4-Methylcoumarins with cytotoxic activity against T24 and RT4 human bladder cancer cell lines
作者:D. R. Vianna、L. Ruschel、F. Dietrich、F. Figueiró、F. B. Morrone、R. F. S. Canto、F. Corvello、A. Velho、A. Crestani、H. Teixeira、G. L. von Poser、A. M. O. Battastini、V. L. Eifler-Lima
DOI:10.1039/c5md00039d
日期:——
4-Methylcoumarins were synthesized by microwave-assisted synthesis via Pechmann condensation and their cytotoxic activity against human bladder cancer cell lines was investigated.
Synthesis of Novel 4-Methylcoumarins and Comparative Specificities of Substituted Derivatives for Acetoxy Drug: Protein Transacetylase
作者:Yogesh Kumar Tyagi
DOI:10.3797/scipharm.0805-08
日期:——
Our laboratory has been credited for the discovery of a unique membrane bound enzyme termed Acetoxy Drug: Protein Transacetylase (TAase) catalyzing the transfer of acetyl group from polyphenolic peracetates (PA) to certain functional proteins resulting in the modulation of their catalytic activity. In this report, we have synthesized eight novel 4-methylcoumarins and demonstrated the comparisons of acetoxy derivatives of 4-methylcoumarin with their propoxy and butoxy derivatives for the modulation of some receptor proteins such as cytochrome P-450 (Cyt.P-450), NADPH cytochrome c reductase and cytosolic glutathione S-transferase (GST). The results clearly indicated that acetoxy derivatives have very high efficacy for the modulation of above mentioned functional proteins as compared to their other derivatives. We have also compared the acetoxy derivatives of 4-methylcoumarin with their acid substituted acetoxy derivatives and found that inclusion of carboxylic acid groups on the benzenoid rings of the coumarins system hardly affected TAase mediated catalytic activity.
我们的实验室发现了一种独特的膜结合酶,称为乙酰氧基药物:蛋白质转乙酰化酶(TAase)催化乙酰基从多酚类过乙酸酯(PA)转移到某些功能蛋白质上,从而调节其催化活性。在本报告中,我们合成了八种新型 4-甲基香豆素,并比较了 4-甲基香豆素的乙酰氧基衍生物与其丙氧基和丁氧基衍生物对细胞色素 P-450 (Cyt.P-450)、NADPH 细胞色素 c 还原酶和细胞谷胱甘肽 S 转移酶 (GST) 等受体蛋白的调节作用。结果清楚地表明,与其他衍生物相比,乙酰氧基衍生物在调节上述功能蛋白方面具有非常高的功效。我们还比较了 4-甲基香豆素的乙酰氧基衍生物和它们的酸取代乙酰氧基衍生物,发现在香豆素系统的苯环上加入羧酸基团几乎不会影响 TAase 介导的催化活性。