Objective To investigate the effect of multidrug resistance gene 1 (mdr1) antisense oligodeoxynucleotides (ODNs) on reversing multidrug resistance in the drug resistant ovarian carcinoma cell line SKOV3/mdr1. Methods...
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Objective To investigate the effect of multidrug resistance gene 1 (mdr1) antisense oligodeoxynucleotides (ODNs) on reversing multidrug resistance in the drug resistant ovarian carcinoma cell line SKOV3/mdr1. Methods The ovarian carcinoma cell line SKOV3 transducted with a human multidrug resistance gene (mdr1) served as the drug resistant model (SKOV3/mdr1). The mdr1 antisense ODNs was transfected into SKOV3/mdr1 cells while mediated by lipofectamine. Reverse transcription-polymerase chain reaction (RT-PCR) was used to measure the expression and the amount of the mdr1 mRNA in the cells. The positive rate and function of the mdr1 gene product P-glycoprotein (Pgp) in the mdr1 antisense ODNs treated SKOV3/mdr1 cells were determined by flow cytometry and rhodamine 123 efflux. Drug resistance in the SKOV3/mdr1 cell line was observed by MTT assay and cell colony culture. Results The mdr1 mRNA level was decreased to about 60% of that of β-actin after mdr1 antisense ODNs treatment. The Pgp positive rate of mdr1 antisense ODNs treated SKOV3/mdr1 cells decreased from 100% to 52.6% (P<0.01). The intracellular rhodamine 123 retention was increased from 9.1% to 33.8% (P<0.01). The chemoresistance to taxol decreased to 58% of SKOV3/mdr1 with mdr1 antisense ODN treatment. Compared with SKOV3/mdr1 cells in the control group, under a certain range of drug concentrations, the number of drug resistance colonies in mdr1 antisense ODNs treated SKOV3/mdr1 cells for taxol and doxorubicin decreased by 8.6±0.8 fold and 3.1±0.6 fold, respectively. Some non-specific functions during oligodeoxyncleotide treatment was also detected. Conclusion mdr1 expression in the SKOV1/mdr1 cell line was partially inhibited after mdr1 antisense ODNs treatment at the mRNA and protein level, increasing the chemotherapy sensitivity of this drug resistant ovarian carcinoma cell line.
目的:观察补肾活血方对脑缺血小鼠学习记忆能力及大脑皮层胆碱乙酰化转移酶(ChAT)、胆碱能 M 受体(MR)和 N 受体(NR)活性的影响。方法:用双侧颈总动脉结扎缺血再灌术,建立小鼠脑缺血智能障碍模型。分别灌胃生理盐水(假手术组、缺血模型...
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目的:观察补肾活血方对脑缺血小鼠学习记忆能力及大脑皮层胆碱乙酰化转移酶(ChAT)、胆碱能 M 受体(MR)和 N 受体(NR)活性的影响。方法:用双侧颈总动脉结扎缺血再灌术,建立小鼠脑缺血智能障碍模型。分别灌胃生理盐水(假手术组、缺血模型组)、补肾活血方(防治组、治疗组)和尼莫地平(阳性对照组),观察了小鼠被动回避反应学习记忆能力、大脑皮层 ChAT、MR 和 NR 活性的变化。结果:与缺血模型组比较,补肾活血方能显著提高模型小鼠学习记忆能力(P<0.01),明显提高大脑皮层中的 ChAT、MR、NR 活性(P<0.05,P<0.01),与尼莫地平作用相近。结论:补肾活血方有改善脑缺血小鼠学习记忆能力、增加小鼠大脑皮层 ChAT、MR 和 NR 活性的作用,对脑缺血有保护作用。
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