静态拉伸应变对人牙周膜成纤维细胞的影响

The effects of static tensile strain on the cytoskeleton of human periodontal ligament fibroblasts

目的 :研究人牙周膜成纤维细胞 (PDLF)在机械拉伸应变作用下 ,细胞和细胞核投影面积及其细胞骨架的改变情况 ,探讨PDLF的形态、功能和应变之间的关系。方法 :采用自制的细胞体外静态机械加载装置用不同的拉伸应变量加力于细胞上 ,通过激光扫描共聚焦显微镜观察细胞骨架的形态及其改变情况 ,并进行统计分析。结果 :在 8%、12 %、16%力值组 ,细胞和细胞核投影面积随着加力时间和力值的增加而每天递增 ,肌动蛋白纤维也随之逐渐增粗 ,排列更有规律 ;而在 2 0 %力值组 ,其结果则反之。结论

Objective: To study the effects of static tensile strain on the cytoskeleton of human periodontal ligament fibroblasts (HPLFs). Methods: Tensile strain with the strain variate of 8%,12%,16% and 20% was applied in the culture of HPLFs for 1,2 and 3 d respectively with a self-devised loading apparatus. With the aid of laser scanning confocal microscope, the projected areas of each observed cell and its nuclear were calculated and the cell cytosketeton was observed. The data analysis was carried out with SPSS using Dunnett test. Results:The projected areas of the cells and nucleus incereased with the increace of loading time and tensile strain value in trial groups of 8%,12% and 16%(P<0.05), but decreased in group of 20% compared with those in group 16%.The actin fibers were thicker and more regularly arranged with the increace of loading time and strain. Conclusions: Static tensile strain may affect cytoskeleton of HPLFs.