鸢尾异黄酮提取工艺研究及含量测定

目的:研究鸢尾中异黄酮的提取工艺及含量测定方法.方法:采用正交试验进行优选,考察乙醇用量、乙醇浓度、提取次数、提取时间等因素对异黄酮得率的影响,并采用紫外分光光度法测定其含量.结果:乙醇用量和提取次数是主要的影响因素.鸢尾最佳提取工艺为药材粉碎为20目,加入10倍量80%的乙醇于85℃重复提取2次,每次1 h.结论:本提取工艺可行;紫外分光光度法简单、快速、准确.     

甘肃产当归的商品规格与其阿魏酸含量的相关性初探

采用高效液相色谱法测定不同商品规格的甘肃产当归中阿魏酸含量,对当归的商品规格与阿魏酸含量的关系进行初步探索.结果表明:当归的商品规格等级高低与阿魏酸含量之间无明显相关性.     

柿叶黄酮抑制LDL刺激的大鼠血管平滑肌细胞增殖

目的:观察柿叶黄酮对低密度脂蛋白(LDL)刺激时离体大鼠胸主动脉血管平滑肌细胞增殖的影响.方法:体外培养大鼠主动脉血管平滑肌细胞,LDL刺激时,应用不同剂量的柿叶黄酮作用24 h后,采用MTS/PES法确定血管平滑肌细胞的增殖状态.结果:与对照组相比,LDL可以明显刺激大鼠血管平滑肌细胞的增殖,柿叶黄酮对LDL刺激下的大鼠血管平滑肌细胞增殖具有明显的抑制作用(P＜0.05),并呈现剂量依赖性.结论:柿叶黄酮可明显抑制LDL刺激下的大鼠血管平滑肌细胞增殖.     

FGF and ERK signaling coordinately regulate mineralization-related genes and play essential roles in osteocyte differentiation

To examine the roles of FGF and ERK MAPK signaling in osteocyte differentiation and function, we performed microarray analyses using the osteocyte cell line MLO-Y4. This experiment identified a number of mineralization-related genes that were regulated by FGF2 in an ERK MAPK-dependent manner. Real-time PCR analysis indicated that FGF2 upregulates Ank, Enpp1, Mgp, Slc20a1, and Dmp1 in MLO-Y4 cells. Consistent with this observation, the selective FGF receptor inhibitor PD173074 decreased Ank, Enpp1, Slc20a1, and Dmp1 mRNA expression in mouse calvaria in organ culture. Since Dmp1 plays a central role in osteocyte differentiation and mineral homeostasis, we further analyzed FGF regulation of Dmp1. Similar to FGF2, FGF23 upregulated Dmp1 expression in MLO-Y4 cells in the presence of Klotho. Furthermore, increased extracellular phosphate levels partially inhibited FGF2-induced upregulation of Dmp1 mRNA expression, suggesting a coordinated regulation of Dmp1 expression by FGF signaling and extracellular phosphate. In MLO-Y4 osteocytes and in MC3T3E1 and primary calvaria osteoblasts, U0126 strongly inhibited both basal expression of Dmp1 mRNA and FGF2-induced upregulation. Consistent with the in vitro observations, real-time PCR and immunohistochemical analysis showed a strong decrease in Dmp1 expression in the skeletal elements of ERK1 ^−/− ; ERK2 ^flox/flox ; Prx1-Cre mice. Furthermore, scanning electron microscopic analysis revealed that no osteocytes with characteristic dendritic processes develop in the limbs of ERK1 ^−/− ; ERK2 ^flox/flox ; Prx1-Cre mice. Collectively, our observations indicate that FGF signaling coordinately regulates mineralization-related genes in the osteoblast lineage and that ERK signaling is essential for Dmp1 expression and osteocyte differentiation.     

EEN - B1 与肿瘤关系的研究进展简

EEN—B1（extra eleven nineteen B1）是一种新的抑癌基因，EEN—B1蛋白参与了囊泡形成、细胞的增殖和分化、细胞内吞、突触重建以及信号传导等，它的多种生物学功能主要表现在通过SH3结构域与其他下游蛋白相结合。EEN—B1有可能成为肿瘤诊断和判定疗效的生物学标记。