Department of Chemistry "Giacomo Ciamician", Alma Mater Studiorum - University of Bologna, 40126 Bologna, Italy.
Surgical Sciences and Technologies, IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy.
Biomater Adv. 2024 Oct;163:213968. doi: 10.1016/j.bioadv.2024.213968. Epub 2024 Jul 23.
Strontium, cobalt, and manganese ions are present in the composition of bone and useful for bone metabolism, even when combined with calcium phosphate in the composition of biomaterials. Herein we explored the possibility to include these ions in the composition of apatitic materials prepared through the cementitious reaction between ion-substituted calcium phosphate dibasic dihydrate, CaHPO·2HO (DCPD) and tetracalcium phosphate, Ca(PO)O (TTCP). The results of the chemical, structural, morphological and mechanical characterization indicate that cobalt and manganese exhibit a greater delaying effect than strontium (about 15 at.%) on the cementitious reaction, even though they are present in smaller amounts within the materials (about 0.8 and 4.5 at.%, respectively). Furthermore, the presence of the foreign ions in the apatitic materials leads to a slight reduction of porosity and to enhancement of compressive strength. The results of biological tests show that the presence of strontium and manganese, as well as calcium, in the apatitic materials cultured in direct contact with human mesenchymal stem cells (hMSCs) stimulates their viability and activity. In contrast, the apatitic material containing cobalt exhibits a lower metabolic activity. All the materials have a positive effect on the expression of Vascular Endothelial Growth Factor (VEGF) and Von Willebrand Factor (vWF). Moreover, the apatitic material containing strontium induces the most significant reduction in the differentiation of preosteoclasts into osteoclasts, demonstrating not only osteogenic and angiogenic properties, but also ability to regulate bone resorption.
锶、钴和锰离子存在于骨骼的组成中,对骨骼代谢很有用,即使它们与生物材料组成中的磷酸钙结合也是如此。在此,我们探索了将这些离子纳入通过离子取代的磷酸二氢钙二水合物 CaHPO·2HO(DCPD)与磷酸四钙 Ca(PO)O(TTCP)之间的胶凝反应制备的磷灰石材料组成中的可能性。化学、结构、形态和机械特性的结果表明,即使钴和锰在材料中的含量较小(分别约为 0.8 和 4.5 at.%),它们对胶凝反应的延迟作用也大于锶(约 15 at.%)。此外,外来离子在磷灰石材料中的存在导致孔隙率略有降低和抗压强度增强。生物测试结果表明,在与人骨髓间充质干细胞(hMSCs)直接接触培养的磷灰石材料中存在锶和锰以及钙会刺激其活力和活性。相比之下,含有钴的磷灰石材料表现出较低的代谢活性。所有材料对血管内皮生长因子(VEGF)和血管性血友病因子(vWF)的表达都有积极影响。此外,含有锶的磷灰石材料可最大程度地减少破骨前体细胞向破骨细胞的分化,这不仅表明其具有成骨和血管生成特性,而且还能调节骨吸收。