摘要
背景与目的:部分非霍奇金淋巴瘤(non-Hodgkin’s lymphoma,NHL)具有高表达环氧合酶-2(cyclooxygenase-2,COX-2)的特征,而后者与P-糖蛋白及Bcl-2表达相关,可能导致NHL对化疗耐药。本研究旨在探讨B细胞淋巴瘤细胞株中COX-2的表达以及选择性COX-2抑制剂塞来昔布增强淋巴瘤细胞对表柔比星抗肿瘤效应的敏感性及其可能机制。方法:用荧光定量PCR(q RT-PCR)及蛋白[质]印迹法(Western blot)分别检测Raji、Jeko-1和Namalwa等淋巴瘤细胞株以及正常人外周血B细胞的COX-2表达;以梯度浓度的塞来昔布作用于淋巴瘤细胞株,CCK-8方法检测细胞增殖的抑制程度,q RT-PCR检测各细胞株MDR-1 mRNA及Bcl-2 mRNA表达的变化;表柔比星单独或联合不同浓度的塞来昔布处理Raji细胞株72 h后,CCK-8方法分析塞来昔布对表柔比星的增敏作用。结果:各淋巴瘤细胞株及正常对照外周血B细胞均不表达COX-2。塞来昔布单药即可对各淋巴瘤细胞株产生程度不同的抗增殖效应;随着塞来昔布作用浓度的增加,除Jeko-1细胞不表达MDR-1外,其余细胞株MDR-1 mRNA及Bcl-2 mRNA表达水平逐渐下降;塞来昔布明显增强表柔比星对Raji细胞的抗肿瘤活性,两者之间具有协同作用。结论:选择性COX-2抑制剂塞来昔布下调B细胞淋巴瘤细胞株的MDR-1 mRNA及Bcl-2 mRNA水平,并且增强表柔比星对淋巴瘤细胞的抗肿瘤效应。
Background and purpose： It has been demonstrated that cyclooxygenase-2（COX-2） is overexpressed in some subtypes of non-Hodgkin＇s lymphoma（NHL）, and COX-2 correlates with the expression of P-glycoprotein and Bcl-2, which may contribute to chemotherapy-resistance in NHL. The purpose of this study was to investigate the expression of COX-2 in B-cell lymphoma cell lines and the potential mechanisms of celecoxib, a selective COX-2 inhibitor, to sensitize lymphoma cell lines to epirubicin. Methods： Quantitative fluorescent realtime poly-chain-reaction（q RT-PCR） and Western blot were employed to determine the expression of COX-2 in Raji, Jeko-1 and Namalwa cell lines, as well as in peripheral blood B cells from normal controls. Cell lines were treated with celecoxib at gradient concentrations, followed by the detection of cell viabilities by cell counting kit-8（CCK-8）. Meanwhile, the changes in expression of MDR-1 mRNA and Bcl-2 mRNA before and after celecoxib treatment were determined by q RT-PCR. Raji cells were treated with epirubicin alone or in combination with gradient concentrations of celecoxib for 72 h, then CCK-8 was used to analyze whether celecoxib sensitize Raji cells to epirubicin. Results： Neither lymphoma cell lines nor normal B cells expressed detectable COX-2 in this study. Celecoxib inhibited the proliferation of the 3 lymphoma cell lines, and the mRNA expressions of MDR-1 and Bcl-2 were decreased by celecoxib in a concentration-dependent manner, except for that MDR-1 was undetectable in Jeko-1 cells. In addition, celecoxib sensitized Raji cells to epirubicin, indicating a synergistic anti-tumor effect between the two agents. Conclusion： Selective COX-2 inhibitor celecoxib down-regulates the expressions of MDR-1 mRNA and Bcl-2 mRNA in B-cell-originated lymphoma cell lines, and sensitizes Raji cells to epirubicin.
出处
《中国癌症杂志》
CAS
CSCD
北大核心
2015年第6期433-438,共6页
China Oncology
基金
上海市自然科学基金(13ZR1405700)
