Anticancer effect of icaritin on human lung cancer cells through inducing s phase cell cycle arrest and apoptosis

Icaritin, a prenylflavonoid derivative from Epimedium Genus, has been shown to exhibit many pharmacological and biological activities. However, the function and the underlying mechanisms of icaritin in human non-small cell lung cancer have not been fully elucidated. The purpose of this study was to investigate the anticancer effects of icaritin on A549 cells and explore the underlying molecular mechanism. The cell viability after icaritin treatment was tested by MTT assay. The cell cycle distribution, apoptosis and reactive oxygen species（ROS） levels were analyzed by flow cytometry. The mRNA and protein expression levels of the genes involved in proliferation and apoptosis were respectively detected by RT-PCR and Western blotting. The results demonstrated that icaritin induced cell cycle arrest at S phase, and down-regulated the expression levels of S regulatory proteins such as Cyclin A and CDK2. Icaritin also induced cell apoptosis characterized by positive Hoechst 33258 staining, accumulation of the Annexin V-positive cells, increased ROS level and alteration in Bcl-2 family proteins expression. Moreover, icaritin induced sustained phosphorylation of ERK and p38 MAPK. These findings suggested that icaritin might be a new potent inhibitor by inducing S phase arrest and apoptosis in human lung carcinoma A549 cells.     

Fucoidan induces apoptosis of HepG2 cells by down-regulating p-Stat3

Summary： Fucoidan is one of the main bioactive components of polysaccharides. The current study was focused on the anti-tumor effects of fucoidan on human heptoma cell line HepG2 and the possible mechanisms. Fucoidan treatment resulted in cell cycle arrest and apoptosis of HepG2 cells in a dose-dependent manner detected by MTT assay, flow cytometry and fluorescent microscopy. The results of flow cytometric analysis revealed that fucoidan induced G2/M arrest in the cell cycle progression. Hoechst 33258 and Annexin V/PI staining results showed that the apoptotic cell number was increased, which was associated with a dose-dependent up-regulation of Bax and down-regulation of Bcl-2 and p-Stat3. In parallel, the up-regulation of p53 and the increase in reactive oxygen species were also observed, Which may play important roles in the inhibition of HepG2 growth by fucoidan. In the meantime, Cyelin B 1 and CDK1 were down-regulated by fucoidan treatment. Down-regulation of p-Stat3 by fucoidan resulted in apoptosis and an increase in ROS in response to fucoidan exposure. We therefore concluded that fucoidan induces apoptosis through the down-regulation of p-Stat3. These results suggest that fucoidan may be used as a novel anti-cancer agent for hepatocarcinoma.     

成人骨朗格罕斯细胞组织细胞增生症1例

1临床资料患者女,54岁。因腰痛近4个月,发现腰椎骨破坏1天为主诉于2012年11月14日入大连医科大学附属第二医院。入院前于门诊行腰椎CT检查发现腰椎骨质破坏,考虑骨髓瘤可能。病来患者无发热、盗汗,无明显消瘦,无胸痛胸闷,无咳嗽咳痰,     

亚慢性砷暴露对小鼠海马组织细胞凋亡的影响

目的观察亚慢性砷暴露致小鼠海马组织细胞凋亡作用,为探讨砷的神经毒性作用机制提供依据。方法昆明种小鼠40只,按体重将小鼠随机分为对照组、1 ppm、2 ppm和4 ppm三氧化二砷(As2O3)染毒组。通过自然饮用含不同浓度As2O3水的方式使小鼠砷暴露,连续染毒60 d。取海马组织,通过HE染色观察海马组织形态学变化,通过TUNEL和Hoechst双染以及透射电镜观察神经细胞凋亡。结果与对照组相比,染毒组小鼠的海马神经细胞出现肿胀,细胞核仁增多,细胞分布稀疏、排列紊乱。电镜下,可观察到染毒组小鼠的海马细胞出现膜皱缩,核仁消失,染色质凝聚、移动,分布于核周,进而裂解成几个碎片等凋亡细胞形态特征。TUNEL和Hoechst双染色分析结果显示,在染毒组小鼠海马切片可见凋亡染色阳性细胞,其凋亡指数显著高于对照组(P<0.01),且随着染毒剂量的增高而增多。结论亚慢性砷暴露可导致小鼠海马组织细胞凋亡。     

中药血必净对MODS大鼠ALT、CR变化的影响及意义

目的探讨中药血必净对MODS大鼠脏器功能改善及对炎症反应减轻的作用。方法将144只SD大鼠(雄性)采用随机化原则分成3组,即假手术对照组(对照组)(48只),MODS组(模型组)(48只),MODS+血必净组(48只)(实验组);每组大鼠再次随机化分为4组,即12 h、24 h、36 h和48 h组4个时间点,每组12只大鼠;每组大鼠于造模后各个时间点处死动物。取血测定丙氨酸转氨酶(ALT)、肌酐(CR)水平;留取肺、肝、肾组织标本行病理组织学检查。数据结果采用SPSS17.0统计软件进行统计学分析。结果与对照组比较,模型组及实验组大鼠各时间点ALT、CR水平明显增高,差异有显著性意义(P<0.05);与模型组比较,实验组ALT水平于24 h起明显下降,差异有显著性意义(P<0.05),CR水平于36 h起明显下降,差异有显著性意义(P<0.05);48 h大鼠肺、肝、肾器官的病理切片,实验组较模型组炎症浸润明显改善,出血、水肿及坏死明显减轻等。结论中药血必净能明显改善MODS大鼠肝肾功能,改善肺泡塌陷及肺泡间隔增厚,减少炎症细胞浸润,改善肝小叶结构紊乱,减轻肝细胞水肿及坏死,减轻肾小管及间质充血水肿等,保护肺,肝,肾等脏器。     

Rh弱D血型1例鉴定分析

1临床资料 患者,男性,75岁。因摔伤致右臂骨折于2010年10月入住大连医科大学附属第一医院。患有风湿性关节炎40余年,长期服用抗风湿性药物,无糖尿病,心脏病,无肝炎及结核,无输血史。     

急性心肌梗死直接PCI先行血栓抽吸对预后的影响

[目的]探讨急性ST段抬高型心肌梗死(STEMI)血栓病变的直接经皮冠状动脉介入治疗(prumary pecutaneous coronary intervention,PPCI)中,先行血栓抽吸与常规PCI两种治疗策略对患者预后的影响.[方法]2007年2月～2009年8月连续入院、诊断为急性STEMI并接受直接PC...     

强力霉素对糖尿病小鼠肌肉转染人胰岛素因的调控作用

[目的]研究强力霉素对糖尿病小鼠肌肉转染人胰岛素基因表达的调控作用.[方法]构建prTA - tet4 -rhINS质粒;以链脲佐菌素(streptozotocin,STZ)诱导昆明小鼠成糖尿病模型.采用电穿孔法转移质粒prTA - tet4 -rhINS,通过强力霉素(doxcycline,Dox)水给药/撤除以评价...     

帕瑞昔布钠麻醉前给药对甲状腺手术患者术后镇痛效果的临床观察

[目的]观察与评价甲状腺手术患者麻醉诱导前应用帕瑞昔布钠术后镇痛的效果.[方法]拟行择期全麻下甲状腺手术患者300例,年龄18～65岁,体重指数17～29kg/m2,性别不限,ASA分级Ⅰ或Ⅱ级,随机分为两组:生理盐水组(n=150),帕瑞昔布钠组(n=150).于麻醉诱导前5 min,生理盐水组,帕瑞昔布钠组分别经静...     

吸毒人员回归社会后的应对方式与生活质量——自我概念的中介作用

目的 本研究旨在探讨吸毒人员回归社会后的自我概念及应对方式是否会影响其生活质量。方法 在四川省成都市、德阳市、西昌市、宜宾市等地招募201名已回归社会的男性吸毒人员（平均年龄22.65±8.31岁，年龄16~59岁）进行调查。参与者完成田纳西自我概念量表（TSCS）、特质应对方式问卷（TCSQ）和药物成瘾者生命质量测定量表（QOL-DA）。结果 高自我概念组吸毒人员的积极应对得分和生活质量均高于低自我概念组，差异具有统计学意义（P<0.05）；吸毒人员的自我概念在积极应对与生活质量之间的中介效应值为0.224（95%CI:0.063~0.434），中介效应显著，占总效应的26.4%。结论 自我概念介导了回归社会的吸毒人员应对方式与生活质量之间的关系，应在学校和特定社区开展提高自我概念和应对技巧的培训。