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利用聚谷氨酸修饰的BMP2肽增强无机牛骨移植材料的再生潜力,该肽与含钙材料的结合能力得到改善。

Enhancement of the Regenerative Potential of Anorganic Bovine Bone Graft Utilizing a Polyglutamate-Modified BMP2 Peptide with Improved Binding to Calcium-Containing Materials.

作者信息

Bain Jennifer L, Bonvallet Paul P, Abou-Arraj Ramzi V, Schupbach Peter, Reddy Michael S, Bellis Susan L

机构信息

1 Department of Periodontology, University of Alabama at Birmingham , Birmingham, Alabama.

2 Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham , Birmingham, Alabama.

出版信息

Tissue Eng Part A. 2015 Sep;21(17-18):2426-36. doi: 10.1089/ten.TEA.2015.0160.

Abstract

Autogenous bone is the gold standard material for bone grafting in craniofacial and orthopedic regenerative medicine. However, due to complications associated with harvesting donor bone, clinicians often use commercial graft materials that may lose their osteoinductivity due to processing. This study was aimed to functionalize one of these materials, anorganic bovine bone (ABB), with osteoinductive peptides to enhance regenerative capacity. Two peptides known to induce osteoblastic differentiation of mesenchymal stem cells were evaluated: (1) DGEA, an amino acid motif within collagen I and (2) a biomimetic peptide derived from bone morphogenic protein 2 (BMP2pep). To achieve directed coupling of the peptides to the graft surface, the peptides were engineered with a heptaglutamate domain (E7), which confers specific binding to calcium moieties within bone mineral. Peptides with the E7 domain exhibited greater anchoring to ABB than unmodified peptides, and E7 peptides were retained on ABB for at least 8 weeks in vivo. To assess the osteoinductive potential of the peptide-conjugated ABB, ectopic bone formation was evaluated utilizing a rat subcutaneous pouch model. ABB conjugated with full-length recombinant BMP2 (rBMP2) was also implanted as a model for current clinical treatments utilizing rBMP2 passively adsorbed to carriers. These studies showed that E7BMP2pep/ABB samples induced more new bone formation than all other peptides, and an equivalent amount of new bone as compared with rBMP2/ABB. A mandibular defect model was also used to examine intrabony healing of peptide-conjugated ABB. Bone healing was monitored at varying time points by positron emission tomography imaging with (18)F-NaF, and it was found that the E7BMP2pep/ABB group had greater bone metabolic activity than all other groups, including rBMP2/ABB. Importantly, animals implanted with rBMP2/ABB exhibited complications, including inflammation and formation of cataract-like lesions in the eye, whereas no side effects were observed with E7BMP2pep/ABB. Furthermore, histological analysis of the tissues revealed that grafts with rBMP2, but not E7BMP2pep, induced formation of adipose tissue in the defect area. Collectively, these results suggest that E7-modified BMP2-mimetic peptides may enhance the regenerative potential of commercial graft materials without the deleterious effects or high costs associated with rBMP2 treatments.

摘要

自体骨是颅面和骨科再生医学中骨移植的金标准材料。然而,由于获取供体骨存在相关并发症,临床医生常使用商业移植材料,而这些材料可能因加工过程而失去骨诱导活性。本研究旨在用骨诱导肽对其中一种材料——无机牛骨(ABB)进行功能化处理,以增强其再生能力。评估了两种已知可诱导间充质干细胞向成骨细胞分化的肽:(1)DGEA,I型胶原中的一个氨基酸基序;(2)一种源自骨形态发生蛋白2的仿生肽(BMP2pep)。为实现肽与移植材料表面的定向偶联,对肽进行了工程改造,使其带有一个七谷氨酸结构域(E7),该结构域可特异性结合骨矿物质中的钙部分。带有E7结构域的肽比未修饰的肽在ABB上的锚定作用更强,且E7肽在体内至少8周内都保留在ABB上。为评估肽偶联的ABB的骨诱导潜力,利用大鼠皮下袋模型评估异位骨形成情况。还植入了与全长重组骨形态发生蛋白2(rBMP2)偶联的ABB作为利用被动吸附在载体上的rBMP2进行当前临床治疗的模型。这些研究表明,E7BMP2pep/ABB样本诱导形成的新骨比所有其他肽都多,且与rBMP2/ABB诱导形成的新骨量相当。还使用下颌骨缺损模型来检查肽偶联的ABB的骨内愈合情况。通过用(18)F-NaF进行正电子发射断层扫描成像在不同时间点监测骨愈合情况,发现E7BMP2pep/ABB组的骨代谢活性比所有其他组都高,包括rBMP2/ABB组。重要的是,植入rBMP2/ABB的动物出现了并发症,包括炎症和眼部白内障样病变的形成,而E7BMP2pep/ABB未观察到副作用。此外,对组织的组织学分析表明,带有rBMP2的移植物(而非E7BMP2pep)在缺损区域诱导形成了脂肪组织。总体而言,这些结果表明,E7修饰的BMP2模拟肽可能增强商业移植材料的再生潜力,而不会产生与rBMP2治疗相关的有害影响或高成本。

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