development of aged stem cells into bone-forming cells.
In the aged jaw defect model, the nanowires alleviated macrophage ferroptosis and senescence. The material also reduced local iron accumulation and accelerated bone regeneration.
Why it matters
Bone repair slows with age, partly because senescent immune cells in the skeleton hinder tissue regeneration. Targeting cellular aging and iron balance in these immune cells may offer a strategy for repairing bone defects in older individuals.
Caveats
The findings come from cells grown in the lab and an animal defect model, so they may not apply to people. The study also evaluated healing only in the jawbone and did not report sample sizes.
- Lithium-doped hydroxyapatite nanowires
- Ferroptosis
- Cellular senescence
- Stem cell differentiation
- Iron accumulation
- Bone defect
The paper
Shanghai Jiao Tong University
Advanced Science, Oct 25, 2026, Open access
