摘要目的 探讨不同水平循环牵张应力对人退变椎间盘细胞增殖的影响.方法 取1例29岁手术切除的腰椎间盘突出患者的椎间盘,通过病理学方法评价其退变程度,酶消化法分离椎间盘纤维环细胞.选取P3代细胞,利用ElectroForce 3200力学试验仪搭载的BioDynamic生物反应舱系统,以3h为固定时间点对其进行不同水平的频率为0.25 Hz的周期性牵张应力刺激,设置形变量分别为0、5％、10％、15％和20％,应用流式细胞术检测不同应力刺激下纤维环细胞的增殖率变化情况,观察并探讨不同循环牵张应力对体外培养的人体退变椎间盘细胞的影响.结果 随着牵张应力的增加,纤维环细胞S期细胞比例和增殖指数(PI)呈缓慢上升趋势,15％时达到峰值,之后开始下降.结论 体外培养的人退变椎间盘纤维环细胞的增殖活性与受力大小有关且存在细胞增殖的最适应力条件；超过此应力范围,其增殖活性将会降低.

abstractsObjective To investigate the effects of different cyclic tensile strain on the proliferation of human anulus fibrosus cells from degenerated discs.Methods Anulus fibrosus(AF) cells were isolated from a degenerated human IVD,expanded in monolayer,and cyclically strained for 3 hours,applying 0,5％,10％,15％ and 20％ strains at a frequency of 0.25 Hz with the use of the DioDynamic test instrument.The flow cytometry method was used to examine the Af cells proliferation at 24 hours following application of the cyclic tensile strains.Results The proliferative index (PI) increased with the magnitude value of cyclic tensile strain except 20％ group.The most significant increase of proliferation index were found in 15％ group.Conclusion There might be some corelationships between magnitude of cyclic tensile strain and the proliferation of the degenerative AF cells.