New research has developed a mineralized DNA hydrogel that combines immunomodulation with sustained bone regeneration. The researchers used tetrahedral DNA nanostructures and calcium phosphate mineralization to create a scaffold that supports osteogenic stem cells while promoting healing-friendly macrophage activity. In animal models, this material promoted bone repair, improved tissue mineralization, and prolonged structural stability. This discovery has the potential to advance next-generation biomaterials for craniofacial reconstruction, trauma, and difficult bone healing disorders worldwide.
Bone defects caused by trauma, infection, tumors, and congenital diseases remain a major clinical challenge. Surgeons commonly rely on bone grafts, but these procedures have significant hurdles, including limited donor availability, immune rejection, risk of infection, and additional surgery. Therefore, tissue engineering researchers have sought biomaterials that can guide the body to naturally regenerate bone while controlling inflammation during healing. Hydrogels can mimic the body’s extracellular matrix, but many existing materials degrade too quickly to provide long-term regenerative support.
The research team tackling this challenge was led by Professor Yunfeng Lin and Professor Taoran Tian from the State Key Institute of Oral Diseases and the National Center for Stomatology, Sichuan University and West China Stomatology Center in China. The researchers developed a mineralized DNA hydrogel called a “cap gel” using tetrahedral framework nucleic acids, small programmable DNA nanostructures that self-assemble to form a stable three-dimensional scaffold. This material was designed to combine immunomodulation and sustained osteogenic activity through controlled calcium phosphate mineralization. Their findings were published online in Volume 14 of the journal May 8, 2026. bone research.
The scientists focused on two biological processes essential to bone repair: inflammation control and osteogenesis, or the formation of new bone tissue. The cap gel was designed to switch macrophages to an “M2” healing phenotype that promotes tissue regeneration. Laboratory experiments showed that this material decreased inflammatory markers such as IL-6 and TNF-α, while increasing anti-inflammatory and regenerative signals such as IL-10, TGF-β, and BMP2. The hydrogel also helped reduce oxidative stress in immune cells, creating a more favorable healing environment.
At the same time, the mineralized structure of Cap-Gel served as a long-term reservoir of calcium ions, which is important for bone formation and cell signaling. The researchers found that the hydrogel gradually released calcium over several weeks, activating pathways associated with osteogenic differentiation. Bone marrow stem cells exposed to cap gel showed strong expression of bone morphogenetic proteins such as RUNX2, ALP, osteopontin, and collagen I compared to the control group. The material also promoted the formation of calcified nodules and exhibited active osteogenic activity.
”Our goal is not just to fill in the gaps;” explained Professor Lin.We were looking for a scaffold that could actively communicate with immune and stem cells and regenerate a healing environment from the beginning. ”
To evaluate the material in biological systems, the research team implanted Cap-Gel into skull defects in rats. Image and tissue analysis showed that the hydrogel promoted bone repair. Early after implantation, this material decreased the inflammatory infiltrate and increased the presence of pro-healing macrophages. Over time, defects treated with Cap-Gel developed a denser collagen network, more organized bone structure, and larger bone volume than untreated controls or nonmineralized hydrogels. After 8 weeks, the regenerated bone showed a mature structure and stronger mineralization.
The researchers believe this work has the potential to foster collaboration across regenerative medicine, biomaterials science, nanotechnology, and immunology. Because this material combines programmable DNA nanostructures and bioactive mineral components, it may inspire future strategies such as cartilage repair, dental reconstruction, chronic wound healing, and implant integration. The ability to induce immune responses while supporting tissue regeneration is increasingly considered critical to the success of biomedical engineering.
Professor Tian said the project was motivated by challenges in craniofacial repair. ”Patients with severe bone defects often require multiple surgeries and lengthy recovery. ” he pointed out. ”By designing materials that work in conjunction with the body’s immune system, we hope to reduce complications and improve long-term healing outcomes. ”
Overall, our findings demonstrate how programmable DNA nanotechnology can be combined with mineral engineering to create a new generation of regenerative biomaterials. By integrating immunomodulation and sustained bone formation, Cap-Gel provides a promising framework for treatments aimed at repairing difficult bone defects while harnessing the body’s natural healing powers.
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Reference magazines:
Yao, L. others. (2026). Mineralized DNA tetrahedral structured hydrogels: dual functional scaffolds for immunomodulation and bone regeneration. Bone research. DOI: 10.1038/s41413-026-00530-8. https://www.nature.com/articles/s41413-026-00530-8
