Objective To investigate the inhibitive effect of E2F decoy oligodeoxynucleotides (E2F decoy ODNs) on cultured human retinal pigment epithelial (HRPE) cells.Methods E2F decoy ODNs or scramble decoy ODNs at varied concentrations were put into the HRPE cells mediated by lipofectamineTM2000. The proliferative activity of HRPE was detected by methythiazolyl-terazollium assay, and the competitive combinative activity of E2F decoy ODNs and transcription factor E2F was detected by electrophoresis mobility-shift assay. Results The proliferation of HRPE was inhibited markedly by E2F decoy ODNs at the concentration of 0.2 μmol/L (P=0.002) in a dose-dependent manner but not by scrambled decoy. The results of electrophoresis mobility-shift assay showed that the combinative activity of transcription factor E2F was abolished completely by E2F decoy ODNs. Conclusions E2F decoy ODNs may sequence-specifically inhibit the combinative activity of transcripti on factor E2F,and inhibit the proliferation of HRPE cells.(Chin J Ocul Fundus Dis，2004，20：182-185)
Objective To explore the expression and activation of transcription factor E2F1 in cultured human retinal pigment epithelium (RPE) cells. Methods Cultured human RPE cells were divided into two groups after synchronization: one was cultured in Dulbecco′s modified Eagle′s medium (DMEM) without serum; the other was cultured in DMEM supplemented with 20% serum of newborn calf. The expressions of E2F1 protein in two groups were detected by Western blot analysis. The E2F1-DNA binding activities were measured by gel mobility-shift assay(EMSA). Results E2F1 protein of 60 000 molecular weight was detected in the nuclear extract of human RPE cells, and serum stimulation could increase its expression（P＜0.001）. EMSA exhibited the increased binding activity of E2F1 in the serum-stimulated RPE cells with DNA. Conclusions E2F1 is expressed in the nuclei of human RPE cells. Serum stimulation can increase its protein expression as well as binding activity, so as to play a regulation role of gene transcription. (Chin J Ocul Fundus Dis, 2002, 18: 224-226)
目的:探讨COPD(慢性阻塞性肺病)并自发性气胸的临床特点、治疗及预后。方法:对2001年1月至2008年12月间本院收治的48例COPD并自发性气胸患者进行临床分析。结果:48例COPD并自发性气胸患者临床表现多样,首次确诊率不到80%,死亡率8.25%,单纯抽气治愈10例,胸腔闭式引流治愈22例。胸腔闭式引流+负压吸引治愈15例,手术治疗1例。肺复张平均天数单纯抽气10天, 胸腔闭式引流9天, 胸腔闭式引流+负压吸引7天, 手术治疗15天.结论:COPD并自发性气胸治疗多需排气减压术,复张时间较长,治疗以胸腔闭式引流+负压吸引为宜。