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- 2018
A结构域阳性纤维连接蛋白促进破骨细胞形成及根尖囊肿骨质破坏
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Abstract:
摘要 目的: 检测纤维连接蛋白(fibronectin, FN)可变剪接亚型蛋白在根尖囊肿纤维囊壁中的表达,研究每种亚型在体外诱导形成破骨细胞的能力,探讨FN的可变剪接亚型与根尖囊肿病变的进展和骨破坏的关系。方法: 选择8例经病理诊断确诊为根尖囊肿患者手术标本,采用免疫组织化学方法,研究每种FN亚型在病变组织中表达强度,分离成纤维细胞,采用反转录-聚合酶链反应(reverse transcription-poymerase chain reaction, RT-PCR)方法检测总FN及其3种亚型(EDA+FN、EDB+FN、CS1-FN)mRNA的表达水平,并采用条件培养基体外诱导破骨细胞分化。根据每种FN亚型的相对表达情况,研究FN亚型与破骨细胞分化之间的关系。结果: 在FN产生的亚型中,含蛋白结构域A的纤维连接蛋白(EDA+FN)在纤维囊壁中染色强度高于EDB+FN和CS1-FN。囊壁成纤维细胞中,EDA + FN的mRNA水平显著高于EDB+FN (P=0.007) 和 CS1-FN (P=0.003),且EDA+FN/总FN值在成纤维细胞的所有亚型中都是最高的(EDB+FN/总FN,P<0.001 ;CS1-FN/总FN,P<0.001)。体外诱导破骨细胞形成结果显示,EDA+FN/总FN与破骨细胞生成数量呈正相关(R=0.776, P=0.024)。结论: 根尖囊肿囊壁成纤维细胞产生各种FN亚型, EDA+FN为主要类型,且EDA+FN/总FN与成纤维细胞诱导破骨细胞效率呈正相关。提示成纤维细胞产生的EDA+FN有利于导致微环境中破骨细胞形成,促进根尖囊肿的骨破坏
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