两种人工合成骨形态发生蛋白活性多肽的骨诱导能力

Two kinds of synthesized bone morphogenetic protein active polypeptides:evaluation of osteoinductive activity

背景:根据骨形态发生蛋白氨基酸序列中诱导成骨的核心功能区,课题组采用人工固态合成法合成了骨形态发生蛋白活性多肽Ⅰ与骨形态发生蛋白活性多肽Ⅱ。目的:初步评价骨形态发生蛋白多肽Ⅰ和骨形态发生蛋白活性多肽Ⅱ在动物体内的骨诱导能力。方法:将42只SD大鼠随机均分为7组,分别在臀部肌肉内植入载0.2,0.4,0.8 g/L骨形态发生蛋白多肽Ⅰ的羟基磷灰石/聚乳酸材料、载0.2,0.4,0.8 g/L骨形态发生蛋白多肽Ⅱ的羟基磷灰石/聚乳酸材料及羟基磷灰石/聚乳酸材料。植入后3,5周进行X射线、CT及组织学检测,观察7组成骨情况。结果与结论:载骨形态发生蛋白多肽羟基磷灰石/聚乳酸材料植入后3,5周的局部成骨均高于羟基磷灰石/聚乳酸材料组,说明两种多肽均具有一定的诱导成骨能力,且随着时间的增长效果更强;植入5周后,载0.4,0.8 g/L骨形态发生蛋白多肽Ⅰ组成骨效果高于载0.2 g/L骨形态发生蛋白多肽Ⅰ组、载0.2,0.4,0.8 g/L骨形态发生蛋白多肽Ⅱ组(P<0.05);载0.4 g/L骨形态发生蛋白多肽Ⅰ组与载0.8 g/L骨形态发生蛋白多肽Ⅰ组成骨效果无差异,表明骨形态发生蛋白多肽Ⅰ的诱导成骨能力强于骨形态发生蛋白多肽Ⅱ。

BACKGROUND：According to the core functional zone of amino acid sequence of the osteoinduction in bone morphogenetic proteins, our research group synthesized bone morphogenetic protein （BMP） active polypeptides Ⅰ and Ⅱ by artificial solid-state synthesis method. OBJECTIVE： To evaluate the osteoinductive ability of BMP active polypeptides Ⅰ and Ⅱ in animals. METHODS：Forty-two Sprague-Dawley rats were randomly divided into seven groups, and respectively implanted with hydroxyapatite/polylactic acid carrying 0.2, 0.4, 0.8 g/L BMP active polypeptides I, hydroxyapatite/polylactic acid carrying 0.2, 0.4, 0.8 g/L BMP active polypeptides Ⅱ, and hydroxyapatite/polylactic acid alone. At 3 and 5 weeks postoperatively, X-ray, CT and histological detection were conducted to evaluate osteoinductive conditions in the seven groups. RESULTS AND CONCLUSION：At 3 and 5 weeks postoperatively, there were better local osteoinductive effects in the groups hydroxyapatite/polylactic acid carrying BMP active polypeptides Ⅰ and Ⅱ than the group of hydroxyapatite/polylactic acid, indicating both two kinds of BMP active polypeptides possessed a certain osteoinductive ability. Moreover, this osteoinductive ability became stronger with time. At 5 weeks postoperatively, the osteoinductive effect in the 0.4 and 0.8 g/L BMP active polypeptides I groups was better than that in the 0.2 g/L BMP active polypeptides I group and the 0.2, 0.4 and 0.8 BMP active polypeptides Ⅱ groups （P 〈 0.05）. In addition, there was no difference in the osteoinductive effect of 0.4 and 0.8 g/L BMP active polypeptides I groups. These results indicate that BMP active polypeptides I has a stronger osteoinductive ability than BMP active polypeptides Ⅱ.