This study was aimed to investigate the effect of curcumin in combination with bortezomib on the proliferation and apoptosis of human MM cell line H929 in vitro, and to explore its mechanisms. MTT assay was applied to detect the inhibitory effects of curcumin and bortezomib either alone or combined at different concentrations on H929 cells, and flow cytometry was employed to assay the apoptosis rate. In addition, RT-PCR was used to analyze the mRNA expression of gene BCL-2, BAX, cyclin DI. Immunofluorescence technique was performed to study the location changes of NF-κB P65 in different groups. The results showed that both curcumin and bortezomib inhibited the proliferation of MM cell line H929 in dose-dependent manner, and combination of these two drugs displayed synergistical effect. A much higher apoptosis rate was determined by flow cytometry in combinative groups than that in single or control group. And RT-PCR showed, as compared with curcumin or bortezomib group, there was mRNA expression decrease of BCL-2, cyclin DI but increase of BAX in combined group. The expression of NF-κB P65 in nucleus was downregulated in either the curcumin or bortezomib group, however, distribution of NF-κB P65 in cytoplasm was abserved in combined group. It is concluded that the combination of curcumin and bortezomib is much more effective for the inhibiting proliferation and promoting apoptosis of H929 cell line, which may function by inhibiting the transcription of NF-κB and apoptosis-related genes.%本研究旨在探讨姜黄素(curcumin)联合硼替佐米(bortezomib)对人多发性骨髓瘤(multiple myeloma,MM)细胞系H929细胞增殖和凋亡的影响,并进一步探讨其作用的相关机理.采用MTT法检测不同浓度的姜黄素和硼替佐米单用或联合应用对H929细胞的增殖抑制作用;采用流式细胞术(FCM)分析单用和联合用药时细胞的凋亡比率;采用RT-PCR法分析凋亡相关基因BCL-2、BAX及细胞周期相关蛋白cyclin D1的表达变化;采用免疫荧光染色法测定不同处理组NF-KB P65蛋白的分布变化.结果表明:姜黄素和硼替佐米单用及联合应用时均可抑制H929细胞的生长,呈剂量依赖性,联合用药在一定浓度范围内有协同效应;联用组细胞凋亡的比例明显高于单用组及对照组;与单用组相比,联用组cyclin D1,BCL-2基因表达下降,BAX升高.核因子NF-KB P65在单用组的胞核内的表达减弱,联合应用组NF-KB P65蛋白分布于胞浆.结论:姜黄素与硼替佐米均可抑制H929细胞的生长增殖、促进凋亡,联合应用有协同效应.抑制核因子NF-KB的转录及影响其调节凋亡相关基因可能是作用机制之一.
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