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来自生物功能化同种异体移植物的双生长因子递送:VEGF和BMP-2的顺序释放以刺激同种异体移植物重塑。

Dual growth factor delivery from biofunctionalized allografts: Sequential VEGF and BMP-2 release to stimulate allograft remodeling.

作者信息

Sharmin Farzana, McDermott Casey, Lieberman Jay, Sanjay Archana, Khan Yusuf

机构信息

Department of Materials Science and Engineering, University of Connecticut, Storrs, Connecticut.

Institute for Regenerative Engineering, University of Connecticut Health Center, Farmington, Connecticut.

出版信息

J Orthop Res. 2017 May;35(5):1086-1095. doi: 10.1002/jor.23287. Epub 2017 Mar 23.

Abstract

Autografts have been shown to stimulate osteogenesis, osteoclastogenesis, and angiogenesis, and subsequent rapid graft incorporation. Large structural allografts, however, suffer from limited new bone formation and remodeling, both of which are directly associated with clinical failure due to non-unions, late graft fractures, and infections, making it a priority to improve large structural allograft healing. We have previously shown the osteogenic ability of a polymer-coated allograft that delivers bone morphogenetic protein-2 both in vitro and in vivo through both burst release and sustained release kinetics. In this study, we have demonstrated largely sequential delivery of bone morphogenetic protein-2 and vascular endothelial growth factor from the same coated allograft. Release data showed that loading both growth factors onto a polymeric coating with two different techniques resulted in short-term (95% release within 2 weeks) and long-term (95% release within 5 weeks) delivery kinetics. We have also demonstrated how released VEGF, traditionally associated with angiogenesis, can also provide a stimulus for allograft remodeling via resorption. Bone marrow derived mononuclear cells were co-cultured with VEGF released from the coated allograft and showed a statistically significant (p < 0.05) and dose dependent increase in the number of tartrate-resistant acid phosphatase-positive multinucleated osteoclasts. Functionality of these osteoclasts was assessed quantitatively and qualitatively by evaluating resorption pit area from both osteo-assay plates and harvested bone. Data indicated a statistically significant higher resorption area from the cells exposed to VEGF released from the allografts over controls (p < 0.05). These results indicate that by using different loading protocols temporal control can be achieved when delivering multiple growth factors from a polymer-coated allograft. Further, released VEGF can also stimulate osteoclastogenesis that may enhance allograft incorporation, and thus mitigate long-term clinical complications. © 2017 Orthopedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:1086-1095, 2017.

摘要

自体移植物已被证明能刺激骨生成、破骨细胞生成和血管生成,并随后实现移植物的快速融合。然而,大型结构性同种异体移植物存在新骨形成和重塑受限的问题,这两者都与临床失败直接相关,如骨不连、移植物后期骨折和感染,因此改善大型结构性同种异体移植物的愈合成为当务之急。我们之前已经证明了一种聚合物涂层同种异体移植物的成骨能力,该移植物通过爆发释放和持续释放动力学在体外和体内递送骨形态发生蛋白-2。在本研究中,我们证明了从同一涂层同种异体移植物中可实现骨形态发生蛋白-2和血管内皮生长因子的大量顺序递送。释放数据表明,采用两种不同技术将两种生长因子加载到聚合物涂层上可实现短期(2周内95%释放)和长期(5周内95%释放)的递送动力学。我们还证明了传统上与血管生成相关的释放型VEGF,也可通过吸收为同种异体移植物重塑提供刺激。将骨髓来源的单核细胞与从涂层同种异体移植物释放的VEGF共培养,结果显示抗酒石酸酸性磷酸酶阳性多核破骨细胞数量有统计学意义的(p < 0.05)且呈剂量依赖性增加。通过评估骨分析板和收获骨的吸收坑面积,对这些破骨细胞的功能进行了定量和定性评估。数据表明,与对照组相比,暴露于同种异体移植物释放的VEGF的细胞的吸收面积有统计学意义的更高(p < 0.05)。这些结果表明,通过使用不同的加载方案,当从聚合物涂层同种异体移植物递送多种生长因子时可以实现时间控制。此外,释放的VEGF还可刺激破骨细胞生成,这可能增强同种异体移植物的融合,从而减轻长期临床并发症。© 2017骨科研究协会。由威利期刊公司出版。《矫形外科学研究》35:1086 - 1095,2017年。

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