Effects of Pulsed Electric Fields on DNA Synthesis in an Osteoblast-Like Cell Line (UMR-106)

WTFZ] The study of the bioeffects of electromagnetic fields (EMFs) is an important national task in biological physics. Using EMFs to treat bone diseases involves electrical technology, biology, and medicine. But the effects of EMFs are still controversial and the mechanisms are not yet clear. Therefore, more effect is needed to detect the effects at the cellular and molecular levels. This paper investigates the effects of low-energy, low-frequency pulsed capacitively coupled electric fields (PCCEFs) on DNA synthesis in UMR-106 osteoblast-like cells. The equipment can generate 25250Hz frequency, 0300V amplitude and 0.2ms pulse width signal. DNA synthesis is judged by the uptake of 3 H-thymidine ( 3 H-TdR). The results showed that the response of UMR-106 cells to electric field exposure are characterized by: (a) a frequency window for increased DNA synthesis, with a peak near 125Hz; (b) decreased synthesis with increasing electric intensity with repression at 100V/cm and 25Hz.[

鹿茸粗提液对大鼠成骨肉瘤细胞增殖的调节作用

目的 :观察鹿茸粗提液 (PAE)对大鼠成骨肉瘤细胞系UMR 10 6增殖的影响 ,从而为研究鹿茸强筋健骨的分子机理以及筛选鹿茸防治骨质疏松的生物活性成分提供实验依据。方法 :通过SephacrylS 2 0 0HR凝胶过滤色谱对PAE进行初级分离 ,用MTT法检测不同分离组分对UMR 10 6细胞增殖的影响。结果 :发现SephacrylS 2 0 0HR凝胶过滤色谱第 2峰P2次组分 ,当其蛋白质浓度高于 0 .972mg·L - 1并低于 97.2mg·L - 1时 ,对UMR 10 6细胞增殖活性的影响表现为抑制 ;若浓度达到 97.2mg·L- 1后则会促进细胞的增殖 ,且增殖效应随蛋白质浓度的增加而明显上升。当样品蛋白质浓度达到 9.72g·L- 1时 ,相应的细胞增殖率为 477.92 % ,接近PAE的增殖水平 (499.62 % )。经SDS PAGE电泳分析第 2峰分子量集中于 59kDa左右。此外 ,发现第 3、第 4和第 5峰对UMR 10 6细胞增殖有显著的抑制作用。结论 :鹿茸蛋白中含有多种双向调控UMR 10 6细胞增殖的生物活性因子 ,既有剂量双向效应 ,也有与分子量相关的不同调控蛋白 。