Pure Total Flavonoids from Citrus paradisi Macfad InduceLeukemia Cell Apoptosis In Vitro

Objective: To investigate the potential effect of pure total flavonoids from Citrus paradisi Macfad peel(PTFC) on the proliferation and apoptosis of human myeloid leukemia cells Kasumi-1, HL-60 and K562, and the underlying mechanisms. Methods: PTFC was extracted from Citrus paradisi Macfad peel and was identified by high performance liquid chromatography. The effect of PTFC on the proliferation and apoptosis of leukemia cells were determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide, fluorescent microscopy and flow cytometry, respectively. The effect of PTFC on the expression levels of apoptosis-related regulators was determined by Western blot assay. Results: Treatment with PTFC inhibited leukemia cell proliferation in a dose-and time-dependent manner and triggered Kasumi-1 cell apoptosis. Treatment with PTFC significantly increased the levels of activated poly adenosine diphosphate-ribosepolymerase and caspase-3/-9, but reduced the levels of Mcl-1 expression in Kasumi-1 cells. However, PTFC did not obviously induce HL-60 cell apoptosis. Conclusion: PTFC inhibited leukemia cell proliferation and induced their apoptosis by modulating apoptosisrelated regulator expression in leukemia cells in vitro.     

胡柚皮黄酮诱导自噬抑制肝细胞脂肪变性的作用研究

目的 观察胡柚皮黄酮对棕榈酸诱导的肝细胞脂肪变性的影响。方法 棕榈酸诱导HepG2细胞脂肪变性，不同浓度胡柚皮黄酮干预后，采用油红O染色法观察肝细胞脂肪变性；荧光探针法观测细胞内活性氧水平及线粒体膜电位变化；免疫印迹法检测Beclin-1、LC3及P62蛋白表达。结果 棕榈酸诱导后，HepG2细胞内脂滴和活性氧含量明显增高；胡柚皮黄酮处理后，细胞内脂滴和活性氧均明显降低，线粒体膜电位恢复，LC3和Beclin-1蛋白表达上调，P62蛋白表达下调。结论 胡柚皮黄酮能改善肝细胞脂肪变性和氧化应激反应，机制可能与其调控线粒体自噬，维持线粒体功能稳定有关。     

重组人白细胞介素-2对白血病患者NK细胞活性的体外调节作用

~(125)I释放法测定42例正常人和36例白血病患者外周血的自然杀伤(NK)细胞活性。结果:初发期患者 7.1±4.0%,缓解期33.6±7.6%,均明显低于正常人57.7±12.3%。用重组人白细胞介素—2(rIL—2)培养外周血单个核细胞(PBMNC)后,可使缓解期患者NK细胞活性恢复到正常水下(60%),但不能使初发期和复发期NK细胞活性(27%)恢复正常。     

复合螺旋藻多糖对人乳腺癌MB-231细胞株体外抗肿瘤作用研究

目的:研究复合螺旋藻多糖对体外培养的人乳腺癌MB-231肿瘤细胞的抑制作用及可能的作用机制。方法:以人乳腺癌MB-231细胞株为研究对象,将螺旋藻多糖(PSP)与银杏叶提取物(GBE)按不同比例复合,并用不同浓度的复合制剂分别对细胞作用后,分别在48h、72h后,显微镜下观察细胞形态学变化,MTT法测其生长抑制率。48h后,PI及AnnexinV-FITC/PI染色,用流式细胞仪测其细胞周期及凋亡率。结果:复合螺旋藻多糖对人乳腺癌MB-231细胞均有不同程度的抑制作用,复合组优于单一成分组,抑制生长效果与时间和剂量呈依赖关系;将人乳腺癌MB-231细胞阻滞于G0/G1期,抑制肿瘤细胞的有丝分裂;促进肿瘤细胞凋亡,与空白组相比差异显著。结论:复合螺旋藻多糖通过阻断细胞周期达到抑制体外培养的人乳腺癌MB-231细胞的生长的目的,具有较好的抗肿瘤活性。     

反义BCR/ABL寡核苷酸体外抑制K562细胞的研究

目的：探讨反义ＢＣＲ和ＡＢＬ融合基因（ＢＣＲ／ＡＢＬ融合基因）寡核苷酸体外抑制Ｋ５６２细胞的作用及机制。方法：采用Ｋ５６２细胞培养,观察反义ＢＣＲ／ＡＢＬ寡核苷酸体外对Ｋ５６２细胞数、台盼蓝拒染率及克隆形成等的影响。结果：经反义ＢＣＲ／ＡＢＬ寡核苷酸ｂ３ａ２（ＡＳｂ３ａ２）处理后培养８ｄ的Ｋ５６２克隆抑制率达６０６９％,液体培养中细胞数从２４ｈ开始较对照组减少,细胞存活率从８ｈ开始即较对照组明显下降,ＢＣＲ／ＡＢＬ寡核苷酸ｂ２ａ２（ＡＳｂ２ａ２）及无义寡核苷酸对Ｋ５６２细胞数和存活率无明显影响;３种寡核苷酸对ＨＬ６０细胞数和存活率也无影响。结论：ＡＳｂ３ａ２对Ｋ５６２细胞有序列特异性的抑制作用。ＡＳｂ３ａ２的这种抑制作用可能在于它诱导Ｋ５６２细胞的凋亡。