大鼠颅骨矢状缝牵引成骨的体外研究(3)
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成骨细胞的生长过程一般是分化增殖、基质形成和基质钙化三个时期。I 型胶原分泌是骨基质形成的特征性表现[7]。I 型胶原免疫组化阳性染色位于颅缝内结缔组织,硬脑膜,骨膜,实验组与对照组比较无明显差异。RT-PCR结果显示,实验组第0.5h、3h、6 hI 型胶原 mRNA 表达量与对照组比较无统计学差异。因此,在力学刺激早期,可能尚未对成骨细胞的基质形成产生影响。
通过上述实验,我们认为大鼠颅骨骨缝器官可以在体外培养中成功存活并继续生长。外源机械张力可以扩宽骨缝,刺激成骨活动,可显著增加IGF-1的合成。
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[收稿日期]2008-03-26[修回日期]2008-06-19
编辑/张惠娟
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