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Evaluation of rhBMP-2/collagen/TCP-HA bone graft with and without bone marrow cells in the canine femoral multi defect model

机译:有和没有骨髓细胞的rhBMP-2 /胶原蛋白/ TCP-HA骨移植在犬股骨多缺损模型中的评估

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Recombinant human bone morphogenetic protein-2, when applied to an absorbable type 1 bovine collagen sponge (rhBMP-2/ACS) is an effective therapy in many bone grafting settings. Bone marrow aspirate (BMA) has also been used as a source of transplantable osteogenic connective tissue progenitors. This study was designed to characterize the performance of a scaffold comprising rhBMP-2/ACS in which the sponge wraps around tri-calcium phosphate hydroxyapatite granules (rhBMP-2/ACS/TCP-HA) and to test the hypothesis that addition of BMA will improve the performance of this construct in the Canine Femoral Multi Defect Model. In each subject, two sites were grafted with rhBMP-2/ACS/TCP-HA scaffold loaded with BMA clot and two other sites with rhBMP-2/ACS/TCP-HA scaffold loaded with wound blood (WB). After correction for unresorbed TCP-HA granules, sites grafted with rhBMP-2/ACS/TCP-HA+BMA and rhBMP-2/ACS/TCP-HA+WB were similar, with mean percent bone volumes of 10.9 % ± 1.2 and 11.2 % ± 1.2, respectively. No differences were seen in quantitative histomorphometry. While bone formation using both constructs was robust, this study did not support the hypothesis that the addition of unprocessed bone marrow aspirate clot improved bone regeneration in a site engrafted with rhBMP-2/ACS/TCP-HA+BMA. In contrast to prior studies using this model, new bone formation was greater at the center of the defect where TCP-HA was distributed. This finding suggests a potential synergy between rhBMP-2 and the centrally placed ceramic and cellular components of the graft construct. Further optimization may also require more uniform distribution of TCP-HA, alternative cell delivery strategies, and a more rigorous large animal segmental defect model.
机译:将重组人骨形态发生蛋白2应用于可吸收的1型牛胶原海绵(rhBMP-2 / ACS)是在许多植骨环境中的有效疗法。骨髓抽吸物(BMA)也已用作可移植成骨结缔组织祖细胞的来源。这项研究旨在表征包含rhBMP-2 / ACS的脚手架的性能,其中海绵包裹着磷酸三钙羟基磷灰石颗粒(rhBMP-2 / ACS / TCP-HA),并测试了添加BMA的假说。在犬股骨多缺陷模型中改善这种构造的性能。在每个受试者中,两个部位移植有BMA血块的rhBMP-2 / ACS / TCP-HA支架,另外两个部位移植有伤口血(WB)的rhBMP-2 / ACS / TCP-HA支架。校正未吸收的TCP-HA颗粒后,用rhBMP-2 / ACS / TCP-HA + BMA和rhBMP-2 / ACS / TCP-HA + WB移植的部位相似,平均骨体积百分比为10.9%±1.2和11.2 %分别为1.2。在定量组织形态学上未见差异。虽然使用这两种构建体形成的骨均很坚固,但该研究不支持以下假设:未经处理的骨髓穿刺凝块的添加可改善植入rhBMP-2 / ACS / TCP-HA + BMA的部位的骨再生。与使用该模型的先前研究相比,TCP-HA分布在缺损中心的新骨形成更大。这一发现表明,rhBMP-2与移植物结构的中心放置的陶瓷和细胞成分之间具有潜在的协同作用。进一步的优化可能还需要更均匀的TCP-HA分布,替代的细胞递送策略以及更严格的大型动物节段性缺损模型。

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