汉黄芩素对卵巢癌HO—8910细胞增殖及凋亡的影响
2015-03-13陈丽君等
陈丽君等
[摘要] 目的 探讨汉黄芩素对人卵巢癌HO-8910细胞增殖、凋亡的影响,并分析可能的作用机制。 方法 采用不同浓度(0、20、50、80、100、130 μg/mL)的汉黄芩素处理人卵巢癌HO-8910细胞,48 h后分别用MTT法检测细胞活力的变化,Annexin Ⅴ/PI双染法检测细胞凋亡的变化,Western blotting分析p21、cyclin B1、p53和Bax蛋白的表达水平。 结果 随着处理浓度的增加,汉黄芩素剂量依赖性地抑制人卵巢癌HO-8910细胞的增殖(P < 0.05),同时诱导细胞大量凋亡。进一步分析证实,汉黄芩素能够剂量依赖性地下调细胞周期相关蛋白cyclin B1的表达,同时上调p21的表达(P < 0.05),提示汉黄芩素可通过抑制细胞有丝分裂进程来抑制细胞的增殖。此外,汉黄芩素还能显著诱导p53通路的活化及其下游促凋亡分子Bax的表达(P < 0.05);而用p53通路抑制剂PFT-α预处理能够显著性降低汉黄芩素诱导的促卵巢癌细胞的凋亡效应(P < 0.05)。 结论 汉黄芩素能通过抑制细胞有丝分裂进程及调控p53促凋亡通路的活化来抑制卵巢癌细胞的增殖,同时显著诱导细胞大量凋亡,提示汉黄芩素可能具有一定的抗卵巢癌活性,从而为进一步探讨其作为临床治疗卵巢癌的潜在药物奠定理论基础。
[关键词] 卵巢癌;汉黄芩素;增殖;凋亡;细胞周期
[中图分类号] R737.31 [文献标识码] A [文章编号] 1673-7210(2015)02(b)-0004-05
[Abstract] Objective To explore the role and underlying molecular mechanism of wogonin on the proliferation and apoptosis of ovarian carcinoma HO-8910 cells. Methods Following the stimulation with various doses of wogonin (0, 20, 50, 80, 100, 130 μg/mL) for 48 h, MTT colorimetry was used to detect cell proliferation rate. Cell apoptosis was analyzed using double staining with Annexin Ⅴ and propidium iodide (Annexin Ⅴ/PI). The expression levels of p21, cyclin B1, p53 and Bax were assessed by Western blotting. Results Wogonin dampened ovarian carcinoma HO-8910 cell proliferation and promoted the apoptosis rates in a dose-dependent manner (P < 0.05). Moreover, wogonin dose-dependently down-regulated the expression levels of cell cycle protein cyclin B1, as well as the up-regulation of p21 expression levels (P < 0.05), suggesting that wogonin might inhibit cell growth by suppressing cell cycle. Additionally, an obvious increase in p53 and its downstream Bax was observed in HO-8910 cell stimulated with wogonin statistically (P < 0.05). However, this up-regulation was dramatically attenuated when preconditioning with p53 inhibitor PFT-α (P < 0.05). Conclusion Wogonin can abrogate HO-8910 cell proliferation and enhance cell apoptosis by regulating cell mitosis and apoptosis-related p53 pathway, implying as potential suppressor for ovarian cancer. Therefore, this study will support its potential targets for further development of anti-ovarian cancer therapy.
[Key words] Ovarian cancer; Leptin; Proliferation; Apoptosis; Cell cycle
汉黄芩素(wogonin,别名5,7-二羟基-8-甲氧基-2-苯基-4H-1-苯并呋喃-4-酮)是从中药黄芩根及半枝莲中提取的活性物质,具有抗病毒、抗菌、保护血管、降血脂及利胆、解痉等生物活性[1-4]。近年来,汉黄芩素在抗肿瘤中的作用得到广泛关注。研究表明,汉黄芩素能够有效地抑制多种癌细胞的生长,同时诱导肿瘤细胞的大量凋亡[4-5]。但是,汉黄芩素对卵巢癌细胞的影响及其机制尚不清楚。因此,本研究体外观察汉黄芩素对卵巢癌细胞HO-891增殖及凋亡的影响,并探讨相关的作用机制,从而为进一步探讨其在临床中的应用提供理论依据。
1 材料与方法
1.1 材料
人卵巢癌HO-8910细胞株购自南京凯基生物科技发展有限公司;胎牛血清和MTT购自华美生物工程有限公司;p53抑制剂PFT-α购自Calbiochem公司;Annexin Ⅴ/PI双染凋亡检测试剂盒购自BD公司;兔抗人p53、p21和Bax多克隆抗体均购自美国Santa Cruz公司;兔抗人cyclin B1抗体和小鼠抗兔-HRP标记抗体均购自Cell Signaling公司。
1.2 方法
1.2.1 细胞培养与处理 将人卵巢癌HO-8910细胞株置于含10%灭活胎牛血清、100 U/mL青霉素和100 g/mL链霉素的RPMI1640培养基中,37℃、5%CO2孵箱中培养。……
