Thrombin's effects on osteoblastic cells. I. Cytosolic calcium and phosphoinositides.

Thrombin's effects on osteoblastic cells. I. Cytosolic calcium and phosphoinositides.
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凝血酶对成骨细胞的作用。

DOI:
10.1016/0006-291x(89)91691-4
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发表时间:
1989
影响因子:
3.1
通讯作者:
Dziak,R
Dziak,R
中科院分区:
生物学4区
文献类型:
--
作者:
Tatakis,DN;Dolce,C;Dziak,R

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凝血酶是一种凝血因子,已被证明是一种非常有效的体外骨吸收剂,其对成骨细胞的作用机制仍有待阐明。本研究观察了高纯度凝血酶对人成骨样骨肉瘤细胞系Saos-2和G292的作用。凝血酶(0.6-16 U/ml)引起成骨细胞增殖的显着,剂量依赖性增加。凝血酶还引起Saos-2和G292细胞中细胞溶质钙浓度的剂量依赖性增加(最大增加分别为基线的38%和200%)。添加凝血酶的成骨细胞样细胞导致磷酸肌醇水平显着的时间和剂量依赖性的变化:肌醇单磷酸水平的百分比下降,而肌醇二磷酸,肌醇三磷酸和肌醇四磷酸水平的百分比增加。磷脂酰肌醇水平变化的相对幅度与胞浆钙浓度变化相似。这些结果表明,凝血酶对骨细胞的作用机制可能涉及增加胞浆钙水平和磷酸肌醇代谢。
Thrombin, a blood coagulation factor, has been shown to be a very effectivein vitrobone resorbing agent whose mechanism of action on osteoblastic cells remains to be elucidated. In the present study, the effects of highly purified human thrombin on Saos-2 and G292 cells, two human osteoblast-like osteosarcoma cell lines, were investigated. Thrombin (0.6–16 U/ml) caused a significant, dose-dependent increase in osteoblastic cell proliferation. Thrombin also elicited a dose-dependent increase in cytosolic calcium concentration in both Saos-2 and G292 cells (maximal increases were 38% and 200% over baseline, respectively). Addition of thrombin to the osteoblast-like cells resulted in significant time- and dose-dependent changes in phosphoinositide levels: the percentage of inositol monophosphate levels were decreased, whereas the percentage of inositol bisphosphate, inositol trisphosphate and inositol tetrakisphosphate levels were increased. The relative magnitude of the changes in phosphoinositide levels was similar to the changes in cytosolic calcium concentration. These results suggest that thrombin's mechanism of action on bone cells may involve increases in cytosolic calcium levels and in phosphoinositide metabolism.
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发表时间: 1988
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影响因子: --
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发表时间: 1987
期刊: The Journal of biological chemistry
影响因子: --
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发表时间: 1978
影响因子: 15.9
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