吉非替尼对斑马鱼胚胎发育及肿瘤耐药基因表达的影响

摘要

Objective To investigate the effects of gefitinib on early embryonic development and expression of abcb4 tumor resistance genes in zebrafish.Methods Zebrafish were adopted as experimental animals and divided into gefitinib group,mixture of doxorubicin and gefitinib group and blank group.Zebrafish embryos of 0.5-1.5 hours after fertilization(0.5-1.5 hpf) were exposed to different concentrations of gefitinib,and then embryo development of zebrafish in 24-120 hpf was observed and the number of death,hatch and malformation was recorded.The embryo mortality was calculated under different concentrations of gefitinib at different time points,and the numerical value of IC50 was calculated;Hatching rates of zebrafish embryo in 48 hpf and 72 hpf and malformation rates of zebrafish embryo in 120 hpf were calculated.The zebrafish embryos exposed to different concentrations of gefitinib in different groups were collected,and the expressionof abcb4 gene in zebrafish embryos was detected by real-time quantitative PCR.Results Gefitinib IC50 in zebrafish embryos was 16.18 μmol/L.Compared with the control group,higher dosage (20 μmol/L) of gefitinib in other two groups significantly decreased hatching rates of embryos,and had obvious embryonic lethal effects and teratogenic effects.Moreover,the mRNA levels of the abcb4 gene in the zebrafish embryos of gefitinib group were not significantly changed,whereas the mRNA levels of the abcb4 gene in mixture of doxorubicin and gefitinib group were significantly different(P＜0.05).Conclusion Gefitinib has no significant effects on the expression of abcb4 tumor resistance gene in early development of zebrafish embryos(P＞0.05),but it can reverse the drug resistant effects of doxorubicin,suggesting that zebrafish can construct tumor resistance model.%目的 研究吉非替尼对斑马鱼早期胚胎发育及abcb4肿瘤耐药基因表达的影响.方法 实验动物采用斑马鱼,实验分为吉非替尼组、阿霉素和吉非替尼的混合液组、空白对照组.将吉非替尼稀释成不同浓度梯度的药液,分别处理受精后0.5～1.5 h(0.5～1.5 hpf)的斑马鱼胚胎,观察胚胎和幼鱼的死亡率、孵化率及畸形率变化.统计各浓度不同时间点的胚胎死亡率,计算出IC50的数值;统计48 hpf和72 hpf的胚胎孵化率及120 hpf的畸形率;收集不同组别的斑马鱼胚胎,通过实时荧光定量PCR,检测斑马鱼胚胎中abcb4基因的表达量.结果 计算出吉非替尼在斑马鱼胚胎中的IC50为16.18 μmol/L.与对照组比较,高剂量吉非替尼(≥20 μmol/L)显著抑制胚胎的孵化,并有明显的胚胎致死效应和致畸效应;吉非替尼组的斑马鱼胚胎abcb4基因的mRNA水平变化不显著,而阿霉素和吉非替尼的混合液组的abcb4基因的mRNA水平有明显变化(P＜0.05).结论 吉非替尼对斑马鱼早期胚胎中abcb4肿瘤耐药基因的表达水平无明显影响(P＞0.05),但是吉非替尼能逆转易耐药药物阿霉素的耐药作用,提示使用斑马鱼可以构建肿瘤耐药模型.