Strontium- and Copper-Doped Ceramic Granules in Bone Regeneration-Associated Cellular Processes

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Research

Background:

• Pathological bone fracturing is a growing concern due to aging and obesity.
• Tricalcium-phosphate-based materials (TCP) are known for biocompatibility and osteoconductivity.
• Strontium (Sr) and copper (Cu) doping enhances TCP properties for bone regeneration.

Purpose of the Study:

• To design and characterize strontium and copper-doped TCP porous granules (CuSr TCP).
• To evaluate the biocompatibility, osteogenic, and angiogenic potential of CuSr TCP.
• To assess the impact of CuSr TCP on mesenchymal stem cells and osteoblast progenitor cells.

Main Methods:

• X-ray diffraction for material characterization.
• Cytotoxicity (LDH) and proliferation (CCK-8) assays using rat bone marrow-derived mesenchymal stem cells (BM-MSCs).
• Osteogenesis assessment (ALP, Alizarin Red S) and angiogenesis studies in human umbilical vein endothelial cells (HUVECs).

Main Results:

• CuSr TCP was not cytotoxic and did not inhibit cell proliferation at tested concentrations (0.1-1 mg/mL).
• A concentration of 0.5 mg/mL CuSr TCP significantly increased BM-MSC migration by 2.5-fold.
• CuSr TCP enhanced early osteogenesis and significantly improved angiogenic parameters compared to unsubstituted TCP.

Conclusions:

• CuSr TCP porous granules are biocompatible and support osteodifferentiation and angiogenesis.
• The enhanced properties suggest CuSr TCP is a promising material for bone defect treatment.
• Further in vivo studies are recommended to validate the therapeutic potential of CuSr TCP.