染料木黄酮对培养的人视网膜色素上皮细胞增生和凋亡的影响

目的 观察不同浓度染料木黄酮对培养的人视网膜色素上皮细胞(RPE)的增生和凋亡的影响。 方法 通过四唑溴盐(MTT)比色法和核仁嗜银蛋白(AgNORs)染色分析，观察不同浓度(5、10、25、50、75、100 mg·L^-1)染料木黄酮作用12、24、48、72 h后对RPE细胞增生的影响。通过末端脱氧核苷酸转移酶介导的缺口末端标记(TUNEL)染色与光学显微镜和透射电子显微镜的形态学观察，研究其对RPE细胞凋亡的诱导作用，并与正常培养的人RPE细胞对照比较。 结果 25、50、75、100 mg·L^-1浓度的染料木黄酮可抑制RPE的增生，抑制率为12.0%~64.6%,与正常RPE细胞相比，差异有显著性的意义(P＜0.05)；随药物剂量的增加和作用时间的延长细胞核内AgNORs数量减少。TUNEL染色结果显示，50 mg·L^-1染料木黄酮作用24、48和72 h后，RPE细胞的凋亡百分数的中位数分别为7.6%、9.8%和13.7%。当浓度为75、100 mg·L^-1时，以上3个时间点凋亡细胞百分数的中位数分别为10.3%、16.4%和23.4%；15.4%，21.2%和35.8%。透射电子显微镜观察结果显示，50 mg·L^-1染料木黄酮作用48h后，RPE细胞核内呈现凋亡特征。 结论 不同浓度的染料 木黄酮可以抑制RPE细胞的增生，有剂量效应关系和时间效应关系；当达到一定浓度时，染料木黄酮可以诱导RPE凋亡的发生。 （中华眼底病杂志，2004，20：241-244）

Influence of genistein on proliferation and apoptosis of cultured human retinal pigment epithelial cells

Objective To investigate the effects of genistein with different concentration on proliferation and apoptosis of cultured human retinal pigment epithelial (RPE) cells in vitro. Methods The effect of genistein with the concentration of 5，10，25，50，75，and 100 mg·L^-1on the proliferation of cultured RPE was examined by tetrazolium salt (MTT) assay and AgNORs staining. The cell apoptosis was detected by terminal deoxynucleotidyl transferase-mediated deoxyuridine 5-triphosphate nick-end labeling (TUNEL) methods, in the mean time, the morphologic changes of cell apoptosis were observed by light microscopy and transmission electronic microscopy, the results of which were compared with the normal RPE cells. Results Genistein with the concentration of 25, 50, 75, and 100 mg·L^-1had a dose-dependent and time-dependent antiproliferative effects on RPE cells with the inhibitory rate of 12.0%-64.6% (P＜0.05). The results of AgNORs staining showed that the number of AgNORs in the nucleolus decreased when treated by genistein. In TUNEL staining, the median of percent of apoptotic RPE cells was 7.6%, 9.8%, 13.7% when treated with 50 mg·L^-1genistein, 10.3%, 16.4%, 23.4% when treated with 75 mg·L^-1genistein, and 15.4%, 21.2%, 35.8% when treated with 100 m g·L^-1genistein respectively for 24, 48, and 72 hours. After the treatme nt with 50 mg·L^-1genistein for 48 hours, the apoptosis in the nucleolus of RPE cells was found. Conclusions Genistein with different concentrations has a dose-dependent and time-dependent antiproliferative effect on RPE cells. Genistein can induce the apoptosis of RPE cells when it reaches a certain extent of concentration. (Chin J Ocul Fundus Dis，2004，20：241-244)