頻率對(duì)拉伸應(yīng)變誘導(dǎo)成骨細(xì)胞凋亡的影響
[Abstract]:Objective to investigate the effect of frequency on the apoptosis of osteoblasts induced by tensile strain. Methods Flexcell mechanical loading system was used to induce 1% biaxial tensile strain on mouse preosteoblast MC3T3-E1. The frequency of the strain was 1h / d for 1 h / d and 4 Hz, / d for intermittent stretching. The cell death rate was detected by measuring the activity of lactate dehydrogenase (LDH), the apoptosis was observed by Annexin V-FITC/PI flow cytometry, and the levels of caspase-3,-9 and Bcl-2,Bax genes were detected by real-time PCR. The expression of caspase-3,-9 protein was detected by Western blotting. Results the LDH activity of osteoblasts was not affected by different loading frequency. There was no significant difference in the overall apoptosis rate of osteoblasts by flow cytometry at different frequencies, but 2 Hz frequency could induce early apoptosis of osteoblasts, 2 Hz stretch strain could obviously up-regulate the expression of caspase-3,-9 gene and protein, and up-regulate the ratio of Bax/Bcl2 protein. Conclusion 1% biaxial tensile strain can not induce apoptosis and death of osteoblasts at 1 Hz frequency, but 2 Hz frequency can induce early apoptosis of osteoblasts, which can be achieved by upregulating the expression of Bax/Bcl-2.
【作者單位】: 武警后勤學(xué)院;武警陜西總隊(duì)銅川支隊(duì)衛(wèi)生隊(duì);
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(11302262)
【分類(lèi)號(hào)】:R82
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