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CHOm2细胞加雌二醇、ZDY101或等体积溶媒DMSO培养后通过3H-NMS结合反应测定M受体密度,并与同时加雌激素受体拮抗剂ICI-182780的细胞作对比.结果显示雌二醇组M受体密度为(123.7±23.9)fmol@mg-1,加ICI-182780后为(84.8±19.8)fmol@mg-1;相应的DMSO对照组为(89.6±22.9)fmol@mg-1,加ICI后为(66.9±22.5)fmol@mg-1;雌二醇组加ICI-182780后M受体密度降低的幅度远大于DMSO对照组.ZDY101组M受体密度为(147.3±36.9)fmol@mg-1,加ICI-182780后为(120.8±40.4)fmol@mg-1;相应的DMSO对照组为(95.9±24.0)fmol@mg-1,加ICI-182780后为(77.0±22.3)fmol@mg-1.表明雌激素和ZDY101都具有的提高M受体密度的功效,雌激素的药效可被ICI抑制,而ZDYl01的药效不被ICI抑制,说明ZDYl01有不同于雌激素的作用机制. 相似文献
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1976年我们与上海交大微机研究室合作成功地实现了YSJ-76液闪仪与Mic-80微机的配接工作,使仪器具有了数据处理和自动控制的功能。随着近年来放射免疫分析法和放射配基受体分析法的进展,对数据处理、质量控制提出了更高的要求。原来的液闪仪Mic-80系统的功能就显得有所不足,主要是数据不能保存,数据处理不够完善,此外操 相似文献
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[35S]-甲硫氨酸掺入法测定细胞Aβ分泌速率,观察知母活性成分ZMS和黄芪活性成分AST和HT,及两药合用对Aβ生成速率的影响.用[35S]-甲硫氨酸标记转染APP695基因的细胞,所获细胞上清以Aβ22-35单克隆抗体进行免疫共沉淀,结合Western印迹法,以配对对照(加载体)的Aβ条带灰度值为l,计算各用药组灰度的相对强度.本方法能稳定地测到细胞在24-72 h内分泌的Aβ量,同一受试样品在不同批实验中的变异(CV)在17%-32%之间.在培养液中中药活性成分的浓度为1×l0-5mo1/L时,受试物质中AST及ZMs AST合用对Aβ的分泌速率有明显抑制作用(P<0.01).另两种受试物则无作用.黄芪活性成分AsT有抑制Aβ分泌的作用,ZMs与AST两药合用作用更为显著. 相似文献
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A technique for studying in vivo the production rate and turnover rate constant of mouse brain M-receptors was established. A single injection of 25 mg / kg of Benzilylcholine Mustard to living mice resulted in 90 % irreversible block of brain M-receptors. The time course of the receptor density was then monitored by 3H-QNB binding assay and the production rate and turnover rate constant were calculated from the time course curve with a computer program. It was found that in normal mice the turnover rate constant was about 0.035 h-1 (half-life was about 20 h) and the production rate was 30-42 fmol / (h ·mg protein). Parallel experiments revealed a significant slow down of the turnover of brain M-receptors in hypothyroid mice (turnover rate constant was 0.0257±0.0012 h-1 in hypothyroid vs. 0.0356±0.0021 h-1 in normal) while the production rate was not changed significantly. The results suggest that thyroid hormones have a regulatory action on the turnover of brain M-receptors and the elevation of brain M-receptor density together with slow down of the turnover of brain M- receptors is probably one of the important mechanisms relevant to the brain dysfunction in hypothyroidism. 相似文献
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