DEAB促进肝癌细胞凋亡及增强其对ADM敏感性的机制研究

目的探讨ALDH抑制剂DEAB致肝癌细胞凋亡及增强其对ADM化疗敏感性的具体机制。方法通过DEAB干预肝癌细胞系HepG2和正常肝细胞系L02以及与经ADM处理的HepG2和L02细胞。通过流式细胞仪检测各组细胞中活性氧(ROS)的表达变化及Annexin-V和PI双染后细胞凋亡量的变化。通过Realtime PCR及western blot方法检测各组细胞中Bcl-2、Bax、ALDH1以及MDR1基因和蛋白的变化。结果 DEAB干预HepG2细胞后,致使其ROS表达增强、凋亡量增加,ALDH1基因和蛋白表达无明显变化,Bcl-2、MDR1基因和蛋白表达下调,Bax基因和蛋白表达上调。正常肝细胞系L02无以上变化。结论抑制ALDH可致肝癌细胞系HepG2凋亡,并增强其对ADM的化疗敏感性。而对正常肝细胞系L02无此作用。

Physical and chemical properties of a durably efficacious ammonium bicarbonate as a fertilizer and its yield-increasing mechanism

A new fertilizer of cocrystal type,known as durably efficacious ammonium bicarbonate (DEAB),has been developed by adding a certain amount of dicyandiamide (DCD) as an ammonia-stabilizing agent to ammonium bearbenate(AB)during the process of its production.As compared with AB,DEAB was found to have a reduction of direct volatilization loss by 53%,a fertilizer availability period prolonged from 35-45 to 90-110 d,and an increase in the rate of nitrogen in fertilizer being utilized by 5.9%-10.2%,and a saving of the amount of fertilizer to be ap-phed by 20%-30% for the same level of yield,or an increase of the crop yield by over 10% for the same level of ni-tregen fertilization;in addition,it was found to show usually a function of promoting the crop to early mature.It can be apptied as basal dressing all in one time to soil and thus also used as a labour-saving and crop yield-increasing fertil-izer for is non-mtertillage,plastics film covering and water-saving