摘要
目的研究不同强度的力学载荷对破骨细胞及其前体细胞增殖、分化和功能的影响。方法以破骨诱导液培养RAW264.7破骨前体细胞,同时施加3 d的周期性张应变,然后培养4 d;另外一组RAW264.7细胞以破骨诱导液培养4 d,将其诱导为破骨细胞,再施加3 d的周期性张应变。结果在不同张应变下,两组细胞增殖活性的变化大致相同,但细胞抗酒石酸酸性磷酸酶(tartrate-resistant acid phosphatage,TRAP)活性和破骨细胞(TRAP阳性多核细胞)数量的变化明显不同。在2 500με的中等强度张应变下,第1组的TRAP活性降幅和破骨细胞数量减幅均最高,而后者TRAP活性降幅和破骨细胞数量减幅均最低。结论不同张应变对分化初期破骨前体细胞和已分化出破骨细胞的破骨前体细胞的破骨分化和功能状态的影响有明显差异。
Objective To investigate the effect of mechanical loading with different magnitudes on the prolifera- tion, differentiation and activity of preosteoclasts and osteoclasts. Methods One group of RAW264.7 preoste- oclastic cells cultured in osteoclast inductive medium were subjected to the cyclic tensile strain for three days, and then cultured for four days; the other group of RAW264.7 cells were induced in osteoclast inductive medium for four days to be osteoclasts, then subjected to the cyclic tensile strain for three days. Results Under the tensile strain at different magnitudes, the proliferation variations in two groups of RAW264.7 cells were approximately i- dentical, but changes in the activities of tartrate-resistant acid phosphatage （TRAP） and numbers of TRAP-posi- tive multinucleated cells （osteoclasts） in the two groups were significantly different. Under the moderate tensile strain （2 500 ~）, the reduction of TRAP activity and osteoclasts number were both the highest in the first group, and both the lowest in the second group. Conclusions The influence of different tensile strain on osteoclast dif- ferentiation and osteoclastic activity of preosteoclasts in early differentiation is different to that of the preoste- oclasts already differentiated into osteoclasts.
出处
《医用生物力学》
EI
CAS
CSCD
北大核心
2012年第3期299-304,共6页
Journal of Medical Biomechanics
基金
国家自然科学基金重点资助项目(10832012)
关键词
破骨细胞
抗酒石酸酸性磷酸酶
周期性张应变
力学载荷
细胞增殖
细胞分化
Osteoclasts
Tartrate-resistant acid phosphatage （TRAP）
Cyclic tensile strain
Mechanical loading
Cell proliferation
Cell differentiation
