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张志华;张荣娟;韩凝;栗冲;王丽红;邢恩鸿;谷翠红;郝长来;律琦 《中华血液学杂志》2021,42(05):407-414
目的 明确硼替佐米和(或)西拉美新作用于多发性骨髓瘤(MM)细胞株后细胞增殖、转录因子EB(TFEB)核转位表达变化及自噬水平,为进一步探讨TFEB对自噬的调控机制提供依据。 方法 体外培养MM细胞株RPMI8226及U266,并以一定浓度的硼替佐米和西拉美新处理MM细胞,CCK-8法检测细胞增殖,实时定量PCR和Western blot法检测TFEB、自噬相关因子LC3B、Beclin1、p62、LAMP1的mRNA和蛋白相对表达量。 结果 随着硼替佐米浓度增加及作用时间延长,两个细胞系的增殖抑制率增高( P<0.05)。硼替佐米和西拉美新联用对上述MM细胞株的增殖有协同抑制作用( P<0.05)。空白对照组、单药组、联合用药组处理MM细胞株后,细胞质中TFEB的mRNA和蛋白相对表达量依次下降( P<0.05),细胞核中TFEB的mRNA和蛋白相对表达量依次上升( P<0.05),自噬相关因子LC3B、Beclin1、LAMP1的mRNA和蛋白相对表达量依次上升,p62的mRNA和蛋白相对表达量依次下降( P<0.05)。 结论 硼替佐米和西拉美新具有协同抑制MM细胞增殖作用,与其诱导MM细胞株自噬表达增强相关,发生核转位的TFEB表达亦增强。 相似文献
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Xiao-Huang Xu Yu-Chi Chen Yu-Lian Xu Zhe-Ling Feng Qian-Yu Liu Xia Guo Li-Gen Lin Jin-Jian Lu 《World Journal of Traditional Chinese Medicine》2021,(2)
Background: High proliferative rate of cancer cells requires autophagy to maintain nutrient supply and intracellular homeostasis. As a result, impairing autophagic flux could be a novel strategy of cancer therapy. Aims and Objectives: In this study, the mechanism of a xanthone derivative isolated from Garcinia mangostana, garcinone E(GE), was investigated. Materials and Methods: Fluorescence assay was used to observe the accumulation and location of autophagosome and lysosome. Flow cytometry with Lyso-tracker red, MDC, and AO staining were applied to evaluate the lysosome accumulation and cellular acidity. Western blot and RT-qPCR were performed to evaluate the protein and mRNA levels, respectively. Results: GE could cause enhancement of LC3 II and p62 and the accumulation of autophagosome and lysosome. Meanwhile, it limited the protein level of Rab7, increased lysosomal pH, and inhibited the maturation of lysosomal hydrolases such as Cathepsin L, therefore blockaded the fusion of autophagosome and lysosome. Moreover, GE acted as a TFEB modulator by downregulating its protein level, which might contribute to autophagy dysfunction in ovarian cancer cells. Conclusions: GE interfered autophagosome–lysosome fusion in cancer cells, which demonstrated its application as an autophagy regulator and a potential therapeutic agent. 相似文献
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