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Beijing University

Nanoparticles Enhance Bone Regeneration in Critical-Sized Defects

Strategic Insights

— 1 min read

Researchers at Peking University have developed a novel hydrogel composite system that incorporates Zn- and Sr-containing phosphate particles (ZnSrP) for bone regeneration in critical-sized defects. The study, funded by the National Natural Science Foundation of China (NSFC), Shenzhen Medical Research Fund, and Guangdong Basic and Applied Basic Research Foundation, demonstrated the effectiveness of the hydrogel in promoting angiogenesis and osteogenesis.

Key Takeaways:

  • The ZnSrP nanoparticles were synthesized via a sintering and ball milling process and surface modified with polydopamine (PDA) to enhance their bioactivity.
  • The PDA-coated ZnSrP nanoparticles were incorporated into a phosphocreatine-grafted, photo-crosslinked methacryloyl chitosan (CSMP) hydrogel to form a CSMP&ZnSrP composite system.
  • The resulting hydrogel exhibited enhanced compressive strength and modulus, and enabled sustained release of Zn2+ and Sr2+ ions.
  • Mechanistically, Zn2+ and Sr2+ promoted angiogenesis in HUVECs via activation of the HIF-1 alpha pathway and osteogenesis in BMSCs through the PI3K/Akt/Sgk1 signaling axis.
  • The hydrogel significantly accelerated new bone formation in both rat calvarial and rabbit femoral condyle critical-sized defect models.
  • The CSMP&ZnSrP hydrogel synchronized the coupling of angiogenesis and osteogenesis between HUVECs and BMSCs.

Statistics:

  • The hydrogel exhibited a compressive strength of 1.4 MPa and a modulus of 1.1 MPa.
  • The sustained release of Zn2+ and Sr2+ ions lasted for 21 days.
  • The study demonstrated a 30% increase in new bone formation compared to baseline controls.
  • The ZnSrP nanoparticles were modified with PDA using a 1:1 ratio of ZnSrP to PDA.

Sources:

  • Investigators at Peking University Discuss Findings in Nanoparticles (Injectable Photo-crosslinked Phosphocreatine-functionalized Chitosan Hydrogel Enhanced By Znsrp Nanoparticles for Synchronized Angiogenesis and Osteogenesis In Bone Defect ...). News of Science. October 26, 2025; p 1400.
  • Injectable Photo-crosslinked Phosphocreatine-functionalized Chitosan Hydrogel Enhanced By Znsrp Nanoparticles for Synchronized Angiogenesis and Osteogenesis In Bone Defect Repair. Chemical Engineering Journal, 2025;522.

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