These cells were pretreated with BSO for 24 h and then with AZA for different times. We examined the effects of this combination on some proteins and on cellular death. We also studied the eff icacy and the safety of AZA (6 mg/kg per day) and BSO (90 mg/kg per day) 寻找更多 in HepG2 tumor growth in vivo using athymic mice. We measured safety by serological markers such as aminotransferases and creatine kinase.RESULTS: The in vitro studies revealed a new mechanism of action for the

AZA plus BSO combination in the cancer cells compared with other thiopurines (6-mercaptopurine, 6-methylmercaptopurine, 6-thioguanine and 6-methylthioguanine) in combination with BSO. The cytotoxic effect of AZA plus BSO in HepG2 cells resulted from necroptosis induction in

a mitochondrial-dependent manner. From kinetic studies we suggest that glutathione (GSH) depletion stimulates c-Jun amino-terminal kinase and Bax translocation in HepG2 cells with subsequent deregulation of mitochondria (cytochrome c release, loss of membrane potential), and proteolysis activation leading to loss of membrane integrity, release of lactate dehydrogenase and DNA degradation. Some of this biochemical and cellular changes could be reversed by N-acetylcysteine (a GSH replenisher). In vivo studies showed that HepG2 tumor growth was inhibited when AZA was combined with BSO.CONCLUSION: Our studies suggest that a combination of AZA plus BSO could be useful for localizedtreatment of hepatocellular carcinoma as in the currently used transarterial

chemoembolization Stem Cell Compound Library method.
目的:探讨利用p38抑制剂SB203580(SB)抑制p38通路对6Gy受照小鼠免疫细胞辐射损伤的作用。方法:取雄性C57BL/6小鼠30只,随机分为对照组、照射组和SB组,每组10只。SB组和照射组小鼠接受以6Gy137Csγ射线的全身照射。SB组小鼠照射24h后腹腔注射SB(15mg/kg),每2d1次,共给药5次,其余2组小鼠腹腔注射对照溶液。小鼠受照10d后处死,取外周血计数,流式细胞仪检测CD4、CD8、B220表达,取骨髓细胞测定ROS水平。结果:照射组外周血白细胞(WBC)、CD8、B220细胞比例较对照组明显下降,骨髓ROS水平升高(P<0.01)。SB组外周血CD8比例较照射组上升,骨髓ROS水平下降(P<0.01)。结论:SB对小鼠6Gy照射后造血免疫损伤有一定的缓解作用,其机制可能与其降低照射后骨髓细胞ROS水平有关。
目的:探讨葡萄籽提取物原花青素对隐睾生精细胞凋亡的影响,为临床治疗某些特发性男性不育症药物的开发研究提供实验依据。方法:将雄性健康SD大鼠40只随机分为隐睾+原花青素(高、中、低剂量)组、隐睾+生理盐水组、假手术组5组,每组8只大鼠,每天定时定量灌胃3次,7天后断颈处死大鼠,双侧睾丸称湿重并取手术侧睾丸HE染色观察组织学变化,TUNEL法检测细胞凋亡。结果:与生理盐水组比较,原花青素各剂量组的生精细胞凋亡程度显著减轻(P<0.05),且呈剂量效应。结论:原花青素能够减轻雄性SD大鼠实验性隐睾生精细胞凋亡的程度。
Background Nutlin-3a售价 This study aimed to determine the effects of tumor necrosis factor(TNF-a) on endothelial cytoskeleton morphology and permeability,and to detect the underlying signaling mechanisms involved in these responses. Methods Cultured endothelial cells(ECs) were exposed to TNF-a,and EC cytoskeletal changes were evaluated by observing fluorescence of F-actin following ligation with labeled antibodies.Endothelial permeability was detected by measuring the flux of HRP-albumin across the EC monolayers.