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Zinc in calcium phosphate mediates bone induction: In vitro and in vivo model

机译:磷酸钙中的锌介导骨诱导:体外和体内模型

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摘要

Zinc-containing tricalcium phosphate (Zn-TCP) was synthesized to investigate the role of zinc in osteoblastogenesis, osteoclastogenesis and in vivo bone induction in an ectopic implantation model. Zinc ions were readily released in the culture medium. Zn-TCP with the highest zinc content enhanced the alkaline phosphatase activity of human bone marrow stromal cells and tartrate-resistant acid phosphatase activity, as well as multinuclear giant cell formation of RAW264.7 monocyte/macrophages. RAW264.7 cultured with different dosages of zinc supplements in medium with or without zinc-free TCP showed that zinc could influence both the activity and the formation of multinuclear giant cells. After a 12-week implantation in the paraspinal muscle of canines, de novo bone formation and bone incidence increased with increasing zinc content in Zn-TCP - up to 52% bone in the free space. However, TCP without zinc induced no bone formation. Although the observed bone induction cannot be attributed to zinc release alone, these results indicate that zinc incorporated in TCP can modulate bone metabolism and render TCP osteoinductive, indicating to a novel way to enhance the functionality of this synthetic bone graft material.
机译:合成了含锌的磷酸三钙(Zn-TCP),以研究异位植入模型中锌在成骨细胞生成,破骨细胞生成和体内骨诱导中的作用。锌离子容易在培养基中释放。锌含量最高的Zn-TCP增强了人骨髓基质细胞的碱性磷酸酶活性和抗酒石酸的酸性磷酸酶活性,以及​​RAW264.7单核细胞/巨噬细胞的多核巨细胞形成。在有或没有无锌TCP的培养基中用不同剂量的锌补充剂培养的RAW264.7表明,锌可以影响活性和多核巨细胞的形成。在犬的椎旁肌中植入12周后,从头开始的骨形成和骨发生率随Zn-TCP中锌含量的增加而增加-高达52%的自由空间中的骨。但是,不含锌的TCP不会引起骨骼形成。尽管观察到的骨诱导不能仅仅归因于锌的释放,但是这些结果表明,TCP中掺入的锌可以调节骨代谢并使TCP具有骨诱导性,这表明增加这种合成骨移植材料功能的新颖方法。

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